CN113320062B - Manufacturing method of cold stamping die pressing plate with flexible pressing function - Google Patents
Manufacturing method of cold stamping die pressing plate with flexible pressing function Download PDFInfo
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- CN113320062B CN113320062B CN202110555322.2A CN202110555322A CN113320062B CN 113320062 B CN113320062 B CN 113320062B CN 202110555322 A CN202110555322 A CN 202110555322A CN 113320062 B CN113320062 B CN 113320062B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000007723 die pressing method Methods 0.000 title claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 109
- 239000006260 foam Substances 0.000 claims abstract description 98
- 229920005989 resin Polymers 0.000 claims abstract description 96
- 239000011347 resin Substances 0.000 claims abstract description 96
- 239000000806 elastomer Substances 0.000 claims abstract description 54
- 229920001971 elastomer Polymers 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 50
- 230000008569 process Effects 0.000 claims abstract description 24
- 238000003754 machining Methods 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 12
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 238000005266 casting Methods 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 18
- 238000010125 resin casting Methods 0.000 claims description 17
- 239000004033 plastic Substances 0.000 claims description 11
- 229920003023 plastic Polymers 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- 238000004040 coloring Methods 0.000 claims description 8
- 230000001680 brushing effect Effects 0.000 claims description 7
- 239000003822 epoxy resin Substances 0.000 claims description 7
- 229920000647 polyepoxide Polymers 0.000 claims description 7
- 239000013524 weatherproof sealant Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
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- 238000011049 filling Methods 0.000 claims description 4
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/06—Platens or press rams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C39/12—Making multilayered or multicoloured articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/24—Feeding the material into the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/42—Casting under special conditions, e.g. vacuum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/44—Measuring, controlling or regulating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to a manufacturing method of a cold stamping die pressing plate with a flexible pressing function, which comprises the steps of structural design of the pressing plate, numerical control machining of a foam cavity, pre-machining of a structural surface, phosphating of the pre-machined structural surface, pre-burying of anti-falling screws of the structural surface, hardening of the surface of the foam cavity, opening a pouring system for inflow of an elastomer resin material on the foam cavity, sealing and fixing the foam cavity and the structural surface, stirring and vacuum defoaming of the elastomer material, pouring and curing of the elastomer resin material, removal of the foam cavity, numerical control machining, assembly and debugging. The manufacturing method of the cold stamping die pressing plate with the flexible pressing function can greatly improve the surface quality and the part size of the part produced by the die in the stamping process, is stable and reliable, reduces the labor intensity of workers, reduces the cost and improves the production efficiency.
Description
Technical Field
The invention belongs to the technical field of cold stamping dies, and particularly relates to a manufacturing method of a cold stamping die pressing plate with a flexible pressing function.
Background
The metal pressing mode is a main stream mode of die pressing at the present stage, but through use and verification for many years, the existing functions of the traditional pressing mode are weakened by the increasingly improved quality and production efficiency requirements. In the production and debugging processes, the defects of crush injury, poor coloring and the like are also amplified.
Aiming at the defects, at present, domestic mould manufacturers generally adopt a grinding mode to ensure the influence of a pressing plate on the coloring, the size and the flour products of the products. However, the problems of high labor intensity, high processing cost, long debugging period and difficult guarantee of coloring, size and flour products are also existed.
Disclosure of Invention
The invention provides a manufacturing method of a cold stamping die pressing plate with a flexible pressing function, which aims to solve the problems that the labor intensity is high, the processing cost is high, the debugging period is long, and the quality of coloring, size and flour products cannot be ensured in the manufacturing of the pressing plate in a grinding and matching mode.
