Positioning clamp for special-shaped workpiece

Abstract

The special-shaped workpiece comprises a body and a base which are fixedly connected with each other, the base comprises a first bottom face located at the bottom and two first abutting parts located on the opposite sides respectively, and the positioning clamp comprises a fixing plate, a first clamping plate, a second clamping plate and a second clamping plate, and the fixing plate is provided with an installation part used for being attached to the first bottom face; and the two movable arms are located on the opposite sides of the special-shaped workpiece respectively, second abutting parts are arranged on the movable arms, and the movable arms can move in the direction towards or away from the fixed plate so that the second abutting parts can abut against or be separated from the first abutting parts. According to the center hole machining device, the two movable arms are arranged on the two sides of the base respectively, when the two movable arms abut against the two sides of the base, the base can be clamped and the body can be straightened at the same time, and the center line of a machined center hole is made to be perpendicular to the side face of the body.

Description

Technical Field

[0001] The utility model relates to the technical field of clamps, in particular to a positioning clamp for special-shaped workpieces. Background Art

[0002] Existing clamps all clamp or release the workpiece by moving a plurality of clamp arms closer to or farther from each other.

[0003] However, these fixtures only have the functions of clamping and rough positioning, and cannot achieve precise positioning of the workpiece, especially for the clamping of special-shaped workpieces. Due to the irregular shape of the workpiece, it is difficult to achieve stable clamping and precise positioning. When the workpiece is not accurately positioned, there will be errors in the processed holes and surfaces. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to propose a positioning fixture for special-shaped workpieces, which is used to solve the problem that the fixture in the prior art cannot achieve precise positioning, resulting in errors in the processed holes and surfaces.

[0005] The technical solution adopted by the utility model to solve the technical problem is a positioning fixture for a special-shaped workpiece, the special-shaped workpiece includes a body and a base fixed to each other, the base includes a first bottom surface at the bottom and two first abutment portions respectively located on opposite sides, the positioning fixture includes:

[0006] A fixing plate, wherein the fixing plate is provided with a mounting portion for abutting against the first bottom surface;

[0007] Two movable arms are respectively located at opposite sides of the special-shaped workpiece, and a second abutment portion is provided on the movable arm. The movable arm can move toward or away from the fixed plate to make the second abutment portion abut against or separate from the first abutment portion.

[0008] Furthermore, the first abutting portion is provided with a first inclined surface, and the first inclined surface gradually inclines inwardly along the direction of the base toward the main body;

[0009] The second abutting portion is provided with a second inclined surface, and the second inclined surface gradually tilts inwardly along the direction of the fixed plate toward the movable arm. The movable arm moves toward the fixed plate to drive the second inclined surface to fit with the first inclined surface.

[0010] Furthermore, the mounting portion is recessed inwardly to form a mounting hole, and the base can extend into the mounting hole.

[0011] Furthermore, the mounting hole has a second bottom surface, the first bottom surface can be in contact with the second bottom surface, and the side surface of the base can be in contact with the inner wall of the mounting hole.

[0012] Furthermore, it also includes:

[0013] A chuck, the fixing plate being arranged on the chuck;

[0014] The movable plate is movably mounted on the fixed plate, and the two movable arms are simultaneously fixedly connected to the movable plate.

[0015] Furthermore, the movable arm has an open end and a connecting end, the connecting ends of the two movable arms are fixedly connected to the fixing plate, and there is a space between the open ends of the two movable arms to allow the special-shaped workpiece to pass through.

