CN114393092A - A blanking process for reducing deformation of high-precision parts - Google Patents

Abstract

The invention discloses a punching process for reducing deformation of high-precision parts, comprising the following steps: step S1, placing a sheet material in a mold; step S2, the mold preliminarily punching the sheet material through the head to form a component pin; step S3, The die punches the sheet without punching to form a first tearing plate and a second tearing plate symmetrical to the first tearing plate; in step S4, the die punches the first tearing plate, the second tearing plate and the plate material to form component pins. When blanking the sheet material, the invention divides the blanking process into multiple steps, which effectively avoids the problem that the cantilever of the blanking blade is too long and causes the blanking blade to collapse, effectively prevents the problem of the component pins being deformed by force, and ensures the mold Obtain flat component pins under the premise of spare parts life.

Description

A blanking process for reducing deformation of high-precision parts

technical field

The invention relates to the technical field of molds, in particular to a punching process for reducing deformation of high-precision parts.

Background technique

Blanking is a stamping process that uses a die to separate sheets, including blanking, punching, notching, cutting, trimming, etc. It can be used to make parts or prepare blanks for bending, deep drawing, forming and other processes, such as blanking process to form component pins.

The traditional component pin blanking process is usually divided into two types. As shown in FIG. 1, one process is the overall blanking process of the component pins 10. In this process, the cantilever 20 of the cutting edge is too long and the width is usually less than 1mm, the strength around the punching edge is weak due to the punching force, which makes the punching edge easy to collapse, thereby increasing the cost of post-repair molds.

In order to solve the above problems, as shown in FIG. 2, the prior art discloses another process, which is to perform the original blanking process in two steps, firstly punch one side 101 of the component pins 10, and then punch the other side of the component pins 10. One side 102, which can effectively avoid the problem that the knife edge cantilever is too long. However, the disadvantage of this process is that the single-side punching easily affects the component sheet, so that the blanking area of the sheet is insufficient, resulting in the next process step. Deformed pins.

SUMMARY OF THE INVENTION

The present invention aims to solve one of the technical problems in the above technologies at least to a certain extent. Therefore, the purpose of the present invention is to propose a punching process for reducing deformation of high-precision parts, which divides the punching process into multiple steps, effectively avoiding the problem that the punching edge cantilever is too long to cause the punching edge to collapse, Effectively prevent the problem of component pins being deformed by force, and obtain flat component pins under the premise of ensuring the life of the mold parts.

In order to achieve the above purpose, an embodiment of the present invention proposes a blanking process for reducing deformation of high-precision parts, including the following steps:

Step S1, placing the sheet material in the mold;

Step S2, the mold initially punches the sheet material to form the head of the component pin;

Step S3, the die punches the sheet material without punching through to form a first tearing plate and a second tearing plate symmetrical with the first tearing plate;

Step S4, the mold punches the first tearing plate, the second tearing plate and the sheet material to form component pins.

According to a blanking process for reducing deformation of high-precision parts according to the embodiment of the present invention, when blanking the sheet, the sheet is first placed in the mold; then the mold preliminarily punches the sheet through the head to form the component pins, Due to the short length of the head of the component pins, the cantilever of the punching edge is short, and the problem of collapse of the punching edge will not occur; then the die will not punch through the sheet to form the first tearing plate and the second tearing plate. The first tearing plate and the second tearing plate are symmetrical, so there is no problem of component pins being deformed by force during stamping. component pins.

In addition, according to the above-mentioned embodiment of the present invention, the punching process for reducing deformation of high-precision parts may also have the following additional technical features:

Further, the mold includes a head punching mechanism for punching the sheet material to form the head of the component pin, a tearing plate punching mechanism for punching the sheet material without punching to form the first tearing plate and the second tearing plate, and The first tearing plate, the second tearing plate and the blank are punched through the waste punching mechanism for forming component pins.

Further, the tearing plate punching mechanism includes a tearing plate punch and a tearing plate concave die opposite to the tearing plate punch. slope formed between.

Further, the distance between the inner side and the tearing plate concave die is smaller than the distance between the outer side and the tearing plate concave die.

Further, the included angle formed by the inclined plane and the horizontal plane is 0.5 degrees to 2 degrees.

Further, the angle formed by the inclined plane and the horizontal plane is 1 degree.

Further, an R angle is provided on the outside to prevent the sheet from being torn.

Further, a punching gap is set between the tearing plate punch and the tearing plate concave die.

Further, the tearing plate punching mechanism also includes a tearing plate inner limit block, a tearing plate concave die pad and a floating ejector rod that limit the punching height, the tearing plate inner limit block is arranged in the tearing plate concave die, and the tearing plate concave die pad The block is connected to one side of the tearing plate concave die, and the floating ejector rod can pass through the tearing plate concave die spacer and eject the sheet material.

Further, the inner limiting block of the tearing plate includes an inclined surface parallel to the inclined surface and a curved surface opposite to the R angle.

