Quick-change tool for machine tool clamp

Abstract

The utility model discloses a machine tool clamp quick-change tool which comprises a shell, a worm and gear transmission system is installed in the shell, the worm and gear transmission system is connected with a rocker, and the rocker extends out of the side face of the shell. The worm gear transmission system is in butt joint with a screw, and the top end of the screw is connected with an elastic clamping jaw. A mounting base is mounted on the upper portion of the shell, the screw extends into the mounting base to enable the elastic clamping jaw to be embedded in the mounting base, and the elastic clamping jaw clamps a connecting rod arranged at the bottom of the clamp to achieve mounting and fixing of the clamp. The rocker drives the worm and gear system to rotate, the worm and gear system drives the screw to move up and down and drives the elastic clamping jaw to move up and down, the elastic clamping jaw can grasp the connecting rod of the clamp and pull the connecting rod downwards, so that the clamp is pulled to move downwards, and finally, the positioning surface of the clamp is attached to the reference surface of the tool shell to lock the tool. After replacement, machining can be carried out only by aligning the Z-axis coordinates of the part once, operation is easier and faster, and efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of industrial production equipment technology, and in particular to a tooling for changing machine tool fixtures. Background Technology

[0002] In the processing of hardware products, CNC machine tools are frequently used. During CNC machining, the product parts must be positioned. As the structure of parts becomes more complex, different fixtures need to be changed when machining different products. For example, round parts are generally mounted using a three-jaw chuck, while square parts are generally mounted using a self-centering vise. Each fixture change wastes a significant amount of time on installation, debugging, and realignment, which not only greatly reduces production efficiency but also introduces more errors. Therefore, quick fixture changing devices that eliminate the need for realignment after replacement have been designed to improve production efficiency and machining accuracy. For example, Chinese Utility Model Patent CN204700604U discloses a quick fixture changing device for CNC machine tools, which allows for rapid fixture replacement by simply disassembling and adjusting the connecting guide pillars and positioning pins, significantly reducing fixture change time. However, this solution has some problems. For example, it requires the cooperation of multiple connecting guide pins and positioning pins to position and fix the fixture, which is quite cumbersome. Also, it uses dovetail grooves to connect with the machine tool fixed table, but the alignment of the dovetail grooves obviously requires very precise operation. The fixture and the fixture connecting plate together are quite heavy, which makes the operation troublesome. Utility Model Content

[0003] This invention addresses the shortcomings of existing technologies by providing a quick-change tooling fixture for machine tools that is simple in structure, easier to install and operate, and can significantly reduce fixture change time.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a quick-change machine tool fixture, comprising a housing, which is mounted on a machine tool; a worm gear transmission system is installed in the housing, and a rocker arm is connected to the worm gear transmission system, extending from the side of the housing; a screw is connected to the worm gear transmission system, and an elastic gripper is connected to the top of the screw, the elastic gripper being a conical structure wider at the top and narrower at the bottom; a mounting base is installed on the upper part of the housing, the mounting base having a conical cavity with a shape matching the shape of the elastic gripper, the screw extending into the mounting base so that the elastic gripper is embedded in the mounting base, and the fixture is installed and fixed by clamping the connecting rod set at the bottom of the fixture by the elastic gripper.

[0005] Furthermore, the housing includes a base at the bottom and a support at the top, with the base and support extending outward relative to the main body of the housing. The mounting seat is embedded in the support, and after the screw is raised, the elastic gripper extends upward from the support.

[0006] Furthermore, several positioning pins are provided on the support base, and several positioning holes that match the positioning pins are provided on the bottom surface of the fixture. After the fixture is lowered, the positioning pins are inserted into the corresponding positioning holes to achieve the positioning of the fixture.

[0007] Furthermore, the worm gear transmission system includes a worm and a worm wheel. The worm is horizontally mounted in the housing via a bearing, and the worm wheel is vertically screwed onto the worm and meshes with it.

[0008] Furthermore, at least one end of the worm extends out of the side of the housing to form a rocker arm for rocking the worm to rotate.

[0009] Furthermore, the screw is vertically mounted in the housing via at least two bearings, one above and one below the worm gear.

[0010] Furthermore, the elastic gripper has several claw plates, each claw plate is separated from each other to form an independent structure, and the bottom ends of the claw plates are connected together and then connected to the top end of the screw to form an integral structure.

[0011] Furthermore, the connecting rod is vertically fixed to the bottom of the clamp and extends downwards. The bottom end of the connecting rod has a connector head that gradually tapers downwards to form a tapered structure, which is clamped by elastic jaws.

