A torsion arm part clamping device and method

Abstract

The application provides a torsion arm part clamping device and method. The torsion arm part clamping device comprises a base plate, a clamp and a cushion block assembly, the clamp comprises a first base, a pressing plate, and a pressing rod connected to the first base at one end and connected to the pressing plate at the other end for the pressing plate to apply pressure; the clamp is symmetrically provided with two in the X direction, and an acute angle is formed between the two first bases; the cushion block assembly is arranged between the two clamps, and a plurality of cushion block assemblies are arranged along the Z direction; the cushion block assembly comprises a second base and at least one top rod threadedly connected to the upper end of the second base; and the first base and the second base are installed on the base plate. The application utilizes the online measurement system of a machine tool to realize the ideas of automatic, reliable and efficient alignment and judgment, quickly aligns the part B shaft, ensures that the hole allowance of each end surface is uniform, and reduces the tool engagement problem of profile machining and end surface finishing.

Description

Technical Field

[0001] This invention relates to the field of landing gear processing technology, and in particular to a clamping device and method for torque arm parts. Background Technology

[0002] Torque arm components are important load-bearing parts of aircraft landing gear. These components have three or four lugs, and the lug faces and the holes at both ends have a relatively strict positional relationship. For example, in a typical torque arm component, the perpendicularity between the hole and the lug end face should be guaranteed to be less than 0.05mm, and the parallelism between the two holes should be guaranteed to be less than 0.03mm.

[0003] Torque arm-type parts are rough-machined on a vertical machining center, leaving a 1-1.5mm allowance for the holes and lug end faces, followed by finish machining on a horizontal machining center. When clamping the part for finish machining, a dial indicator is required on the machine tool to ensure the centerlines of the two holes are collinear. Simultaneously, the part's B-axis must be aligned to ensure uniform allowance on each end face and that the tool contact on the part's outer surface is within 0.1mm. Existing clamping devices are simple in structure and cannot meet the positioning requirements of torque arm-type parts during finish machining.

[0004] Furthermore, with the introduction of automated production lines, traditional alignment and clamping methods can no longer meet the demands. Automated lines use offline clamping for loading parts, requiring fully automated alignment and verification of machining allowances for holes and end faces after they enter the line. Traditional manual alignment, on the other hand, typically requires repeated verification, which is complex and tedious. Summary of the Invention

[0005] The purpose of this invention is to provide a torque arm parts clamping device and method with an automatic, reliable, and efficient alignment and judgment mechanism, utilizing the online measurement system of machine tools, specifically for automated production line processing modes. The torque arm parts clamping device is characterized by simple operation, low dependence on human intervention, stability, reliability, and high efficiency, ensuring product processing quality.

[0006] The technical solution of the present invention is: a torque arm part clamping device, comprising a base plate having a length direction Z and a width direction X, a clamp and a pad assembly mounted on the base plate, the clamp comprising a first base, a pressure plate, and a pressure rod having one end connected to the first base and the other end connected to the pressure plate for applying pressure to the pressure plate; two clamps are symmetrically arranged in the X direction, and an acute angle is formed between the two first bases;

[0007] Multiple pad assemblies are arranged between the two clamps, and the multiple pad assemblies are arranged along the Z direction; each pad assembly includes a second base and at least one top rod threaded to the upper end of the second base; the first base and the second base are mounted on the substrate.

[0008] Preferably, the clamp further includes a support rod threaded to one end of the pressure plate, the support rod being vertically arranged, and the bottom of the support rod abutting against the first base.

[0009] Preferably, the support rod includes a threaded section and an optical axis section connected in sequence. The threaded section is threadedly connected to the pressure plate, and a first nut is installed on the threaded section. The first nut abuts against the lower surface of the pressure plate, and the end of the optical axis section away from the threaded section abuts against the first base.

[0010] Preferably, a pressure head is provided on the lower surface of the end of the pressure plate on the two clamps that are close to each other.

