Insulated gate bipolar transistor (IGBT) heat dissipation substrate centering clamp

Abstract

The utility model provides an IGBT heat dissipation substrate centering clamp, comprising a positioning clamp, the positioning clamp comprises two jaws capable of being opened and closed and a cylinder, when the two jaws are closed, an accommodating space for accommodating heat dissipation substrate pins is formed, a wall surface of the accommodating space vertical to a jaw separation direction is provided with a positioning groove, the positioning groove is matched with the heat dissipation substrate pins, and the cylinder is provided with a positioning groove. At least one jaw is provided with an air hole which is connected with a negative pressure mechanism; a crank mounting cavity is formed in the top of the air cylinder, the two cranks are rotationally connected into the crank mounting cavity, and one ends of the two cranks are hinged to a piston rod of the air cylinder; the two jaws are detachably connected to the top of the crank mounting cavity in a sliding mode, and the other end of each crank is hinged to the bottom face of the corresponding jaw. The IGBT heat dissipation substrate centering clamp is suitable for a CNC machining center, is simple in structure, low in assembly precision requirement, small in part number and low in manufacturing cost, can play a fool-proof role, and can adapt to products of different sizes at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical workholding fixtures, and particularly relates to a centering fixture for an IGBT heat dissipation substrate. Background Art

[0002] The needle-shaped structure of the heat dissipation copper plate needs to be formed by a cold forging process. As the mold wears, the shape and size of the machined parts will also change. The needle-shaped structure surface formed by cold forging is used as the reference surface, and all subsequent processes also need to be carried out with this as the reference center. In the face of the dimensional tolerance changes caused by forging, different sizes of positioning workpieces need to be adapted.

[0003] The currently commonly used heat dissipation substrate fixtures mainly include the following several types:

[0004] 1. Self-centering vise, which drives two jaws to move simultaneously through a screw to fix the workpiece. Clamping of this type of fixture requires manual tightening, resulting in a large workload for personnel. Chips falling onto the screw will cause jamming, affecting clamping.

[0005] 2. Crank structure automatic centering and clamping fixture, which has a single-direction centering and positioning function. However, the crank structure design is relatively complex, the overall design has a large number of parts, high precision requirements, and a long production cycle.

[0006] 3. Hydraulic synchronous self-centering fixture, which also has a single-direction centering and positioning function, and its disadvantages are the same as those of the crank structure automatic centering and clamping fixture.

[0007] 4. Profiling positioning fixed suction cup, which needs to customize workpieces of different sizes according to the incoming material size, and it takes a long time for CNC machine setup and adjustment. Content of the Utility Model

[0008] In order to make up for the deficiencies in the prior art, the utility model provides a centering fixture for an IGBT heat dissipation substrate, which has a relatively simple structure, low assembly precision requirements, a small number of parts, reduced production costs, and can adapt to products of different sizes.

[0009] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0010] An IGBT heat dissipation substrate centering fixture includes a positioning clamp. The positioning clamp includes two openable and closable jaws and a cylinder. When the two jaws are closed, a receiving space for accommodating the pins of the heat dissipation substrate is formed. A positioning groove is provided on a wall surface of the receiving space perpendicular to the separation direction of the jaws. The positioning groove matches the pins of the heat dissipation substrate. At least one of the jaws is provided with an air hole, and the air hole is connected to a negative pressure mechanism. A crank mounting cavity is provided at the top of the cylinder. Two cranks are rotatably connected in the crank mounting cavity, and one end of each of the two cranks is hinged to the piston rod of the cylinder. The two jaws are detachably and slidably connected to the top of the crank mounting cavity, and the other end of each crank is respectively hinged to the bottom surface of one of the jaws.

[0011] Further, it further includes a box body. The positioning clamp is arranged in the box body. A through hole exposing the jaws is provided at the top of the box body. An air valve switch and a vacuum switch are provided on one side of the box body. The air valve switch is connected to an air compressor and the cylinder, and the vacuum switch is connected to the air hole and the negative pressure mechanism.

[0012] Further, a plurality of positioning clamps are provided in the box body.

[0013] Further, the box body is a top-open structure. A connecting panel is arranged at the top of the box body, and the through hole is arranged on the connecting panel.

[0014] Further, a detachable support frame is provided on the through hole.

[0015] Compared with the prior art, the present utility model has the following beneficial technical effects:

[0016] The IGBT heat dissipation substrate centering fixture of the present utility model is applicable to a CNC machining center. Its structure is relatively simple, the assembly precision requirements between parts are not high, it occupies a small space, is dust-proof, and the pneumatic control clamping operation is easy. The number of parts is small, greatly reducing the production cost. It can adapt to products of different sizes only by replacing its jaws and support frame, and can play an anti-fooling role. Description of the Drawings

[0017] Figure 1 is a structural diagram of an IGBT heat dissipation substrate centering fixture of the present utility model.

[0018] Figure 2 is an exploded view of an IGBT heat dissipation substrate centering fixture of the present utility model.

[0019] Figure 3 is a structural diagram of the positioning clamp of the present utility model.

[0020] Figure 4 is a sectional view of the positioning clamp of the present utility model.

