CN104440408A - Novel grinding machining method of secondary nozzle-class precision part - Google Patents

Abstract

The invention discloses a novel grinding machining method of a secondary nozzle-class precision part. A numerical control internal grinding machine and a CBN material grinding head are adopted. The novel grinding machining method includes the following steps that (1) an outer circular groove is clamped through a main shaft spring clamping head, and a left end surface, a left end surface outer circle, an inner hole and an inner hole tapered surface are machined; (2) a left end surface outer circle of a part is clamped through a chuck, the left end surface of the part serves as the benchmark, and then a right end surface outer circle, a right end surface tapered surface and a small end surface are ground. The novel grinding machining method of the secondary nozzle-class precision part has the advantages that the five work procedures of grinding an inner cavity, grinding an outer circle, grinding a small end surface, grinding a large end surface and lapping an inner cavity hole in a traditional process method are integrated into the two work procedures of grinding a large end surface outer circle and inner cavity and grinding a small end surface outer circle and outer taper, the machining procedures are centralized, a large amount of dimension chain calculation is avoided, the machining accuracy of the part is improved, the part is made to meet the size and accuracy requirements of a design drawing, the machining period of the part is shortened at the same time, and the machining efficiency of the part is improved.

Description

A kind of novel grinding processing method of cap jet class precision part

Technical field

The present invention relates to aero engine technology field, is a kind of grinding processing method specifically.

Technical background

Cap jet part is small-sized precise part, volume of part is little, material hardness high (HRC >=50), design of part is complicated, dimensional accuracy is high, existing cap jet class precision part cylindrical inner chamber mainly adopts the processing method of the hand lapping in Conventional processing methods, comprise and grind inner chamber, cylindrical grinding, grind small end face, grind large end face, lappingout lumen orifice five processes, operation is disperseed, positioning datum changes the calculating simultaneously needing to carry out Complex Dimensional Chain Analyses repeatedly, defective be mainly manifested in three in process in: technical conditions are defective, surface smoothness is defective, off-dimension, operation break-down processing simultaneously makes the process-cycle of part long, and production efficiency is low.

Summary of the invention

For solving the problems of the technologies described above, the object of this invention is to provide a kind of cap jet class precision part grinding processing method, concrete technical scheme is as follows:

A novel grinding processing method for cap jet class precision part, comprises the steps: to adopt numeral-controlled internal grinder and CBN material bistrique, specifically comprises as follows:

(1) main shaft spring chuck clamping peripheral groove is adopted, processing left side, left side cylindrical, endoporus and the endoporus conical surface;

(2) chuck holding parts left side cylindrical is adopted, with part left side for benchmark, grinding right side cylindrical, right side taper face and small end face;

In described step (1), main shaft spring chuck carrys out holding workpiece by opening sleeve; Described opening sleeve adopts same internal grinder to process in advance, after adding the cylindrical and endoporus grinding-shaping ensureing opening sleeve man-hour, is cut open with Linear cut; Need before using to check jitter values, ensure that jitter values is less than 0.001.

Described numeral-controlled internal grinder adopts Switzerland to breathe out very company's T RIPET TST120 type internal grinder.

Advantage of the present invention is: by grinding inner chamber, cylindrical grinding in Conventional processing methods, grind small end face, grind large end face, lappingout lumen orifice five processes merges into mill large end face cylindrical and inner chamber, mill small end face cylindrical and outer cone two procedures, manufacturing procedure is concentrated, avoid a large amount of dimension chain calculating, improve the machining accuracy of part, part is made to meet detail of design size, required precision, shorten the process-cycle of part simultaneously, improve the working (machining) efficiency of part.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of step (1) processing cap jet part;

Fig. 2 is the schematic diagram of step (2) processing cap jet part.

