A machining method of a multi-axis angular special-shaped positioning pin

Abstract

This invention provides a multi-axis angled irregular-shaped locating pin, comprising a locating block and a locating pin integrally connected to the locating block; the locating block is connected to a moving blade, and the locating pin is connected to a rotor hub; the axis of the locating block and the axis of the locating pin intersect at the rotation center axis of the moving blade; the angle between the axis of the locating block and the axis of the locating pin is 0≤γ≤4. This invention also provides a method for machining the multi-axis angled irregular-shaped locating pin. The multi-axis angled irregular-shaped locating pin provided by this invention can precisely adjust the angle of the moving blade, and the machining method for the multi-axis angled irregular-shaped locating pin provided by this invention has high machining accuracy and high efficiency.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and in particular to a machining method for multi-axis angular irregularly shaped locating pins. Background Technology

[0002] The large-scale wind tunnel centrifugal compressor prototype simulates aerodynamic parameters under different operating conditions by adjusting the angle of the moving blades. Different operating conditions require precise adjustment of the moving blades to different angles. Therefore, a special-shaped angle locating pin is needed to achieve precise adjustment and positioning of the moving blade angle.

[0003] Irregular angle locating pins differ from conventional locating pins. They are locating pins with multiple axis lines and angles between them. Irregular angle locating pins are small in size, numerous in assembly, and produced in multiple batches. Since this type of locating pin has never been used before, and there is no experience in manufacturing it, the processing and manufacturing of these multi-axis, angled irregular locating pins has become a crucial factor restricting the structural design of the large wind tunnel centrifugal compressor simulation test device and even its subsequent successful test operation.

[0004] Therefore, how to efficiently and accurately process multi-axis angular irregularly shaped positioning pins is an urgent problem to be studied and solved in the field of large wind tunnel centrifugal compressor processing. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a multi-axis angled irregular locating pin with high precision and high processing efficiency and a processing method thereof.

[0006] To solve the above-mentioned technical problems, the present invention provides a multi-axis angled irregular-shaped positioning pin, which connects the moving blade and the rotor hub of a wind tunnel compressor test prototype, and is used to adjust the angle of the moving blade. The positioning pin includes...

[0007] Positioning block and positioning pin integrally connected to the positioning block;

[0008] The positioning block is connected to the moving blade, and the positioning pin is connected to the rotor hub;

[0009] The centerline of the positioning block and the centerline of the positioning pin intersect at the rotation center axis of the moving blade;

[0010] The angle between the centerline of the positioning block and the centerline of the positioning pin is 0 ≤ γ ≤ 4.

[0011] Furthermore, the positioning block has a rectangular structure, the positioning pin has a cylindrical structure, and the positioning pin and the positioning block are an integral structure.

[0012] Furthermore, the upper and lower planes of the positioning block are connected to the positioning groove on the root of the moving blade to position the angle of the moving blade, and the outer circle of the positioning pin is connected to the positioning pin hole of the hub to position the moving blade and the hub.

[0013] The present invention also provides a method for machining multi-axis angled irregular locating pins, comprising the following steps:

[0014] Forging involves blanks with multiple locating pin lengths;

[0015] Heat treatment of forged billets;

[0016] Rough machining of the heat-treated billet;

[0017] The rough-machined blank is cut into sections to obtain dimensions that satisfy L1 = L + 10 mm.

[0018] Multiple locating pin blanks are required;

[0019] A positioning block with length, width, and height of H, W, and a is machined at one end of the positioning pin blank;

[0020] The positioning block of the positioning pin blank is clamped onto the machine tool using a special fixture;

[0021] A positioning pin body with an axial length of b, a diameter of d, and an angle of γ between its central axis and the central axis of the positioning block is machined at the other end of the positioning pin blank.

[0022] Where L1 is the axial length of the locating pin blank after cutting, and L is the axial length of the multi-axis angled irregular locating pin after processing.

[0023] Furthermore, the special fixture includes a clamping body, a pressure plate, and a sliding plate. The clamping body includes a cylindrical connecting body and a mounting plate. The mounting plate is integrally and vertically connected to one end of the connecting body, and the axis of the mounting plate coincides with the axis of the connecting body.

[0024] Furthermore, a keyway is provided at the axial center position of the end of the mounting plate. The keyway is matched in size with the positioning block of the positioning pin blank, and the angle between the axis of the keyway and the axis of the mounting plate is γ. The positioning block of the positioning pin blank is installed in the keyway and fixed by pressure plates and slide plates connected to the upper and lower sides of the mounting plate.

