Pin hole positioning tool for machining

Abstract

The utility model discloses a pin hole positioning tool for machining, which relates to the technical field of machining, and comprises a bottom plate, a support plate arranged above the bottom plate, a support reference arranged on the upper surface of the support plate, a workpiece arranged on the upper surface of the support reference, and a rhombic positioning pin and a circular positioning pin movably sleeved in the workpiece, the positioning precision can be affected when a workpiece rotates around the round positioning pin, so that the diamond positioning pin is added, rotation of the workpiece can be limited in the Y direction, meanwhile, the diamond positioning pin does not make contact with the inner wall of the pin hole in the X direction, secondary positioning in the X direction can be avoided, and through the mode that the round positioning pin and the diamond positioning pin are installed in a diagonal mode, center positioning is achieved, and positioning precision is improved. The positioning device is simple in structure and capable of limiting rotation of workpieces, positioning accuracy is guaranteed, the requirement for precision part machining is met, the positioning mode is suitable for machining of precision parts such as automobile engine parts, positioning accuracy can be guaranteed when the parts are placed, and clamping stagnation is not prone to occurring when the parts are taken and placed.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and in particular to a pin hole positioning fixture for machining. Background Technology

[0002] Pin hole positioning fixtures play a vital role in the machinery manufacturing industry, primarily used for positioning precision parts during machining, such as automotive engine parts (connecting rods, crankshafts, bearings, cylinder blocks, cylinder heads, etc., which are assembled and positioned using pin holes). Their function is to accurately determine the part's position during machining based on the pin holes, thereby ensuring the accuracy of subsequent machining and being crucial for improving product quality and production efficiency.

[0003] In practical applications, pin hole positioning fixtures for machining typically include the following key components:

[0004] 1. Locating pin assembly: It is generally composed of round locating pins and diamond locating pins. The round locating pins are used to determine the center position of the part, while the diamond locating pins play the role of restricting the rotation of the part. The two work together to achieve precise positioning of the part.

[0005] 2. Support structure: The most common type is the base plate, which provides a stable support platform for the locating pins and the parts to be processed, ensuring that the parts will not shift or shake during the processing.

[0006] 3. Auxiliary devices: Some tooling is equipped with auxiliary devices, such as clamping mechanisms, to stabilize the parts during processing and prevent the parts from shifting due to external forces.

[0007] Currently, various pin-hole positioning tooling solutions are used in the industry to achieve precise positioning. Some tooling adopts an integrated design, fixing the positioning pin and the base plate together to ensure a certain level of accuracy when machining parts of specific specifications; others improve positioning accuracy by optimizing the shape and size of the positioning pin; in addition, some advanced tooling introduces high-precision measuring instruments to assist positioning in order to meet higher machining accuracy requirements.

[0008] However, existing implementation methods still have many problems. Regarding positioning accuracy, due to factors such as equipment wear and manufacturing tolerances of parts, the tooling with an integrated fixed structure is difficult to adjust flexibly, leading to a gradual decrease in positioning accuracy and affecting product quality. In terms of the ease of handling parts, the design of some tooling is limited, making it easy for parts to jam during handling, reducing production efficiency. This application proposes a solution to these problems: a machining pin-hole positioning tooling that uses a specific combination of circular and diamond-shaped pins and has a height-adjustable base plate. This tooling provides precise positioning when placing parts, and the handling of parts is less prone to jamming. Adjusting the height of the base plate via screws can compensate for machining errors, improve positioning accuracy, and adapt to various parts of different sizes, enhancing the tooling's versatility and reducing enterprise costs. Utility Model Content

[0009] To address the shortcomings of existing technologies, this utility model provides a pin hole positioning fixture for machining, which solves the problem that the integrated fixed structure of the fixture is difficult to adjust flexibly, resulting in a gradual decrease in positioning accuracy and affecting product quality. In terms of the convenience of picking up and putting down parts, the design of some fixtures is limited, making it easy for parts to get stuck during the picking and putting down process, thus reducing production efficiency.

[0010] To achieve the above objectives, this utility model provides the following technical solution:

[0011] A pin hole positioning fixture for machining includes a base plate, a support plate above the base plate, a support reference on the upper surface of the support plate, a workpiece on the upper surface of the support reference, a rhomboid positioning pin and a circular positioning pin movably sleeved inside the workpiece, two bolts movably engaging inside the base plate, and two hexagonal nuts threaded onto the annular sides of the two bolts, and two pin holes on the upper surface of the workpiece, which are respectively movably sleeved with the rhomboid positioning pin and the circular positioning pin.