[0016] Compared with the prior art, the utility model has at least the following beneficial effects:

[0017] Two movable arms are arranged on both sides of the base respectively. When the two movable arms abut against both sides of the base, they can clamp the base and straighten the body at the same time, so that the center line of the processed center hole is perpendicular to the side of the body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the positioning fixture in the embodiment;

[0019] Figure 2 A schematic diagram of the structure of the movable plate and the fixed plate in the embodiment;

[0020] Figure 3 A schematic diagram of the structure of a workpiece in the embodiment;

[0021] In the figure:

[0022] 100, workpiece; 110, body; 111, center hole; 120, base; 121, first inclined surface; 122, first bottom surface;

[0023] 200, fixing plate; 210, mounting hole;

[0024] 300, movable plate; 310, movable arm; 311, second inclined surface. DETAILED DESCRIPTION

[0025] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0026] Please refer to Figure 1-Figure 3The utility model discloses a positioning fixture for a special-shaped workpiece, wherein the special-shaped workpiece 100 comprises a body 110 and a base 120 fixed to each other, wherein the base 120 comprises a first bottom surface 122 at the bottom and two first abutting portions respectively at opposite sides, and the positioning fixture comprises:

[0027] A fixing plate 200, wherein the fixing plate 200 is provided with a mounting portion for contacting with the first bottom surface 122;

[0028] Two movable arms 310 are respectively located at opposite sides of the special-shaped workpiece 100. A second abutment portion is provided on the movable arm 310. The movable arm 310 can move toward or away from the fixed plate 200 to make the second abutment portion abut against or separate from the first abutment portion.

[0029] Specifically, the present application sets a mounting portion on the fixed plate 200, and the mounting portion is connected to the first bottom surface 122. At the same time, two movable arms 310 are also provided. When the workpiece 100 is placed on the mounting portion, the two movable arms 310 move toward the fixed plate 200 to abut against the two first abutting portions. When the two second abutting portions abut against the two first abutting portions, the entire workpiece 100 can be straightened, and the workpiece 100 can be clamped and accurately positioned at the same time, thereby improving the processing accuracy.

[0030] like Figure 3 As shown, the special-shaped workpiece 100 to be processed in the present application includes a body 110 and a base 120. The processed part is the center hole 111 on the body 110. The central axis of the center hole 111 needs to be perpendicular to the side. Therefore, after clamping, the workpiece 100 cannot be offset to the left or right. Based on this, two movable arms 310 are respectively arranged on both sides of the base 120. When the two movable arms 310 abut against both sides of the base 120, the base 120 can be clamped and the body 110 can be straightened at the same time, so that the center line of the processed center hole 111 is perpendicular to the side of the body 110.

[0031] Furthermore, the first abutting portion is provided with a first inclined surface 121, and the first inclined surface 121 gradually inclines inwards along the base 120 toward the main body 110;

[0032] The second abutting portion is provided with a second inclined surface 311 , which gradually tilts inwards along the fixing plate 200 toward the movable arm 310 . The movable arm 310 moves toward the fixing plate 200 to drive the second inclined surface 311 to fit with the first inclined surface 121 .

[0033] Specifically, the automatic straightening process of the clamp of the present application is as follows: when the workpiece 100 is tilted, the two movable arms 310 move toward the fixed plate 200, and the second inclined surface 311 on one of the movable arms 310 first abuts against one of the first inclined surfaces 121. As the movable arm 310 continues to move, the second inclined surface 311 abuts against the first inclined surface 121 and drives the workpiece 100 to rotate a certain angle until the two second inclined surfaces 311 are both in contact with the first inclined surface 121. At this time, the workpiece 100 no longer rotates, and the two movable arms 310 lock the workpiece 100, thereby completing the clamping and automatic straightening of the workpiece 100.

[0034] Furthermore, the mounting portion is recessed inwardly to form a mounting hole 210 , and the base 120 can extend into the mounting hole 210 .

[0035] The mounting hole 210 has a second bottom surface, the first bottom surface 122 can be attached to the second bottom surface, and the side surface of the base 120 can be attached to the inner wall of the mounting hole 210 .

[0036] A mounting hole 210 is provided in the mounting portion so that the base 120 can be partially sunk into the mounting hole 210. When the base 120 extends into the mounting hole 210, the side wall (side edge) of the mounting hole 210 will abut against the side wall of the base 120 and roughly correct the angle of the workpiece 100, thereby preventing the workpiece 100 from being greatly offset before being straightened by the movable arm 310.