[0021] Wherein: 1. Box body; 2. Positioning clamp; 21. Clamp jaw; 211. Positioning groove; 22. Cylinder; 23. Crank; 24. Piston rod; 3. Connection panel; 4. Support frame; 5. Air valve switch; 6. Vacuum switch. Detailed implementation mode

[0022] In the following description, many specific details are set forth in order to provide a thorough understanding of the present utility model. However, the present utility model can be implemented in many other ways different from this description, and those skilled in the art can make similar extensions without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0023] Embodiment 1

[0024] As Figure 1 、 2 shown, an IGBT heat dissipation substrate centering fixture includes a box body 1. The box body 1 has an open top structure and is provided with a plurality of mounting positions. Each mounting position is equipped with a positioning clamp 2 for fixing a workpiece. A connection panel 3 is installed on the top of the box body 1, and each positioning clamp 2 is provided with a through hole so that the clamp jaw of the positioning clamp 2 can be exposed. A support frame 4 is detachably connected to each through hole for carrying the workpiece and can be replaced according to the size requirements of the corresponding workpiece.

[0025] As Figure 3 、 4 shown, the positioning clamp 2 includes two separable clamp jaws 21 and two cylinders 22 for synchronously driving the opening and closing of the clamp jaws 21. When the two clamp jaws 21 are closed, a heat dissipation substrate accommodation space is formed. A positioning groove 211 is provided on a wall surface of the heat dissipation substrate accommodation space perpendicular to the separation direction of the clamp jaws. The positioning groove 211 matches the pins of the heat dissipation substrate and is used to control the centering positioning of the workpiece in the X direction. After the two clamp jaws 21 are closed, the centering positioning of the workpiece in the Y direction is controlled.

[0026] The top of the cylinder 22 is provided with a crank installation cavity. Two cranks 23 are rotatably connected in the crank installation cavity, and one end of each of the two cranks 23 is hinged to the piston rod 24 of the cylinder 22; the two clamp jaws 21 are slidably connected to the top of the crank installation cavity, and the other end of each crank 23 is respectively hinged to the bottom surface of a clamp jaw 21. The clamp jaws 21 are detachably connected and can be suitable for the clamp jaws according to the size requirements of the workpiece.

[0027] Based on the above structure, when the piston rod 23 extends upward, the end of the crank 23 in the crank installation cavity is lifted, causing the connection end of the crank 23 and the clamp jaw 21 to rotate outward, thereby driving the two clamp jaws 21 to slide outward to achieve the separation of the clamp jaws; when the piston rod 23 contracts downward, the end of the crank 23 in the crank installation cavity moves downward, causing the connection end of the crank 23 and the clamp jaw 21 to rotate inward, thereby driving the two clamp jaws 21 to slide inward to achieve the closing of the clamp jaws.

[0028] On one side of the box body 1, there is an air valve switch 5 and a vacuum switch 6. The air valve switch 5 is connected to an air compressor and each cylinder 22, and is used to control the telescopic movement of the cylinder 22. There are air holes on the jaw 21, and the air holes are communicated with the inner cavity of the box body 1. The vacuum switch 6 is connected to a negative pressure mechanism and can control the opening of the negative pressure. The workpiece placed on the support frame 4 can be adsorbed by the negative pressure in the air holes, so as to realize the fixation of the workpiece in the Z direction.

[0029] It should be noted that the air hole can be a through hole provided in the middle of the jaw 21, or a semi-hole provided at the edge of the jaw 21. In this embodiment, the latter is preferably selected.

[0030] The usage method of the present utility model is as follows:

[0031] First, open the positioning pliers 2 through the air valve switch 5; then, place the workpiece with the pins facing down on the support frame 4, and align the pins of the workpiece with the positioning grooves 211 of the jaw 21. The positioning grooves 211 can limit the freedom degree of the pins of the workpiece in the X direction and realize the centering function in the X direction; then, close the positioning pliers 2 through the air valve switch 5, and the positioning pliers realize the centering function of the workpiece in the Y direction; finally, open the vacuum switch 6, and the negative pressure will adsorb the workpiece through the air holes to realize the fixation of the workpiece in the Z direction.

[0032] The above is only the preferred embodiment of the present utility model and is not used to limit the present utility model. Although the present utility model has been described in detail with reference to the embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacement on some of the technical features. However, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. An IGBT heat dissipation substrate centering fixture, characterized in that: It comprises a positioning pliers, which comprises two openable and closable jaws and a cylinder, wherein when the two jaws are closed, a accommodating space for accommodating the pins of the heat dissipation substrate is formed, and a positioning groove is provided on the wall of the accommodating space perpendicular to the separation direction of the jaws, and the positioning groove matches the pins of the heat dissipation substrate, and at least one of the jaws is provided with an air hole, which is connected to a negative pressure mechanism; a crank mounting cavity is provided on the top of the cylinder, and two cranks are rotatably connected in the crank mounting cavity, and one end of the two cranks is hinged to the piston rod of the cylinder; the two jaws are detachably and slidably connected to the top of the crank mounting cavity, and the other end of each crank is hinged to the bottom surface of one of the jaws.

2. The IGBT heat dissipation substrate centering fixture according to claim 1, characterized in that: It also includes a box body, the positioning clamp is arranged in the box body, the top of the box body is provided with a through hole exposing the jaws, and one side of the box body is provided with an air valve switch and a vacuum switch, the air valve switch connects the air compressor and the cylinder, and the vacuum switch connects the air hole and the negative pressure mechanism.

3. The IGBT heat dissipation substrate centering fixture according to claim 2, characterized in that: A plurality of positioning clamps are arranged in the box body.

4. The IGBT heat dissipation substrate centering fixture according to claim 3, characterized in that: The box body is a top-opening structure, a connection panel is arranged on the top of the box body, and the via hole is arranged on the connection panel.

5. The IGBT heat dissipation substrate centering fixture according to claim 4, characterized in that: A detachable supporting frame is provided on the via hole.

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