[0012] Preferably, the support reference has two pairs of internal hexagon screws threaded onto its internal thread, and the upper surface of the support reference has two pairs of threaded holes, which are respectively threaded onto the two pairs of internal hexagon screws. The upper surface of the support plate has two pairs of threaded holes, which are respectively threaded onto the two pairs of internal hexagon screws.

[0013] Preferably, the upper surface of the support plate is provided with a rectangular groove, which is movably engaged with the support reference. Both bolts have a hexagonal nut threaded onto their annular sides, and both bolts are movably engaged with the support plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The diamond-shaped locating pin can restrict the rotation of the workpiece in the Y direction, while not contacting the inner wall of the pin hole in the X direction. This avoids secondary positioning in the X direction. By installing the circular locating pin and the diamond-shaped locating pin diagonally, both center positioning and workpiece rotation are achieved, ensuring positioning accuracy and meeting the needs of precision parts processing. This positioning method is suitable for processing precision parts such as automotive engine parts, ensuring accurate positioning when placing parts and preventing jamming when picking up or placing parts.

[0016] 2. Adjust the support plate to the required height by rotating the hexagonal nut two. After adjustment, re-fit the hexagonal nut two for limiting and fixing. The overall modular assembly can adjust the relative height between the workpiece and the tool according to the processing requirements. For example, when performing different processes such as milling and drilling, a reasonable workpiece height can allow the tool to perform at its best. Adjusting the height of the support plate by bolts and hexagonal nuts two improves the overall practicality, optimizes processing parameters, and improves processing efficiency and surface quality. Attached Figure Description

[0017] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0018] Figure 1 This is an overall structural diagram of the present invention;

[0019] Figure 2 This is an exploded view of the overall structure of this utility model;

[0020] Figure 3 This is a structural diagram of the supporting reference of this utility model;

[0021] Figure 4 This is a structural diagram of the support plate of this utility model.

[0022] Legend: 1. Base plate; 2. Support plate; 3. Support datum; 4. Workpiece; 5. Bolt; 6. Diamond locating pin; 7. Circular locating pin; 8. Pin hole; 9. Socket head screw; 10. Threaded hole one; 11. Rectangular groove; 12. Threaded hole two; 13. Hex nut one; 14. Hex nut two. Detailed Implementation

[0023] This application provides a pin hole positioning fixture for machining, which effectively solves the problems of the difficulty in flexibly adjusting integrated fixed structure fixtures, leading to a gradual decrease in positioning accuracy and affecting product quality. Furthermore, the design limitations of some fixtures in terms of part handling convenience cause parts to easily jam during handling, reducing production efficiency. This application designs a pin hole positioning fixture for machining that uses a specific combination of circular and diamond pins and has an adjustable base plate. This fixture provides precise positioning when placing parts, and the parts are less prone to jamming during handling. Adjusting the base plate height via screws can compensate for machining errors and improve positioning accuracy. It can also be adapted to various parts of different sizes, enhancing the fixture's versatility and reducing enterprise costs.

[0024] Example

[0025] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the technical solution in this application embodiment effectively solves the technical problems of the integrated fixed structure tooling being difficult to adjust flexibly, leading to a gradual decrease in positioning accuracy and affecting product quality. Furthermore, the design limitations of some tooling in terms of the ease of handling parts make it easy for parts to get stuck during handling, reducing production efficiency. The overall approach is as follows:

[0026] To address the problems existing in the prior art, this utility model provides a pin hole positioning fixture for machining, including a base plate 1, a support plate 2 above the base plate 1, a support reference 3 on the upper surface of the support plate 2, a workpiece 4 on the upper surface of the support reference 3, a rhomboid positioning pin 6 and a circular positioning pin 7 movably sleeved inside the workpiece 4, two bolts 5 movably engaging inside the base plate 1, and two hexagonal nuts 14 threaded onto the annular sides of the two bolts 5, and two pin holes 8 formed on the upper surface of the workpiece 4, which movably engage with the rhomboid positioning pin 6 and the circular positioning pin 7 respectively. The main function of the circular positioning pin 7 is to determine the center. When placing the workpiece 4, the workpiece 4 is initially positioned with the circular positioning pin 7 as the center. When the workpiece 4 is placed on the support reference 3, the workpiece 4 is positioned further. After positioning 3, the workpiece 4 will tend to rotate around the circular locating pin 7. This movement needs to be restricted. Since the rotation of the workpiece 4 around the circular locating pin 7 will affect the positioning accuracy, a rhomboid locating pin 6 is added. Its function is to stop rotation. It can restrict the rotation of the workpiece 4 in the Y direction, and at the same time, it does not contact the inner wall of the pin hole 8 in the X direction. This can avoid secondary positioning in the X direction. By installing the circular locating pin 7 and the rhomboid locating pin 6 diagonally, both center positioning and the rotation of the workpiece 4 are achieved, ensuring the positioning accuracy and meeting the needs of precision parts processing. This positioning method is suitable for processing precision parts such as automotive engine parts, and can ensure accurate positioning when placing parts, and the picking and placing of parts is not easy to get stuck.