The invention aims at realizing the following technical scheme:
a manufacturing method of a cold stamping die pressing plate with a flexible pressing function comprises the following steps:
A. and (3) structural design of a material pressing plate: the material pressing plate consists of a working molded surface and a structural surface 2, wherein the working molded surface takes the structural surface as a reference, the size of a hollow area in a cavity of the working molded surface is limited, the wall thickness of the cavity is 50mm, the edge of the cavity completely wraps the structural surface, the side gap between the working molded surface and the structural surface 2 is 2mm to 4mm, and a plurality of threaded holes are uniformly distributed on the structural surface 2;
B. numerical control machining of the foam cavity 1: selecting a whole foam plastic with a slightly larger design size as a blank material for processing the cavity, and adopting a numerical control machine tool to process the foam plastic to obtain a foam cavity 1 material object with the design size for standby;
C. preprocessing a structural surface 2: the base of the material pressing plate, namely the structural surface, is manufactured by adopting polystyrene foam casting;
D. phosphating the prefabricated structural surface 2: firstly removing greasy dirt attached to the structural surface 2 by using an organic solvent, repeatedly brushing a proper amount of 4 in 1 phosphating solution on the structural surface 2 by using a brush after the solvent volatilizes, further removing the greasy dirt remained in the deep part of the casting, and forming a phosphating film on the processing surface;
E. structural surface pre-buried anti-drop screw: installing countersunk screws on the structural surface 2, and hooking an elastomer resin material for pressing by utilizing the dovetail heads exposed out of the countersunk screws;
F. surface hardening treatment of the foam cavity: b, coating epoxy resin or unsaturated resin on the surface of the foam cavity 1 prepared in the step B;
G. a pouring system for inflow of elastomer resin materials is arranged on the foam cavity 1, and the pouring system comprises a resin casting head and an exhaust pipe;
H. sealing and fixing the foam cavity 1 and the structural surface 2;
I. stirring and vacuum defoaming of an elastomer material: respectively weighing the multi-element resin materials according to the formula, pouring the multi-element resin materials into a stirrer for fully stirring and mixing, and then placing the mixed materials into a vacuum tank for vacuumizing and defoaming for 5 minutes, and taking out for later use;
J. and (3) pouring and curing an elastomer resin material: pouring an elastomer resin material into the foam cavity 1 to form a flexible blank of a flexible pressing plate by curing, wherein the pouring time of the elastomer resin material is 10-13 minutes, the ambient temperature is 20-26 ℃, pouring of a pouring hole 4 of a resin pouring head at the lowest position of a die cavity is started when pouring is performed, the liquid level of the resin is gradually lifted from low to high, the resin pouring is stopped when the liquid level of the pouring hole 4 at the highest position or an exhaust hole 5 of an exhaust pipe exceeds 5CM of the upper surface of the foam cavity 1, and the resin is cured for 140-160 hours at the room temperature of 20 ℃, and is cured for 4-8 hours at the temperature of 80 ℃;
K. removal of foam cavity 1: after the poured elastomer resin is completely cured, removing the pouring system, and removing the foam cavity 1 and the weather-proof sealant to prepare a blank of the blank pressing plate;
l, numerical control machining: adopting a numerical control machine tool to carry out numerical control processing to obtain a complete pressing plate which is consistent with the earlier design;
m, assembling and debugging: and D, assembling the integral pressing plate obtained in the step L into an upper bottom plate, statically inspecting, then closing the mold, and performing press upper debugging after closing the mold, and producing after debugging.
Further, in the step A, the size of the cavity edge wrapping structural surface is 30mm.
Further, in the step A, the distance between each threaded hole is 25mm-30mm.
Further, in the step E, the length of the countersunk head screw is 16mm, and the screwing depth is 10mm.
Further, in the step F, for the large foam cavity, on the basis of brushing epoxy resin or unsaturated resin on the surface of the foam cavity 1, glass fiber reinforced plastic materials are adopted for reinforcement.
Further, the resin casting head is used for guiding elastomer resin into the foam cavity 1, and the resin casting head is fixed on the foam cavity 1 by adopting weather-proof glue; the exhaust pipe is arranged at the high and narrow positions of the foam cavity 1 and is used for observing the flowing filling condition of the elastomer resin material, removing residual gas in the cavity and ensuring that the elastomer resin can be fully filled at each position of the cavity.
Furthermore, the resin casting heads are made of hard PVC pipes, the diameters of the resin casting heads are selected between 30mm and 50mm according to the volumes of the cavities and the molds, the resin casting heads are distributed on the foam cavity 1 at the position not lower than 5 per square meter or distributed at the joint of the rib plate of the pressing surface, and the opening heights of all casting systems are basically flush; the exhaust pipe 5 is made of 10-12mm transparent PVC pipe.
Further, in the step H, the fixing mode is bonding, pouring, screw connection or embedding.
And (C) removing the pouring system by adopting a manual sawing mode of a metal saw, and removing the foam cavity 1 and the weather-resistant sealant by adopting a flat shovel.
Further, in step M, the debugging process is as follows: the coloring state meeting the use requirement is obtained by adjusting the height of the balance weight on the material pressing plate.
