Machining and positioning device for triangular arm type parts

Abstract

The utility model provides a triangular arm part machining and positioning device which comprises a triangular arm part 1, a three-jaw chuck 2, a centering device 3, a conical center 4, a screw 5, a sliding type cylindrical positioning pin 6, an auxiliary supporting pin 7, an adjustable cushion block 8 and a machine tool movable center 9. Wherein the triangular arm part 1 is provided with a center hole 1-1, an auxiliary positioning surface 1-2, an auxiliary supporting surface 1-3, a precision shaft 1-4, a threaded shaft 1-5 and a center hole 1-6; the center hole 1-1 and the center hole 1-6 are formed in the two ends of the triangular arm part 1; the centering device 3 is in a stepped cylinder shape, a stepped kidney-shaped through hole groove 3-1 and a precision hole 3-3 are formed in a semicircular area on one side of the centering device 3, a precision hole 3-2 is formed in the center of the centering device 3, and a stepped circle 3-4 is arranged on the edge of the centering device 3. A threaded rod 5 is arranged on the step kidney-shaped through hole groove 3-1, a conical surface tip 4 is arranged on the precision hole 3-2 through a temperature difference assembly method, and an auxiliary supporting pin 7 is arranged on the precision hole 3-3 of the centering device 3 through the temperature difference assembly method.

Description

Technical Field

[0001] This invention belongs to the field of machining and relates to a machining positioning device for triangular arm-type parts. Background Technology

[0002] The delta arm is a complex and critical component in helicopters. Its overall structure consists of a triangular prism with a cylinder at the top, and the cylinder end has a high-precision smooth rod and threads. When machining the threads and smooth rod, a combination fixture is needed to fix the left end of the triangular prism on the lathe. Repeated adjustments and trial cuts are required, but the excessive time spent on clamping, alignment, and trial cutting before machining prolongs the product processing cycle, severely impacting production efficiency. Even worse, the instability of the combination fixture leads to inconsistent installation accuracy each time, easily causing the part's dimensions and geometric tolerances (roundness, perpendicularity, symmetry) to exceed tolerances or even result in scrapping. Summary of the Invention

[0003] This application provides a machining positioning device for triangular arm-type parts, which can solve the problems of parts having excessive external dimensions and geometric tolerances, or even being scrapped.

[0004] Technical Solution: A machining and positioning device for triangular arm-type parts, comprising: 1. Triangular arm-type part; 2. Three-jaw chuck; 3. Centering device; 4. Conical center; 5. Screw; 6. Sliding cylindrical positioning pin; 7. Auxiliary support pin; 8. Adjustable pad; and 9. Machine tool movable center, wherein:

[0005] The triangular arm type part 1 is provided with a first center hole 1-1, an auxiliary positioning surface 1-2, an auxiliary support surface 1-3, a precision shaft 1-4, a first threaded shaft 1-5, and a second center hole 1-6; the first center hole 1-1 and the second center hole 1-6 are located at both ends of the triangular arm type part 1.

[0006] The centering device 3 is a stepped cylindrical shape. A stepped waist-shaped through hole groove 3-1 and a second precision hole 3-3 are provided in the semi-circular area on one side of the centering device 3. A first precision hole 3-2 is provided at the center of the centering device 3. A stepped circle 3-4 is provided at the edge of the centering device 3. A screw 5 is installed on the stepped waist-shaped through hole groove 3-1. A conical tip 4 is installed on the first precision hole 3-2 by means of temperature difference assembly. An auxiliary support pin 7 is installed on the second precision hole 3-3 of the centering device 3 by means of temperature difference assembly. The stepped circle 3-4 is used to stabilize it on the three-jaw chuck 2, so as to clamp the centering device 3 and fix it on the machine tool worktable.

[0007] The conical tip 4 has a tip-shaped structure, and is provided with a first positioning shaft 4-2 and a tip 4-1; the screw 5 has a rod-shaped structure, and is provided with a rectangular base 5-2 and a second threaded shaft 5-1; the sliding cylindrical positioning pin 6 has a cylindrical structure, and is provided with a hexagonal through hole 6-1, a threaded through hole 6-2, and an outer cylindrical positioning surface 6-3; the auxiliary support pin 7 has a stepped cylindrical rod-shaped structure, and is provided with a second positioning shaft 7-1 at one end and a mating shaft 7-2 at the other end; the adjustable pad 8 has a U-shaped structure, and ... The U-shaped outer side of the adjustable pad 8 is provided with a support surface 8-1 and the inner side is provided with a mating groove 8-2; the mating groove 8-2 of the adjustable pad 8 is in contact with the second positioning shaft 7-1 of the auxiliary support pin 7; the support surface 8-1 of the adjustable pad 8 is in contact with the auxiliary support surface 1-3 on the other side of the triangular arm-like part 1 to perform a second auxiliary positioning of the triangular arm-like part 1; the machine tool movable center 9 is set on the machine tool, and the center 4-1 of the conical center 4 and the machine tool movable center 9 are used to clamp the triangular arm-like part 1 to perform a first positioning of the triangular arm-like part 1.

