机械毕业设计英文外文翻译71车床夹具设计分析

附录A

Lathe fixture design and analysis

Ma Feiyue

(School of Mechanical Engineering, Hefei, Anhui Hefei 230022,

China)

Abstract: From the start the main types of lathe fixture, fixture on the flower disc and angle iron clamp lathe was introduced, and on the basis of analysis of a lathe fixture design points.

Keywords: lathe fixture; design; points

Lathe for machining parts on the rotating surface, such as the outer cylinder, inner cylinder and so on. Parts in the processing, the fixture can be installed in the lathe with rotary machine with main primary uranium movement. However, in order to expand the use of lathe, the work piece can also be installed in the lathe of the pallet, tool mounted on the spindle.

THE MAIN TYPES OF LATHE FIXTURE

Installed on the lathe spindle on the lathe fixture

Installed in the fixture on the lathe spindle in addition to three-jaw chuck, four jaw chuck, faceplate, front and rear dial with heart-shaped thimble and a combination of general-purpose lathe fixture folder outside (as these fixtures have been standardized and machine tool accessories, can be purchased when needed do not have to re-design), usually need to design special lathe fixture. Common special lathe folder with the following types.

Fixture took disc lathe

This process is to find the generic is installed on the faceplate is difficult to ensure the accuracy of the workpiece, so the need to design special lathe fixture. The lathe fixture design process, first select the cylindrical workpiece

and the end cylinder B, the semi-circular surface finishing (finishing second circular

surface when the car has been good with circular surface) is

positioned datum, limit of six degrees of freedom, in line with the principle of base overlap.The work piece fixture to ensure the accuracy of measures:

The workpiece fixture to ensure the accuracy of measures:

(1) tool by the workpiece machining position relative to the guarantee. (2) symmetry of size 0.02. Rely on sets of holes

5.56h Φ22.5Φ0.023023+Φ0.023023+Φ180.02±

and positioning the

workpiece with the precision of and

locate the position of dimensional accuracy and process specification requirements to ensure that the same parts of the four circular surface must be processed on the same pins.

(3) all fixtures and clip bushing hole axis vertical concrete face A tolerance of .because the A side is the fixture with the lathe when the transition assembly base plate installed.

(4) specific folder on the

-hole plate with the transition to the benchmarks pin design requires processing each batch of parts to be sold in the transitional disk with a coat made of a tight match, and the local processing of the face plate to reduce the transition fixture on the set of small errors.

The angle iron fixture

If the processing technology for the and

, drilling, boring, reaming process scheme. Boring is required in the face A face of finishing B ( range) and the A, B sides and the hole

axis face runout does not exceed . In addition, the processing of -hole, you should also ensure that its axis with the axis of the

degree of tolerance for the uranium ; size 5.56h Φ0.0100.00220.5++Φ0.005mm 207H Φ20Φ0.0102.5+Φ0.0110.00510++Φ12Φ10Φ0.02mm 2.5Φ0.0110.00510+

+Φ0.01mm Φ10Φ