CN222958052U - A multi-positioning, non-disassembly clamping fixture - Google Patents

Abstract

A multi-positioning, disassembly-free clamping fixture, wherein the fixture block A is a clamping block with a positioning shaft, and the clamping block is an integral structure. The positioning shaft is convenient for positioning and clamping with the positioning hole of the workpiece, and the positioning shaft is cylindrical, and the top end is in an arc R shape; the fixture block B is a clamping block without a positioning shaft, and the clamping block is an integral structure, which is flat as a whole and consistent in size with the fixture block A. Under the clamping of the vise, it can be tightly attached to the workpiece to ensure processing; 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 processing to achieve processing. Compared with the original conventional single-process clamping fixture, the fixture provided by the utility model has the advantages of simple assembly, convenient disassembly, unified positioning, and can realize multi-directional clamping of the workpiece and multi-working surface processing, which greatly increases the adaptability and can reduce the cost and time of fixture processing. At the same time, due to the unified positioning reference, it can greatly improve the consistency of the workpiece and the processing efficiency.

Description

Multi-positioning disassembly-free clamping fixture

Technical Field

The utility model relates to a multi-positioning disassembly-free clamping fixture, and belongs to the field of machining of mechanical parts.

Background

The shell is formed by machining a hard aluminum plate (rod) or cold extrusion of forged aluminum and die casting of cast aluminum according to different forming processes. The shell machining mostly adopts equipment such as a numerical control machine tool or a machining center, and compared with the traditional single-procedure machine tool machining, the equipment reduces the clamping times of parts, finishes the workload which can be finished by a plurality of machine tools in the past on the same equipment according to the preset programming, improves the precision of the parts, saves the equipment and working hours, and greatly improves the production efficiency. The milling processing is a common processing method of shell connector parts, and when a workpiece is processed on a milling machine, the clamping modes adopted commonly include methods such as direct clamping of a workbench, parallel vice clamping, dividing head clamping, V-shaped frame clamping, special fixture clamping and the like, the processing modes adopted by different clamping modes are inconsistent, and the states of the parts after milling processing are also obviously different.

Disclosure of utility model

The utility model aims to solve the technical problems of single positioning function, low consistency and low size guarantee capability in the traditional clamp design.

In order to solve the technical problems, the utility model adopts the following technical scheme:

A multi-positioning disassembly-free clamping fixture comprises a fixture block A, a fixture block B and a vice;

The clamp block A is a clamp block with a positioning shaft, the clamp block is of an integral structure, the positioning shaft is formed by one-step machining during machining, the integral precision is guaranteed, the positioning shaft is convenient to position and clamp with a workpiece positioning hole, the top end of the positioning shaft is cylindrical, and the top end of the positioning shaft is in an arc R shape, so that the workpiece and the clamp can be conveniently assembled and separated;

the clamp block B is a clamp block without a positioning shaft, is of an integral structure, is integrally flat and consistent with the clamp block A in size, provides stressed support for clamping, and can be tightly attached to a workpiece under the clamping of a vice to ensure the processing;

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, so that the workpiece is tightly locked during processing, and the processing is realized.

The beneficial effects of adopting above-mentioned technical scheme are:

Compared with the original conventional single-process clamping fixture, the fixture provided by the utility model has the advantages of simplicity in assembly, convenience in disassembly, unification in positioning, capability of realizing multidirectional clamping of workpieces and machining of multiple working surfaces, greatly increases the adaptability, can reduce the machining cost and time of the fixture, and can improve the consistency and the machining efficiency of the workpieces to a great extent due to unification of positioning references.

Drawings

FIG. 1 is a schematic diagram of a multi-positioning disassembly-free clamping fixture.

In the figure, a 1-clamp block A, a 2-clamp block B, a 3-vice and a 4-workpiece are shown.

Fig. 2 is a schematic structural view of the clamp block a in fig. 1.

In the figure, 5-position axis.

Fig. 3 is a front view of fig. 2.

Fig. 4 is a top view of fig. 2.

Fig. 5 is a left side view of fig. 2.

Fig. 6 is a schematic view of the structure of the clamp block B in fig. 1.

Fig. 7 is a top view of fig. 6.

Fig. 8 is a left side view of fig. 6.

Detailed Description

For the purpose of promoting an understanding of the principles of the utility model, reference will now be made in detail to the embodiments described herein, including examples, illustrated in the accompanying drawings.

A multi-positioning disassembly-free clamping fixture comprises a fixture block A1, a fixture block B2 and a vice 3;

The fixture block A1 is a clamping block with a positioning shaft 5, the clamping block is of an integral structure, the positioning shaft 5 is formed by one-step machining during machining, the integral precision is guaranteed, the positioning shaft is convenient to position and clamp a workpiece positioning hole, the positioning shaft 5 is cylindrical, the top end of the positioning shaft is in an arc R shape, and the workpiece 4 is convenient to assemble and separate from the fixture;

The clamp block B2 is a clamp block without a positioning shaft, is of an integral structure, is integrally flat and consistent with the clamp block A1 in size, provides stressed support for clamping, and can be tightly attached to the workpiece 4 under the clamping of the vice 3 to ensure the processing;

the vice 3 is used for being matched with the clamp block A1 and the clamp block B2, and is positioned on equipment at the same time, so that a workpiece is tightly locked during machining, and machining is realized.

The material selection is that the clamp block A1 mainly plays a role in workpiece positioning and locking, the clamp block is provided with the positioning shaft 5, the clamp block B2 mainly plays a role in workpiece locking, both the clamp block A1 and the clamp block B are required to have certain yield resistance, meanwhile, the cost is low, the processing is facilitated, and the common production site is 2A12 aluminum alloy, so that the common 2A12 aluminum alloy is selected. The vice 3 mainly realizes the fixation and locking of the clamp and the rigid connection with the equipment, and the conventional vice on the market can realize the function, so the material of the vice is not required to be special.

