Process method for controlling projection detection value of barrel shaft of high-vortex drum

Abstract

The invention provides a process method for controlling a projection detection value of a high-vortex drum shaft, which comprises the following steps: application of a special clamp: the special clamp is composed of an upper part and a lower part, a lower positioning and pressing structure is provided with a limiting structure with a positioning lock, the surface of the clamp is fixed on a machine tool, the pressing structure on the clamp and the upper end surface of the drum shaft are mounted, and the special clamp is used for clamping the drum shaft; and the positioning lock is matched with a mounting hole in the upper end face of the drum shaft, and then the bolt is tightened to tightly press the pressing plate. And the planeness and the parallelism of the front end face and the rear end face of the polished drum shaft are detected through a three-coordinate detection machine. The method for grinding and aligning the drum shaft comprises the steps that the drum shaft needs to be ground on a numerical control vertical grinding machine, the drum shaft is installed on a clamp, and then the drum shaft is aligned. The method has the advantages that the repair qualification rate of the drum shaft is increased to 90% or above, strict assembly requirements of parts are met, the method plays a great role in reducing the rework rate of the parts, the application effect is good, and the economic benefit is good.

Description

Technical Field

[0001] The invention relates to the technical field of aeroengines, and in particular to a process method for controlling a projection detection value of a high-turbo drum shaft. Background Art

[0002] With the continuous development of aircraft engine technology, people pay more attention to the processing quality control of engine parts. Especially in the production process, if the rework rate of parts is high, it will seriously affect the production progress. In order to strictly control the rework rate of parts, the drum shaft has added new control requirements for the runout of the assembly stop and the reference surface after inspection, and the double high point runout of the front and rear end faces of the superimposed projection inspection is not greater than 0.01. Initially, the repair method of the old tooling was adopted, and the pass rate was less than 50%. The repaired parts are still unqualified after the assembly inspection, and need to be disassembled and reworked again. Some parts even need to be reworked multiple times, which seriously affects the production progress. Therefore, the parts processed according to the original process method cannot fully meet the strict assembly control requirements. Summary of the invention

[0003] The purpose of the present invention is to increase the repair qualification rate of drum shaft to more than 90% by using a special fixture, adding grinding and repairing of the end face, and grinding and aligning the drum shaft. The strict assembly requirements of parts are met and the rework rate of parts is reduced. The drum shaft adopts a process method for controlling the projection detection value of the high-vortex drum shaft to achieve the goals of improving the rework quality, processing efficiency and shortening the production cycle of the drum shaft.

[0004] The present invention provides a process method for controlling the projection detection value of a high-vortex drum shaft, which is characterized by:

[0005] include:

[0006] (1) Application of special fixtures:

[0007] The special fixture consists of two parts, the lower part and the lower part. The positioning and clamping structure at the bottom has a limiting structure of the positioning lock 4. Fix the fixture surface 1 on the machine tool, then install the lower end face of the drum shaft at the bottom of the fixture, match the mounting hole at the lower end face of the drum shaft with the positioning lock 4 at the bottom of the fixture, and then press with the pressing plate 3. Then install the clamping structure 2 on the fixture with the upper end face of the drum shaft, match the positioning lock 6 with the mounting hole at the upper end face of the drum shaft, and then tighten the bolts to press the pressing plate 5.

[0008] The special clamp has two clamping and positioning structures, one above and one below. There is a circle of positioning pins on the bottom surface of the special clamp, which match the positioning holes on the lower end surface of the drum shaft. After clamping, the diameter of the mounting edge of the lower end surface of the drum shaft can be concentric with the center diameter of the positioning hole on the lower end surface. The upper clamping and positioning part clamps and positions the upper end surface of the drum shaft, and the upper clamping and positioning part also has an angular correction function. The positioning pins for the upper clamping and positioning match the positioning holes on the upper end surface of the drum shaft. After clamping, the diameter of the mounting edge of the upper end surface of the drum shaft can be concentric with the center diameter of the positioning hole on the upper end surface, and the drum shaft will not be deformed during the rework process.

