CN212741434U

CN212741434U - Novel quenching mould

Info

Publication number: CN212741434U
Application number: CN202021613021.8U
Authority: CN
Inventors: 姜乐; 温博; 韩经鹏; 唐虎娇; 孙洪斌; 董智鹏
Original assignee: Wafangdian Bearing Group National Bearing Engineering Technology Research Center Co Ltd
Current assignee: Wafangdian Bearing Precision Forging Co ltd
Priority date: 2020-08-06
Filing date: 2020-08-06
Publication date: 2021-03-19
Anticipated expiration: 2030-08-06

Abstract

The utility model discloses a novel quenching mould, which relates to the field of multi-step metal surface treatment process and comprises a mould body with a cooling medium circulation groove, comprising a circular bearing surface, a trapezoidal supporting surface, a cooling medium circulation groove and a base. The inner side surface of the cooling medium circulation groove is an inward-concave cambered surface; the supporting surface is provided with a plurality of inclined grooves which form an angle of 45 degrees with the height direction and have a width of 1/5 of the diameter of the bearing surface; widening the cooling medium circulation groove to be 1/5 of the diameter of the bearing surface; the inclined grooves and the cooling medium circulation grooves are communicated with each other, so that the grooves are continuously arranged in a V shape. The quenching clamping fixture is provided with a new groove on the basis of the original groove by improving the structure of the cooling medium circulation groove, so that the flow quantity of the quenching medium on the rolling surface of the part contacted with the supporting surface of the clamping fixture is increased, the cooling effect can be obviously improved, and the thickness and the uniformity of the hardened layer of the bearing ring are ensured to meet the requirements.

Description

Novel quenching mould

Technical Field

The utility model relates to the field of multi-step metal surface treatment process, in particular to a mould for quenching a bearing ring.

Background

The carburizing heat treatment of the bearing ring needs four procedures of carburizing, primary quenching, secondary quenching and tempering, in order to ensure that a proper carburized layer is left in a final finished product, the bearing ring needs to be ensured to generate smaller deformation and relatively stable size after the carburizing heat treatment, the conventional method is that the bearing ring is placed on a quenching clamping fixture during the secondary quenching, then the whole quenching is carried out, and the deformation and the size stability of the bearing ring are controlled by using the clamping fixture. However, the traditional quenching clamping fixture is heavy in design structure and poor in circulation of quenching medium, so that when a large-wall-thickness part is quenched by using the quenching clamping fixture, cooling liquid in the clamping fixture flows smoothly, the cooling speed is low, and finally, a quenching layer of the ferrule is shallow, so that an ideal effect cannot be achieved, and the requirement of a customer on the product quality is met.

For example, chinese patent application No. 201821120897.1 discloses a combined carburizing and quenching clamping fixture for bearing rings, which comprises an upper conical die, a movable cone, a base, a lifting device, and an inclined iron; the base is sleeved on a bearing surface of the lifting appliance in a penetrating manner, the movable cone is arranged on the base, the quenching ferrule is sleeved on the movable cone, an upper cone die is embedded in the movable cone, and a conical part with the same angle as that of the movable cone is arranged at the lower part of the upper cone die; and an inclined iron is arranged above the upper conical die. Although this technical scheme has solved the problem that the mould was dismantled the difficulty when quenching technology ended, and the lasso makes work piece non-deformable by the mould is whole to be supported, still has two problems: firstly, the quenching mould is only suitable for being hoisted into a heating furnace and is not suitable for the use of a large-size bearing ring; secondly, although grooves for circulating cooling liquid are arranged on two sides of the movable cone, the uniform circulation of the cooling liquid cannot be ensured due to the fluid mechanics, the cooling speed is relatively slow, and the problem that the depth of a hardening layer is not enough or not uniform is easily caused.

Disclosure of Invention

The utility model aims to provide a novel quenching mould to solve the problems mentioned in the background technology.