[0008] Furthermore, a screw 5 is installed on the stepped waist-shaped through-hole groove 3-1 of the centering device 3; the relative position of the screw 5 is adjusted according to the width of the part, and the second threaded shaft 5-1 of the screw 5 is engaged with the threaded through-hole 6-2 of the sliding cylindrical positioning pin 6 and tightened with a hex wrench to achieve the fit between the outer circle positioning surface 6-3 of the sliding cylindrical positioning pin 6 and the auxiliary positioning surface 1-2 on one side of the triangular arm-like part 1, so as to perform the second auxiliary positioning of the triangular arm-like part 1.

[0009] Furthermore, the center line of the waist-shaped through-hole groove of the centering device 3 passes through the center of the centering device 3.

[0010] Furthermore, the distance between the support surface (8-1) of the adjustable pad (8) and the mating groove (8-2) is calculated by BCA, where: A is the distance from the auxiliary support surface (1-3) of the triangular arm-like part (1) that it is in contact with to the center of the first top hole (1-1); B is the distance from the center of the auxiliary support pin (7) to the center of the first top hole (1-1); and C is the radius of the second positioning shaft (7-1) of the auxiliary support pin (7).

[0011] Furthermore, the stepped waist-shaped through-hole groove 3-1 of the centering device 3 cooperates with the rectangular base 5-2 of the screw 5 to adjust the position of the screw 5 according to the size of the triangular arm-like part 1; the first precision hole 3-2 of the centering device 3 cooperates with the first positioning shaft 4-2 of the conical tip 4, and the second precision hole 3-3 of the centering device 3 cooperates with the auxiliary support pin 7 and the shaft 7-2 to achieve the second positioning of the triangular arm-like part 1.

[0012] Furthermore, the sliding cylindrical positioning pin 6 has a threaded through hole 6-2 that mates with the second threaded shaft 5-1 of the screw 5, and the outer cylindrical positioning surface 6-3 of the sliding cylindrical positioning pin 6 is in contact with the auxiliary positioning surface 1-2 of the triangular arm-like part 1, thereby enabling the part to rotate along with the machine spindle.

[0013] Furthermore, the first center hole 1-1 of the triangular arm-type part 1 mates with the center 4-1 of the conical center 4, the auxiliary positioning surface 1-2 on one side of the triangular arm-type part 1 is in contact with the outer circle positioning surface 6-3 of the sliding cylindrical positioning pin 6, the auxiliary support surface 1-3 on the other side of the triangular arm-type part 1 is in contact with the support surface 8-1 of the adjustable pad 8, and the movable center 9 of the machine tool mates with the second center hole 1-6 of the triangular arm-type part 1 to achieve the clamping of the triangular arm-type part 1.

[0014] Furthermore, the assembly process of centering device 3, conical tip 4, screw 5, sliding cylindrical positioning pin 6, and auxiliary support pin 7 is as follows: the first positioning shaft 4-2 of conical tip 4 is fitted with the first precision hole 3-2 of centering device 3 using the temperature difference assembly method; the auxiliary support pin 7 is fitted with shaft 7-2 and the second precision hole 3-3 of centering device 3 using the temperature difference assembly method; a screw (5) is installed on the stepped waist-shaped through hole groove (3-1) of centering device (3); the relative position of screw (5) is adjusted according to the width of triangular arm type parts to ensure that the outer circle positioning surface (6-3) of sliding cylindrical positioning pin (6) and the far end of the auxiliary positioning surface (1-2) on one side of triangular arm type parts (1) are in contact; the second threaded shaft (5-1) of screw (5) is fitted with the threaded through hole (6-2) of sliding cylindrical positioning pin (6); and tightened with a hex wrench.

