CN219074365U

CN219074365U - Powder metallurgy friction ring compacting tool set

Info

Publication number: CN219074365U
Application number: CN202223409789.5U
Authority: CN
Inventors: 陈奎; 徐腈蔓; 张睿; 侯亮; 王型俊
Original assignee: China Railway Longchang Materials Co Ltd
Current assignee: China Railway Longchang Materials Co Ltd
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-05-26
Anticipated expiration: 2032-12-16

Abstract

The utility model discloses a powder metallurgy friction ring pressing die which comprises an upper die, a middle die, a lower die and a core rod, wherein the lower end of the core rod is connected to a central cylinder base of an automatic forming hydraulic machine, the upper end of the core rod is connected with the lower end of the core rod through threads, the lower die is connected to an ejection cylinder base of the automatic forming hydraulic machine and is in clearance fit with the upper end of the core rod, the middle die comprises a middle die core and a middle die sleeve in interference fit with the middle die core, the middle die is fixed on the ejection cylinder of the automatic forming hydraulic machine and is in clearance fit with the lower die, and the upper die is connected to a main cylinder base of the automatic forming hydraulic machine and is in clearance fit with the middle die and the upper end of the core rod. Compared with the prior art, the utility model has the following positive effects: the utility model provides a powder metallurgy friction ring pressing die, which solves the problems that the uniformity of materials is poor, one-step forming is impossible, the production cost is high and the production efficiency is difficult to guarantee in the friction ring preparation process.

Description

Powder metallurgy friction ring compacting tool set

Technical Field

The utility model relates to a powder metallurgy friction ring pressing die.

Background

Friction rings are a component material that is used in power machines to perform a braking function by friction. Because of the structural characteristics of the friction ring, the dual friction surfaces can be not only the upper end surface and the lower end surface of the friction ring, but also the inner arc surface and the outer arc surface of the friction ring. Friction rings are typically manufactured by machining from a large block of pressed stock to meet the design size requirements of the workpiece. However, the process has the problems of low material utilization rate, long processing time and processing period, low production efficiency, high processing cost and unstable product quality.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model provides the powder metallurgy friction ring pressing die which achieves the purpose of one-step forming of friction rings, has high production efficiency, good workpiece quality and low manufacturing cost, and can be matched with an automatic forming hydraulic machine for use.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a powder metallurgy friction ring compacting tool set, including last mould, well mould, lower mould and plug, wherein, the plug lower extreme is connected on the automatic molding hydraulic press center jar base, and the plug upper end passes through threaded connection plug lower extreme, and the lower mould is connected on the automatic molding hydraulic press ejection jar base to with plug upper end clearance fit, well mould include well mould core and with well mould core interference fit's well die sleeve, well mould is fixed on the automatic molding hydraulic press ejection jar, and with lower mould clearance fit, go up the mould and connect on the automatic molding hydraulic press master cylinder base, and with well mould, plug upper end clearance fit.

Compared with the prior art, the utility model has the following positive effects:

the utility model provides a powder metallurgy friction ring pressing die, which solves the problems that the friction ring is poor in material uniformity, incapable of being molded at one time, high in production cost and difficult to ensure in production efficiency in the preparation process, and has the following specific advantages:

(1) The powder metallurgy friction ring pressing die provided by the utility model can realize one-step forming of the friction ring, reduce the machining times and achieve the purposes of optimizing the machining process and improving the production efficiency.

(2) The exhaust holes are formed in the upper die of the powder metallurgy friction ring pressing die, so that the pressing property of a metal composite material can be improved, the distribution uniformity of friction ring materials can be improved, and the quality of a finished product can be improved.

(3) The powder metallurgy friction ring pressing die can realize automatic pressing and batch production with an automatic forming hydraulic machine, improves production efficiency and reduces production cost.

Drawings

The utility model will now be described by way of example and with reference to the accompanying drawings in which:

FIG. 1 is an assembly schematic of a powder metallurgy friction ring pressing die.

