Simple finishing method for fitting surfaces of shaft parts with tight-fit holes

Abstract

The invention relates to a simple finishing method for a matching surface of a tight-fit hole-shaft part, in particular to a simple and rapid finishing method for the situation that after the hole-shaft matching part is detached, the matching surface is damaged to different degrees, and the functional requirements of an original part are lost. The invention discloses a simple finishing method for a matching surface of a shaft part with a close-fit hole. The simple finishing method comprises the following steps: (1) cleaning and derusting a damaged part; (2) performing surface treatment after finish reaming of the hole surface, and performing axial surface grinding or finish turning; (3) the repaired size is measured, and the deviation of the hole and the deviation of the shaft are calculated respectively; and (4) the shaft surface is ground after being plated with a metal layer, and the original matching precision requirement is met. Compared with the prior art, the method has the following advantages that finish machining with small cutting amount is adopted for matching face holes, grinding clearance matching is carried out after hard chromium plating is carried out on the outer diameter of the shaft part, at least one overhaul period service life can be maintained, and the problems in the engineering manufacturing process are solved in time.

Description

Technical Field

[0001] The invention relates to a simple trimming method for the mating surface of tight-fit hole-shaft parts, in particular to a simple and quick trimming method for the mating surface of the hole-shaft mating parts which is damaged to different degrees after disassembly and loses the functional requirements of the original parts. Background Art

[0002] At present, during aircraft overhaul, some tight-fitting hole-shaft matching parts that do not bear motion loads but have alternating loads have varying degrees of damage on the matching surfaces after disassembly, and have lost the functional requirements of the original parts. In the case of no spare parts for hole-shaft parts, a simple and fast repair method can be used to repair the parts in a very short time to achieve the function. Summary of the invention

[0003] The purpose of the present invention is to provide a simple finishing method for the mating surfaces of tight-fitting hole-shaft parts, so as to solve the problem that during the overhaul period of aircraft, some tight-fitting hole-shaft parts that do not bear dynamic loads but have alternating loads have varying degrees of damage on the mating surfaces after disassembly, thereby losing the functional requirements of the original parts.

[0004] In order to achieve the above object, the present invention adopts the following technical solution: a simple finishing method for the mating surface of tight-fitting hole shaft parts, comprising the following steps:

[0005] (1) Clean and remove rust from damaged parts;

[0006] (2) Surface treatment after fine reaming of the hole surface, and grinding or fine turning of the shaft surface;

[0007] (3) Measure the dimensions after repair and calculate the deviations of the hole and shaft respectively;

[0008] (4) The shaft surface is plated with a metal layer and then ground to meet the original matching accuracy requirements.

[0009] Preferably, the specific steps of step (3) are:

[0010] Measure the dimensions after repair, the actual measured value of the hole diameter is D1, and the actual measured value of the shaft diameter is d1;

[0011] Calculate the hole deviation a=(measured value D1-theoretical value D0) / 2, and the shaft deviation b=(theoretical value d0-measured value d1) / 2.

[0012] Preferably, in step (4), the minimum coating thickness δ=a+b+c is determined, wherein c is a constant of 0.03 to 0.05 mm.

[0013] Preferably, in step (4), the mating surface of the shaft is electroplated according to the minimum coating thickness, and the size after plating is guaranteed to be no less than d1+2δ.

[0014] Preferably, in step (4), the shaft mating surface is ground to d1+2a.

[0015] Preferably, in step (4), the material of the metal layer is hard chromium.

[0016] Preferably, the repaired tight-fit hole shaft parts are assembled by static pressure.

[0017] Compared with the prior art, the present invention has the following advantages: by using finishing with less cutting amount on the mating surface, the outer diameter of the shaft parts is hard chrome plated and then ground to match the clearance, which can maintain the service life of at least one renovation period, and timely solve the problems in the engineering manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of hole and shaft structure in an embodiment of the present invention (a, schematic diagram of hole structure; b, schematic diagram of shaft structure);

[0019] Figure 2 It is a flow chart of an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1-2 The present invention is further described in detail: A simple trimming method for the mating surface of tight-fitting hole shaft parts comprises the following steps:

[0021] (1) Clean and remove rust from damaged parts;

[0022] (2) Surface treatment after fine reaming of the hole surface, and grinding or fine turning of the shaft surface;

[0023] (3) Measure the dimensions after repair and calculate the deviations of the hole and shaft respectively;

[0024] (4) The shaft surface is plated with a metal layer and then ground to meet the original matching accuracy requirements.

[0025] The specific steps are as follows:

[0026] (1) Clean and derust the disassembled parts;

[0027] (2) Repair the mating surfaces and shafts. The holes are repaired by fine reaming, and the shafts are repaired by grinding (or fine turning);

[0028] (3) Measure the dimensions after repair, the actual measured value of the hole diameter is D1, and the actual measured value of the shaft diameter is d1;

[0029] (4) Calculate the hole deviation a = (measured value D1 - theoretical value D0) / 2, and the shaft deviation b = (theoretical value d0 - measured value d1) / 2;

[0030] (5) Determine the minimum coating thickness δ = a + b + c, where c is a constant of 0.03 to 0.05 mm;

[0031] (6) Electroplating hard chrome is performed on the shaft mating surface according to the minimum coating thickness, and the size after plating is guaranteed to be no less than d1+2δ;

[0032] (7) Grind the shaft mating surface to the size of d1+2a.

Claims

1. A simple finishing method for the mating surface of tight-fitting hole-shaft parts, characterized in that: The following steps are involved: (1) Clean and remove rust from damaged parts; (2) Surface treatment after fine reaming of the hole surface, and grinding or fine turning of the shaft surface; (3) Measure the dimensions after repair and calculate the deviations of the hole and shaft respectively; (4) The shaft surface is plated with a metal layer and then ground to meet the original matching accuracy requirements.

2. The simple trimming method for the mating surface of tight-fit hole shaft parts according to claim 1 is characterized in that: The specific steps of step (3) are: Measure the dimensions after repair, the actual measured value of the hole diameter is D1, and the actual measured value of the shaft diameter is d1; Calculate the hole deviation a=(measured value D1-theoretical value D0) / 2, and the shaft deviation b=(theoretical value d0-measured value d1) / 2.

3. The simple trimming method for the mating surface of tight-fit hole shaft parts according to claim 2 is characterized in that: In step (4), the minimum coating thickness δ=a+b+c is determined, where c is a constant of 0.03 to 0.05 mm.

4. The simple trimming method for the mating surface of tight-fit hole shaft parts according to claim 3 is characterized in that: In step (4), the mating surface of the shaft is electroplated according to the minimum coating thickness, and the size after plating is guaranteed to be no less than d1+2δ.

5. The simple trimming method for the mating surface of tight-fit hole shaft parts according to claim 2 is characterized in that: In step (4), the shaft mating surface is ground to d1+2a.

6. The simple finishing method for the mating surface of tight-fit hole shaft parts according to claim 1 is characterized in that: In step (4), the material of the metal layer is hard chromium.

7. The simple finishing method for the mating surface of tight-fit hole shaft parts according to claim 1 is characterized in that: After refurbishment, the tight-fitting hole and shaft parts are assembled by static pressure.

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