CN204843624U - Gearbox crank special fixture - Google Patents

Abstract

The utility model discloses a gearbox crank special fixture, comprises a clamp body, the anchor clamps bodies on install two relative " Z " type briquettings, the anchor clamps bodies on be equipped with respectively with the crank part on the part hole put corresponding location pinhole and diamond pin hole with side locating plate hole site, the anchor clamps bodies on still be equipped with the cushion, the cushion on be fixed with the feeler block. The utility model discloses use " Z " type briquetting and locating pin, diamond pin to fix a position crank part back plane and concentric reducer hole, can restrict six degrees of freedom of work piece, reach positioned exactly, should both increase the stability of work piece by " two round pins of one side " positioning design, take into account benchmark coincidence principle again, the good location of realizing anchor clamps.

Description

A special clamp for gearbox crank

technical field

The utility model relates to a clamp, in particular to a special clamp for clamping a transmission crank.

Background technique

On the machine tool, the process equipment used to clamp the workpiece is called the machine tool fixture. Fixtures are an indispensable part of mechanical processing. Driven by the development of machine tool technology in the direction of high speed, high efficiency, precision, compound, intelligence and environmental protection, fixture technology is developing in the direction of high precision, high efficiency, modularity, combination, general purpose and economy. Machine tool fixtures are composed of positioning elements, clamping devices, tool setting and guiding elements, connecting elements, clamp bodies, and other devices or elements. Positioning elements, clamping devices and clamp bodies are the basic components of clamps.

According to the scope of application of the fixture, there are general fixtures, special fixtures, group fixtures, combined fixtures, etc.; according to the power source on the fixture, there are manual fixtures, pneumatic fixtures, hydraulic fixtures, electric fixtures, magnetic fixtures, vacuum fixtures, cutting force and Centrifugal force fixture, etc. The gearbox crank is to be processed with face milling. In order to enhance the rigidity of the parts during processing, the uncertainty of the axis direction of the hole must be limited. Therefore, the fixture should be designed according to the complete positioning, and strive to abide by the principle of datum coincidence, so as to reduce the impact of positioning errors on the processing accuracy. Influence.

Utility model content

In order to solve the above problems, the utility model provides a special clamp, which uses the rear plane of the crank as the positioning surface and the big and small head holes as the positioning holes, which can realize good positioning of the clamp.

The purpose of this utility model can be realized through the following technical solutions:

A special clamp for gearbox cranks, including a clamp body, on which two opposite "Z"-shaped pressure blocks are installed; on the clamp body, there are parts holes and side positioning Positioning pin holes and rhombic pin holes corresponding to the positions of the plate holes, the clamp body is also provided with pads, and a tool setting block is fixed on the pads.

The upper parts of the two "Z" shaped pressure blocks are located above the crank parts, and the lower parts are fixed on the clamp body.

The positioning pin hole and the diamond pin hole are respectively provided with a positioning pin and a diamond pin.

The spacer is arranged relative to the small head hole of the crank part.

The two "Z" shaped pressure blocks are fixed on the clamp body by bolts, and nuts are arranged on the bolts.

The tool setting block is fixed on the cushion block by screws and set screws.

Beneficial effects of the utility model: the utility model uses "Z" type briquetting block, positioning pin and diamond pin to locate the back plane and the big and small head holes of the crank part, which can limit the six degrees of freedom of the workpiece and achieve complete positioning; the "one side The "two-pin" positioning design not only increases the stability of the workpiece, but also takes into account the principle of datum coincidence to achieve good positioning of the fixture.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

Fig. 1 is the assembly top view of the utility model overall fixture;

Fig. 2 is a schematic diagram of a front partial sectional view of the utility model;

Fig. 3 is a schematic sectional view of A-A in Fig. 1;

Figure 4 is a diagram of gearbox crank parts.

Detailed ways

The clamped part of the utility model is a gearbox crank. The gearbox crank belongs to a typical crank part, and is a crank. Its main elements include two sides, large and small head holes, as shown in Figure 4. Since the rigidity of the two ribs of the crank part 1 is poor when the small head hole is drilled, from the point of view of ensuring the stability of the workpiece positioning, "one side with two pins" is used for positioning, that is, the processed rear plane and two end face holes are used as the positioning reference , which not only increases the stability of the crank part 1, but also takes into account the principle of datum coincidence.

As shown in Figure 1 and Figure 3, the special clamp for the transmission crank includes a clamp body 3, on which two "Z"-shaped pressure blocks 2 are installed, and the rear plane of the crank part 1 is located on the two "Z"-shaped Between the briquetting blocks 2, the upper parts of the two "Z"-shaped briquetting blocks 2 are pressed on the rear plane of the crank part 1, and the lower parts of the two "Z"-shaped briquetting blocks 2 have a waist-shaped hole, which passes through the clamp from bottom to top. Concrete 3 is connected with two groups of bolts 4 of waist-shaped holes, and is screwed and fixed by the nut 7 that fits in the upper end of bolt 4 .

As shown in Figure 2, the part hole and the side positioning plate hole of the crank part 1 are respectively built with a positioning pin 5 and a diamond pin 6, and the above-mentioned crank part 1 is positioned on the clamp body 3 through the positioning pin 5 and the diamond pin 6 to achieve the limit The purpose of degrees of freedom.

As shown in FIG. 1 , a spacer 9 is also installed on the chuck body 3 , and the spacer 9 is arranged relative to the small head hole of the crank part 1 , and the knife setting block 8 is fixed on the spacer 9 by screws 10 and set screws 11 .

The working process is: first install the "Z" type pressure block 2 on the clamp body 1, then install the tool setting block 8 and the spacer 9, then install the positioning pin 5 and the diamond pin 6 on the clamp body 1, and adjust the crank Positioning installation can limit the six degrees of freedom of the workpiece. Finally, the "Z" type pressure block 2 is locked on the back plane of the crank part 1 with the nut 7 on the upper end of the bolt 4, so as to achieve complete positioning, and the crank can be completed after completion. Face milling, large and small head hole processing.

The above content is only an example and description of the structure of the utility model. Those skilled in the art make various modifications or supplements to the described specific embodiments or replace them in similar ways, as long as they do not deviate from the utility model. Structures or beyond the scope defined in the claims shall belong to the protection scope of the present utility model.

Claims (6)

1. A special clamp for gearbox crank, characterized in that it comprises a clamp body (3), and two relative "Z" type pressure blocks (2) are installed on the described clamp body (3); the described clamp Concrete (3) is provided with positioning pin holes and rhombus pin holes corresponding to the part holes on the crank parts (1) and the positions of the side positioning plate holes respectively, and the clamp body (3) is also provided with spacers ( 9), the tool setting block (8) is fixed on the pad (9). 2. A special clamp for gearbox crank according to claim 1, characterized in that, the upper parts of the two "Z" shaped pressure blocks (2) are located above the crank parts (1), and the lower parts are fixed on the clamp Specifically (3). 3. A special clamp for gearbox crank according to claim 1, characterized in that, the positioning pin hole and the diamond pin hole are respectively provided with a positioning pin (5) and a diamond pin (6). 4. A special clamp for gearbox crank according to claim 1, characterized in that, the spacer (9) is arranged relative to the small head hole of the crank part (1). 5. A special clamp for gearbox crank according to claim 1, characterized in that, the two "Z" shaped pressure blocks (2) are fixed on the clamp body (3) by bolts (4), and the bolts (4) is provided with nut (7). 6. A special clamp for gearbox crank according to claim 1, characterized in that, said tool setting block (8) is fixed on the spacer (9) by screws (10) and set screws (11) .