Rotary part automatic alignment method suitable for grinding machine equipment

Abstract

The invention discloses a rotary part automatic alignment method suitable for grinding machine equipment. The rotary part automatic alignment method comprises the steps that a zero point positioning system, a hydraulic locking device, a part clamp and a rigid push rod are prepared; completing the assembly of the rotary part, the part clamp and the zero-point positioning system sub-disc in an automatic production line preparation area; the assembly is moved to an automatic production line grinding station to complete locking of the zero-point positioning system sub-disc and the zero-point positioning system mother disc, and rough alignment is completed; the position coordinates of the rotary part are measured, and the position offset is determined; lowering the hydraulic locking device to lower the pressure on the zero-point positioning system mother disc; a rigid push rod is used for micro-correcting the position of a zero-point positioning system mother disc so as to correct the position offset of the rotary part; the measurement process is repeated, and if the offset correction precision does not meet the requirement, correction is carried out again until the offset correction precision meets the requirement; and when the offset correction precision meets the requirement, the hydraulic locking device is adjusted upwards to press the mother disc of the zero-point positioning system till the mother disc is in a complete pressing state, and the automatic alignment process of the rotary part is finished.

Description

Technical Field

[0001] The invention belongs to the technical field of manufacturing parts of aviation engines, and in particular relates to an automatic alignment method for rotary parts suitable for grinding machine equipment. Background Art

[0002] In the manufacturing process of aircraft engine parts, the grinding of rotating parts is inevitable, especially the wheel rotor parts. The grinding accuracy requirements are very strict and generally need to meet the micron level requirements.

[0003] At present, in order to achieve the micron-level grinding accuracy requirements, it is necessary to ensure it through the alignment process before grinding. However, the current alignment process still needs to be completed with manual assistance, and automatic alignment without manual assistance cannot be achieved.

[0004] Specifically, after the workpiece is clamped and fixed to the worktable of the grinder, only rough alignment can be achieved initially by relying on the centering function of the fixture. Subsequently, the workpiece needs to be fine-tuned dynamically by manual dialing and hammering. The fine alignment process is heavily dependent on the proficiency and skill level of the operator, and the work efficiency and final accuracy of the fine alignment are difficult to achieve stable and controllable.

[0005] In addition, more and more aircraft engine parts have been upgraded to be produced by automated production lines, so there is an urgent need for rotary parts to be produced by automated production lines. However, the alignment process before grinding is still restricted by manual auxiliary factors, which makes it unable to meet the basic technical requirements of automated production lines, making the grinding of rotary parts a weak link in the automated production of aircraft engine parts. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides an automatic alignment method for rotating parts of grinding machine equipment. The alignment procedure before grinding completely eliminates the manual assistance link. After the workpiece is placed on the grinder workbench, fully automatic rough alignment and fine alignment can be achieved. It no longer depends on the proficiency and skill level of the operator, and the work efficiency and final accuracy of the fine alignment are also stable and controllable, thereby meeting the basic technical requirements of the automated production line and filling the short board link in the automated production of aircraft engine parts.

[0007] In order to achieve the above object, the present invention adopts the following technical solution: a method for automatically aligning rotating parts suitable for grinding machine equipment, comprising the following steps:

[0008] Step 1: Prepare the alignment tools

[0009] ①. Prepare a zero-point positioning system and place the zero-point positioning system master disc on the grinder workbench;

[0010] ② Prepare a set of hydraulic locking devices, fix the main body of the hydraulic locking device to the grinder workbench, place the locking pressure head of the hydraulic locking device above the edge of the zero point positioning system master disc, and use the locking pressure head to press the zero point positioning system master disc down on the grinder workbench and put it in a fully tightened state;

[0011] ③. Prepare a set of parts fixtures and install them above the sub-disk of the zero-point positioning system;

[0012] ④. Prepare a rigid push rod and place it in the tool library of the grinder;

[0013] Step 2: Place the zero-point positioning system sub-disc with a part fixture in the preparation area of ​​the automated production line, and manually clamp the rotating parts to be ground onto the zero-point positioning system sub-disc through the part fixture;

[0014] Step 3: The robot transfers the zero-point positioning system sub-disc with the rotating parts clamped thereon from the preparation area of ​​the automated production line to the grinding station of the automated production line, and then places the zero-point positioning system sub-disc onto the zero-point positioning system mother disc;

