A hot press forming method

Abstract

The application discloses a hot-pressing forming method, wherein the steps of the hot-pressing forming method comprise: carrying out stereo profiling processing on rubber to be processed to form a stereo profiled rubber strip which is fitted to a die cavity; placing the stereo profiled rubber strip into the die cavity of a hot press; and controlling the hot press to operate according to forming parameters to form a product by hot pressing. The application aims at solving the problem of low production yield of the existing hot-pressing forming process when producing a spatial special-shaped structure product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot pressing forming, in particular to a hot pressing forming method. BACKGROUND

[0002] In the existing rubber hot pressing technology, the structure design of rubber strip raw materials currently still stays in the plane profiling stage. For products of plane structure type, the process requirements can be met, but for products of spatial special-shaped structure, the traditional process has many defects, including that the rubber strip cannot be effectively positioned in the forming process, resulting in rubber strip deviation, many appearance defects, low production yield, serious waste and high cost. SUMMARY

[0003] The main purpose of the present application is to provide a hot pressing forming method, which aims to solve the problem of low production yield of the existing hot pressing forming process in producing products of spatial special-shaped structure.

[0004] To achieve the above purpose, the present application provides a hot pressing forming method, wherein the steps of the hot pressing forming method include:

[0005] The rubber to be processed is subjected to three-dimensional profiling processing to form a three-dimensional profiled rubber strip that fits the mold cavity.

[0006] The three-dimensional profiled rubber strip is placed in the mold cavity of the hot press, and the hot press is controlled to operate at the forming parameters to form the product by hot pressing.

[0007] Optionally, the step of subjecting the rubber to be processed to three-dimensional profiling processing to form a profiled rubber strip that fits the mold cavity includes:

[0008] The rubber to be processed is processed into a plane profiled rubber strip.

[0009] The plane profiled rubber strip is placed in the hot press with a three-dimensional profiling mold pressing tool, and the hot press is controlled to operate at the preforming parameters to form a three-dimensional profiled rubber strip by hot pressing.

[0010] Optionally, the preforming parameters include preforming time a, preforming temperature b and preforming pressure c, and 20s≤a≤40s, 40℃≤b≤60℃ and 5Kg≤c≤20Kg.

[0011] Optionally, the step of processing the rubber to be processed into a plane profiled rubber strip includes:

[0012] The rubber to be processed is processed into a sheet-shaped rubber.

[0013] The sheet-shaped rubber is cut to form a plane profiled rubber strip.

[0014] Optionally, the step of processing the rubber to be processed into a sheet-shaped rubber includes:

[0015] The open mill is controlled to run with preset parameters to open mill the rubber to be processed into sheet rubber.

[0016] Optionally, the preset parameters include an open milling time d and an obtained rubber temperature f, and 10min≤d≤20min, 40℃≤f≤50℃.

[0017] Optionally, the preset parameters include a spacing size e between the rollers of the open mill, and 1mm≤e≤2mm.

[0018] Optionally, the step of cutting the sheet rubber to form the planar profiled rubber strip includes:

[0019] The sheet rubber is placed into a punch press with a profiled setting of a blanking tooling, and the punch press is controlled to punch to form the planar profiled rubber strip.

[0020] Optionally, a weight ratio of the planar profiled rubber strip to the product is k, and 1.5≤k≤2.

[0021] Optionally, the molding parameters include a molding time A, a molding temperature B and a molding pressure C, and 300s≤A≤600s, 160℃≤B≤180℃, 10Kg≤C≤30Kg.

[0022] Optionally, before the step of placing the three-dimensional profiled rubber strip into the mold cavity of the hot press in correspondence, and controlling the hot press to run with the molding parameters to hot-press form the product, the technical scheme further includes a step of:

[0023] Placing a functional element in the mold cavity of the hot press;

[0024] The functional element includes electronic components and / or plastic components.

