Summary of the design points of the tooling fixture

The design of the tooling fixture is generally carried out in accordance with the specific requirements of a certain process after the mechanical processing process of parts is formulated. To formulate the process, the possibility of the fixture should be fully considered, and when designing the tooling fixture, if necessary, you can also make amendments to the process process. The quality of the design of the tooling fixture should be measured to measure the processing quality, high production efficiency, low cost, convenient crumbs, safe operation, effort, and easy maintenance as a measurement indicator.

(1) Basic principles of design fixture design

1. Meet the stability and reliability of the workpiece positioning during use;

2. There are sufficient carrying or clamping intensity to ensure the processing process of the workpiece on the installation fixture;

3. Simple and fast operation in the process of filling the clamping process;

4. Easy parts must be a structure that can be replaced quickly. When the conditions are sufficient, it is best not to use other tools;

5. Meet the reliability of repeated positioning during the adjustment or replacement process;

6. Avoid complicated structure and expensive cost as much as possible;

7. Use the standard parts as a component as much as possible;

8. Form the systematic and standardization of the company's internal products.

(2)The basic knowledge of the design of the tooling fixture

An excellent machine tool fixture must meet the following basic requirements:

1. The key to ensuring the processing accuracy of the workpiece to ensure the processing accuracy of the processing. The influence to ensure that the fixture can meet the processing accuracy requirements of the workpiece.

2. Improve the complexity of the special fixture of production efficiency should be compatible with production capacity. Try to use a variety of fast and efficient fixture mechanisms to ensure convenient operation, shorten the auxiliary time, and improve production efficiency.

3. The structure of the special fixture should be simple and reasonable to make it easy to manufacture, assemble, adjust, inspect, repair, etc.

4. The useful performance fixture should have sufficient strength and stiffness. The operation should be simple, effort, and safe and reliable. Under the premise that objective conditions are allowed and economical, mechanized clamping devices such as pneumatic and hydraulic pressure should be used as much as possible to reduce the workers' labor intensity. The tooling fixture should also be easy to discharge. If necessary, you can set the crumb structure to prevent crumbs from destroying the positioning and damage to the tools of the workpiece, and preventing the accumulation of crumbs from bringing a lot of heat to cause the process system to deform.

5.Economic special fixtures should be used as standard elements and standard structures as much as possible to strive to be simple and easy to manufacture to reduce the manufacturing cost of the fixture. Therefore, the necessary technical and economic analysis should be performed according to the order and production capacity to improve the economic benefits of the fixture in production. 

(3) Overview of the design of work fixtures

1. Basic methods and steps of design fixture design

The original information of the preparation of the preparation of the preparation of the preparation fixture includes the following content:

a) Design notice, parts of parts of parts, rough drawing and process routes and other technical materials to understand the processing technical requirements of each process, positioning and clamping schemes, processing content of the pre -process, rough situation, machine tools, knives used during processing, machine tools, tools used in processing , Inspection of the amount of inspection, the amount of processing and the amount of cutting, etc.;

b) Understand the production batch and the needs of the fixture;

c) Understand the main technical parameters, performance, specifications, accuracy of the machine tool, and the connection size of the structure connected to the fixture;

d) The standard material inventory of the fixture.

2. The design of the design of the tooling fixture

The general structure of the fixture is a single structure, which gives people the sensory structure. In particular, the popularity of the hydraulic fixture now makes its original mechanical structure greatly simplify, but if you do not consider in detail in the design process, unnecessary trouble will inevitably occur:

a) Rough amount of processed parts. Causes that the size of the blank is too large and interfere. So be sure to prepare the rough drawing before designing. Leave enough space.

b) The fineness of the fixture is smooth. Due to the limitedness of the processing space of the machine tool, the fixture is often tightly designed. At this time, the iron dumbs generated by the processing process are often stored at the dead corner of the fixture, including the outflow of the crumbs. Machining brings a lot of trouble. Therefore, the problems occurred during the processing process at the beginning of the actual situation. After all, the fixture is based on improving efficiency and easy to operate.

c) The overall openness of the fixture. Ignoring openness, resulting in difficulty in installing cards, time -consuming and labor -intensive, and taboos.

d) Basic theoretical principles of fixture design. Each set of fixtures must go through countless clamps and release the movement, so it may meet the user requirements at the beginning, but it should have its accuracy and maintain it, so do not design something that is contrary to principles. Even if you are lucky, there will be no long -term sustainability. A good design should be refined by the time.

e) The replaceability of the positioning element. The positioning elements are seriously worn, so it should be considered to replace fast and convenient. It is best not to design larger parts.

The accumulation of fixture design experience is very important. Sometimes design is one thing, and it is another thing in practical applications. Therefore, good design is a process of continuous accumulation and summary.

Commonly used work fixtures are mainly divided into the following types according to functionality:

01 Model

02 Drilling, milling surface dressing

03 CNC, instrument clip

04 Testing Qi and Water Testing

05 Cut edge, punching workflow

06 welding equipment

07 polishing

08 assembly workers

09 Transfer, laser -engraved work clothes

01 Model

Definition: Use the product shape to locate the tools for installing the clip

Design Points:

1. This type of module is mainly used for tiger clamps, and its length can be intercepted as needed;

2. Other auxiliary positioning devices can be designed on the molding mold. Generally, welding method is used to connect the sandwiches;

3. The figure above is a simple graph, and the size of the mold cavity is determined by the specific situation;

4. The proper position on the motion mold is tightly matched the positioning of the diameter 12, and the positioning hole sliding and the positioning of the positioning of the corresponding position of the fixed mold;

5. The assembly cavity needs to be shifted by 0.1mm on the basis of the shape of a contracted rough picture file.

02 Drilling, milling surface dressing