Positioning mechanism for planar machining of large flat thin-walled workpieces

Abstract

The utility model relates to a kind of big flat plate thin-walled workpiece plane processing positioning mechanism, including bottom plate, the bottom plate is equipped with the positioning device for limiting workpiece horizontal direction degree of freedom, the compacting device for compacting workpiece and several support column for supporting workpiece, the bottom plate middle is also provided with the expansion sleeve adapted with workpiece middle hole, expansion sleeve middle is equipped with the pull rod for pulling expansion sleeve downward is passed in.This utility model big flat plate thin-walled workpiece plane processing positioning mechanism design is reasonable, structure is novel, convenient and practical, utilize the hole in the middle position of workpiece, design expansion sleeve to clamp the hole on workpiece, then cooperate pull rod, utilize pull rod to keep pulling expansion sleeve down continuously, provide the continuous pressure of pressing down for workpiece position, to ensure the clamping stability of workpiece, improve processing accuracy, avoid the phenomenon of vibration and shaking due to workpiece clamping bad, ensure product quality.

Description

Technical Field

[0001] This utility model relates to the field of tooling and fixtures, and in particular to a planar machining positioning mechanism for large flat, thin-walled workpieces. Background Technology

[0002] A large, thin-walled flat workpiece 700 with a hole in the middle (generally with dimensions of 400*400 or larger and a thickness of 10~20mm), such as... Figure 1 As shown, when machining the entire large plane, the existing fixtures usually do not have a pressing point in the middle position, but only a pressing point on the side. This results in the middle position of the workpiece being too empty, causing vibration of the tool and workpiece during machining, which can easily lead to unevenness of the machined plane and the presence of stepped surfaces. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a planar machining positioning mechanism for large flat, thin-walled workpieces, ensuring stable workpiece clamping, improving machining accuracy, and avoiding vibration and shaking caused by poor workpiece clamping.

[0004] This utility model is implemented using the following scheme: a planar machining positioning mechanism for a large flat thin-walled workpiece, including a base plate. The base plate is provided with a positioning device for restricting the horizontal degree of freedom of the workpiece, a clamping device for clamping the workpiece, and a number of support columns for supporting the workpiece. The base plate is also provided with an expansion sleeve adapted to the middle hole of the workpiece, and a pull rod for pulling the expansion sleeve downward is provided in the middle of the expansion sleeve.

[0005] Furthermore, the expansion sleeve includes a circular expansion sleeve body and a fixed post fixedly connected to the center of the bottom of the expansion sleeve body. The expansion sleeve body is divided into several fan-shaped parts by several slits. A central hole is opened at the center of the upper end of the expansion sleeve body, which passes through the lower end of the fixed post. The pull rod is located in the central hole. A tapered groove with a larger upper end and a smaller lower end is provided at the upper end of the central hole. A tapered part that matches the tapered groove is provided at the upper end of the pull rod.

[0006] Furthermore, a mounting base is provided below the expansion sleeve and is connected to the base plate by bolts. The mounting base has a mounting hole in the middle, and the lower part of the fixing column is inserted into the mounting hole of the mounting base.

[0007] Furthermore, the upper end of the mounting hole of the mounting base is tapered, and the upper part of the fixing post is provided with an annular part that is locked above the mounting hole. The lower side of the annular part is a tapered surface that matches the opening of the mounting hole.

[0008] Furthermore, the lower end of the pull rod passes downward through the mounting hole and the base plate and is connected to the telescopic rod of the pull-down cylinder installed on the lower side of the base plate.

[0009] Furthermore, the positioning device includes a pair of positioning posts located on both sides of the front part of the base plate to abut against the front side of the workpiece, and a pair of positioning pins located on both sides of the rear part of the base plate to abut against the rear sides of the workpiece.

[0010] Furthermore, the clamping device includes three clamping cylinders, two of which are located on the front sides of the base plate, and the third clamping cylinder is located in the middle of the rear of the bottom.