[0025] In the technical scheme, the rubber to be processed is profiled in three dimensions to form the three-dimensional profiled rubber strip, which can better fit the mold cavity of the spatial special-shaped structure product, is convenient for positioning, avoids deviation of the three-dimensional profiled rubber strip in the processing process, and can ensure consistency of differences between thicknesses of the three-dimensional profiled rubber strip and actual thicknesses of the product when the three-dimensional profiled rubber strip is formed, so as to ensure balanced flow of rubber in each part of the three-dimensional profiled rubber strip during hot pressing, solve product appearance defects such as material shortage, gas entrapment, shrinkage and overflow caused by uneven product thickness and inconsistent rubber filling rate in the traditional process, and improve production yield. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in the drawings without any creative effort.

[0027] Figure 1 The flowchart of the first embodiment of the hot-press forming method provided by the present application;

[0028] Figure 2 The flowchart of the second embodiment of the hot-press forming method provided by the present application;

[0029] Figure 3 The flowchart of the third embodiment of the hot-press forming method provided by the present application;

[0030] Figure 4 The flowchart of the fourth embodiment of the hot-press forming method provided by the present application;

[0031] Figure 5 The flowchart of the fifth embodiment of the hot-press forming method provided by the present application;

[0032] Figure 6 The flowchart of the sixth embodiment of the hot-press forming method provided by the present application;

[0033] Figure 7 The planar flowchart and structural diagram of the rubber mixing mill for mixing the rubber to be processed provided by the present application;

[0034] Figure 8 The planar diagram of the blanking tooling provided by the present application;

[0035] Figure 9 The three-dimensional diagram of the planar profiled rubber strip provided by the present application;

[0036] Figure 10 The planar flowchart and structural diagram of the planar profiled rubber strip for forming the three-dimensional profiled rubber strip by hot-pressing provided by the present application;

[0037] Figure 11 The three-dimensional exploded diagram of the product after hot-press forming and the mold provided by the present application.

[0038] Explanation of the reference signs:

[0039] Reference Name Reference Name 1 Rubber to be processed 6 Roller 2 Flat profiled rubber strip 7 Blanking tooling 3 Sheet rubber 8 Mould 4 Solid profiled rubber strip 9 Product 5 Solid profiled moulding tooling

[0040] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0042] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0043] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes A solution, or B solution, or A and B solutions. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it. When the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection claimed by the present application.

[0044] In the existing rubber hot pressing technology, the structure design of the rubber strip raw material currently still stays in the plane profiling stage, which can meet the process requirements for products of plane structure type, but for products of spatial special-shaped structure, the traditional process has many defects, including that the rubber strip cannot be effectively positioned in the forming process, resulting in deviation of the rubber strip and many appearance defects, etc., so that the production yield is low, the waste is serious, and the cost is high.

[0045] In view of this, the present application provides a hot pressing forming method, Figures 1 to 6 The embodiments of the hot pressing forming method provided by the present application will be described below in combination with specific drawings.

[0046] Please refer to Figures 1 to 11 The steps of the hot pressing forming method include:

[0047] S10: The rubber to be processed 1 is subjected to three-dimensional profiling processing to form a three-dimensional profiled rubber strip 4 that fits the cavity of the mold 8;

[0048] S20: Corresponding the stereoscopic profiled rubber strip 4 into the cavity of the mold 8 of the hot press, and controlling the hot press to operate according to the molding parameters, so as to form the product 9 by hot pressing.

[0049] In the technical solution of the present application, the rubber to be processed 1 is processed by stereoscopic profiling to form the stereoscopic profiled rubber strip 4. Compared with the prior art of placing the rubber to be processed 1 into the cavity after planar profiling and then hot pressing, the stereoscopic profiled rubber strip 4 can better fit the cavity of the mold 8 of the spatial special-shaped structure product 9, facilitate positioning, avoid deviation of the stereoscopic profiled rubber strip 4 during processing, and ensure consistency of the thickness difference of the stereoscopic profiled rubber strip 4 at all positions and the actual thickness of the product 9 when forming the stereoscopic profiled rubber strip 4, so as to ensure the balance of the rubber flow at all positions of the stereoscopic profiled rubber strip 4 during hot pressing, solve the appearance defects of the product 9 caused by uneven thickness of the product 9 and inconsistent rubber filling rate in the traditional process, such as material shortage, gas entrapment, shrinkage, and overflow, and improve the production yield.