Compared with the prior art, the invention has the beneficial effects that:
the manufacturing method of the cold stamping die pressing plate with the flexible pressing function, disclosed by the invention, has the advantages that the pressing plate with the flexible pressing function, which is manufactured by utilizing the elastic resin material, can be applied to the cold stamping die, the pressing function can be realized in the stamping process, the grinding or small amount of grinding of the pressing device can be reduced, the size and the flour product of a workpiece can be improved, the efficiency can be improved, the cost can be reduced, the surface quality and the size of the part produced by the die can be greatly improved in the stamping process, the stability and the reliability are realized, the labor intensity of workers is reduced, the cost is reduced, and the production efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1-3 are exploded views of a cold stamping die blank holder with flexible blanking function;
FIG. 4 is a schematic diagram of a casting system;
FIG. 5 is a block diagram of a cold stamping die blank holder with flexible blanking function;
FIG. 6 is a rear left side view of FIG. 5;
fig. 7 is a side view of fig. 5.
In the figure, 1, a foam cavity 2, a structural surface 3, a fixing position 4, a pouring hole 5 and an exhaust hole.
Detailed Description
The invention is further illustrated by the following examples:
the invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
As shown in fig. 1 to 7, the manufacturing method of the cold stamping die pressing plate with the flexible pressing function comprises the following steps:
A. and (3) structural design of a material pressing plate: the material pressing plate is composed of a working molded surface and a structural surface 2, wherein the working molded surface uses the structural surface 2 as a reference, the size of a hollow area in a cavity of the working molded surface is limited, the wall thickness of the cavity is 50mm, the edge of the cavity completely wraps the structural surface 2, and the size of the edge of the cavity wraps the structural surface 2 is 30mm. The clearance between the working surface and the side surface of the structural surface 2 is 2mm to 4mm, a plurality of threaded holes are uniformly distributed on the structural surface 2, and the distance between each threaded hole is 25mm to 30mm;
B. numerical control machining of the foam cavity 1: selecting a whole foam plastic with a slightly larger design size as a blank material for processing the cavity, and adopting a numerical control machine tool to process the foam plastic to obtain a foam cavity 1 material object with the design size for standby;
C. preprocessing a structural surface 2: the base of the material pressing plate, namely the structural surface, is manufactured by adopting polystyrene foam casting;
D. phosphating the prefabricated structural surface 2: firstly removing greasy dirt attached to the structural surface 2 by using an organic solvent, repeatedly brushing a proper amount of 4 in 1 phosphating solution on the structural surface 2 by using a brush after the solvent volatilizes, further removing the greasy dirt remained in the deep part of the casting, and forming a phosphating film on the processing surface;
E. the structural surface 2 is embedded with anti-falling screws: installing countersunk screws on the structural surface 2, and hooking an elastomer resin material for pressing by utilizing the dovetail heads exposed out of the countersunk screws, wherein the countersunk screws are 16mm in length and 10mm in screwing depth;
F. surface hardening treatment of the foam cavity 1: b, coating epoxy resin or unsaturated resin on the surface of the foam cavity 1 prepared in the step B; for the large foam cavity 1, on the basis of brushing epoxy resin or unsaturated resin on the surface of the foam cavity 1, the foam cavity 1 is further reinforced by adopting a glass fiber reinforced plastic material;
G. a pouring system for inflow of elastomer resin materials is arranged on the foam cavity; the pouring system comprises a resin casting head and an exhaust pipe, wherein the resin casting head is used for guiding elastomer resin into the foam cavity 1, and the resin casting head is fixed on the foam cavity 1 by weather-resistant glue; the exhaust system is arranged at the high and narrow positions of the foam cavity 1 and is used for observing the flowing filling condition of the elastomer resin material, removing residual gas in the cavity and ensuring that the elastomer resin can be fully filled in each position of the cavity;
specifically: the resin casting heads are made of hard PVC pipes, the diameters are selected between 30mm and 50mm according to the volumes of the cavity and the die, and the resin casting heads are distributed on the foam cavity 1 at the position not lower than 5 per square meter or distributed at the joint of the rib plate of the material pressing surface, so that the opening heights of all casting systems are basically flush; the exhaust pipe is made of a 10-12mm transparent PVC pipe.
