CN221967434U - A workpiece clamping fixture for machining center - Google Patents

Abstract

The utility model discloses a workpiece clamping jig for a machining center, and aims to solve the problem that in the prior art, a special-shaped workpiece is difficult to find a matched clamp for positioning and fixing. The device comprises a workbench, wherein an opening is formed in the middle of the workbench, a pad capable of lifting is arranged at the position of the opening, a plurality of sliding grooves pointing to the opening are formed in the periphery of the workbench, and a clamp assembly used for clamping a workpiece is slidably arranged in each sliding groove; the clamp assembly comprises a shell and a bag arranged in the shell, the outer surface of the bag is exposed out of one side pointing to the opening, the bag is filled with refrigerating fluid, and the shell is further provided with a cooling mechanism for refrigerating the refrigerating fluid; the clamping device is used for clamping various special-shaped workpieces, can ensure good clamping and fixing effects, prevents the special-shaped workpieces from loosening during processing, and has excellent adaptability and reliable fixing effects.

Description

A workpiece clamping fixture for machining center

Technical Field

The utility model relates to a workpiece clamping fixture for a machining center, belonging to the technical field of mechanical machining clamping.

Background Art

With the iteration of machining technology, the tooling and fixtures of machining centers have also undergone many changes to meet actual needs, such as flat fixtures, mechanical fixtures, pneumatic fixtures, hydraulic fixtures, and magnetic fixtures, etc. However, these fixtures can only be used to fit workpieces with regular shapes. When processing some special-shaped workpieces, such as ellipsoidal workpieces, traditional tooling and fixtures can only fit planes or corners for clamping. Such special-shaped workpieces cannot be fixed well, which results in the workpiece being easily subjected to positional changes during back-end processing, resulting in the failure of the clamping function and damage to the workpiece.

Summary of the invention

The purpose of the utility model is to overcome the deficiencies in the prior art and provide a workpiece clamping fixture for a machining center, which is used to adapt to various special-shaped workpieces for clamping, can ensure good clamping and fixing effects, prevent the special-shaped workpieces from loosening during processing, and has excellent adaptability and reliable fixing effects.

In order to achieve the above purpose, the utility model is implemented by adopting the following technical solutions:

The utility model provides a workpiece clamping fixture for a machining center, comprising a workbench, an opening is provided in the middle of the workbench, a lifting pad is provided at the opening, a plurality of slide grooves pointing to the opening are provided on the peripheral side of the workbench, a clamp assembly for clamping the workpiece is slidably arranged in the slide groove; the clamp assembly comprises a shell and a bladder arranged inside the shell, the outer surface of the bladder is exposed on a side pointing to the opening, the bladder is filled with a refrigerant, and a cooling mechanism for freezing the refrigerant is also provided on the shell.

Specifically, the bag is made of one of silicone rubber, ethylene propylene rubber or polychloroprene rubber.

Specifically, the cooling mechanism includes a heat conductive member fixedly disposed inside the shell and a first semiconductor refrigeration sheet, a cooling surface of the first semiconductor refrigeration sheet is disposed in contact with the heat conductive member, and one side of the heat conductive member is in contact with the surface of the bag.

Specifically, it also includes a second semiconductor refrigeration sheet, and the heating surface of the second semiconductor refrigeration sheet is in contact with the surface of the heat conducting member.

Specifically, the first semiconductor refrigeration plate and the second semiconductor refrigeration plate are arranged on the same plane, the heating surface of the first semiconductor refrigeration plate and the cooling surface of the second semiconductor refrigeration plate are both in contact with the shell, and a heat sink is installed at the position of the shell in contact with the heating and cooling surfaces.

Specifically, the clamp assembly can be raised and lowered relative to the workbench.

Specifically, a slide is slidably installed in the slide groove, a guide column inserted on the slide and capable of sliding in a vertical direction is provided on the shell, a stud is also fixedly installed on the shell, and an adjusting nut for threaded connection with the stud is rotatably provided on the slide.

Specifically, one side of the pouch is connected to a liquid supply tube.

Specifically, a claw for positioning the sac is provided on the opening side of the shell.

Specifically, a driving mechanism for driving the pad to rise and fall is provided at the bottom of the workbench opening.

Compared with the prior art, the utility model has the following beneficial effects:

The utility model provides a clamp assembly including a bag for storing freezing liquid, so that the bags of each clamp part can be in close contact with the surface of the workpiece before clamping the workpiece. After the contact, the freezing liquid is frozen by maintaining the contact state, and a special-shaped clamping surface that can match the clamp surface is formed by freezing. A stable clamping effect can be achieved for non-spiky special-shaped clamps, and each surface of the workpiece can be well supported and stressed during the processing, and the clamping effect is stable and not easy to fall off.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the overall structure of a workpiece clamping fixture provided by an embodiment of the utility model;

FIG2 is a front view of a workpiece clamping fixture provided by an embodiment of the utility model;

FIG3 is a cross-sectional view of the workpiece clamping fixture provided in the embodiment of FIG2 of the utility model in the direction A-A;

FIG4 is a cross-sectional view of the workpiece clamping fixture provided in the embodiment of FIG2 of the utility model in the B-B direction;

Figure numerals: 1. workbench; 2. pad; 3. slide; 4. fixture assembly; 401. shell; 402. bag; 403. heat conductor; 404. first semiconductor refrigeration plate; 405. second semiconductor refrigeration plate; 406. heat sink; 407. guide column; 408. stud; 409. liquid supply pipe; 410. claw; 5. slide; 6. adjusting nut; 7. driving mechanism.