[0012] Furthermore, a downward protruding positioning part is provided on the bottom surface of the base. The positioning part is inserted into the positioning hole of the five-axis rotary table of the machine tool to achieve positioning, and the bottom surface of the base is in contact with the table surface of the five-axis rotary table of the machine tool.

[0013] This invention utilizes a rocker arm to drive a worm gear system, which in turn rotates a screw, causing it to move up and down. This movement in turn moves a flexible gripper at the top of the screw, which in turn grips the connecting rod of the fixture and pulls it downwards. This pulls the fixture downwards, and through the engagement of a locating pin, the fixture's locating surface is finally brought into contact with the reference surface of the tooling housing, thus locking the fixture in place. Changing a set of fixtures takes only about 3 minutes, and subsequent machining only requires aligning the Z-axis coordinates of the part once. This makes the operation easier and faster, significantly improving efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a side view of the present invention.

[0016] Figure 3 for Figure 2 AA cross-section view;

[0017] Figure 4 for Figure 2 BB cross-section;

[0018] Figure 5 This is a structural diagram of a worm gear system;

[0019] Figure 6 This is a diagram showing the mating structure of the elastic gripper and the connecting rod.

[0020] Figure 7 This is a schematic diagram of the self-centering vise used in this utility model to clamp a square part;

[0021] Figure 8 This is a schematic diagram of the three-jaw chuck used in this utility model to clamp a circular part.

[0022] In the diagram, 1 is the housing, 11 is the base, 12 is the support, 13 is the positioning part, 14 is the positioning pin, 21 is the worm, 22 is the worm wheel, 23 is the rocker arm, 3 is the screw, 31 is the elastic jaw, 32 is the bearing, 4 is the mounting base, 5 is the connecting rod, 51 is the connector, 6 is the self-centering vise, 7 is the three-jaw chuck, 8 is the square part, and 9 is the round part. Detailed Implementation

[0023] In this embodiment, refer to Figures 1-6 The machine tool fixture quick-change tooling includes a housing 1, which is mounted on a machine tool. A worm gear transmission system is installed in the housing 1, connected to a rocker arm 23 extending from the side of the housing. A screw 3 is connected to the worm gear transmission system, with an elastic gripper 31 connected to the top of the screw 3. The elastic gripper 31 has a tapered structure, wider at the top and narrower at the bottom. A mounting base 4 is installed on the upper part of the housing 1. The mounting base 4 has a tapered cavity whose shape matches the elastic gripper 31. The screw 3 extends into the mounting base 4, embedding the elastic gripper 31 within it. The fixture is fixed by clamping the connecting rod 5 at the bottom of the fixture (such as a self-centering vise 6 or a three-jaw chuck 7). This allows for easy replacement of different fixtures to fix different parts. For example, a self-centering vise 6 can be used to clamp a square part 8, and a three-jaw chuck 7 can be used to clamp a round part 9. Figure 7 and Figure 8 As shown.

[0024] The housing 1 includes a base 11 at the bottom and a support 12 at the top. The base 11 and the support 12 extend outward relative to the main body of the housing 1. The mounting seat 4 is embedded in the support 12. After the screw 3 is raised, the elastic gripper 31 extends upward from the support 12.

[0025] Four positioning pins 14 are provided on the support base 12, and positioning holes that match the positioning pins 14 are provided on the bottom surface of the fixture. After the fixture is lowered, the positioning pins 14 are inserted into the corresponding positioning holes to achieve the positioning of the fixture.

[0026] The worm gear transmission system includes a worm 21 and a worm wheel 22. The worm 21 is horizontally mounted in the housing 1 via a bearing, and the worm wheel 22 is vertically screwed onto the screw 3 and meshes with the worm 21.

[0027] One end of the worm 21 extends out of the side of the housing 1 to form a rocker arm 23, which can be used to rotate the worm 21 by inserting a handle.

[0028] The screw 3 is vertically mounted in the housing 1 via at least two bearings 32, with each bearing 32 located above and below the worm gear 22, respectively.

[0029] The elastic gripper 31 has several claw plates, each claw plate being separated from each other to form an independent structure. The bottom ends of the claw plates are connected together and then connected to the top end of the screw 3 to form an integral structure. When the elastic gripper 31 moves downward in the conical cavity of the mounting base 4, it will contract due to the squeezing force of the mounting base 4, thereby achieving a clamping effect. When it moves upward, it will release.

[0030] The connecting rod 5 is vertically fixed to the bottom of the clamp and extends downward. The bottom end of the connecting rod 5 has a connecting head 51 that gradually tapers downward to form a tapered structure so that it can be matched with the elastic gripper 31 and clamped by it.

