CN113320062A

CN113320062A - Manufacturing method of cold stamping die pressing plate with flexible pressing function

Info

Publication number: CN113320062A
Application number: CN202110555322.2A
Authority: CN
Inventors: 高钰超; 曲岩松; 隋志华; 王文泽; 郑坤; 密思斌; 王国富; 郎庆东; 汪建余; 刘冬
Original assignee: FAW Group Corp; Faw Tooling Die Manufacturing Co Ltd
Current assignee: FAW Group Corp; Faw Tooling Die Manufacturing Co Ltd
Priority date: 2021-05-21
Filing date: 2021-05-21
Publication date: 2021-08-31
Anticipated expiration: 2041-05-21
Also published as: CN113320062B

Abstract

The invention relates to a manufacturing method of a cold stamping die pressure plate with a flexible pressure function, which comprises the steps of pressure plate structure design, foam cavity numerical control processing, structural surface preprocessing, structural surface phosphating after preprocessing, structural surface pre-embedded anti-drop screws, foam cavity surface hardening processing, arranging a pouring system for an elastomer resin material to flow in on a foam cavity, sealing and fixing the foam cavity and the structural surface, stirring and vacuum defoaming the elastomer material, pouring and curing the elastomer resin material, removing the foam cavity, and performing numerical control processing, assembly and debugging. The manufacturing method of the cold stamping die pressure plate with the flexible pressure function can greatly improve the surface quality and the 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

Manufacturing method of cold stamping die pressing plate with flexible pressing function

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 pressure plate with a flexible pressure function.

Background

The metal pressing mode is the mainstream mode of the mold pressing at the present stage, but through years of use and verification, the existing functions of the traditional pressing mode are weakened by the requirements of increasingly improved quality and production efficiency. The defects of pressure injury, poor coloring and the like in the production and debugging processes are amplified.

Aiming at the defects, at present, domestic die manufacturers generally adopt a research and preparation mode to ensure the influence of the pressure plate on the coloring, the size and the flour product of a finished piece. However, there are problems of high labor intensity, high processing cost, long debugging period, and difficulty in ensuring coloring, size, and surface quality.

Disclosure of Invention

The invention provides a manufacturing method of a cold stamping die pressure plate with a flexible pressure function, which aims to solve the problems of high labor intensity, high processing cost, long debugging period and incapability of ensuring coloring, size and quality of flour products in the process of manufacturing the pressure plate in a grinding and matching mode.

The purpose of the invention is realized by the following technical scheme:

a manufacturing method of a cold stamping die pressure plate with a flexible pressure function comprises the following steps:

A. the structural design of the pressure plate is as follows: the pressure plate is composed 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 gap between the working molded surface and the side surface of 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 a foam cavity 1: selecting a whole piece of foam plastic slightly larger than the designed size as a blank for processing the cavity, and processing the foam plastic by adopting a numerical control machine tool to obtain a foam cavity 1 real object in accordance with the designed size for later use;

C. preprocessing a structural surface 2: casting polystyrene foam to obtain a metal base of the pressure plate, namely a structural surface;

D. and (3) phosphating the preprocessed structural surface: removing oil stains attached to the structural surface 2 by using an organic solvent, dipping a proper amount of 4-in-1 phosphating solution by using a brush after the solvent is volatilized, repeatedly coating the structural surface 2, further removing residual oil stains at the deep part of a casting and forming a phosphating film on a machined surface;

E. embedding an anti-drop screw on a structural surface: mounting a countersunk head screw on the structural surface 2, and hooking an elastomer resin material for material pressing by utilizing a dovetail-shaped head part of the countersunk head screw exposed outside;

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 the inflow of the elastomer resin material is arranged on the foam cavity 1 and 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 elastomer materials: weighing the multi-component resin materials according to the formula, pouring the materials into a stirrer to be fully stirred and mixed, putting the mixed materials into a vacuum tank, vacuumizing and defoaming for 5 minutes, and taking out the materials for later use;