[0011] Preferably, the pressure rod is a screw rod, the upper end of the pressure rod extends to the top outer side of the pressure plate, and a first nut and a second nut are installed on the pressure rod. The first nut abuts against the upper surface of the first base, and the second nut abuts against the upper surface of the pressure plate.

[0012] Preferably, the first base is also connected to an abutment rod that can extend and retract horizontally.

[0013] Preferably, the push rod is a screw rod, and a third nut is connected to the push rod, the third nut abutting against the upper surface of the second base.

[0014] Preferably, the second base is cylindrical or has an inverted T-shaped cross-section.

[0015] Preferably, there are two top rods connected to the second base.

[0016] The present invention also provides a method for measuring and aligning a torque arm component clamping device, comprising the following steps:

[0017] Step 1: Clamp the part in the torque arm part clamping device mentioned above, and then put the clamping device into the horizontal machining center.

[0018] Step 2: Establish an initial measurement coordinate system, measure the Z-depth direction of the small end hole of the part, calculate the deflection angle, and accumulate the deflection angle into the B-axis coordinate.

[0019] Step 3: Place the clamping device at the origin B0 of the coordinate system and measure two points around the hole of the part; accumulate the theoretical value of the height difference of the end face of the part into the end face value with the smaller Z value, calculate the theoretical deflection value in the B0 direction, and assign this value to the machine tool common variable;

[0020] Step 4: Rotate the clamping device around the B-axis to 180°, measure the Z-values ​​of the two points in Step 3, add the theoretical height difference of the end face of the part to the end face with the smaller Z-value, calculate the deflection value, add the deflection value to the deflection value in Step S3, and take the average value. Add the average value to the coordinate system.

[0021] Step 5: Reread the coordinate system, rotate the B-axis to the new B0 position, measure the coordinates of the two holes on the lug of the part in the B0 state, calculate the center distance between the two holes, subtract the measured center distance from the theoretical center distance and divide by 2, add the difference to the origin coordinates, and then assign the coordinates to the airport common variables.

[0022] Step 6: Measure the coordinates of the two holes on the reverse side of the part's lug, verify the center distance of the holes, average the Y values ​​of the two holes in state B180 with the Y values ​​in state B0, find the minimum and maximum values ​​in the Y direction, and determine whether the Y deviation exceeds the threshold. If it does, issue an alarm.

[0023] Step 7: Rotate the clamping device around axis B to 90°, measure the actual length of the lug position of the part, assign the value to the common variable, and record the position of the lug measurement point;

[0024] Step 8: Rotate the clamping device around the B-axis to 0°, measure the measurement point from Step 6, offset the Z value by half, and then update the value in the coordinate system.

[0025] Step 9: Detect the difference between the allowance of each end face of the part and the theoretical value. If it exceeds the preset threshold, an alarm will be issued.

[0026] Compared with related technologies, the beneficial effects of the present invention are as follows:

[0027] I. A brand-new torque arm parts clamping device is designed. Through pressing and pushing, the torque arm parts are effectively and stably clamped, reducing vibration during finishing, improving stability, and ensuring machining accuracy.

[0028] 2. Add an abutment rod to the fixture to add an abutment function to limit the position of the part in the horizontal direction, further ensuring the clamping accuracy and improving the machining accuracy;

[0029] 3. The clamps and pads in the torque arm parts clamping device are all connected by screw threads in a purely mechanical manner, which does not require oil or air, and is convenient and quick to adjust;

[0030] Fourth, this invention can quickly align the B-axis of the part, ensuring uniform allowance on each end face and hole, and reducing tool connection problems in the outer shape machining and end face finishing.

[0031] Fifth, this invention enables automatic alignment of the automated production line for torque arm-type parts without human intervention;

[0032] VI. This invention can set multiple alarms, which can avoid misalignment during clamping and improve the quality of part processing. Attached Figure Description

[0033] Figure 1 A three-dimensional structural schematic diagram of the torque arm part clamping device provided by the present invention;

[0034] Figure 2 This is a front view of the torque arm component clamping device provided by the present invention;

[0035] Figure 3 For along Figure 2 AA section view diagram;

[0036] Figure 4 This is a schematic diagram of the probe.