[0015] This application provides a machining positioning device for triangular arm-type parts. By using the pre-drilled center holes at both ends of the part in the CNC milling semi-finishing process, the newly made machining positioning device can be used to accurately machine the precision shaft and thread shaft during turning. The novel process method of this new machining positioning device achieves simple, quick, and efficient installation and disassembly. Using this machining positioning device improves product quality and production efficiency, and shortens the processing period. Attached Figure Description

[0016] Figure 1 A clamping diagram of a machining positioning device for a triangular arm type part 1 provided in this application;

[0017] Figure 2 This is a partial schematic diagram of a processing positioning device provided in this application;

[0018] Figure 3 This is a schematic diagram of the structure of a centering device 3 provided in this application;

[0019] Figure 4This application provides a schematic diagram of the structure of a conical tip 4;

[0020] Figure 5 This application provides a schematic diagram of the structure of a screw 5;

[0021] Figure 6 A schematic diagram of the structure of a sliding cylindrical positioning pin 6 provided in this application;

[0022] Figure 7 A schematic diagram of the structure of an auxiliary support pin 7 provided in this application;

[0023] Figure 8 A schematic diagram of the structure of an adjustable pad 8 provided in this application;

[0024] Figure 9 This is a structural schematic diagram of the triangular arm-type part 1 provided in this application;

[0025] The components include: 1. Triangular arm type parts; 2. Three-jaw chuck; 3. Centering device; 4. Conical center; 5. Screw; 6. Sliding cylindrical positioning pin; 7. Auxiliary support pin; 8. Adjustable pad; and 9. Machine tool movable center; 1-1. First center hole; 1-2. Auxiliary positioning surface; 1-3. Auxiliary support surface; 1-4. Precision shaft; 1-5. First threaded shaft; 1-6. Second center hole; 3-1. Stepped waist-shaped through hole groove; 3-2. First precision hole; 3-3. Second precision hole; 3-4. Stepped circle; 4-2. First positioning shaft; 4-1. Center; 5-2. Rectangular base; 5-1. Second threaded shaft; 6-1. Hexagonal through hole; 6-2. Threaded through hole; 6-3. Outer circle positioning surface; 7-1. Second positioning shaft; 7-2. Mating shaft; 8-1. Support surface; 8-2. Mating groove. Detailed Implementation

[0026] Example 1

[0027] like Figure 1 As shown, this utility model provides a machining positioning device for triangular arm-type parts, including a triangular arm-type part 1, a three-jaw chuck 2, a centering device 3, a conical center 4, a screw 5, a sliding cylindrical positioning pin 6, an auxiliary support pin 7, an adjustable pad 8, and a machine tool movable center 9, wherein:

[0028] The triangular arm type part 1 is provided with a first center hole 1-1, an auxiliary positioning surface 1-2, an auxiliary support surface 1-3, a precision shaft 1-4, a first threaded shaft 1-5, and a second center hole 1-6; the first center hole 1-1 and the second center hole 1-6 are located at both ends of the triangular arm type part 1.

[0029] The three-jaw chuck 2 is used to clamp the stepped circle 3-4 of the centering device 3, thereby fixing the centering device 3 on the machine tool workbench.

[0030] The centering device 3 is a stepped cylindrical shape. A stepped waist-shaped through-hole groove 3-1 and a second precision hole 3-3 are provided in the semi-circular area on one side of the centering device 3. A first precision hole 3-2 is provided at the center of the centering device 3. A stepped circle 3-4 is provided on the outer cylindrical surface of the centering device 3. A screw 5 is installed on the stepped waist-shaped through-hole groove 3-1. A conical tip 4 is installed on the first precision hole 3-2 by temperature difference assembly. An auxiliary support pin 7 is installed on the second precision hole 3-3 of the centering device 3 by temperature difference assembly. The stepped circle 3-4 is used to stabilize it on the three-jaw chuck 2.

[0031] The conical tip 4 has a tip-shaped structure and is equipped with a first positioning shaft 4-2 and a tip 4-1; the screw 5 has a rod-shaped structure and is equipped with a rectangular base 5-2 and a second threaded shaft 5-1; the sliding cylindrical positioning pin 6 has a cylindrical structure and is equipped with a hexagonal through hole 6-1, a threaded through hole 6-2, and an outer cylindrical positioning surface 6-3; the auxiliary support pin 7 has a stepped cylindrical rod-shaped structure, with a second positioning shaft 7-1 at one end and a mating shaft 7-2 at the other end; the adjustable pad 8 has a U-shaped structure. The U-shaped outer side of the pad 8 is provided with a support surface 8-1 and the inner side is provided with a mating groove 8-2; the mating groove 8-2 of the adjustable pad 8 is in contact with the second positioning shaft 7-1 of the auxiliary support pin 7; the support surface 8-1 of the adjustable pad 8 is in contact with the auxiliary support surface 1-3 on the other side of the triangular arm-like part 1 to perform a second auxiliary positioning of the triangular arm-like part 1; the machine tool movable center 9 is set on the machine tool, and the center 4-1 of the conical center 4 and the machine tool movable center 9 are used to clamp the triangular arm-like part 1 to perform a first positioning of the triangular arm-like part 1.

