A four-axis milling machine fixture for rapid positioning

Abstract

The application provides a four-axis milling machine clamp with rapid positioning, comprising a clamp body connected with a four-axis machine dividing disc through a connecting bolt, a positioning bolt threadedly connected with the axis of the clamp body, a sliding block with an inclined outer side surface, a plurality of positioning blocks installed between the sliding block and the mounting hole, an end surface of the positioning block adjacent to the sliding ring being an inclined surface, the inclined surface of the positioning block being in close contact with the inclined surface of the sliding ring, an end surface of the positioning block adjacent to the mounting hole being an arc surface, and the arc surface abutting against the inner side of the mounting hole. The application has the beneficial effect that the positioning bolt is tightened, the sliding block moves to the rotating ejector pin direction, the arc surface of the positioning block driven by the sliding block abuts against the inner side wall of the mounting hole, the tool body is coaxial with the four-axis machine dividing disc, then the connecting bolt is tightened to fix the tool body, the concentricity of the tool body and the four-axis machine dividing disc is ensured, the machining precision of the part is ensured, and the tool body is suitable for different types of four-axis dividing discs.

Description

Technical Field

[0001] This invention belongs to the field of machining technology, and in particular relates to a four-axis milling machine fixture for rapid positioning. Background Technology

[0002] The parts processed by four-axis machining centers mostly rotate around the X-axis. Current four-axis machine tools are equipped with three-jaw chucks for clamping on the indexing plate. After long-term use, the three-jaw chuck will develop axial deviation. After repeated disassembly and reassembly of the chuck, the wear clearance of the centering flange mating surface will increase, which will also affect the centering accuracy of the three-jaw chuck. If the centering of the three-jaw chuck is problematic, the four-axis workpiece mounting and circle alignment will be a very troublesome task. Often, the workpiece mounting time is longer than the machining time.

[0003] The three-jaw chuck clamping method is not suitable for the installation of high-precision batch parts. The current solution is to use a four-axis machine tool flange as a fixture. However, this type of fixture has the following problems: First, for more accurate centering and mating, the gap between the four-axis indexing plate and the fixture needs to be kept within 0.02 mm. The existing fixtures often cannot meet the accuracy requirements, resulting in the fixture axis not coinciding with the axis of the four-axis indexing plate, which in turn leads to the part's machining accuracy not meeting the requirements. Second, different machine tool models and manufacturers have different diameters of the indexing plate's mounting holes, requiring different fixtures to be made according to the diameter of the indexing plate's mounting holes, which is costly and inconvenient to store. Third, rotating the ejector pin during use can damage the main body of the tooling. Summary of the Invention

[0004] In view of this, the present invention aims to provide a fast positioning four-axis milling machine fixture in order to solve at least one of the above-mentioned technical problems.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] A rapid positioning four-axis milling machine fixture, comprising:

[0007] The fixture body is connected to the indexing plate of the four-axis machine tool by connecting bolts;

[0008] A positioning bolt is threaded to the axis of the fixture body and is installed inside the mounting hole of the indexing plate of the four-axis machine tool.

[0009] A slider, wherein a through hole is opened at the axis of the slider, the positioning bolt passes through the through hole, and the outer surface of the slider is an inclined surface;

[0010] Positioning blocks; there are multiple positioning blocks, all of which are installed between the slider and the mounting hole. The end face of the positioning block near the slider is an inclined surface, and the inclined surface of the positioning block is in contact with the inclined surface of the slider. The end face of the positioning block near the mounting hole is an arc-shaped surface, and the arc-shaped surface is pressed against the inner side of the mounting hole.

[0011] Furthermore, the slider is a square block with a through hole extending through both end faces. All four sides of the square block are inclined surfaces, and a positioning block is provided between each of the four sides of the slider and the mounting hole.

[0012] Furthermore, the indexing plate of the four-axis machine tool has multiple T-slots, the length direction of which is perpendicular to the axis of the indexing plate. Each T-slot contains a T-block, and the fixture body has a circular hole corresponding to the T-slot. The connecting bolt passes through the circular hole and is threaded to the T-block.

[0013] Furthermore, a T-shaped guide groove corresponding to the positioning block is opened on the end face of the fixture body near the positioning block. The length direction of the T-shaped guide groove is set along the moving direction of the positioning block. A T-shaped guide part matching the T-shaped guide groove is fixed at one end of the positioning block near the fixture body. The T-shaped guide part is installed inside the T-shaped guide groove.

