Hot pressing device for black line clutch facing production

Abstract

According to the hot pressing device for black line clutch facing production in the field of press machine equipment, through the arrangement of the communicating hole communicating the extrusion cavity with the outer annular cavity, residual air left between a bearing ring and an annular protrusion during die assembly of an upper die and a lower die can be conveniently extracted; the influence of residual gas on hot press molding of the clutch facing during mold closing is reduced; in addition, by arranging an upper ejection cylinder, cold air flow is injected into the upper ejection cylinder when the upper mold is demolded, so that a piston core is pushed by air pressure to extend out of an annular bulge to provide downward extrusion force for a clutch facing, cold air flow is injected into a gap between the annular bulge and the clutch facing, and separation of the clutch facing and the annular bulge is accelerated by the air flow; the stripping damage is reduced while the demolding speed of the upper mold is increased, and the clutch facing is protected.

Description

Technical Field

[0001] The present invention relates to clutch facing production equipment, in particular to a hot pressing device for producing black line clutch facing applied in the field of press equipment. Background Art

[0002] Clutch facings are primarily categorized by material: traditional asbestos-based facings, semi-metallic facings, composite fiber facings, ceramic fiber facings, and asbestos-free organic facings. Asbestos-based facings are gradually being phased out of the market due to environmental concerns. Semi-metallic facings contain metal fibers, offering high thermal stability and wear resistance. Composite fiber facings utilize a blend of various fibers, such as aramid and glass fiber, to balance friction performance and comfort. Ceramic fiber facings offer high-temperature resistance and a stable friction coefficient, making them suitable for high-performance vehicles. Asbestos-free organic facings utilize environmentally friendly materials, such as phenolic resin and aramid staple fibers, and have become the mainstream choice in modern clutch manufacturing.

[0003] In daily actual production, fiber sheets with a black color are usually called black line clutch sheets. Its professional production process mainly includes the following steps: First, the selected yarns are coated with rubber to enhance their friction performance and structural stability; then, after refining and vulcanization processes, the rubber on the surface of the yarn is fully solidified to form a basic material with certain strength and toughness; then, professional equipment is used to wind the refined and vulcanized base material into a sheet embryo, and preliminary curing is carried out to ensure the stability of its shape and size; finally, the wound and preliminary cured sheet embryo is placed in a hot press and hot-pressed under precisely controlled temperature and pressure conditions to obtain a black line clutch sheet with excellent friction performance and durability.

[0004] In actual application, existing clutch facing hot presses generally face two major technical difficulties. On the one hand, during the mold closing stage, due to the imperfect gas removal mechanism during the mold closing process, it is often easy to cause residual gas in the mold cavity, which not only affects the quality of the dough forming, but also may cause internal defects such as bubbles or gaps, thereby weakening the overall performance of the clutch facing; on the other hand, during the demolding process, due to improper control of the adhesion between the mold and the dough, and insufficient mold surface treatment technology or lubrication measures, the dough is prone to adhesion to the mold, which not only increases the difficulty of production operations, but may also cause damage to the surface of the dough, affecting the appearance quality and dimensional accuracy of the product.

[0005] The existing patent with publication number CN108312608A is a fully automatic clutch facing hot press, which includes a hot press body, a hot pressing mold, an automatic demoulding device, a preheating pushing device, an automatic feeding device, a release agent spraying device and a synchronous cold pressing device; the automatic feeding device includes a front sealing plate vertically fixed on the side of the feeding base plate, side sealing plates fixed at both ends of the front sealing plate and a rear sealing plate fixed on the side sealing plates, guide rods and rodless cylinders are installed between the side sealing plates, and a guide block is fixed on the piston of the rodless cylinder, and the guide block is connected to the guide rod; a horizontal connecting plate is fixedly connected to the guide block, and the horizontal connecting plate is located above the feeding base plate and has a certain gap with the feeding base plate; an avoidance groove is opened in the horizontal connecting plate, and a pulling plate is connected to the groove wall on one side of the avoidance groove, and a pair of pins are fixed to the front end of the pulling plate; a pushing plate is connected to the other groove wall. The fully automatic clutch face sheet hot press of the above invention greatly improves production efficiency and saves costs. Although the patent improves the efficiency of feeding and discharging materials, it does not solve the problem of residual gas during the mold closing process and the adhesion problem during demolding. Summary of the Invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the gas residue problem during mold closing and the adhesion problem during mold release affect the molding quality of the clutch facing.