H. Sealing and fixing the foam cavity 1 and the structural surface 2; the fixing mode is bonding, pouring, screw connection or embedding;
I. stirring and vacuum defoaming of an elastomer material: respectively weighing the multi-element resin materials according to the formula, pouring the multi-element resin materials into a stirrer for fully stirring and mixing, and then placing the mixed materials into a vacuum tank for vacuumizing and defoaming for 5 minutes, and taking out for later use;
J. and (3) pouring and curing an elastomer resin material: pouring an elastomer resin material into the foam cavity 1 to form a flexible blank of a flexible pressing plate by curing, wherein the pouring time of the elastomer resin material is 10-13 minutes, the ambient temperature is 20-26 ℃, pouring of a pouring hole 4 of a resin pouring head at the lowest position of a die cavity is started when pouring is performed, the liquid level of the resin is gradually lifted from low to high, the resin pouring is stopped when the liquid level of the pouring hole 4 at the highest position or an exhaust hole 5 of an exhaust pipe exceeds 5CM of the upper surface of the foam cavity, the resin is cured for 140-160 hours at the room temperature of 20 ℃, and the resin is cured for 4-8 hours at the temperature of 80 ℃;
K. removal of foam cavity 1: after the poured elastomer resin is completely cured, removing the pouring system, and removing the foam cavity 1 and the weather-proof sealant to prepare a blank of the blank pressing plate; the method comprises the following steps: and removing the pouring system by adopting a manual sawing mode of a metal saw, and removing the foam cavity 1 and the weather-proof sealant by adopting a flat shovel.
L, numerical control machining: adopting a numerical control machine tool to carry out numerical control processing to obtain a complete pressing plate which is consistent with the earlier design;
m, assembling and debugging: and D, assembling the integral pressing plate obtained in the step L into an upper bottom plate, statically inspecting, then closing the mold, and performing press upper debugging after closing the mold, and producing after debugging. The debugging process comprises the following steps: the coloring state meeting the use requirement is obtained by adjusting the height of the balance weight on the material pressing plate.
Examples
1. And (5) carrying out data model design by taking the molded surface of the metal pressing plate as a design reference.
2. And the conventional metal pressing plate is split into a working surface and a structural surface through drawing software. The relation between the working profile and the structural profile 2 is: the working surface is attached to the structural surface and is directly contacted with the plate material in the working process, so that the pressing effect is achieved. The structural surface 2 is provided with a metal base below the working surface and has the functions of supporting, connecting and fixing the working surface. The outer surface of the working molded surface obtained by the drawing disassembly is the same as the molded surface of the metal pressing plate (namely, the prior metal pressing plate is molded, and the drawing disassembly can be performed and is equivalent to 'original edition data' in the design process).
3. After the drawing is disassembled, the working molded surface is subjected to cavity design: the working profile is designed into a cavity through diagramming software such as CATIA, UG and the like, the working profile is firstly required to be ensured to be in a hollow state (the principle is the same as that of a mineral water bottle), pouring can be performed only in the hollow state, and the fluidity of liquid materials in the pouring process of the subsequent working procedure is ensured. In order to ensure that the blank size with the machining conditions is obtained after pouring, the size of a hollow area in a cavity is limited, the structural surface 2 is taken as a reference, and the space of the cavity area is increased by 20mm on the basis of accommodating the working molded surface, so that the machining allowance after pouring is finished. The wall thickness of the cavity needs to be ensured to be about 50mm, the edge of the cavity needs to be completely wrapped with the structural surface 2, and the wall thickness is generally wrapped by 30mm, so that the sealing and the bonding of the subsequent process are facilitated. The cavity is designed and manufactured to obtain a workblank of the working profile during the casting process.
4. Structural plane 2 design: the structural surface 2 mainly plays roles in supporting, connecting and fixing the working surface. When designing, the designed cavity is taken as a reference, so that the cavity can wrap the structural surface, and the side gap between the cavity and the structural surface is ensured to be between 2mm and 4 mm. In the profile part of the structural surface, M5 threaded holes are designed, each threaded hole is about 25mm-30mm apart, and the threaded holes are uniformly distributed in the structural surface 2 to prepare for the subsequent embedded screws.
5. Numerical control machining of the foam cavity 1: and writing a numerical control machining program according to the designed cavity mathematical model, and converting the numerical control machining program into NC codes for numerical control machining. And (3) selecting a whole foam plastic with a size slightly larger than the design size as a blank material for processing the cavity, running an NC code program, and processing the foam plastic by using a numerical control machine tool to obtain a foam cavity 1 material object with the design size for standby.
6. Preprocessing a structural surface: the metal base of the material pressing plate is obtained by casting polystyrene foam, the structural surface of the metal base shows a cast metal form, and two main disadvantages exist in use: the dimensional deviation of the casting molding surface is large, so that tight combination of the foam cavity 1 and the structural surface 2 of the foam cavity cannot be ensured, and the sealing of the foam cavity 1 and the material pressing structural surface is not facilitated. The impurity ash content in the as-cast surface metal is high, which is unfavorable for the effective adhesion of the elastomer resin material and the metal surface.
