CN115229457A - Processing method of large and small hole honeycomb structure body extrusion die - Google Patents
Processing method of large and small hole honeycomb structure body extrusion die Download PDFInfo
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- CN115229457A CN115229457A CN202211134655.9A CN202211134655A CN115229457A CN 115229457 A CN115229457 A CN 115229457A CN 202211134655 A CN202211134655 A CN 202211134655A CN 115229457 A CN115229457 A CN 115229457A
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- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/24—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass dies
- B23P15/243—Honeycomb dies
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Abstract
The invention relates to a processing method of a large and small hole honeycomb structure body extrusion die, which comprises the following steps: step 1) selecting high-carbon steel as a raw material to perform blank processing, and processing the high-carbon steel into a structure body adaptive to an extruder; step 2), carrying out heat treatment processing and feed hole processing on the structural body; and 3) carrying out extrusion molding groove processing on the structural body, and carrying out single-row curve processing technology on the graphite electrode which is arranged and calibrated on the engraving and milling machine to form the extrusion molding groove. The invention provides a processing method of a large and small hole honeycomb structure body extrusion die, belongs to the technical field of honeycomb ceramic processing, and can improve the manufacturing precision and the wear resistance of the large and small hole honeycomb structure body, prolong the service life and reduce the cost.
Description
Technical Field
The invention relates to a processing method of a large and small hole honeycomb structure body extrusion die, and belongs to the technical field of honeycomb ceramic processing.
Background
The honeycomb ceramic DPF used in the market at present is a symmetrical product, namely the volume ratio of the smoke storage hole to the smoke filtering hole is 1:1. The disadvantage is that the smoke storage amount is small; the carbon carrying amount is small; the back pressure is used; the volume is large. Asymmetric honeycomb ceramics DOF has been promoted to above problem, big aperture honeycomb ceramics DPF promptly, and the proportion of aperture and macropore is about 1.7, and the macropore stores up the cigarette, and the aperture filters out the cigarette, great improvement store up cigarette volume and carbon loading capacity, reduced the use backpressure to reduce the volume, improved the effect of environmental protection.
However, most of the extrusion dies for the large and small-hole honeycomb structures used at present are processed by metal 3D, and the defects are that the roughness of the inner walls of the feeding holes and the forming grooves is too large, the width precision of the forming grooves is poor, more importantly, the abrasion resistance is poor, and the service life is too short.
A small part of the electrodes are processed by a common electric spark machine tool, and the grid electrodes processed by red copper are used. The method has the defects that the electrode processing cost is high, the rejection rate of the electrode is high, the electrode is easy to deform, the fine adjustment of the discharge power of a common electric spark machine tool is limited, and a processed mold forming groove is large in size and poor in uniformity and can be used only through film coating, so that the mold manufacturing cost is greatly increased.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a processing method of a large-and-small-hole honeycomb structure body extrusion die, which can improve the manufacturing precision and the wear resistance of the large-and-small-hole honeycomb structure body, prolong the service life and reduce the cost.
The technical scheme for solving the technical problems is as follows: a processing method of an extrusion die of a honeycomb structure with large and small holes comprises the following steps: step 1) selecting high-carbon steel as a raw material to perform blank processing, and processing the high-carbon steel into a structure body adaptive to an extruder;
step 2), carrying out heat treatment processing and feed hole processing on the structural body;
and 3) processing the extrusion molding groove of the structural body, and carrying out single-row curve processing technology molding on the graphite electrode which is arranged and calibrated on an engraving and milling machine to form the extrusion molding groove.
The beneficial effects of the invention are: the high-carbon steel has strong wear resistance; carrying out heat treatment on the structural body to ensure that the structural body is hard outside and soft inside, improving the impact resistance and prolonging the service life, and respectively processing an extrusion molding groove and a feeding hole on two surfaces of the structural body to form a die capable of preparing a large-hole honeycomb structural body and a small-hole honeycomb structural body; the graphite has the characteristic of no bending and replaces a red copper electrode which is easy to deform; the graphite electrode is used for replacing red copper processing electrode, so that the toughness is improved, the deformation is prevented, and the cost is reduced.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the front surface of the structural body is provided with the extrusion molding groove, the back surface of the structural body is provided with the feeding hole, and the bottom of the extrusion molding groove is communicated with the feeding hole.