[0007] In order to solve the above problems, the present invention provides a hot pressing device for producing black line clutch facing sheets, comprising a frame, a lower die is fixedly connected to the frame, an upper die cooperating with the lower die is nested above the lower die, and a main oil cylinder is fixedly connected to the upper end of the upper die to drive it to move up and down; the lower die is provided with a die cavity in an annular shape with an open upper end, a carrying ring fixedly connected to the inner wall of the die cavity is provided in the die cavity, the carrying ring divides the die cavity into an extrusion cavity and a sliding cavity distributed up and down, when the clutch facing sheet is hot pressed, the facing sheet is placed in the extrusion cavity above the carrying ring, the upper die is provided with an annular protrusion nested in the extrusion cavity and slidingly abutting against the inner wall of the extrusion cavity, a first heating wire is fixedly connected in the carrying ring, and a second heating wire is fixedly connected in the annular protrusion;

[0008] The lower die is provided with an outer annular cavity and an inner annular cavity, and the inner annular cavity and the outer annular cavity are respectively located on the inner and outer sides of the extrusion cavity, the inner annular cavity and the outer annular cavity are concentrically arranged and connected through a U-shaped channel; the outer end of the outer die is fixedly connected to a tee pipe connected to the outer annular cavity, and the outer end double tubes of the tee pipe are respectively connected to a suction pipe and a filling pipe, the suction pipe is connected to an external negative pressure suction machine, the filling pipe is connected to an external hot and cold air supply mechanism, and the lower end of the inner annular cavity is connected to a discharge pipe extending to the bottom of the lower die; a connecting hole connected to the extrusion cavity is provided on the upper part of the inner wall of the outer annular cavity, and when the annular protrusion extends into the extrusion cavity and is located at the upper end of the connecting hole, the extrusion cavity is closed by the annular protrusion and connected to the outer annular cavity through the connecting hole;

[0009] The lower end surface of the annular protrusion is embedded with a plurality of upper top cylinders distributed in a circle, and the upper top cylinder includes a mounting cylinder fixedly connected to the annular protrusion, a piston core is slidably connected in the mounting cylinder, and the piston core is penetrated by a limit plate slidably connected thereto, and the upper end of the limit plate is provided with a spring which is sleeved on the outside of the piston core and abuts against the upper end of the piston core; the piston core is provided with a center hole extending to the upper end surface, and the lower part of the center hole is connected with a plurality of blowing holes which are distributed in a circle and extend to the outer end surface of the circumference of the piston core; the upper end of the mounting cylinder is connected to an annular tube fixed in the upper mold through an air injection pipe, and the upper end of the annular tube is connected to a connecting pipe which extends to the top of the upper mold and is connected to the inner end single pipe of the tee pipe, and the ends of the suction pipe, the filling pipe, the discharge pipe and the connecting pipe are all provided with solenoid valves.

[0010] In the hot pressing device for producing the black line clutch facing, residual gas is discharged and efficient blow-off is achieved by providing a connecting hole connecting the extrusion cavity and the outer annular cavity and an upper ejector provided in the upper mold.

[0011] As a further improvement of the present application, an ejection mechanism is provided in the sliding cavity, and the ejection mechanism includes a plurality of lower ejector rods distributed in a circular pattern, the lower ejector rods pass through the load-bearing ring and the upper ends thereof extend to the upper end surface of the load-bearing ring, the lower ends of the plurality of lower ejector rods are fixedly connected to the same sliding disk that is slidably nested in the sliding cavity, the lower end of the sliding disk is fixedly connected to the output end of the ejection cylinder, and the fixed end of the ejection cylinder is fixedly connected to the lower end of the frame 1.

[0012] As a further improvement of the present application, an upper diffusion chamber and a lower collection chamber are independently distributed in the upper and lower parts of the lower push rod, an upper spray hole communicating with the upper diffusion chamber is opened on the upper side wall of the lower push rod, and an air suction hole communicating with the lower collection chamber is opened on the lower side wall;

[0013] The sliding disk includes an outer annular cylinder and an inner annular cylinder nested therein. The upper diffusion chamber is connected to the inner annular cylinder through a central tube arranged in the lower collecting chamber. The inner annular cylinder is connected to an air intake pipe, which is connected to an external hot and cold air supply mechanism. The lower end of the lower collecting chamber is connected to the inner cavity of the outer annular cylinder. The lower part of the outer annular cylinder is connected to an exhaust pipe, which is connected to an external negative pressure suction machine. Solenoid valves are provided at the ends of both the air intake pipe and the exhaust pipe.

[0014] As a further improvement of the present application, a guide column with a pointed lower end is provided at the center of the lower end surface of the upper mold, and the lower mold is provided with a columnar cavity that cooperates with the guide column.

[0015] As a further improvement of the present application, the vertical height of the connecting hole from the bearing ring is greater than the thickness of the clutch facing plate, and the thickness of the annular protrusion is greater than the vertical height from the lowest end of the connecting hole to the upper end surface of the lower mold.

[0016] As a further improvement of the present application, the sliding disk is an annular disk, and an ejection hole adapted to the lower ejector rod is opened on the carrying ring.

