There are many ways to clamp the workpiece on the milling machines. Let's start by saying how to use the flat nose clamps and the press plate to hold the workpiece.
1. The workpiece is clamped on the machine vice
(1) The clamping of blank pieces. Select a large plane on the blank as a rough datum, which rests against a fixed jaw or guide surface. In the jaw or guide surface and the workpiece between the rough surface of copper pad, to prevent damage to the jaws. First light grip the workpiece, with a dial to correct the rough plane position, the basic parallel and then clamping the workpiece.
(2) The clamping of the workpiece after the roughing. Select a larger rough surface on the workpiece as a reference plane, it will be fixed to the fixed jaw or clamp body surface for clamping. When the workpiece base is facing the fixed jaw face, a round bar can be placed between the movable jaw and the workpiece in the middle of the height of the jaws holding the part of the workpiece. Through the round bar clamping the workpiece, to ensure that the workpiece reference plane and fixed jaw face a good fit.
When the reference surface of the workpiece is against the rail surface of the clamp body, a parallel horn is provided between the workpiece and the milling machine guide rail. In order to make the workpiece reference plane parallel to the guide surface, after clamping with a copper hammer blow the upper surface of the workpiece, and hand to try to horn, to loose is appropriate. This shows that the workpiece is well fitted with the horn and then clamped. When the workpiece is clamped with a machine vice, the placement of the workpiece should be appropriate. The clamping force of the workpiece should be evenly equal. After cutting the allowance, the working surface should be 5 ~ 10mm higher than the plane of the jaws.
2.Clamp the workpiece with the press plate
Shape, large size or not easy to use flat nose clamps clip of the workpiece, commonly used press plate in the milling machine table for processing. The workpiece is clamped with the press plate, and the method of milling with face milling cutter in horizontal universal milling machines is widely used.
There are many kinds of press plate shape, can adapt to a variety of different shapes of workpiece clamping needs. In the mill machine with a press plate clamping workpieces, mainly press plate, horn, T-bolts (T-nuts) and nuts. When clamping the workpiece with a press plate, two or more platens should be selected. One end of the platen shall be on the workpiece and the other end on the horn. The height of the horn shall be equal to or slightly higher than the height of the workpiece to be pressed.
And the distance between the workpiece should be as short as possible.
When using the press plate, there should be a gasket between the nut and the platen.