Part positioning clamp

Abstract

The utility model relates to the technical field of mechanical clamps, in particular to a part positioning clamp. The first clamping mechanism, the second clamping mechanism, the third clamping mechanism and the fourth clamping mechanism are sequentially arranged on the workbench clockwise along the plane of the workbench, and the second clamping mechanism and the third clamping mechanism are located on the same side edge of the workbench. The first clamping mechanism and the third clamping mechanism comprise supporting columns and oil cylinder corner pressing heads. The pressing head of the oil cylinder corner pressing head is vertically arranged above the supporting column and is close to the supporting column but not in contact with the supporting column; positioning columns for positioning parts are further arranged on the sides, close to the edge of the workbench, of the supporting columns; the second clamping mechanism comprises an oil cylinder corner pressing head and a contact oil cylinder. The telescopic direction of a piston rod of the contact oil cylinder points to the pressing head of the oil cylinder corner pressing head. The fourth clamping mechanism comprises a supporting column and an oil cylinder corner pressing head. And the pressing head of the oil cylinder corner pressing head is vertically arranged above the supporting column and is close to the supporting column but not in contact with the supporting column. By means of three-point positioning and two-point inserting connection and in cooperation with the contact oil cylinder, the flatness of the machined end face is guaranteed.

Description

Technical Field

[0001] This application relates to the technical field of mechanical fixtures, and more particularly to a part positioning fixture. Background Art

[0002] In the field of part manufacturing, the process from raw materials to finished products involves multiple key steps. The casting of the blank part is crucial as the initial forming stage, and then it needs to go through a series of precision machining steps such as drilling, grooving, and grinding to achieve the required accuracy and functionality of the design. However, when the part enters the finish machining stage, how to ensure the stable positioning of the part during the machining process has become a technical problem to be solved urgently.

[0003] Specifically, for traditional square frame parts, due to factors such as material shrinkage and mold accuracy during the casting process of their blank parts, there may be certain differences in shape and size. This inconsistency poses challenges to subsequent machining positioning. Traditionally, although the four-point positioning method can fix the part to a certain extent, due to the fact that the four corner points of the square frame may not be in the same plane, or due to the irregularity of the blank part, there may be slight non-parallelism or non-levelness between the positioning points, which in turn causes the part to float during the machining process. This floating not only leads to uneven machining end faces, but also may cause a series of problems such as increased tool wear, reduced machining efficiency, and non-compliance of the final product quality. Summary of the Utility Model

[0004] To solve the problems of uneven machining end faces, unstable positioning, and thus reduced machining accuracy, increased tool wear, reduced machining efficiency, and non-compliance of product quality caused by the shape and size differences of the blank parts of traditional square frame parts during the finish machining stage, this application provides a part positioning fixture.

[0005] A part positioning fixture provided by this application adopts the following technical solutions:

[0006] A part positioning fixture includes a workbench and a first clamping mechanism, a second clamping mechanism, a third clamping mechanism, and a fourth clamping mechanism that are sequentially arranged on the workbench in a clockwise direction along the plane of the workbench. The second clamping mechanism and the third clamping mechanism are located on the same side of the workbench;

[0007] Among them, both the first clamping mechanism and the third clamping mechanism include: a support column for supporting the part, and an oil cylinder corner press head for pressing the part. The press head of the oil cylinder corner press head is vertically arranged above the support column, close to each other but not in contact. A positioning column for part positioning is also arranged on the side of the support column close to the edge of the workbench;

[0008] The second clamping mechanism includes: an oil cylinder corner press head for pressing the part and a contact oil cylinder, and the telescopic direction of the piston rod of the contact oil cylinder points to the press head of the oil cylinder corner press head;

[0009] The fourth clamping mechanism includes: a support column for supporting the part and an oil cylinder corner press head for pressing the part. The press head of the oil cylinder corner press head is vertically arranged above the support column, being close to each other but not in contact.

[0010] By adopting the above technical solutions: The three-point positioning and two-point insertion method (positioning one plane through three support columns and positioning posts) adopted by the fixture, in combination with the contact oil cylinder, realizes stable positioning of the part during the processing. The three-point positioning and two-point insertion ensure the stability of the part on one plane, while the contact oil cylinder adapts to and fixes the fourth point of the part through the telescopic movement of its piston rod. When the piston rod extends and touches an obstacle, it will automatically stop, thereby ensuring that the part is jointly fixed with the supporting oil cylinder corner press head, further improving the positioning accuracy.

