Powder metallurgy friction body assembly re-pressing tool

Abstract

The utility model provides a powder metallurgy friction body assembly re-pressing tool, relates to the field of special equipment for powder metallurgy friction body machining, and solves the problems of low working efficiency and poor safety when an existing powder metallurgy friction body assembly tool is used for re-pressing. A limiting block is arranged on the edge of the front end of the upper surface of a base plate of the positioning mechanism in the length direction, guide rails are symmetrically arranged on the two sides of the upper surface of the base plate in the length direction, and a dustproof block is embedded in the middle of the base plate through multiple grooves. The sliding mechanism comprises a re-pressing fixing plate arranged above the base plate and slidably arranged between the two symmetrical guide rails, the re-pressing fixing plate is provided with a re-pressing positioning hole and a height limiting block, and a pull rod is arranged at the rear end of the re-pressing fixing plate. The friction body assembly does not need to be manually stretched into an equipment working area to be taken and placed, the operation safety is improved, the cleaning frequency is reduced, the working efficiency during friction body assembly tool re-pressing can be improved, and manual operation is easy.

Description

TECHNICAL FIELD

[0001] The utility model relates to special equipment of powder metallurgy friction body processing, especially a powder metallurgy friction body assembly re-pressing tool. BACKGROUND

[0002] As the core component of the brake system of the motor train unit of the guide rail train, the powder metallurgy brake block directly influences the braking performance of the train, and with the wide application of high-speed rail, the quality and demand of the powder metallurgy brake block are further required to be improved. The powder metallurgy brake block is mainly composed of a steel back, a powder metallurgy friction body assembly and connecting pieces, wherein the powder metallurgy friction body assembly is composed of a friction body pressing blank and a back plate, and the powder metallurgy friction body assembly and the steel back constitute an integral whole through the connecting pieces. The powder metallurgy friction body assembly is the core component of the powder metallurgy brake block, has a certain friction coefficient and can meet the use requirements of the braking distance of the motor train unit.

[0003] In the batch production of the powder metallurgy friction body assembly, the number of layers of the friction body pressing blank placed for sintering and loading into the furnace is relatively large (about 16-18 layers), the flatness requirement for the placement for loading into the furnace is 0.1-0.15 mm, and the factors such as one-way pressure, the height difference of the friction body pressing blank itself, the weight difference, the equipment precision and the like affect, so that the height difference and the flatness of the whole assembly after sintering exist differences. The statistical data shows that after ten continuous sintering, the height difference of the friction body assembly is less than 0.25 mm, and the flatness is between 0.03-0.12 mm. Among them, about 73.6% of the products can be directly used, the height difference of which is less than 0.1 mm, and the flatness is less than 0.05 mm. In order to ensure the consistency of the product size, the remaining process products are re-pressed so that the height and the flatness reach the range that can be directly used.

[0004] At present, the re-pressing process adopts a 25t flat plate vulcanizing machine, which is limited to the operation space of the equipment, the existing re-pressing tool structure and the operation mode, such as Figure 8 and Figure 9As shown, the re-pressing fixed plate 21 is provided with four re-pressing fixed blocks 26, the periphery is provided with height limiting blocks 23, and the friction body assembly 27 is arranged on the re-pressing fixed block 26. There are significant defects: one is low production efficiency, limited by the structure of the tooling, only 1-4 products can be pressed at a time, and the re-pressing time of a single batch is about 3 minutes; the other is poor safety, after re-pressing is completed, a person needs to put his hand into the working area of the equipment to take and place the product, and there is a risk of mechanical injury. The patent document with publication number CN116174716A provides a powder metallurgy friction block assembly self-pressing sintering tooling, which adopts a base body and a pressing cover, the cavity of the base body is provided with threads matched with the threads of the pressing cover, and a torque wrench is used to adjust the thread pretightening force of the pressing cover during use. Its structure is complex, the base plate of the base body is provided with a small number of friction blocks, and manual operation is required to put into the working area, which is not easy to take and place, and the safety is low. The patent document with publication number CN218656810U provides a tooling for sintering of dynamic vehicle brake blocks, which includes a graphite disc and a graphite seat. The number of friction blocks is small, and manual operation is still required to put into the working area, which is not easy to take and place, and the safety is low. Therefore, there is an urgent need for a re-pressing tooling with high efficiency, safety and low cost to improve production efficiency and ensure product size consistency. Practical new type content

[0005] The utility model discloses a powder metallurgy friction body assembly re-pressing tooling, solve the powder metallurgy friction body assembly tooling of existing when for re-pressing, the problem of low working efficiency, poor safety, and it loads many friction body assemblies, is easy to operate, and the safety is high.