[0014] A square guide post is fixed at one end of the positioning block near the fixture body. A square guide groove matching the square guide post is opened on the end face of the fixture body near the positioning block. The square guide post is installed inside the square guide groove.

[0015] Furthermore, the fixture body includes a flange, a first inspection plate, a square column, and a second inspection plate connected in sequence. The flange is connected to the indexing plate of the four-axis machine tool by connecting bolts. The first inspection plate is a circular disc, and the first inspection plate is coaxial with the square column.

[0016] The second detection disk is a circular disk, and the second detection disk is arranged coaxially with the square column.

[0017] Furthermore, the fixture body is provided with a pin hole protective sleeve at one end away from the indexing plate of the four-axis machine tool, and a tapered tightening hole is opened at one end of the pin hole protective sleeve near the pin, and the tapered tightening hole is coaxially arranged with the fixture body;

[0018] The fixture body has scale markings on the end face away from the indexing plate of the four-axis machine tool.

[0019] Furthermore, the ejector pin hole protective sleeve is a conical structural component, and the fixture body has a conical groove that matches the ejector pin hole protective sleeve, with the ejector pin hole protective sleeve installed on the inner side of the conical groove;

[0020] The protective sleeve for the ejector pin hole has a disassembly threaded hole.

[0021] Furthermore, the sides of the square column are provided with tooling plates, which are detachably connected to the square column by mounting bolts.

[0022] Two positioning posts are fixed on the side of the square column, and positioning holes matching the positioning posts are opened on the tooling plate, with the positioning posts located inside the positioning holes.

[0023] The tooling plate is equipped with clamping plates for clamping the workpiece to be processed.

[0024] Furthermore, the tooling plate has multiple pry grooves on the edge of the end face near the square column.

[0025] Furthermore, the tooling plate has multiple connecting holes, and the square column has threaded holes corresponding to the connecting holes. The mounting bolt passes through the connecting holes and is threadedly connected to the square column.

[0026] The multiple connection holes are arranged asymmetrically.

[0027] Compared with the prior art, the four-axis milling machine fixture for rapid positioning described in this invention has the following advantages:

[0028] (1) The four-axis milling machine fixture for quick positioning described in this invention, when the positioning bolts are tightened, the slider moves in the direction of rotating the ejector pin. Under the action of the inclined surface of the slider and the inclined surface of the positioning block, the arc-shaped surface of multiple positioning blocks presses against the inner side wall of the mounting hole, which plays a positioning role. At this time, the fixture body is coaxial with the indexing plate of the four-axis machine tool. Then, the connecting bolts are tightened to fix the fixture body, which ensures the concentricity of the fixture body and the indexing plate of the four-axis machine tool, thereby ensuring the machining accuracy of the parts. The operation process is simple and it is suitable for different models of four-axis indexing plates.

[0029] (2) The four-axis milling machine fixture for rapid positioning described in this invention has a pin hole protective sleeve at the end of the fixture body away from the indexing plate of the four-axis machine tool. A tapered tightening hole is opened at the end of the pin hole protective sleeve near the pin. The tapered tightening hole is coaxially arranged with the fixture body. The tapered structure can effectively avoid the problem of misalignment after installation and improve the positioning accuracy. The use of the pin hole protective sleeve can effectively avoid damage to the fixture body after long-term use. After the protective sleeve is worn, a new protective sleeve can be directly replaced.

[0030] (3) The four-axis milling machine fixture for rapid positioning described in this invention adopts a replaceable tooling plate installation method, which enables the design of corresponding tooling plates for various products according to their shape and structural characteristics, and achieves rapid positioning, installation and replacement according to standardized hole positions and positioning pin holes, thereby reducing tooling manufacturing costs and enabling a single fixture body to process multiple products at the same time. Attached Figure Description

[0031] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0032] Figure 1 This is a schematic diagram of the three-dimensional structure of the clamp described in an embodiment of the present invention;

[0033] Figure 2 This is a first-view three-dimensional structural diagram of the clamp body according to an embodiment of the present invention;

[0034] Figure 3 This is a second-view three-dimensional structural diagram of the clamp body according to an embodiment of the present invention;

[0035] Figure 4 This is a three-dimensional schematic diagram of the tooling plate described in an embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the three-dimensional structure of the positioning block according to an embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the three-dimensional structure of the slider according to an embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram of the cross-sectional structure of the fixture described in an embodiment of the present invention;