The processing of the structural surface 2 is similar to that of a foam cavity, the only difference being that the foam cavity 1 is of non-metallic material and the structural surface 2 is of metallic material.
7. Phosphating the prefabricated structural surface 2: because the machine tool cooling liquid is usually used in the numerical control machining process, the main component of the machine tool cooling liquid is mineral grease, and in addition, the oil leakage of part of the machine tool is caused, the machined structural surface 2 is polluted by oil stains, and at the moment, the elastic body resin material can be fully adhered to the structural surface 2 only by effectively removing the oil stains. The process mainly comprises the following steps of; removing a large amount of greasy dirt attached to the structural surface by using an organic solvent, repeatedly brushing the structural surface with a proper amount of 4 in 1 phosphating solution by using a brush after the solvent volatilizes, further removing the residual greasy dirt on the deep part of the casting, and forming a phosphating film on the processing surface to achieve the purpose of priming the adhesive elastomer resin material.
8. Structural surface pre-buried anti-drop screw: the flexible pressure plate always works in a dynamic environment, only the elastic resin material is adhered to the structural surface of the pressure plate, the risk of detachment from the adhesive surface is relatively high under the action of external force, the connection strength of the elastic resin material and the structural surface of the pressure plate is increased by adopting a method of installing countersunk screws on the structural surface of a die, the screw length of the M5 x 16 countersunk screws (the strength of the standard GB/T819.1 is above 8.8 level) is 16mm, the screwing depth is 10mm, and the screws are adhered by adopting threaded anaerobic adhesive during screwing. The elastic resin material for pressing is hooked by the dovetail head exposed by the countersunk head screw, so as to achieve the purpose of increasing the firmness.
9. Surface hardening treatment of the foam cavity 1 which is finished by numerical control processing cannot be put into use, and the main reason is that the strength of the cavity of the foam material is too low to meet the use requirement, and the strength of the foam cavity needs to be improved by a surface hardening mode. The concrete method comprises the steps of brushing epoxy resin or unsaturated resin on the surface of the foam cavity to increase the hardness and strength, and reinforcing the large foam cavity 1 by adopting glass fiber reinforced plastic materials.
The surface hardening treatment of the foam cavity 1 is also beneficial to the adhesion and sealing between the cavity and the structural surface of the die in the later stage.
10. A pouring exhaust system is arranged on the foam cavity 1: the core component of the flexible pressing plate is a flexible pressing surface, and the material is an elastomer resin material which has better fluidity in the initial stage, can be gradually solidified along with the change of time and temperature after being mixed and finally meets the requirement of pressing hardness. The introduction of the material into the foam cavity to form a working profile blank on the mould requires the provision of a casting system in the foam cavity 1 into which the elastomeric resin material flows. The system includes;
resin casting head: the main effects include the introduction of the elastomeric resin into the foam cavity 1, and the compensation of shrinkage during progressive curing of the elastomeric resin. The casting head is generally made of hard PVC pipe, the diameter of the casting head is selected between 30mm and 50mm according to the volumes of the cavity and the die, and the casting head is fixed on the foam cavity by weather-resistant glue. The distribution is carried out at the position not lower than 5 per square meter or at the joint of the rib plate of the material pressing surface, so that the opening heights of all pouring systems are basically flush.
An exhaust system: the foam cavity 1 is mainly arranged at the high and narrow positions of the structure, is generally made of 10-12mm transparent PVC pipes, is used for observing the flowing filling condition of the elastomer resin material, and is used for removing residual gas in the cavity, so that the elastomer resin can be fully filled at each position of the cavity.
11. The foam cavity 1 is bonded and sealed with the die structural surface 2: another key factor in whether the elastomeric resin material can be filled separately into each of the foam cavities 1 is the problem of the adhesive seal between the foam cavities and the structural face of the mold. In addition to the sealing problem which is fully considered in the design stage of the foam cavity 1, sealant with better performance is selected for sealing in the manufacturing process. Currently, a sealing gum with a weather-resistant structure of dakangning 995 is adopted.