Further, the heat treatment in the step 2) is processed until the hardness of the structure from the surface skin to the surface skin lower 5mm is HRC 55-62 degrees, and the structure hardness fluctuation range is controlled to be +/-2 degrees.
The beneficial effect of adopting the further scheme is that: the hardness and stability of the structure are improved, and the service life is prolonged.
Further, the parameters of the heat treatment processing are that the initial temperature is 90-100 ℃, the temperature rise speed of the heat treatment is 150-160 ℃/h, the temperature is raised to 840-880 ℃, the temperature is kept for 1-2 h, and then the quenching is carried out by adopting an oil quenching process.
The beneficial effect of adopting the further scheme is that: the temperature rise speed is 150-160 ℃/h, the temperature is raised to 840-880 ℃ after 5-6 hours, the temperature is kept for 1-2 hours, and then the oil quenching process is adopted for quenching, so that the molecules in the structure body are more stable, the stability of the structure body is strong, and the structure body is not easy to deform.
Further, the oil quenching process comprises the steps of quenching at the temperature of 840-880 ℃, preserving heat for 40-90 minutes, and tempering for 4-6 hours at the temperature of 150-220 ℃ after oil quenching to 50 ℃.
The beneficial effect of adopting the further scheme is that: the hardness can reach HRC55 +/-5 degrees.
Further, the processing of the feed hole specifically comprises: using a precise CNC machine tool, firstly adopting an alloy fixed point drill to accurately find a position, and drilling a lead hole to ensure the position accuracy of the feed hole and the perpendicularity of a pore passage; then, a high-speed steel twist drill is adopted to process with the feed amount of 0.75mm each time, and the aperture error is controlled to be +/-0.05 mm.
Further, the single-line curve processing specifically comprises: firstly, processing a first forming groove on the front surface of the structural body along a first direction, enabling the bottom of the first forming groove to be communicated with the feeding hole, rotating the graphite electrode by 90 degrees, processing a second forming groove along a second direction vertical to the first direction, enabling the bottom of the second forming groove to be communicated with the feeding hole, and enabling the first forming groove and the second forming groove to form the extrusion forming groove.
The beneficial effect of adopting the further scheme is that: graphite is used to replace red copper to process electrodes, so that the toughness is improved and the deformation is prevented.
Further, after the single-row curve is processed, a brand new graphite electrode is replaced to clean the bottoms of the first forming groove and the second forming groove until the bottom of the extrusion forming groove is connected with the feeding hole by 0.8-1 mm and the error is +/-0.05 mm, and die processing is completed.
The beneficial effect of adopting the further scheme is that: and single-row curve processing is used for replacing grid processing, so that the electrode processing cost is reduced, and the electrode rejection rate is reduced.
Further, the type of the high carbon steel material is Cr12mov.
Further, the feed port is a round hole.
The beneficial effect of adopting the above further scheme is: the round hole is convenient to process and has large inner surface area.
Drawings
FIG. 1 is a schematic structural diagram of a first forming groove formed along a first direction in a method for processing a large-and-small-hole honeycomb structure extrusion die according to the present invention;
FIG. 2 is a schematic structural diagram of the front side of a die in the method for processing a large and small honeycomb structure extrusion die according to the present invention;
FIG. 3 is a schematic structural view of the reverse side of a die in a method for manufacturing an extrusion die for a large and small honeycomb structural body according to the present invention;
fig. 4 isbase:Sub>A cross-sectional view taken alongbase:Sub>A-base:Sub>A in fig. 2.