[0039] Figure 8 As described in the embodiments of the present invention Figure 7 Schematic diagram of the structure at point A in the middle;

[0040] Figure 9 As described in the embodiments of the present invention Figure 7 Schematic diagram of the structure at point B.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Four-axis machine tool indexing plate; 2. Rotating ejector pin; 3. Fixture body; 4. Tooling plate; 5. Clamping plate; 6. Positioning block; 7. Slider; 8. Worktable; 9. Positioning bolt; 10. Connecting bolt; 11. T-block; 12. Ejector pin hole protective sleeve; 101. T-slot; 301. Flange; 302. Inspection plate one; 303. Square column; 304. Inspection plate two; 305. Positioning column; 30101. Round hole; 30102. T-shaped guide groove; 30103. Square guide groove; 401. Positioning hole; 402. Pry groove; 403. Connecting hole; 601. T-shaped guide part; 701. Square guide column; 702. Through hole; 1201. Disassembly threaded hole. Detailed Implementation

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0044] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention 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 the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0047] Figures 1 to 9 As shown, a rapid positioning four-axis milling machine fixture includes:

[0048] The fixture body 3 is connected to the indexing plate 1 of the four-axis machine tool via connecting bolts 10;

[0049] The positioning bolt 9 is threaded to the axis of the fixture body 3 and is installed inside the mounting hole of the four-axis machine tool indexing plate 1. The mounting hole is coaxial with the four-axis machine tool indexing plate 1.

[0050] Slider 7 has a through hole 702 at its axis, through which the positioning bolt 9 passes. The outer surface of slider 7 is inclined (e.g., Figure 5 (e-face in the middle); the diameter of the through hole 702 matches the diameter of the positioning bolt 9.

[0051] Positioning block 6; there are multiple positioning blocks 6, all of which are installed between the slider 7 and the mounting hole. The end face of the positioning block 6 adjacent to the slider is an inclined surface (e.g., Figure 5 (D-side of the slider), the inclined surface of the positioning block 6 is in contact with the inclined surface of the slider, and the end face of the positioning block 6 near the mounting hole is an arc-shaped surface (e.g., ...). Figure 5 (C-side), the arc-shaped surface is pressed against the inside of the mounting hole.

[0052] The slider 7 is a square block with a through hole 702 on the top of the block that passes through both end faces. All four sides of the square block are inclined surfaces. A positioning block 6 is provided between each of the four sides of the slider 7 and the mounting hole.

[0053] The indexing plate 1 of the four-axis machine tool has multiple T-slots 101. The length direction of the T-slots 101 is perpendicular to the axis of the indexing plate 1 of the four-axis machine tool. Each T-slot 101 is provided with a T-block 11. The fixture body 3 has a circular hole 30101 corresponding to the T-slot 101. The connecting bolt 10 passes through the circular hole 30101 and is threaded to the T-block 11.

[0054] A T-shaped guide groove 30102 corresponding to the positioning block 6 is formed on the end face of the fixture body 3 near the positioning block 6. The length direction of the T-shaped guide groove 30102 is set along the moving direction of the positioning block 6. A T-shaped guide part 601 matching the T-shaped guide groove 30102 is fixed at one end of the positioning block 6 near the fixture body 3. The T-shaped guide part 601 is installed inside the T-shaped guide groove 30102. The T-shaped guide groove 30102 not only limits the T-shaped guide part 601, but also guides the positioning block 6 during its movement.

[0055] A square guide post 701 is fixedly provided at one end of the positioning block 6 near the fixture body 3. A square guide groove 30103 matching the square guide post 701 is opened on the end face of the fixture body 3 near the positioning block 6. The square guide post 701 is installed inside the square guide groove 30103. The square guide groove 30103 not only plays a guiding role in the movement of the square guide post 701, but also prevents the square guide post 701 from rotating.

[0056] The fixture body 3 includes a flange 301, a first inspection plate 302, a square column 303, and a second inspection plate 304 connected in sequence. The flange 301 is connected to the indexing plate 1 of the four-axis machine tool by connecting bolts 10. The first inspection plate 302 is a disc and is coaxially arranged with the square column 303.

[0057] The second detection disc 304 is a circular disc, and the second detection disc 304 is set coaxially with the square column 303. The dial indicator checks the circular runout of the main body of the tooling on the first detection disc 302 and the second detection disc 304. The clamping plate 5 is located between the first detection disc 302 and the second detection disc 304, which improves the accuracy of the circular runout detection.

