A forming process of stainless steel plate-rubber composite gasket

Abstract

The present application relates to the field of stainless steel plate-rubber composite pad plate, in particular to a forming process of stainless steel plate-rubber composite pad plate, which has the following steps: I, the lower mold after opening is pushed from the forming station to the ejection station, so that the two side molds are respectively connected with the two push-pull mechanisms; II, the push-pull mechanism pulls out the side mold from the lower mold, and the signature strip is separated from the composite pad plate; III, the ejection mechanism under the ejection station ejects the composite pad plate from the lower mold, and then the ejection mechanism is reset; IV, the stainless steel plate is placed in the plate groove; V, the push-pull mechanism inserts the side mold into the lower mold; VI, the lower mold is pulled back from the ejection station to the forming station, and the mold is closed; VII, the rubber material is injected; VIII, pressure curing; IX, opening; the process of I to IX is repeated. The above forming process is used to process a plurality of strip-shaped cavities at the composite interface between the stainless steel plate and the rubber, increase the cushioning effect of the pad plate, and simultaneously constrain the signature strip in the radial and axial directions to eliminate the cantilever effect of the signature strip.

Description

Technical Field

[0001] This invention relates to the field of stainless steel plate-rubber composite pads, specifically to a molding process for stainless steel plate-rubber composite pads. Background Technology

[0002] As a core functional component of the railway fastening system, the railway composite rubber pad (models CRP5, WJ7, WJ8, etc.) plays multiple roles in buffering vibration loads, adjusting track stiffness, and ensuring geometric stability. Its typical structure is composed of a rubber matrix and pre-embedded metal inserts, which are vulcanized at high temperature. It must possess sufficient physical properties and pass stringent tests such as fatigue testing and dynamic-to-static stiffness ratio testing.

[0003] To increase the cushioning capacity of the molded pad, several strip-shaped cavities need to be machined at the composite interface between the stainless steel plate and the rubber. Correspondingly, a removable label structure needs to be added to the mold. At the same time, it is necessary to solve the problem of slight displacement of the label structure due to heat during the glue injection process, and avoid uneven processing of the composite interface. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a molding process for a stainless steel plate-rubber composite pad, which processes several strip-shaped cavities at the composite interface between the stainless steel plate and the rubber to increase the cushioning effect of the pad, while simultaneously constraining the label strip radially and axially to eliminate the cantilever effect of the label strip, reduce its offset during heating and cooling, and make the processing effect of the composite interface more uniform.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] A molding process for a stainless steel sheet-rubber composite pad involves placing a stainless steel sheet in a mold and then injection molding it to obtain the composite pad. The key technology lies in the fact that the mold includes a lower mold, an upper mold, and two side molds symmetrically arranged on both sides of the lower mold. The side molds are equipped with multiple claw mechanisms, each claw mechanism comprising a claw base and multiple sets of labels arranged on the claw base. The lower mold has plate grooves corresponding to the claw mechanisms. The specific process steps are as follows:

[0007] Ⅰ. Push the lower mold from the forming station to the ejection station after the mold is opened, so that the two side molds are respectively connected to the two push-pull mechanisms;

[0008] II. The push-pull mechanism pulls the side mold out of the lower mold, causing the label to be pulled out of the composite pad.

[0009] Ⅲ, the ejection mechanism below the mold ejection station ejects the composite pad from the lower mold, thereby removing the composite pad, and then the ejection mechanism resets;

[0010] IV. Place the stainless steel plate with the adhesive coating on its upper surface into the plate groove;

[0011] V. The push-pull mechanism inserts the side mold into the lower mold, causing the label to move above the stainless steel plate;

[0012] VI. Pull the lower mold back from the ejection station to the forming station and close the upper and lower molds. The side of the upper mold is provided with a base limiting block corresponding to the pull claw base, which is used to limit the horizontal displacement of the pull claw base after the mold is closed. The middle of the upper mold is provided with a pressure strip corresponding to the end of the label, which is used to limit the axial and radial displacement of the label after the mold is closed.

[0013] VII. Inject the adhesive material;

[0014] VIII. Pressure vulcanization;

[0015] IX. Mold making.