12. Elastomer resin material selection, namely the elastomer resin material is one of the most core parts in the patent, and the flexible material pressing function of the material pressing plate can be realized only by correctly selecting the elastomer resin material. Firstly, the materials have multiple properties, have better fluidity in the initial stage of independent storage and mixing, have the performance of gradual solidification under a certain temperature condition after the materials are fully mixed, and can meet the hardness requirement and the elasticity requirement of the flexible pressing material after complete solidification. Currently, elastomeric resin materials capable of meeting the above requirements include, see table 1:
TABLE 1
13. Stirring and vacuum defoaming of an elastomer material: the materials are all multielement materials, and the multielement materials can be poured into the foam cavity 1 after being mixed accurately and stirred sufficiently to be solidified into a flexible blank of the flexible pressing plate. However, these materials have a considerable amount of air mixed therein during the stirring process, and if not removed in time, numerous pin-hole honeycomb structures are formed inside the cured blank, which reduce the hardness of the elastomer resin material and provide excellent habitat for the mold to retain greasy dirt and dust on its surface during later use. In order to overcome the problems, the material is also required to be added with a vacuum defoaming link in the stirring process; the method comprises the specific steps of weighing the multi-element resin materials according to the formula, pouring the multi-element resin materials into a stirrer for fully stirring and mixing, and then placing the mixed materials into a vacuum tank for vacuumizing and defoaming for 5 minutes, and taking out for standby. The whole operation time of pouring the elastomer resin material is about 20 minutes, the total time consumed in the stirring and defoaming process cannot exceed 7 minutes, the defoaming time is properly shortened when the air temperature is high in summer, and more sufficient time is left for subsequent resin pouring.
14. And (3) pouring and curing an elastomer resin material: the casting time of the elastomer resin material is controlled within 10-13 minutes, and the ambient temperature is controlled between 20-26 ℃, so that the environment temperature is too high, the casting time is too long, which means that the fluidity of the resin is reduced, even the resin is initially set, and once the initial setting phenomenon of the elastomer resin material occurs, the elastomer resin material is very likely to be not fully filled into all spaces of a foam cavity, so that blank shortage is caused, and the later repair is needed. When the elastomer resin material is poured, the pouring is started at the intersection of the lowest positions of the die cavities, so that the resin liquid level is gradually lifted from low to high, and the biggest benefit of the operation is that the air in the die cavities can be fully discharged, and the resin material is ensured to fully fill the die cavities. In the resin pouring process, the liquid level lifting condition of each riser is required to be observed continuously, the resin pouring can be stopped when the liquid level of the riser or the vent at the highest position exceeds the upper surface 5CM of the foam cavity, and the sealing between the foam cavity and the structural surface of the die is not facilitated due to the fact that the pressure is increased continuously due to the fact that the liquid level of the resin is raised excessively. The elastomer resin material needs a curing temperature and time from initial setting to complete curing, the curing temperature is inversely proportional to the curing time within a certain range, the curing time is about 140-160 hours at the room temperature of 20 ℃, and the elastomer resin material can be completely cured after 4-8 hours at the temperature of 80 ℃.
15. Removal of foam cavity 1: the foam cavity 1 can be removed after the elastomer resin for pouring is completely cured, the pouring and exhaust system is firstly removed in the process, the foam cavity 1 and weather-proof sealant can be removed by adopting a metal saw to manually saw, and then the sealant is removed by adopting tools such as a flat shovel, so that the sealant is required to be removed completely, otherwise, the processing is affected. And after the substances are completely removed, the blank of the die pressing plate with the flexible pressing function is manufactured, and the die pressing plate can be transferred to a numerical control machining link.
16. Numerical control machining: after the pouring process, the working profile is processed by using the programmed processing program. The final product is obtained in accordance with the previous design.
17. Assembly/debugging method: and (3) carrying out static assembly on the manufactured flexible pressing plate, wherein the assembly method and process are the same as those of the common pressing plate. And (5) after the assembly is completed, closing the die and loading the die into a press machine, and dynamically debugging. The debugging method is slightly different from the common pressing plate. Because the working molded surface of the flexible material pressing plate has elasticity, large-area grinding and matching are not needed in the debugging process, and the coloring state meeting the use requirement can be obtained only by adjusting the height of the balance weight on the material pressing plate.
As shown in FIG. 1, the invention designs the whole style, and performs design disassembly, and in software, an integral material pressing plate is separated into two-part number models.