[0025] Furthermore, the positioning block of the positioning pin blank is fixed in the keyway, and the special fixture is clamped on the chuck of the horizontal lathe through the connecting body of the fixture body, and then aligned by dial indicator using the outer circle and end face of the connecting body.

[0026] Furthermore, after the special fixture is aligned using a dial indicator, the positioning pin body is machined at the other end of the positioning pin blank by turning. The centerline of the machined positioning pin body forms an angle γ with the centerline of the positioning block body, and coincides with the centerline of the fixture body connecting body and the mounting plate.

[0027] Furthermore, the cutting speed of the locating pin body during turning is 200-250 m / min, the feed rate is 0.1-0.2 mm / r, and the depth of cut is 0.1-0.4 mm.

[0028] Furthermore, the multi-axis angled irregular positioning pin includes various multi-axis angled irregular positioning pins with an angle γ of 0°, 1° or 4° between the centerline of the positioning pin body and the centerline of the positioning block body, and the special fixture includes various special fixtures with an angle γ of 0°, 1° or 4° between the centerline of the keyway and the centerline of the mounting plate.

[0029] This invention provides a multi-axis angled irregular-shaped positioning pin, which connects the moving blades of a wind tunnel compressor prototype to the rotor hub for adjusting the angle of the moving blades. The positioning pin consists of a positioning block that connects to the moving blades and a positioning pin that connects to the rotor hub. To precisely adjust the moving blades to different angles under different operating conditions, the centerlines of the positioning block and the positioning pin are at a certain angle, and these two centerlines intersect at the rotation center axis of the moving blades. Because the centerlines of the positioning block and the positioning pin can be designed to be at different angles, this multi-axis angled irregular-shaped positioning pin allows for precise adjustment of the moving blades of a large wind tunnel centrifugal compressor simulator to a predetermined angle, achieving the simulated operation requirements of aerodynamic parameters under different operating conditions.

[0030] Furthermore, the present invention provides a machining method for multi-axis angled irregular locating pins. Utilizing the multi-axis characteristics of the workpiece, the locating block and the locating pin are machined as two separate parts. First, the locating block is machined. Then, a special fixture is used to clamp the locating block while the locating pin is machined. Since the mounting plate of the special fixture has a keyway at its axial center that matches the size of the locating block, and the angle between the keyway and the axis of the mounting plate is equal to the angle between the axis of the locating block and the locating pin, the locating block is fixed within the keyway. The locating pin is then machined at the other end of the locating pin blank using a turning method. The axis of the machined locating pin coincides with the axis of the fixture body and the mounting plate. Thus, the angle between the axis of the locating pin and the axis of the locating block reaches a predetermined angle, thereby achieving precise machining of multi-axis angled irregular locating pins. The processing method of the multi-axis angled irregular positioning pin of the present invention is not only simple to process, but also, by designing the keyway axis on the special fixture to have a different angle from the axis of the mounting plate, it is possible to process a multi-axis angled irregular positioning pin with the expected angle between the axis of the positioning block and the axis of the positioning pin. Attached Figure Description

[0031] Figure 1 A schematic diagram showing the position of the multi-axis angled irregularly shaped locating pin in the rotor, provided in an embodiment of the present invention;

[0032] Figure 2 A top view from direction A showing the position of the multi-axis angled irregularly shaped locating pin in the rotor according to an embodiment of the present invention;

[0033] Figure 3 This is a front view of a multi-axis angled irregularly shaped locating pin provided in an embodiment of the present invention;

[0034] Figure 4 A top view of a multi-axis angled irregularly shaped locating pin provided in an embodiment of the present invention;

[0035] Figure 5 A schematic diagram of the forging blank structure processed by the multi-axis angled irregular locating pin machining method provided in an embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of the forging blank structure after rough machining of the multi-axis angled irregular positioning pin machining method provided in the embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the structure of the positioning pin blank in the multi-axis angled irregular positioning pin processing method provided in the embodiment of the present invention;

[0038] Figure 8 This is a schematic diagram of the structure of the positioning pin blank after machining the positioning block in the multi-axis angled irregular positioning pin machining method provided in an embodiment of the present invention.

