Multi-positioning disassembly-free clamping fixture

Abstract

According to the multi-positioning disassembly-free clamping fixture, a fixture block A is a clamping block with a positioning shaft, the clamping block is of an integral structure, the positioning shaft and a workpiece positioning hole can be conveniently positioned and clamped, the positioning shaft is cylindrical, and the top end of the positioning shaft is in an arc R shape; the clamp block B is a clamp block without a positioning shaft, and the clamp block is of an integral structure, is integrally flat, is consistent with the clamp block A in size, and can be tightly attached to a workpiece to guarantee machining under the clamping of a vice; the vice is used for being matched with the clamp block A and the clamp block B and is positioned on equipment at the same time, it is guaranteed that a workpiece is tightly locked during machining, and machining is achieved. Compared with an original conventional single-process clamping clamp, the clamp has the advantages of being easy to assemble, convenient to disassemble, uniform in positioning and capable of achieving multi-direction clamping and multi-working-face machining of workpieces, adaptability is greatly improved, machining cost and time of the clamp can be reduced, meanwhile, due to the fact that positioning reference is uniform, machining precision is improved, and machining efficiency is improved. And the workpiece consistency and the machining efficiency can be improved to a great extent.

Description

Technical Field

[0001] The utility model relates to a multi-position non-detachable clamping fixture, belonging to the field of machining of mechanical parts. Background Art

[0002] According to different forming processes, hard aluminum plates (rods) can be selected for machining of the housing by mechanical processing, or forged aluminum can be cold-extruded and cast aluminum can be die-cast for forming. Most of the machining of the housing adopts equipment such as numerical control machine tools or machining centers. Compared with the traditional single-process machine tool machining, these equipment reduce the number of clamping times of parts, and complete the workload that used to require multiple machine tools on the same equipment according to the predetermined programming. This not only improves the part accuracy, but also saves equipment and man-hours, and greatly improves the production efficiency. Milling is a common machining method for housing connector parts. When machining workpieces on a milling machine, the commonly used clamping methods include direct clamping on the workbench, clamping with a vise, clamping with a dividing head, clamping with a V-block, clamping with a special fixture, etc. Different clamping methods adopt different machining methods, and there are obvious differences in the states of the parts after milling. Content of the Utility Model

[0003] The technical problems to be solved by the utility model are the single positioning function, low consistency and low dimension guarantee ability existing in the design of traditional fixtures.

[0004] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0005] A multi-position non-detachable clamping fixture includes a fixture block A, a fixture block B and a vise;

[0006] The fixture block A is a clamping block with a positioning shaft. The clamping block is of an integral structure. The positioning shaft is machined in one time during processing to ensure the overall accuracy. The positioning shaft is convenient for positioning and clamping with the positioning hole of the workpiece. The positioning shaft is cylindrical, and the top end is in an arc R shape, which is convenient for the assembly and separation of the workpiece and the fixture;

[0007] The fixture block B is a clamping block without a positioning shaft. The clamping block is of an integral structure and is flat as a whole. It has the same size as the fixture block A and provides a force-bearing support during clamping. Under the clamping of the vise, it can be closely attached to the workpiece to ensure machining;

[0008] The vise is used to cooperate with the fixture block A and the fixture block B, and is positioned on the equipment at the same time to ensure that the workpiece is tightly locked during machining to realize machining.

[0009] The beneficial effects of adopting the above technical scheme are:

[0010] Compared with the original conventional single - process clamping fixture, the fixture provided by the present invention has the advantages of simple assembly, convenient disassembly, unified positioning, multi - direction clamping of workpieces, and multi - working - surface processing, greatly increasing the adaptability, reducing the fixture processing cost and time. At the same time, due to the unified positioning reference, the workpiece consistency and processing efficiency can be improved to a great extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic structural diagram of the multi - positioning and non - detachable clamping fixture of the present invention.