[0017] As a further improvement of the present application, the lower ejector rod is a vertical round rod, and the ejection hole is a vertical round hole.

[0018] As a further improvement of the present application, both the outer annular cylinder and the inner annular cylinder are hollow annular cylinders, and the inner annular cylinder is fixedly connected to the inner wall of the outer annular cylinder through a plurality of circumferentially distributed support columns, and an annular gap for air flow is formed between the inner annular cylinder and the outer annular cylinder.

[0019] In summary, the present invention is provided with a connecting hole connecting the extrusion chamber and the outer annular chamber, which facilitates the extraction of residual air remaining between the carrying ring and the annular protrusion when the upper film and the lower mold are closed, reducing the influence of the residual gas on the hot pressing forming of the clutch facing during closing, and improving the forming quality of the clutch facing; at the same time, by arranging the inner and outer annular chambers inside and outside the extrusion chamber, before hot pressing and during cooling, by injecting hot air flow or cold air flow, the inner circumferential side wall and the outer circumferential side wall of the extrusion chamber are synchronously preheated or cooled, so that the heat is more evenly distributed on the inner and outer circumferential walls of the extrusion chamber during hot pressing, reducing the temperature difference among various parts of the extrusion chamber, and improving the hot pressing forming effect; in addition, by arranging the upper ejector tube, when the upper mold is demolded, the cold air flow is injected into the upper ejector tube, so that the piston core is pushed out of the annular protrusion by the air pressure to provide downward extrusion force on the clutch facing, and the cold air flow is injected into the gap between the annular protrusion and the clutch facing, and the air flow is used to accelerate the separation of the clutch facing and the annular protrusion, thereby improving the demolding speed of the upper mold and reducing the separation damage, thereby protecting the clutch facing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the three-dimensional structure of this application;

[0021] Figure 2 This is a schematic diagram of the longitudinal cross-sectional structure of the present application;

[0022] Figure 3 for Figure 2 Schematic diagram of the enlarged structure at A in the middle;

[0023] Figure 4 This is a schematic diagram of the cross-sectional structure of the lower mold in this application;

[0024] Figure 5 This is a schematic diagram of the transverse cross-sectional structure of the present application;

[0025] Figure 6 for Figure 5 Schematic diagram of the enlarged structure at B in the middle;

[0026] Figure 7 This is a schematic diagram of the connection between the upper top cylinder and the connecting pipe in this application;

[0027] Figure 8This is a schematic cross-sectional structural diagram of the upper top tube in this application;

[0028] Figure 9 This is a schematic diagram of the movement of the piston core in this application;

[0029] Figure 10 Schematic diagram of the exploded structure of the ejection mechanism in this application;

[0030] Figure 11 This is a schematic diagram of the residual gas extraction state in this application;

[0031] Figure 12 This is a schematic diagram of the state of the upper ejector when the upper mold is separated in this application;

[0032] Figure 13 Schematic diagram of the cross-sectional structure of the lower ejector rod and the sliding plate in this application;

[0033] Figure 14 for Figure 13 Schematic diagram of the enlarged structure at C in the middle;

[0034] Figure 15 This is a schematic diagram of the state in which the lower ejector rod cools the lower end surface of the clutch facing plate in this application;

[0035] Figure 16 Schematic diagram of the airflow in the lower push rod.

[0036] Description of the numbers in the figure:

[0037] 1. Frame; 2. Lower die; 201. Die cavity; 2011. Extrusion cavity; 2012. Sliding cavity; 202. Outer annular cavity; 203. Inner annular cavity; 204. U-shaped channel; 205. Connecting hole; 3. Upper die; 301. Annular protrusion; 302. Guide column; 4. Main oil cylinder; 5. Loading ring; 501. Ejector hole; 6. First heating wire; 7. Second heating wire; 8. Tee pipe; 9. Suction pipe; 10. Filling pipe; 11. Discharge pipe; 12. Lower ejector; 1201 , upper diffusion chamber; 1202, upper spray hole; 1203, lower collecting chamber; 1204, suction hole; 1205, center tube; 13, sliding disk; 1301, outer annular cylinder; 1302, inner annular cylinder; 14, ejection cylinder; 15, upper ejector cylinder; 16, annular tube; 17, connecting tube; 18, mounting tube; 19, piston core; 1901, center hole; 1902, spray hole; 20, limit plate; 21, spring; 22, air injection pipe; 23, air inlet pipe; 24, exhaust pipe. DETAILED DESCRIPTION

[0038] The following describes two implementation methods of the present application in detail with reference to the accompanying drawings.

