CN107058699B - A kind of pressure quenching mold component of high-speed rail bearer ring - Google Patents

Abstract

The invention proposes a pressure quenching mold assembly for high-speed rail bearing rings, including a mold and a mold core. The mold includes an array of conical rings with a wide top and a narrow bottom. Narrow conical cylinder, two groups of adjacent conical rings have the same end face radius. Each group of conical rings includes several arc-shaped cone blocks. There are several arc-shaped cone blocks along the axis on the outer peripheral surface The joints of two adjacent arc-shaped convex rings are treated with a circular arc transition. The outer contour is wavy. The mold core includes a positioning rod and a core block. The center of the core block is connected to one end of the positioning rod. The core block It is configured with the inner cavity of the mold. The invention reduces the friction and wear of the pressure quenching mold and prolongs the service life of the pressure quenching mold.

Description

A pressure quenching die assembly for high-speed rail bearing rings

technical field

The invention belongs to the technical field of secondary quenching heat treatment of high-speed rail bearing rings, and in particular relates to a pressure quenching mold assembly of high-speed rail bearing rings.

Background technique

In the secondary quenching heat treatment process for the production of high-speed rail bearing rings, a pressure quenching mold that is in good contact with the inner diameter of the bearing rings is used to ensure the roundness of the rings after secondary quenching and to ensure that the forgings of high-speed rail bearing rings do not shrink and deform after cooling . In actual production, the cooling shrinkage of the high-speed rail bearing ring forging after pressure quenching is closely combined with the pressure quenching die, and it is difficult to separate the high-speed rail bearing ring forging from the pressure quenching die. On the other hand, after repeated use, the size of the pressure quenching die becomes smaller due to friction and wear. Continued use will cause the inner diameter of the high-speed iron bearing ring forging to shrink and become smaller, which cannot guarantee the dimensional accuracy of the high-speed iron bearing ring forging, and reduces the pressure of the pressure quenching die. service life. In addition, scholars such as Wang Shouren radially modularized the pressure quenching mold, which reduced the friction and wear of the pressure quenching mold and facilitated the separation of the pressure quenching mold and the high-speed rail bearing ring. However, the outer surface of the modularized pressure quenching mold fits perfectly with the inner cone surface of the high-speed rail bearing ring, and cannot be applied to the production of high-speed rail bearing ring forgings with different inner cone surfaces. Therefore, it is very important to invent a universal pressure quenching mold suitable for different inner cone surfaces of high-speed iron bearing rings.

Contents of the invention

The object of the present invention is to provide a pressure quenching die assembly for a high-speed iron bearing ring, which reduces the friction and wear of the pressure quenching die and prolongs the service life of the pressure quenching die.

The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a pressure quenching mold assembly for high-speed rail bearing rings, which is characterized in that it includes molds and mold cores, and the molds include groups of conical rings with a wide top and a narrow bottom. The conical ring consists of several arc-shaped conical blocks. The groups of conical rings are spliced up and down through the connecting device to form a conical cylinder with a wide upper part and a narrower lower part. The end faces of the tapered rings have the same radius, and the outer peripheral surface of the arc-shaped cone block is provided with several arc-shaped convex rings along the axis. The outline of the block is wavy, the mold core includes a positioning rod and a core block, the center of the core block is connected to one end of the positioning rod, and the core block is configured with the inner cavity of the mould.

According to the above scheme, the mold core block includes several conical blocks whose cross-sectional radii decrease from top to bottom. The several conical blocks are provided with a central through hole, and the center of the conical block at the bottom is fixedly connected with one end of the positioning rod. The remaining conical blocks are socketed with the positioning rod through the central through hole, and can slide up and down along the positioning rod.

According to the above solution, the connecting device includes several outer hoops and inner hoops, the outer hoops are arranged at the joints of the outer walls of the two adjacent groups of conical rings, and the inner hoops are arranged at the corresponding Adjacent to the junction of the inner walls of the two sets of conical rings.

According to the above solution, the upper surface of the top conical ring of the mold is provided with several notches evenly spaced along the circumferential direction, and a stop platform is provided outside the upper edge of the top conical ring.

The beneficial effects of the present invention are: the present invention provides a pressure quenching mold assembly for high-speed rail bearing rings, the high-speed rail bearing ring pressure quenching mold is radially and axially modularized, and several groups of tapered rings are formed by splicing inner and outer hoops, and the inner The hoop exerts an opening stress on the mold, so that each arc-shaped cone block forms a gap and the mold is pre-tensioned. When the mold is demolded, the mold closing gap is eliminated, which is convenient for the mold to come out smoothly and reduces wear; the pressure quenching mold is put into the high-speed rail through the robot arm claw The inner hole of the bearing ring, the outer conical surface of the mold and the inner conical surface of the high-speed rail bearing ring are in contact, and a line contact is formed between the arc-shaped convex ring and the inner conical surface, which is convenient for demoulding and reduces wear; The rod is put into the inner hole of the pressure quenching mold, so that the core block slides along the inner conical surface of the pressure quenching mold and clings to the pressure quenching mold. By changing the number of conical core blocks, the secondary quenching of high-speed iron bearing ring forgings with different inner diameters can be realized, and the adjustment is flexible. , with a wider scope of application.