[0037] In the attached diagram: 1. Base plate; 2. Fixture; 21. First base; 211. Base plate; 212. Vertical plate; 213. Horizontal plate; 22. Pressure bar; 23. Pressure plate; 24. Pressure head; 25. Support rod; 251. Threaded section; 252. Optical axis section; 26. Abutment rod; 27. First nut; 28. Second nut; 3. Pad assembly; 31. Second base; 32. Top rod; 33. Third nut; 5. Part; 51. Machined surface. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" used below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0039] like Figure 1 , Figure 2 , Figure 3 As shown, the torque arm component clamping device provided in this embodiment includes a base plate 1, a clamp 2, and a pad assembly 3.

[0040] The substrate 1 has a length direction Z and a width direction X. The substrate 1 is provided with a plurality of mounting holes for mounting the clamp 2 and the pad assembly 3.

[0041] The clamp 2 includes a first base 21, a pressure plate 23, a support rod 25, and a pressure rod 22 connected at one end to the first base 21 and at the other end to the pressure plate 23 for applying pressure to the pressure plate 23. Two clamps 2 are symmetrically arranged in the X direction, with an acute angle between the two first bases 21. A pressure head 24 is provided on the lower surface of the pressure plate 23 on the two clamps 2 at the end closest to each other. The end of the pressure head 24 is hemispherical.

[0042] The first base 21 includes a base plate 211 bolted to the base plate 1, a vertical plate 212 vertically connected to the base plate 211, and a horizontal plate 213 horizontally connected to the vertical plate 212. The lower end of the pressure rod 22 is threaded into a threaded hole at the top of the vertical plate 212, and the extension position of the pressure rod 22 relative to the vertical plate 212 is locked by a first nut 27. A second nut 28 is also connected to the pressure rod 22, and the second nut 28 abuts against the upper surface of the pressure plate 23.

[0043] The pressure plate 23 has a threaded hole at its end away from the pressure head 24 for mounting the support rod 25. The support rod 25 includes a threaded section 251 and a smooth shaft section 252 connected in sequence. The threaded section 251 is threadedly connected to the pressure plate 23, and a first nut 27 is mounted on the threaded section 251. The first nut 27 abuts against the lower surface of the pressure plate 23, and the end of the smooth shaft section 252 away from the threaded section 251 abuts against the horizontal plate 213. The second nut 28 on the pressure rod 22 and the first nut 27 on the support rod 25 together define the position of the pressure plate 23, allowing the pressure plate 23 to apply downward pressure to the part and clamp the part.

[0044] The first base 21 also has a horizontally retractable abutment rod 26 connected to its upright plate 212. The abutment rod 26 is a screw rod, and its retraction position is limited by a first nut 27.

[0045] Multiple pad assemblies 3 are arranged between the two clamps 2, and the multiple pad assemblies 3 are arranged along the Z direction. Each pad assembly 3 includes a second base 31 and at least one push rod 32 threadedly connected to the upper end of the second base 31. One, two, or more push rods 32 can be installed according to the clamping requirements of the part. The push rod 32 is a screw, and a third nut 33 is connected to the push rod 32, the third nut 33 abutting against the upper surface of the second base 31. The extension length of each push rod 32 is adaptively adjusted according to the lower surface of the part. Among the multiple pad assemblies 3, some have a cylindrical second base 31, while others have an inverted T-shaped cross-section. The second base 31 is bolted to the base plate 1. The end of each push rod 32 is hemispherical.

[0046] The method for automating measurement and alignment of the torque arm part clamping device provided by this invention includes the following steps:

[0047] S1, clamp part 5 in the torque arm part clamping device, wherein the end face of the hole on part 5 is the machined surface 51.