[0039] The first implementation method:

[0040] Figure 1-12 The present invention shows a hot pressing device for producing black line clutch facing sheets, comprising a frame 1, to which a lower die 2 is fixedly connected, an upper die 3 cooperating with the lower die 2 is nested above the lower die 2, and a main oil cylinder 4 that drives the upper die 3 to move up and down is fixedly connected; the lower die 2 is provided with a die cavity 201 in the shape of an annular ring with an open upper end, a carrying ring 5 fixedly connected to its inner wall is provided in the die cavity 201, and the carrying ring 5 divides the die cavity 201 into an extrusion cavity 2011 and a sliding cavity 2012 distributed vertically. When hot pressing the clutch facing sheet, the facing sheet is placed in the extrusion cavity 2011 above the carrying ring 5, and the upper die 3 is provided with an annular protrusion 301 nested in the extrusion cavity 2011 and slidingly abutting against the inner wall of the extrusion cavity 2011, a first heating wire 6 is fixedly connected in the carrying ring 5, and a second heating wire 7 is fixedly connected in the annular protrusion 301;

[0041] The lower die 2 is provided with an outer annular cavity 202 and an inner annular cavity 203, and the inner annular cavity 203 and the outer annular cavity 202 are respectively located on the inner and outer sides of the extrusion cavity 2011, the inner annular cavity 203 and the outer annular cavity 202 are concentrically arranged and connected through a U-shaped channel 204; the outer end of the outer die 2 is fixedly connected to a tee pipe 8 connected to the outer annular cavity 202, and the outer end double tubes of the tee pipe 8 are respectively connected to a suction pipe 9 and a filling pipe 10, and the suction pipe 9 is connected to an external negative pressure suction machine The filling pipe 10 is connected to the external hot and cold air supply mechanism. The lower end of the inner annular cavity 203 is connected to the discharge pipe 11 extending to the bottom of the lower mold 2. The upper part of the inner wall of the outer annular cavity 202 is provided with a connecting hole 205 connected to the extrusion cavity 2011. When the annular protrusion 301 extends into the extrusion cavity 2011 and is located at the upper end of the connecting hole 205, the extrusion cavity 2011 is closed by the annular protrusion 301 and is connected to the outer annular cavity 202 through the connecting hole 205.

[0042] The lower end surface of the annular protrusion 301 is embedded with a plurality of upper top cylinders 15 distributed in a circle, and the upper top cylinder 15 includes a mounting cylinder 18 fixedly connected to the annular protrusion 301, and a piston core 19 is slidably connected to the mounting cylinder 18. The piston core 19 is penetrated by a limit plate 20 slidably connected thereto, and the upper end of the limit plate 20 is provided with a spring 21 which is sleeved on the outside of the piston core 19 and abuts against the upper end of the piston core 19; the piston core 19 is provided with a central hole 1901 extending to the upper end surface, and the lower part of the central hole 1901 is connected with a plurality of blowing holes 1902 distributed in a circle and extending to the outer end surface of the circumference of the piston core 19; the upper end of the mounting cylinder 18 is connected to an annular tube 16 fixed in the upper mold 3 through an air injection pipe 22, and the upper end of the annular tube 16 is connected to a connecting pipe 17 extending to the top of the upper mold 3 and connected to the inner end of the tee pipe 8. The ends of the suction pipe 9, the filling pipe 10, the discharge pipe 11 and the connecting pipe 17 are all provided with solenoid valves.

[0043] Specifically, the clutch facing hot pressing process includes the following steps:

[0044] Step 1: Mold Closing, please refer to Figure 11 First, place the clutch facing plate in the extrusion cavity 2011 so that the lower end of the clutch facing plate is in contact with the carrier ring 5. Then start the main oil cylinder 4, which drives the upper die 3 to move downward until the annular protrusion 301 extends into the extrusion cavity 2011 and is located above the connecting hole 205. Then close the main oil cylinder 4.

[0045] Step 2: Pumping out air, please refer to Figure 11 , start the external negative pressure vacuum pump, and open the solenoid valves at the ends of the suction pipe 9 and the connecting pipe 17. The residual air in the extrusion chamber 2011 between the clutch facing plate and the annular protrusion 301 is extracted through the connecting hole 205 and the outer annular chamber 202. After the air extraction is completed, close the external negative pressure vacuum pump and the solenoid valves at the ends of the suction pipe 9 and the connecting pipe 17.

[0046] Specifically, the outer annular cavity 202 and the connecting hole 205 connecting the outer annular cavity 202 and the extrusion cavity 2011 are used to extract the air remaining when the upper mold 3 and the lower mold 2 are closed, thereby preventing the residual air from entering the clutch facing during hot pressing, thereby reducing the impact of the residual air on the hot pressing forming of the clutch facing.