[0016] In one embodiment of the present invention, a base connecting platform is provided on the side of the side mold facing the lower mold, and the pull claw base is fixed on the base connecting platform; a base inclined surface is provided on the side of the pull claw base away from the lower mold, and a corresponding inclined surface structure is provided on the base limiting block. When the mold is closed, the inclined surface structure of the base limiting block abuts against the base inclined surface, so that the pull claw base tends to move towards the lower mold.

[0017] In one embodiment of the present invention, the lower mold is provided with two sets of pressure strip limiting protrusions in the middle of the pressure strip, and two pressure strip grooves are provided on the pressure strip corresponding to the two sets of pressure strip limiting protrusions. When the mold is closed, the pressure strip limiting protrusions are embedded in the pressure strip grooves.

[0018] The pressure strip limiting protrusion has a strip passage groove corresponding to the strip. After step V is completed, the end of the strip passes through the strip passage groove and enters between the two pressure strip limiting protrusions.

[0019] The middle part of the pressure strip has a pressure groove corresponding to the end of the label. The cross-section of the pressure groove corresponds to the cross-section of the label. After the mold is closed, the pressure groove presses the end of the label onto the lower mold to limit the radial displacement of the end of the label.

[0020] In one embodiment of the present invention, two label grooves are symmetrically arranged on both sides of one end of the label strip, and a label slope is provided on the side of the label groove facing the pressure strip limiting protrusion. After step V is completed, the label slope is located near the pressure strip limiting protrusion.

[0021] The outer side of the groove of the pressure strip forms a side slope. After the mold is closed, the side slope abuts against the slope of the label to generate an axial tensile force on the label, thereby reducing the axial deformation of the label.

[0022] In one embodiment of the present invention, the lower mold is disposed on the base support, the base support is slidably disposed on two opposing guide rails, and a lower mold driving mechanism is disposed at one end of the two guide rails. The lower mold driving mechanism is connected to the base support to drive the base support to slide, thereby enabling the lower mold to switch between the demolding station and the forming station.

[0023] As one embodiment of the present invention, the push-pull mechanism includes a push-pull drive cylinder disposed on one side of the guide rail, a telescopic rod disposed on the push-pull drive cylinder, a bearing plate disposed at the end of the telescopic rod, and a push-pull plate disposed on the bearing plate. The upper end face of the push-pull plate is flush with the lower end face of the side mold, and the extension and retraction direction of the telescopic rod is perpendicular to the guiding direction of the guide rail.

[0024] The lower end face of the side mold is provided with a long side mold groove, and the upper end face of the push-pull plate is provided with a protruding ridge corresponding to the side mold groove; during the process of the lower mold being pushed from the forming station to the demolding station, the side mold slides into place along the protruding ridge through the side mold groove, and the push-pull plate moves by driving the side mold to move through the protruding ridge.

[0025] In one embodiment of the present invention, a push-out groove is provided on the lower mold within the plate groove, and a lifting hole through the lower mold is provided at the bottom of the push-out groove; a push-out plate is movably disposed within the push-out groove, and a lifting column is movably disposed within the lifting hole, the lifting column being connected to the push-out plate.

[0026] The base has a through hole corresponding to the lifting hole.

[0027] As one embodiment of the present invention, the ejection mechanism includes multiple sets of lifting drive cylinders disposed between the two guide rails, a transition plate disposed on the telescopic rods of the multiple sets of lifting drive cylinders, and multiple top columns disposed on the transition plate, wherein the top columns correspond to the through holes of the bottom support;

[0028] The lifting drive cylinder drives the adapter plate to rise, so that the top column passes through the bottom support through hole and lifts the lifting column, and then the push plate pushes the product out.

[0029] As one embodiment of the present invention, the specific steps of step VII are as follows:

[0030] S1. Preheat the mold to 80-100℃, set the injection pressure to 120Mpa and the material volume delivery rate to 40cm³ / s, and inject the material at 10% of the stroke of the injection screw, so that the material slowly and slowly fills the flow channel until a small amount contacts the inside of the cavity.