[0039] Figure 9 This is a top view of the special fixture used in the multi-axis angled irregular locating pin machining method provided in an embodiment of the present invention;

[0040] Figure 10 This is a side view of the special fixture used in the multi-axis angled irregular locating pin machining method provided in an embodiment of the present invention;

[0041] Figure 11 This is a top view of the fixture body of the special fixture in the multi-axis angled irregular positioning pin machining method provided in the embodiment of the present invention;

[0042] Figure 12 This is a side view of the fixture body of the special fixture in the multi-axis angled irregular positioning pin machining method provided in the embodiment of the present invention;

[0043] Figure 13 This is a schematic diagram of the structure of a special fixture mounted on a horizontal lathe chuck in the multi-axis angled irregular positioning pin machining method provided in an embodiment of the present invention. Detailed Implementation

[0044] See Figure 1 and 2 The present invention provides a multi-axis angled irregular positioning pin 100, which is connected between the moving blade 30 and the rotor hub 40 of the wind tunnel compressor test prototype, and is used to adjust the angle of the moving blade 30.

[0045] See Figure 3 and Figure 4 The multi-axis angled irregular positioning pin 100 includes a positioning block 10 and a positioning pin 20. The positioning block 10 has a rectangular structure, and the positioning pin 20 has a cylindrical structure. The positioning pin 20 and the positioning block 10 are integrally formed.

[0046] The upper and lower planes of the positioning block 10 are connected to the positioning groove on the root of the moving blade 30 to position the moving blade 30 at an angle. The outer circle of the positioning pin 20 is connected to the circular pin hole on the rotor hub 40 to position the moving blade and the hub 40.

[0047] Since the wind tunnel centrifugal compressor simulation prototype achieves the simulation of aerodynamic parameters under different operating conditions by adjusting the angle of the moving blade 30, the corresponding moving blade 30 needs to be precisely adjusted to different angles under different operating conditions. Therefore, in order to accurately adjust the corresponding moving blade 30 to the corresponding angle under different operating conditions, the angle γ between the axis of the positioning block 10 and the axis of the positioning pin 20 needs to be set to different angles. Furthermore, the axis of the positioning block 10 and the axis of the positioning pin 20 must intersect at the rotation center axis of the moving blade 30. This facilitates the precise adjustment of the angle of the moving blade 30.

[0048] In one specific embodiment of the present invention, the angle between the centerline of the positioning block 10 and the centerline of the positioning pin 20 is 0 ≤ γ ≤ 4. Furthermore, since a typical wind tunnel centrifugal compressor simulator has 24 moving blades 30, each moving blade 30 requires three types of multi-axis angled irregularly shaped positioning pins 100 for angle adjustment. The angle γ between the centerline of the positioning block 10 and the centerline of the positioning pin 20 of these three types of multi-axis angled irregularly shaped positioning pins 100 is often set to 0°, 1°, or 4°. Therefore, for a large wind tunnel centrifugal compressor simulator, when installing and adjusting the 24 moving blades 30, a total of 24 x 3 = 72 multi-axis angled irregularly shaped positioning pins are needed to complete the adjustment of the four working angles (0°, 1°, 4°, and -4°) for each moving blade 30.

[0049] The present invention provides a multi-axis angled irregular positioning pin. Since the center line of the positioning block 10 and the center line of the positioning pin body 20 can be designed with different angles, the moving blades of the large wind tunnel centrifugal compressor simulation prototype can be precisely adjusted to a predetermined angle to achieve the simulation operation requirements of aerodynamic parameters under different working conditions.

[0050] This invention provides a machining method for multi-axis angled irregular-shaped locating pins. Addressing the unique structure of these pins and their challenges of small individual size, large assembly quantity, and multiple batches with varying angles (the angle γ between the centerline of the locating block 10 and the centerline of the locating pin 20 can have multiple angles, ranging from 0 ≤ γ ≤ 4), this method utilizes the multi-axis nature of the workpiece. The machining of the locating block 10 and the locating pin 20 are treated as two separate processes. Specifically, the locating block 10 is machined first, serving as the positioning basis for the subsequent machining of the locating pin 20. Simultaneously, a special fixture is used to hold the locating block 10 during the machining of the locating pin 20. This method enables high-efficiency and high-precision machining of multiple batches of multi-axis angled irregular-shaped locating pins with various angles γ. The specific machining method includes the following steps.

[0051] Step 1) Obtain the forging blank by forging and blanking, see [link to relevant documentation] Figure 5 The resulting forging blank dimensions include the lengths of several multi-axis angled irregular locating pin parts. This facilitates the centralized heat treatment and subsequent machining of multiple multi-axis angled irregular locating pin parts, improving both heat treatment and machining efficiency.