[0050] Specifically, the step S10 comprises:

[0051] S11: processing the rubber to be processed 1 into a planar profiled rubber strip 2;

[0052] S12: placing the planar profiled rubber strip 2 into the hot press with the stereoscopic profiled mold pressing tool 5, and controlling the hot press to operate according to the pre-preparation parameters, so as to form the stereoscopic profiled rubber strip 4 by hot pressing.

[0053] Before the stereoscopic profiled rubber strip 4 is processed, the prior art of the planar profiled rubber strip 2 is adopted to improve the molding yield of the stereoscopic profiled rubber strip 4 as much as possible. Since the stereoscopic profiled rubber strip 4 is a pre-positioned semi-finished product of the product 9, its thickness and weight must be greater than those of the product 9 to reserve a certain processing allowance for hot pressing of the product 9. At this time, the planar profiled rubber strip 2 is used for processing the stereoscopic profiled rubber strip 4. Although the molding precision is low as mentioned in the present application, on the basis of reserving a large processing allowance, it does not need to consider the disadvantage of low molding yield, but only needs to consider the advantage of saving material by profiling to reduce cost. That is, compared with directly using a planar rubber strip to process the stereoscopic profiled rubber strip 4, the planar profiled rubber strip 2 can fit the planar structure of the special-shaped product 9, and reduce the material waste of the planar rubber strip at the positions other than the product 9.

[0054] It should be noted that the weight ratio of the planar profiled rubber strip 2 to the product 9 is k, and 1.5≤k≤2 in the present application. On the basis of reserving a processing allowance, the overflow amount during hot pressing and the pressure in the hot pressing cavity are controlled to control the flow of the rubber and ensure the balance of the pressure, thereby improving the molding quality of the product 9.

[0055] Specifically, referring to Figures 9 to 10 For the structural embodiment of the planar profiled rubber strip 2 and the process of hot-pressing the planar profiled rubber strip 2 into the three-dimensional profiled rubber strip 4 proposed in the present application, the planar profiled rubber strip 2 is placed in the three-dimensional profiled mold tool 5, and the three-dimensional profiled mold tool 5 is heated and closed by controlling the hot press, so as to profile the planar profiled rubber strip 2 into the three-dimensional profiled rubber strip 4. When the three-dimensional profiled rubber strip 4 is taken out, the excess glue on the edge of the three-dimensional profiled rubber strip 4 is removed. At this time, the size and thickness of the three-dimensional profiled rubber strip 4 are further reduced compared with the planar profiled rubber strip 2, and the three-dimensional profiled rubber strip 4 is closer to the product 9, so as to facilitate the hot-pressing of the product 9 and reduce the amount of glue overflow during the hot-pressing of the product 9 to improve the forming quality of the product 9. It can be understood here that the three-dimensional profiled rubber strip 4 needs to have a certain processing allowance, so the size of the cavity of the three-dimensional profiled mold tool 5 is larger than the size of the mold 8, and the precision of the mold 8 can be set to be poor to reduce the cost. In addition, the hot press for hot-pressing the planar profiled rubber strip 2 and the hot press for hot-pressing the three-dimensional profiled rubber strip 4 can be the same or different, which is not limited here, and is mainly based on the actual processing environment. Obviously, using the same hot press needs to replace the mold 8 for forming the product 9 and the three-dimensional profiled mold tool 5 for the three-dimensional profiled rubber, which is time-consuming and laborious. In the present application, different hot presses are used for processing to improve the processing efficiency.