[0031] S2, set the injection pressure to 155Mpa and the glue volume delivery rate to 60cm³ / s, and inject glue at 50% of the stroke of the injection screw to fill most of the glue into the cavity;

[0032] S3, set the injection pressure to 160Mpa and the glue volume delivery rate to 70cm³ / s, and inject glue to 30% of the injection screw stroke to basically fill the cavity;

[0033] S4, set the injection pressure to 130Mpa and the glue volume delivery rate to 40cm³ / s, inject glue at 10% of the injection screw stroke, and slowly fill the cavity until the glue is completely filled.

[0034] In one embodiment of the present invention, in step VIII, the injection pressure is set to 100 MPa, the rubber volume conveying rate is 30 cm³ / s, and the pressure is maintained for 1 minute to allow the rubber in the cavity to undergo initial vulcanization and prevent backflow.

[0035] The beneficial effects of adopting the above technical solution are as follows:

[0036] The molding process of this invention involves placing a stainless steel plate in the groove of the lower mold beforehand, and using a removable strip on top of the stainless steel plate. After molding, a composite pad product with several strip-shaped cavities between the stainless steel plate and the rubber can be obtained, thereby increasing the cushioning capacity of the composite pad.

[0037] The label of the present invention is connected to the side mold through the claw base. The side mold can be pulled away from the lower mold by the push-pull mechanism on the side of the mold release station, and then the label is pulled out from the product during the mold release, realizing the automated operation of label extraction and improving the efficiency of product production.

[0038] In this invention, one end of the label is connected to the pull claw base. After the mold is closed, the pull claw base abuts against the base limiting block of the upper mold, while the side mold and the side wall of the lower mold are always abutting against each other, thereby limiting the displacement of the label in the side mold moving direction. The upper mold is finally provided with a pressure strip structure corresponding to the other end of the label. After the mold is closed, the pressure strip structure can press the other end of the label tightly, and at the same time make the label subject to axial traction force to eliminate the cantilever effect on the long label, reduce the offset of the label during the glue injection process, and increase the pass rate of the product after molding. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the mold and base of the embodiment.

[0040] Figure 2 This is a frontal view structural diagram of the mold, guide rail, lower mold drive mechanism, push-pull mechanism, and ejection mechanism after the mold is opened in the embodiment.

[0041] Figure 3 This is a rear view structural diagram of the mold, guide rail, lower mold drive mechanism, push-pull mechanism, and ejection mechanism after the mold is opened in the embodiment.

[0042] Figure 4 This is a structural schematic diagram of the base, guide rail, and ejection mechanism from below in the embodiment.

[0043] Figure 5 This is a schematic diagram of the top view after the base, lower mold, and upper mold of the embodiment are separated.

[0044] Figure 6 This is a schematic diagram of the bottom support, lower mold, and upper mold after they have been separated in the embodiment.

[0045] Figure 7 This is a schematic diagram from above after the upper mold, lower mold, and two side molds of the embodiment are separated.

[0046] Figure 8 This is a schematic diagram of the upper mold, lower mold, and two side molds after they have been separated, viewed from below in the embodiment.

[0047] Figure 9 This is a structural schematic diagram of the pressure strip from the bottom view of the embodiment.

[0048] Figure 10 This is a schematic diagram of the label and pressure strip limiting protrusion after the side mold is inserted into place in the embodiment.

[0049] Figure 11 It is the example after the mold is closed. Figure 10 A schematic diagram of the structure of the label and sealing strip at the location.

[0050] Figure 12 This is a schematic diagram of the lower mold part structure in an embodiment.

[0051] Figure 13 This is a schematic diagram of the structure of the base connecting platform, pull claw base and lower mold contact point after the side mold is inserted into place in the embodiment.

[0052] Figure 14 This is a schematic diagram of the push-pull mechanism and side mold in the embodiment.

[0053] Figure 15 yes Figure 14 A schematic diagram of the structure at point A in the middle.