[0052] Step 2) Heat treatment of the forged blank is not only beneficial to the subsequent processing of multi-axis angled irregular locating pin parts, but also to improving the performance and strength of the processed multi-axis angled irregular locating pin parts.

[0053] Step 3) Roughly machine the heat-treated forging blank.

[0054] First, the heat-treated forging blank is rough-turned. During rough turning, center holes are drilled at both ends of the forging blank using a drilling machine. Then, the forging blank is rough-machined using a horizontal lathe. During rough machining, one end of the forging blank is clamped in the chuck of the horizontal lathe, and the center hole is supported by the tailstock center of the horizontal lathe. The forging blank is machined to the required dimensions according to the dimensions in the rough machining drawing.

[0055] In one specific embodiment of the present invention, the forging blank obtained by combined forging includes 12 multi-axis angled irregularly shaped locating pins. During rough machining, all corners and sharp edges, unless otherwise specified, should be rounded to R5. After rough machining, the forging blank undergoes heat treatment to achieve a hardness of HB235-285. Finally, the forging blank is subjected to ultrasonic testing and magnetic particle testing. The rough-machined forging blank is as follows... Figure 6 As shown.

[0056] Step 4) Cut the rough-machined forging blank into sections to obtain multiple locating pin blanks, as shown in the figure. Figure 7 As shown. The dimensions of the locating pin blank satisfy L1 = L + 10mm. Require.

[0057] Where L1 is the axial length of the locating pin blank after cutting, and L is the axial length of the multi-axis angled irregular locating pin after processing.

[0058] Step 5) Machining a positioning block with length, width and height of H, W and a respectively at one end of the positioning pin blank.

[0059] The method is as follows:

[0060] First, mark the machining lines of the positioning block 10 on one end of the positioning pin blank.

[0061] Then, use a milling machine vise to clamp the outer circle of the other end of the blank with a positioning pin.

[0062] Finally, according to the drawing requirements, the positioning block 10 is milled from the positioning pin blank using the machining line. (See also...) Figure 8 The dimensions of the milled positioning block 10 must meet the following requirements: 1. The dimensions of the positioning block 10, including length, width, height (H, W, a), must be accurate; 2. Both sides of the length (H) of the positioning block 10 must be parallel to the outer circle (ΦA1) of the positioning pin blank to a degree of 0.01 mm; 3. The width (W) of the positioning block 10 must meet the axial symmetry requirements.

[0063] Step 6) Clamp the positioning block 10 of the positioning pin blank onto the machine tool using a special fixture.

[0064] See Figure 9 and Figure 10 The special fixture includes a fixture body 1, a pressure plate 2, and a sliding plate 3. See also... Figure 11 and Figure 12 The clamp body 1 includes a connecting body 11 and a mounting plate 12. The connecting body 11 is a cylindrical structure, and the mounting plate 12 is integrally and vertically connected to one end of the connecting body 11. The axis of the mounting plate 12 coincides with the axis of the connecting body 11.

[0065] A keyway 13 is provided at the axial center position of the end of the mounting plate 12. The keyway 13 is matched with the size of the positioning block 10 of the positioning pin blank, and the angle between the axis of the keyway 13 and the axis of the mounting plate 12 is also γ. That is, the angle between the axis of the keyway 13 and the axis of the mounting plate 12 is equal to the angle between the axis of the positioning block 10 and the axis of the positioning pin 20.

[0066] Meanwhile, the thickness of the mounting plate 12 is equal to the width W of the positioning block 10. When the positioning block 10 of the positioning pin blank is installed in the keyway 13, the positioning block 10 installed in the keyway 13 is pressed and fixed by the pressure plate 2 and the drag plate 3 connected to the upper and lower sides of the mounting plate 12.

[0067] In one specific embodiment of the present invention, the slide plate 3 is provided with four connecting holes, and the mounting plate 12 is provided with four threaded holes that match the position and size of the four connecting holes on the slide plate 3. Simultaneously, the pressure plate 2 is provided with three mounting holes, and the mounting plate 12 is provided with three threaded holes that match the position and size of the three mounting holes on the pressure plate 2. In use, the slide plate 3 and the mounting plate 12 are first connected by bolts 4, and the slide plate 3 does not need to be disassembled during subsequent use. Then, the positioning block 10 of the positioning pin blank is inserted into the keyway 13. Finally, the pressure plate 2 and the mounting plate 12 are connected by bolts 4, thus firmly fixing the positioning block 10 of the positioning pin blank into the keyway 13 of the special fixture mounting plate 12.