[0048] S2. The clamped part is placed into the horizontal machining center. An initial measurement coordinate system is established, with the origin at B0. The probe measures 35mm in the Z-depth direction of the small hole on the part. The deflection angle is calculated using the actan function and accumulated in the B-axis coordinate. The horizontal machining center is configured with a 3+1 automatic origin calculation macro program. The B-axis alarm threshold does not exceed 0.5 degrees; otherwise, the probe may hit the hole wall, affecting the measurement results.

[0049] S3. Place the clamping device for the part at the origin B0 of the coordinate system, select a suitable X length, and measure two points around the hole. Choose measurement points near the part's tool insertion location whenever possible. During the calculation process, accumulate the theoretical height difference between the part's end faces into the end face value with the smaller Z value. Use the actan function to calculate the theoretical deflection value in the B0 direction and assign this value to the machine tool's common variables. The machine tool probe rod should use a carbon fiber rod with an effective diameter greater than or equal to 50mm.

[0050] S4, rotate the clamping device around the B-axis to 180°, keep the two points projected in step S3, measure the Z value of the two points, accumulate the theoretical height difference of the end face to the end face with the smaller Z value, use the actan function to calculate the theoretical deflection value in the B180 direction, add the deflection value in this step to the deflection value generated in step S3 of the machine tool and take the average value, and accumulate the average value to the main coordinate G54.

[0051] Steps S3 and S4 can be repeated once. That is, after calculating the new B0 in steps S3 and S4, steps S3 and S4 are run again with the new B0 value to eliminate the influence of probe contact point error on accuracy.

[0052] S5, reread the coordinate system, rotate the B axis to the new B0, measure the coordinates of the two holes on the lug of the part in the B0 state, calculate the center distance between the two holes, subtract the theoretical center distance from the measured center distance, divide by 2, add the difference to the origin X coordinate, and assign the Y coordinates of the two holes to the machine tool common variables.

[0053] The aforementioned common variables are those between #500 and #700 (Funnc system), meaning they are variables that will not be cleared after the program ends. The Y-value alarm threshold should be set within 0.3mm; a threshold that is too high will affect the wall thickness of the parts and cause them to exceed tolerances.

[0054] S6, measure the coordinates of the two holes on the reverse side, verify the center distance of the holes, and average the Y values ​​of the two holes in state B180 with the Y values ​​in state B0. Find the maximum and minimum Y values, and automatically determine whether the Y deviation exceeds the threshold or issue an alarm. The B180 value is rotated to the 180° position, and B0 is the initial 0° position.

[0055] S7. Rotate the device for clamping the part around axis B to 90 degrees, measure the actual length of the part's lug position, assign the value to the common variable, and record the position of the lug measurement point.

[0056] S8, rotate the device for clamping the part to 0 degrees, measure the measurement point in step S6, offset the Z value by half, and then update the value in the G54 coordinate system.

[0057] S9 detects the difference between the allowance of each end face of the part and the theoretical value. If the difference exceeds the preset threshold, an alarm is issued. Example

[0058] like Figure 1 As shown, the part is clamped off-line, ensuring that the deformation of the hole and end face does not exceed 0.03mm during the clamping process, before being put back into the line and machined using a horizontal machining center.

[0059] like Figure 4 As shown, Figure 4 Parts 4-1, 4-2, 4-3, 4-4, 4-5, 4-6, 4-7, 4-8, 4-9, 4-10, and 4-11 are all measuring rods. In state B0, the Z-value difference between two points before and after 4-9 is 35mm. The small hole in the part is roughly straightened, and the calculation is as follows:

[0060] N282 #3=#2-#1

[0061] N284 #4=ATAN[#3 / 30.]

[0062] N288 IF [#4 GT 0.2] GOTO 1111

[0063] N0300 M99

[0064] N1111 #3000=1 (Check hole B)

[0065] like Figure 4 As shown, the Z values ​​for 4-10 and 4-7 are measured in state B0, and the Z value for 4-4 is measured in state B180. The height difference of the part (42) is added to the measurement point for 4-10, and the height difference of the part (104) is added to 4-1. The program calculation is as follows:

[0066] front:

[0067] N252 #1=#1+42.

