The

When the wire cutting machine clamps the workpiece, it must ensure that the cutting part of the workpiece lies within the cutting range of the X-axis and Y-axis feed of the machine table. At the same time, the electrode wire movement space should be considered when cutting. Fixtures should be as versatile (or standard) as possible. The selected fixtures should be easy to set up and coordinate the dimensional relationship between the workpiece and the machine. When processing large-scale molds, special attention must be paid to the positioning of the workpieces. Especially at the end of processing, deformation of the workpieces and the effect of gravity will cause the electrode wires to be clamped and affect processing. 1) Cantilever clamping

The

The cantilever method is used to clamp the workpiece, which is easy to install and versatile. However, due to the overhang of one end of the workpiece, the perpendicularity error between the cutting surface and the upper and lower planes of the workpiece is likely to occur. It is only used when machining is not required or the cantilever is short.

The

2) Both ends of the support method

The

The workpiece is clamped at both ends. The clamping is convenient and stable, and the positioning accuracy is high. However, it is not suitable for clamping large parts.

The

3) Bridge support method

The

In this way, the horn is placed on the universal fixture and then the workpiece is clamped. The clamping is convenient. It can be used for large, medium and small workpieces.

The

4) Plate support method

The

According to the commonly used workpiece shape and size, a support plate with a through hole is used to clamp the workpiece. This method has high clamping accuracy but poor generality.

The

(2) Adjustment of the workpiece

The

In the above method, the workpiece must be clamped, and adjustments must be made in conjunction with the method of alignment so that the positioning reference plane of the workpiece can be kept parallel to the feed direction x and y of the table and the table of the machine, respectively, to ensure that the surface and the reference are cut. The relative position accuracy between faces. The commonly used methods of correction are:

The

1) Use dial indicator to find out

The

Hold the dial indicator on the wire frame or other position with a magnetic watch stand. The measuring head of the dial indicator is in contact with the base surface of the workpiece. Move the table back and forth and adjust the position of the workpiece according to the indication value of the dial indicator until the indicator of the dial indicator. The yaw range reaches the required value. The search should be made in three directions perpendicular to each other.

The

2) Marking Method

The

When the accuracy of the positional accuracy between the cutting pattern and the positioning reference of the workpiece is not high, the ruled line method can be used to correct the position. Using a reference line drawn on the wire frame to align the workpiece, the table is moved back and forth, and the deviation between the stylus and the reference is visually observed, and the workpiece is adjusted to the correct position.