As shown in fig. 2, the conventional metal pressing plate is divided into an upper part and a lower part, the upper part is a cavity/working molded surface, the lower part is a metal base/structural surface entity, and the upper part is amplified according to a certain proportion by the entity to be obtained during design to manufacture a foam plastic model. The metal base/structural surface entity is designed to ensure the functions of adhesion, combination and support with the elastomer resin material. And after the prepared cavity foamed plastic is subjected to chemical treatment, the prepared cavity foamed plastic is installed and sealed with the lower structure 2, and a hollow cavity is formed after the preparation, wherein the cavity is free of interference and has no closed space inside, so that the fluidity of an elastomer resin material in the pouring process and the size of a blank obtained after the pouring process are facilitated.
As shown in fig. 3, an elastomeric resin material is poured into the cavity after the bonding seal is cooled and solidified, and then the foam cavity shell is removed to obtain a blank conforming to the design.
As shown in fig. 4, after confirming the machining allowance, numerical control machining is performed to obtain a complete flexible pressing plate. And finally, assembling the processed integral pressing plate into the upper bottom plate, and statically inspecting and then closing the die. And after the die is assembled, the press is debugged, and the production can be realized after the debugging is completed.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. The manufacturing method of the cold stamping die pressing plate with the flexible pressing function is characterized by comprising the following steps of:
A. and (3) structural design of a material pressing plate: the material pressing plate consists of a working molded surface and a structural surface (2), wherein the working molded surface uses the structural surface (2) as a reference, the size of a hollow area in a cavity of the working molded surface is limited, the wall thickness of the cavity is 50mm, the structural surface is completely wrapped by the edge of the cavity, the side gap between the working molded surface and the structural surface (2) is between 2mm and 4mm, and a plurality of threaded holes are uniformly distributed on the structural surface (2);
B. numerical control machining of the foam cavity (1): selecting a whole foam plastic with a slightly larger design size as a blank material for processing the cavity, and adopting a numerical control machine tool to process the foam plastic to obtain a foam cavity (1) material object with the design size for standby;
C. preprocessing a structural surface (2): a base of a material pressing plate, namely a structural surface (2), is manufactured by adopting polystyrene foam casting;
D. phosphating the prefabricated structural surface (2): firstly removing greasy dirt attached to the structural surface (2) by using an organic solvent, repeatedly brushing a proper amount of 4 in 1 phosphating solution on the structural surface (2) by using a brush after the solvent volatilizes, further removing residual greasy dirt on the deep part of the casting, and forming a phosphating film on the processing surface;
E. the structural surface (2) is embedded with anti-falling screws: installing countersunk screws on the structural surface (2), and hooking an elastomer resin material for pressing by utilizing the dovetail heads exposed out of the countersunk screws;
F. surface hardening treatment of the foam cavity (1): b, coating epoxy resin or unsaturated resin on the surface of the foam cavity (1) prepared in the step B;
G. a pouring system for inflow of elastomer resin materials is arranged on the foam cavity (1), and the pouring system comprises a resin casting head and an exhaust pipe;
H. sealing and fixing the foam cavity (1) and the structural surface (2);
I. stirring and vacuum defoaming of an elastomer material: respectively weighing the multi-element resin materials according to the formula, pouring the multi-element resin materials into a stirrer for fully stirring and mixing, and then placing the mixed materials into a vacuum tank for vacuumizing and defoaming for 5 minutes, and taking out for later use;
J. and (3) pouring and curing an elastomer resin material: pouring an elastomer resin material into a foam cavity (1) to form a flexible blank of a flexible pressing plate by curing, wherein the pouring time of the elastomer resin material is 10-13 minutes, the environment temperature is 20-26 ℃, pouring of a pouring hole (4) of a resin pouring head at the lowest position of a die cavity is started when pouring is carried out, the liquid level of the resin is gradually lifted from low to high, the resin pouring is stopped when the liquid level of the pouring hole (4) at the highest position or an exhaust hole (5) of an exhaust pipe exceeds 5CM of the upper surface of the foam cavity (1), and the resin is cured for 140-160 hours at room temperature of 20 ℃, and is cured for 4-8 hours at 80 ℃;
K. removal of foam cavities: after the poured elastomer resin is completely cured, removing the pouring system, and removing the foam cavity (1) and the weather-proof sealant to prepare a blank of the blank pressing plate;
l, numerical control machining: adopting a numerical control machine tool to carry out numerical control processing to obtain a complete pressing plate which is consistent with the earlier design;
m, assembling and debugging: and D, assembling the integral pressing plate obtained in the step L into an upper bottom plate, statically inspecting, then closing the mold, and performing press upper debugging after closing the mold, and producing after debugging.