[0054] Among them: 100 base support; 101 pin; 102 base support through hole;

[0055] 200 Lower mold; 201 Pin through hole; 202 Plate groove; 203 Push groove; 204 Lifting hole; 205 Pressure strip limiting protrusion; 206 Base receiving groove; 207 Guide block;

[0056] 300 Upper mold; 301 Fastening hole; 302 Base limiting block; 303 Pressure strip mounting groove;

[0057] 400 Side mold; 401 Base connecting platform; 402 Side mold slide; 403 Side mold pin;

[0058] 500 guide rail;

[0059] 600 Lower die drive mechanism;

[0060] 700 Push-pull mechanism; 701 Push-pull drive cylinder; 702 Telescopic rod; 703 Support plate; 704 Push-pull plate; 705 Protruding rib;

[0061] 800 Ejection mechanism; 801 Lifting drive cylinder; 802 Adapter plate; 803 Ejector column;

[0062] 1. Pull claw base; 1-1 Base groove; 1-2 Base inclined surface;

[0063] 2. Label; 2-1 Label groove; 2-2 Label bevel;

[0064] 3. Pressing strip; 3-1 Pressing strip side; 3-2 Pressing strip center; 3-3 Pressing groove; 3-4 Relief groove; 3-5 Side bevel;

[0065] 4. Lifting column; 5. Push plate; 6. Stainless steel plate. Detailed Implementation

[0066] To make the objectives, technical solutions, and advantages of the present invention clearer, the invention will be described clearly and completely below in conjunction with specific embodiments.

[0067] A molding process for a stainless steel plate-rubber composite pad involves placing the stainless steel plate 6 in a... Figure 1 The composite pad is obtained by compression injection molding in the mold described above. The placement method of the stainless steel plate 6 can be found in [reference needed]. Figure 7 and Figure 8 .

[0068] The specific structure of the mold in this embodiment is as follows:

[0069] See Figure 5 and Figure 6The system includes a lower mold 200, an upper mold 300, and two side molds 400 symmetrically arranged on both sides of the lower mold 200. Each side mold 400 is elongated, with side mold pins 403 at both ends facing the lower mold 200. A guide sleeve is provided on the lower mold 200 corresponding to the side mold pins 403, and the side mold pins 403 slide along the guide sleeves to guide the movement of the side molds 400 relative to the lower mold 200. Two sets of claw mechanisms are provided on each side mold 400. Each claw mechanism includes a claw base 1 and six sets of labels 2 arranged on the claw base 1. A plate groove 202 is provided on the lower mold 200 corresponding to the claw mechanism. In this embodiment, there are four sets of plate grooves 202. See details... Figure 7 In this embodiment, the processing of four products can be completed simultaneously. The stainless steel plate 6 can be placed in the plate groove 202, with the edge of the stainless steel plate 6 abutting against the side wall of the plate groove 202, forming... Figure 12 The chimerism state in the middle.

[0070] Introduction to edge mold 400:

[0071] See Figure 7 and Figure 8 The side mold 400 facing the lower mold 200 has a base connecting platform 401, and the pull claw base 1 is fixed on the base connecting platform 401. See also Figure 12 The lower mold 200 is provided with a base receiving groove 206 corresponding to the base connecting platform 401. After the side mold 400 is inserted into the lower mold 200, the base connecting platform 401 is embedded in the base receiving groove 206. See also Figure 13 The lower end face of the pull claw base 1 is provided with a plurality of base sliding grooves 1-1 at intervals. The lower mold 200 is provided with guide blocks 207 corresponding to the base sliding grooves 1-1. The pull claw base 1 slides along the guide blocks 207 through the base sliding grooves 1-1, which is used to guide the pull claw base 1 when the side mold 400 moves, thereby increasing the accuracy of the side mold 400 during the insertion process.

[0072] See Figure 13 The pull claw base 1 has a base inclined surface 1-2 on the side away from the lower mold 200, and the base limiting block 302 has a corresponding inclined surface structure on the base inclined surface 1-2. When the mold is closed (combined with...) Figure 6 and Figure 8 (Content of the above), the inclined structure of the base limiting block 302 abuts against the inclined surface 1-2 of the base, so that the claw base 1 tends to move toward the lower mold 200, thereby preventing the claw mechanism from moving away from the lower mold 200.