[0011] The circular column allows the part to be rotated and adjusted after being inserted into the positioning, to adapt to different angle or position requirements, while the hexagonal column provides a more stable positioning reference, ensuring that the part can be accurately inserted after adjusting the angle.

[0012] Preferably, positioning seats for installing the positioning posts are arranged at the bottoms of the positioning posts in the first clamping mechanism and the third clamping mechanism.

[0013] By adopting the above technical solutions: The positioning seat provides a more stable installation foundation for the positioning post. It can not only ensure that the positioning post will not loosen or shift due to force during the working process, but also further improve the matching accuracy between the positioning post and the part through its precise machining and installation accuracy, thereby enhancing the positioning stability of the entire fixture.

[0014] At the same time, it will make the installation of the positioning post more convenient and fast. The operator only needs to accurately insert the positioning post into the positioning seat and perform the necessary fixing operations to complete the installation. In addition, if it is necessary to adjust the position or angle of the positioning post, it can also be achieved by adjusting the positioning seat, improving the flexibility and adaptability of the fixture.

[0015] Preferably, the positioning post in the first clamping mechanism is a hexagonal column.

[0016] By adopting the above technical solutions: The hexagonal column has more positioning surfaces compared to the circular column. During the installation process of the part, these positioning surfaces can cooperate more closely with the corresponding structures on the part, thereby providing a more precise positioning effect. Moreover, the multiple sides of the hexagonal column also help to reduce the possibility of the part rotating or moving during the processing, enhancing the positioning stability.

[0017] In addition, the unique shape of the hexagonal column makes the installation process more intuitive and simple. The operator only needs to align the installation holes or protrusions on the part with the positioning posts and insert them, without complex adjustment or calibration steps, and there is no need for a perfect fit. This not only improves the installation efficiency but also reduces the problem of inaccurate positioning caused by human error.

[0018] Preferably, the positioning post in the third clamping mechanism is a circular column.

[0019] By adopting the above technical solution: The design of the circular column allows the part to be rotated and adjusted after being inserted into the positioning post. This flexibility is particularly important during the machining process, especially when it is necessary to adjust the angle or direction of the part to meet specific machining requirements. The smooth surface of the circular column reduces the friction and resistance during rotation, making the adjustment process smoother and more precise.

[0020] Preferably, between the workbench and the first clamping mechanism, the second clamping mechanism, the third clamping mechanism, and the fourth clamping mechanism, there are pads for carrying the clamping mechanisms.

[0021] By adopting the above technical solution: The design of the pads makes the installation and disassembly of the clamping mechanisms on the workbench easier. When it is necessary to adjust the position or angle of the clamping mechanism, only the fixing bolts on the pads need to be loosened to make fine adjustments. In addition, the pads are also convenient for cleaning and maintenance. When it is necessary to clean the workbench or check the fixture status, the pads can be easily removed for operation.

[0022] At the same time, it can also ensure that the installation position of each clamping mechanism on the workbench is accurate and stable. Since the pads usually have precise dimensions and shapes, they can compensate for the unevenness or manufacturing errors of the workbench surface, thereby ensuring the relative position between the clamping mechanism and the part is accurate without error, helping to improve the positioning accuracy during the machining process and reducing the machining errors caused by inaccurate positioning.

[0023] Preferably, the pads are provided with fixing components fixed to the workbench.

[0024] By adopting the above technical solution: The fixing components can ensure the stable installation of the pads on the workbench, preventing them from moving or loosening due to the force during the machining process. This stability is crucial for ensuring the relative position relationship between the clamping mechanism and the part, helping to reduce the machining errors caused by position deviation.

[0025] Preferably, the fixing components include a number of fastening holes opened on the pads, bolts installed in the fastening holes, and installation holes opened on the workbench corresponding to the number of fastening holes.

[0026] By adopting the above technical solution: The bolt tightly connects the cushion block with the mounting hole on the workbench, which can ensure the stable installation of the cushion block on the workbench. The tightening force of the bolt can be adjusted according to needs to adapt to different working environments and processing requirements. This tightening method has high stability and reliability, and can prevent the cushion block from moving or loosening during the processing.