[0009] (2) Increase the grinding repair of the end surface:

[0010] The front and rear end faces of the drum shaft are the reference surfaces for the runout of the assembly stop. The runout of the assembly stop is greatly affected by the flatness of the end face. Before repairing the runout of the assembly stop, repair the front and rear end faces of the drum shaft first.

[0011] The steps for grinding and repairing the front and rear end faces of the drum shaft are: three-coordinate measurement - grinding end face - cleaning - returning parts - grinding end face - cleaning - returning parts.

[0012] Grinding and grinding the end face, testing the end face of the unqualified drum shaft, there will be three situations after passing the test:

[0013] 1. There are high points on the end face, and the flatness of the front and rear end faces is unqualified;

[0014] 2. The parallelism of the front and rear end faces is unqualified;

[0015] 3. There are high points on the end face, the flatness is unqualified, and the parallelism of the front and rear end faces is unqualified;

[0016] If the drum shaft is in the first case, the end face of the drum shaft with high points needs to be ground and repaired until the flatness of the front and rear end faces meets the requirements.

[0017] If the drum shaft is the second case, it is necessary to use a CNC vertical grinder to grind the drum shaft until it meets the technical requirements for the parallelism of the front and rear end faces.

[0018] If the drum shaft is in the first or second case, the end face with high points on the drum shaft must be ground and repaired first, so that the flatness of the front and rear end faces meet the requirements, and then the drum shaft is ground using a CNC vertical grinder until it meets the technical requirements for the parallelism of the front and rear end faces.

[0019] When grinding the drum shaft, measure the thickness of the grinding mounting edge and the total height of the drum shaft. The grinding removal amount should not exceed 0.03mm.

[0020] After grinding, the flatness and parallelism of the front and rear end surfaces of the drum shaft are tested using a three-coordinate measuring machine.

[0021] (3) Method for aligning the drum shaft during grinding:

[0022] The drum shaft needs to be grinded on a CNC vertical grinder. First, place the fixture flat on the grinder workbench and install the drum shaft on the fixture. Then align the drum shaft and make sure that the radial runout of the drum shaft is no more than 0.005. After alignment, the CNC vertical grinder turns on the magnetic function and tightens the fixture. Then align the end face runout of the drum shaft, observe the end face runout, and compare it with the superimposed projection test runout curve.

[0023] If the high point of the drum shaft end face runout and the superimposed projection detection runout curve angle can completely correspond, grinding can be performed directly until the drum shaft end face runout is qualified. If the high point of the drum shaft end face runout and the superimposed projection detection runout curve angle cannot completely correspond, the magnetic function needs to be turned off and a copper sheet is used to plug the low point angle position at the bottom of the fixture. Then turn on the magnetic function again and tighten the fixture. Then align the drum shaft until the high point of the drum shaft end face runout and the superimposed projection detection runout curve angle can completely correspond. Then grind the high point until it is qualified.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] The process method for controlling the projection detection value of the high-vortex drum shaft of the present invention improves the process method of the method of aligning the drum shaft by applying a special fixture, adding grinding and repairing of the end surface, and improving the repair qualification rate of the drum shaft to more than 90%, meets the strict assembly requirements of the parts, plays a great role in reducing the rework rate of the parts, has good application effect and good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0027] Figure 1 Schematic diagram of the special fixture structure. DETAILED DESCRIPTION

[0028] The present invention will be further explained below in conjunction with specific implementation plans, but the present invention is not limited thereto. The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the restrictive conditions under which the present invention can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0029] The present invention provides a process method for controlling the projection detection value of a high-vortex drum shaft, which is characterized by:

[0030] include:

[0031] (1) Application of special fixtures:

[0032] The special fixture consists of two parts, the lower part and the lower part. The positioning and clamping structure at the bottom has a limiting structure of the positioning lock 4. Fix the fixture surface 1 on the machine tool, then install the lower end face of the drum shaft at the bottom of the fixture, match the mounting hole at the lower end face of the drum shaft with the positioning lock 4 at the bottom of the fixture, and then press with the pressing plate 3. Then install the clamping structure 2 on the fixture with the upper end face of the drum shaft, match the positioning lock 6 with the mounting hole at the upper end face of the drum shaft, and then tighten the bolts to press the pressing plate 5.