J. pouring and curing the elastomer resin material: pouring an elastomer resin material into the foam cavity 1 to be cured to form a flexible blank of the flexible pressure plate, wherein the pouring time of the elastomer resin material is 10-13 minutes, the ambient temperature is 20-26 ℃, pouring is started at a pouring hole 4 of a resin pouring head at the lowest position of a mold cavity during pouring, the liquid level of the resin is gradually lifted from low to high, the pouring of the resin 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 on the upper surface of the foam cavity 1 at the position, the curing is carried out for 160 hours at the room temperature of 20 ℃, and the curing is carried out for 4-8 hours at the temperature of 80 ℃;

K. removing the foam cavity 1: after the elastomer resin poured is completely cured, removing the pouring system, and then removing the foam cavity 1 and the weather-resistant sealant to obtain a blank of the pressure plate;

l, numerical control machining: carrying out numerical control machining by adopting a numerical control machine tool to obtain a complete pressure plate which is consistent with the previous design;

m, assembling and debugging: and D, assembling the integral material pressing plate prepared in the step L into an upper base plate, carrying out die assembly after static inspection, carrying out on-press debugging after die assembly, and carrying out production after debugging.

Further, in the step A, the size of the cavity edge wrapping structure surface is 30 mm.

Further, in the step A, each threaded hole is 25mm-30mm apart.

Further, in the step E, the length of the countersunk head screw is 16mm, and the screwing depth is 10 mm.

Further, in step F, for the large-sized foam cavity, the surface of the foam cavity 1 is coated with epoxy resin or unsaturated resin, and is reinforced by glass fiber reinforced plastic material.

Further, the resin casting head is used for introducing 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 position and the narrow position of the structure 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 to each position of the cavity.

Furthermore, the resin casting head is made of hard PVC pipes, the diameter of the resin casting head is selected between 30mm and 50mm according to the volume of the cavity and the mould, and the resin casting head is distributed on the foam cavity 1 at a position not less than 5 per square meter or distributed at the node of the rib plate of the material pressing surface, so that the opening heights of all casting systems are basically flush; the exhaust pipe 5 is made of a transparent PVC pipe with the thickness of 10-12 mm.

Further, in the step H, the fixing mode is bonding, pouring, screw connection or embedding.

And step K, removing the pouring system by adopting a metal saw manual sawing mode, and removing the foam cavity 1 and the weather-resistant sealant by adopting a flat shovel.

Further, in step M, the debugging process is: the coloring state meeting the use requirement is obtained by adjusting the height of the balance block on the pressure plate.

Compared with the prior art, the invention has the beneficial effects that:

the cold stamping die pressure plate with the flexible pressure function is manufactured by using the elastic resin material, can be applied to a cold stamping die, can realize the pressure function in the stamping process, can reduce the grinding or a small amount of grinding by a pressure device, has the effects of improving the size and the flour product of a workpiece, can improve the efficiency and reduce the cost, can greatly improve the surface quality and the 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.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1-3 are exploded views of a cold stamping die pressing plate with a flexible pressing function;

FIG. 4 is a schematic illustration of a casting system;

FIG. 5 is a structural diagram of a cold stamping die pressing plate with a flexible pressing 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 is a foam cavity 2, a structural surface 3, a fixed position 4, a pouring hole 5 and an exhaust hole.

Detailed Description

The invention is further illustrated by the following examples:

the present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.