[0068] N254 #3=#2-#1

[0069] N284 #4=ATAN[#3 / 488.725]

[0070] N286 #744=#4

[0071] Reverse side:

[0072] N252 #2=#2+104.

[0073] N254 #3=#2-#1

[0074] N284 #4=ATAN[#3 / 488.725]

[0075] N286 #5=[#4+#744] / 2

[0076] N287 #5224=#5224-#5

[0077] N287 #5 = ABS[#5]

[0078] N288 IF [#5 GT 0.5] GOTO 1111

[0079] 0300 M99

[0080] N1111 #3000=1 (Check B)

[0081] Repeat the above steps once to eliminate errors caused by the probe contact point. An alarm will be triggered if the B-axis error exceeds 0.5 degrees.

[0082] Measure the actual thickness of the two lugs and assign the lug thickness to the machine tool's common variables. If the lug deformation exceeds 1mm, the machine tool will issue a Check192 alarm. The calculation part is as follows:

[0083] N292 #741=#2-#1

[0084] N294 #3 = ABS[192-#741]

[0085] N296 IF [#3 GT 1.] GOTO 1111

[0086] N0300 M99

[0087] N1111 #3000=1 (Check 192.)

[0088] Locate the XYZ origin of the part and verify the end face height difference again. The calculation part is as follows:

[0089] N612 #10=[#1+#2] / 2

[0090] N614 #11=[#3+#4] / 2

[0091] N616 #12=ABS[#10-#11-42.]

[0092] N618 #13=#741 / 2

[0093] N619 #13=#1-#13

[0094] N619 #5223=#5223+#13

[0095] N619 #13 = ABS[#13]

[0096] N619 #14=[#5+#7] / 2

[0097] N619 #14 = #14 + 203.698

[0098] N619 #5221=#5221+#14

[0099] N619 #14 = ABS[#14]

[0100] N619 #742=#6+#8

[0101] N619 IF [#12 GT 0.5] GOTO1111

[0102] N619 IF [#13 GT 0.5] GOTO2222

[0103] N619 IF [#14 GT 0.5] GOTO3333

[0104] N0620 M99

[0105] N1111 #3000=1 (Check 42.)

[0106] N2222 #3000=1(Check Z)

[0107] N3333 #3000=1(Check X)

[0108] The calculations for verifying the origin at B180 degrees are as follows:

[0109] N612 #10=[#1+#2] / 2

[0110] N614 #11=[#3+#4] / 2

[0111] N616 #12=ABS[#10-#11-104.]

[0112] N618 #7 = ABS[#7]

[0113] N619 #13=[#6+#8] / 2

[0114] N619 #14=#741 / 2

[0115] N621 #14 = ABS[#1-#14]

[0116] N619 IF[#12 GT 0.5] GOTO1111

[0117] N619 IF[#7 GT 0.7] GOTO2222

[0118] N619 IF[#14 GT 0.5] GOTO3333

[0119] N0620 M99

[0120] N1111 #3000=1(Check 104)

[0121] N2222 #3000=1 (Check FMX)

[0122] N3333 #3000=1 (Check FMZ)

[0123] To verify the origin of the coordinate system for the small hole on the reverse side, the calculation steps are as follows:

[0124] N232 #4=#1-407.395

[0125] N234 #5201=#4

[0126] N236 #4 = ABS[#4]

[0127] N237 #5 = ABS[#2]

[0128] N238 IF [#4 GT 0.05] GOTO 1111

[0129] N239 IF [#5 GT 0.05] GOTO 1111

[0130] N0240 M99

[0131] N1111 #3000=1 (Check FMX)

[0132] N2222 #3000=1(Check FMY).

