A powder metallurgy brake pad friction block sintering method

Abstract

The application provides a powder metallurgy brake pad friction block sintering method, which comprises the following steps: providing a sintering tool and a pressurized bell jar furnace for matching the sintering tool; placing the friction block in the interior of the sintering tool; supplying heat source to the interior of the sintering tool through a heat supply pipe; after sintering and forming, cooling, taking out the finished product, and obtaining the sintered friction block; wherein the sintering tool comprises an upper die plate with a second heating cavity in the interior and a lower die plate with a third heating cavity in the interior; the sintering tool capable of integrally forming the friction block is arranged, the shape of the product after sintering is uniform, the assembly size is stable, and the product does not need to be machined again, so that the production efficiency is improved, and the stability of the product quality is ensured; the second heating cavity and the third heating cavity wrapped outside the die cavity are arranged, the first heating cavity is matched, the interior and the exterior are heated together, the heating effect is further improved, and the function of saving energy is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high-speed train accessory technology, in particular to a powder metallurgy brake pad friction block sintering method. BACKGROUND

[0002] The brake friction block for high-speed train is a combination structure of multiple powder metallurgy friction blocks;

[0003] In the prior art, the friction block sintering method is to sinter multiple components separately and then assemble them finally. In this way, the uniformity of the shape of the product after sintering is low, the assembly size is unstable, and mechanical processing is needed again, which reduces the production efficiency and cannot guarantee the stability of the product quality.

[0004] Therefore, the powder metallurgy brake pad friction block sintering method is proposed. SUMMARY

[0005] Therefore, the embodiments of the present application hope to provide a powder metallurgy brake pad friction block sintering method to solve or alleviate the technical problems existing in the prior art and at least provide a beneficial choice.

[0006] The technical scheme of the embodiments of the present application is as follows: a powder metallurgy brake pad friction block sintering method, comprising the following steps:

[0007] A sintering tool and a pressurized bell jar furnace matched with the sintering tool are provided;

[0008] The friction block is placed in the interior of the sintering tool;

[0009] Heat source is supplied to the interior of the sintering tool through the heat supply pipe, and after sintering and forming, the product is cooled and taken out to obtain the sintered friction block;

[0010] The sintering tool comprises an upper die plate with a second heating cavity in the interior and a lower die plate with a third heating cavity in the interior, and the lower die plate has a die cavity for limiting the shape of the friction block and a second limiting rod;

[0011] The third heating cavity is wrapped outside the die cavity;

[0012] The pressurized bell jar furnace comprises an upper cover with a heat supply channel in the interior and a lower shell, the upper die plate and the lower die plate are both provided with a communication hole for conveying heat energy, the heat supply channel of the upper cover is communicated with the second heating cavity through the communication hole, and the heat supply channel of the lower shell is communicated with the third heating cavity through the communication hole.

[0013] In some embodiments, the pressurized bell jar furnace further comprises multiple connecting rods for driving the upper cover and / or the lower shell to move.

[0014] In some embodiments: the inside of the lower shell has a first heating cavity, the number of sintering tools is collectively arranged, and the plurality of sintering tools are uniformly distributed in the first heating cavity.

[0015] In some embodiments: the heat supply pipe is in communication with the internal passage of the upper cover and the lower shell.

[0016] In some embodiments: the heat supply pipe is in communication with the first heating cavity.

[0017] In some embodiments: the upper mold plate is fixed on the upper cover.

[0018] In some embodiments: the lower mold plate is fixed on the lower shell.

[0019] In some embodiments: the bottom of the upper mold plate is integrally formed with a plurality of irregular first limiting rods.

[0020] The embodiments of the present application have the following advantages due to the adoption of the above technical solutions:

[0021] Firstly, the sintering tool capable of integrally forming a friction block is arranged, the shape of the product after sintering is uniform, the assembly size is stable, mechanical processing is not needed again, the production efficiency is improved, and the stability of the product quality is ensured.

[0022] Secondly, the second heating cavity and the third heating cavity wrapped outside the mold cavity are arranged, which are matched with the first heating cavity, heated together from inside and outside, further improve the heating effect, and save energy.

[0023] The above summary is only for the purpose of the description and is not intended to limit in any way. In addition to the above described exemplary aspects, embodiments and features, further aspects, embodiments and features of the present application will be readily apparent to those skilled in the art by reference to the drawings and the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without any creative labor.