[0056] Further, the pre-preparation parameters include a pre-preparation time a, a pre-preparation temperature b and a pre-preparation pressure c, and 20s≤a≤40s, 40℃≤b≤60℃, 5Kg≤c≤20Kg. When the stereoscopic profiled rubber strip 4 is hot-pressed to form the product 9, the forming parameters include a forming time A, a forming temperature B and a forming pressure C, 300s≤A≤600s, 160℃≤B≤180℃, 10Kg≤C≤30Kg. It can be understood that the stereoscopic profiled rubber strip 4 requires lower precision but higher processing efficiency when hot-pressed to form the product 9, so the stereoscopic profiled rubber strip 4 is rapidly formed by setting a shorter processing time, a lower processing temperature and a smaller average pressure, specifically, the processing time is set to 20s, the processing temperature is set to 50℃, and the processing pressure is set to 5Kg, which can make the stereoscopic profiled rubber strip 4 form and meet the process requirements. The temperature required for hot-pressing the stereoscopic profiled rubber strip 4 to form the product 9 is 160 to 180℃, the pressure required is 10 to 30Kg, and the heating time required is 300s to 600s, which on the one hand guarantees the forming quality of the product 9, and on the other hand vulcanizes the product 9 to guarantee the vulcanization effect. In addition, since the stereoscopic profiled rubber strip 4 is hot-pressed to form the product 9, the thickness of the stereoscopic profiled rubber strip 4 and the product 9 is small and uniform, compared with the traditional direct forming of the planar profiled rubber strip 2, the thickness of the planar profiled rubber strip 2 at some positions is greatly different from that of the product 9, thereby reducing the hot-pressing time, improving the forming efficiency of the product 9, and reducing the forming cycle of the product 9.

[0057] Specifically, the step S11 includes:

[0058] S13: processing the rubber to be processed 1 into a sheet-shaped rubber 3;

[0059] S14: cutting the sheet-shaped rubber 3 to form a planar profiled rubber strip 2.

[0060] Based on the actual shape of the rubber to be processed 1, when the rubber to be processed 1 is the sheet-shaped rubber 3, the planar profiled rubber strip 2 can be directly cut, and when the rubber to be processed 1 is a rubber raw material that is more initial in the process flow, the rubber to be processed 1 needs to be processed into the sheet-shaped rubber 3, and then the planar profiled rubber strip 2 is formed by profiled cutting.

[0061] Further, the step S14 includes:

[0062] S15: placing the sheet-shaped rubber 3 into a punch press with a profiled setting of a blanking tooling 7, and controlling the punch press to cut to form a planar profiled rubber strip 2.

[0063] The cutting method of the sheet rubber 3 to form the flat profiled rubber strip 2 can be various, including but not limited to manual cutting, mechanical edge searching cutting, etc., which can be referred to Figure 8 The present application uses the blanking tooling 7 and the punch to uniformly blank the bulk sheet rubber 3, which has good cutting effect and high efficiency.

[0064] In addition, the step S13 includes:

[0065] S16: Control the open mill to run at a preset parameter to open the rubber to be processed 1 into sheet rubber 3.

[0066] According to the properties of the rubber to be processed 1, the open mill in the present application is used to open the rubber to be processed 1, so that the raw fluorine rubber is repeatedly folded and rolled between the rollers 6 of the open mill to stimulate the molecular activity of the fluorine rubber itself, soften the raw rubber, reduce the material viscosity, and facilitate subsequent mold pressing. Specifically, to achieve the required properties of the sheet rubber 3, the open mill process in the present application is completed at room temperature, i.e. the ambient temperature is 25 degrees Celsius, the open mill time is set to 10 to 20 minutes, and the rubber to be processed 1 is opened to 40 to 50 degrees Celsius. At the same time, the interval between the rollers 6 of the open mill in the present application is set to 1 to 2 millimeters to meet the rolling requirements of the rubber to be processed 1 and the thickness size of the sheet rubber 3.