In the drawings, the components represented by the respective reference numerals are listed below:
1-structural body, 12-feeding hole, 13-extrusion molding groove, 131-first molding groove and 132-second molding groove.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
The invention aims to provide a processing method of an extrusion die of a large-hole honeycomb structure body and a small-hole honeycomb structure body, which aims to solve the problems in the prior art, improve the manufacturing precision and the wear resistance of the large-hole honeycomb structure body and the small-hole honeycomb structure body, prolong the service life and reduce the cost.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides a processing method of an extrusion die of a large-hole honeycomb structure body and a small-hole honeycomb structure body, and in a specific embodiment of the invention, as shown in figures 1-4, the processing method comprises the following steps: step 1), selecting high-carbon steel as a raw material to perform blank processing, and processing the high-carbon steel into a structure body 1 adaptive to an extruder;
step 2), carrying out heat treatment processing and feed hole 12 processing on the structural body 1;
and 3), processing the structure body 1 into an extrusion molding groove 13, and performing single-row curve processing on the graphite electrode which is arranged and calibrated on the engraving and milling machine to form the extrusion molding groove 13.
The invention provides a processing method of a large and small hole honeycomb structure body extrusion die, high-carbon steel has strong wear resistance; carrying out heat treatment on the structural body 1 to ensure that the structural body is hard outside and soft inside, improving the impact resistance and prolonging the service life, and processing feed holes 12 and extrusion molding grooves 13 on the front surface and the back surface of the structural body 1 to form a die capable of preparing the large-pore honeycomb structural body 1 and the small-pore honeycomb structural body 1; the graphite has the characteristic of no bending and replaces a red copper electrode which is easy to deform; the graphite electrode is used for replacing red copper processing electrode, so that the toughness is improved, the deformation is prevented, and the cost is reduced.
In a specific embodiment of the invention, the front surface of the structural body 1 is provided with an extrusion molding groove 13, the back surface of the structural body is provided with a feeding hole 12, and the bottom of the extrusion molding groove 13 is communicated with the feeding hole 12.
In one embodiment of the invention, the heat treatment in the step 2) is carried out until the hardness of the structural body 1 from the surface skin to the part below the surface skin is HRC 55-62 degrees, and the hardness fluctuation range of the structural body 1 is controlled within +/-2 degrees.
The hardness and stability of the structure 1 are improved, and the service life is prolonged.
In a specific embodiment of the invention, the parameters of the heat treatment processing are that the initial temperature is 90-100 ℃, the temperature rise speed of the heat treatment is 150-160 ℃/h, the temperature is raised to 840-880 ℃, the temperature is preserved for 1-2 h, and then the oil quenching process is adopted for quenching.
The parameters of the heat treatment processing are that the initial temperature is 90-100 ℃, the temperature rising speed is 150-160 ℃/h, the temperature is raised to 840-880 ℃ after 5-6 hours, the temperature is kept for 1-2 hours, and then the oil quenching process is adopted for quenching, so that the molecules in the structural body 1 are more stable, and the structural body 1 is strong in stability and not easy to deform.
In a specific embodiment of the invention, the oil quenching process comprises the steps of quenching at 840-880 ℃, preserving heat for 40-90 minutes, and tempering at 150-220 ℃ for 4-6 hours after oil quenching to 50 ℃.
The hardness can reach HRC55 +/-5 degrees.
In a specific embodiment of the present invention, the processing of the feeding hole 12 specifically comprises: using a precise CNC machine tool, firstly adopting an alloy fixed point drill to accurately find the position, and drilling a lead hole to ensure the position accuracy of the feed hole 12 and the perpendicularity of a pore passage; then, a high-speed steel twist drill is adopted to process with the feed amount of 0.75mm each time, and the aperture error is controlled to be +/-0.05 mm.
In an embodiment of the present invention, the single-line curve processing specifically includes: firstly, a first forming groove 131 is processed on the front surface of the structural body 1 along the first direction, so that the groove bottom of the first forming groove 131 is communicated with the feeding hole 12, the graphite electrode is rotated by 90 degrees, a second forming groove 132 is processed along the second direction vertical to the first direction, so that the groove bottom of the second forming groove 132 is communicated with the feeding hole 12, and the first forming groove 131 and the second forming groove 132 form the extrusion forming groove 13.