DETAILED DESCRIPTION

The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the protection scope of the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

Example

The embodiment of the utility model provides a workpiece clamping fixture for a machining center, which is used to adapt to various special-shaped workpieces for clamping, can ensure good clamping and fixing effects, prevent the special-shaped workpieces from loosening during processing, and has excellent adaptability and reliable fixing effects. In order to realize the structural function of the device, the fixture is designed to include a workbench 1, which is a table surface for placing workpieces. In order to achieve the clamping and fixing of the workpiece, an opening is provided in the middle of the workbench 1, as shown in Figures 1 and 3, and a lifting pad 2 is provided at the opening position (the lifting action can be controlled by a driving mechanism 7, and the driving mechanism 7 is specifically The implementation method is not limited here). When placing the workpiece, it is first placed on the support platform 2, and the height position of the workpiece is adjusted by controlling the lifting of the support platform 2. In order to firmly clamp the special-shaped workpiece on the support platform 2, a plurality of slide grooves 3 pointing to the opening are provided on the peripheral side of the workbench 1, and a clamp assembly 4 for clamping the workpiece is slidably arranged in the slide groove 3. It should be noted that in order to achieve a stable clamping effect, each clamp assembly 4 can be positioned and fixed in the sliding direction of the slide groove 3; specifically, the clamp assembly 4 is provided here to include a shell 401 and a bag 402 arranged inside the shell 401, and the bag 4 The outer surface of 02 is exposed on the side pointing to the opening, as shown in Figure 1, the bag 402 is filled with a freezing liquid, and the shell 401 is also provided with a cooling mechanism for freezing the freezing liquid. When the clamp assembly 4 is in use, each shell 401 first drives the bag 402 to move to the side position of the workpiece to achieve the extrusion contact between the liquid in the bag 402 and the surface of the workpiece. After the contact is completed, the liquid in the bag 402 is cooled and fixed to make it agglomerate so that the block object is adapted to the surface of the workpiece. After the liquid in the bag 402 is completely solidified, the pad 2 can be selectively evacuated, and then the position of the workpiece is measured and the corresponding pressure is increased. The structure can pick up the irregular surface of the special-shaped workpiece through the flexibility of the liquid, and then position the special-shaped workpiece through solidification. Although the waiting time for solidification causes a long time to clamp the workpiece, it can achieve the clamping and positioning of various special-shaped workpieces without damaging the surface of the workpiece easily. In addition to the freezing liquid such as daily life water, glycerin can also be used as a replacement for the above-mentioned freezing liquid. The melting point of glycerin is 18°C. At room temperature, the state of the freezing liquid can be changed with a smaller temperature amplitude, that is, it has a better condensation efficiency, which can save both freezing time and energy required for freezing.

The embodiment of the utility model provides a workpiece clamping fixture for a machining center. Since the freezing liquid will produce a corresponding volume change when it is thawed, the bag 402 is required to maintain better elasticity under low temperature conditions to avoid low temperature deformation and damage to the bag 402. Specifically, the bag 402 can be set to one of silicone rubber, EPDM rubber or polychloroprene rubber, wherein the working temperature of silicone rubber is between -55°C and 300°C, the working temperature of EPDM rubber is between -50°C and 150°C, and the working temperature of polychloroprene rubber is between -40°C and 120°C.

The present invention provides a workpiece clamping fixture for a machining center. In order to achieve lightweight structure and low power consumption of the device, a cooling mechanism can be provided, including a heat-conducting member 403 fixedly arranged inside the housing 401 and a first semiconductor cooling plate 404. As shown in FIG3 , the cooling surface of the first semiconductor cooling plate 404 is arranged in contact with the heat-conducting member 403, and one side of the heat-conducting member 403 is in contact with the surface of the bag 402. When the first semiconductor cooling plate 404 is working, the cooling surface absorbs the temperature, causing the temperature of the heat-conducting member 403 to drop. The heat-conducting member 403 conducts the low temperature to the bag 402, and after a period of time, the freezing liquid in the bag 402 is frozen. In some embodiments, in order to quickly melt the frozen block of the bag 402 and re-form it into a soft-package liquid, the device is provided here and further includes a second semiconductor cooling plate 405. At this time, the heating surface of the second semiconductor cooling plate 405 is in contact with the surface of the heat-conducting member 403. At this time, the distribution of the two semiconductor cooling plates can be shown in FIG4 . It should be noted that the two will not work at the same time when in use. After the above settings, as a preferred way to dissipate heat, the first semiconductor refrigeration plate 404 and the second semiconductor refrigeration plate 405 can be arranged on the same plane. Specifically, the heating surface of the first semiconductor refrigeration plate 404 and the cooling surface of the second semiconductor refrigeration plate 405 are in contact with the shell 401, and a heat sink 406 is installed at the position of the shell 401 that is in contact with the heated and cooled surfaces. When the first semiconductor refrigeration plate 404 is working, the heat on the other side is conducted to the heat sink 406 through the shell 401 to prevent the temperature of the heating surface of the first semiconductor refrigeration plate 404 from being too high.