[0073] Introduction to the installation and assembly of pressure strip 3 with the upper and lower molds:

[0074] See Figure 6 and Figure 8A pressure strip 3 is provided at the middle of the upper mold 300 corresponding to the end of the label 2, and the pressure strip 3 is fixed in the pressure strip mounting groove 303 in the middle of the upper mold 300. See Figure 10 The lower mold 200 has two sets of pressure strip limiting protrusions 205 in the middle corresponding to the pressure strip 3. The pressure strip 3 has two pressure strip grooves corresponding to the two sets of pressure strip limiting protrusions 205. (See the mold closing procedure.) Figure 11 The pressure strip limiting protrusion 205 is embedded in the pressure strip groove. The inner side of the pressure strip limiting protrusion 205 abuts against the inner side of the pressure strip groove. A gap is provided between the side slope 3-5 on the outer side of the pressure strip groove and the outer side of the pressure strip limiting protrusion 205 to apply axial force to the label 2.

[0075] See Figure 10 The pressure strip limiting protrusion 205 has a strip passage groove corresponding to the strip 2. After the push-pull mechanism 700 inserts the side mold 400 into the lower mold 200, the end of the strip 2 passes through the strip passage groove and enters between the two pressure strip limiting protrusions 205.

[0076] Regarding the function of the pressure strip 3 in the embodiment on the label 2:

[0077] See Figure 9 The middle part 3-2 of the pressure strip 3 is provided with a pressure groove 3-3 corresponding to the end of the label 2. The cross section of the pressure groove 3-3 corresponds to the cross section of the label 2. After the mold is closed, the pressure groove 3-3 presses the end of the label 2 onto the lower mold 200 to limit the radial displacement of the end of the label 2.

[0078] See Figure 10 and Figure 11 Two symmetrical label grooves 2-1 are provided on both sides of one end of the label strip 2. A label slope 2-2 is provided on the side of each label groove 2-1 facing the pressure strip limiting protrusion 205. After the push-pull mechanism 700 inserts the side mold 400 into the lower mold 200, the label slope 2-2 is located near the pressure strip limiting protrusion 205. A side slope 3-5 is formed on the outer side of the pressure strip groove. (See attached image) Figure 9 The side slope 3-5 is the slope structure inside the pressure strip side 3-1. The pressure strip side 3-1 is provided with a relief hole 3-4 at the position corresponding to the label groove 2-1. After the mold is closed, the side slope 3-5 on both sides of the relief hole 3-4 abuts against the label slope 2-2 to generate axial tension on the label 2, thereby reducing the axial deformation of the label 2.

[0079] This achieves radial and axial displacement of the free end of the label 2, while applying a force to the label 2 pointing towards the central axis of the lower mold 200 to overcome the cantilever effect, reduce the offset of the label 2 in the molding process, and increase the yield of the finished product.

[0080] Description of the mating relationship between the base 100 and the mold in the embodiment:

[0081] The lower mold 200 is mounted on the base 100, see details. Figure 5 and Figure 6 The base support 100 has four corner pins 101. The lower mold 200 has pin through holes 201 corresponding to the pins 101. The upper mold 300 has fastening holes 301 corresponding to the pin through holes 201. The pins 101 pass through the pin through holes 201 to connect the base support 100 and the lower mold 200. The fastening holes 301 fasten to the pins 101 to guide the closing of the upper mold 300 and the lower mold 200.

[0082] Introduction to the lower die drive mechanism 600 and the push-pull mechanism 700:

[0083] See details Figure 2 and Figure 3 The base 100 is slidably mounted on two opposing guide rails 500. One end of each guide rail 500 is provided with a lower mold drive mechanism 600. The lower mold drive mechanism 600 includes a lower mold drive cylinder and a telescopic rod mounted on the lower mold drive cylinder. The telescopic rod of the lower mold drive cylinder is connected to the base 100 to drive the base 100 to slide, thereby allowing the lower mold 200 to switch between the demolding station and the forming station.

