CN216274274U

CN216274274U - Induction quenching system

Info

Publication number: CN216274274U
Application number: CN202123063179.XU
Authority: CN
Inventors: 刘飞香; 廖金军; 麻成标; 许正根; 刘华; 轩书博; 崔二飚; 马建阳
Original assignee: China Railway Construction Heavy Industry Group Co Ltd
Current assignee: China Railway Construction Heavy Industry Group Co Ltd
Priority date: 2021-12-08
Filing date: 2021-12-08
Publication date: 2022-04-12
Anticipated expiration: 2031-12-08

Abstract

The utility model provides an induction hardening system. Comprises induction quenching equipment and a cooling device; the induction quenching equipment is provided with an inductor; the inductor comprises a first induction section and a second induction section; one end of the first induction section is connected with one end of the second induction section, and induction quenching on the adjacent end face and side face of the workpiece is realized in a combined mode; the cooling device is provided with a water sprayer; the sprinkler comprises a first spray pipe and a second spray pipe; one end of the first spraying pipe is connected with one end of the second spraying pipe. According to the utility model, the first induction section and the second induction section are arranged on the inductor, and the adjacent end surfaces and side surfaces on the workpiece are subjected to induction quenching simultaneously, so that the phenomenon of hardening crack at the joint of the upper end surface and the side surface of the workpiece due to secondary quenching is avoided, and the product yield is reduced; meanwhile, the end face and the side face of the workpiece after induction quenching are cooled in a combined manner by arranging the water sprayer with the first spray pipe and the second spray pipe.

Description

Induction quenching system

Technical Field

The utility model relates to the technical field of part processing, in particular to an induction quenching system.

Background

With the rapid development of urban traffic, railways, water conservancy and municipal engineering, the application of large tunnel shield machines is more extensive. As a core component of the shield machine, the production and manufacture of the large-scale low-speed high-load main bearing play a significant role in prolonging the service life of the shield machine and reducing the engineering cost. The production and manufacture of the main bearing of the large shield machine depend on a series of precise machining processes of all parts, wherein the quenching process is carried out to enable a raceway or a flange of a second outer ring of the main bearing to form a martensite quenching layer with a certain depth, so that the bearing and wear resistance of the main bearing in the operation stage can be improved, and the main bearing becomes an extremely important ring in the production and manufacture process.

Referring to fig. 1, after quenching and tempering, the workpiece 5 (i.e. the second outer ring of the main bearing) radial roller contact surface (side surface) and the retainer wear-resistant contact surface (top end surface) need to be subjected to induction quenching, so that the hardness of the hardened zone 5.1 reaches 55HRC-62HRC, and the effective hardened layer depth is not less than 4 mm.

At present, the quenching of the top end face and the side face connected with the top end face of the workpiece 5 is mainly carried out by respectively quenching by adopting a single-sided inductor, the processing efficiency is low, the production period is long, and the processing cost of a manufacturer is correspondingly increased; meanwhile, when single-side quenching is carried out, secondary quenching at the joint of the top end face and the side face of the workpiece 5 is easy to cause the phenomenon of hardening crack, so that the production yield of products is reduced. In addition, during the second quenching, the surface or the area which is quenched first is subjected to inevitable local tempering, so that soft spots are generated after quenching, and the quality of the product is not guaranteed. And in the induction quenching process, the grooves 5.2 processed on the workpiece 5 are easy to deform due to heating in the induction quenching process.

In view of the foregoing, there is a need for an induction hardening system that solves the problems of the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an induction quenching system to solve the problem that quenching cracks are easy to occur when adjacent end faces and side faces on a workpiece are quenched independently.

