A rubber molding mold and a rubber molding process

Abstract

The application relates to the technical field of rubber production, and provides a rubber forming die and a rubber forming process, which comprise an upper die plate, a middle die plate and a lower die plate. One side of the upper die plate is provided with a plurality of displacement portions for forming through holes on a product; one side of the middle die plate facing the upper die plate is provided with a forming groove, the upper die plate is pressed on one side of the middle plate provided with the forming groove, one side of the middle die plate located at the bottom of the forming groove is provided with a plurality of waste holes, and the end of the displacement portion is located at one end of the waste hole close to the bottom of the forming groove; and one side of the lower die plate facing the middle die plate is provided with a plurality of filling portions opposite to the displacement portions, the filling portions are correspondingly inserted into the waste holes, and gaps exist between the outer wall of the filling portion and the hole wall of the waste hole and form a burr cavity. Based on the application, burrs generated during the forming of rubber products can be conveniently treated, and the labor cost can be saved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of rubber production, in particular to a rubber forming die and a rubber forming process. BACKGROUND

[0002] At present, there are two forming processes for silica gel, the first one is a silica gel mold pressing process, the material is placed in the cavity after the mold is opened, and then the mold is closed and formed by pressure and heating; the second one is that the mold is closed to form a mold cavity, and the material is injected into the mold cavity through a flow channel by a shooting system and then formed.

[0003] For the related technologies in the above, the second shooting mode can achieve a state of no burr, but the development cost of the mold is high, so it is only suitable for large quantities of high-quality products. The first process has burr problems because the mold is closed after the material is put in, and the burr is generated at the parting line (also known as the parting line) of the mold, so the silica gel product after opening the mold needs to be torn at the parting line. The burr is usually cleaned by manual work after the product is formed, especially when the number of through holes on the product is large, which results in high labor cost. SUMMARY

[0004] In order to facilitate the processing of the burr of the rubber product during forming and save labor cost, the application provides a rubber forming die and a rubber forming process.

[0005] In the first aspect, the application provides a rubber forming die, which adopts the following technical scheme:

[0006] A rubber forming die, comprising an upper die plate, one side of the upper die plate is provided with a plurality of accommodation portions for forming through holes on the product; a middle die plate, one side of the middle die plate facing the upper die plate is provided with a forming groove, the upper die plate is pressed on the side of the middle plate provided with the forming groove, one side of the middle die plate located at the bottom of the forming groove is provided with a plurality of waste holes, and the end of the accommodation portion is located at one end of the waste hole close to the bottom of the forming groove; a lower die plate, the lower die plate is pressed on the side of the middle die plate away from the upper die plate, the lower die plate is provided with a plurality of filling portions opposite to the accommodation portions on the side facing the middle die plate, each filling portion is inserted into each waste hole, and the gap between the outer wall of the filling portion and the hole wall of the waste hole forms a burr cavity.

[0007] By adopting the technical scheme, during production, the rubber material is placed in the forming groove, and then the upper mold plate, the middle mold plate and the lower mold plate are pressed together for pressure and heating forming; the product is formed in the forming groove, and the accommodation portion can form a through hole on the product; the filling portion is inserted into the waste hole and has a gap, so that part of the rubber material enters the burr cavity from the gap between the end of the accommodation portion and the middle mold plate to form a burr; after forming, the upper mold can be opened, and the product can be directly taken out from the middle mold plate; since the end of the accommodation portion is located at the end of the waste hole close to the bottom of the forming groove, the end of the accommodation portion can basically block the end of the waste hole, that is, the communication gap between the waste hole and the forming groove is small, so that the rubber material can enter the burr cavity; since the communication gap is small, the connection part between the product and the burr has small strength, so the burr is clamped in the burr cavity between the outer wall of the filling portion and the hole wall of the waste hole, and the product and the plurality of burrs are directly separated by the scheme; then the middle plate is opened, and the waste edge is cleaned to facilitate the processing of the burr during the forming of the rubber product, and the labor cost is saved.

[0008] Preferably, the shape of the end of the accommodation portion close to the waste hole is matched with the waste hole close to the end.

[0009] By adopting the technical scheme, the accommodation portion can cover the waste hole, the rubber material can enter the waste hole to form a burr during heating and pressing, and the connection strength between the burr and the product is smaller, so that the product and the burr are separated during the product is taken out.

[0010] Preferably, a plurality of through grooves are arranged on the side of the middle mold plate facing the lower mold plate, the two ends of each through groove are communicated with two adjacent waste holes respectively, and each waste hole is communicated with each other through the through grooves.