In order to realize the purpose, the following technical scheme is adopted:

a novel quenching mould comprises a mould body with a cooling medium circulation groove, wherein the mould body comprises a round bearing surface, a trapezoidal supporting surface, the cooling medium circulation groove, an inclined groove and a base. The inner side surface of the cooling medium circulation groove is an inward-concave cambered surface, so that the cooling capacity close to the surface of the part is improved; the supporting surface is provided with a plurality of inclined grooves which form an angle of 45 degrees with the height direction and have a width of 1/5 of the diameter of the bearing surface; the cooling medium circulation groove on the outer side of the bearing surface is widened to be 1/5 of the diameter of the bearing surface; the inclined grooves and the cooling medium circulation grooves are communicated with each other, and the two grooves form a V-shaped continuously arranged groove form.

Preferably, the cross section of the newly-excavated groove on the supporting surface is semi-elliptical, and the ratio of the length to the half axis of the semi-ellipse is 3: 2.

Preferably, the cooling medium circulation grooves are 24 in number, and each groove has an inner diameter of 20 mm.

The beneficial effects of the utility model reside in that: through improving the structure of the original cooling medium circulation groove, namely, cutting a new groove by utilizing the original groove, the flow quantity of the quenching medium on the rolling surface of the part contacted with the supporting surface of the clamping fixture is further increased, the cooling effect is improved, and the effect of improving the thickness and the uniformity of the quenched layer of the bearing ring is finally achieved.

Drawings

FIG. 1 is a side view of a quenching mold of the present invention;

FIG. 2 is a plan view of the quenching mold of the present invention;

FIG. 3 is a longitudinal sectional view of the mold body of the present invention;

the labels in the figure are: 1-a bearing surface, this surface being in contact with the part inner surface; 2-cooling medium circulation groove; 3-the inner side of the groove; 4-an oblique groove; 5-a base; 6-a support surface; 7-mould body.

Detailed Description

The invention will be further explained and explained with reference to the following examples and drawings.

In the embodiment, referring to fig. 1-2, a novel quenching mold comprises a mold body 7 with a cooling medium flow groove 2, wherein the mold body comprises a circular bearing surface, a supporting surface with a trapezoidal longitudinal section, the cooling medium flow groove 2, an inclined groove 4 and a base 5, and is mainly applied to a secondary quenching process of a cylindrical roller bearing. The inner side surface 3 of the groove is an inward concave cambered surface; an inclined groove 4 which forms an angle of 45 degrees with the height direction and has a width of 1/5 of the diameter of the bearing surface is dug on the bearing surface; the number of the cooling medium circulation grooves 2 near the bearing surface 1 is 24, the width of each groove 2 is 1/5 of the diameter of the bearing surface 1, and the inner diameter of each cooling medium circulation groove 2 is 20 mm. The inclined grooves 4 are communicated with the cooling medium circulation grooves 2, and the two grooves are in a V-shaped form in continuous distribution. The cross section of the inclined groove 4 is semi-elliptical, and the ratio of the length to the semi-axis of the semi-ellipse is 3: 2.

Claims

1. The utility model provides a novel quenching mould, includes the mould body of taking coolant circulation slot, the mould body comprises circular loading end, trapezoidal holding surface, coolant circulation slot, oblique slot and base, its characterized in that: the width of the cooling medium circulation groove is 1/5 of the diameter of the bearing surface, and the inner side surface of the cooling medium circulation groove is an inward-concave cambered surface; an inclined groove which forms an angle of 45 degrees with the height direction and has a width of 1/5 of the diameter of the bearing surface is chiseled on the bearing surface; the two grooves are communicated with each other and present a continuously distributed V-shaped arrangement groove form.

2. The novel quenching mould as claimed in claim 1, characterized in that: the cross section of the inclined groove is semi-elliptical, and the ratio of the length to the semi-axis of the semi-ellipse is 3: 2.

3. The novel quenching mould as claimed in claim 1, characterized in that: the number of the cooling medium circulation grooves is 24, and the inner diameter of the cambered surface of each groove is 20 mm.