[0058] The fixture body 3 is provided with a pin hole protective sleeve 12 at the end away from the indexing plate 1 of the four-axis machine tool. The pin hole protective sleeve 12 has a tapered tightening hole at the end near the pin. The tapered tightening hole is set on the same axis as the fixture body 3. Using the pin hole protective sleeve 12 can effectively avoid damage to the fixture body after long-term use. After the protective sleeve is worn, it can be directly replaced with a new protective sleeve.

[0059] The end face of the fixture body 3 away from the indexing plate 1 of the four-axis machine tool is provided with scale markings, which make it easy to observe the rotation angle of the indexing plate 1 of the four-axis machine tool.

[0060] The ejector pin hole protective sleeve 12 is a conical structure. The fixture body 3 has a conical groove that matches the ejector pin hole protective sleeve 12. The ejector pin hole protective sleeve 12 is installed on the inner side of the conical groove, and the rotating ejector pin 2 is installed on the inner side of the conical tightening hole. The rotating ejector pin 2 and the four-axis machine tool indexing plate 1 are coaxially arranged and are rotatably connected to the worktable 8.

[0061] The ejector pin hole protective sleeve 12 has a disassembly threaded hole 1201, which facilitates the insertion of bolts to disassemble the ejector pin hole protective sleeve 12.

[0062] The sides of the square column 303 are provided with tooling plates 4, which are detachably connected to the square column 303 by mounting bolts.

[0063] Two positioning posts 305 are fixed on the side of the square post 303. The tooling plate 4 has positioning holes 401 that match the positioning posts 305. The positioning posts 305 are located inside the positioning holes 401 and the positioning posts 305 play a positioning role on the tooling plate 4.

[0064] The tooling plate 4 is equipped with a clamping plate 5 for clamping the workpiece to be processed.

[0065] The tooling plate 4 has multiple pry grooves 402 on the edge of the end face near the square column, which facilitates the prying up and disassembly of the tooling plate 4.

[0066] The tooling plate 4 has multiple connection holes 403, and the square column 303 has threaded holes corresponding to the connection holes 403. The mounting bolts pass through the connection holes 403 and are threadedly connected to the square column.

[0067] Multiple connection holes 403 are asymmetrically arranged to prevent the tooling plate 4 from being installed backwards.

[0068] Work process:

[0069] When implementing this solution, tighten the positioning bolt 9, and the slider 7 moves towards the rotating ejector pin 2. Under the action of the inclined surface of the slider 7 and the inclined surface of the positioning block 6, the arc-shaped surfaces of the four positioning blocks 6 press against the inner wall of the mounting hole, thus playing a positioning role. At this time, the main body of the tooling is coaxial with the indexing plate 1 of the four-axis machine tool. Then, tighten the connecting bolt 10 to fix the main body of the tooling, ensuring the concentricity of the main body of the tooling and the indexing plate 1 of the four-axis machine tool, thereby ensuring the machining accuracy of the parts. The operation process is simple and applicable to different models of four-axis indexing plates. Then, move and rotate the ejector pin 2 to press against the inner side of the conical pressing hole of the ejector pin hole protective sleeve 12. Finally, the dial indicator checks the circular runout of the main body of the tooling on the first inspection plate 302 and the second inspection plate 304.

[0070] The use of replaceable tooling plates 4 allows for the design of corresponding tooling plates 4 for various products according to their shape and structural characteristics. The tooling plates 4 can be quickly positioned, installed, and replaced using standardized positioning holes 401 and positioning pin holes 305, reducing the manufacturing cost of the fixtures and enabling a single fixture body 3 to process multiple products simultaneously.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rapid positioning four-axis milling machine fixture, characterized in that, include: The fixture body (3) is connected to the indexing plate (1) of the four-axis machine tool by connecting bolts (10); Positioning bolt (9), the positioning bolt (9) is threaded to the axis of the fixture body (3), and the positioning bolt (9) is installed inside the mounting hole of the indexing plate (1) of the four-axis machine tool; The slider (7) has a through hole (702) at its axis, and the positioning bolt (9) passes through the through hole (702). The outer surface of the slider (7) is an inclined surface. Positioning block (6); There are multiple positioning blocks (6), and they are all installed between the slider (7) and the mounting hole. The end face of the positioning block (6) near the slider (7) is an inclined surface. The inclined surface of the positioning block (6) is in contact with the inclined surface of the slider (7). The end face of the positioning block (6) near the mounting hole is an arc-shaped surface. The arc-shaped surface presses against the inner side of the mounting hole. Tightening the positioning bolt (9) drives the slider (7) to move axially. The inclined surface of the slider (7) forces multiple positioning blocks (6) to move radially outward synchronously until the arc surfaces of multiple positioning blocks (6) are tightly fitted with the inner sidewall of the mounting hole, thus completing the center positioning of the fixture body (3) relative to the indexing plate (1) of the four-axis machine tool.