Detailed description of the invention

Illustrate the present invention below in conjunction with accompanying drawing, the present embodiment adopts Switzerland to breathe out very company's T RIPET TST120 type internal grinder and CBN material bistrique, and concrete steps are as follows:

(1) as shown in Figure 1, main shaft spring chuck clamping peripheral groove 3 is adopted, processing left side 1, left side cylindrical 2, endoporus 4 and the endoporus conical surface 5;

In described step (1), main shaft spring chuck carrys out holding workpiece by opening sleeve 10; Described opening sleeve 10 adopts same internal grinder to process in advance, after adding the cylindrical and endoporus grinding-shaping ensureing opening sleeve 10 man-hour, is cut open with Linear cut; Need before using to check jitter values, ensure that jitter values is less than 0.001.

Due to this piece surface precision and fineness all very high, also very high to the requirement of bistrique used, adopt traditional bistrique to meet processing request, CBN (cubic boron nitride) bistrique that the present invention adopts Switzerland to produce carries out grinding.CBN than conventional abrasive material more firmly, more wear-resisting, have very high heat diffusion member, this characteristic makes super hard abrasive have the person's character of " cold machining ".The abrasion resistance of super hard abrasive is also better than conventional abrasive material greatly.

CBN is most suitable for processing ferrous material, particularly requiring the occasion keeping grinding wheel shape for a long time, as the grinding of bearing inner race.In addition, CBN is comparatively suitable for the operation infrequently changing emery wheel, because small lot and emery wheel are changed, all will repair when mounted, easily cause emery wheel consumption.

The present invention adds and adopts man-hour composite grinding to process, and realize from roughing, semifinishing, accurately machined process, this processing mode can improve the efficiency of processing parts, improves cutting-tool's used life, thus improves surface luminous intensity and the machining accuracy of part,

Add the end face of cylindricalo grinding in man-hour emery wheel for grinding work piece.Need cylindrical and two end faces of trimming wheel.Therefore use G265 (cylindrical of trimming wheel and two end faces) instruction.Each trim amount is 0.01mm, and repairing speed is F300.CBN inner hole grinding emery wheel is used for inner hole grinding and interior cell size face, so use G269 (profile crushing circulation) to repair, each trim amount is 0.05mm, and trimming speed is F50.

Machined parameters is as follows: when grinding cylindrical and end face, workpiece rotational frequency 500 revs/min, and grinding wheel speed is 35m/s, and lateral feed corase grind is 0.005mm/s, refines as 0.003mm/s.During grinding inner chamber, workpiece rotational frequency 1000 revs/min.Grinding wheel speed is 1000 revs/min, and lateral feed corase grind is 0.003mm/s, refines as 0.001mm/s.Feed speed is F50, and this work step have invoked Q7 variable to revise length direction and diametric deviation, namely adjusts length and the diameter dimension of actual grinding by X and the Z value of adjustment Q7.

(2) as shown in Figure 2, chuck 11 holding parts left side cylindrical 2 is adopted, with part left side 1 for benchmark, grinding right side cylindrical 7, right side taper face 8 and small end face 6;

Machined parameters is as follows: when grinding circle end face and the conical surface, workpiece rotational frequency 500 revs/min.Grinding wheel speed is 30m/s, and lateral feed corase grind is 0.003mm/s, refines as 0.001m/s.Feed speed is F200, and shifting amount is lmm (I=lmm), and empty feed number of times is 3 times.This work step have invoked variable Q4.The size of diameter is adjusted by the X of adjustment variable Q4.

Claims (2)

1. a novel grinding processing method for cap jet class precision part, adopts numeral-controlled internal grinder and CBN material bistrique, it is characterized in that comprising the steps: specifically comprising as follows:

(1) main shaft spring chuck clamping peripheral groove is adopted, processing left side, left side cylindrical, endoporus and the endoporus conical surface;

(2) chuck holding parts left side cylindrical is adopted, with part left side for benchmark, grinding right side cylindrical, right side taper face and small end face;

In described step (1), main shaft spring chuck carrys out holding workpiece by opening sleeve; Described opening sleeve adopts same internal grinder to process in advance, after adding the cylindrical and endoporus grinding-shaping ensureing opening sleeve man-hour, is cut open with Linear cut; Need before using to check jitter values, ensure that jitter values is less than 0.001.

2. the novel grinding processing method of cap jet class precision part according to claim 1, is characterized in that: described numeral-controlled internal grinder adopts Switzerland to breathe out very company's T RIPET TST120 type internal grinder.