[0012] In the figure: 1 - clamping block A, 2 - clamping block B, 3 - vise, 4 - workpiece.

[0013] Figure 2 is Figure 1 a schematic structural diagram of the clamping block A in it.

[0014] In the figure: 5 - positioning shaft.

[0015] Figure 3 is Figure 2 front view.

[0016] Figure 4 is Figure 2 top view.

[0017] Figure 5 is Figure 2 left view.

[0018] Figure 6 is Figure 1 a schematic structural diagram of the clamping block B in it.

[0019] Figure 7 is Figure 6 top view.

[0020] Figure 8 is Figure 6 left view. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] A multi - positioning and non - detachable clamping fixture includes a clamping block A1, a clamping block B2 and a vise 3;

[0023] The fixture block A1 is a fixture block with a positioning shaft 5. The fixture block is an integral structure. The positioning shaft 5 is formed in one step during processing to ensure overall accuracy. The positioning shaft is convenient for positioning and clamping with the workpiece positioning hole. The positioning shaft 5 is cylindrical, and the top end is in an arc R shape, which is convenient for assembling and separating the workpiece 4 from the fixture.

[0024] The clamp block B2 is a clamp block without a positioning shaft. The clamp block is an integral structure, which is flat as a whole and has the same size as the clamp block A1. It provides force support during clamping. When clamped by the vise 3, it can be closely attached to the workpiece 4 to ensure processing.

[0025] The vise 3 is used to cooperate with the clamp block A1 and the clamp block B2, and is positioned on the equipment at the same time to ensure that the workpiece is tightly locked during processing to achieve processing.

[0026] Material selection: The fixture block A1 mainly plays the role of positioning and locking the workpiece. There is a positioning shaft 5 on the fixture block. The fixture block B2 mainly plays the role of locking the workpiece. Both require a certain degree of yield resistance, and at the same time require low cost and easy processing. The most common aluminum alloy in the production site is 2A12, so ordinary 2A12 aluminum alloy can be used. The vise 3 mainly realizes the fixing and locking of the fixture, and at the same time realizes the rigid connection with the equipment. Conventional vises on the market can achieve this function, so there is no special requirement for the material of the vise.

[0027] Structural parameters: The overall dimensions of the fixture are designed based on the corresponding workpiece shape, usually increasing by 20 to 30 mm on the basis of the workpiece dimensions. If the overall design of the fixture is too small, the workpiece will be unable to be clamped in the vise due to the workpiece shape pressing against the bottom of the vise when clamping; if the fixture is too large, the two sides will be too much higher than the workpiece size, and the tool length will be insufficient during processing, and it will be impossible to process to the bottom of the workpiece; a positioning shaft 5 is designed on the fixture block A1, and the positioning shaft 5 is designed to match the size of the positioning hole of the workpiece 4, and a clearance fit is adopted, usually increasing the aperture size by 0.01 to 0.02 mm. If the clearance is designed to be too small, friction and extrusion will occur between the positioning shaft 5 and the positioning hole of the workpiece 4, resulting in loss of the positioning hole; if the clearance is designed to be too large, shaking will occur between the positioning shaft 5 and the positioning hole of the workpiece 4, resulting in inaccurate positioning of the parts, or displacement during processing, resulting in poor consistency of the workpiece 4.

