Powder metallurgy friction material brazing positioning tool

Abstract

The utility model belongs to the technical field of brazing positioning, and particularly relates to a powder metallurgy friction material brazing positioning tool which comprises a bottom plate, a plurality of assembly blocks and a plurality of matching blocks, the bottom plate is of a frame structure, the assembly blocks and the matching blocks are detachably arranged in the bottom plate, and the assembly blocks can be adjusted according to the size of the bottom plate. And the matching blocks are arranged in the gaps between the adjacent assembly blocks, so that the stability of the matching block structure is ensured. The assembly block is of a hexagonal structure, and a circular groove is formed in the center of the hexagonal structure and used for tightly fixing the friction block, so that the friction block is positioned. By means of the positioning tool, the friction unit can be accurately assembled to the needed position, the problem that brazing materials are not uniform due to key groove positioning is avoided, the key groove machining cost is saved, and the product manufacturing cost can be saved by about 10%.

Description

Technical Field

[0001] This utility model belongs to the field of brazing positioning technology, specifically relating to a brazing positioning tool for powder metallurgy friction materials. Background Technology

[0002] Powder metallurgy friction materials possess advantages such as stable friction coefficient, good thermal stability, and good compatibility with steel friction pairs, making them a high-performance friction material. However, due to the presence of components like graphite with poor miscibility with metals, and the inherent porosity of the material, the shear and compressive strength of the friction material itself is not high, posing a risk of failure when used alone as a component. Therefore, friction materials are typically fabricated into simple circular or polygonal friction blocks and combined with a steel substrate to ensure the strength of the assembly.

[0003] The assembly process of friction units and steel substrates typically involves high-temperature brazing. When multiple friction units are assembled on a single steel substrate, positioning keyways are generally used for positioning. However, this method can easily lead to solder entering the positioning keyways, causing positioning failure and potentially resulting in insufficient localized strength, thus affecting the product's bonding performance. Furthermore, the positioning method of combining friction units with positioning keyways on the steel substrate increases processing costs. Utility Model Content

[0004] The purpose of this invention is to provide a brazing positioning fixture for powder metallurgy friction materials. By adjusting the assembly method of the brazing fixture, the processing cost of the positioning keyway is saved, and the stability of the brazing quality of the product is improved.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] An embodiment of this utility model provides a brazing positioning fixture for powder metallurgy friction materials, including a base plate, an assembly block, and a mating block. The assembly block and the mating block are detachably disposed inside the base plate, and the mating block is provided between the assembly blocks.

[0007] As a further technical solution, the base plate is a frame structure, and the frame structure is connected in a movable or fixed manner.

[0008] As a further technical solution, the assembly block has a hexagonal structure with a circular groove at the center.

[0009] As a further technical solution, the matching block has a rhomboid structure.

[0010] As a further technical solution, the frame height of the base plate is the same as the thickness of the assembly block and the thickness of the mating block.

[0011] As a further technical solution, the number of the assembly blocks or matching blocks is multiple.

[0012] As a further technical solution, a friction block is also included, which has a cylindrical structure.

[0013] As a further technical solution, the friction block and the assembly block are tightly connected by a circular groove at their center.

[0014] As a further technical solution, a rigid substrate is also included, wherein the rigid substrate is a rectangular plate.

[0015] As a further technical solution, the rigid substrate and the friction block are connected by solder paste.

[0016] The beneficial effects of the above-described embodiments of this utility model are as follows:

[0017] (1) The assembly block or matching block in this utility model can be flexibly adjusted according to the size and quantity of the friction block, thereby adapting to the precise positioning of the brazing of friction materials of various shapes and materials, avoiding the problem of uneven brazing material caused by keyway positioning, and saving keyway processing costs. The cost can save about 10% of the product manufacturing cost.

[0018] (2) The frame material of the base plate in this utility model can be set as a movable connection, which facilitates the quick non-separation of the product and the positioning fixture after positioning. Attached Figure Description

[0019] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0020] Figure 1 This is an exploded view of the brazing positioning fixture and friction block for powder metallurgy friction materials in this utility model;

[0021] Figure 2 This is a schematic diagram of the brazing positioning fixture for powder metallurgy friction materials in this utility model;

[0022] Figure 3 This is a schematic diagram of the brazing positioning fixture for powder metallurgy friction materials and the assembled friction block in this utility model.

[0023] Figure 4 This is a top view of the assembled product in this utility model;

[0024] Figure 5 This is a left view of the assembled product in this utility model;

[0025] The diagram is for illustrative purposes only.

