Positioning jig for CNC machining center

Abstract

The utility model provides a positioning jig for a CNC (computerized numerical control) machining center, which is used for positioning a workpiece and comprises a positioning base, a positioning plate and a positioning plate. The pressing plate is arranged above the positioning base; the positioning component is connected with the pressing plate and the positioning base, so that a containing space is formed between the pressing plate and the positioning base, the containing space is suitable for containing a workpiece, the top face of the workpiece abuts against the pressing plate, and the bottom face of the workpiece abuts against the positioning base. The workpiece is placed on the positioning base, then the pressing plate is matched with the positioning base, the positioning component penetrates through the pressing plate and is connected to the positioning base, and therefore the workpiece is positioned on the positioning base, positioning of the workpiece is accurate, deformation is not prone to occurring, and the operation efficiency and production quality of equipment can be guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of tooling technology, specifically relating to a positioning fixture for a CNC machining center. Background Technology

[0002] In order to ensure the precision tolerance of precision parts during machining, and to make them suitable for mass production and ensure product consistency, etc.

[0003] In related technologies, to prevent tool bounce and vibration during the machining of thin-walled parts, the currently used tooling is inaccurate in positioning and prone to deformation, which cannot guarantee equipment operating efficiency and production quality. Utility Model Content

[0004] In view of this, the present invention provides a positioning fixture for CNC machining centers to solve the problems existing in the prior art.

[0005] This utility model provides a positioning fixture for a CNC machining center, used for positioning a workpiece. The positioning fixture for a CNC machining center includes: a positioning base; a pressure plate disposed above the positioning base; and a positioning component connecting the pressure plate and the positioning base, such that an accommodating space is formed between the pressure plate and the positioning base, the accommodating space being suitable for accommodating the workpiece, and the top surface of the workpiece abutting against the pressure plate, and the bottom surface of the workpiece abutting against the positioning base.

[0006] In one optional embodiment, the positioning component includes a positioning pin, a first positioning hole, and a second positioning hole, wherein the first positioning hole is disposed on the positioning base and the second positioning hole is disposed on the pressure plate.

[0007] In one optional embodiment, the second positioning hole is an elongated hole, and the length extension direction of the elongated hole is consistent with the length direction of the pressure plate.

[0008] In one alternative implementation, the first positioning hole is a blind hole.

[0009] In one alternative embodiment, the locating pin includes a screw and a nut, the nut being positioned above the pressure plate to lock the pressure plate.

[0010] In one alternative embodiment, the positioning base is circular in shape.

[0011] In one alternative embodiment, the pressure plates are configured as a plurality of plates, which are evenly distributed in the circumferential direction.

[0012] In one alternative embodiment, the pressure plate is a strip plate with a flat end at one end along its length, the flat end being adapted to press down on the workpiece.

[0013] In one alternative implementation, four pressure plates are provided.

[0014] In one optional embodiment, the positioning base is provided with two zero-point positioning holes, which are arranged diagonally. A pin is provided in the zero-point positioning hole, and the pin passes through the workpiece.

[0015] The beneficial effects of this utility model are as follows: by placing the workpiece on the positioning base, and then cooperating with the positioning base through the pressure plate, and by passing the positioning component through the pressure plate and connecting it to the positioning base, the workpiece is positioned on the positioning base. The positioning of the workpiece is accurate and not easily deformed, which can ensure the operating efficiency of the equipment and the production quality. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a positioning fixture for a CNC machining center according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the arrangement of the pressure plates of a positioning fixture for a CNC machining center according to an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Positioning base; 11. First positioning hole; 2. Pressure plate; 21. Second positioning hole; 3. Workpiece. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0025] The following is combined with Figure 1 and Figure 2 The following describes embodiments of the present invention.

[0026] like Figure 1 As shown, according to an embodiment of the utility model, a positioning fixture for a CNC machining center is provided for positioning a workpiece 3. The positioning fixture for a CNC machining center includes: a positioning base 1; a pressure plate 2 disposed above the positioning base 1; and a positioning component connecting the pressure plate 2 and the positioning base 1, such that a receiving space is formed between the pressure plate 2 and the positioning base 1, the receiving space being suitable for receiving the workpiece 3, and the top surface of the workpiece 3 abutting against the pressure plate 2, and the bottom surface of the workpiece 3 abutting against the positioning base 1.

[0027] In this embodiment, the positioning fixture for the CNC machining center mainly includes a positioning base 1, a pressure plate 2, and positioning components. The positioning base 1 is made of high-strength metal material, possessing high stability and rigidity, and can provide a stable support platform for the workpiece 3, ensuring that the workpiece 3 will not shift or shake during machining. The surface of the positioning base 1 is precision machined, with high flatness, and can fit tightly against the bottom surface of the workpiece 3, thereby ensuring the positioning accuracy of the workpiece 3.