[0032] Specifically, a screw 5 is installed on the stepped waist-shaped through-hole groove 3-1 of the centering device 3; the relative position of the screw 5 is adjusted according to the width of the part; the second threaded shaft 5-1 of the screw 5 is engaged with the threaded through-hole 6-2 of the sliding cylindrical positioning pin 6 and tightened with a hex wrench to achieve the fit between the outer circle positioning surface 6-3 of the sliding cylindrical positioning pin 6 and the auxiliary positioning surface 1-2 on one side of the triangular arm-like part 1, thereby performing the second auxiliary positioning of the triangular arm-like part 1.

[0033] Specifically, such as Figure 3 As shown, the center line of the waist-shaped through-hole groove of the centering device 3 passes through the center of the centering device 3.

[0034] Specifically, the distance between the support surface (8-1) of the adjustable pad (8) and the mating groove (8-2) is equal to: the distance from the center of the auxiliary support pin (7) to the center of the first top hole (1-1), minus "the distance from the auxiliary support surface (1-3) of the triangular arm-like part (1) that it fits to to the center of the first top hole (1-1)," and then minus "the radius of the second positioning shaft (7-1) of the auxiliary support pin (7)."

[0035] Specifically, the centering device 3 has a stepped waist-shaped through-hole groove 3-1 that cooperates with the rectangular base 5-2 of the screw 5, and the position of the screw 5 is adjusted according to the size of the triangular arm-type part 1; the first precision hole 3-2 of the centering device 3 cooperates with the first positioning shaft 4-2 of the conical tip 4, and the second precision hole 3-3 of the centering device 3 cooperates with the auxiliary support pin 7 and the shaft 7-2, so as to realize the second positioning and clamping of the triangular arm-type part 1.

[0036] Specifically, the sliding cylindrical positioning pin 6 has a threaded through hole 6-2 that mates with the second threaded shaft 5-1 of the screw 5, and the outer cylindrical positioning surface 6-3 of the sliding cylindrical positioning pin 6 is in contact with the auxiliary positioning surface 1-2 of the triangular arm-like part 1, thereby enabling the part to rotate along with the machine spindle.

[0037] Specifically, the first center hole 1-1 of the triangular arm-type part 1 mates with the center 4-1 of the conical center 4, the auxiliary positioning surface 1-2 on one side of the triangular arm-type part 1 is in contact with the outer circle positioning surface 6-3 of the sliding cylindrical positioning pin 6, the auxiliary support surface 1-3 on the other side of the triangular arm-type part 1 is in contact with the support surface 8-1 of the adjustable pad 8, and the movable center 9 of the machine tool mates with the second center hole 1-6 of the triangular arm-type part 1 to achieve the clamping of the triangular arm-type part 1.

[0038] Specifically, such as Figure 2 As shown, the utility model provides a centering device 3, a conical tip 4, a screw 5, a sliding cylindrical positioning pin 6, and an auxiliary support pin 7 for a triangular arm-like part. The assembly process is as follows: the first positioning shaft 4-2 of the conical tip 4 is fitted with the first precision hole 3-2 of the centering device 3 using a temperature difference assembly method; the auxiliary support pin 7 is fitted with shaft 7-2 and the second precision hole 3-3 of the centering device 3 using a temperature difference assembly method; the screw 5 is installed on the stepped waist-shaped through hole groove 3-1 of the centering device 3; the relative position of the screw 5 is adjusted according to the width dimension of the triangular arm-like part 1 to ensure that the outer circle positioning surface 6-3 of the sliding cylindrical positioning pin 6 and the far end of one side auxiliary positioning surface 1-2 of the triangular arm-like part 1 are in contact; the second threaded shaft 5-1 of the screw 5 is fitted with the threaded through hole 6-2 of the sliding cylindrical positioning pin 6; and it is tightened with a hex wrench.