As shown in fig. 1 to 7, the method for manufacturing a cold stamping die pressing plate with a flexible pressing function of the invention comprises the following steps:

A. the structural design of the pressure plate is as follows: the pressure flitch comprises working profile and structural plane 2, and wherein, the working profile uses structural plane 2 as the benchmark, carries out size restriction to the hollow region in the working profile cavity, and the cavity wall thickness is 50mm, and the structural plane 2 is lived in the complete parcel of cavity edge, the size of cavity edge parcel structural plane 2 is 30 mm. The gap between the working molded 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 every two threaded holes is 25mm-30 mm;

E. structural plane 2 pre-embedded anti-drop screw: mounting a countersunk head screw on the structural surface 2, and hooking an elastomer resin material for material pressing by utilizing a dovetail-shaped head part of the countersunk head screw exposed outside, wherein the length of the countersunk head screw is 16mm, and the screwing depth is 10 mm;

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-scale foam cavity 1, on the basis of coating epoxy resin or unsaturated resin on the surface of the foam cavity 1, glass fiber reinforced plastic material is adopted for reinforcement;

G. a pouring system for the inflow of the elastomer resin material 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 introducing 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 system is arranged at the high position and the narrow position of the foam cavity 1 structure 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 method comprises the following steps: the resin casting head is made of hard PVC pipes, the diameter of the resin casting head is selected between 30mm and 50mm according to the volume of the cavity and the mould, and the resin casting head is distributed on the foam cavity 1 at a position not less than 5 per square meter or distributed at the node 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;

J. pouring and curing the elastomer resin material: pouring an elastomer resin material into the foam cavity 1 to be cured to form a flexible blank of the flexible pressure plate, wherein the pouring time of the elastomer resin material is 10-13 minutes, the ambient temperature is 20-26 ℃, pouring is started at a pouring hole 4 of a resin pouring head at the lowest position of a mold cavity during pouring, the liquid level of the resin is gradually lifted from low to high, the pouring of the resin 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 the upper surface of the foam cavity at the position by 5CM, the curing is carried out for 160 hours at the room temperature of 20 ℃, and the curing is carried out for 4-8 hours at the temperature of 80 ℃;

K. removing the foam cavity 1: after the elastomer resin poured is completely cured, removing the pouring system, and then removing the foam cavity 1 and the weather-resistant sealant to obtain a blank of the pressure plate; the method specifically comprises the following steps: and removing the pouring system by adopting a metal saw manual sawing mode, and removing the foam cavity 1 and the weather-resistant sealant by adopting a flat shovel.

m, assembling and debugging: and D, assembling the integral material pressing plate prepared in the step L into an upper base plate, carrying out die assembly after static inspection, carrying out on-press debugging after die assembly, and carrying out production 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 block on the pressure plate.

Examples

1. And designing a data model by taking the molded surface of the metal pressure plate as a design reference.

2. A conventional metal pressure plate is divided into a working molded surface and a structural surface through drawing software. The relationship between the working and structural surfaces 2 is: the working molded surface is attached to the structural surface and is directly contacted with the plate in the working process, so that the pressing effect is achieved. The structural surface 2 is arranged below the working molded surface and is provided with a metal base which plays a role in supporting, connecting and fixing the working molded surface. The outer surface of the working molded surface obtained by drawing removal is the same as the molded surface of the metal pressure plate (namely, the drawing removal can be carried out only by the prior metal pressure plate molding, which is equivalent to original edition data in the design process).

3. After the drawing is disassembled, the cavity design is carried out on the working molded surface: the working molded surface is subjected to cavity design through cartia, UG and other mapping software, firstly, the working molded surface is 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 carried out only in the hollow state, and the liquidity of a liquid material in the pouring process of the subsequent working procedure is ensured. In order to ensure that the blank size with the processing condition is obtained after pouring, the size of a hollow area in a cavity needs to be limited, and the space of 20mm is added on the basis of the 'structural surface 2' as a reference, and the space is used as the processing allowance after pouring. The wall thickness of cavity needs to guarantee about 50mm, and the cavity edge needs to wrap up completely and live structural plane 2, and the normal condition parcel is 30mm, makes things convenient for the sealed and bonding of back process. The cavity is designed and manufactured to obtain a blank of the working profile during the casting process.