[0015] Step 4: Start the pneumatic locking function of the zero-point positioning system, and lock and fix the zero-point positioning system sub-disc and the zero-point positioning system mother disc together. At this time, the rotary parts are roughly aligned on the grinding machine workbench through the locking and fixing of the zero-point positioning system;

[0016] Step 5: Move the grinding machine spindle to the tool library, complete the pickup of the measuring head, and then move the grinding machine spindle to the rotating parts, use the measuring head to measure the position coordinates of the rotating parts, and automatically determine the position offset of the rotating parts in the X-axis direction and the Y-axis direction based on the measurement results by the CNC system of the grinding machine;

[0017] Step 6: Adjust the downward pressure of the locking head of the hydraulic locking device on the zero point positioning system master disc, so that the zero point positioning system master disc is in an incompletely tightened state;

[0018] Step 7: Move the grinding machine spindle to the tool library, replace the measuring head with a rigid push rod, and then move the grinding machine spindle to the rotating parts until the lower end of the rigid push rod is against the X-axis side surface or the Y-axis side surface of the zero point positioning system master plate;

[0019] Step 8: According to the position offset of the rotary parts in the X-axis direction and the Y-axis direction automatically determined by the CNC system of the grinder, the spindle of the grinder is moved along the X-axis direction or the Y-axis direction, and the rigid push rod is used to make a micro-correction of the position of the zero point positioning system master in the X-axis direction or the Y-axis direction, thereby realizing the correction of the position offset of the rotary parts;

[0020] Step 9: Move the grinding machine spindle to the tool library, replace the rigid push rod with the measuring head, then move the grinding machine spindle to the rotary parts, and use the measuring head again to measure the position coordinates of the rotary parts. If the position offset of the rotary parts meets the set accuracy requirements, directly execute step 10; if the position offset of the rotary parts still does not meet the set accuracy requirements, repeat the position micro-correction process of the zero point positioning system master until the position offset of the rotary parts meets the set accuracy requirements;

[0021] Step 10: Increase the downward pressure of the locking head of the hydraulic locking device on the zero point positioning system master disc, so that the zero point positioning system master disc returns to a fully clamped state, and the automatic alignment process of the rotary parts is completed.

[0022] Beneficial effects of the present invention:

[0023] The automatic alignment method for rotary parts of grinding machine equipment of the present invention completely eliminates the manual assistance link in the alignment process before grinding. After the workpiece is placed on the grinding machine workbench, fully automatic rough alignment and fine alignment can be achieved, which no longer depends on the proficiency and skill level of the operator, and the work efficiency and final accuracy of the fine alignment are also stable and controllable, thereby meeting the basic technical requirements of the automated production line and filling the short board link in the automated production of aircraft engine parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of a rotating part being clamped and fixed to the grinding machine workbench through a part fixture and a zero-point positioning system;

[0025] Figure 2 This is a schematic diagram of measuring the position coordinates of rotating parts by carrying a measuring head on the grinding machine spindle;

[0026] Figure 3 This is a schematic diagram of performing micro-correction of the X-axis position of the master plate of the zero-point positioning system by using a rigid push rod carried by the grinder spindle;

[0027] Figure 4 This is a schematic diagram of using a rigid push rod carried by the grinder spindle to perform micro-correction on the Y-axis position of the master plate of the zero-point positioning system;

[0028] In the figure, 1 is the mother disk of the zero-point positioning system, 2 is the daughter disk of the zero-point positioning system, 3 is the part fixture, 4 is the rotating part, 5 is the grinding machine spindle, 6 is the measuring head, 7 is the rigid push rod, and 8 is the grinding machine worktable. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] An automatic alignment method for rotating parts of a grinding machine, comprising the following steps:

[0031] Step 1: Prepare the alignment tools

[0032] ①. Prepare a zero-point positioning system and place the zero-point positioning system master plate 1 on the grinding machine workbench 8;

[0033] In this embodiment, the positioning error of the zero-point positioning system is no higher than 0.02 mm;