[0047] It should be noted that at this time, the gas in the upper cylinder 15 is also sucked by the negative pressure, so that the pressure inside and outside the upper cylinder 15 is equal, so that the upper cylinder 15 will not extend out from under the annular protrusion 301 due to the negative pressure of the extrusion chamber 2011;

[0048] Step 3: Preheating. Start the main oil cylinder 4 again so that the lower end surface of the annular protrusion 301 is in contact with the upper end surface of the clutch facing. At this time, the circumferential side wall of the annular protrusion 301 closes the connecting hole 205. Then start the external hot and cold air supply mechanism, and open the solenoid valves at the ends of the filling pipe 10 and the discharge pipe 11. The hot air flow is injected into the outer annular cavity 202 through the filling pipe 10 and the three-way pipe 8, and then injected into the inner annular cavity 203 through the U-shaped channel 204. Finally, it is discharged to the outside of the mold through the discharge pipe 11, thereby preheating the upper and lower molds. After the preheating is completed, start again and close the external hot and cold air supply mechanism and the solenoid valves at the ends of the filling pipe 10 and the discharge pipe 11.

[0049] Specifically, by providing an inner annular cavity 203 and an outer annular cavity 202 located inside and outside the extrusion cavity 2011, the inner and outer circumferential side walls of the extrusion cavity 2011 are preheated, so that the temperature distribution during hot pressing heating is more uniform, thereby improving the molding quality. In addition, the preheating reduces the gap between the annular protrusion 301 and the inner and outer walls of the extrusion cavity 2011, thereby improving the sealing effect.

[0050] It should be noted that the external hot and cold air supply mechanism includes a high-pressure air compressor and a heating cylinder for heating the airflow, which provides hot airflow and cold airflow for preheating and cooling operations. This is prior art and will not be described in detail in this application.

[0051] Step 4: Extrusion heating: start the first heating wire 6 and the second heating wire 7 and start the master cylinder 4. The annular protrusion 301 and the carrying ring 5 cooperate to perform hot pressing and forming on the clutch facing. After the hot pressing and forming is completed, the master cylinder 4, the first heating wire 6 and the second heating wire 7 are closed.

[0052] Step 5: Cooling: Start the external hot and cold air supply mechanism and open the solenoid valves at the ends of the filling pipe 10 and the discharge pipe 11. Cold air is injected into the outer annular cavity 202 and the inner annular cavity 203 to cool the lower die 2, the upper die 3 and the clutch facing in the extrusion cavity 2011.

[0053] Specifically, by providing an inner annular cavity 203 and an outer annular cavity 202 located inside and outside the extrusion cavity 2011, the inner and outer circumferential side walls of the extrusion cavity 2011 are cooled synchronously, making it easier for the inner and outer circumferential walls of the annular clutch facing to separate from the inner and outer walls of the extrusion cavity 2011.

[0054] Step 6: Upper mold 3 is separated. Please refer to Figure 12 , continue cooling and start the solenoid valve at the end of the master oil cylinder 4 and the connecting pipe 17, and close the solenoid valve at the end of the discharge pipe 11. At this time, as the annular protrusion 301 moves upward, cold air is injected into the mounting cylinder 18 of the upper top cylinder 15, and the cold air is injected into the mounting cylinder 18 through the connecting pipe 17, the annular tube 16 and the air injection pipe 22. The piston core 19 is gradually extended from the annular protrusion 301 by the air pressure, and the clutch facing plate is squeezed downward. At the same time, when the blowing hole 1902 of the piston core 19 moves to the bottom of the annular protrusion 301 and is connected to the extrusion chamber 2011, the cold air is injected into the gap between the annular protrusion 301 and the clutch facing plate through the center hole 1901 and the blowing hole 1902. The part of the clutch facing plate adhering to the annular protrusion 301 is peeled off and squeezed by the air flow, reducing the adhesion between the clutch facing plate and the annular protrusion 301.

[0055] Specifically, the piston core 19 presses downward and injects cold air into the gap between the annular protrusion 301 and the clutch facing plate. The airflow peels off the clutch facing plate that is adhered to the lower end surface of the annular protrusion 301, thereby reducing adhesion between the clutch facing plate and the annular protrusion 301 and reducing peeling damage.

[0056] Step 7: Remove the clutch facing.