[0011] Compared with the prior art, the present invention has the following beneficial effects: The positioning mechanism for large flat thin-walled workpieces is reasonably designed, has a novel structure, and is convenient and practical. It utilizes the hole in the middle of the workpiece and designs an expansion sleeve to clamp the hole on the workpiece. In conjunction with the pull rod, the pull rod continuously pulls down the expansion sleeve, providing continuous downward pressure to the workpiece position, thereby ensuring stable workpiece clamping, improving processing accuracy, avoiding vibration and shaking caused by poor workpiece clamping, and ensuring product quality.

[0012] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below through specific embodiments and related drawings. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of an existing large flat, thin-walled workpiece structure;

[0014] Figure 2 This is a frontal perspective view of the positioning mechanism in use according to an embodiment of this utility model;

[0015] Figure 3 This is a three-dimensional view of the positioning mechanism in use according to an embodiment of this utility model;

[0016] Figure 4 This is a perspective view of the positioning mechanism according to an embodiment of the present utility model;

[0017] Figure 5 This is a schematic diagram of the expansion sleeve installation according to an embodiment of this utility model;

[0018] Figure 6 yes Figure 5 Sectional view of AA;

[0019] Figure 7 This is a top perspective view of an embodiment of the present invention where the expansion sleeve omits the pull rod;

[0020] Figure 8 This is a bottom perspective view of an embodiment of the present invention, showing the expansion sleeve without the pull rod.

[0021] The following are the labels in the diagram: 100-base plate, 110-mounting seat, 200-positioning device, 210-positioning post, 220-positioning pin, 300-clamping device, 310-clamping cylinder, 400-support post, 500-expansion sleeve, 510-expansion sleeve body, 511-conical groove, 512-cut slit, 520-fixing post, 521-ring part, 530-pull rod, 531-conical part, 540-center hole, 600-pull-down cylinder, 700-workpiece, 710-hole. Detailed Implementation

[0022] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] like Figures 2-8 As shown, a planar machining positioning mechanism for a large flat, thin-walled workpiece includes a base plate 100. The base plate is equipped with a positioning device 200 to restrict the horizontal degree of freedom of the workpiece, a clamping device 300 to clamp the workpiece, and several support columns 400 to support the workpiece. A tension sleeve 500 adapted to a central hole in the workpiece is also provided in the center of the base plate. A pull rod 530 for pulling the tension sleeve downwards passes through the center of the tension sleeve. After the workpiece is placed on the positioning mechanism, the positioning device and the clamping device complete the positioning and clamping of the workpiece. Furthermore, this positioning mechanism effectively utilizes the central hole in the workpiece. The tension sleeve 500 is designed to clamp the hole in the workpiece, and in conjunction with the pull rod, the pull rod continuously pulls down the tension sleeve, providing continuous downward pressure to ensure stable workpiece clamping, improve machining accuracy, avoid vibration and shaking caused by poor workpiece clamping, and ensure product quality.

[0025] In this embodiment, the expansion sleeve 500 includes a circular expansion sleeve body 510 and a fixed post 520 fixedly connected to the center of the bottom of the expansion sleeve body. The expansion sleeve body 510 is divided into several fan-shaped parts by several slits 512. A central hole 540 is opened at the center of the upper end of the expansion sleeve body, which passes through the lower end of the fixed post. The pull rod 530 is located in the central hole. A tapered groove 511 with a larger upper end and a smaller lower end is provided at the upper end of the central hole. A tapered part 531 that matches the tapered groove is provided at the upper end of the pull rod. A radial hole with the same shape as each slit is provided at the upper part of the fixed post 520. When the pull rod is pulled down, the expansion sleeve body 510 expands and clamps the hole of the workpiece through the cooperation of the tapered part 531 and the tapered groove 511. When the pull rod continues to pull down the expansion sleeve, it will provide downward pressure to the middle position of the workpiece (i.e., the hole position) through the expansion sleeve.

[0026] In this embodiment, a mounting base 110 is provided below the expansion sleeve and is connected to the base plate by bolts. The mounting base has a mounting hole in the middle, and the lower part of the fixing column is inserted into the mounting hole of the mounting base.