[0011] By adopting the technical scheme, the through grooves can communicate each waste hole together on the side of the middle mold plate facing the lower mold plate, the rubber material entering the waste hole can enter the through grooves and then connect the burrs in the adjacent two waste holes into one, so that the burrs in each waste hole are cleaned.

[0012] Preferably, the gap gradually increases from the middle mold plate towards the lower mold plate.

[0013] By adopting the technical scheme, when the product is taken out, the burr is not easy to separate from the product together from the gap between the end of the accommodation portion and the bottom of the forming groove, so that the burr is clamped in the gap, and the separation of the burr and the product is better.

[0014] Preferably, the cross-sectional area of the waste hole gradually increases from the middle mold plate towards the lower mold plate, and the filling portion is a columnar body with equal cross sections.

[0015] By adopting the technical scheme, the cross-sectional area of the waste hole gradually increases, and the cross-sectional outer contour of the filling part remains unchanged, so that the gap between the outer wall of the filling part and the hole wall gradually increases from the middle mold plate to the lower mold plate.

[0016] Preferably, the lower mold plate is provided with a displacement slot on the side away from the middle mold plate, each waste hole is communicated with the displacement slot, the lower mold plate is provided with a protrusion on the side facing the middle mold plate, the protrusion is inserted into the displacement slot and matched with the displacement slot, the filling part is arranged on the side of the protrusion facing the bottom of the displacement slot, and the height of the filling part is less than the height of the protrusion.

[0017] By adopting the technical scheme, when the middle mold plate and the lower mold plate are pressed together, although the filling part enters the displacement slot first and then enters the waste hole, the protrusion can be matched with the displacement slot and clamped in first when the filling part enters the waste hole, so that the installation position of the protrusion is aligned, and the plurality of filling parts can accurately enter the waste hole; in addition, the distance between the end of the waste hole close to the lower mold plate and the outer circumferential side of the lower mold plate and the middle mold plate can be increased, and the overflow of the rubber material from the gap between the outer circumferential sides of the lower mold plate and the middle mold plate can be reduced.

[0018] Preferably, one end of the filling part is attached to the displacement part, and there is a gap between the outer circumferential side of the end of the filling part close to the displacement part and the hole wall of the waste hole.

[0019] By adopting the technical scheme, when the rubber material is pressurized and heated, it can enter the burr cavity from the gap; at the same time, one end of the filling part is attached to the displacement part, so that the burr is not formed between the opposite filling part and displacement part, thereby reducing the connection strength between the burr and the product.

[0020] Preferably, the side of the filling part and the side of the displacement part attached to each other are both flat.

[0021] By adopting the technical scheme, the filling part and the displacement part can be more closely attached through the attachment of the flat, so as to better reduce the gap between the filling part and the displacement part.

[0022] Preferably, the displacement part comprises a plurality of main blocks and a plurality of shaping columns, each main block is fixed on the side of the upper mold plate facing the middle mold plate, and each shaping column is fixed on the side of the main block facing the middle mold plate, and the end of the shaping column away from the main block is located at the end of the waste hole close to the bottom of the forming groove.

[0023] By adopting the technical scheme, the main block can form a groove on the product, and the shaping column can form a through hole at the position of the product on the groove bottom.

[0024] In a second aspect, the rubber forming mold of the rubber mold provided by the application has the technical scheme as follows:

[0025] A rubber forming process of the rubber forming mold, comprising: adding rubber material into the middle mold plate, closing the upper mold plate, the middle mold plate and the lower mold plate, and starting the pressurized and heated forming; during the forming, the displacement part forms a through hole on the product, and the rubber material forms a burr in the waste hole; opening the upper mold plate, taking out the formed product, and the burr is clamped in the waste hole, so that the product is directly separated from the burr, and then the burr remaining in the mold is cleaned to form the next product.

[0026] By adopting the above technical scheme, after the pressurized and heated forming, the upper mold plate is opened, and then the product is taken out, since the burr is formed in the waste hole, the burr is clamped in the waste hole, the product is directly separated from the burr, and then the burr remaining in the mold is cleaned, thereby saving the labor cost.

