CN112475825B

CN112475825B - Machining method for stepped ring groove of sliding bearing of supercharger

Info

Publication number: CN112475825B
Application number: CN202011307638.1A
Authority: CN
Inventors: 吴�琳; 袁列军; 邹含青; 罗攀; 赵倩
Original assignee: Chongqing Jiangjin Shipbuilding Industry Co Ltd
Current assignee: Chongqing Jiangjin Shipbuilding Industry Co Ltd
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2022-10-28
Anticipated expiration: 2040-11-20
Also published as: CN112475825A

Abstract

The invention discloses a method for machining a stepped ring groove of a sliding bearing of a supercharger, which has higher machining efficiency and lower machining cost. A machining method for a stepped ring groove of a sliding bearing of a supercharger comprises the following steps: s1, preparing a supercharger sliding bearing, wherein four step ring grooves which are uniformly distributed in the circumferential direction are to be machined on the supercharger sliding bearing, and the step ring grooves are integrally fan-shaped and comprise upper layer ring grooves and lower layer ring grooves communicated with the outer side of the upper layer ring grooves; s2, drilling holes at the circle centers of the two ends of each stepped ring groove to be processed with the round corners, and reserving fine processing allowance of the subsequent round corners; s3, milling a sinking platform at the drilling position at one end of the stepped ring groove to serve as a lower tool point of a milling cutter for subsequent rough machining; and S4, respectively carrying out rough machining and finish machining on the upper-layer ring groove and the lower-layer ring groove by using a milling cutter.

Description

Machining method for stepped ring groove of sliding bearing of supercharger

Technical Field

The invention relates to the technical field of superchargers, in particular to a method for machining a stepped ring groove of a sliding bearing of a supercharger.

Background

A supercharger sliding bearing belongs to a bearing precision part, the structure is shown in figure 1 a-figure 2, the material is 15CrNi6, four groups of circumferential stepped ring grooves are arranged on the large end surface of a product, and the surface of the product needs to be carburized and hardened to improve the surface hardness of the material and obtain better wear resistance; the annular groove fillet is smaller, a smaller end milling cutter or keyway milling cutter has to be adopted during milling, the rigidity of the cutter is insufficient, and the cutter is frequently broken, so that the whole processing efficiency is influenced, and the processing cost is high.

The machining method is shown in figure 3, so that when D10 back chipping is finally used, the allowance of a round corner part is too large, the cutter is easy to break edges when the cutter is back chipping, the milling depth is 0.5mm in actual machining, the efficiency is extremely low, and the end face of the cutter is quickly thrown and abraded.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides the method for machining the stepped ring groove of the sliding bearing of the supercharger, which has higher machining efficiency and lower machining cost.

The purpose of the invention is realized as follows:

a machining method for a stepped ring groove of a sliding bearing of a supercharger comprises the following steps:

s1, preparing a supercharger sliding bearing, wherein four step ring grooves which are uniformly distributed in the circumferential direction are to be machined on the supercharger sliding bearing, and the step ring grooves are integrally fan-shaped and comprise upper layer ring grooves and lower layer ring grooves communicated with the outer side of the upper layer ring grooves;

s2, drilling holes at the circle centers of the two ends of each stepped ring groove to be subjected to fillet machining, and reserving fine machining allowance of subsequent fillets;

s3, milling a sinking platform at the drilling position at one end of the stepped ring groove to serve as a lower cutter point of a milling cutter for subsequent rough machining;

and S4, respectively carrying out rough machining and finish machining on the upper-layer ring groove and the lower-layer ring groove by using a milling cutter.

Preferably, in the step S2, a D9 alloy drill is used for drilling, and a margin of 0.5mm is reserved.

Preferably, in the step S3, a D10 end mill is used to mill the sunken table of the D16 in a layered manner, and a lower cutting point is reserved for the D16 mill.

Preferably, in step S4, a D16 milling cutter is used to finish the rough machining of the upper-layer ring groove, a D10 milling cutter is used to finish the rough machining of the lower-layer ring groove, and then a D10 milling cutter is used to finish the finish machining of the upper-layer ring groove and the lower-layer ring groove, and the finish machining of the portions to be rounded at the two ends of each stepped ring groove.

Due to the adoption of the technical scheme, the milling allowance is small during the fine processing of the round corner, the tool is not easy to break, the processing efficiency is higher, and the processing cost is lower.

Drawings

FIG. 1a and FIG. 1b are schematic views of a sliding bearing structure;

FIG. 2a is a schematic view of a stepped ring groove of a sliding bearing;

FIG. 2b isbase:Sub>A schematic cross-sectional view A-A of FIG. 2base:Sub>A;

FIG. 3 is a schematic diagram of the original milling scheme and the allowance of the sliding bearing;

FIG. 4 is a schematic view of a new scheme and allowance of the sliding bearing;

FIG. 5 is a schematic view of a sliding bearing drill point;

fig. 6 shows the machining bottom point of the D10 milling cutter.

Reference numerals

In the attached drawings, 1 is an upper layer ring groove, and 2 is a lower layer ring groove.

Detailed Description

Referring to fig. 4-6, a method for machining a stepped ring groove of a sliding bearing of a supercharger, firstly, from the aspect of the machining method, the application changes the original method mainly based on milling machining, uses combined machining of drilling and milling to remove the allowance at a fillet as much as possible, adopts a combined roughing scheme of D10 and D16 end mills to improve the machining efficiency,

the method comprises the following steps:

the circular groove design fillet is R5, in step S2, adopt D9 alloy drill bit drilling, reserve 0.5mm surplus.

S3, milling a sinking platform at the drilling position at one end of the stepped ring groove to serve as a lower tool point of a milling cutter for subsequent rough machining;

in the step S3, a D10 end mill is adopted to mill a sunken platform of D16 in a layered mode, and a lower tool point is reserved for the D16 end mill.

In the step S4, the rough machining of the upper-layer ring groove (including the part around the fillet) is completed by using a D16 milling cutter, the rough machining of the lower-layer ring groove is completed by using a D10 milling cutter, the finish machining of the upper-layer ring groove and the lower-layer ring groove is completed by using a D10 milling cutter, and the finish machining of the part to be rounded at the two ends of each stepped ring groove is completed.

Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.

Claims

1. A machining method for a stepped ring groove of a sliding bearing of a supercharger is characterized by comprising the following steps of:

s1, preparing a supercharger sliding bearing, wherein four step ring grooves which are uniformly arranged in the circumferential direction are to be machined in the supercharger sliding bearing, and the step ring grooves are integrally fan-shaped and comprise upper-layer ring grooves and lower-layer ring grooves communicated with the outer side of the upper-layer ring grooves;

in the step S2, a D9 alloy drill bit is adopted for drilling, and a margin of 0.5mm is reserved;

in the step S3, a D10 end mill is adopted to mill a D16 sinking platform in a layered mode, and a lower cutter point is reserved for the D16 end mill;

s4, respectively carrying out rough machining and finish machining on the upper-layer ring groove and the lower-layer ring groove by using a milling cutter;

in the step S4, the D16 milling cutter is used to finish the rough machining of the upper-layer ring groove, the D10 milling cutter is used to finish the rough machining of the lower-layer ring groove, and then the D10 milling cutter is used to finish the finish machining of the upper-layer ring groove and the lower-layer ring groove, and the finish machining of the positions of the two ends of each stepped ring groove to be rounded is performed.