[0068] See Figure 13 After the positioning block 10 of the positioning pin blank is fixed in the keyway 13, the special fixture is then clamped on the horizontal lathe. The chuck of the horizontal lathe is equipped with multiple jaws, which clamp one end of the connecting body 11 of the special fixture fixture body 1, thereby fixing the special fixture on the chuck of the horizontal lathe. After the special fixture is clamped, it is aligned using a dial indicator by checking the outer diameter and end face of the connecting body 11.

[0069] Step 7) After aligning the special fixture with a dial indicator, machine a locating pin body 20 with an axial length of b and a diameter of d from the other end of the locating pin blank by turning. During machining, the axis of the locating pin body 20 remains aligned with the axis of the connecting body 11 and the mounting plate 12 of the special fixture fixture body 1. The final machined locating pin is a multi-axis angular irregular locating pin with an angle γ between its axis and the axis of the locating block 10. The final machined multi-axis angular irregular locating pin is shown below. Figure 3 and Figure 4 As shown.

[0070] During the turning process of the locating pin 20, it is necessary to ensure the dimensional accuracy of the diameter d of the locating pin 20. The turning process can use conventional external turning parameters, controlling the turning speed of the locating pin 20 at 200-250 m / min, the feed rate at 0.1-0.2 mm / r, and the depth of cut at 0.1-0.4 mm. In one specific embodiment of the invention, the cutting speed for machining the locating pin 20 is controlled at 220 m / min, the feed rate at 0.1 mm / r, and the depth of cut at 0.2 mm.

[0071] Because the keyway 13 of the special fixture and the axis of the connecting body 11 of the special fixture have a fixed included angle γ, when the positioning block 10 of the positioning pin blank is installed in the keyway 13, the positioning pin blank is in an angled state. During machining, the tool is aligned and set according to the axis of the connecting body 11 of the special fixture, and the cylindrical pin part of the positioning pin body 20 is machined according to the axis of the connecting body 11 of the special fixture. After machining, the axis of the cylindrical pin part of the positioning pin body 20 and the positioning block 10 in the keyway 13 of the special fixture maintain a fixed included angle. Thus, the machined multi-axis angled irregular positioning pin meets and ensures the angle and coaxiality requirements of the positioning block 10 and the positioning pin body 20 during use.

[0072] After machining the first multi-axis angled irregular locating pin, continue machining a batch of locating pin blanks into multi-axis angled irregular locating pins with the same angle between the centerline of the locating block 10 and the centerline of the locating pin body 20, following the above machining method. Since the centerlines of the locating blocks 10 and the locating pin bodies 20 of this batch of locating pin blanks are equal, it is not necessary to change the special fixture when machining the locating pin body 20 of the multi-axis angled irregular locating pin. Simply remove the bolts 4 on the pressure plate 2, take out the multi-axis angled irregular locating pin that has been machined in the keyway 13 of the mounting plate 12, install the next locating pin blank with the machined locating block 10 in the keyway 13 of the mounting plate 12, and then install the pressure plate 2 on the mounting plate 12 with the bolts 4 to fix the locating pin blank, and then machine the locating pin body 20.

[0073] Since a typical wind tunnel centrifugal compressor prototype has 24 moving blades, each blade requires three types of multi-axis angled irregular-shaped locating pins with angles γ of 0°, 1°, and 4° between the centerline of the locating block 10 and the centerline of the locating pin body 20. Therefore, in the actual machining process of these multi-axis angled irregular-shaped locating pins, three special fixtures are often required. Specifically, three special fixtures are needed, each with an angle γ of 0°, 1°, or 4° between the centerline of the keyway 13 and the centerline of the mounting plate 12, to machine the three types of multi-axis angled irregular-shaped locating pins with angles γ of 0°, 1°, or 4° between the centerline of the locating pin body 20 and the centerline of the locating block 10.

[0074] After machining a multi-axis angled irregular locating pin where the angle between the centerline of the locating block 10 and the centerline of the locating pin 20 is a certain angle, if it is necessary to machine a multi-axis angled irregular locating pin where the angle between the centerline of the locating block 10 and the centerline of the locating pin 20 is other angles, simply replace the special fixture with one that has the same angle between the centerline of the keyway 13 and the centerline of the mounting plate 12 as the angle between the centerline of the locating block 10 and the centerline of the locating pin 20. Then, process it according to the above method to complete the machining of other types of multi-axis angled irregular locating pins.

