文献翻译—机床夹具设计分析

Lathe fixture design and analysis

(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

Φand the end cylinder B, design process, first select the cylindrical workpiece 5.56h

Φsemi-circular surface finishing (finishing second circular surface when the the 22.5

car has been good with 0.023023+Φ 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) 0.023023+Φ tool by the workpiece machining position relative to the guarantee. (2)

symmetry of 180.02± size 0.02. Rely on sets of holes and positioning the

workpiece with the precision of 5.56h Φ and

0.0100.00220.5++Φ 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 0.005mm .because the A side is the fixture with the lathe when the transition assembly base plate installed.

(4) specific folder on the 207H Φ-hole plate with the transition to the benchmarks 20Φ 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 0.0102.5+Φ and

0.0110.00510++Φ, drilling, boring, reaming process scheme. Boring is required in the face A face of finishing B (12Φ range) and the A, B sides and the hole 10Φ axis face runout does not exceed 0.02mm . In addition, the processing of 2.5Φ-hole, you should also ensure that its axis with the

axis of the

0.0110.00510++Φ degree of tolerance for the uranium 0.01mm Φ; 10Φ size 15.50.1± and the location of 80.1mm ±; 2.5Φ and 10Φ and 17.5Φ of the axis of the axis of displacement tolerance not more than 0.02mm .

Based on the above analysis on the part of process size, choose the 17.5Φ-hole on the workpiece surface and M, N two planes to locate the benchmark.

Installed on the lathe pallet fixture

Limited equipment in the factory, similar to the shape of the parts box, its small size,