4. Structural surface 2 design: the structural surface 2 mainly plays a role in supporting, connecting and fixing the working profile. During design, the designed cavity is used as a reference, 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 molded surface part of the structural surface, M5 threaded holes are required to be designed, the distance between every two threaded holes is about 25mm-30mm, and the threaded holes are uniformly distributed on the structural surface 2 to prepare for the subsequent pre-embedded screws.

5. Numerical control machining of a foam cavity 1: and compiling a numerical control machining program according to the designed cavity mathematical model, converting the numerical control machining program into an NC code and using the NC code for numerical control machining. Selecting a whole piece of foam plastic slightly larger than the designed size as a blank for processing the cavity, operating an NC code program, and processing the foam plastic by a numerical control machine tool to obtain a foam cavity 1 real object in accordance with the designed size for later use.

6. Preprocessing a structural surface: the metal base of the pressure plate is obtained by casting polystyrene foam, the structural surface of the pressure plate is in a cast metal form, and two adverse factors exist in the process of use: the dimensional deviation of the cast and molded surface is large, the tight combination of the foam cavity 1 and the structural surface 2 cannot be ensured, and the sealing of the foam cavity 1 and the pressing structural surface is not facilitated. The ash content of impurities in the metal on the cast surface is high, which is not beneficial to the effective bonding of the elastomer resin material and the metal surface.

The processing of the structural surface 2 is similar to that of a foam cavity, and the only difference is that the foam cavity 1 is made of a non-metal material, and the structural surface 2 is made of a metal material.

7. And (3) phosphating the preprocessed structural surface: because the machine tool cooling liquid is often used in the numerical control machining process, the main component of the machine tool cooling liquid is mineral oil, and factors such as oil leakage of part of the machine tool and the like are added, the machined structural surface 2 is often polluted by oil stains, and the elastomer resin material can be fully bonded with the structural surface 2 only by effectively removing the oil stains. The process mainly comprises; the organic solvent is used to remove a large amount of oil stains attached to the structural surface, after the solvent is volatilized, a brush is used to dip a proper amount of 4-in-1 phosphating solution to repeatedly brush the structural surface, further the residual oil stains at the deep part of a casting are removed, and a phosphating film is formed on a processing surface, so that the aim of priming the bonding elastomer resin material is fulfilled.

8. Embedding an anti-drop screw on a structural surface: the flexible pressure plate works in a dynamic environment all the time, the flexible pressure plate is only adhered to the structural surface of the pressure plate by the elastomer resin material, a large risk of separation from the adhering surface exists under the action of external force, in order to effectively reduce the risk of separation, a method of installing a countersunk head screw on the structural surface of a die is needed to increase the connecting strength between the elastomer resin material and the structural surface of the pressure plate, wherein the screw length of an M5-16 countersunk head screw (the strength of standard GB/T819.1 is more than 8.8 grades) is 16mm, the rotary depth is 10mm, and the screw is adhered by using thread anaerobic adhesive when the screw is screwed in. The dovetail-shaped head of the countersunk head screw exposed outside is used for hooking the elastomer resin material for pressing the material, so that the purpose of increasing the firmness is achieved.

9. And (3) performing surface hardening treatment on the foam cavity 1, wherein the foam cavity 1 subjected to numerical control machining cannot be used, 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 cavity needs to be improved in a surface hardening manner. The concrete method comprises the steps of coating epoxy resin or unsaturated resin on the surface of the large-scale foam cavity body to increase the hardness and strength, and additionally, the large-scale foam cavity body 1 needs to be reinforced by adopting glass fiber reinforced plastic materials.

The surface hardening treatment of the foam cavity 1 is also beneficial to the bonding and sealing between the cavity and the structural surface of the mould in the later period.