[0034] ② Prepare a set of hydraulic locking devices, fix the main body of the hydraulic locking device to the grinding machine workbench 8, place the locking pressure head of the hydraulic locking device above the edge of the zero point positioning system master disc 1, and use the locking pressure head to press the zero point positioning system master disc 1 down on the grinding machine workbench 8 and put it in a fully tightened state;

[0035] In this embodiment, the pressing force of the locking pressure head on the zero point positioning system master disc 1 is 5000N in the fully pressed state;

[0036] ③. Prepare a set of part fixtures 3, and install the part fixtures 3 above the zero-point positioning system sub-disk 2;

[0037] In this embodiment, the part fixture 3 is a fixture that uses a pressure plate and a cushion block evenly distributed at four points in the circumferential direction;

[0038] ④. Prepare a rigid push rod 7 and place the rigid push rod 7 in the tool library of the grinding machine;

[0039] In this embodiment, the top end of the rigid push rod 7 is provided with a tool handle system adapted to the grinding machine spindle 5, and the bottom end of the rigid push rod 7 is provided with a larger square-shaped rod head;

[0040] Step 2: Place the zero-point positioning system sub-disk 2 with the part fixture 3 in the preparation area of ​​the automated production line, and manually clamp and fix the rotating part 4 to be ground onto the zero-point positioning system sub-disk 2 through the part fixture 3;

[0041] Step 3: The robot transfers the zero-point positioning system sub-disk 2 clamped with the rotary parts 4 from the preparation area of ​​the automated production line to the grinding station of the automated production line, and then places the zero-point positioning system sub-disk 2 on the zero-point positioning system master disk 1;

[0042] Step 4: Start the pneumatic locking function of the zero-point positioning system, and lock and fix the zero-point positioning system sub-disc 2 and the zero-point positioning system mother disc 1 together. At this time, the rotary part 4 is roughly aligned on the grinding machine workbench 8 through the locking and fixing of the zero-point positioning system. Figure 1 As shown;

[0043] In this embodiment, the accuracy of the rough alignment is guaranteed by the positioning accuracy of the zero point positioning system itself, so the accuracy of the rough alignment is not higher than 0.02mm;

[0044] Step 5: Move the grinding machine spindle 5 to the tool library, complete the pickup of the measuring head 6, and then move the grinding machine spindle 5 to the rotating part 4, such as Figure 2 As shown, the position coordinates of the rotating part 4 are measured by the measuring head 6, and the position offset of the rotating part 4 in the X-axis direction and the Y-axis direction is automatically determined by the numerical control system of the grinding machine according to the measurement results;

[0045] In this embodiment, a four-point measurement method is adopted. First, the measuring head 6 is used to measure two points in the X-axis direction and two points in the Y-axis direction of the circumferential outer wall of the rotating part 4. Then, the rotation center coordinates of the rotating part 4 can be automatically converted according to the four-point measurement values. Through the difference between the measured rotation center coordinates of the rotating part 4 and the origin coordinates of the grinding machine worktable 8, the position offset of the rotating part 4 in the X-axis direction and the Y-axis direction can be automatically determined;

[0046] Step 6: Lower the downward pressure of the locking pressure head of the hydraulic locking device on the zero point positioning system master plate 1, so that the zero point positioning system master plate 1 is in an incompletely pressed state;

[0047] In this embodiment, the pressing force of the locking pressure head on the zero point positioning system master disc 1 in the incompletely pressed state is 10N;

[0048] Step 7: Move the grinding machine spindle 5 to the tool library, replace the measuring head 6 with a rigid push rod 7, and then move the grinding machine spindle 5 to the rotating part 4 until the lower end of the rigid push rod 7 is against the X-axis side surface or the Y-axis side surface of the zero point positioning system master plate 1, such as Figure 3 , Figure 4 As shown;

[0049] Step 8: According to the position offset of the rotary part 4 in the X-axis direction and the Y-axis direction automatically determined by the CNC system of the grinder, the grinder spindle 5 is moved along the X-axis direction or the Y-axis direction, and the rigid push rod 7 performs a micro-correction on the position of the zero point positioning system master plate 1 in the X-axis direction or the Y-axis direction, thereby realizing the correction of the position offset of the rotary part 4;

[0050] In this embodiment, the alignment accuracy of the rotating part 4 after the position offset is corrected is not higher than 0.005 mm;