[0006] The technical scheme adopted by the utility model is: the powder metallurgy friction body assembly re-pressing tooling includes a friction body bearing mechanism, re-pressing positioning holes and height limiting blocks, and the technical points are: the friction body bearing mechanism is provided with a positioning mechanism and a sliding mechanism, the positioning mechanism includes a base plate, a limiting block is arranged on the front edge of the upper surface of the base plate in the length direction, two symmetrical guide rails are arranged on the both sides of the upper surface of the base plate in the length direction, dustproof blocks are embedded in the middle part of the base plate through a plurality of grooves, a plurality of grooves are arranged on the working surface of the dustproof blocks, and the rear part of the upper surface of the base plate is a sliding mechanism socket end; the sliding mechanism includes a re-pressing fixed plate arranged above the base plate and slidingly arranged between the two symmetrical guide rails, the re-pressing fixed plate is provided with a plurality of re-pressing positioning holes, the re-pressing fixed plate is provided with the height limiting blocks around, and a pull rod is arranged at the rear end of the re-pressing fixed plate.

[0007] The grooves arranged on the working surface of the dustproof blocks are four intersecting grooves in the shape of a well.

[0008] A limiting screw is arranged on the upper surface of the base plate close to the rear part, a limiting sliding groove matched with the limiting screw is arranged on the back of the re-pressing fixed plate in the sliding direction, an opening is arranged at the rear end of the limiting sliding groove, and the length of the limiting sliding groove is less than the length of the re-pressing fixed plate.

[0009] The gusset plate is provided with a limiting screw through hole near the sliding mechanism insertion end, and the limiting screw is threadedly connected with the limiting screw through hole, and the screw rod of the limiting screw is exposed on the upper surface of the gusset plate.

[0010] The nine complex pressure positioning holes are arranged in a square array.

[0011] The advantages and beneficial effects of the powder metallurgy friction body assembly complex pressure tool are as follows: the friction body bearing mechanism of the powder metallurgy friction body assembly complex pressure tool adopts a positioning mechanism and a sliding mechanism to set a complex pressure fixing plate, the number of complex pressure positioning holes can be increased, thus a matching number of friction bodies can be loaded, the number of friction bodies subjected to single complex pressure can be greatly increased, and the production efficiency is improved; the positioning mechanism is provided with a guide rail and a limiting block, the complex pressure fixing plate can be slidably set, the complex pressure fixing plate can be pushed and pulled by a pull rod, an operator can conveniently pull out the complex pressure fixing plate from a work area to take and place a friction body assembly product, the friction body assembly product does not need to be manually placed in the equipment work area, the risk of mechanical injury of the press is eliminated, and the operation safety is improved; the dustproof block with a plurality of grooves is provided, the grooves can collect friction bodies and dust particles, the cleaning frequency is reduced, and the maintenance and manufacturing costs are effectively reduced; therefore, the working efficiency and safety of the friction body assembly tool during complex pressure can be improved, and the operator can easily operate. BRIEF DESCRIPTION OF DRAWINGS

[0012] The utility model will be further described in connection with the drawings.

[0013] Figure 1 is the overall structure schematic view of the utility model embodiment;

[0014] Figure 2 is the positioning mechanism structure schematic view of the utility model embodiment;

[0015] Figure 3 is the A-A direction sectional view of Figure 2 ;

[0016] Figure 4 is the assembly limiting screw sectional view of Figure 2 ;

[0017] Figure 5 is the sliding mechanism structure schematic view of the utility model embodiment;

[0018] Figure 6 is the sliding mechanism front view of the utility model embodiment;

[0019] Figure 7 is the B-B direction sectional view of Figure 6 ;

[0020] Figure 8 is the existing friction body assembly complex pressure tool structure schematic view;

[0021] Figure 9 yes Figure 8 CC section view.

[0022] Explanation of the serial numbers in the figure: 10 positioning mechanism, 11 pad, 12 guide rail, 13 dust block, 14 limiting threaded through hole, 15 limiting screw, 16 groove, 17 groove, 18 limiting block, 19 pin hole, 191 positioning pin, 20 sliding mechanism, 21 re-pressure fixing plate, 22 re-pressure positioning hole, 23 height limiting block, 24 pull rod, 25 limiting slide groove, 26 re-pressure fixing block, 27 friction body assembly. DETAILED DESCRIPTION