[0025] Figure 1 The flowchart of the method of the present application;

[0026] Figure 2 The structural diagram of the present application;

[0027] Figure 3 The structural diagram of the lower shell of the present application;

[0028] Figure 4 Structure diagram of sintering tooling of the present application;

[0029] Figure 5 Structure diagram of lower die plate of the present application;

[0030] Figure 6 Structure diagram of upper die plate of the present application;

[0031] Figure 7 Bottom view structure diagram of upper die plate of the present application;

[0032] Figure 8 Front view structure diagram of the present application;

[0033] Figure 9 A-A sectional view structure diagram of the present application Figure 8 ;

[0034] Figure 10 Structure diagram of sintered brake friction block using sintering method of the present application Figure 1 ;

[0035] Figure 11 Structure diagram of sintered brake friction block using sintering method of the present application Figure 2 .

[0036] Reference signs: 1, pressurized bell jar furnace; 11, upper cover; 12, lower shell; 121, first heating cavity; 13, heat supply pipe; 14, connecting rod; 2, sintering tooling; 21, upper die plate; 211, first limiting rod; 22, lower die plate; 221, die cavity; 222, second limiting rod; 23, communication hole; 24, second heating cavity; 25, third heating cavity. DETAILED DESCRIPTION

[0037] Hereinafter, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0038] It should be noted that the terms "first", "second", "symmetrical", "array" and the like are only used for distinguishing description and position description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "symmetrical" and the like can explicitly or implicitly include one or more of the features; similarly, for some features that are not limited in number by the words "two", "three" and the like, it should be noted that the features also belong to explicitly or implicitly including one or more feature numbers;

[0039] In the present application, unless otherwise explicitly specified and limited, the terms such as "mounting", "connecting", "fixing" and the like shall be understood in a broad sense; for example, it can be fixed connection, or detachable connection, or integral molding; it can be mechanical connection, it can be direct connection, it can be welding, or it can be indirect connection through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specification and drawings in combination with specific circumstances.

[0040] The embodiments of the present application will be described in detail below in combination with the drawings.

[0041] As shown in the drawings, the present application provides a powder metallurgy brake pad friction block sintering method, comprising the following steps: Figures 1-9

[0042] A sintering tool 2 and a pressurized bell jar furnace 1 for matching the sintering tool 2 are provided;

[0043] The friction block is placed inside the sintering tool 2;

[0044] Heat source is supplied to the sintering tool 2 through the heat supply pipe 13, and after sintering and forming, cooling, taking out the finished product, the sintered friction block is obtained;

[0045] The sintering tool 2 comprises an upper die plate 21 with a second heating cavity 24 inside and a lower die plate 22 with a third heating cavity 25 inside, and the lower die plate 22 has a die cavity 221 for limiting the shape of the friction block and a second limiting rod 222;

[0046] The third heating cavity 25 is wrapped outside the die cavity 221;

[0047] The pressurized bell jar furnace 1 comprises an upper cover 11 and a lower shell 12 with a heat supply channel inside, and the upper die plate 21 and the lower die plate 22 are both provided with a communication hole 23 for conveying heat energy, the heat supply channel of the upper cover 11 is communicated with the second heating cavity 24 through the communication hole 23, and the heat supply channel of the lower shell 12 is communicated with the third heating cavity 25 through the communication hole 23, which can further improve the heating effect and achieve the effect of saving energy. The pressurized bell jar furnace 1 further comprises an outer shell for wrapping the above structure and a driving mechanism (not shown in the figure) for driving the upper cover 11 or the lower shell 12 to move through the connecting rod 14. The pressurized bell jar furnace 1 is basically consistent with the prior art, only the above structure is inconsistent;

[0048] The driving mechanism can be any one of hydraulic rod, air cylinder or linear motor, which is only used to drive the upper cover 11 or the lower shell 12 to move.

[0049] ​Specifically, the pressurized bell jar furnace 1 further comprises a plurality of connecting rods 14 for driving the upper cover 11 and / or the lower shell 12 to move, so that the upper cover 11 or the lower shell 12 can be driven to move to perform the sintering work.