[0027] Preferably, the workbench further includes a second processing area for turning the part over for processing. The second processing area includes: a fifth clamping mechanism, a sixth clamping mechanism, a seventh clamping mechanism, and an eighth clamping mechanism that are sequentially arranged on the workbench in a clockwise direction along the plane of the workbench. The fifth clamping mechanism and the eighth clamping mechanism are located on the same side of the workbench.

[0028] By adopting the above technical solution: The setting of the second processing area enables the part to be quickly turned over to the other side for processing after one side of the part is processed. This continuous processing method greatly reduces the auxiliary time during the processing and improves the overall processing efficiency.

[0029] Preferably, the fifth clamping mechanism, the seventh clamping mechanism, and the eighth clamping mechanism all include: a support column for supporting the part, and an oil cylinder corner press head for pressing the part. The press head of the oil cylinder corner press head is vertically arranged above the support column, close to each other but not in contact.

[0030] By adopting the above technical solution: The oil cylinder corner press head is vertically arranged above the support column, which can ensure that a vertically downward pressure is provided when pressing the part, thereby preventing the part from shifting or rotating during the processing. At the same time, the design that the press head and the support column are close to each other but not in contact not only ensures sufficient clamping force but also avoids the wear and scratches that may be caused by direct contact, which is beneficial to protecting the surface quality of the part;

[0031] Precisely controlling the pressure and angle of the oil cylinder corner press head can ensure that the part maintains a stable posture and position during the processing, thereby improving the processing accuracy.

[0032] Preferably, the sixth clamping mechanism includes: a support column for supporting the part, and an oil cylinder corner press head for pressing the part. The press head of the oil cylinder corner press head is vertically arranged above the support column, close to each other but not in contact. A positioning column for positioning the part is arranged on the support column, and the positioning column is a hexagonal column.

[0033] By adopting the above technical solution: Since the hexagonal positioning column has clear corners and positioning surfaces, the part can be more easily aligned with the positioning column when placed, reducing the problem of inaccurate positioning caused by human operation or mechanical errors.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] 1. The fixture of this application adopts a method of three-point positioning (through three support columns), two-point insertion (through two positioning columns), and cooperation with a contact oil cylinder, achieving stable positioning of parts during the machining process. This combination method not only ensures the stability of parts on a plane but also further improves the accuracy and stability of positioning, effectively reducing the offset and rotation of parts during machining, thereby improving the machining accuracy.

[0036] 2. The design of the positioning seat and cushion block in this application makes the installation, disassembly, and adjustment of the clamping mechanism on the workbench easier and faster. Operators can easily perform fine-tuning or replace the clamping mechanism to meet different machining requirements. This flexibility not only improves the machining efficiency but also reduces the downtime and maintenance costs.

[0037] 3. The setting of the second machining area in this application enables the parts to be quickly flipped to the other side for machining after one side is machined, realizing a continuous machining process, thereby significantly improving the overall machining efficiency.

[0038] 4. In this application, hexagonal columns and circular columns are respectively used as positioning columns in the first clamping mechanism and the third clamping mechanism. The circular column ensures that the parts can be inserted for positioning and rotated for adjustment, and the hexagonal column facilitates the insertion of the parts after the rotation adjustment angle. This not only meets the positioning stability under different machining requirements but also provides flexibility. Description of the Drawings

[0039] Figure 1 is the overall structural schematic diagram of the embodiment of this application;

[0040] Figure 2 is the overall structural schematic diagram of the first clamping mechanism of the embodiment of this application installed on the workbench;

[0041] Figure 3 is the overall structural schematic diagram of the second clamping mechanism of the embodiment of this application installed on the workbench;

[0042] Figure 4 is the overall structural schematic diagram of the third clamping mechanism of the embodiment of this application installed on the workbench;

[0043] Figure 5 is the overall structural schematic diagram of the fourth clamping mechanism of the embodiment of this application installed on the workbench;

[0044] Figure 6 is the exploded structural schematic diagram of the fourth clamping mechanism of the embodiment of this application installed on the workbench with other components hidden;

[0045] Figure 7 is the overall structural schematic diagram of the fifth clamping mechanism of the embodiment of this application installed on the workbench;

[0046] Figure 8 This is a schematic diagram of the overall structure of the sixth clamping mechanism of the embodiment of the present application installed on the workbench.