[0026] Among them, the base plate 1, assembly block 2, matching block 3, friction block 4, and rigid base plate 5 are included. Detailed Implementation

[0027] Example 1

[0028] In a typical embodiment of this utility model, such as Figure 1 , 2 As shown, a brazing positioning fixture for powder metallurgy friction materials is provided, including a base plate 1, assembly blocks 2 and matching blocks 3. The base plate 1 is a frame structure. The assembly blocks 2 and matching blocks 3 are detachably arranged inside the base plate 1. There are multiple assembly blocks 2, which can be adjusted according to the size of the base plate 1. Matching blocks 3 are provided in the gaps between adjacent assembly blocks 2, thereby ensuring the stability of the structure of the matching blocks 2.

[0029] Friction block 4 is a cylindrical structure made of existing powder metallurgy friction material, such as the BF761 powder metallurgy friction material for high-speed fan shafts produced by Shandong Baiderui Rail Transit Technology Co., Ltd. For example... Figure 3 As shown, the positioning fixture can be used to position the friction block 4, avoiding the problems of low positioning efficiency, friction powder entering the positioning keyway leading to positioning failure, and insufficient local strength caused by the existing method of positioning the friction block by making a keyway on the base plate and then positioning it. This also avoids the problems of insufficient positioning efficiency, insufficient positioning powder entering the positioning keyway leading to positioning failure, and insufficient local strength affecting the bonding performance of the product.

[0030] The base plate 1 can be made of rectangular steel substrate. The assembly block 2 has a hexagonal structure with a circular groove in the center. This groove is used to tightly fix the friction block 4, thereby achieving the positioning of the friction block 4 and improving the stability of the brazing positioning. The mating block 3 has a rhomboid structure, and there are multiple rhomboid structures. The number and size of the gaps between the assembly blocks 2 can be adjusted. The mating block 3 is used to increase the stability of the assembly block 2 structure. The frame height of the base plate 1 is the same as the thickness of the assembly block 2 and the thickness of the mating block 3, thereby improving the overall structural stability of the positioning fixture.

[0031] The assembly process of the powder metallurgy friction material brazing positioning fixture in this utility model is as follows:

[0032] (1) Assemble the assembly block 2 inside the base plate 1 according to the arrangement design requirements of the product friction block, and fill the gap between adjacent assembly blocks 2 with matching blocks 3 to obtain the assembled positioning fixture.

[0033] (2) Place the friction block 4 in the circular groove of the assembly block 2 in the positioning fixture to obtain the positioned friction block;

[0034] (3) Apply brazing paste to the surface of friction block 4, press steel substrate 5 onto the friction block with brazing paste applied, leave for a certain period of time, and after the steel substrate and friction block are firmly bonded, disassemble the assembly fixture to obtain the product after the steel substrate and friction block are combined.

[0035] (4) Move the product to a brazing furnace for brazing and sintering to further enhance the adhesion between the steel substrate 5 and the friction block 4.

[0036] The brazing paste used in this invention is an existing product, which can be prepared by mixing CuSn10 brazing powder with ethyl α-cyanoacrylate and an appropriate amount of anhydrous ethanol; the brazing sintering of the product adopts an existing sintering procedure, which can be carried out in a powder metallurgy bell furnace, and sintered at 800℃ for 60 minutes.

[0037] The positioning fixture in this application can accurately assemble the friction unit into the required position, avoiding the problem of uneven brazing material caused by keyway positioning, and saving keyway processing costs, which can reduce the product manufacturing cost by about 10%.

[0038] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A brazing positioning fixture for powder metallurgy friction materials, characterized in that, It includes a base plate, assembly blocks, and mating blocks. The assembly blocks and mating blocks are detachably disposed inside the base plate, and mating blocks are provided between the assembly blocks.

2. The brazing positioning fixture for powder metallurgy friction materials according to claim 1, characterized in that, The base plate is a frame structure, and the frame structure is connected in a movable or fixed manner.

3. The brazing positioning fixture for powder metallurgy friction materials according to claim 1, characterized in that, The assembly block has a hexagonal structure with a circular groove at its center.

4. The brazing positioning fixture for powder metallurgy friction materials according to claim 1, characterized in that, The matching block has a rhomboid structure.

5. The brazing positioning fixture for powder metallurgy friction materials according to claim 1, characterized in that, The frame height of the base plate is the same as the thickness of the assembly block and the thickness of the mating block.

6. The brazing positioning fixture for powder metallurgy friction materials according to claim 1, characterized in that, The number of assembly blocks or matching blocks is multiple.

7. The brazing positioning fixture for powder metallurgy friction materials according to claim 1, characterized in that, It also includes a friction block, which has a cylindrical structure.

8. The brazing positioning fixture for powder metallurgy friction materials according to claim 3, characterized in that, The friction block and the assembly block are tightly connected by a circular groove at their center.

9. The brazing positioning fixture for powder metallurgy friction materials according to claim 7, characterized in that, It also includes a rigid substrate, which is a rectangular plate.

10. The brazing positioning fixture for powder metallurgy friction materials according to claim 9, characterized in that, The rigid substrate and the friction block are connected by solder paste.

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