[0027] In summary, the application has at least one of the following beneficial technical effects:

[0028] (1) By setting the cooperation between the upper mold plate, the middle mold plate, the lower mold plate, the displacement part, the forming groove, the filling part and the waste hole, the burr can be formed in the burr cavity, and the product and the burr can be directly separated when the product is taken out, so that only the burr on the mold needs to be cleaned, thereby achieving the effect of conveniently processing the burr during the forming of the rubber product and saving the labor cost;

[0029] (2) By setting the cooperation between the protrusion and the displacement groove, the plurality of filling parts can be quickly clamped into the waste hole, and the overflow of the rubber material from the peripheral side gap between the lower mold plate and the middle mold plate is reduced;

[0030] (3) By setting the communication groove, the burrs in the plurality of waste holes can be connected with each other, and the burrs in the plurality of waste holes can be conveniently cleaned. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural schematic view of the formed product of the embodiment;

[0032] Figure 2 is a structural schematic view of the rubber forming mold of the embodiment;

[0033] Figure 3 is an exploded structural schematic view of the rubber forming mold of the embodiment;

[0034] Figure 4 is Figure 2 is a sectional view of A-A of the middle mold plate;

[0035] Figure 5 is Figure 4 is an enlarged view of the local B part in

[0036] Figure 6 is a structural schematic view of the fitting surface of the upper die plate and the lower die plate in this embodiment;

[0037] Figure 7 is Figure 6 is an enlarged view of the local C part in

[0038] Figure 8 is a structural schematic view of the burr in this embodiment.

[0039] Reference signs: 1, dish; 2, groove; 3, upper die plate; 4, middle die plate; 5, lower die plate; 6, accommodation part; 61, main block; 62, shaping column; 7, shaping groove; 8, waste hole; 9, filling part; 10, burr cavity; 11, through groove; 12, accommodation groove; 13, protruding block. DETAILED DESCRIPTION

[0040] The following will be combined with the accompanying Figures 1-8 Further detailed description will be given to the present application.

[0041] The present embodiment discloses a rubber forming die. Referring to Figure 1 , the product formed by the present rubber forming die is a dish 1, four grooves 2 are formed on the upper surface of the dish 1 at intervals, and a plurality of through holes are formed at the bottom of the grooves 2.

[0042] Referring to Figure 2 and Figure 3 , the rubber forming die comprises an upper die plate 3, a middle die plate 4 and a lower die plate 5 connected by pressing, the middle die plate 4 is located between the upper die plate 3 and the lower die plate 5 during the molding process; a plurality of accommodation parts 6 are arranged on the side of the upper die plate 3 which is fitted to the middle die plate 4, and the accommodation parts 6 are used for forming the through holes on the product. Moreover, the rubber forming die can be used for injection molding of some plastic and rubber materials.

[0043] Specifically, referring to Figure 3 and Figure 4The giving part 6 includes a plurality of main blocks 61 and a plurality of shaping columns 62, each main block 61 is in the shape of a rectangular plate and is fixedly attached to one side of the upper mold plate 3 facing the middle mold plate 4, and each shaping column 62 is fixedly attached to one side of the main block 61 facing the middle mold plate 4; in this embodiment, the cross section of the shaping column 62 is in the shape of a hexagon, and in other embodiments, the shapes of the shaping column 62 and the main block 61 can be selected according to the shape of the groove 2 and the hole of the product. A forming groove 7 is formed on one side of the middle mold plate 4 facing the upper mold plate 3, the giving part 6 is located in the forming groove 7, and the end of the shaping column 62 away from the main block 61 is located at one end of the waste hole 8 close to the groove bottom of the forming groove 7, and the forming groove 7 and the giving part 6 cooperate to form a forming cavity for forming the plate 1. The main block 61 is used to form the groove 2 on the plate 1, and the shaping column 62 is used to form the hole that penetrates the plate 1 at the position of the groove bottom of the groove 2.

[0044] A plurality of waste holes 8 are formed on one side of the middle mold plate 4 at the groove bottom of the forming groove 7, each waste hole 8 is arranged opposite to the shaping column 62, the end of the shaping column 62 is located at one end of the waste hole 8 close to the groove bottom of the forming groove 7, the end face of one end of the shaping column 62 is flush with the surface where the groove bottom of the forming groove 7 is located, and the shape of the end of the shaping column 62 is the same as the shape of one end of the waste hole 8 close to the groove bottom of the forming groove 7, that is, the shape of the end of the shaping column 62 close to the waste hole 8 is adapted to the waste hole 8 close to it, which ensures that the shaping column 62 just blocks one end of the waste hole 8, so that the connecting gap between the waste hole 8 and the forming groove 7 is small, which can reduce the connecting strength of the burr and the product, and facilitate the separation of the product and the burr.