[0027] The support reference 3 has two pairs of internal hexagonal screws 9 threaded into its internal threads. The upper surface of the support reference 3 has two pairs of threaded holes 10, which are threaded into the two pairs of internal hexagonal screws 9 respectively. The upper surface of the support plate 2 has two pairs of threaded holes 12, which are threaded into the two pairs of internal hexagonal screws 9 respectively. The upper surface of the support plate 2 has a rectangular groove 11, which is movably engaged with the support reference 3. Both bolts 5 have hexagonal nuts 13 threaded into their annular sides. Both bolts 5 are movably engaged with the support plate 2. During use, the two bolts 5 are engaged in the grooves on the lower surface of the base plate 1, at which point the hexagonal nuts 13 are threaded into the bolts 5 and engaged with the base plate. 1. The upper surfaces are fitted together to fix the two in a limited position. Then, hexagonal nuts 2 and 14 are fitted onto the surface of bolt 5 again, and the support plate 2 is connected to the two bolts 5. At this time, the support plate 2 is adjusted to the required height by rotating hexagonal nuts 2 and 14 as needed. After adjustment, hexagonal nuts 2 and 14 are fitted again for fixed positioning. The overall modular assembly can adjust the relative height between the workpiece 4 and the tool according to the processing requirements. For example, when performing different processes such as milling and drilling, a reasonable height of workpiece 4 can allow the tool to perform at its best. Adjusting the height of the support plate 2 by bolts 5 and hexagonal nuts 2 and 14 improves the overall practicality, optimizes processing parameters, and improves processing efficiency and surface quality.

[0028] Among them, the base plate 1 serves as the basic support component of the tooling, providing an installation platform for the support plate 2, etc., and in conjunction with the bolts 5, it can realize the adjustment of the tooling height, playing a supporting and height adjustment foundation role in the entire tooling.

[0029] Support plate 2: Connects base plate 1 and support reference 3. The height is adjusted by bolts 5 and hex nuts (hex nut 13 and hex nut 24), thereby adjusting the relative height between workpiece 4 and tool and optimizing the machining process. It is a key component for height adjustment and connection.

[0030] Support reference 3: It supports the workpiece 4 and is connected and fixed to the support plate 2 by the internal hex screw 9 to ensure the stability of the workpiece 4 during processing and provide stable support for the processing of the workpiece 4;

[0031] Workpiece 4: This is the object to be processed. It is precisely positioned by the cooperation of pin hole 8 and positioning pin (diamond positioning pin 6 and round positioning pin 7). The processing steps are completed on the support datum 3. It is the core processing target of the tooling service.

[0032] Bolt 5: Connects to base plate 1 and support plate 2, and works with hexagonal nuts (hexagonal nut 13 and hexagonal nut 24) to adjust the height of support plate 2 to meet different processing requirements. It is a key connecting component for height adjustment.

[0033] Rhomboid locating pin 6: works with circular locating pin 7 to restrict the rotation of workpiece 4 in the Y direction, avoid secondary positioning in the X direction, ensure positioning accuracy, and work together with circular locating pin 7 to ensure positioning accuracy;

[0034] Circular locating pin 7: Determines the center position of workpiece 4, enabling initial positioning of workpiece 4. It works in conjunction with rhomboid locating pin 6 to ensure positioning accuracy and is a key component for the initial positioning of workpiece 4.

[0035] Pin hole 8: It is formed on workpiece 4 and is movably connected with diamond locating pin 6 and circular locating pin 7 to achieve precise positioning of workpiece 4. It is an important structure for achieving precise positioning of workpiece 4.

[0036] Hex socket screw 9: Used to connect the support reference 3 and the support plate 2, so as to fix the two and ensure the stability of the tooling structure. It is a fastening component connecting the support reference 3 and the support plate 2.

[0037] Threaded hole 10: Located on the support base 3, it is threadedly connected to the internal hex screw 9 to achieve a stable installation of the support base 3 and the support plate 2, and to provide a connection base for the internal hex screw 9;

[0038] Rectangular groove 11: It is formed on the support plate 2 and is movably engaged with the support reference 3 to assist in positioning and installing the support reference 3, enhance connection stability, and assist in the installation and positioning of the support reference 3;

[0039] Threaded hole 212: On the support plate 2, it cooperates with the internal hex screw 9 to firmly install the support reference 3 on the support plate 2, and together with the internal hex screw 9, it ensures that the support reference 3 is firmly installed.