Description of drawings

1 is a schematic structural diagram of a punching process in the prior art;

Fig. 2 is the structural representation of stamping punch in Fig. 1;

3 is a schematic structural diagram of another blanking process in the prior art;

4 is a flowchart of a blanking process for reducing deformation of high-precision parts according to an embodiment of the present invention;

5 is a schematic structural diagram of a punching process for reducing deformation of a high-precision part according to an embodiment of the present invention;

6 is a schematic structural diagram of a first stamping punch according to an embodiment of the present invention;

7 is a schematic structural diagram of a second punch punch and a third punch punch according to an embodiment of the present invention;

8 is a schematic structural diagram of a tearing plate punching mechanism according to an embodiment of the present invention;

FIG. 9 is an exploded view of a tearing plate punching mechanism according to an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a sheet material punched by a tear-off plate punching mechanism according to an embodiment of the present invention.

Label description

sheet 1;

Die 2, tearing plate punching mechanism 21, tearing plate punch 211, inner side 2111, outer side 2112, inclined surface 2113, R angle 2114, tearing plate concave die 212, tearing plate inner limit block 213, inclined surface 2131, curved surface 2132, Tear plate die spacer 214, floating ejector rod 215, elastic piece 216, first punching punch 22, body 221, first punching arm 222, second punching arm 223, punching gap 224, second punching punch 23, the third punching punch 24;

Component pins 3 , head 31 , first tearing plate 32 , second tearing plate 33 .

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.

As shown in FIGS. 3 to 10 , a blanking process for reducing deformation of high-precision parts according to an embodiment of the present invention includes the following steps:

In step S1, the sheet material 1 is placed in the mold 2; in step S2, the mold 2 preliminarily punches the sheet material 1 through the head 31 to form the component pins 3; The tearing plate 32 and the second tearing plate 33 symmetrical to the first tearing plate 32 ; in step S4 , the mold 2 punches the first tearing plate 32 , the second tearing plate 33 and the sheet material 1 to form the component pins 3 .

When blanking the sheet 1, first place the sheet 1 in the mold 2; then the mold 2 initially punches the sheet 1 to form the head 31 of the component pin 3, because the length of the head 31 of the component pin 3 is short , so that the cantilever of the punching edge is short, and the problem of the collapse of the punching edge will not occur; then the die 2 punches the sheet material 1 without punching through to form the first tearing plate 32 and the second tearing plate 33, because the first tearing plate 32 Symmetrical with the second tearing plate 33, the problem of force deformation of the component pins 3 will not occur during stamping. Finally, the die 2 punches the first tearing plate 32, the second tearing plate 33 and the sheet 1 to form the component pins 3, thereby forming the component pins 3. Get flat component pin 3.

Optionally, the die 2 includes a head punching mechanism for punching the sheet 1 to form the head 31 of the component pins 3, and for punching the sheet 1 without punching to form the first tearing plate 32 and the second tearing plate. 33 of the tearing plate punching mechanism 21 and the waste punching mechanism for punching the first tearing plate 32 , the second tearing plate 33 and the sheet material 1 to form the component pins 3 .

Among them, the head punching mechanism is to punch the sheet material 1 through the head 31 to form the component pins 3, which includes a first punching punch 22, and the first punching punch 22 includes a body 221, a first punching arm 222 and a second punching A punching gap 224 is formed between the arms 223, the first punching arm 222 and the second punching arm 223. The lengths of the first punching arm 222 and the second punching arm 223 are short, which can effectively avoid the problem of the punching edge being damaged during punching . The scrap punching mechanism includes a second punching punch 23 and a third punching punch 24, the second punching punch 23 and the third punching punch 24 are independent of each other, and the second punching punch 23 and the third punching punch 24 are symmetrical to each other In order to prevent the component pins 3 from being deformed by force during punching, since the second punching punch 23 and the third punching punch 24 are independent of each other, the problem of punching edge breakage will not occur.

In this example, the tearing plate punching mechanism 21 includes a tearing plate punch 211 and a tearing plate concave die 212 opposite to the tearing plate punch 211 . The inner side 2111 is opposite to the outer side 2112, and a slope 2113 is formed between the outer side 2112 and the inner side 2111. Wherein, the distance between the inner side 2111 and the tearing plate concave die 212 is smaller than the distance between the outer side 2112 and the tearing plate concave die 212 . The angle formed by the inclined plane 2113 and the horizontal plane is 0.5 degrees to 2 degrees. As a preferred embodiment, the angle formed by the inclined plane 2113 and the horizontal plane is 1 degree.

After testing, it is found that when the angle formed by the inclined plane 2113 and the horizontal plane is 0.5 degrees to 2 degrees, when the tearing plate punch 211 is punched, the force of the sheet 1 is distributed in a step-like manner, which makes the punching effect better. The punching depth of the inner 2111 sheet 1 is greater than the punching depth of the outer 2112 sheet 1 to prevent tearing during punching.