Because the machining of cnc engraving and milling machine overlooks all to have the R angle, can't adopt the graphite electrode on the cnc engraving and milling machine to carry out the grid processing, first shaping groove 131 and the processing of second shaping groove 132 separately can avoid above problem.
In one embodiment of the invention, after the single-row curve processing is finished, a brand-new graphite electrode is replaced to clean the bottoms of the first forming groove 131 and the second forming groove 132 until the bottom of the extrusion forming groove is connected with the feed hole 12 by 0.8-1 mm with a tolerance of +/-0.05 mm, and the die processing is finished.
The beneficial effect of adopting the further scheme is that: and single-row curve processing is used for replacing grid processing, so that the electrode processing cost is reduced, and the electrode rejection rate is reduced.
Preferably, a high-precision mirror surface spark machine is selected to process the forming groove, the discharge power is precisely controlled, the inner wall of the formed groove is smooth, and the groove width is consistent; the high-precision mirror spark machine can be selected from Mitsubishi SG8, sudick AQ55L or Muyao EDNC43.
In one embodiment of the present invention, the type of the high carbon steel is Cr12mov.
In one embodiment of the present invention, the inlet 12 is a circular hole.
The round hole is convenient to process and the inner surface area is large.
Preferably, the diameter of the circular hole is 1.5 to 1.6mm.
The embodiment of the invention comprises the following processes:
1. selecting a Cr12mov high-carbon steel material as a blank, and processing a structural body 1 suitable for an extruder of the company by using a high-carbon steel lathe and a surface grinding machine;
2. the method comprises the steps of adopting a heat treatment process, wherein the initial temperature is 100 ℃, the heat treatment temperature rise speed is 150 ℃/h, the temperature rise is 5 hours, the temperature reaches 850 ℃, the heat preservation time is 1.5 hours, then adopting an oil quenching process for quenching, the quenching temperature of the oil quenching process is 850 ℃, the heat preservation time is 75 minutes, after oil quenching is carried out to 50 ℃, the temperature is kept at 190 ℃, tempering is carried out for 5 hours, the steel is processed until the hardness of the steel is HRC 55-62 degrees from the surface skin to the part below the surface skin of the structural body 1, and the hardness fluctuation range of the structural body 1 is controlled to be +/-2 degrees so as to ensure the wear resistance, the impact resistance and the stability of the structural body 1;
3. using a precise CNC machine tool, firstly adopting an alloy fixed point drill to accurately find the position, and drilling a lead hole to ensure the position accuracy of the feed hole 12 and the perpendicularity of a pore passage; then, a high-speed steel twist drill is adopted to process with the feed amount of 0.75mm each time, the aperture error is controlled to be +/-0.05 mm, the inner wall of the pore channel is ensured to be smooth, the hole position is accurate, and the pore channel is vertical;
4. the extrusion molding groove 13 is processed, and the process is divided into two parts:
4.1 electrode processing, adopt graphite as the electrode, adopt CNC CNC engraving and milling machine one-way curve processing electrode shaping public position to and installation position and calibration position.
4.2, performing electric spark machining, namely machining by using a Mitsubishi SG8 high-precision mirror surface electric spark machine tool, machining a first forming groove 131 on the front surface of the structural body 1 along a first direction by using the characteristics that the discharge power of the electric spark machine tool can be finely adjusted and the electrode loss is small, connecting the groove bottom of the first forming groove 131 with a feed hole 12, rotating a graphite electrode by 90 degrees, machining a second forming groove 132 along a second direction vertical to the first direction, connecting the groove bottom of the second forming groove 132 with the feed hole 12, and forming an extrusion forming groove 13 by using the first forming groove 131 and the second forming groove 132; and then, a brand new graphite electrode is replaced to clean the bottoms of the first forming groove 131 and the second forming groove 132 until the connection between the extrusion forming groove and the feeding hole 12 is 0.8-1 mm, and the error is +/-0.05 mm, so that the die machining is completed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A processing method of an extrusion die of a honeycomb structure with large and small holes is characterized by comprising the following steps: step 1), selecting high-carbon steel as a raw material to perform blank processing, and processing the high-carbon steel into a structure body (1) adaptive to an extruder;
step 2), carrying out heat treatment processing and feeding hole (12) processing on the structural body (1);
and 3) processing the extrusion molding groove (13) of the structure body (1), and performing single-row curve processing technology molding on the extrusion molding groove (13) by adopting a graphite electrode which is installed and calibrated on an engraving and milling machine.