Fig. 2 is a schematic diagram of a press forming process of a powder metallurgy friction ring pressing die.

Fig. 3 is a schematic structural view of an upper die of a powder metallurgy friction ring pressing die.

Fig. 4 is a schematic structural view of a die in a powder metallurgy friction ring pressing die.

Fig. 5 is a schematic structural view of a lower die of a powder metallurgy friction ring pressing die.

Fig. 6 is a schematic view of the structure of the lower end of the powder metallurgy friction ring pressing die core rod.

Fig. 7 is a schematic structural view of the upper end of the powder metallurgy friction ring pressing die core rod.

The reference numerals include: 1-upper die, 2-middle die, 3-lower die, 4-core rod lower end, 5-core rod upper end and 6-friction ring raw material.

Detailed Description

A powder metallurgy friction ring pressing die is shown in fig. 1, and comprises an upper die 1, a middle die 2, a lower die 3, a core rod lower end 4 and a core rod upper end 5.

As shown in FIG. 3, the upper die 1 has an overall length of 130mm and comprises an exhaust hole 1-1, a matching section 1-2 and a central through hole 1-3, and is mainly made of alloy die steel materials such as SLD or SKH 9; the diameter of the exhaust hole 1-1 is 3mm, and the exhaust hole mainly plays a role in exhausting, so that the material compressibility is improved, and the product quality is improved; the length of the middle die matching section 1-2 is 75mm, so that the upper die 1 has good strength, and meanwhile, collision with the middle die 2 in the compression molding process is avoided, the die is prevented from being damaged, and the service life is prolonged.

The middle die 2 is shown in fig. 4, and has the overall length of 100mm, and comprises a middle die core 2-1, a hoisting threaded hole 2-2 and a middle die sleeve 2-3, wherein the middle die core 2-1 is mainly made of hard alloy steel materials such as tungsten steel, and the middle die sleeve 2-3 is mainly made of carbon steel or bearing steel; the middle die core 2-1 and the middle die sleeve 2-3 are in interference fit to form a middle die 2; the size of the hoisting threaded hole 2-2 is M12, and the depth is 25mm.

As shown in FIG. 5, the lower die 3 has an overall length of 140mm and comprises a central through hole 3-1 and a matching section 3-2, and is mainly made of alloy die steel materials such as SLD or SKH 9; the length of the matching section 3-2 is 115mm, so that the lower die 3 can not be separated from the middle die 2 in the using process.

The lower end 4 of the core rod is shown in fig. 6, has the overall length of 245mm, comprises a thread section 4-1 and a holding section 4-2, and is mainly made of carbon steel or bearing steel; the thread section 4-1 has the size of M16 and the length of 45mm; the length of the holding section 4-2 is 60mm, the width is 15mm, and the holding section is subjected to flattening or knurling treatment, so that the holding section is convenient to apply force and twist.

The upper end 5 of the core rod is shown in fig. 7, has the overall length of 100mm, comprises a threaded hole 5-1 and is mainly made of cemented carbide steel materials such as tungsten steel; the size of the threaded hole 5-1 is M16, and the depth is 55mm, so that the threaded section 4-1 at the lower end 4 of the core rod can be completely screwed into the threaded hole 5-1.

The whole length of the lower end 4 of the core rod and the upper end 5 of the core rod after being connected in a threaded mode is 297mm.

After the upper die 1, the middle die 2, the lower die 3, the lower end 4 of the core rod and the upper end 5 of the core rod are processed, rust prevention and demagnetization process treatment is carried out, and the surface roughness Ra of the mutually matched sections and the forming positions of all the dies is 0.2 so as to reduce friction force generated in the pressing process.