In order to achieve the above object, the present invention provides an induction hardening system, comprising an induction hardening apparatus and a cooling device; the induction quenching equipment is provided with an inductor; the inductor comprises a first induction section and a second induction section; one end of the first induction section is connected with one end of the second induction section, and induction quenching on the adjacent end face and side face of the workpiece is realized in a combined mode; the cooling device is provided with a water sprayer; the sprinkler comprises a first spray pipe and a second spray pipe; one end of the first spraying pipe is connected with one end of the second spraying pipe, and cooling after quenching of the adjacent end face and the side face on the workpiece is achieved in a combined mode.

Preferably, the included angle formed by the joint of the first induction section and the second induction section is smaller than the included angle formed by the adjacent end surface and the side surface of the workpiece.

Preferably, the inductor further comprises a magnetizer; and magnetizers are arranged at two ends of the first induction section and the second induction section.

Preferably, the induction hardening apparatus further comprises a connecting device connected to one of the first induction section and the second induction section.

Preferably, a plurality of water spray holes are formed in the side walls of the first spray pipe and the second spray pipe, and the minimum distance between each water spray hole and the joint of the first spray pipe and the second spray pipe is 4.0-9.0 mm.

Preferably, the cooling device further comprises a flexible liquid spraying pipe for performing fixed-point cooling on the workpiece.

Preferably, the induction quenching system further comprises a control module; the control module is respectively connected with the induction quenching equipment and the cooling device.

The technical scheme of the utility model has the following beneficial effects:

(1) according to the utility model, the first induction section and the second induction section are arranged on the inductor, and the adjacent end surfaces and side surfaces on the workpiece are subjected to induction quenching simultaneously, so that the phenomenon of hardening cracks at the joint of the upper end surface and the side surface of the workpiece due to secondary quenching is avoided, and the product yield is reduced; meanwhile, the end face and the side face of the workpiece after induction quenching are cooled in a combined manner by arranging the water sprayer with the first spray pipe and the second spray pipe.

(2) According to the utility model, the included angle of the joint of the first induction section and the second induction section is smaller than the included angle of the adjacent end surface and the side surface on the workpiece, so that the distance between the inductor and the workpiece is changed, and the farther the area on the workpiece close to the joint of the end surface and the side surface is from the inductor, the effect of the sharp angle effect on the workpiece during induction quenching is weakened, and the heating temperature of the quenching area is more uniform.

(3) In the utility model, the inductor is provided with the magnetizer which is used for reducing the magnetic resistance of the magnetic field of the alternating current at the connecting positions of the edge, the end face and the side face of the hardening area of the workpiece and improving the induction hardening efficiency.

(4) In the utility model, the connecting device is connected with the inductor to realize the transmission of alternating current and the function of induction quenching.

(5) According to the utility model, the side walls of the first spray pipe and the second spray pipe are respectively provided with a plurality of water spray holes, the minimum distance between each water spray hole and the joint of the first spray pipe and the second spray pipe is 4.0-9.0 mm, so that the phenomenon that the quenching liquid is directly sprayed at the joint of the top end surface and the side surface of the workpiece (namely the right-angle joint of the quenching area) to cause the crack at the joint of the top end surface and the side surface of the workpiece due to the too high cooling speed is avoided, and the production yield of the workpiece is reduced.

(6) In the utility model, the workpiece is cooled at a fixed point by arranging the flexible liquid spraying pipe, so that the machined groove on the workpiece can be prevented from being deformed due to heating in the induction quenching process.

In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a schematic view of a workpiece structure according to an embodiment of the present application;

FIG. 2 is a schematic illustration of induction hardening of an induction hardening system in an embodiment of the present application;

FIG. 3 is a schematic cooling diagram of an induction hardening system in an embodiment of the present application;

the induction heating device comprises an inductor, a first induction section, a second induction section, a magnetizer, a water sprayer, a first spray pipe, a second spray pipe, a connecting device, a flexible spray pipe, a workpiece, a hardening area, a first induction section, a second induction section, a magnetizer, a second induction section, a workpiece, a second induction section, a workpiece, a second induction section, a workpiece, a third induction section, a fourth induction.