[0047] Reference numerals: 1, workbench; 2, first clamping mechanism; 3, second clamping mechanism; 4, third clamping mechanism; 5, fourth clamping mechanism; 6, hexagonal column; 7, circular column; 8, support column; 9, oil cylinder corner press head; 91, press head; 10, contact oil cylinder; 11, positioning seat; 12, spacer block; 13, fixing component; 131, fastening hole; 132, bolt; 133, mounting hole; 14, second processing area; 141, fifth clamping mechanism; 142, sixth clamping mechanism; 143, seventh clamping mechanism; 144, eighth clamping mechanism. Detailed implementation manners

[0048] The following further elaborates on the present application in conjunction with the attached Figure 1-7 drawings. Embodiment

[0049] An embodiment of the present application discloses a part positioning fixture. Referring to Figure 1 , it includes a workbench 1. A processing area is provided on the workbench 1, which consists of two parts, namely a first processing area and a second processing area 14. The first processing area is located at the right side position on the workbench 1, and the second processing area 14 is located on the left side of the first processing area;

[0050] Among them, the first processing area is composed of a first clamping mechanism 2, a second clamping mechanism 3, a third clamping mechanism 4, and a fourth clamping mechanism 5 that are sequentially installed on the workbench 1 in a clockwise direction along the plane of the workbench 1. The second clamping mechanism 3 and the third clamping mechanism 4 are located on the same side of the workbench 1;

[0051] Referring to Figure 2 and Figure 3 , the first clamping mechanism 2 is composed of a support column 8, an oil cylinder corner press head 9, and a positioning column. The press head 91 of the oil cylinder corner press head 9 is vertically arranged above the support column 8, being close to each other but not in contact. A positioning column is installed on the side of the support column 8 close to the edge of the workbench 1, and a positioning seat 11 is installed below the positioning column. Among them, the positioning column is a hexagonal column 6; the second support mechanism is composed of an oil cylinder corner press head 9 and a contact oil cylinder 10. The telescopic direction of the piston rod of the contact oil cylinder 10 points to the press head 91 of the oil cylinder corner press head 9. When the piston rod of the contact oil cylinder 10 extends and touches an obstacle, it will stop, thereby fixing one point of the part with the matching oil cylinder corner press head 9;

[0052] Referring to Figure 4 and Figure 5The third clamping mechanism 4 is basically the same as the first clamping mechanism 2, the only difference being that the positioning column is a circular column 7; the fourth clamping mechanism 5 is composed of a support column 8 and a cylinder angle pressure head 9, and the pressure head 91 of the cylinder angle pressure head 9 is vertically arranged above the support column 8, close to each other but not in contact;

[0053] The pressing arms of the oil cylinder angle pressing heads 9 in the first clamping mechanism 2, the second clamping mechanism 3, the third clamping mechanism 4 and the fourth clamping mechanism 5 are kept parallel to the long side of the workbench 1;

[0054] When the rectangular part is placed in the first processing area, the circular column 7 of the third clamping mechanism 4 allows the part to be inserted and positioned and rotated and adjusted, and the hexagonal column 6 of the first clamping mechanism 2 allows the part to be easily inserted after being rotated to a certain adjustment angle. Through the specific shape of the hexagonal column 6, the part can be stably inserted into the preset position after being rotated and adjusted to the required angle, achieving preliminary positioning and alignment, and providing an accurate reference for subsequent processing steps;

[0055] In general, the strategy of "three-point positioning and two-point plug-in" is adopted. Specifically, the support columns 8 on the first clamping mechanism 2, the third clamping mechanism 4 and the fourth clamping mechanism 5 work together with the cylinder angle pressure head 9 to form a stable plane positioning foundation. The three-point positioning ensures the precise position of the parts on a horizontal plane.

[0056] The contact oil cylinder 10 on the second clamping mechanism 3 is closely matched with the matching oil cylinder angle pressure head 9 to fix the fourth point of the part, that is, the position in the vertical direction, thereby realizing all-round three-dimensional fixation. This design not only enhances the stability of the part during processing, but also greatly reduces the position deviation caused by vibration or external force.

[0057] At the same time, the hexagonal column 6 on the first clamping mechanism 2 and the circular column 7 on the third clamping mechanism 4 are connected at two points to further ensure the precise alignment of the parts at specific angles and directions. The special shape of the hexagonal column 6 provides a stable insertion point for the part after rotation adjustment, while the circular column 7 provides a smooth insertion path. The two cooperate with each other so that the parts can be quickly and accurately positioned at the predetermined position, providing a strong guarantee for efficient and high-quality processing and production.