The die of the utility model is installed and pressed as follows:

(1) The installation process comprises the following steps: the lower end 4 of the core rod is connected to the base of the central cylinder of the hydraulic machine, the upper end 5 of the core rod is connected with the lower end 4 of the core rod through threads, the lower die 3 is connected to the base of the ejection cylinder and is in clearance fit with the upper end 5 of the core rod, the middle die 2 is fixed to the ejection cylinder and is in clearance fit with the lower die 3, the upper die 1 is connected to the base of the main cylinder, is positioned through the middle die 2 and is in clearance fit with the middle die 2 and the upper end 5 of the core rod, the center lines of the upper die 1, the middle die 2, the lower die 3, the lower end 4 of the core rod and the upper end 5 of the core rod are overlapped, and parameters of a control panel of the hydraulic machine are adjusted so that molding surfaces of the upper end 5 of the core rod and the lower die 3 and the upper end face of the middle die 2 are on the same horizontal plane and can reciprocate under the driving of the hydraulic cylinder.

(2) The pressing process comprises the following steps:

the whole pressing process is realized by adjusting a press control panel. Firstly, setting the pressing pressure of a friction ring to 1600-1800 MPa; secondly, the middle die 2 is lifted by 80mm by the ejection of the ejection cylinder, the friction ring raw material 6 is slowly poured into the ejection cylinder, the raw material is scraped to be flat, the whole pressing die cavity is filled, and the middle die 2 is lifted by 2mm by the ejection of the ejection cylinder; thirdly, the master cylinder slowly moves down the upper die 1 and presses the middle die 2 by about 40mm; from time to time, floating pressing to enable the pressing pressure to reach a set pressure value, and keeping the pressure for 30 seconds, wherein the pressing forming process is shown in fig. 2; finally, unloading the pressure of the main cylinder to below 0.3MPa, taking out the product according to the sequence of returning the middle die 2 to the initial position by the return of the ejection cylinder, returning the upper die 1 to the initial position by the return of the main cylinder and returning the upper end 5 of the core rod to the initial position by the return of the central cylinder, and obtaining the powder metallurgy friction ring.

Claims

1. A powder metallurgy friction ring compacting die is characterized in that: the automatic forming hydraulic press comprises an upper die, a middle die, a lower die and a core rod, wherein the lower end of the core rod is connected to a central cylinder base of the automatic forming hydraulic press, the upper end of the core rod is connected to the lower end of the core rod through threads, the lower die is connected to an ejection cylinder base of the automatic forming hydraulic press and is in clearance fit with the upper end of the core rod, the middle die comprises a middle die core and a middle die sleeve in interference fit with the middle die core, the middle die is fixed to the ejection cylinder of the automatic forming hydraulic press and is in clearance fit with the lower die, and the upper die is connected to a main cylinder base of the automatic forming hydraulic press and is in clearance fit with the middle die and the upper end of the core rod.

2. A powder metallurgy friction ring pressing die according to claim 1, wherein: the upper die is provided with an exhaust hole.

3. A powder metallurgy friction ring pressing die according to claim 1, wherein: the overall length of the upper die is 130mm, and the length of the matching section of the middle die is 75mm.

4. A powder metallurgy friction ring pressing die according to claim 1, wherein: and a hoisting threaded hole is formed in the middle die sleeve.

5. A powder metallurgy friction ring pressing die according to claim 1, wherein: the whole length of the lower die is 140mm, and the length of the matching section of the lower die and the middle die is 115mm.

6. A powder metallurgy friction ring pressing die according to claim 1, wherein: the overall length of the upper end of the core rod is 100mm, and the overall length of the lower end of the core rod and the upper end of the core rod after threaded connection is 297mm.

7. The powder metallurgy friction ring pressing die according to claim 6, wherein: the size of the threaded hole at the upper end of the core rod is M16, and the depth is 55mm; the size of the thread section at the lower end of the core rod is M16, and the length is 45mm.

8. A powder metallurgy friction ring pressing die according to claim 1, wherein: the lower end of the core rod is provided with a holding section.

9. A powder metallurgy friction ring pressing die according to claim 1, wherein: the surface roughness Ra of the mutually matched sections and the molding positions of the mold is 0.2.