10. The foam cavity 1 is provided with a pouring exhaust system: the core component of the flexible pressure plate is a flexible pressure surface, and the material is an elastomer resin material which has good fluidity in the initial stage, can be gradually cured along with the change of time and temperature after being mixed, and finally meets the requirement of pressure hardness. The introduction of the material into the foam cavity to form the working profile blank on the mould requires the provision of a casting system for the inflow of the elastomeric resin material into the foam cavity 1. The system comprises;

and (3) casting a head with resin: the main function includes the function of introducing the elastomer resin into the foam chamber 1 and supplementing the shrinkage during the gradual curing of the elastomer resin. The casting head is generally made of hard PVC pipes, the diameter of the casting head is selected between 30mm and 50mm according to the volume of a cavity and a mould, and the casting head is fixed on the foam cavity by adopting weather-resistant glue. The material is distributed at the position not less than 5 per square meter or at the node of the rib plate of the material pressing surface, so that the opening heights of all the pouring systems are basically flush.

An exhaust system: the foam cavity is mainly arranged at the high and narrow parts of the structure of the foam cavity 1, is generally made of 10-12mm transparent PVC pipes and is used for observing the flowing filling condition of elastomer resin materials, removing residual gas in the cavity and ensuring that the elastomer resin can be fully filled in each part of the cavity.

11. Bonding and sealing between the foam cavity 1 and the mold structural surface 2: another key factor in whether the elastomeric resin material can be filled everywhere in the foam cavity 1 is the problem of adhesive sealing between the foam cavity and the structural surface of the mold. Besides the problem of sealing is fully considered in the design stage of the foam cavity 1, a sealant with better performance is selected for sealing in the manufacturing process. At present, a Daokoning 995 type weather-resistant structural sealant is adopted.

12. Elastomer resin material is one of the most core parts in the patent, and the flexible pressing function of the pressing plate can be realized only by correctly selecting the elastomer resin material. Firstly, the material has the characteristics of multiple elements, has better fluidity in the initial stage of independent storage and mixing, has the performance of gradually curing under a certain temperature condition after the materials are fully mixed, and can meet the requirements of hardness and elasticity of a flexible material after being completely cured. Currently, elastomeric resin materials that can meet the above requirements include, see table 1:

TABLE 1

13. Stirring and vacuum defoaming of elastomer materials: the materials are all multi-component materials, and can be poured into the foam cavity 1 to be cured to form a flexible blank of the flexible pressure plate after being accurately proportioned and fully stirred. However, these materials have a considerable amount of air entrained during the mixing process, and if not removed in a timely manner, can form numerous pin-hole-like honeycomb structures within the cured blank, which structures both reduce the hardness of the elastomeric resin material and provide an excellent habitat for oily dirt on the surface of the mold during later use. In order to overcome the problems, a vacuum defoaming link is also needed to be added in the stirring process of the materials; the method comprises the following steps of weighing the multi-component resin materials according to the formula, pouring the multi-component resin materials into a stirrer to be fully stirred and mixed, putting the mixed materials into a vacuum tank, vacuumizing and defoaming for 5 minutes, and taking out the materials for later use. The integral operation time of pouring the elastomer resin material is about 20 minutes, the total time consumption in the stirring and defoaming process cannot exceed 7 minutes, the defoaming time is properly shortened when the temperature is high in summer, and more sufficient time is left for the subsequent resin pouring.