[0023] according to Figures 1-7 The utility model is described in detail, and examples are given. Figure 1 As shown, a powder metallurgy friction body assembly re-pressing tooling, the friction body bearing mechanism used in the tooling is provided with a positioning mechanism 10 and a sliding mechanism 20, wherein the positioning mechanism 10 is provided at the lower part of the friction body bearing mechanism, and the positioning mechanism is used to provide a stable sliding guide and positioning reference for the sliding mechanism, such as Figures 2 to 4 As shown, the positioning mechanism mainly consists of a pad 11, a guide rail 12, a limit block 18, and a dust block 13. The main body of the positioning mechanism is the pad 11, made of 45# steel with a hardness of 23-28 HRC. A limit block 18 is provided at the front edge of the pad's upper surface in the longitudinal direction. Guide rails 12 are symmetrically arranged on both sides of the pad's upper surface in the longitudinal direction. The slide grooves of the two symmetrical guide rails are arranged opposite each other. The guide rails are made of P20 steel with a hardness of 28-32 HRC. A plurality of rectangular grooves 16 are provided in the middle of the pad 11. In this embodiment, there are four of them, arranged in a square. Dust blocks 13 are embedded in the grooves 16. The dust blocks are flat and made of 40Cr steel with a hardness of 50-55 HRC. The surface is chrome-plated. A plurality of grooves 17 are provided on the working surface of the dust block. The grooves can be shallow, allowing friction component materials and dust particles to enter the grooves for automatic collection. Because friction material batching processes are performed at the production site, fine particles of friction material are easily affected by mechanical forces and wind energy, becoming airborne. To prevent fine friction material particles in the air from accumulating on the surface of the dust block during tooling operation, potentially hindering tool movement, a groove 17 is provided on the working surface of each dust block, forming a physical barrier. During tooling operation, contaminants (such as fine particles) that accumulate on the sliding surface can enter the groove 17, effectively preventing the sliding mechanism from becoming sluggish due to dust accumulation. During operation, the dust block is pre-placed within the rectangular groove 16 of the backing plate, with the grooved working surface facing upward. A larger number of grooves and dust blocks can be provided; screw holes are pre-set on the dust block 13 and backing plate 11, allowing the dust block 13 to be secured to the backing plate 11 via screws. The upper end of the screw is lower than the upper surface of the dust block to prevent interference with the re-pressing fixing plate 21.

[0024] The rear portion of the upper surface of the backing plate 11 in the longitudinal direction is the sliding mechanism socket end, which can be inserted into the sliding mechanism 20. The limit block 18, the guide rail 12 and the backing plate 11 can be pre-set with screw holes, and the guide rail 12 and the backing plate 11 can be pre-set with pin holes 19. The guide rail 12 can be positioned with the backing plate 11 by a positioning pin 191, and the guide rail 12 and the limit block can be fixed to the backing plate 11 by screws.

[0025] like Figures 5 to 7 As shown, the main body of the sliding mechanism 20 is a re-pressure fixing plate 21 made of Cr12MoV steel and having a hardness of 58-62 HRC. The re-pressure fixing plate 21 is arranged above the pad and slides between two symmetrical guide rails. The re-pressure fixing plate 21 is provided with a plurality of re-pressure positioning holes 22. In this embodiment, nine re-pressure positioning holes are arranged in a square array. Strip-shaped height limiting blocks 23 are provided around the upper surface of the re-pressure fixing plate 21. The height limiting blocks are made of Cr12MoV steel and have a hardness of 58-62 HRC. The height limiting blocks 23 can be fixed to the re-pressure fixing plate 21 by screws. The height limiting blocks 23 and the re-pressure fixing plate 21 can be fixed to the re-pressure fixing plate by screws using pre-set screw holes. A "U"-shaped pull rod 24 is provided at the rear end of the re-pressure fixing plate. The pull rod can be made of φ10mm round steel and bent into a "U" shape. The pull rod and the re-pressure fixing plate are fixedly connected by welding to facilitate the push-pull movement of the tooling during the re-pressure process.

[0026] like Figure 2 As shown, as a further improvement, the multiple grooves 17 set on the working surface of the dustproof block can adopt four cross-shaped grooves, and the horizontal and vertical cross-grooves can be used to better collect friction bodies and dust particles during the re-pressing work.

[0027] like Figures 4 to 6 As shown, as a further improvement, two limit screws 15 are arranged in parallel on the upper surface of the pad 11 of the positioning mechanism 10 near the rear, and two limit slots 25 matching the limit screws 15 are arranged in parallel along the sliding direction on the back of the re-pressure fixing plate 21. The rear end of the limit slot 25 is open and connected to the rear edge of the re-pressure fixing plate 21. The length of the limit slot 25 is less than the length of the re-pressure fixing plate 21, so that the limit screw 15 can abut the front end of the limit slot 25. The width of the limit slot 25 is 9mm. The limit slot limits the maximum distance that the re-pressure fixing plate 21 moves backward to prevent the front end of the re-pressure fixing plate from pulling out the pad and derailing and falling.