[0039] Example 2

[0040] The present invention provides a machining positioning device for triangular arm-type parts, the usage process of which is as follows:

[0041] Step 1: Drill the first center hole 1-1 and the second center hole 1-6 at both ends of the triangular arm type part 1;

[0042] Step 2: After completing the partial assembly of the positioning device, mount the assembled partial body of the machining positioning device onto the three-jaw chuck 2;

[0043] Step 3: Connect the center hole 1-1 of the triangular arm part 1 to the cone tip 4 tip 4-1, and make the auxiliary positioning surface 1-2 on one side of the triangular arm part 1 fit with the outer circle positioning surface 6-3 of the sliding cylindrical positioning pin 6. Make the auxiliary support surface 1-3 on the other side of the triangular arm part 1 fit with the support surface 8-1 of the adjustable pad 8.

[0044] Step 4: Clamp the center hole 1-6 of the triangular arm type part 1 with the moving center 9 of the machine tool;

[0045] Step 5: Triangular arm type part 1 enters the machinable state, that is, the precision shaft 1-4 and the first thread shaft 1-5 of the part can be machined;

[0046] Step 6: Loosen the moving center 9 of the machine tool and disassemble the parts.

[0047] In summary, this application provides a machining positioning device for triangular arm-type parts. By using the pre-drilled center holes at both ends of the part during the CNC milling semi-finishing process, this newly manufactured machining positioning device can accurately machine the precision shaft and threaded shaft during turning. The novel process method of this newly manufactured machining positioning device achieves simple, quick, and efficient installation and disassembly. Using this machining positioning device improves product quality and production efficiency, and shortens the processing period.

Claims

1. A machining and positioning device for triangular arm-type parts, characterized in that, Triangular arm type parts (1), three-jaw chuck (2), centering device (3), conical center (4), screw (5), sliding cylindrical positioning pin (6), auxiliary support pin (7), adjustable pad (8), and machine tool movable center (9), among which: The triangular arm type part (1) is provided with a first center hole (1-1), an auxiliary positioning surface (1-2), an auxiliary support surface (1-3), a precision shaft (1-4), a first threaded shaft (1-5), and a second center hole (1-6); the first center hole (1-1) and the second center hole (1-6) are located at both ends of the triangular arm type part (1); The centering device (3) is a stepped cylindrical shape. A stepped waist-shaped through hole groove (3-1) and a second precision hole (3-3) are provided in the semi-circular area on one side of the centering device (3). A first precision hole (3-2) is provided at the center of the centering device (3). A stepped circle (3-4) is provided at the edge of the centering device (3). A screw (5) is installed on the stepped waist-shaped through hole groove (3-1). A conical tip (4) is installed on the first precision hole (3-2) by means of temperature difference assembly. An auxiliary support pin (7) is installed on the second precision hole (3-3) of the centering device (3) by means of temperature difference assembly. The stepped circle (3-4) is used to stabilize it on the three-jaw chuck (2) to realize the clamping of the centering device (3) on the machine tool worktable. The conical tip (4) is a tip-shaped structure, and the conical tip (4) is provided with a first positioning shaft (4-2) and a tip (4-1); the screw (5) is a rod-shaped structure, and is provided with a rectangular base (5-2) and a second threaded shaft (5-1); the sliding cylindrical positioning pin (6) is a cylindrical structure, and is provided with a hexagonal through hole (6-1), a threaded through hole (6-2) and an outer cylindrical positioning surface (6-3); the auxiliary support pin (7) is a stepped cylindrical rod-shaped structure, and is provided with a second positioning shaft (7-1) at one end and a mating shaft (7-2) at the other end; the adjustable pad (8) is a U-shaped structure, and the adjustable pad is provided with a U-shaped structure; the adjustable pad is provided with a hexagonal through hole (6-1), a threaded through hole (6-2) and an outer cylindrical positioning surface (6-3) at the other end; the auxiliary support pin (7) is a stepped cylindrical rod-shaped structure, and is provided with a second positioning shaft (7-1) at one end and a mating shaft (7-2) at the other end; the adjustable pad (8) is a U-shaped structure, and is provided with a hexagonal through hole (6-1), a threaded through hole (6-2) and an outer cylindrical positioning surface (6-3) at the other end; the adjustable pad (8) is a U-shaped structure, and is provided with a hexagonal through hole (6-2) and a threaded through hole (6-2) at the other end; the adjustable pad (8) is a U-shaped structure, and is provided with a hexagonal through hole (6-1 ... The U-shaped outer side of the pad (8) is provided with a support surface (8-1) and the inner side is provided with a mating groove (8-2); the mating groove (8-2) of the adjustable pad (8) is in contact with the second positioning shaft (7-1) of the auxiliary support pin (7); the support surface (8-1) of the adjustable pad (8) is in contact with the auxiliary support surface (1-3) on the other side of the triangular arm part (1) to perform the second auxiliary positioning of the triangular arm part (1); the machine tool movable center (9) is set on the machine tool, and the center (4-1) of the conical center (4) and the machine tool movable center (9) are used to clamp the triangular arm part (1) to perform the first positioning of the triangular arm part (1).