Detailed Description

Embodiments of the utility model will be described in detail below with reference to the drawings, but the utility model can be implemented in many different ways, which are defined and covered by the claims.

Example (b):

referring to fig. 1 to 3, the present embodiment of an induction quenching system is applied to quenching and cooling of the second outer ring of the main bearing of the shield machine.

Referring to fig. 1, a workpiece 5 in this embodiment is used as a second outer ring in a main bearing of a large-sized low-speed heavy-load shield machine, a top end face of the workpiece 5 is in contact with a roller in the bearing, a side face of the workpiece 5 adjacent to the top end face is in contact with a retainer of the roller, and in order to ensure the hardness of the top end face and the side face of the workpiece 5, quenching treatment needs to be performed on the region, so that an L-shaped hardening zone 5.1 is formed on the workpiece 5; the top of the workpiece 5 is provided with a groove 5.2, and care should be taken to avoid the deformation of the groove 5.2 caused by heating during quenching.

An induction hardening system comprises induction hardening equipment and a cooling device; referring to fig. 2, the induction hardening apparatus is provided with an inductor 1; the inductor 1 comprises a first induction section 1.1 and a second induction section 1.2; one end of the first induction section 1.1 is connected with one end of the second induction section 1.2 and is arranged on the outer circumference of the workpiece 5, so that induction quenching on the adjacent end surface and side surface at the top of the workpiece 5 is realized in a combined mode, the phenomenon that the joint of the end surface and the side surface is quenched and cracked due to secondary quenching when the end surface and the side surface of the workpiece 5 are respectively quenched is avoided, and soft spots are also avoided from being generated on a hardening area 5.1 due to local tempering after the secondary quenching; referring to fig. 3, the cooling device is provided with a water sprayer 2; the sprinkler 2 comprises a first spray pipe 2.1 and a second spray pipe 2.2; one end of the first spraying pipe 2.1 is connected with one end of the second spraying pipe 2.2, and cooling of the adjacent end faces and side faces of the workpiece after quenching is achieved in a combined mode.

Referring to fig. 2, an included angle formed by a joint of the first induction section 1.1 and the second induction section 1.2 is smaller than an included angle formed by an adjacent end surface and a side surface of the workpiece 5, that is, smaller than an included angle of the hardening zone 5.1, in this embodiment, an included angle formed by a top end surface and a side surface of the workpiece 5 is a right angle, and an included angle formed by a joint of the first induction section 1.1 and the second induction section 1.2 of the inductor 1 is an acute angle, so that when induction quenching is performed, a corner of the joint of the first induction section 1.1 and the second induction section 1.2 is far away from the joint of the top end surface and the side surface of the workpiece 5, so that an interval between the inductor 1 and the workpiece 5 is changed, and an area on the workpiece 5, which is closer to the joint of the end surface and the side surface, is far away from the inductor 1, an effect of a sharp angle effect on the workpiece 5 during induction quenching is weakened, so that a heating temperature of the hardening zone 5.1 is more uniform. In this embodiment, the distance between the inductor 1 and the workpiece 5 is 1.5mm to 10 mm.

The inductor 1 also comprises a magnetizer 1.3; magnetizers 1.3 are arranged at two ends of the first induction section 1.1 and the second induction section 1.2, so that the magnetic resistance of a magnetic field of alternating current at the connection part of the edge of the hardening area 5.1 and the right angle is reduced, and the induction hardening efficiency is improved. In this embodiment, the inductor 1 is provided with three magnetizers 1.3, and one magnetizer 1.3 is arranged on the corner of the connection part of the first induction section 1.1 and the second induction section 1.2.

The induction quenching equipment further comprises a connecting device 3 connected with one of the first induction section 1.1 and the second induction section 1.2, and the inductor 1 is connected to an alternating current generating device in the induction quenching equipment through the connecting device 3, so that the induction quenching function is realized. In this embodiment, the connecting device 3 is connected to the second induction section 1.2 for the transmission of an alternating current.

