Fixture is also a machine tool fixture, it is a device on the machine tool, used to clamp the workpiece, so that the workpiece can be accurately positioned. It plays a vital role in the work of machine tools, different machine tools used in the fixture is not the same, there are lathe fixture, drilling machine fixture, grinding machine fixture, gear fixture, etc.; as well as manual fixture, pneumatic fixture, magnetic fixture and so on. No matter what kind of fixture, it plays a great role in the machine tool where it is located. The following small series for everyone to explain the role of machine tool fixture and its composition principle.

The role of the fixture

1) can stably ensure the machining accuracy of the workpiece

When the workpiece is clamped with a fixture, the position accuracy of the workpiece relative to the tool and the machine tool is guaranteed by the fixture, which is not affected by the technical level of the workers, so that the machining accuracy of a batch of workpieces tends to be consistent.

2) can reduce the auxiliary working hours, improve labor productivity

Clamping the workpiece with a fixture can quickly locate and clamp the workpiece without finding the right, which significantly reduces the auxiliary working hours. Clamping the workpiece with a fixture improves the rigidity of the workpiece, so the cutting amount can be increased. Multiple and multi-station fixtures can be used to clamp the workpiece, and efficient clamping mechanism can be used. These factors are conducive to improving labor productivity. In addition, after the use of fixtures, the product quality is stable, the rejection rate is reduced, and workers with lower technical levels can be arranged, which significantly reduces production costs.

3) can expand the use of machine tools, to achieve a multi-functional machine

The use of special fixtures can change the use of the original machine tool and expand the scope of use of machine tools, to achieve a multi-purpose. For example, after the boring die fixture is installed on the lathe or rocker drilling machine, the box hole system can be bored. Through the special fixture, the lathe can also be changed to broaching machine to give full play to the role of general-purpose machine tools.

4) Reduce the labor intensity of workers

It is convenient and fast to clamp the workpiece with a fixture. When pneumatic and hydraulic clamping devices are used, the labor intensity of workers can be reduced.

Composition principle

(1) Positioning element

It is in contact with the positioning reference of the workpiece and is used to determine the correct position of the workpiece in the fixture, so as to ensure the relative correct position between the workpiece and the tool and the machine tool during processing. Locating pin 6 in Fig. 6-1.

(2) Clamping device

It is used to clamp the workpiece and keep the workpiece in the fixed position in the fixture during cutting. Nut 5 and split washer 4 as in Fig. 6-1. nextpage

(3) Knife, guide element or device

The role of these elements is to ensure the correct position between the workpiece and the tool. The element used to determine the correct position of the tool before machining is called the tool-setting element, such as the tool-setting block. The element used to determine the tool position and guide the tool for machining is called the guide element. Quick-change drill sleeve as shown in Fig. 6-1

(4) Connecting elements

The components that connect the fixture with the machine tool ensure the mutual position relationship between the machine tool and the fixture.

(5) Fixture body

It is used to connect or fix the components and devices on the fixture to make it an integral basic part. It is connected with the relevant parts of the machine tool, the fixed, so that the fixture relative to the machine tool has a certain position. Figure 6-1 in the clamp body 7.

(6) Other components and devices

Some fixtures according to the processing requirements of the workpiece, to have indexing mechanism, milling machine fixture also has a positioning key.

The above content is the main function of the fixture and the composition principle of the detailed introduction, the relevant staff to look at it! Fixture appeared at a very early time, when it was just an auxiliary tool, now with the development of science and technology, it has become a complete category, has an important role in the process of equipment. It can adapt to a variety of modern new machine tools, and can quickly equip the production of new products, shorten production time, improve production efficiency, reduce labor intensity, and ultimately reduce the total cost of production.