[0133] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A torsion arm part clamping device comprising a base plate (1) having a length direction Z and a width direction X, characterized in that, It also includes a clamp (2) and a pad assembly (3) mounted on the substrate (1). The clamp (2) includes a first base (21), a pressure plate (23), and a pressure bar (22) with one end connected to the first base (21) and the other end connected to the pressure plate (23) for applying pressure to the pressure plate (23). There are two clamps (2) symmetrically arranged in the X direction, and an acute angle is formed between the two first bases (21). Multiple pad assemblies (3) are arranged between the two clamps (2), and the multiple pad assemblies (3) are arranged along the Z direction; each pad assembly (3) includes a second base (31) and at least one top rod (32) threaded to the upper end of the second base (31); the first base (21) and the second base (31) are mounted on the base plate (1); each clamp (2) also includes a support rod (25) threaded to one end of the pressure plate (23), and the support rod (25) is vertical. The support rod (25) is configured such that its bottom abuts against the first base (21); the support rod (25) includes a threaded section (251) and an optical axis section (252) connected in sequence; the threaded section (251) is threadedly connected to the pressure plate (23); a first nut (27) is installed on the threaded section (251); the first nut (27) abuts against the lower surface of the pressure plate (23); and the end of the optical axis section (252) away from the threaded section (251) abuts against the first base (21). The pressure rod (22) is a screw rod. The upper end of the pressure rod (22) extends to the top outside of the pressure plate (23). A first nut (27) and a second nut (28) are installed on the pressure rod (22). The first nut (27) abuts against the upper surface of the first base (21), and the second nut (28) abuts against the upper surface of the pressure plate (23). The first base (21) is also connected to a horizontally retractable abutment rod (26).

2. The torsion arm part holding device according to claim 1, characterized by A pressure head (24) is provided on the lower surface of one end of the pressure plate (23) on the two clamps (2) that are close to each other.

3. The torsion arm part holding device according to claim 1, characterized by The top rod (32) is a screw rod, and a third nut (33) is connected to the top rod (32). The third nut (33) abuts against the upper surface of the second base (31).

4. The torsion arm part clamping device according to any one of claims 1 to 3, characterized in that The second base (31) is cylindrical or has an inverted T-shaped cross-section.

5. The torsion arm part clamping device according to any one of claims 1 to 3, characterized in that There are two top rods (32) connected to the second base (31).

6. A method of measuring and aligning a torsion arm part clamping device, characterized by, include: Step 1: Clamp the part in the torque arm part clamping device as described in any one of claims 1-5, and then put the clamping device into the horizontal machining center; Step 2: Establish an initial measurement coordinate system, measure the Z-depth direction of the small end hole of the part, calculate the deflection angle, and accumulate the deflection angle into the B-axis coordinate. Step 3: Place the clamping device at the origin B0 of the coordinate system and measure two points around the hole of the part; accumulate the theoretical value of the height difference of the end face of the part into the end face value with the smaller Z value, calculate the theoretical deflection value in the B0 direction, and assign this value to the machine tool common variable; Step 4: Rotate the clamping device around the B-axis to 180°, measure the Z-values ​​of the two points in Step 3, add the theoretical height difference of the end face of the part to the end face with the smaller Z-value, calculate the deflection value, add the deflection value to the deflection value in Step S3, and take the average value. Add the average value to the coordinate system. Step 5: Reread the coordinate system, rotate the B-axis to the new B0 position, measure the coordinates of the two holes on the lug of the part in the B0 state, calculate the center distance between the two holes, subtract the measured center distance from the theoretical center distance and divide by 2, add the difference to the origin coordinates, and then assign the coordinates to the airport common variables. Step 6: Measure the coordinates of the two holes on the reverse side of the part's lug, verify the center distance of the holes, average the Y values ​​of the two holes in state B180 with the Y values ​​in state B0, find the minimum and maximum values ​​in the Y direction, and determine whether the Y deviation exceeds the threshold. If it does, issue an alarm. Step 7: Rotate the clamping device around axis B to 90°, measure the actual length of the lug position of the part, assign the value to the common variable, and record the position of the lug measurement point; Step 8: Rotate the clamping device around the B-axis to 0°, measure the measurement point from Step 6, offset the Z value by half, and then update the value in the coordinate system. Step 9: Detect the difference between the allowance of each end face of the part and the theoretical value. If it exceeds the preset threshold, an alarm will be issued.

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