The embodiment of the utility model provides a workpiece clamping fixture for a machining center. In order to facilitate the adjustment of the clamp assembly 4 to a height position suitable for the workpiece, the clamp assembly 4 can be set to be able to perform lifting and lowering actions relative to the workbench 1. Specifically, a slide 5 can be slidably installed in the slide groove 3, and a guide column 407 inserted on the slide 5 and capable of sliding in the vertical direction is provided on the housing 401, so that the housing 401 can be lifted and lowered relative to the slide 5. The slide 5 is provided with a locking bolt that can be used to fix the slide 5 at a corresponding position on the workbench 1. In order to adjust the height position, a stud 408 is also fixedly installed on the housing 401. As shown in Figures 3 and 4, an adjusting nut 6 for threaded connection with the stud 408 is rotatably provided on the slide 5. When the height position of the housing 401 needs to be adjusted, the adjusting nut 6 can be rotated.

The embodiment of the utility model provides a workpiece clamping fixture for a machining center. In order to ensure the filling state of the sac 402 according to actual needs, a liquid supply pipe 409 can be provided on one side of the sac 402. When there is too much refrigerant, some refrigerant can be drawn out, and vice versa, a certain amount of refrigerant can be supplied again. In the above embodiment, one side of the sac 402 is directly positioned and attached to the heat conductor 403, while the other side has no relevant deformation limit. Specifically, a claw 410 for positioning the sac 402 can be provided on the opening side of the shell 401. When the sac 402 is deformed, the side claw 410 limits the side of the sac 402, and drives the elastic deformation of the liquid to concentrate in the middle, which is also more conducive to ensuring the final stable clamping effect.

The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (10)

1. The workpiece clamping jig for the machining center is characterized by comprising a workbench (1), wherein an opening is formed in the middle of the workbench (1), a lifting pad table (2) is arranged at the position of the opening, a plurality of sliding grooves (3) pointing to the opening are formed in the periphery of the workbench (1), and a clamp assembly (4) for clamping a workpiece is arranged in the sliding grooves (3) in a sliding mode; the fixture assembly (4) comprises a shell (401) and a bag (402) arranged in the shell (401), wherein the outer surface of the bag (402) is exposed out of one side pointing to the opening, the bag (402) is filled with refrigerating fluid, and the shell (401) is further provided with a cooling mechanism for refrigerating the refrigerating fluid.

2. The tool clamping jig for a machining center according to claim 1, wherein the pocket (402) is one of silicone rubber, ethylene propylene rubber or neoprene rubber.

3. The workpiece clamping jig for a machining center according to claim 1, wherein the cooling mechanism comprises a heat conducting member (403) fixedly arranged in the casing (401) and a first semiconductor refrigerating plate (404), a refrigerating surface of the first semiconductor refrigerating plate (404) is attached to the heat conducting member (403), and one side of the heat conducting member (403) is attached to and contacted with the surface of the bag (402).

4. A workpiece clamping fixture for a machining center according to claim 3, further comprising a second semiconductor cooling sheet (405), wherein a heating surface of the second semiconductor cooling sheet (405) is in contact with a surface of the heat conducting member (403).

5. The workpiece clamping jig for a machining center according to claim 4, wherein the first semiconductor cooling plate (404) and the second semiconductor cooling plate (405) are arranged on the same plane, a heating surface of the first semiconductor cooling plate (404) and a cooling surface of the second semiconductor cooling plate (405) are in contact with the shell (401), and a heat dissipation plate (406) is mounted at a position of the shell (401) where the shell is heated and the cooling surface is cooled.

6. The workpiece clamping jig for machining centers according to claim 1, characterized in that the jig assembly (4) is capable of lifting and lowering with respect to the table (1).

7. The workpiece clamping jig for the machining center according to claim 6, wherein a sliding table (5) is slidably installed in the sliding groove (3), a guide post (407) which is capable of sliding along the vertical direction and is inserted on the sliding table (5) is arranged on the shell (401), a stud (408) is fixedly installed on the shell (401), and an adjusting nut (6) which is in threaded connection with the stud (408) is rotatably arranged on the sliding table (5).

8. The workpiece clamping jig for a machining center according to claim 1, wherein a liquid supply pipe (409) is provided on one side of the bag (402) in communication.

9. The workpiece clamping jig for machining centers according to claim 1, characterized in that the opening side of the housing (401) is provided with a claw (410) for positioning the pocket (402).

10. The workpiece clamping jig for the machining center according to claim 1, wherein a driving mechanism (7) for driving the cushion table (2) to lift is arranged at the bottom of the opening of the workbench (1).