[0028] The pressure plate 2 is positioned above the positioning base 1, and applies pressure to firmly fix the workpiece 3 onto the positioning base 1. The pressure plate 2 can be made of the same metal material as the positioning base 1 to ensure its strength and durability.

[0029] The positioning component connects the pressure plate 2 and the positioning base 1. It not only supports the pressure plate 2 but also creates a receiving space between them. The size and shape of this space match the dimensions of the workpiece 3, allowing for precise placement. When the workpiece 3 is placed within this space, its top surface is in close contact with the pressure plate 2, and its bottom surface is in close contact with the positioning base 1, thus achieving precise positioning and clamping of the workpiece 3. The design of the positioning component typically needs to consider the shape and size of the workpiece 3, as well as the stress conditions during processing, to ensure that the workpiece 3 maintains a stable position throughout the processing.

[0030] In practical use, the pressure plate 2 can be connected to the positioning base 1 by bolts, nuts or other fasteners, and the pressure on the workpiece 3 can be controlled by adjusting the tightness of the fasteners.

[0031] The positioning fixture used in CNC machining centers can effectively solve the positioning and fixing problem of workpiece 3 during the machining process, improve machining accuracy and efficiency, and reduce machining errors and scrap rate caused by loosening or displacement of workpiece 3.

[0032] Furthermore, such as Figure 1 and Figure 2 As shown, the positioning component includes a positioning pin (not shown in the figure), a first positioning hole 11 and a second positioning hole 21. The first positioning hole 11 is provided on the positioning base 1 and the second positioning hole 21 is provided on the pressure plate 2.

[0033] The first positioning hole 11 is provided on the positioning base 1. The size and shape of the first positioning hole 11 match the positioning pin. It is usually a round hole with a diameter slightly larger than that of the positioning pin so that the positioning pin can be inserted smoothly. When the positioning pin is inserted into the first positioning hole 11, the bottom of the workpiece 3 fits tightly against the positioning base 1, thereby achieving precise positioning of the workpiece 3 in the horizontal direction.

[0034] The second positioning hole 21 is provided on the pressure plate 2, corresponding to the first positioning hole 11. The size and shape of the second positioning hole 21 are also matched with the positioning pin, and its diameter and position are precisely designed to ensure that the positioning pin can be inserted into both the first positioning hole 11 and the second positioning hole 21 simultaneously. When the positioning pin is inserted into the second positioning hole 21, the pressure plate 2 fits tightly against the top of the workpiece 3, thereby achieving precise positioning and clamping of the workpiece 3 in the vertical direction.

[0035] Workpiece 3 is first placed on positioning base 1, with its bottom surface tightly fitted to the base 1. Then, positioning pins are inserted sequentially into the second positioning hole 21 and the first positioning hole 11. Guided by the positioning pins, pressure plate 2 is precisely pressed onto the top surface of workpiece 3, thus firmly fixing workpiece 3 between positioning base 1 and pressure plate 2. Due to the precise fit of the positioning pins, the first positioning hole 11, and the second positioning hole 21, workpiece 3 maintains a stable position throughout the machining process, avoiding displacement caused by vibration or cutting forces, thereby ensuring machining accuracy and quality.

[0036] The second positioning hole 21 is an elongated hole, with its length extending in the same direction as the pressure plate 2. This elongated design allows the positioning pin a certain range of motion within the hole, unlike traditional circular positioning holes which are fixed at a single point. By adjusting the position of the positioning pin within the elongated hole, the workpiece 3 can be positioned quickly, significantly improving processing efficiency. The workpiece 3 can be fine-tuned along the direction of the pressure plate 2 during placement, better accommodating dimensional tolerances and shape deviations. This is particularly suitable for processing workpieces with a wide range of dimensions, effectively reducing positioning errors caused by inconsistent workpiece dimensions.

[0037] The first positioning hole 11 is a blind hole. As a blind hole, it extends downwards from the surface of the positioning base 1 but does not penetrate the entire positioning base 1. This design creates a closed end face at the bottom of the positioning hole. Compared to a through hole, a blind hole is structurally more compact and better protects the positioning pin from external influences. The bottom of the blind hole provides a clear stop surface for the positioning pin, allowing it to reach the predetermined position more accurately during insertion, reducing the pin's floating in the depth direction, and thus improving the positioning accuracy of the workpiece 3.

[0038] The locating pin includes a screw and a nut, with the nut positioned above the pressure plate 2 to lock it in place. One end of the screw is inserted into the first locating hole 11, and the other end passes through the pressure plate 2 from the second locating hole 21 and is locked in place by the nut. The outer wall of the locating pin is tightly fitted with the inner walls of the first locating hole 11 and the second locating hole 21.

[0039] The positioning base 1 is circular in shape. The circular base allows the workpiece 3 to bear the cutting forces from all directions evenly during the machining process.