14. Pouring and curing the elastomer resin material: the pouring time of the elastomer resin material is controlled within 10-13 minutes, the ambient temperature is controlled within 20-26 ℃, the ambient temperature is too high, the overlong pouring time means the reduction of the fluidity of the resin, even the initial setting, once the initial setting phenomenon of the elastomer resin material occurs, the elastomer resin material can not be fully filled into all the spaces of the foam cavity, the blank shortage is caused, and the later period needs to be repaired. When the elastomer resin material is poured, pouring must be started at the intersection of the lowest positions of the die cavities, so that the liquid level of the resin is gradually raised from low to high. The liquid level lifting condition of each riser needs to be continuously observed in the resin pouring process, the resin pouring can be stopped when the liquid level of the highest riser or exhaust port exceeds the upper surface of the foam cavity by 5CM, the sealing between the foam cavity and the mold structure surface is not facilitated due to the fact that the pressure is continuously increased due to the fact that the liquid level lifting of the resin is too high, and the point needs to be paid special attention. The elastomer resin material needs a curing temperature and time from initial setting to complete curing, the curing temperature and the curing time are inversely proportional 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. Removing the foam cavity 1: and removing the foam cavity 1 after the elastomer resin which is poured is completely cured, wherein in the process, firstly, a pouring and exhaust system is removed, the pouring and exhaust system can be removed by adopting a metal saw to saw off manually, then, tools such as a flat shovel and the like are adopted to remove the foam cavity 1 and the weather-resistant sealant, the sealant must be completely removed, and otherwise, the processing is influenced. And after the substances are completely removed, the blank of the die pressing plate with the flexible pressing function is manufactured, and the blank can be transferred to a numerical control processing link.

16. Numerical control machining: and after the pouring process, machining the working molded surface by using the programmed machining program. And obtaining a final product which is consistent with the previous design.

17. The assembling/debugging method comprises the following steps: and (4) carrying out static assembly on the manufactured flexible pressure plate, wherein the assembly method and the process are the same as those of the common pressure plate. And (5) closing the die and loading the die to the press after the assembly is finished, and performing dynamic debugging. The debugging method is slightly different from the common pressure plate. Because the working profile of the flexible pressure plate has elasticity, large-area research and distribution 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 block on the pressure plate.

As shown in figure 1, the invention designs an integral model, designs a disassembly drawing, and splits an integral pressure plate into two-part fractional models in software.

As shown in fig. 2, the traditional metal pressing plate is divided into an upper part and a lower part, wherein the upper part is a cavity/working molded surface, the lower part is a metal base/structural surface entity, and the upper part is enlarged according to a certain proportion by the entity to be obtained during design to manufacture the foamed plastic model. The metal base/structural surface entity is designed to ensure the functions of bonding, combining and supporting with the elastomer resin material. After the well-made cavity foam plastic is subjected to chemical treatment, the cavity foam plastic is installed and sealed with the lower structure 2, a hollow cavity is formed after the completion, the cavity does not need to be interfered, and a closed space does not exist inside the cavity, so that the flowability of an elastomer resin material in the pouring process and the size of a blank obtained after pouring are facilitated.

As shown in fig. 3, the elastomer resin material is poured into the cavity after the bonding and sealing, cooled and solidified, and then the foam plastic cavity shell is removed, so as to obtain a blank conforming to the design.

And as shown in fig. 4, after confirming the machining allowance, performing numerical control machining to obtain a complete flexible pressure plate. And finally, assembling the processed integral material pressing plate into the upper bottom plate, and performing static inspection and die assembly. After the die is closed, the debugging on the press is carried out, and the production can be completed after the debugging is finished.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. 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, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A manufacturing method of a cold stamping die pressure plate with a flexible pressure function is characterized by comprising the following steps:

A. the structural design of the pressure plate is as follows: the material pressing plate is composed of a working molded surface and a structural surface (2), wherein the working molded surface takes 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, the gap between the working molded surface and the side surface of the structural surface (2) is 2 mm-4 mm, and a plurality of threaded holes are uniformly distributed in the structural surface (2);

B. numerical control machining of the foam cavity (1): selecting a whole piece of foam plastic slightly larger than the designed size as a blank for processing the cavity, and processing the foam plastic by adopting a numerical control machine tool to obtain a foam cavity (1) real object in accordance with the designed size for later use;

C. preprocessing a structural surface (2): adopting polystyrene foam to cast and prepare a metal base of the pressure plate, namely a structural surface 2;