[0045] Referring to Figure 3 and Figure 5 A plurality of filling parts 9 are fixedly attached to one side of the lower mold plate 5 facing the middle mold plate 4, each filling part 9 is in the shape of a column with a constant cross section, in this embodiment, the filling part 9 is a hexagonal prism, the cross-sectional shape of the shaping column 62 is the same as that of the filling part 9, and each shaping column 62 is opposite to and attached to the end of each filling part 9; the filling part 9 is correspondingly inserted into each waste hole 8, and there is a gap between the outer wall of the filling part 9 and the hole wall of the waste hole 8, and the gap forms a burr cavity 10; when the rubber material is heated and pressurized, the rubber material enters the burr cavity 10 from the gap between the end of the shaping column 62 and the groove bottom of the forming groove 7 and forms a burr. One end of the filling part 9 is attached to the end face of the shaping column 62, and the surface where the filling part 9 and the shaping column 62 are attached to each other is a plane, which reduces the gap between the attachment parts of the filling part 9 and the shaping column 62; and the cross-sectional area of the filling part 9 is slightly smaller than that of the shaping column 62, so that there is a gap between the outer circumferential side of one end of the filling part 9 close to the giving part 6 and the hole wall of the waste hole 8, and when the rubber material enters the burr cavity 10, it is not easy to form in the gap between the attachment parts of the filling part 9 and the shaping column 62, but directly enters the burr cavity 10 from the gap.

[0046] When the product is taken out from the mold, since the communication gap between the end of the shaping column 62 and the bottom of the forming groove 7 is small, the flash is not easy to pass through the gap from the flash cavity 10 into the forming groove 7 and be demolded together with the product, so when the product is pulled out of the forming groove 7, the flash is clamped in the flash cavity 10, realizing the direct separation of the product and the flash.

[0047] In some embodiments, the aperture gradually increases from the middle mold plate 4 towards the lower mold plate 5, specifically, the cross-sectional area of the waste hole 8 gradually increases from the middle mold plate 4 towards the lower mold plate 5, since the cross-section of the filling part 9 remains unchanged, the aperture gradually increases from the middle mold plate 4 towards the lower mold plate 5, and the flash after forming is a conical frustum with hollow axis part. Therefore, when the upper mold is opened and the product is taken out, the flash will be clamped in the flash cavity 10, reducing the flash being taken out of the flash cavity 10 together with the product, so that the flash and the product are better separated. When cleaning the flash, the middle mold plate 4 and the lower mold plate 5 are separated.

[0048] Referring to Figure 6 and Figure 7 In some embodiments, one side of the middle mold plate 4 towards the lower mold plate 5 is provided with a plurality of through grooves 11, both ends of the through groove 11 respectively communicate with two adjacent waste holes 8, and each waste hole 8 communicates with each other through the through groove 11.

[0049] Referring to Fig. 3 and Figure 7 When the rubber material enters the flash cavity 10 and fills the flash cavity 10, the rubber material can enter the through groove 11 to connect the flash of each flash cavity 10 into a whole, facilitating the simultaneous cleaning of multiple conical frustums of flash from the middle mold plate 4 or the lower mold plate 5.

[0050] In some embodiments, referring to Fig. 3 and Figure 6 , the side of the lower mold plate 5 away from the middle mold plate 4 is provided with a displacement groove 12, the displacement groove 12 is a rectangular groove, one end of each waste hole 8 away from the middle mold plate 4 communicates with the displacement groove 12, the side of the lower mold plate 5 towards the middle mold plate 4 is fixed with a protruding block 13, the protruding block 13 is a rectangular block matched with the displacement groove 12, the protruding block 13 is inserted into the displacement groove 12, the filling part 9 is fixed to the side of the protruding block 13 towards the bottom of the displacement groove 12, and the height of the filling part 9 is less than the height of the protruding block 13.

[0051] The implementation principle of the rubber forming mold of the embodiment of the application is as follows: the rubber material is placed in the forming groove 7, and then the upper mold plate 3, the middle mold plate 4 and the lower mold plate 5 are closed and heated and pressed. After the rubber material is filled in the forming groove 7, part of the rubber material enters the burr cavity 10 from the gap between the forming column and the groove bottom of the forming groove 7, and the rubber material also enters the through groove 11 after filling the burr cavity 10, so that the burr part in the through groove 11 can connect the burrs in each waste hole 8 into a whole. After the product is formed, the upper mold plate 3 is opened, and the formed product is taken out. Since the gap between the shaping column 62 and the groove bottom of the forming groove 7 is small, the burr is clamped in the burr cavity 10, so that the product is individually demolded, the burr and the product are separated, manual cleaning of the burr of the product is not needed, and the effect of conveniently processing the burr during rubber product forming and saving labor cost is achieved.