[0057] Compared with the traditional clutch facing hot press, the present invention is provided with a connecting hole 205 connecting the extrusion chamber 2011 and the outer annular chamber 202, which is convenient for extracting the residual air remaining between the carrying ring 5 and the annular protrusion 301 when the upper film 3 and the lower mold 2 are closed, reducing the influence of the residual gas on the hot pressing forming of the clutch facing during closing, and improving the forming quality of the clutch facing; at the same time, by arranging the inner annular chamber 203 and the outer annular chamber 202 inside and outside the extrusion chamber 2011, before hot pressing and during cooling, by injecting hot air flow or cold air flow, the inner circumferential side wall and the outer circumferential side wall of the extrusion chamber 2011 are synchronously preheated or simultaneously heated. Step cooling makes the heat more evenly distributed on the inner and outer circumferential walls of the extrusion cavity 2011 during hot pressing, reduces the temperature difference among various parts of the extrusion cavity 2011, and improves the hot pressing forming effect; in addition, by setting the upper ejector 15, when the upper mold 3 is demoulded, a cold air flow is injected into the upper ejector 15, so that the piston core 19 is pushed out by the air pressure to provide a downward extrusion force on the clutch facing plate, and a cold air flow is injected into the gap between the annular protrusion 301 and the clutch facing plate, and the air flow is used to accelerate the peeling of the clutch facing plate and the annular protrusion 301, thereby increasing the demoulding speed of the upper mold 3 and reducing the peeling damage, thereby protecting the clutch facing plate.

[0058] See also Figure 1 A guide column 302 with a pointed lower end is provided at the center of the lower end surface of the upper mold 3, and a columnar cavity is opened in the lower mold 2 to cooperate with the guide column 302.

[0059] Specifically, the cooperation between the guide column 302 and the columnar cavity improves the stability of the upper mold 3 and the lower mold 2 during hot pressing, thereby improving the hot pressing quality.

[0060] See also Figure 3 and Figure 4 The vertical height of the connecting hole 205 from the carrying ring 5 is greater than the thickness of the clutch facing plate, and the thickness of the annular protrusion 301 is greater than the vertical height from the lower end of the connecting hole 205 to the upper end surface of the lower mold 2.

[0061] Specifically, after the annular protrusion 301 penetrates into the extrusion cavity 2011, the annular space between the annular protrusion 301 and the clutch face plate is connected to the connecting hole 205, which is convenient for air extraction, and the annular protrusion 301 closes the connecting hole 205 during preheating, hot pressing and cooling operations.

[0062] See also Figure 3 and Figure 10An ejection mechanism is provided in the sliding cavity 2012, and the ejection mechanism includes a plurality of lower ejector rods 12 distributed in a circumferential manner. The lower ejector rods 12 pass through the load-bearing ring 5 and their upper ends extend to the upper end surface of the load-bearing ring 5. The lower ends of the plurality of lower ejector rods 12 are fixedly connected to the same sliding disk 13 that is slidably nested in the sliding cavity 2012. The lower end of the sliding disk 13 is fixedly connected to the output end of the ejection cylinder 14, and the fixed end of the ejection cylinder 14 is fixedly connected to the lower end of the frame 1.

[0063] Specifically, after the upper mold 3 is driven by the main cylinder 4 to disengage from the clutch facing plate, the ejection cylinder 14 is started, and the ejection cylinder 14 pushes the sliding plate 13 to move upward in the sliding cavity 2012. The sliding plate 13 pushes the lower ejector rod 12 to extend upward from the load-bearing ring 5, and pushes the clutch facing plate to disengage from the load-bearing ring 5, and then lifts the clutch facing plate above the lower mold 2.

[0064] See also Figure 10 The sliding disk 13 is an annular disk, and the carrying ring 5 is provided with an ejection hole 501 adapted to the lower ejector rod 12.

[0065] Specifically, the clutch facing plate attached to the carrying ring 5 is vertically squeezed at multiple points by multiple lower push rods 12, and is vertically peeled at multiple points to reduce damage to the clutch facing plate.

[0066] Second implementation method:

[0067] Figure 13-16 A hot pressing device for producing black-line clutch facings is shown. Based on the first embodiment, a lower push rod 12 is internally provided with an upper diffusion chamber 1201 and a lower collection chamber 1203, which are independently distributed vertically. An upper spray hole 1202 communicating with the upper diffusion chamber 1201 is provided on the upper sidewall of the lower push rod 12, and an air intake hole 1204 communicating with the lower collection chamber 1203 is provided on the lower sidewall.

[0068] The sliding disk 13 includes an outer annular cylinder 1301 and an inner annular cylinder 1302 nested therein. The upper diffusion chamber 1201 is connected to the inner annular cylinder 1302 through a central tube 1205 arranged in the lower collecting chamber 1203. The inner annular cylinder 1302 is connected to an air intake pipe 23, and the air intake pipe 23 is connected to an external hot and cold air supply mechanism; the lower end of the lower collecting chamber 1203 is connected to the inner cavity of the outer annular cylinder 1301, and the lower part of the outer annular cylinder 1301 is connected to an exhaust pipe 24, and the exhaust pipe 24 is connected to an external negative pressure suction machine. Solenoid valves are provided at the ends of both the air intake pipe 23 and the exhaust pipe 24.

