A large inventory of typical fixtures such as drilling machines, milling machines, lathes, and combinations

1. Drilling machine fixture

The obvious feature of the drill press fixture is that it is equipped with a drill sleeve that guides the drill bit. The drill sleeve is installed on the drill template. The drill press fixture is customarily called the "drill mold".

(1) The main types of drilling jigs and their structural characteristics

　　According to the distribution of the processed holes on the workpiece and the production type of the workpiece, the structure of the drilling mold has a fixed type, a rotary type, a flip type, a swing type and a sliding column type.

1. Fixed drilling jig

2. Rotary drilling jig

3. Flip jig

4. Sliding Column Drilling Jig

5. Cover type drilling jig (removable drilling template type drilling jig)

(2) Key points of drilling machine fixture design

1. Drill sleeve

　　The role of the drill sleeve is to determine the axis position of the drill bit, reamer and other tools to prevent the tool from deflection during processing. According to the characteristics of use, drill sleeves can be divided into fixed, replaceable, quick-change and other structural forms.

(1) Fixed drill sleeve

(2) Replaceable drill sleeve

(3) Quick-change drill sleeve

(4) Special drill sleeve

2. Drill template

　　Common drill templates have four structural forms: fixed, hinged, detachable, and suspended.

(1) Fixed drilling template

(2) Hinge type drill template

(3) Hanging drill template

3. Determination of the size and tolerance of the drill sleeve position

　　The position of the drill sleeve on the fixture is marked based on the positioning surface of the positioning element or the axis of the positioning element. The size of the drill sleeve position is based on the average size of the corresponding size of the workpiece, the tolerance is taken as 1/2~1/5 of the corresponding size tolerance of the workpiece, and the deviation is marked symmetrically.

2. Milling machine fixture

　　Milling is an intermittent cutting, which is prone to vibration. The stressed parts of the milling machine fixture must have sufficient strength and rigidity, the clamping force provided by the clamping mechanism should be large enough, and better self-locking performance is required.

　　Tool setting block and positioning key are the unique components of the milling machine fixture. The tool setting block is used to determine the position relationship between the milling cutter and the fixture positioning element; the positioning key is used to determine the position relationship between the fixture and the machine tool. Metal processing WeChat, really good, follow it now!

1. Tool setting device

　　The position of the working surface of the tool block on the fixture is marked on the basis of the positioning surface of the positioning element or the axis of the positioning element. The position size can be calculated according to the process size and feeler gauge size, and the tolerance is generally taken as 1/5 to 1/2 of the corresponding process size tolerance, and the deviation is marked symmetrically.

2. Positioning key

　　The correct position of the milling machine fixture and the machine tool is determined by the cooperation of the two positioning keys installed in the longitudinal through groove on the bottom surface of the fixture and the T-shaped groove on the machine tool table. The commonly used positioning key is a rectangular cross-section structure. In order to reduce the positioning error, the installation distance between the two positioning keys should be as large as possible.

Three, lathe fixture

　　Lathe fixtures are generally used to process rotating parts. During turning, the lathe spindle drives the workpiece to rotate through the fixture. When designing this type of fixture, attention should be paid to solving the mass balance and operation safety problems caused by the rotation of the fixture.

Four, modular fixture

　　Modular fixture is a fixture assembled with a set of pre-manufactured standard components and parts. After finishing the specified processing tasks with the combined fixture, it can be easily disassembled. The used components and fittings are cleaned and stored in the warehouse for the next time the fixture is assembled. Modular fixture is a fixture with the highest degree of standardization, serialization and generalization in machine tool fixtures. Its basic characteristics are: flexible and changeable structure, long-term repeated use of components, and short design and assembly cycles. The disadvantages of modular fixtures are: large volume, poor rigidity, and large one-time investment in purchasing components and assemblies. Modular fixtures are suitable for processing workpieces with high position accuracy requirements in single-piece and small-batch production, and are often used in trial production of new products and completion of temporary surprise tasks. Metal processing WeChat, really good, follow it now!

Five, accompanying fixture

　　The accompanying fixture is a mobile fixture used in automatic production lines. In addition to completing the positioning and clamping of the workpiece, the accompanying fixture also carries the processed workpiece to the machine tool fixture of each machine tool by the transport mechanism according to the process flow of the automatic production line, and the machine tool fixture locates and clamps it.