[0052] Finally, the middle mold plate 4 is opened, and the middle mold plate 4 is separated from the lower mold plate 5, the burr adhered to the middle mold plate 4 or the lower mold plate 5 is cleaned, and the next product forming is performed.

[0053] The embodiment of the application also discloses a rubber forming process for the rubber forming mold. Figure 3 and Figure 8 The rubber forming process comprises the following steps: the rubber material is added into the middle mold plate 4, the upper mold plate 3, the middle mold plate 4 and the lower mold plate 5 are closed, and the pressure and heating forming is started; during the forming, the gap part 6 forms a through hole on the product, and the rubber material forms a burr in the waste hole 8. The upper mold plate 3 is opened, and the formed product is taken out, and the burr is clamped in the waste hole 8, so that the product is individually demolded, the burr and the product are separated; the middle mold plate 4 is opened, and the middle mold plate 4 is separated from the lower mold plate 5, the burr adhered to the middle mold plate 4 or the lower mold plate 5 is cleaned, and the next product forming is performed.

[0054] The above are the preferred embodiments of the application, and do not limit the protection scope of the application, so: equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A rubber molding die, characterized in that, include, The upper template (3) has a plurality of clearance portions (6) on one side, which are used for forming through holes on the product. The middle template (4) has a forming groove (7) on the side facing the upper template (3). The upper template (3) is pressed against the side of the middle template with the forming groove (7). The middle template (4) has several waste holes (8) on the side of the middle template (4) located at the bottom of the forming groove (7). The end of the clearance part (6) is located at the end of the waste hole (8) near the bottom of the forming groove (7). The lower template (5) is pressed against the side of the middle template (4) away from the upper template (3). The side of the lower template (5) facing the middle template (4) is provided with a plurality of filling parts (9) opposite to the relief part (6). The filling parts (9) are correspondingly inserted into each of the waste holes (8). There is a gap between the outer wall of the filling part (9) and the hole wall of the waste hole (8) to form a rough edge cavity (10). The end shape of the clearance portion (6) near the waste hole (8) is adapted to the waste hole (8) it is near; The middle template (4) has several through slots (11) on the side facing the lower template (5). The two ends of the through slots (11) are respectively connected to two adjacent waste holes (8), and each waste hole (8) is connected to each other through the through slots (11). The pores gradually increase from the middle template (4) toward the lower template (5).

2. The rubber molding die according to claim 1, characterized in that, The cross-sectional area of ​​the waste hole (8) gradually increases from the middle template (4) toward the lower template (5), and the filling part (9) is a column with a uniform cross-section.

3. The rubber molding die according to claim 1, characterized in that, One side of the middle template (4) is provided with a relief groove (12), and each of the waste holes (8) is connected to the relief groove (12). The side of the lower template (5) facing the middle template (4) is provided with a protrusion (13). The protrusion (13) is inserted into the relief groove (12) and is adapted to the relief groove (12). The filling part (9) is provided on the side of the protrusion (13) facing the bottom of the relief groove (12). The height of the filling part (9) is less than the height of the protrusion (13).

4. A rubber molding die according to claim 1, characterized in that, One end of the filling part (9) is attached to the relief part (6), and there is a gap between the outer periphery of the end of the filling part (9) near the relief part (6) and the hole wall of the waste hole (8).

5. A rubber molding die according to claim 4, characterized in that, The surfaces on which the filling part (9) and the vacating part (6) fit together are both flat.

6. A rubber molding die according to claim 1, characterized in that, The clearance part (6) includes several main blocks (61) and several shaping columns (62). Each main block (61) is fixed at intervals on the side of the upper template (3) facing the middle template (4). Each shaping column (62) is fixed on the side of the main block (61) facing the middle template (4). The end of the shaping column (62) away from the main block (61) is located at one end of the waste hole (8) near the bottom of the forming groove (7).

7. A rubber molding process for a rubber molding die according to any one of claims 1-6, characterized in that, include: Add rubber material into the middle template (4), close the upper template (3), middle template (4) and lower template (5) and start pressurizing and heating to form; during forming, the clearance part (6) forms a through hole on the product, and the rubber material forms a burr in the waste hole (8); Open the upper template (3), take out the formed product, and the burrs are stuck in the waste hole (8), so that the product can be demolded separately and the burrs can be separated from the product. Open the middle template (4) and separate the middle template (4) from the lower template (5). Clean the rough edges that are stuck to the middle template (4) or the lower template (5) before proceeding to the next product molding.

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