[0028] The overall structure and dimensions of the fixture block A1 are as follows: Figure 3 , Figure 4 , Figure 5As shown, it should be set according to the corresponding workpiece. To ensure that the workpiece can be completely processed without interference during clamping, the fixture block A1 should not deform under force. Therefore, the total thickness A should be at least ≥30mm. Since the workpiece is clamped both horizontally and vertically during clamping, the total width B should be determined by the maximum horizontal positioning dimension X1, the maximum vertical positioning dimension L1, and the clearance allowance, that is, B = L1 + X1 + clearance allowance. When designing this fixture, it can be universal for at least 3 or more workpieces. Therefore, the total length C should be determined by the horizontal positioning dimensions L1, L2, and L3 of the three workpieces and the clearance allowance, that is, C = L1 + L2 + L3 + clearance allowance. Limited by the size of the equipment's own workbench surface and the best range for maintaining consistent clamping force of the vise, C should be ≤150mm for the best. The positioning shaft 5 on the fixture block A1 is designed according to the positioning hole size of the workpiece 4. Usually, it is sufficient to increase the hole diameter size by 0.01 - 0.02mm. If the clearance is designed too small, there will be frictional extrusion between the positioning shaft 5 and the positioning hole of the workpiece 4, resulting in loss of the positioning hole. If the clearance is designed too large, there will be play between the positioning shaft and the positioning hole of the workpiece, resulting in inaccurate part positioning or displacement during the processing, resulting in poor workpiece consistency.

[0029] The described fixture block B2 has an outer dimension as Figure 6 , Figure 7 , Figure 8 shown. It should be set according to the fixture block A1. The main function of the fixture block B2 is to fix the workpiece under force during clamping. Therefore, only its surface needs to be smooth and the flatness should be ≤0.03mm. The fixture block -02 should not deform under force. Therefore, the total thickness A1 should be at least ≥30mm, and the other dimensions B1 and C1 are the same as the B and C dimensions in the fixture block -01.

[0030] A method for using a multi-positioning non-detachable clamping fixture includes the following steps:

[0031] A) First, assemble the vise 3 on the equipment and fix it with bolts to ensure that the vise 3 is stable under force;

[0032] B) Assemble the fixture block A1, the fixture block B2, and the vise 3 as Figure 1 shown;

[0033] C) Align the positioning hole of the workpiece 4 to be processed with the positioning shaft on the fixture block A1, and lock and fix the fixture block B2 and the vise 3;

[0034] D) After the workpiece is processed, loosen the fixture block B2 and the vise 3, and remove the workpiece 4.

[0035] When this fixture is in use, the workpiece is positioned by fitting the positioning hole with the positioning shaft 5 on the fixture block A1. The fixture block B2 is closely attached to the workpiece under the action of the vise 3 to achieve the clamping and fixing of the workpiece, asFigure 1 as shown

[0036] After the machining is completed, loosen the vise 3. The fixture block B2 will loosen naturally as the vise 3 loosens. At this time, the workpiece 4 is no longer under force, and the positioning hole is disengaged from the positioning shaft 4, realizing the picking and placing of the workpiece 4.

[0037] The positioning shaft 5 of the present utility model is a precise positioning and quick-release fixture integrated according to the hole diameters of similar parts. One fixture can machine multiple parts, with multiple working stations. At the same time, it also restricts the six degrees of freedom of the parts. As long as the movable jaw of the vise slightly holds the part, it can prevent the part from moving and rotating. Its main purpose is the positioning machining of multi-process parts and thin-walled cavity parts with high requirements for repeated positioning accuracy.

Claims

1. A multi-positioning, non-disassembly clamping fixture, characterized in that: It includes a fixture block A (1), a fixture block B (2) and a vise (3); The fixture block A (1) is a fixture block with a positioning shaft (5). The fixture block is an integral structure. The positioning shaft (5) is formed in one step during processing to ensure overall accuracy. The positioning shaft is convenient for positioning and clamping with the positioning hole of the workpiece. The positioning shaft (5) is cylindrical and has an arc R-shaped top end, which facilitates assembly and separation of the workpiece (4) and the fixture. The clamp block B (2) is a clamp block without a positioning shaft. The clamp block is an integral structure, is flat as a whole, and has the same size as the clamp block A (1). It provides force support during clamping. When clamped by the vise (3), it can be closely attached to the workpiece (4) to ensure processing. The vise (3) is used to cooperate with the fixture block A (1) and the fixture block B (2), and is positioned on the equipment at the same time, so as to ensure that the workpiece is tightly locked during processing and realize processing.

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