2. The processing positioning device according to claim 1, characterized in that, A screw (5) is installed on the stepped waist-shaped through hole groove (3-1) of the centering device (3); the relative position of the screw (5) is adjusted according to the width of the part. The second threaded shaft (5-1) of the screw (5) is engaged with the threaded through hole (6-2) of the sliding cylindrical positioning pin (6) and tightened with a hex wrench to achieve the fit between the outer circle positioning surface (6-3) of the sliding cylindrical positioning pin (6) and the auxiliary positioning surface (1-2) on one side of the triangular arm part (1) for the second auxiliary positioning of the triangular arm part (1).

3. The processing positioning device according to claim 1, characterized in that, The center line of the waist-shaped through-hole groove of the centering device (3) passes through the center of the centering device (3).

4. The processing positioning device according to claim 1, characterized in that, The distance between the support surface (8-1) of the adjustable pad (8) and the mating groove (8-2) is calculated by BCA, where: A is the distance from the auxiliary support surface (1-3) of the triangular arm-like part (1) that it is in contact with to the center of the first top hole (1-1); B is the distance from the center of the auxiliary support pin (7) to the center of the first top hole (1-1); and C is the radius of the second positioning shaft (7-1) of the auxiliary support pin (7).

5. The processing positioning device according to claim 1, characterized in that, The centering device (3) has a stepped waist-shaped through-hole groove (3-1) that cooperates with the rectangular base (5-2) of the screw (5) to adjust the position of the screw (5) according to the size of the triangular arm type part (1); the centering device (3) has a first precision hole (3-2) that cooperates with the first positioning shaft (4-2) of the conical tip (4); the centering device (3) has a second precision hole (3-3) that cooperates with the auxiliary support pin (7) and shaft (7-2) to achieve auxiliary support for the triangular arm type part (1).

6. The processing positioning device according to claim 1, characterized in that, The sliding cylindrical positioning pin (6) threaded through hole (6-2) is engaged with the second threaded shaft (5-1) of the screw (5), and the outer cylindrical positioning surface (6-3) of the sliding cylindrical positioning pin (6) is in contact with the auxiliary positioning surface (1-2) of the triangular arm type part (1) to realize the random rotation of the part by the machine spindle.

7. The processing positioning device according to claim 1, characterized in that, The first center hole (1-1) of the triangular arm type part (1) is engaged with the center (4-1) of the conical center (4), the auxiliary positioning surface (1-2) on one side of the triangular arm type part (1) is in contact with the outer circle positioning surface (6-3) of the sliding cylindrical positioning pin (6), the auxiliary support surface (1-3) on the other side of the triangular arm type part (1) is in contact with the support surface (8-1) of the adjustable pad (8), and the movable center (9) of the machine tool is engaged with the second center hole (1-6) of the triangular arm type part (1) to achieve the clamping of the triangular arm type part (1).

8. The processing positioning device according to claim 1, characterized in that, The assembly process of the centering device (3), the conical tip (4), the screw (5), the sliding cylindrical positioning pin (6), and the auxiliary support pin (7) is as follows: the first positioning shaft (4-2) of the conical tip (4) is matched with the first precision hole (3-2) of the centering device (3) using the temperature difference assembly method; the auxiliary support pin (7) is matched with the shaft (7-2) of the centering device (3) using the temperature difference assembly method; the screw (5) is installed on the stepped waist-shaped through hole groove (3-1) of the centering device (3); the relative position of the screw (5) is adjusted according to the width of the triangular arm type part to ensure that the outer circle positioning surface (6-3) of the sliding cylindrical positioning pin (6) and the far end of the auxiliary positioning surface (1-2) on one side of the triangular arm type part (1) are in contact; the second threaded shaft (5-1) of the screw (5) is matched with the threaded through hole (6-2) of the sliding cylindrical positioning pin (6); and tightened with a hex wrench.

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