[0028] As a further improvement, a limiting threaded through hole 14 is set on the base plate 11 near the socket end of the sliding mechanism, and the limiting screw 15 is threadedly connected to the limiting threaded through hole. The screw of the limiting screw 15 is exposed on the upper surface of the base plate, which can facilitate installation and height adjustment.

[0029] Working principle and working process

[0030] The present invention achieves efficient re-pressing through the coordinated work of the positioning mechanism 10 and the sliding mechanism 20: the positioning mechanism provides guidance and limitation for the sliding mechanism: the guide rail 12 ensures the smooth sliding of the sliding mechanism; the limiting block 18 limits the pushing limit position of the sliding mechanism to ensure that the product is at the pressure center of the equipment during re-pressing; the criss-cross groove 17 of the dust block 13 collects particles of friction body component material in the air to avoid sliding jams; the limiting screw 15 cooperates with the limiting slide 25 of the re-pressing fixed plate to prevent the sliding mechanism from derailing. The sliding mechanism realizes safe placement and precise positioning of the product: the nine re-pressing positioning holes of the re-pressing fixed plate 21 ensure that the product is evenly distributed and fixed in position; the height limiting block controls the maximum compression amount during the re-pressing process to ensure the consistency of product height; the "U"-shaped pull rod facilitates the pushing and pulling of the sliding mechanism, so that the product can be taken and placed without having to reach into the working area of ​​the equipment, thereby improving safety.

[0031] During the re-pressing process, the sliding mechanism 20 is first pulled out using the pull rod 24. The nine friction body components to be re-pressed are then sequentially placed into the re-pressing positioning holes 22 of the re-pressing fixing plate 21 of the sliding mechanism. The sliding mechanism is pushed in using the pull rod. The equipment is started for re-pressing. After the re-pressing is completed, the sliding mechanism is pulled out using the pull rod to remove the nine re-pressed products. It has been verified that using the new tooling of the utility model to re-press 500 friction body components, each pressing time is approximately 2.5 minutes, and the total process time is approximately 139 minutes. The height difference is between 0.01 and 0.05 mm, and the flatness is ≤0.03 mm. The product dimensions are highly consistent, meeting the product usage requirements. At the same time, the re-pressing efficiency is greatly improved, and the safety hazards of operation and the manufacturing costs are reduced.

[0032] In summary, the purpose of this utility model is achieved.

Claims

1. A powder metallurgy friction material assembly co-pressing tooling comprising a friction material carrier mechanism, a co-pressing locating hole and a height limiting block, characterized in that: The friction body bearing mechanism is provided with a positioning mechanism and a sliding mechanism. The positioning mechanism includes a pad, a limit block is provided at the front end edge of the upper surface of the pad in the length direction, guide rails are symmetrically provided on both sides of the upper surface of the pad in the length direction, a dust block is embedded in the middle of the pad through multiple grooves, a plurality of grooves are provided on the working surface of the dust block, and the rear part of the upper surface of the pad in the length direction is the socket end of the sliding mechanism; the sliding mechanism includes a re-pressure fixing plate provided above the pad and slidingly provided between the two symmetrical guide rails, the re-pressure fixing plate is provided with multiple re-pressure positioning holes, the height limit blocks are provided around the re-pressure fixing plate, and a pull rod is provided at the rear end of the re-pressure fixing plate.

2. The powder metallurgy friction material assembly can compact tooling of claim 1 wherein: The grooves arranged on the working surface of the dustproof block are four grooves that intersect in a well shape.

3. The powder metallurgy friction material assembly can compact tooling of claim 1 wherein: A limiting screw is provided on the upper surface of the pad near the rear, and a limiting slide matching the limiting screw is provided on the back of the re-pressure fixing plate along the sliding direction. An opening is provided at the rear end of the limiting slide, and the length of the limiting slide is less than the length of the re-pressure fixing plate.

4. The powder metallurgy friction material assembly can compact tooling of claim 3, wherein: The backing plate is provided with a limiting threaded through hole near the socket end of the sliding mechanism, the limiting screw is threadedly connected to the limiting threaded through hole, and the screw rod of the limiting screw is exposed on the upper surface of the backing plate.

5. The powder metallurgy friction material assembly can compact tooling of claim 1 wherein: There are nine re-pressing positioning holes arranged in a square array.

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