2. The four-axis milling machine fixture for rapid positioning according to claim 1, characterized in that: The slider (7) is a square block with a through hole (702) on its upper surface that penetrates both end faces. All four sides of the square block are inclined surfaces. A positioning block (6) is provided between each of the four sides of the slider (7) and the mounting hole.

3. The four-axis milling machine fixture for rapid positioning according to claim 1, characterized in that: The indexing plate (1) of the four-axis machine tool has multiple T-slots (101). The length direction of the T-slots (101) is perpendicular to the axis of the indexing plate (1) of the four-axis machine tool. Each T-slot (101) is provided with a T-block (11). The fixture body (3) has a circular hole (30101) corresponding to the T-slot (101). The connecting bolt (10) passes through the circular hole (30101) and is threaded to the T-block (11).

4. A four-axis milling machine fixture for rapid positioning according to claim 1, characterized in that: The fixture body (3) has a T-shaped guide groove (30102) corresponding to the positioning block (6) on its end face near the positioning block (6). The length direction of the T-shaped guide groove (30102) is set along the moving direction of the positioning block (6). A T-shaped guide part (601) matching the T-shaped guide groove (30102) is fixed at one end of the positioning block (6) near the fixture body (3). The T-shaped guide part (601) is installed inside the T-shaped guide groove (30102). A square guide post (701) is fixed at one end of the positioning block (6) near the fixture body (3). A square guide groove (30103) matching the square guide post (701) is opened on the end face of the fixture body (3) near the positioning block (6). The square guide post (701) is installed inside the square guide groove (30103).

5. A four-axis milling machine fixture for rapid positioning according to claim 1, characterized in that: The fixture body (3) includes a flange (301), a first detection plate (302), a square column (303), and a second detection plate (304) connected in sequence. The flange (301) is connected to the indexing plate (1) of the four-axis machine tool by connecting bolts (10). The first detection plate (302) is a disc, and the first detection plate (302) and the square column (303) are arranged on the same axis. The second detection disk (304) is a circular disk, and the second detection disk (304) is arranged coaxially with the square column (303).

6. A four-axis milling machine fixture for rapid positioning according to claim 1, characterized in that: The fixture body (3) is provided with a pin hole protective sleeve (12) at one end away from the indexing plate (1) of the four-axis machine tool. The pin hole protective sleeve (12) has a tapered tightening hole at one end near the pin. The tapered tightening hole is coaxial with the fixture body (3). The fixture body (3) has scale markings on its end face away from the indexing plate (1) of the four-axis machine tool.

7. A rapid positioning four-axis milling machine fixture according to claim 6, characterized in that, The pin hole protective sleeve (12) is a conical structure. The clamp body (3) has a conical groove that matches the pin hole protective sleeve (12). The pin hole protective sleeve (12) is installed on the inner side of the conical groove. The pin hole protective sleeve (12) has a disassembly threaded hole (1201).

8. A four-axis milling machine fixture for rapid positioning according to claim 5, characterized in that: The square column (303) is provided with a tooling plate (4) on its side, and the tooling plate (4) is detachably connected to the square column (303) by mounting bolts; Two positioning posts (305) are fixed on the side of the square column (303), and the tooling plate (4) has positioning holes (401) that match the positioning posts (305). The positioning posts (305) are located inside the positioning holes (401). The tooling plate (4) is provided with a clamping plate (5) for clamping the workpiece to be processed.

9. A four-axis milling machine fixture for rapid positioning according to claim 8, characterized in that: The tooling plate (4) has multiple pry grooves (402) on the edge of the end face near the square column.

10. A four-axis milling machine fixture for rapid positioning according to claim 8, characterized in that: The tooling plate (4) has multiple connecting holes (403), and the square column (303) has threaded holes corresponding to the connecting holes (403). The mounting bolt passes through the connecting holes (403) and is threadedly connected to the square column. The multiple connecting holes (403) are arranged asymmetrically.

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