Referring to fig. 3, a plurality of water spray holes are respectively arranged on the side walls of the first spray pipe 2.1 and the second spray pipe 2.2, and the minimum distance L between each water spray hole and the joint of the first spray pipe 2.1 and the second spray pipe 2.2 is 4.0mm-9.0mm, so that the phenomenon that the quenching liquid is directly sprayed at the joint of the top end surface and the side surface of the workpiece 5 (namely the right-angle joint of the hardening area 5.1) to cause the crack at the joint of the top end surface and the side surface of the workpiece 5 due to the excessively high cooling speed is avoided, and the production yield of the workpiece 5 is reduced.

Referring to fig. 2, the cooling device further comprises a flexible liquid spray tube 4 for spot cooling of the workpiece 5. In this embodiment, set up flexible hydrojet 4 in the notch department of recess 5.2, in the induction hardening process, carry out the fixed point cooling to the notch of recess 5.2, avoid recess 5.2 to take place to warp because of being heated in the induction hardening process.

The induction quenching system also comprises a control module; the control module is respectively connected with the induction quenching equipment and the cooling device and used for sending signals to the induction quenching equipment and the cooling device and controlling the actions of the induction quenching equipment and the cooling device.

The use method of the induction hardening system comprises the following steps: adjusting the distance between the inductor 1 and the workpiece 5, and arranging a water outlet of the flexible liquid spraying pipe 4 towards the notch of the groove 5.2 on the workpiece 5; rotating the workpiece 5, starting induction quenching equipment, and simultaneously carrying out induction quenching on the end face and the side face of the top of the workpiece 5 by using a first induction section 1.1 and a second induction section 1.2 of the inductor 1; opening a flexible liquid spraying pipe 4 in the cooling device to cool the notch of the groove 5.2 on the workpiece 5; after the induction quenching is finished, a water sprayer 2 of the cooling device is started, so that the first spraying pipe 2.1 and the second spraying pipe 2.2 cool the quenching area 5.1.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An induction hardening system is characterized by comprising induction hardening equipment and a cooling device; the induction quenching equipment is provided with an inductor (1); the inductor (1) comprises a first induction section (1.1) and a second induction section (1.2); one end of the first induction section (1.1) is connected with one end of the second induction section (1.2), and induction quenching on the adjacent end face and side face of the workpiece is realized in a combined manner; the cooling device is provided with a water sprayer (2); the sprinkler (2) comprises a first spray pipe (2.1) and a second spray pipe (2.2); one end of the first spray pipe (2.1) is connected with one end of the second spray pipe (2.2), and cooling of the adjacent end face and side face on the workpiece after quenching is achieved in a combined mode.

2. The induction hardening system of claim 1, wherein the angle between the junction of the first induction section (1.1) and the second induction section (1.2) is smaller than the angle between the adjacent end face and the side face of the workpiece.

3. An induction hardening system according to claim 1, characterized in that the inductor (1) further comprises a magnetic conductor (1.3); both ends of first response section (1.1) and second response section (1.2) all are equipped with magnetizer (1.3).

4. An induction hardening system according to claim 1, characterized in that the induction hardening apparatus further comprises a connection device (3) connected to one of the first induction section (1.1) and the second induction section (1.2).

5. An induction hardening system according to any of claims 1 to 4, characterized in that the side walls of the first (2.1) and second (2.2) showers are provided with a plurality of water spray holes, the minimum distance of which from the junction of the first (2.1) and second (2.2) showers is 4.0mm-9.0 mm.

6. An induction hardening system according to claim 5, characterized in that said cooling means further comprise a flexible liquid spray tube (4) for spot cooling of the workpiece.

7. The induction hardening system of claim 6, further comprising a control module; the control module is respectively connected with the induction quenching equipment and the cooling device.