[0067] In addition, before the step S20, it also includes the step:

[0068] S21: Place the functional element in the mold 8 cavity of the hot press;

[0069] The functional element includes electronic components and / or plastic components.

[0070] For parts of the product 9 that need to be integrally provided with electronic components and / or plastic components, electronic components and / or plastic components can be added after the product 9 is formed, but obviously the operation is troublesome and the structure design of the product 9 is more complex. In the present application, the required electronic components and / or plastic components are directly fixed and placed in the cavity of the mold 8, so that the electronic components and / or plastic components are integrally formed with the product 9 when the product 9 is hot-pressed, on the one hand, no subsequent installation operation is needed, on the other hand, no installation structure needs to be provided on the product 9, and on the other hand, the electronic components and / or plastic components are integrally formed with the product 9, which is stable in structure.

[0071] The above merely describes the preferred embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structural changes made according to the content of the present application specification and drawings, or direct / indirect application in other related technical fields, are included in the patent protection scope of the present application.

Claims

1. A hot press molding method for the production of a rubber product, characterized by, The steps of the hot press forming method include: The rubber to be processed is subjected to stereo profiling processing to form a stereo profiled rubber strip that fits the mold cavity; The stereo profiled rubber strip is placed in the mold cavity of the hot press, and the hot press is controlled to operate at the forming parameters to form the product by hot pressing; The thickness of the stereo profiled rubber strip is greater than the thickness of the product, and the thickness difference of the relative position of the stereo profiled rubber strip and the product is consistent. The step of processing the rubber to be processed into a plane profiled rubber strip includes: The rubber to be processed is processed into a plane profiled rubber strip; The plane profiled rubber strip is placed in the hot press with a stereo profiled mold pressing tooling, and the hot press is controlled to operate at the preforming parameters to form a stereo profiled rubber strip by hot pressing.

2. The hot press forming method according to claim 1, characterized by, The preforming parameters include preforming time a, preforming temperature b, and preforming pressure c, and 20s≤a≤40s, 40℃≤b≤60℃, and 5Kg≤c≤20Kg.

3. The hot press forming method according to claim 1, characterized by, The step of processing the rubber to be processed into a plane profiled rubber strip includes: The rubber to be processed is processed into a sheet-shaped rubber; The sheet-shaped rubber is cut to form a plane profiled rubber strip.

4. The hot press forming method according to claim 3, characterized by, The step of processing the rubber to be processed into a sheet-shaped rubber includes: The open mill is controlled to operate at the preset parameters to open mill the rubber to be processed into a sheet-shaped rubber.

5. The hot press forming method according to claim 4, characterized by, The preset parameters include open mill time d and the obtained rubber temperature f, and 10min≤d≤20min, 40℃≤f≤50℃.

6. The hot press molding method according to claim 4, wherein The preset parameters include the interval size e between the rollers of the open mill, and 1mm≤e≤2mm.

7. The hot press forming method according to claim 3, characterized by, The step of cutting the sheet-shaped rubber to form a plane profiled rubber strip includes: The sheet-shaped rubber is placed in the punch press with a profiled setting of the blanking tooling, and the punch press is controlled to punch to form a plane profiled rubber strip.

8. The hot press forming method according to claim 1, characterized by, The weight ratio of the plane profiled rubber strip to the product is k, and 1.5≤k≤2.

9. The hot press forming method according to claim 1, characterized by, The forming parameters include forming time A, forming temperature B, and forming pressure C, and 300s≤A≤600s, 160℃≤B≤180℃, and 10Kg≤C≤30Kg.

10. The hot press forming method according to claim 1, characterized by, Before the step of placing the stereo profiled rubber strip in the mold cavity of the hot press, controlling the hot press to operate at the forming parameters to form the product by hot pressing, the method further includes the step of: Placing a functional element in the mold cavity of the hot press; The functional element includes electronic components and / or plastic components.

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