[0058] In order to facilitate the installation and disassembly of the clamping mechanism on the workbench 1, a bearing block is installed between the first clamping mechanism 2, the second clamping mechanism 3, the third clamping mechanism 4, the fourth clamping mechanism 5 and the workbench 1. Taking the fourth clamping mechanism 5 as an example, refer to Figure 6, a fixing component 13 is installed on the spacer block 12, including fastening holes 131 opened at the four corners of the spacer block 12, bolts 132 installed in the fastening holes 131, and mounting holes 133 opened on the workbench 1 corresponding to the fastening holes 131. Insert the bolt 132 into the fastening hole 131, align the fastening hole 131 with the mounting hole 133, and tighten the bolt 132 to fixedly install the spacer block 12 on the workbench 1.

[0059] The second working area is composed of a fifth clamping mechanism 141, a sixth clamping mechanism 142, a seventh clamping mechanism 143, and an eighth clamping mechanism 144 that are sequentially arranged on the workbench 1 in a clockwise direction along the plane of the workbench 1. The fifth clamping mechanism 141 and the eighth clamping mechanism 144 are located on the same side of the workbench 1. The pressing arms of the oil cylinder corner press heads 9 in the fifth clamping mechanism 141, the sixth clamping mechanism 142, the seventh clamping mechanism 143, and the eighth clamping mechanism 144 are parallel to the wide side of the workbench 1;

[0060] The fifth clamping mechanism 141, the seventh clamping mechanism 143, and the eighth clamping mechanism 144 have the same structural composition, and are both composed of a support column 8 and an oil cylinder corner press head 9. The press head 91 of the oil cylinder corner press head 9 is vertically aligned above the support column 8, close to each other but not in contact. The sixth clamping mechanism 142 is composed of a support column 8 and an oil cylinder corner press head 9, and a positioning column with a hexagonal column 6 is vertically installed in the support column 8.

[0061] Thanks to the establishment of the second processing area 14, the parts can be directly turned over for processing in the second processing area 14 after being processed in the first processing area, realizing continuous processing, greatly reducing the auxiliary time during the processing, and improving the overall processing efficiency.

[0062] The working process and implementation principle of the embodiment are as follows:

[0063] Place the parts in the first processing area to ensure that the parts can contact the circular column 7 of the third clamping mechanism 4, which is convenient for subsequent insertion and rotation adjustment. Adjust the oil cylinder corner press heads 9 of each clamping mechanism to the initial position to ensure that they do not directly contact the parts to avoid damage when not fixed;

[0064] Through the circular column 7 of the third clamping mechanism 4, the parts can be smoothly inserted and rotated for adjustment to find the best processing angle. At the same time, the hexagonal column 6 of the first clamping mechanism 2 serves as a stable clamping point after rotation adjustment. After the parts are rotated to the predetermined angle, they can be stably clamped into the hexagonal column 6 to achieve preliminary positioning and alignment;

[0065] After preliminary positioning, the oil cylinder corner press heads 9 of the first clamping mechanism 2, the third clamping mechanism 4, and the fourth clamping mechanism 5 start to work. Their pressing arms move downward, contact the surface of the parts and apply pressure to achieve stable fixation on the horizontal plane;

[0066] The contact cylinder 10 of the second clamping mechanism 3 cooperates with the supporting cylinder angle press head 9. By extending and retracting the piston rod of the contact cylinder 10, the fourth point (the position in the vertical direction) of the part is found and fixed, so as to realize the all-round three-dimensional fixation. After the part is stably fixed, the machining operations in the first machining area, such as drilling, milling, etc., can be carried out.

[0067] After the machining in the first machining area is completed, the part is taken out from the first machining area, turned over and placed in the second machining area 14; the clamping mechanism in the second machining area 14 fixes and machines the part in the same way, realizing continuous machining, reducing the auxiliary time and improving the machining efficiency.