2. The method for manufacturing the cold stamping die pressing plate with the flexible pressing function according to claim 1, wherein the method comprises the following steps: and step A, the size of the cavity edge wrapping structural surface is 30mm.
3. The method for manufacturing the cold stamping die pressing plate with the flexible pressing function according to claim 1, wherein the method comprises the following steps: and step A, separating the threaded holes by 25-30 mm.
4. The method for manufacturing the cold stamping die pressing plate with the flexible pressing function according to claim 1, wherein the method comprises the following steps: and E, the length of the countersunk head screw is 16mm, and the screwing depth is 10mm.
5. The method for manufacturing the cold stamping die pressing plate with the flexible pressing function according to claim 1, wherein the method comprises the following steps: and F, for the large foam cavity (1), coating epoxy resin or unsaturated resin on the surface of the foam cavity (1), and reinforcing the foam cavity by adopting a glass fiber reinforced plastic material.
6. The method for manufacturing the cold stamping die pressing plate with the flexible pressing function according to claim 1, wherein the method comprises the following steps: the resin casting head is used for guiding elastomer resin into the foam cavity (1), and the resin casting head is fixed on the foam cavity (1) by adopting weather-resistant glue; the exhaust pipe is arranged at the high and narrow positions of the foam cavity (1) and used for observing the flowing filling condition of the elastomer resin material, removing residual gas in the cavity and ensuring that the elastomer resin can be fully filled in each position of the cavity.
7. The method for manufacturing the cold stamping die pressing plate with the flexible pressing function according to claim 6, wherein the method comprises the following steps: the resin casting heads are made of hard PVC pipes, the diameters are selected between 30mm and 50mm according to the volumes of the cavity and the die, the resin casting heads are distributed on the foam cavity (1) at the position not lower than 5 per square meter or distributed at the joint of the rib plate of the pressing surface, and the opening heights of all casting systems are basically flush; the exhaust pipe is made of a 10-12mm transparent PVC pipe.
8. The method for manufacturing the cold stamping die pressing plate with the flexible pressing function according to claim 1, wherein the method comprises the following steps: and step H, the fixing mode is bonding, pouring, screw connection or embedding.
9. The method for manufacturing the cold stamping die pressing plate with the flexible pressing function according to claim 1, wherein the method comprises the following steps: and K, removing the pouring system by adopting a manual sawing mode of a metal saw, and removing the foam cavity part and the weather-proof sealant by adopting a flat shovel.
10. The method for manufacturing the cold stamping die pressing plate with the flexible pressing function according to claim 1, wherein the method comprises the following steps: and M, the debugging process is as follows: the coloring state meeting the use requirement is obtained by adjusting the height of the balance weight on the material pressing plate.
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| CN101722239A (en) * | 2009-11-27 | 2010-06-09 | 马鞍山市辰兴机械制造有限公司 | High-precision stamping mould |
| CN102489802A (en) * | 2011-12-20 | 2012-06-13 | 哈尔滨工业大学 | Micro stamping die in-situ manufacturing device |
| CN111300693A (en) * | 2020-04-09 | 2020-06-19 | 江苏九铸合金新材料有限公司 | Alloy die manufacturing process and die manufactured by same |
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| JPS5669133A (en) * | 1979-11-08 | 1981-06-10 | Kiyokazu Motomura | Flush board manufacturing method |
| JPS56129147A (en) * | 1980-03-14 | 1981-10-09 | Sumitomo Bakelite Co Ltd | Foam molding |
| DE3343534A1 (en) * | 1983-12-01 | 1985-06-13 | Siemens Ag | METHOD FOR POURING CAVES |
| CN105834357A (en) * | 2016-04-07 | 2016-08-10 | 山东理工大学 | Rapid manufacturing method for resin casting die |
| CN105935863A (en) * | 2016-06-07 | 2016-09-14 | 北京航空航天大学 | Manufacturing method for hard rapid die |
| CN210498023U (en) * | 2019-07-05 | 2020-05-12 | 中国第一汽车股份有限公司 | Cold stamping die material pressing plate with flexible material pressing function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101722239A (en) * | 2009-11-27 | 2010-06-09 | 马鞍山市辰兴机械制造有限公司 | High-precision stamping mould |
| CN102489802A (en) * | 2011-12-20 | 2012-06-13 | 哈尔滨工业大学 | Micro stamping die in-situ manufacturing device |
| CN111300693A (en) * | 2020-04-09 | 2020-06-19 | 江苏九铸合金新材料有限公司 | Alloy die manufacturing process and die manufactured by same |
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