[0040] Furthermore, multiple pressure plates 2 are provided, and these multiple pressure plates 2 are evenly distributed in the circumferential direction. The even distribution of multiple pressure plates 2 along the circumference of the positioning base 1 can ensure that uniform pressure is applied to the workpiece 3 from different directions. For example, if the positioning base 1 is circular, the pressure plates 2 can be evenly distributed at intervals of 90 degrees or 120 degrees, thereby forming a stable fixed structure.

[0041] The pressure plate 2 is a strip-shaped plate with a flat end along its length, which is suitable for pressing down on the workpiece 3. The flat end allows for easy adjustment of the angle of the pressure plate 2 according to the shape of the workpiece 3 to achieve the best fixing effect.

[0042] Four pressure plates 2 are configured. These four pressure plates 2 are evenly distributed along the circumference of the positioning base 1, forming a stable fixing structure. This allows each pressure plate 2 to apply uniform pressure to the workpiece 3 from different directions, thereby ensuring that the workpiece 3 maintains a stable position during processing. For example, if the positioning base 1 is circular, the four pressure plates 2 can be evenly distributed at 90-degree intervals, forming a cross-shaped fixing structure. This layout minimizes the shaking of the workpiece 3 during processing.

[0043] Furthermore, the positioning base 1 is provided with two zero-point positioning holes, which are arranged diagonally. A pin is installed within each zero-point positioning hole, through which the workpiece 3 passes. The diagonal arrangement of the two zero-point positioning holes ensures that the workpiece 3 receives stable support from two opposite directions during positioning, thereby reducing wobbling or displacement of the workpiece 3 during processing. The diagonal arrangement of the zero-point positioning holes ensures that the workpiece 3 maintains a stable position in both the horizontal and vertical directions, making it particularly suitable for processing workpieces 3 with complex shapes or large dimensions. The pin is inserted into the zero-point positioning hole, passes through the workpiece 3, and firmly fixes the workpiece 3 to the positioning base 1. Because the zero-point positioning holes are diagonally arranged, the pin can apply a uniform fixing force to the workpiece 3 from two opposite directions, thus ensuring that the workpiece 3 maintains a stable position during processing.

[0044] This fixture provides extremely fast positioning, reducing human error during batch clamping and acting as a mistake-proofing mechanism. It also improves operator safety, equipment efficiency, production quality, and the safe processing of parts, thus enhancing product quality. Repeatable positioning eliminates the need for manual clamping and data retrieval, reducing costs.

[0045] This fixture significantly reduces the risk of parts deforming or exceeding tolerances during machining, greatly reducing the workload of repeatedly taking and positioning each part, and enabling rapid clamping and positioning. The locating pin design facilitates assembly and positioning, ensuring the accuracy and consistency of batch processing clamping, making products more closely match design requirements. Furthermore, it is easy to operate and highly practical, thereby improving work efficiency.

[0046] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation.

[0047] For those skilled in the art, various variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom remain within the protection scope of this invention.

Claims

1. A positioning fixture for a CNC machining center, used for positioning a workpiece, characterized in that, Positioning fixtures for CNC machining centers include: Positioning base; A pressure plate is positioned above the positioning base; A positioning component connects the pressure plate and the positioning base, thereby forming an accommodating space between the pressure plate and the positioning base. The accommodating space is suitable for accommodating the workpiece, and the top surface of the workpiece abuts against the pressure plate, while the bottom surface of the workpiece abuts against the positioning base.

2. The positioning fixture for a CNC machining center according to claim 1, characterized in that, The positioning component includes a positioning pin, a first positioning hole, and a second positioning hole. The first positioning hole is located on the positioning base, and the second positioning hole is located on the pressure plate.

3. The positioning fixture for a CNC machining center according to claim 2, characterized in that, The second positioning hole is an elongated hole, and the length of the elongated hole extends in the same direction as the length of the pressure plate.

4. The positioning fixture for a CNC machining center according to claim 2, characterized in that, The first positioning hole is a blind hole.

5. The positioning fixture for a CNC machining center according to claim 2, characterized in that, The locating pin includes a screw and a nut, with the nut positioned above the pressure plate to lock the pressure plate in place.

6. The positioning fixture for a CNC machining center according to any one of claims 1 to 5, characterized in that, The positioning base is circular in shape.

7. The positioning fixture for a CNC machining center according to any one of claims 1 to 5, characterized in that, The pressure plate is configured as a plurality of plates, which are evenly distributed in the circumferential direction.

8. The positioning fixture for a CNC machining center according to claim 7, characterized in that, The pressure plate is a strip plate, and one end of the pressure plate in the length direction is a flat end, which is suitable for pressing the workpiece.

9. The positioning fixture for a CNC machining center according to claim 7, characterized in that, The pressure plates are configured to be four.

10. The positioning fixture for a CNC machining center according to any one of claims 1 to 5, characterized in that, The positioning base is provided with two zero-point positioning holes, which are arranged diagonally. A pin is provided in the zero-point positioning hole, and the pin passes through the workpiece.

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