[0033] The special clamp has two clamping and positioning structures, one above and one below. There is a circle of positioning pins on the bottom surface of the special clamp, which match the positioning holes on the lower end surface of the drum shaft. After clamping, the diameter of the mounting edge of the lower end surface of the drum shaft can be concentric with the center diameter of the positioning hole on the lower end surface. The upper clamping and positioning part clamps and positions the upper end surface of the drum shaft, and the upper clamping and positioning part also has an angular correction function. The positioning pins for the upper clamping and positioning match the positioning holes on the upper end surface of the drum shaft. After clamping, the diameter of the mounting edge of the upper end surface of the drum shaft can be concentric with the center diameter of the positioning hole on the upper end surface, and the drum shaft will not be deformed during the rework process.

[0034] (2) Increase the grinding repair of the end surface:

[0035] The front and rear end faces of the drum shaft are the reference surfaces for the runout of the assembly stop. The runout of the assembly stop is greatly affected by the flatness of the end face. Before repairing the runout of the assembly stop, repair the front and rear end faces of the drum shaft first.

[0036] The steps for grinding and repairing the front and rear end faces of the drum shaft are: three-coordinate measurement - grinding end face - cleaning - returning parts - grinding end face - cleaning - returning parts.

[0037] Grinding and grinding the end face, testing the end face of the unqualified drum shaft, there will be three situations after passing the test:

[0038] 1. There are high points on the end face, and the flatness of the front and rear end faces is unqualified;

[0039] 2. The parallelism of the front and rear end faces is unqualified;

[0040] 3. There are high points on the end face, the flatness is unqualified, and the parallelism of the front and rear end faces is unqualified;

[0041] If the drum shaft is in the first case, the end face of the drum shaft with high points needs to be ground and repaired until the flatness of the front and rear end faces meets the requirements.

[0042] If the drum shaft is the second case, it is necessary to use a CNC vertical grinder to grind the drum shaft until it meets the technical requirements for the parallelism of the front and rear end faces.

[0043] If the drum shaft is in the first or second case, the end face with high points on the drum shaft must be ground and repaired first, so that the flatness of the front and rear end faces meet the requirements, and then the drum shaft is ground using a CNC vertical grinder until it meets the technical requirements for the parallelism of the front and rear end faces.

[0044] When grinding the drum shaft, measure the thickness of the grinding mounting edge and the total height of the drum shaft. The grinding removal amount should not exceed 0.03mm.

[0045] After grinding, the flatness and parallelism of the front and rear end surfaces of the drum shaft are tested using a three-coordinate measuring machine.

[0046] (3) Method for aligning the drum shaft during grinding:

[0047] The drum shaft needs to be grinded on a CNC vertical grinder. First, place the fixture flat on the grinder workbench and install the drum shaft on the fixture. Then align the drum shaft and make sure that the radial runout of the drum shaft is no more than 0.005. After alignment, the CNC vertical grinder turns on the magnetic function and tightens the fixture. Then align the end face runout of the drum shaft, observe the end face runout, and compare it with the superimposed projection test runout curve.

[0048] If the high point of the drum shaft end face runout and the superimposed projection detection runout curve angle can completely correspond, grinding can be performed directly until the drum shaft end face runout is qualified. If the high point of the drum shaft end face runout and the superimposed projection detection runout curve angle cannot completely correspond, the magnetic function needs to be turned off and a copper sheet is used to plug the low point angle position at the bottom of the fixture. Then turn on the magnetic function again and tighten the fixture. Then align the drum shaft until the high point of the drum shaft end face runout and the superimposed projection detection runout curve angle can completely correspond. Then grind the high point until it is qualified.