D. and (3) phosphating the preprocessed structural surface (2): removing oil stains attached to the structural surface (2) by using an organic solvent, dipping a proper amount of 4-in-1 phosphating solution by using a brush after the solvent is volatilized, repeatedly brushing the surface of the structural surface (2), further removing residual oil stains at the deep part of a casting and forming a phosphating film on a processed surface;

E. embedding anti-drop screws on the structural surface (2): mounting a countersunk head screw on the structural surface (2), and hooking an elastomer resin material for material pressing by utilizing a dovetail-shaped head part of the countersunk head screw exposed outside;

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 the inflow of the elastomer resin material is arranged on the foam cavity (1), and comprises a resin casting head and an exhaust pipe;

H. sealing and fixing the foam cavity (1) and the structural surface (2);

J. pouring and curing the elastomer resin material: pouring an elastomer resin material into the foam cavity (1) to be cured to form a flexible blank of the flexible pressure plate, wherein the pouring time of the elastomer resin material is 10-13 minutes, the ambient temperature is 20-26 ℃, pouring is started at a pouring hole (4) of a resin pouring head at the lowest position of a mold cavity during pouring, the liquid level of the resin is gradually raised 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 the upper surface of the foam cavity (1) by 5CM, 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. removing the foam cavity: after the elastomer resin poured is completely cured, removing the pouring system, and then removing the foam cavity (1) and the weather-resistant sealant to obtain a blank of the pressure plate;

2. The manufacturing method of the cold stamping die pressing plate with the flexible pressing function as claimed in claim 1, is characterized in that: and step A, the size of the edge wrapping structure surface of the cavity is 30 mm.

3. The manufacturing method of the cold stamping die pressing plate with the flexible pressing function as claimed in claim 1, is characterized in that: and step A, the distance between every two threaded holes is 25mm-30 mm.

4. The manufacturing method of the cold stamping die pressing plate with the flexible pressing function as claimed in claim 1, is characterized in that: and E, the length of the countersunk head screw is 16mm, and the screwing depth is 10 mm.

5. The manufacturing method of the cold stamping die pressing plate with the flexible pressing function as claimed in claim 1, is characterized in that: and F, for the large foam cavity (1), on the basis of coating epoxy resin or unsaturated resin on the surface of the foam cavity (1), reinforcing the foam cavity by adopting a glass fiber reinforced plastic material.

6. The manufacturing method of the cold stamping die pressing plate with the flexible pressing function as claimed in claim 1, is characterized in that: the resin casting head is used for guiding elastomer resin into the foam cavity (1), and is fixed on the foam cavity (1) by adopting weather-resistant glue; the exhaust pipe is arranged at the high position and the narrow position of the structure 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 to each position of the cavity.

7. The manufacturing method of the cold stamping die pressing plate with the flexible pressing function as claimed in claim 6, wherein: the resin casting head is made of hard PVC pipes, the diameter of the resin casting head is selected between 30mm and 50mm according to the volume of the cavity and the mould, and the resin casting head is distributed on the foam cavity (1) at a position not less than 5 per square meter or distributed at the node of a rib plate of a material pressing surface, so that the opening heights of all casting systems are basically flush; the exhaust system is made of a 10-12mm transparent PVC pipe.

8. The manufacturing method of the cold stamping die pressing plate with the flexible pressing function as claimed in claim 1, is characterized in that: and H, fixing in a bonding, pouring, screw connection or embedding manner.

9. The manufacturing method of the cold stamping die pressing plate with the flexible pressing function as claimed in claim 1, is characterized in that: and K, removing the pouring system by adopting a metal saw manual sawing mode, and removing the foam cavity part and the weather-resistant sealant by adopting a flat shovel.

10. The manufacturing method of the cold stamping die pressing plate with the flexible pressing function as claimed in claim 1, is characterized in that: step M, the debugging process is as follows: the coloring state meeting the use requirement is obtained by adjusting the height of the balance block on the pressure plate.