[0040] Hex nut 13: It works with bolt 5 to limit and fix bolt 5 and base plate 1, ensuring the stability of the tooling structure and playing a preliminary limiting and fixing role.

[0041] Hex nut 214: Used with bolt 5 to adjust the height of support plate 2. After adjustment, fix it again to ensure stable height position. It is a key component for fixing after height adjustment.

[0042] Working principle:

[0043] The main function of the circular locating pin 7 is to center the workpiece. When placing the workpiece 4, it is initially positioned around the circular locating pin 7. After the workpiece 4 is placed on the support reference 3, it tends to rotate around the circular locating pin 7, which requires subsequent restriction. Since the rotation of the workpiece 4 around the circular locating pin 7 will affect the positioning accuracy, a rhomboid locating pin 6 is added. Its function is to stop rotation. It can restrict the rotation of the workpiece 4 in the Y direction, and at the same time, it does not contact the inner wall of the pin hole 8 in the X direction, thus avoiding secondary positioning in the X direction. By installing the circular locating pin 7 and the rhomboid locating pin 6 diagonally, both center positioning and restriction of the rotation of the workpiece 4 are achieved, ensuring positioning accuracy and meeting the needs of precision parts processing. This positioning method is suitable for processing precision parts such as automotive engine parts, ensuring accurate positioning when placing parts and facilitating the picking and placing of zeros. The components are not prone to jamming. During use, the two bolts 5 are engaged in the grooves on the lower surface of the base plate 1. At this time, hexagonal nuts 13 are threaded onto the surface of the bolts 5 and fit against the upper surface of the base plate 1, so that the two are in a limited and fixed state. Then, hexagonal nuts 24 are threaded onto the surface of the bolts 5, and the support plate 2 is connected to the two bolts 5. At this time, the support plate 2 is adjusted to the required height by rotating hexagonal nuts 214 as needed. After adjustment, hexagonal nuts 214 are threaded onto the support plate 2 again for limited and fixed position. The overall modular assembly can adjust the relative height between the workpiece 4 and the tool according to the processing requirements. For example, when performing different processes such as milling and drilling, a reasonable height of the workpiece 4 can allow the tool to perform at its best. By adjusting the height of the support plate 2 through the bolts 5 and hexagonal nuts 214, the overall practicality is improved, the processing parameters are optimized, and the processing efficiency and surface quality are improved.

[0044] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A pin hole positioning fixture for machining, comprising a base plate (1), characterized in that, A support plate (2) is provided above the base plate (1), a support reference (3) is provided on the upper surface of the support plate (2), a workpiece (4) is provided on the upper surface of the support reference (3), and a rhomboid positioning pin (6) and a circular positioning pin (7) are movably sleeved inside the workpiece (4). The base plate (1) has two bolts (5) that are movably engaged inside it, and the two bolts (5) are threaded with two hexagonal nuts (14) on their annular sides.

2. The pin hole positioning fixture for machining as described in claim 1, characterized in that: Two pin holes (8) are opened on the upper surface of the workpiece (4); The two pin holes (8) are respectively movably connected to the rhomboid positioning pin (6) and the circular positioning pin (7).

3. The pin hole positioning fixture for machining as described in claim 1, characterized in that: The support reference (3) is threaded with two pairs of internal hexagonal screws (9).

4. The pin hole positioning fixture for machining as described in claim 3, characterized in that: The upper surface of the support reference (3) is provided with two pairs of threaded holes (10); Among them, the two pairs of threaded holes (10) are respectively threaded into the two pairs of internal hexagon screws (9).

5. The pin hole positioning fixture for machining as described in claim 4, characterized in that: The upper surface of the support plate (2) is provided with two pairs of threaded holes (12); Among them, the two pairs of threaded holes (12) are respectively threaded into two pairs of internal hexagon screws (9).

6. The pin hole positioning fixture for machining as described in claim 1, characterized in that: A rectangular groove (11) is provided on the upper surface of the support plate (2); The rectangular groove (11) is movably engaged with the support reference (3).

7. The pin hole positioning fixture for machining as described in claim 1, characterized in that: Both bolts (5) have a hexagonal nut (13) threaded onto their annular sides.

8. The pin hole positioning fixture for machining as described in claim 1, characterized in that: Both bolts (5) are movably connected to the support plate (2).

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