[0049] Matters not covered by the present invention are known technologies.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A process for controlling the projection detection value of a high-pressure drum shaft, characterized in that: Includes the following parts: (1) Application of special fixtures: The special clamp is composed of two parts, the lower part and the lower part. The positioning and clamping structure at the lower part has a limiting structure of a positioning lock (4). The clamp surface (1) is fixed on the machine tool, and then the lower end face of the drum shaft is installed at the lower part of the clamp. The mounting hole at the lower end face of the drum shaft is matched with the positioning lock (4) at the lower part of the clamp, and then the clamp is clamped with a pressing plate (3); then the clamping structure (2) at the upper end face of the drum shaft is installed, and the positioning lock (6) is matched with the mounting hole at the upper end face of the drum shaft, and then the bolts are tightened to clamp the pressing plate (5); The special clamp has two clamping and positioning structures, one above and one below. There is a circle of positioning pins on the bottom surface of the special clamp, which match the positioning holes on the lower end surface of the drum shaft. After clamping, the diameter of the mounting edge of the lower end surface of the drum shaft can be concentric with the center diameter of the positioning hole on the lower end surface. The upper clamping and positioning part clamps and positions the upper end surface of the drum shaft, and the upper clamping and positioning part also has an angular correction function. The positioning pins for the upper clamping and positioning match the positioning holes on the upper end surface of the drum shaft. After clamping, the diameter of the mounting edge of the upper end surface of the drum shaft can be concentric with the center diameter of the positioning hole on the upper end surface, and the drum shaft will not be deformed during the rework process. (2) Increase the grinding repair of the end surface: The steps of grinding and repairing the front and rear end faces of the drum shaft are: three-coordinate measurement - grinding end face - cleaning - returning parts - grinding end face - cleaning - returning parts; Grinding and grinding the end face, testing the end face of the unqualified drum shaft, there will be three situations after passing the test:

1. There are high points on the end face, and the flatness of the front and rear end faces is unqualified; 2. The parallelism of the front and rear end faces is unqualified; 3. There are high points on the end face, the flatness is unqualified, and the parallelism of the front and rear end faces is unqualified; If the drum shaft is in the first case, the end surface of the drum shaft with high points needs to be ground and repaired until the flatness of the front and rear end surfaces meets the requirements; If the drum shaft is the second case, it is necessary to use a CNC vertical grinder to grind the drum shaft until it meets the technical requirements for the parallelism of the front and rear ends; If the drum shaft is in the first or second case, the end face of the drum shaft with high points must be ground and repaired first, so that the flatness of the front and rear end faces meets the requirements, and then the drum shaft is ground using a CNC vertical grinder until it meets the technical requirements for the parallelism of the front and rear end faces; When grinding the drum shaft, measure the thickness of the grinding mounting edge and the total height of the drum shaft. The grinding removal amount should not exceed 0.03mm. After grinding, the flatness and parallelism of the front and rear end surfaces of the drum shaft are tested using a three-coordinate measuring machine.

2. The process method for controlling the high-vortex drum shaft projection detection value according to claim 1 is characterized in that: Method for aligning drum shaft grinding: The drum shaft needs to be grinded on a CNC vertical grinder. First, place the fixture flat on the grinder workbench and install the drum shaft on the fixture. Then align the drum shaft and make sure that the radial runout of the drum shaft is not greater than 0.

005. After alignment, the CNC vertical grinder turns on the magnetic function to tighten the fixture. Then align the end face runout of the drum shaft and observe the end face runout, and compare it with the superimposed projection test runout curve. If the high point of the end face runout of the drum shaft and the superimposed projection test runout curve can be completely aligned, the test result will be better. If the angular direction of the high point of the end face runout of the drum shaft is not completely consistent with the angular direction of the superimposed projection detection runout curve, the magnetic function needs to be turned off, and a copper sheet is used to fill the low point angle at the bottom of the fixture; then the magnetic function is turned on again to tighten the fixture; the drum shaft is then aligned until the high point of the end face runout of the drum shaft is completely consistent with the angular direction of the superimposed projection detection runout curve; then the high point is ground until it is qualified.

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