[0069] Specifically, in step 5 of the first embodiment, please refer to Figure 15 and Figure 16While cooling the extrusion cavity 2011 through the outer annular cavity 202 and the inner annular cavity 203, the ejection oil cylinder 14 is started to drive the sliding plate 13 to move downward, so that the lower ejector rod 12 moves downward and disengages from the ejection hole 501 of the carrying ring 5. Then, the external hot and cold air supply mechanism, the external negative pressure suction machine, and the electromagnetic valves at the ends of the air inlet pipe 23 and the exhaust pipe 24 are started to inject the cold air flow into the upper diffusion cavity 1201 through the air inlet pipe 23, the inner annular cylinder 1302, and the central pipe 1205. , and then ejected through the upper spray hole 1202, the ejected cold air flow is injected into the sliding cavity 2012 located above the sliding disk 13, the air flow contacts the clutch facing plate through the ejection hole 501, and then removes the heat from the surface of the clutch facing plate, and is injected into the lower collecting cavity 1203 through the suction hole 1204, and then discharged through the outer annular cylinder 1301 and the exhaust pipe 24, thereby cooling the lower end surface of the clutch facing plate, improving the cooling effect of the lower end surface of the clutch facing plate, and facilitating the subsequent ejection operation;

[0070] In step six of the first embodiment, after the upper mold 3 is peeled off from the upper end surface of the clutch facing plate through the upper ejector tube 15, the ejection cylinder 14 is started again, so that the lower ejector rod 12 passes through the ejection hole 501 and the upper spray hole 1202 moves to the top of the ejection hole 501. At this time, the main cylinder 4 is started again, so that the main cylinder 4 and the ejection cylinder 14 move synchronously, at the same speed and in the same direction. The external cold air flow is injected into the gap between the clutch facing plate and the carrier ring 5 through the upper spray hole 1202. The air flow accelerates the cooling of the lower end surface of the clutch facing plate and the peeling between it and the carrier ring 5, reducing peeling damage. At the same time, the lower ejector rod 12 and the piston core 19 elastically clamp and lift the clutch facing plate, so that the clutch facing plate is forced to remain vertical, further improving the stability of the clutch facing plate during peeling, reducing peeling damage, and improving demolding quality.

[0071] See also Figure 13 The lower ejector rod 12 is a vertical round rod, and the ejection hole 501 is a vertical round hole.

[0072] Specifically, when the upper spray hole 1202 is located at the ejection hole 501 , the inner wall of the ejection hole 501 has a good sealing effect on the upper spray hole 1202 .

[0073] See also Figure 14 Both the outer annular cylinder 1301 and the inner annular cylinder 1302 are hollow annular cylinders, and the inner annular cylinder 1302 is fixedly connected to the inner wall of the outer annular cylinder 1301 through a plurality of circumferentially distributed support columns, and an annular gap for air flow is formed between the inner annular cylinder 1302 and the outer annular cylinder 1301.

[0074] Specifically, it is convenient to inject cold air and discharge waste gas during cooling.

[0075] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A hot pressing device for producing black line clutch facing, characterized in that: The machine comprises a frame (1), a lower die (2) is fixedly connected to the frame (1), an upper die (3) cooperating with the lower die (2) is nested above the lower die (2), and a main oil cylinder (4) is fixedly connected to the upper end of the upper die (3) for driving the upper die (3) to move up and down; the lower die (2) is provided with a die cavity (201) in the shape of an annular ring and with an open upper end, a bearing ring (5) fixedly connected to the inner wall of the die cavity (201) is provided in the die cavity (201), and the bearing ring (5) divides the die cavity (201) into extrusion sections distributed up and down. A pressure chamber (2011) and a sliding chamber (2012), when the clutch facing sheet is hot-pressed, the facing sheet is placed in the extrusion chamber (2011) above the bearing ring (5), the upper die (3) is provided with an annular protrusion (301) nested in the extrusion chamber (2011) and in sliding contact with the inner wall of the extrusion chamber (2011), a first heating wire (6) is fixedly connected in the bearing ring (5), and a second heating wire (7) is fixedly connected in the annular protrusion (301); The lower die (2) is provided with an outer annular cavity (202) and an inner annular cavity (203), and the inner annular cavity (203) and the outer annular cavity (202) are respectively located at the inner and outer sides of the extrusion cavity (2011), and the inner annular cavity (203) and the outer annular cavity (202) are concentrically arranged and communicated through a U-shaped channel (204); the outer end of the outer die (2) is fixedly connected with a three-way pipe (8) communicated with the outer annular cavity (202), and the outer end double pipes of the three-way pipe (8) are respectively communicated with a suction pipe (9) and a filling pipe (10), The suction pipe (9) is connected to an external negative pressure suction machine, the filling pipe (10) is connected to an external cold and hot air supply mechanism, and the lower end of the inner annular cavity (203) is connected to a discharge pipe (11) extending to the bottom of the lower mold (2); the upper part of the inner wall of the outer annular cavity (202) is provided with a connecting hole (205) connected to the extrusion cavity (2011), and when the annular protrusion (301) extends into the extrusion cavity (2011) and is located at the upper end of the connecting hole (205), the extrusion cavity (2011) is closed by the annular protrusion (301); The lower end surface of the annular protrusion (301) is embedded with a plurality of upper top cylinders (15) distributed in a circumferential manner, and the upper top cylinder (15) includes a mounting cylinder (18) fixedly connected to the annular protrusion (301), a piston core (19) is slidably connected to the mounting cylinder (18), and the piston core (19) is penetrated by a limit plate (20) slidably connected thereto, and the upper end of the limit plate (20) is provided with a spring (21) sleeved on the outer side of the piston core (19) and abutting against the upper end of the piston core (19); the piston core (19) is provided with a central hole (21) extending to the upper end surface 1901), the lower part of the center hole (1901) is connected with a plurality of blowing holes (1902) which are distributed in a circle and extend to the outer end surface of the circle of the piston core (19); the upper end of the mounting cylinder (18) is connected with an annular tube (16) fixed in the upper mold (3) through an air injection pipe (22), the upper end of the annular tube (16) is connected with a connecting tube (17) which extends to the top of the upper mold (3) and is connected with the inner end of the three-way tube (8); the ends of the suction tube (9), the filling tube (10), the discharge tube (11) and the connecting tube (17) are all provided with solenoid valves.