[0084] See Figure 14 and Figure 15 The push-pull mechanism 700 includes a push-pull drive cylinder 701 disposed on one side of the guide rail 500, a telescopic rod 702 disposed on the push-pull drive cylinder 701, a bearing plate 703 disposed at the end of the telescopic rod 702, and a push-pull plate 704 disposed on the bearing plate 703. The push-pull drive cylinder 701 adopts a hydraulic cylinder structure. The upper end face of the push-pull plate 704 is flush with the lower end face of the side mold 400, and the extension and retraction direction of the telescopic rod 702 is perpendicular to the guiding direction of the guide rail 500. A long strip of side mold groove 402 is formed on the lower end face of the side mold 400, and a protruding ridge 705 is provided on the upper end face of the push-pull plate 704 corresponding to the side mold groove 402. During the process of pushing the lower mold 200 from the forming station to the demolding station, the side mold 400 slides into place along the protrusion 705 through the side mold slide groove 402. When the push-pull plate 704 moves, it drives the side mold 400 to move through the protrusion 705.

[0085] Description of the ejection mechanism 800, base 100, and lower mold 200 related structures used for product ejection:

[0086] See Figure 4 , Figure 6 and Figure 8The lower mold 200 has a push groove 203 located within the plate groove 202, and a lifting hole 204 penetrating the lower mold 200 is provided at the bottom of the push groove 203. A push plate 5 is movably mounted within the push groove 203, and a lifting column 4 is movably mounted within the lifting hole 204, with the lifting column 4 connected to the push plate 5. A bottom support through hole 102 is provided on the bottom support 100 corresponding to the lifting hole 204.

[0087] The ejection mechanism 800 includes multiple sets of lifting drive cylinders 801 disposed between the two guide rails 500, a transition plate 802 disposed on the telescopic rods of the multiple sets of lifting drive cylinders 801, and multiple top columns 803 disposed on the transition plate 802. The top columns 803 correspond to the bottom support through hole 102. The lifting drive cylinders 801 drive the transition plate 802 to rise, so that the top columns 803 pass through the bottom support through hole 102 and lift the lifting column 4, thereby using the push plate 5 to eject the product.

[0088] In this embodiment, the edge of the push plate 5 is beveled, making it a cone with the tip pointing downwards. The corresponding push groove 203 is cone-shaped. After the push plate 5 pushes the product out, when the push plate 5 and the lifting column 4 descend under their own weight, the friction between the edge of the push groove 203 and the side wall of the push plate 5 is reduced, so that the push plate 5 and the lifting column 4 descend quickly.

[0089] The molding process steps are as follows:

[0090] Ⅰ. Push the lower mold 200 after mold opening from the forming station to the mold exit station, so that the two side molds 400 are respectively connected to the two push-pull mechanisms 700;

[0091] II. The push-pull mechanism 700 pulls the side mold 400 out of the lower mold 200, so that the label 2 is pulled out from the composite pad.

[0092] Ⅲ, the ejection mechanism 800 below the mold ejection station ejects the composite pad from the lower mold, thereby removing the composite pad, and then the ejection mechanism 800 resets.

[0093] IV. Place the stainless steel plate 6 with the adhesive coating on its upper surface into the plate groove 202; the process of applying adhesive to the stainless steel plate 6 is as follows: 1. Clean the surface oil stains; 2. Apply Kai Ke Lu Ke adhesive, in two stages: primer and top coat, and let them dry separately to complete the application of the adhesive.

[0094] V. The push-pull mechanism 700 inserts the side mold 400 into the lower mold 200, causing the label 2 to move above the stainless steel plate 6;

[0095] VI. Pull the lower mold 200 back from the ejection station to the forming station to close the upper mold 300 and the lower mold 200.

[0096] VII. Inject rubber compound, which is mainly composed of natural or synthetic rubber;

[0097] VIII. Pressure vulcanization;

[0098] IX. Mold making.

[0099] Repeat steps I through IX until all products are produced.

[0100] It should be noted that, in the above steps, when the initial stainless steel plate 6 is placed, since no product is formed, the content of step III can be omitted.

[0101] The specific steps of step VII are as follows:

[0102] S1. Preheat the mold to 80-100℃, set the injection pressure to 120Mpa and the material volume delivery rate to 40cm³ / s, and inject the material at 10% of the stroke of the injection screw, so that the material slowly and slowly fills the flow channel until a small amount contacts the inside of the cavity.