The structure parameters include that the overall appearance size of the clamp is designed based on the appearance of a corresponding workpiece, 20-30 mm is usually added on the basis of the appearance size of the workpiece, if the overall appearance size of the clamp is too small, the clamp cannot be clamped on a vice due to the fact that the appearance of the workpiece abuts against the bottom of the vice during clamping, if the appearance of the workpiece is too large, the two sides of the clamp are higher than the size of the workpiece, the tool length is insufficient during machining, the bottom of the workpiece cannot be machined, a positioning shaft 5 is designed on a clamp block A1, the positioning shaft 5 is designed according to the size matching of a positioning hole of the workpiece 4, clearance fit is adopted, the aperture size is usually increased by 0.01-0.02 mm, friction extrusion is generated between the positioning shaft 5 and the positioning hole of the workpiece 4, positioning hole loss is caused, and if the clearance design is too large, vibration is generated between the positioning shaft 5 and the positioning hole of the workpiece 4, positioning inaccuracy is caused, or displacement is generated during machining, and consistency of the workpiece 4 is poor.

The overall structure and the dimension of the clamp block A1 are as shown in fig. 3, 4 and 5, the clamp block A1 should be set according to corresponding workpieces, in order to ensure that the workpieces can be completely machined and clamped without interference, the clamp block A1 should not deform when stressed, so that the total thickness A should be at least more than or equal to 30mm, the transverse and longitudinal clamping are adopted during workpiece clamping, so that the total width B should be determined by the maximum transverse positioning dimension X1, the maximum longitudinal positioning dimension L1 and the clearance allowance, namely B=L1+X1+clearance allowance, the clamp design can realize the universality of at least more than 3 workpieces, so that the transverse positioning dimensions L1, L2 and L3 of the three workpieces and the clearance allowance are determined together when the total length C should be ensured, namely C=L1+L2+L3+clearance allowance, the clamp block A1 should be limited by the optimal interval that the size of the working table top of the equipment is consistent with the clamping force of a vice, C should be 150mm, the positioning shaft 5 on the clamp block A1 should be designed according to the positioning hole dimension of the workpiece 4, namely, the positioning hole is increased by 0.01-0.020.020.02mm, the positioning hole is formed in the aperture dimension, if the positioning hole is not consistent with the positioning hole is formed, and the positioning hole is poor, if the positioning hole is not consistent is formed, and the positioning hole is generated, the positioning hole is poor, and the positioning hole is caused.

The external dimension of the clamp block B2 is shown in fig. 6, 7 and 8, and is set according to the clamp block A1, the clamp block B2 mainly aims to fix the workpiece under force during clamping, so that the workpiece is only required to be kept smooth, the flatness is less than or equal to 0.03mm, the clamp block-02 is required to be not deformed under force, the total thickness A1 is required to be at least more than or equal to 30mm, and the dimensions of the rest B1 and C1 are consistent with the dimensions of B and C in the clamp block-01.

The application method of the multi-positioning disassembly-free clamping fixture comprises the following steps:

a) Firstly, assembling the vice 3 on equipment, and fixing by adopting bolts to ensure that the vice 3 is stressed stably;

B) Assembling the clamp block A1, the clamp block B2 and the vice 3 as shown in FIG. 1;

C) Positioning a positioning hole of a workpiece 4 to be processed and a positioning shaft on a clamp block A1, and locking and fixing a clamp block B2 and a vice 3;

d) After the workpiece is machined, the clamp block B2 and the vice 3 are loosened, and the workpiece 4 is taken down.

When the clamp is used, a workpiece is positioned in an adaptive manner through the positioning hole and the positioning shaft 5 on the clamp block A1, the clamp block B2 is tightly attached to the workpiece under the action of the vice 3, and the clamping and fixing of the workpiece are realized, as shown in figure 1.

After the machining is finished, the vice 3 is loosened, the clamp block B2 is loosened naturally along with the loosening of the vice 3, at the moment, the workpiece 4 is not stressed any more, and the positioning hole is separated from the positioning shaft 4, so that the workpiece 4 is taken and placed.

The positioning shaft 5 is an integral accurate positioning quick-release clamp for precisely positioning according to the hole diameters of similar parts, one clamp can process a plurality of parts, multiple stations are realized, six degrees of freedom of the parts are limited, the parts can be prevented from moving and rotating only by slightly propping up the parts by the movable jaw of the vice, and the positioning shaft is mainly used for positioning and processing the parts with multiple working positions and thin-wall cavity parts with high repeated positioning precision requirements.

Claims (1)

1. The multi-positioning disassembly-free clamping fixture is characterized by comprising a fixture block A (1), a fixture block B (2) and a vice (3);

The fixture block A (1) is a clamping block with a positioning shaft (5), the clamping block is of an integral structure, the positioning shaft (5) is formed by one-step machining during machining, the integral precision is guaranteed, the positioning shaft is convenient to position and clamp a workpiece positioning hole, the positioning shaft (5) is cylindrical, the top end of the positioning shaft is in an arc R shape, and the workpiece (4) is convenient to assemble and separate from the fixture;

The clamp block B (2) is a clamp block without a positioning shaft, is of an integral structure, is integrally flat and consistent with the clamp block A (1) in size, provides stressed support for clamping, and can be tightly attached to a workpiece (4) under the clamping of the vice (3) to ensure the processing;

The vice (3) is used for being matched with the clamp block A (1) and the clamp block B (2), and is positioned on equipment at the same time, so that a workpiece is tightly locked during machining, and machining is realized.