2. A hot pressing device for producing black line clutch facing according to claim 1, characterized in that: An ejection mechanism is provided in the sliding cavity (2012), and the ejection mechanism comprises a plurality of lower ejector rods (12) distributed in a circumferential manner, the lower ejector rods (12) passing through the load-bearing ring (5) and the upper ends thereof extending to the upper end surface of the load-bearing ring (5), the lower ends of the plurality of lower ejector rods (12) being fixedly connected to a same sliding disk (13) slidably nested in the sliding cavity (2012), the lower end of the sliding disk (13) being fixedly connected to the output end of an ejection oil cylinder (14), and the fixed end of the ejection oil cylinder (14) being fixedly connected to the lower end of the frame (1).

3. A hot pressing device for producing black line clutch facing according to claim 2, characterized in that: An upper diffusion chamber (1201) and a lower collection chamber (1203) independently distributed up and down are provided inside the lower push rod (12); an upper spray hole (1202) communicating with the upper diffusion chamber (1201) is provided on the upper side wall of the lower push rod (12); and an air suction hole (1204) communicating with the lower collection chamber (1203) is provided on the lower side wall; The sliding disk (13) includes an outer annular cylinder (1301) and an inner annular cylinder (1302) nested therein; the upper diffusion chamber (1201) is connected to the inner annular cylinder (1302) via a central tube (1205) arranged in the lower collecting chamber (1203); the inner annular cylinder (1302) is connected to an air inlet pipe (23); the air inlet pipe (23) is connected to an external hot and cold air supply mechanism; the lower end of the lower collecting chamber (1203) is connected to the inner cavity of the outer annular cylinder (1301); the lower part of the outer annular cylinder (1301) is connected to an exhaust pipe (24); the exhaust pipe (24) is connected to an external negative pressure suction machine; solenoid valves are provided at the ends of both the air inlet pipe (23) and the exhaust pipe (24).

4. A hot pressing device for producing black line clutch facing according to claim 1, characterized in that: A guide column (302) with a pointed lower end is provided at the center of the lower end surface of the upper mold (3), and a columnar cavity cooperating with the guide column (302) is provided in the lower mold (2).

5. A hot pressing device for producing black line clutch facing according to claim 1, characterized in that: The vertical height of the connecting hole (205) from the bearing ring (5) is greater than the thickness of the clutch face plate, and the thickness of the annular protrusion (301) is greater than the vertical height from the lowest end of the connecting hole (205) to the upper end surface of the lower mold (2).

6. A hot pressing device for producing black line clutch facing according to claim 2, characterized in that: The sliding disk (13) is an annular disk, and an ejection hole (501) adapted to the lower ejector rod (12) is provided on the bearing ring (5).

7. A hot pressing device for producing black line clutch facing according to claim 3, characterized in that: The lower ejector rod (12) is a vertical round rod, and the ejection hole (501) is a vertical round hole.

8. The hot pressing device for producing black line clutch facing according to claim 3, characterized in that: Both the outer annular cylinder (1301) and the inner annular cylinder (1302) are hollow annular cylinders, and the inner annular cylinder (1302) is fixedly connected to the inner wall of the outer annular cylinder (1301) via a plurality of circumferentially distributed support columns, and an annular gap for airflow is formed between the inner annular cylinder (1302) and the outer annular cylinder (1301).

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