[0068] The clamping system adopts a modular design. The first clamping mechanism 2, the third clamping mechanism 4 and the fourth clamping mechanism 5 form a three-point positioning basis on the workbench 1 through the cooperation of the support column 8 and the cylinder angle press head 9, ensuring the stable position of the part on the horizontal plane. The second clamping mechanism 3 uses the contact cylinder 10 and the supporting cylinder angle press head 9 to further fix the vertical position of the part, realizing the all-round three-dimensional fixation;

[0069] Particularly, the hexagonal column 6 of the first clamping mechanism 2 and the circular column 7 of the third clamping mechanism 4, through a unique two-point plug-in method, not only provide the flexibility of rotation adjustment for the part, but also ensure the precise alignment of the part at a specific angle and direction. This design not only improves the machining accuracy, but also ensures the stability of the machining process;

[0070] In addition, the workbench 1 is cleverly divided into two machining areas. The first machining area is used for preliminary machining, while the second machining area 14 is used for turning over and machining of the part. This layout reduces the auxiliary time in the machining process, realizes continuous machining, and thus significantly improves the overall machining efficiency.

[0071] The above is the preferred embodiment of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A part positioning fixture, characterized in that, It includes a workbench (1), and a first clamping mechanism (2), a second clamping mechanism (3), a third clamping mechanism (4) and a fourth clamping mechanism (5) which are sequentially arranged on the workbench (1) in a clockwise direction along the plane of the workbench (1). The second clamping mechanism (3) and the third clamping mechanism (4) are located on the same side of the workbench (1). Among them, both the first clamping mechanism (2) and the third clamping mechanism include: a support column (8) for supporting the part, and an oil cylinder corner press head (9) for pressing the part. The press head (91) of the oil cylinder corner press head (9) is vertically arranged above the support column (8), close to each other but not in contact. A positioning column for part positioning is also arranged on the side of the support column (8) close to the edge of the workbench (1). The second clamping mechanism (3) includes: an oil cylinder corner press head (9) for pressing the part and a contact oil cylinder (10). The telescopic direction of the piston rod of the contact oil cylinder (10) points to the press head (91) of the oil cylinder corner press head (9). The fourth clamping mechanism (5) includes: a support column (8) for supporting the part, and an oil cylinder corner press head (9). The press head (91) of the oil cylinder corner press head (9) is vertically arranged above the support column (8), close to each other but not in contact.

2. The part positioning fixture according to claim 1, wherein, At the bottom of the positioning columns in the first clamping mechanism (2) and the third clamping mechanism (4), positioning seats (11) for installing the positioning columns are provided.

3. The part positioning fixture according to claim 2, characterized in that, The positioning column in the first clamping mechanism (2) is a hexagonal column (6).

4. The part positioning fixture according to claim 2, wherein The positioning column in the third clamping mechanism (4) is a circular column (7).

5. The part positioning fixture according to claim 1, characterized in that, Between the workbench (1) and the first clamping mechanism (2), the second clamping mechanism (3), the third clamping mechanism (4), and the fourth clamping mechanism (5), pads (12) for carrying the clamping mechanisms are provided.

6. The part positioning fixture according to claim 5, characterized in that, On the pad (12), a fixing component (13) fixed to the workbench (1) is provided.

7. The part positioning fixture according to claim 6, characterized in that, The fixing component (13) includes a plurality of fastening holes (131) opened on the pad (12), bolts (132) installed in the fastening holes (131), and installation holes (133) opened on the workbench (1) corresponding to the plurality of fastening holes (131).

8. The part positioning fixture according to claim 1, wherein, On the workbench (1), there is also a second processing area (14) for part turning processing. The second processing area (14) includes: a fifth clamping mechanism (141), a sixth clamping mechanism (142), a seventh clamping mechanism (143) and an eighth clamping mechanism (144) which are sequentially arranged on the workbench (1) in a clockwise direction along the plane of the workbench (1). The fifth clamping mechanism (141) and the eighth clamping mechanism (144) are located on the same side of the workbench (1).

9. The part positioning fixture according to claim 8, characterized in that, The fifth clamping mechanism (141), the seventh clamping mechanism (143) and the eighth clamping mechanism all include: a support column (8) for supporting the part, and an oil cylinder corner press head (9). The press head (91) of the oil cylinder corner press head (9) is vertically arranged above the support column (8), close to each other but not in contact.

10. The part positioning fixture according to claim 8, characterized in that, The sixth clamping mechanism (142) includes: a support column (8) for supporting a part, and an oil cylinder corner press head (9) for pressing the part. The press head (91) of the oil cylinder corner press head (9) is vertically arranged above the support column (8), being close to each other but not in contact. A positioning column for positioning the part is arranged on the support column (8), and the positioning column is a hexagonal column (6).

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