Description of drawings

Fig. 1 is an isometric view of a mold according to one embodiment of the present invention.

Fig. 2 is a front view of a mold removal connection device according to an embodiment of the present invention.

Fig. 3 is an isometric view of a mold core according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of assembly of a mold assembly and a high-speed rail bearing ring according to an embodiment of the present invention.

Among them: 1-mold; 2-mold core; 3-high-speed rail bearing ring; 4-cone ring; 5-arc cone block; 6-arc convex ring; 7-positioning rod; Outer hoop; 10-inner hoop; 11-notch; 12-stop platform.

Detailed ways

In order to better understand the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

A pressure quenching mold assembly for high-speed rail bearing rings, including a mold 1 and a mold core 2. The mold includes a set of conical rings 4 with a wide top and a narrow bottom. Each set of conical rings includes several arc-shaped conical blocks 5. Splicing up and down through the connecting device forms a conical cylinder with a wide top and a narrow bottom. The section radii of the groups of conical rings decrease sequentially from top to bottom. The end faces of two groups of adjacent conical rings have the same radius. Several arc convex rings 6 are arranged along the axis on the outer peripheral surface of the outer peripheral surface, and the connection between two adjacent arc convex rings is treated with a circular arc transition. The outer contour of the arc cone block is wavy. The mold core block 8, the center of the mold core block is connected with one end of the positioning rod, and the mold core block is configured with the inner cavity of the mould.

The mold core block consists of several conical blocks whose cross-section radius decreases from top to bottom. Several conical blocks have a central through hole. The center of the conical block at the bottom is fixedly connected with one end of the positioning rod, and the rest of the conical blocks are positioned through the central through hole. The rods are socketed and can slide up and down along the positioning rod.

The connecting device includes several outer hoops 9 and inner hoops 10. The outer hoops are arranged at the joints of the outer walls of the adjacent two groups of conical rings to play the role of connecting and fixing the conical rings. The inner hoops are arranged at the adjacent The joints of the inner walls of the two groups of tapered rings, after installation, exert an outward tension on the tapered rings, so that there is a certain gap between the arc-shaped tapered blocks, and they do not fit completely.

The upper surface of the top tapered ring of the mold is provided with several notches 11 evenly spaced along the circumference to facilitate the grasping and positioning of the mechanical arm claws, and a stopper 12 is provided outside the upper edge of the top tapered ring to facilitate the mold to come out.

When using this mold assembly for pressure quenching of high-speed rail bearings, firstly put the pre-tensioned mold into the inner hole of the high-speed rail bearing ring through the claw of the robot arm, and the outer tapered surface of the mold is in contact with the inner tapered surface of the high-speed rail bearing ring. Put the core blocks into the inner conical hole of the mold, adjust the number of core blocks to adapt to molds with different inner diameters, make the core blocks slide along the inner conical surface of the mold and press them closely, and perform the quenching process of the high-speed rail bearing ring;

After the quenching of the high-speed rail bearing ring is completed, the mold core is taken out by the claw of the robot arm, and the claw of the robot arm is inserted into the notch for positioning, and an inward closing force is applied to the mold to close the mold. A gap is formed between the mold and the high-speed rail bearing ring. At this time, the The mold and the high-speed rail bearing ring are separated and taken out. This method avoids the friction and wear between the mold and the forging of the high-speed rail bearing ring, and prolongs the service life of the mold

The above examples are only demonstrations of the validity and feasibility of the present invention, and are not intended to limit the present invention in any form. Any specific simple changes, equivalent changes and modifications based on the working principle of the present invention still belong to the present invention. within the scope of the invention.

Claims (3)

1. A pressure quenching mold assembly of a high-speed rail bearing ring, characterized in that it comprises a mold and a mold core, and the mold includes a set of tapered rings with upper width and lower width, and each group of tapered rings includes several arc-shaped cone blocks, The groups of conical rings are spliced up and down through the connecting device to form a conical cylinder with a wide top and a narrow bottom. The section radius of the group of conical rings decreases from top to bottom. The connecting device includes several outer hoops and inner hoops, the outer hoops are arranged at the joints of the outer walls of the two adjacent groups of conical rings, and the inner hoops are arranged at the adjacent two groups of conical rings. The joint of the inner wall of the ring, the outer peripheral surface of the arc-shaped cone block is provided with several arc-shaped protruding rings along the axis, and the connection between two adjacent arc-shaped protruding rings is treated with a circular arc transition, and the outer profile of the arc-shaped conical block The line is wavy, the mold core includes a positioning rod and a core block, the center of the core block is connected to one end of the positioning rod, and the core block is configured with the inner cavity of the mold. 2. The pressure quenching mold assembly of a high-speed rail bearing ring according to claim 1, wherein the mold core block includes several conical blocks whose sectional radii gradually decrease from top to bottom, and the several conical blocks There is a central through hole, the center of the conical block at the bottom is fixedly connected with one end of the positioning rod, and the rest of the conical blocks are socketed with the positioning rod through the central through hole, and can slide up and down along the positioning rod. 3. The pressure quenching mold assembly of a high-speed rail bearing ring according to claim 1, wherein the upper surface of the top tapered ring of the mold is provided with several notches evenly spaced along the circumference, and the top cone is A stop platform is provided outside the upper edge of the ring.