[0037] At the same time, the installation hole 210 is provided to limit the base 120 to prevent the base 120 from shaking during the processing.

[0038] Furthermore, it also includes:

[0039] A chuck, on which the fixing plate 200 is disposed;

[0040] The movable plate 300 is movably mounted on the fixed plate 200 , and the two movable arms 310 are fixedly connected to the movable plate 300 at the same time.

[0041] Specifically, the two movable arms 310 are fixed to the same movable plate 300 , and the two movable arms 310 can be synchronously moved by simply driving the movable plate 300 to move, thereby preventing the two movable arms 310 from moving asynchronously and causing the workpiece 100 to deviate.

[0042] Furthermore, there is a gap between the movable plate 300 and the fixed plate 200, and a locking bolt passes through the movable plate 300 and the fixed plate 200 at the same time. By tightening the locking bolt, the movable plate 300 can drive the two movable arms 310 to lock the workpiece 100. Of course, a screw rod can also be set on the movable plate 300, and the screw rod can be rotated by a motor or manpower to drive the movable plate 300 to move, and finally drive the movable arms 310 to lock the workpiece 100.

[0043] Furthermore, the movable arm 310 has an open end and a connecting end. The connecting ends of the two movable arms 310 are fixedly connected to the fixing plate 200 . There is a space between the open ends of the two movable arms 310 to allow the special-shaped workpiece 100 to pass through.

[0044] Specifically, since the thickness of the base 120 is greater than the thickness of the main body 110, the workpiece 100 cannot pass the base 120 from top to bottom between the two movable arms 310, and due to the obstruction of the fixed plate 200, the workpiece 100 cannot pass the main body 110 from bottom to top between the two movable arms 310. Therefore, the movable plate 300 needs to be removed each time before the workpiece 100 can be installed, which is cumbersome.

[0045] Based on this, the present application sets openings at the ends of the two movable arms 310 so that the body 110 can enter between the two movable arms 310 from the side (open end) without disassembling the movable plate 300, thereby reducing the installation steps.

[0046] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0047] In addition, in the present invention, the descriptions of "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A positioning fixture for a special-shaped workpiece, the special-shaped workpiece comprising a body and a base fixed to each other, the base comprising a first bottom surface at the bottom and two first abutment portions respectively at opposite sides, characterized in that: The positioning fixture comprises: A fixing plate, wherein the fixing plate is provided with a mounting portion for abutting against the first bottom surface; Two movable arms are respectively located at opposite sides of the special-shaped workpiece, and a second abutment portion is provided on the movable arm. The movable arm can move toward or away from the fixed plate to make the second abutment portion abut against or separate from the first abutment portion.

2. A positioning fixture for special-shaped workpieces according to claim 1, characterized in that: The first abutting portion is provided with a first inclined surface, and the first inclined surface gradually inclines inwardly along the direction of the base toward the main body; The second abutting portion is provided with a second inclined surface, and the second inclined surface gradually tilts inwardly along the direction of the fixed plate toward the movable arm. The movable arm moves toward the fixed plate to drive the second inclined surface to fit with the first inclined surface.

3. A positioning fixture for special-shaped workpieces according to claim 1, characterized in that: The mounting portion is recessed inwardly to form a mounting hole, and the base can extend into the mounting hole.

4. A positioning fixture for special-shaped workpieces according to claim 3, characterized in that: The mounting hole has a second bottom surface, the first bottom surface can be attached to the second bottom surface, and the side surface of the base can be attached to the inner wall of the mounting hole.

5. A positioning fixture for special-shaped workpieces according to claim 1, characterized in that: Also includes: A chuck, the fixing plate being arranged on the chuck; The movable plate is movably mounted on the fixed plate, and the two movable arms are simultaneously fixedly connected to the movable plate.

6. A positioning fixture for special-shaped workpieces according to claim 5, characterized in that: The movable arm has an open end and a connecting end. The connecting ends of the two movable arms are fixedly connected to the fixing plate. There is a space between the open ends of the two movable arms to allow the special-shaped workpiece to pass through.

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