[0103] S2, set the injection pressure to 155Mpa and the glue volume delivery rate to 60cm³ / s, and inject glue at 50% of the stroke of the injection screw. At this time, the pressure inside the cavity is small, and most of the glue can be quickly filled into the cavity.

[0104] S3, set the injection pressure to 160Mpa and the glue volume conveying rate to 70cm³ / s, and perform 30% of the injection screw stroke for injection. At this time, most of the glue has been injected into the cavity, and the pressure inside the cavity increases. The injection pressure needs to be increased to fill the cavity to a minimum.

[0105] S4, set the injection pressure to 130 MPa and the material delivery rate to 40 cm³ / s, and inject the material at 10% of the injection screw stroke. At this stage, the cavity is basically filled and the internal pressure reaches its peak. It is necessary to reduce the pressure and flow rate and fill slowly to avoid excessive pressure in the cavity, which could cause the material temperature to rise too high and result in scorching.

[0106] Finally, in step VIII, the injection pressure is set to 100 MPa and the rubber volume conveying rate is 30 cm³ / s. The pressure is maintained for 1 minute to allow the rubber in the cavity to undergo initial vulcanization, preventing backflow and reducing the product density.

Claims

1. A molding process of a stainless steel plate-rubber composite gasket, in which a stainless steel plate is placed in a mold to be injection molded by die pressing to produce a composite gasket, characterized in that, The mold comprises a lower mold, an upper mold and two side molds symmetrically arranged on both sides of the lower mold, a plurality of puller mechanisms are arranged on the side molds, the puller mechanism comprises a puller base and a plurality of groups of tags arranged on the puller base, a plate groove corresponding to the puller mechanism is arranged on the lower mold, and the process steps are as follows: Ⅰ. After the mold is opened, the lower mold is pushed from the molding station to the ejection station, and the two side molds are respectively connected with the two push-pull mechanisms; Ⅱ. The push-pull mechanism pulls out the side mold from the lower mold, and the tag is separated from the composite base plate; Ⅲ. The ejection mechanism below the ejection station ejects the composite base plate from the lower mold to take out the composite base plate, and then the ejection mechanism is reset; Ⅳ. Put the stainless steel plate coated with a bonding agent on the upper surface into the plate groove; Ⅴ. The push-pull mechanism inserts the side mold into the lower mold, so that the tag moves above the stainless steel plate; Ⅵ. The lower mold is pulled back from the ejection station to the molding station, and the mold of the upper mold and the lower mold is closed, the side of the upper mold corresponding to the puller base is provided with a base limiting block for limiting the horizontal displacement of the puller base after the mold is closed; the middle part of the upper mold is provided with a pressing strip corresponding to the end of the tag; The middle part of the lower mold is provided with two groups of pressing strip limiting ribs corresponding to the pressing strip, two pressing strip grooves are formed in the pressing strip corresponding to the two groups of pressing strip limiting ribs, the pressing strip limiting ribs are embedded in the pressing strip grooves during the mold closing, a tag passing groove is formed in the pressing strip limiting rib corresponding to the tag, and the end of the tag passes through the tag passing groove between the two pressing strip limiting ribs after the step V is completed; the middle part of the pressing strip is provided with a pressing groove corresponding to the end of the tag, the cross section of the pressing groove corresponds to the cross section of the tag, and the end of the tag is pressed on the lower mold after the mold is closed, so as to limit the radial displacement of the end of the tag; two tag grooves are symmetrically arranged on one end of the tag, and a tag inclined surface is arranged on one side of the tag groove facing the pressing strip limiting rib, and the tag inclined surface is located near the pressing strip limiting rib after the step V is completed; the outer side of the pressing strip groove forms a side edge inclined surface, and the side edge inclined surface is in abutment with the tag inclined surface after the mold is closed, so as to generate axial tension on the tag, thereby reducing the deformation of the tag in the axial direction; Ⅶ. Inject the glue; Ⅷ. Pressure curing; Ⅸ. Open the mold.