[0027] In this embodiment, the upper end of the mounting hole of the mounting base is tapered, and the upper part of the fixing post is provided with an annular part 521 that is locked above the mounting hole. The lower side of the annular part is a tapered surface that matches the opening of the mounting hole.

[0028] In this embodiment, the lower end of the pull rod passes downward through the mounting hole and the base plate and is connected to the telescopic rod of the pull-down cylinder 600 installed on the lower side of the base plate. The pull rod is tightened and loosened by the pull-down cylinder 600.

[0029] In this embodiment, the positioning device 200 includes a pair of positioning posts 210 located on both sides of the front part of the base plate to abut against the front side of the workpiece, and a pair of positioning pins 220 located on both sides of the rear part of the base plate to abut against the rear sides of the workpiece.

[0030] In this embodiment, the clamping device 300 includes three clamping cylinders 310, two of which are located on the front sides of the base plate, and the third clamping cylinder is located in the middle of the rear of the bottom.

[0031] In this embodiment, there are approximately 15 support columns 400, four of which are distributed around the expansion sleeve to support the edge of the workpiece hole and ensure the clamping effect at that location. The other three are located at the clamping positions of the three clamping cylinders 310, and cooperate with the clamping cylinders to clamp the workpiece.

[0032] Unless otherwise stated, if any of the technical solutions disclosed in this utility model discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this utility model discloses only some numerical values ​​to illustrate the technical solutions of this utility model. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this utility model.

[0033] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured by integral molding using a casting process) (except where it is obviously impossible to use an integral molding process).

[0034] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0035] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0036] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A planar machining positioning mechanism for a large flat, thin-walled workpiece, characterized in that: The device includes a base plate, which is equipped with a positioning device for restricting the horizontal degree of freedom of the workpiece, a clamping device for pressing the workpiece, and a number of support columns for supporting the workpiece. The base plate is also provided with an expansion sleeve that is adapted to the middle hole of the workpiece, and a pull rod for pulling the expansion sleeve downward is inserted through the middle of the expansion sleeve.

2. The planar machining positioning mechanism for large flat, thin-walled workpieces according to claim 1, characterized in that: The expansion sleeve includes a circular expansion sleeve body and a fixed post fixedly connected to the center of the bottom of the expansion sleeve body. The expansion sleeve body is divided into several fan-shaped parts by several slits. A central hole is opened at the center of the upper end of the expansion sleeve body, which passes through the lower end of the fixed post. The pull rod is located in the central hole. A tapered groove with a larger upper end and a smaller lower end is provided at the upper end of the central hole. A tapered part that matches the tapered groove is provided at the upper end of the pull rod.

3. The planar machining positioning mechanism for large flat, thin-walled workpieces according to claim 2, characterized in that: The expansion sleeve is provided with a mounting base that is bolted to the base plate. The mounting base has a mounting hole in the middle, and the lower part of the fixing column is inserted into the mounting hole of the mounting base.

4. The planar machining positioning mechanism for large flat, thin-walled workpieces according to claim 3, characterized in that: The upper end of the mounting hole of the mounting base is tapered, and the upper part of the fixing post is provided with an annular part that is locked above the mounting hole. The lower side of the annular part is a tapered surface that matches the opening of the mounting hole.

5. The planar machining positioning mechanism for large flat, thin-walled workpieces according to claim 2, characterized in that: The lower end of the pull rod passes downward through the mounting hole and the base plate, and then connects to the telescopic rod of the pull-down cylinder installed on the lower side of the base plate.

6. The planar machining positioning mechanism for large flat, thin-walled workpieces according to claim 1, characterized in that: The positioning device includes a pair of positioning posts located on both sides of the front part of the base plate to abut against the front side of the workpiece, and a pair of positioning pins located on both sides of the rear part of the base plate to abut against the rear sides of the workpiece.

7. The planar machining positioning mechanism for large flat, thin-walled workpieces according to claim 1, characterized in that: The clamping device includes three clamping cylinders, two of which are located on the front sides of the base plate, and the third clamping cylinder is located in the middle of the rear of the bottom.

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