[0051] Step nine: Move the grinding machine spindle 5 to the tool library, replace the rigid push rod 7 with the measuring head 6, then move the grinding machine spindle 5 to the rotary part 4, and re-use the measuring head 6 to measure the position coordinates of the rotary part 4. If the position offset of the rotary part 4 meets the set accuracy requirement, directly execute step ten; if the position offset of the rotary part 4 still does not meet the set accuracy requirement, repeat the position micro-correction process of the zero point positioning system master plate 1 until the position offset of the rotary part 4 meets the set accuracy requirement;

[0052] Step 10: Increase the downward pressure of the locking pressure head of the hydraulic locking device on the zero point positioning system master plate 1 to restore the zero point positioning system master plate 1 to a fully clamped state, and the automatic alignment process of the rotary part 4 is completed.

[0053] The solutions in the embodiments are not intended to limit the protection scope of the present invention. All equivalent implementations or changes that do not deviate from the present invention are included in the protection scope of the present invention.

Claims

1. A method for automatically aligning rotating parts of a grinding machine, characterized in that: The steps include: Step 1: Prepare the alignment tools ①. Prepare a zero-point positioning system and place the zero-point positioning system master disc on the grinder workbench; ② Prepare a set of hydraulic locking devices, fix the main body of the hydraulic locking device to the grinder workbench, place the locking pressure head of the hydraulic locking device above the edge of the zero point positioning system master disc, and use the locking pressure head to press the zero point positioning system master disc down on the grinder workbench and put it in a fully tightened state; ③. Prepare a set of parts fixtures and install them above the sub-disk of the zero-point positioning system; ④. Prepare a rigid push rod and place it in the tool library of the grinder; Step 2: Place the zero-point positioning system sub-disc with a part fixture in the preparation area of ​​the automated production line, and manually clamp the rotating parts to be ground onto the zero-point positioning system sub-disc through the part fixture; Step 3: The robot transfers the zero-point positioning system sub-disc with the rotating parts clamped thereon from the preparation area of ​​the automated production line to the grinding station of the automated production line, and then places the zero-point positioning system sub-disc onto the zero-point positioning system mother disc; Step 4: Start the pneumatic locking function of the zero-point positioning system, and lock and fix the zero-point positioning system sub-disc and the zero-point positioning system mother disc together. At this time, the rotary parts are roughly aligned on the grinding machine workbench through the locking and fixing of the zero-point positioning system; Step 5: Move the grinding machine spindle to the tool library, complete the pickup of the measuring head, and then move the grinding machine spindle to the rotating parts, use the measuring head to measure the position coordinates of the rotating parts, and automatically determine the position offset of the rotating parts in the X-axis direction and the Y-axis direction based on the measurement results by the CNC system of the grinding machine; Step 6: Adjust the downward pressure of the locking pressure head of the hydraulic locking device on the zero point positioning system master disc, so that the zero point positioning system master disc is in an incompletely tightened state; Step 7: Move the grinding machine spindle to the tool library, replace the measuring head with a rigid push rod, and then move the grinding machine spindle to the rotating parts until the lower end of the rigid push rod is against the X-axis side surface or the Y-axis side surface of the zero point positioning system master plate; Step 8: According to the position offset of the rotary parts in the X-axis direction and the Y-axis direction automatically determined by the CNC system of the grinder, the spindle of the grinder is moved along the X-axis direction or the Y-axis direction, and the rigid push rod is used to make a micro-correction of the position of the zero point positioning system master in the X-axis direction or the Y-axis direction, thereby realizing the correction of the position offset of the rotary parts; Step 9: Move the grinding machine spindle to the tool library, replace the rigid push rod with the measuring head, then move the grinding machine spindle to the rotary parts, and use the measuring head again to measure the position coordinates of the rotary parts. If the position offset of the rotary parts meets the set accuracy requirements, directly execute step 10; if the position offset of the rotary parts still does not meet the set accuracy requirements, repeat the position micro-correction process of the zero point positioning system master until the position offset of the rotary parts meets the set accuracy requirements; Step 10: Increase the downward pressure of the locking head of the hydraulic locking device on the zero point positioning system master disc, so that the zero point positioning system master disc returns to a fully clamped state, and the automatic alignment process of the rotary parts is completed.

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