2. The forming process of a stainless steel plate-rubber composite backing plate according to claim 1, characterized in that, The side of the side mold facing the lower mold is provided with a base connecting table, and the puller base is fixedly arranged on the base connecting table; the side of the puller base away from the lower mold is provided with a base inclined surface, and the base limiting block is provided with opposite inclined surface structures corresponding to the base inclined surface, and the inclined surface structures of the base limiting block abut against the base inclined surface during the mold closing, so that the puller base has a movement trend towards the lower mold.

3. The forming process of a stainless steel plate-rubber composite backing plate according to claim 1, characterized in that, The lower mold is arranged on a bottom support, the bottom support is slidingly arranged on two opposite guide rails, one end of the two guide rails is provided with a lower mold driving mechanism, the lower mold driving mechanism is connected with the bottom support to drive the bottom support to slide, thereby switching the lower mold between the ejection station and the molding station.

4. The forming process of a stainless steel plate-rubber composite backing plate according to claim 3, characterized in that, The push-pull mechanism comprises a push-pull driving cylinder arranged on one side of the guide rail, a telescopic rod arranged on the push-pull driving cylinder, a bearing plate arranged at the end of the telescopic rod, and a push-pull plate arranged on the bearing plate, wherein the upper end surface of the push-pull plate is flush with the lower end surface of the side mold, and the telescopic direction of the telescopic rod is perpendicular to the guide direction of the guide rail. A long side mold sliding groove is arranged on the lower end surface of the side mold, and a convex rib is arranged on the upper end surface of the push-pull plate corresponding to the side mold sliding groove; during the process of pushing the lower mold from the molding station to the mold removal station, the side mold is slid along the convex rib to the position through the side mold sliding groove, and the side mold is moved by the convex rib when the push-pull plate moves.

5. The forming process of a stainless steel plate-rubber composite backing plate according to claim 3, characterized in that, A push-out groove is arranged in the plate groove on the lower mold, and a lifting hole penetrating the lower mold is arranged at the bottom of the push-out groove; a push-out plate is arranged in the push-out groove in a lifting manner, and a lifting column is arranged in the lifting hole in a lifting manner, and the lifting column is connected with the push-out plate; A bottom support through hole is arranged on the bottom support corresponding to the lifting hole.

6. The forming process of a stainless steel plate-rubber composite backing plate according to claim 5, characterized in that, The ejection mechanism comprises a plurality of lifting driving cylinders arranged between the two guide rails, an adapter plate arranged on the telescopic rods of the plurality of lifting driving cylinders, and a plurality of jacks arranged on the adapter plate, wherein the jacks correspond to the bottom support through hole; The lifting driving cylinder drives the adapter plate to rise, so that the jacks pass through the bottom support through hole and lift the lifting column, and then the product is ejected by the push-out plate.

7. The process for forming a stainless steel plate-rubber composite mat according to claim 1, wherein The specific steps of step VII are as follows: S1, preheat the mold to 80-100℃, set the injection pressure to 120MPa, the volume delivery rate of the rubber material to 40cm³ / s, and perform injection of 10% of the stroke of the injection screw to make the rubber material fill the runner slowly at low speed until a small amount of the rubber material contacts the inside of the cavity; S2, set the injection pressure to 155MPa, the volume delivery rate of the rubber material to 60cm³ / s, and perform injection of 50% of the stroke of the injection screw to make most of the rubber material fill the cavity; S3, set the injection pressure to 160MPa, the volume delivery rate of the rubber material to 70cm³ / s, and perform injection of 30% of the stroke of the injection screw to make the cavity basically full of rubber; S4, set the injection pressure to 130MPa, the volume delivery rate of the rubber material to 40cm³ / s, and perform injection of 10% of the stroke of the injection screw to slowly fill the cavity with rubber until the cavity is completely filled with rubber.

8. The forming process of a stainless steel plate-rubber composite backing plate according to claim 1, characterized in that, In step VIII, the injection pressure is set to 100MPa, the volume delivery rate of the rubber material is set to 30cm³ / s, and the pressure is maintained for 1 minute to preliminarily vulcanize the rubber in the cavity to prevent backflow.

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