[0031] A downward protruding positioning part 13 is provided on the bottom surface of the base 11. The positioning part 13 is inserted into the positioning hole of the five-axis rotary table of the machine tool to achieve positioning, and the bottom surface of the base 11 is in contact with the table surface of the five-axis rotary table of the machine tool.

[0032] Rotating the rocker arm drives the worm gear 21 to rotate, which in turn drives the worm wheel 22 to rotate. The worm wheel 22 then drives the screw 3 to move up and down, causing the elastic gripper 31 to rise or fall. Because the conical inner cavity of the mounting base 4 mates with the outer conical surface of the elastic gripper 31, when the elastic gripper 31 grips the connector 51 of the connecting rod 5, the tapered action causes the elastic gripper 31 to retract and pull the fixture downwards. With the cooperation of the four positioning pins 14, the positioning surface of the fixture is brought into contact with the upper surface of the support base 12, locking the fixture in place. The self-locking function of the worm gear and worm wheel integrates the fixture with the main body of the fixture. To disassemble the fixture, first rotate the rocker arm 23 in the opposite direction to extend the elastic gripper 31 out of the mounting base 4. Again, due to the tapered action, the elastic gripper 31 will gradually loosen the connector 51 as it moves upwards, allowing it to be removed.

[0033] Compared to traditional methods, changing a fixture used to take about 2.5 hours, and each time the X, Y, and Z coordinate origins of the fixture needed to be re-aligned, which took even longer. Using this new method, the change only takes about 3 minutes. Based on a 5-axis CNC machine tool processing cost of 120 yuan / hour, the savings per fixture change are: 120 yuan / hour * 2.5 - 3 * 2 yuan / minute = 294 yuan. Due to the high tooling change rate, the long-term savings in time and cost are even greater.

[0034] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of this application should still fall within the scope of the present invention.

Claims

1. A quick-change tooling fixture for machine tools, characterized in that: The fixture includes a housing, which is mounted on a machine tool. A worm gear transmission system is installed within the housing, connected to a rocker arm that extends from the side of the housing. A screw is connected to the worm gear transmission system, with a flexible gripper at the top of the screw. The flexible gripper has a tapered structure, wider at the top and narrower at the bottom. A mounting base is installed on the upper part of the housing, containing a tapered cavity whose shape matches the flexible gripper. The screw extends into the mounting base, embedding the flexible gripper within it. The flexible gripper clamps a connecting rod located at the bottom of the fixture, thus securing the fixture in place.

2. The quick-change fixture for machine tools according to claim 1, characterized in that: The housing includes a base at the bottom and a support at the top. The base and support extend outward relative to the main body of the housing. The mounting seat is embedded in the support. After the screw is raised, the elastic gripper extends upward from the support.

3. The quick-change tooling fixture for machine tools according to claim 2, characterized in that: Several positioning pins are provided on the support base, and several positioning holes that match the positioning pins are provided on the bottom surface of the fixture. After the fixture is lowered, the positioning pins are inserted into the corresponding positioning holes to achieve the positioning of the fixture.

4. The quick-change tooling fixture for machine tools according to claim 1, characterized in that: The worm gear transmission system includes a worm and a worm wheel. The worm is horizontally mounted in the housing via a bearing, and the worm wheel is vertically screwed onto the worm and meshes with it.

5. The quick-change fixture for machine tools according to claim 4, characterized in that: At least one end of the worm extends out of the side of the housing to form a rocker arm.

6. The quick-change tooling fixture for machine tools according to claim 4, characterized in that: The screw is vertically mounted in the housing via at least two bearings, one above and one below the worm gear.

7. The quick-change tooling fixture for machine tools according to claim 1, characterized in that: The elastic gripper has several claw plates, each claw plate is separated from each other to form an independent structure, and the bottom ends of the claw plates are connected together and then connected to the top end of the screw to form an integral structure.

8. The quick-change tooling fixture for machine tools according to claim 1, characterized in that: The connecting rod is vertically fixed to the bottom of the clamp and extends downwards. The bottom end of the connecting rod has a connector head that gradually tapers downwards to form a tapered structure, which is clamped by elastic jaws.

9. The quick-change tooling fixture for machine tools according to claim 2, characterized in that: A downward-protruding positioning part is provided on the bottom surface of the base. The positioning part is inserted into the positioning hole of the five-axis rotary table of the machine tool to achieve positioning and make the bottom surface of the base fit against the table surface of the five-axis rotary table of the machine tool.

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