[0075] This invention provides a method for machining multi-axis angled irregular-shaped locating pins. The locating block and the locating pin body are machined separately. When machining the locating pin body, a special fixture with a keyway at the axial center of the mounting plate is used. The angle between the axis of the keyway and the axis of the mounting plate is equal to the angle between the axis of the locating block and the locating pin body. This fixes the locating block in the keyway. The locating pin body is then machined at the other end of the locating pin blank using a turning method. The axis of the machined locating pin body coincides with the axis of the fixture body and the axis of the mounting plate. This ensures that the angle between the axis of the locating pin body and the axis of the locating block reaches a predetermined angle, thus achieving precise machining of the multi-axis angled irregular-shaped locating pin.

[0076] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for machining multi-axis angular irregularly shaped locating pins, characterized in that, The positioning pin connects the moving blade and rotor hub of the wind tunnel compressor prototype and is used to adjust the angle of the moving blade. The positioning pin includes... Positioning block and positioning pin integrally connected to the positioning block; The positioning block is connected to the moving blade, and the positioning pin is connected to the rotor hub; The centerline of the positioning block and the centerline of the positioning pin intersect at the rotation center axis of the moving blade; The angle between the centerline of the positioning block and the centerline of the positioning pin is 0≤γ≤4; The positioning block has a rectangular structure, the positioning pin has a cylindrical structure, and the positioning pin and the positioning block are an integral structure. The upper and lower planes of the positioning block are connected to the positioning groove on the root of the moving blade to position the angle of the moving blade. The outer circle of the positioning pin is connected to the positioning pin hole of the hub to position the moving blade and the hub. The processing method for the positioning pin includes the following steps: Forging involves blanks with multiple locating pin lengths; Heat treatment of forged billets; Rough machining of the heat-treated billet; The rough-machined blank is cut into sections to obtain multiple locating pin blanks with dimensions that meet the requirements of L1=L+10mm and ΦA1=+5mm; A positioning block with length, width, and height of H, W, and a is machined at one end of the positioning pin blank; The positioning block of the positioning pin blank is clamped onto the machine tool using a special fixture; A positioning pin body with an axial length of b and a diameter of d is machined at the other end of the positioning pin blank, and the angle between the axis of the pin and the axis of the positioning block is 0≤γ≤4. Where L1 is the axial length of the locating pin blank after cutting, and L is the axial length of the multi-axis angled irregular locating pin after processing.

2. The processing method for multi-axis angular irregular positioning pins according to claim 1, characterized in that: The special fixture includes a fixture body, a pressure plate, and a sliding plate. The fixture body includes a cylindrical connecting body and a mounting plate. The mounting plate is integrally and vertically connected to one end of the connecting body, and the axis of the mounting plate coincides with the axis of the connecting body.

3. The processing method for multi-axis angular irregular positioning pins according to claim 2, characterized in that: A keyway is provided at the axial center position of the end of the mounting plate. The keyway is matched in size with the positioning block of the positioning pin blank, and the angle between the axis of the keyway and the axis of the mounting plate is γ. The positioning block of the positioning pin blank is installed in the keyway and fixed by pressure plates and slide plates connected to the upper and lower sides of the mounting plate.

4. The processing method for multi-axis angular irregular positioning pins according to claim 3, characterized in that: The positioning block of the positioning pin blank is fixed in the keyway. The special fixture is clamped on the chuck of the horizontal lathe through the connecting body. Then, the special fixture is aligned by dial indicator by the outer circle and end face of the connecting body.

5. The processing method for multi-axis angular irregular positioning pins according to claim 4, characterized in that: After the special fixture is aligned using a dial indicator, the positioning pin body is machined at the other end of the positioning pin blank by turning. The centerline of the machined positioning pin body forms an angle γ with the centerline of the positioning block body, and coincides with the centerline of the fixture body connecting body and the mounting plate.

6. The machining method for multi-axis angular irregularly shaped locating pins according to claim 5, characterized in that: The cutting speed for turning the positioning pin is 200-250 m / min, the feed rate is 0.1-0.2 mm / r, and the depth of cut is 0.1-0.4 mm.

7. The machining method for multi-axis angular irregularly shaped locating pins according to any one of claims 1-6, characterized in that: The multi-axis angled irregular-shaped positioning pins include various multi-axis angled irregular-shaped positioning pins with an angle γ of 0°, 1° or 4° between the centerline of the positioning pin body and the centerline of the positioning block body. The special fixtures include various special fixtures with an angle γ of 0°, 1° or 4° between the centerline of the keyway and the centerline of the mounting plate.

Images