2. The method for processing the extrusion die of the honeycomb structural body with the large and the small holes as claimed in claim 1, wherein the extrusion molding groove (13) is processed on the front surface of the structural body (1), the feeding hole (12) is processed on the back surface of the structural body, and the bottom of the extrusion molding groove (13) is communicated with the feeding hole (12).
3. The method for processing an extrusion die of a large-and-small-hole honeycomb structure body according to claim 1, wherein the heat treatment in the step 2) is performed until the hardness of the structure body (1) from the skin to 5mm below the skin is HRC 55-62 degrees, and the hardness fluctuation range of the structure body (1) is controlled within +/-2 degrees.
4. The processing method of the extrusion die of the honeycomb structure with the large and small holes as claimed in claim 3, wherein the parameters of the heat treatment processing are that the initial temperature is 90-100 ℃, the temperature rising speed of the heat treatment is 150-160 ℃/h, the temperature rises to 840-880 ℃, the temperature is kept for 1-2 h, and then the quenching is carried out by adopting an oil quenching process.
5. The processing method of the extrusion die of the honeycomb structure with the large and small holes as the claim 4, wherein the oil quenching process comprises the steps of quenching at 840-880 ℃, keeping the temperature for 40-90 minutes, oil quenching to 50 ℃, keeping the temperature at 150-220 ℃ and tempering for 4-6 hours.
6. The processing method of the extrusion die of the honeycomb structure with the large and small holes as the claim 1 is characterized in that the feeding holes (12) are processed as follows: using a precise CNC machine tool, firstly adopting an alloy fixed-point drill to precisely position, and drilling a lead hole to ensure the position accuracy of the feed hole (12) and the perpendicularity of a pore channel; then, a high-speed steel twist drill is adopted to process with the feed amount of 0.75mm each time, and the aperture error is controlled to be +/-0.05 mm.
7. The method for processing an extrusion die of a large-and-small-hole honeycomb structure body according to claim 1, wherein the single-row curve processing is specifically as follows: firstly, a first forming groove (131) is machined in the front face of the structural body (1) along a first direction, the groove bottom of the first forming groove (131) is communicated with the feeding hole (12), the graphite electrode is rotated by 90 degrees, a second forming groove (132) is machined along a second direction perpendicular to the first direction, the groove bottom of the second forming groove (132) is communicated with the feeding hole (12), and the first forming groove (131) and the second forming groove (132) form the extrusion forming groove (13).
8. The method for processing the extrusion die of the honeycomb structure with the large and the small holes as claimed in claim 7, wherein the single-row curve processing is finished, and then a completely new graphite electrode is replaced to clear the bottoms of the first forming groove (131) and the second forming groove (132) until the bottoms of the extrusion forming grooves and the feeding holes (12) are jointed by 0.8-1 mm with a tolerance of +/-0.05 mm, and the die processing is finished.
9. The method of claim 1, wherein the high carbon steel material is Cr12mov.
10. The method for processing an extrusion die of a honeycomb structure with large and small holes as claimed in claim 1, wherein the feed holes (12) are circular holes.
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| CN202211134655.9A CN115229457A (en) | 2022-09-19 | 2022-09-19 | Processing method of large and small hole honeycomb structure body extrusion die |
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Application publication date: 20221025 |