In some examples, an R angle 2114 is set on the outer side 2112 to prevent the sheet material 1 from being torn, wherein the size of the R angle 2114 is preferably 0.3m, so that during punching, this part of the material will not be torn, but will be bent, The connection strength between the first tearing plate 32 and the plate material 1 is guaranteed, and the connection strength between the second tearing plate 33 and the plate material 1 is guaranteed.

As an example, a punching gap is set between the tearing plate punch 211 and the tearing plate concave die 212 . The punching gap is preferably less than 0.03mm, for example, it can be 0.03mm. The smaller the punching gap, the higher the punching slump angle Small, but the inserts are seriously worn. Therefore, a reasonable blanking gap can not only ensure the quality of the components, but also ensure the life of the die 2 inserts.

In this example, the tearing plate punching mechanism 21 also includes a tearing plate inner limit block 213, a tearing plate concave die spacer 214 and a floating ejector rod 215 that limit the punching height. In 212, the tearing plate concave die spacer 214 is connected to one side of the tearing plate concave die 212, the floating ejector rod 215 can pass through the tearing plate concave die spacer 214 and push out the sheet 1, when the tearing plate punching mechanism 21 punches When the R angle 2114 of the outer side 2112 corresponds to the position of the sheet material 1, it shows a bending tendency and does not tear, and cooperates with the inclined surface 2113 to realize stepped punching. The limit block 213 in the tear plate limits the punching height and prevents punching through. The floating ejector bar 215 of the tear-off plate concave die block 214 is ejected to prevent the sheet 1 from being deformed due to unsmooth stripping. Wherein, the floating top rod 215 is connected with an elastic member 216, such as a compression spring, by connecting the compression spring, the floating top rod 215 can be ejected.

In this example, the tearing plate inner limit block 213 includes an inclined surface 2131 parallel to the inclined surface 2113 and a curved surface 2132 opposite to the R angle 2114. In this way, when the tearing plate punch 211 is punched, it can effectively connect with the tearing plate inner limit block 213. In cooperation, the thicknesses of the first tearing plate 32 and the second tearing plate 33 are the same, and the R angle 2114 and the curved surface 2132 prevent the sheet material 1 from being torn and ensure that the sheet material 1 is bent.

The above-mentioned embodiments and drawings do not limit the product form and style of the present invention, and any appropriate changes or modifications made by those of ordinary skill in the art should be regarded as not departing from the scope of the present invention.

Claims (10)

1. a blanking process for reducing deformation of high-precision parts, is characterized in that, comprises the following steps: Step S1, placing the sheet material in the mold; Step S2, the mold initially punches the sheet material to form the head of the component pin; Step S3, the die punches the sheet material without punching through to form a first tearing plate and a second tearing plate symmetrical with the first tearing plate; Step S4, the mold punches the first tearing plate, the second tearing plate and the sheet material to form component pins. 2. The punching process for reducing deformation of high-precision parts according to claim 1, wherein the die comprises a head punching mechanism for punching the sheet material to form the head of the pin of the element, for punching the sheet material A tearing plate punching mechanism that does not punch out the first tearing plate and the second tearing plate and a waste punching mechanism that punches the first tearing plate, the second tearing plate and the sheet material to form component pins. 3. The punching process for reducing deformation of high-precision parts as claimed in claim 2, wherein the tearing plate punching mechanism comprises a tearing plate punch and a tearing plate concave die opposite to the tearing plate punch, and the tearing plate punch The end of the die close to the tearing plate includes an inner side and an outer side opposite to the inner side, and an inclined surface formed between the outer side and the inner side. 4 . The punching process for reducing deformation of high-precision parts according to claim 3 , wherein the distance between the inner side and the tearing plate concave die is smaller than the distance between the outer side and the tearing plate concave die. 5 . 5 . The punching process for reducing deformation of high-precision parts according to claim 3 , wherein the angle formed by the inclined plane and the horizontal plane is 0.5 degrees to 2 degrees. 6 . 6 . The punching process for reducing deformation of high-precision parts according to claim 5 , wherein the angle formed by the inclined plane and the horizontal plane is 1 degree. 7 . 7 . The punching process for reducing deformation of high-precision parts according to claim 3 , wherein an R angle is set on the outside to prevent the sheet from being torn. 8 . 8 . The punching process for reducing deformation of high-precision parts according to claim 1 , wherein a punching gap is set between the tearing plate punch and the tearing plate concave die. 9 . 9. The punching process for reducing deformation of high-precision parts as claimed in claim 2, wherein the tearing plate punching mechanism further comprises a tearing plate inner limit block, a tearing plate concave die spacer and a floating top that limit the punching height The inner limit block of the tearing plate is set in the tearing plate concave die, the tearing plate concave die cushion block is connected with one side of the tearing plate concave die, and the floating ejector rod can pass through the tearing plate concave die cushion block and push out the sheet material. 10 . The punching process for reducing deformation of high-precision parts according to claim 9 , wherein the limiting block in the tearing plate comprises an inclined surface parallel to the inclined surface and a curved surface opposite to the R angle. 11 .

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