[0050] Specifically, the lower shell 12 has a first heating cavity 121 inside, a plurality of sintering tools 2 are arranged, and the plurality of sintering tools 2 are uniformly distributed in the first heating cavity 121, so as to simultaneously sinter a plurality of friction blocks.

[0051] More specifically, the heat supply pipe 13 is in communication with the internal passages of the upper cover 11 and the lower shell 12, so as to deliver heat into the internal passages of the upper cover 11 and the lower shell 12 to complete the sintering work.

[0052] In this embodiment, specifically, the heat supply pipe 13 is in communication with the first heating cavity 121, and after the heat enters the first heating cavity 121, the second heating cavity 24 and the third heating cavity 25 wrapped outside the mold cavity 221 are cooperated to internally and externally heat, so as to improve the heating efficiency.

[0053] In this embodiment, specifically, the upper mold plate 21 is fixed on the upper cover 11, and when the upper cover 11 moves, the upper mold plate 21 can be driven to move together.

[0054] In this embodiment, specifically, the lower mold plate 22 is fixed on the lower shell 12, and when the lower shell 12 moves, the lower mold plate 22 can be driven to move together.

[0055] In this embodiment, specifically, the bottom of the upper mold plate 21 is integrally formed with a plurality of irregular first limiting rods 211, as shown in Figures 10-11 Figures 10-11 The schematic diagram of the finished product after sintering by the sintering tool of the present application.

[0056] In the working process of the present application, first, the material is delivered into the mold cavity 221 of the sintering tool 2, then the upper mold plate 21 is closed and embedded into the lower mold plate 22, at this time, the heat source is supplied into the sintering tool 2 through the heat supply pipe 13, in the delivery process, the heat source enters the internal heat supply passages of the upper cover 11 and the lower shell 12 at the same time and also enters the first heating cavity 121, then the heat source enters the interiors of the second heating cavity 24 and the third heating cavity 25 through the heat supply passages, and the internal and external heatings are cooperated to further improve the heating effect and save energy, through the sintering of the friction block by the method of the present application, the shape of the product after sintering is uniform, the assembly size is stable, and there is no need for further mechanical processing, so that the production efficiency is improved and the stability of the product quality is ensured.

[0057] ​The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of various changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A powder metallurgy brake pad friction block sintering method, characterized in that: The following steps are involved: A sintering tool (2) and a pressurized bell furnace (1) for cooperating with the sintering tool (2) are provided; Placing the friction block inside the sintering tool (2); Supplying heat source to the sintering tool (2) through the heat supply pipe (13), sintering and forming, cooling, and taking out the finished product to obtain a sintered friction block; The sintering tool (2) comprises an upper mold plate (21) having a second heating cavity (24) therein and a lower mold plate (22) having a third heating cavity (25) therein, and the lower mold plate (22) has a mold cavity (221) defining the shape of the friction block and a second limiting rod (222); The third heating cavity (25) is covered on the outside of the mold cavity (221); The pressurized bell furnace (1) comprises an upper cover (11) and a lower shell (12) with a heat supply channel therein, the upper template (21) and the lower template (22) are both provided with a connecting hole (23) for conveying heat energy, the heat supply channel of the upper cover (11) is connected to the second heating chamber (24) through the connecting hole (23), the lower shell (12) has a first heating chamber (121) therein, a plurality of sintering fixtures (2) are provided, and the plurality of sintering fixtures (2) are evenly distributed in the first heating chamber (121), the heat supply channel of the lower shell (12) is connected to the third heating chamber (25) through the connecting hole (23), the heat supply pipe (13) is connected to the first heating chamber (121), and the heat supply pipe (13) is connected to the internal channels of the upper cover (11) and the lower shell (12); The bottom of the upper template (21) is integrally formed with a plurality of irregular first limiting rods (211).

2. The powder metallurgy brake pad friction block sintering method according to claim 1, characterized in that: The pressurized bell furnace (1) further comprises a plurality of connecting rods (14) for driving the upper cover (11) and / or the lower shell (12) to move.

3. The powder metallurgy brake pad friction block sintering method according to claim 1, characterized in that: The upper template (21) is fixed on the upper cover (11).

4. The powder metallurgy brake pad friction block sintering method according to claim 1, characterized in that: The lower template (22) is fixed on the lower shell (12).

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