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          Fixture classification in CNC machining

          source: time:2019-10-23 09:07:27

          01 clamping mode

          Definition: tools for positioning and clamping with product shape

          Key design points:

          1. This kind of clamping die is mainly used on vice, and its length can be cut as required;

          2. Other auxiliary positioning devices can be designed on the clamping die, which is generally connected by welding;

          3. The figure above is a diagram, and the die cavity structure size is determined by the specific situation;

          4. Fit the locating pin with diameter 12 tightly at the proper position on the moving die, and slide the locating hole at the corresponding position of the fixed die to fit the locating pin;

          5. During the design of the assembly cavity, it is necessary to offset and enlarge 0.1mm on the basis of the shape of the blank drawing file without shrinkage.

          02 drilling and milling tooling

          Key design points:

          1. If necessary, some auxiliary positioning devices can be designed on the fixed core and its fixed plate;

          2. The figure above is the structure diagram, which needs to be designed according to the product structure;

          3. The cylinder is determined according to the size of the product and the stress during processing. Sda50x50 is commonly used;

          03 numerical control and instrument collet

          A CNC chuck

          Inner chuck

          Key design points:

          1. The unmarked size in the figure above is determined according to the inner hole size structure of the actual product;

          2. The outer circle in contact with the positioning of the inner hole of the product shall be left with a margin of 0.5mm on one side during manufacturing, and finally installed on the CNC machine tool to finish turning to the size, so as to prevent the deformation and eccentricity caused by the quenching (Cu ì Hu ǒ) process;

          3. It is recommended to use spring steel for the assembly part and 45 × for the pull rod part;

          4. The thread M20 of the pull rod part is a common thread, which can be adjusted according to the actual situation

          Instrument inner harness collet

          Key design points:

          1. The figure above is a reference diagram, and the assembly size and structure are determined according to the actual product's overall dimension structure;

          2. The material shall be treated with 45 × 4, quenching (Cu × Hu × 4).

          04 gas testing tooling

          Key design points:

          1. The figure above is the reference drawing of gas testing tooling. The specific structure shall be designed according to the actual structure of the product. The idea is to seal the product in as simple a way as possible, and make the part to be tested and sealed filled with gas to confirm its tightness;

          2. The size of the cylinder can be adjusted according to the actual size of the product. At the same time, it is necessary to consider whether the stroke of the cylinder can meet the convenience of taking and placing the product;

          3. The sealing surface in contact with the product is generally made of the materials with good compression capacity, such as the rubber ring with NBR. At the same time, it should be noted that the positioning block in contact with the appearance of the product should be made of the plastic (structure: synthetic resin, plasticizer, stabilizer, color material) block of white glue, and the cotton cloth should be covered during the use to prevent the appearance of the product from being damaged;

          4. The positioning direction of the product should be considered in the design to prevent the occurrence of false inspection when the internal leakage gas is held in the mold cavity.

          05 punching tooling

          Key design points: the figure above shows the common structure of punching tooling. CNC machining CNC, also known as computer gong, CNC ch or CNC machine tool, is actually a method in Hong Kong. It can reduce the number of tooling in a large amount. CNC machining does not need complex tooling to process parts with complex shapes. CNC machining is a new machining technology. The main work is to prepare machining programs, that is, to change the original manual activities into computer programming. If you want to change the shape and size of parts, you only need to modify them The part processing procedure is applicable to the development and modification of new products. NC machining is a process method of machining parts on NC machine tools. The process procedures of NC machine tools and traditional machine tools are generally consistent, but there are also obvious changes. The machining method of controlling the displacement of parts and tools with digital information. It is an effective way to solve the problems of variable parts, small batch, complex shape, high precision and to realize high efficiency and automatic machining. The function of the bottom plate is convenient to fix on the working table of the press; the function of the positioning block is to fix the product, the specific structure is designed according to the actual situation of the product, the center point around (circle fuse) can facilitate the safe take and place of the product; the baffle is used to facilitate the product to separate from the punching knife; the pillar is used to fix the baffle. The assembly position and size of the above parts can be designed according to the actual situation of the product.

          06 welding tooling

          The welding tooling is mainly used to fix the position of each component in the welding assembly and control the relative size of each component in the welding assembly. Its structure is mainly positioning block, which needs to be designed according to the actual structure of the product. It should be noted that sealing space shall not be generated between the tools when the product is placed on the welding tooling, so as to prevent the excessive pressure of sealing space in the process of welding heating from affecting the size of parts after welding.

          The process of smoothing an object (such as a piece of gold) by rubbing

          The specific size of tire shall be designed according to the product.

          08 assembly tooling

          Assembly tooling is mainly used in the assembly process of the assembly of auxiliary positioning device. In NC machining, the control system sends out instructions to make the cutter move in a variety of required movements, and to represent the shape and size of the workpiece in the form of numbers and letters and other technical requirements and machining process requirements. It generally refers to the process of machining parts on CNC machine tools. In order to improve the degree of production automation, shorten the programming time and reduce the cost of NC machining, a series of advanced NC machining technologies have been developed and used in the aerospace industry. The design idea is that the product can be conveniently taken and placed according to the structure of component assembly, the appearance surface of the product can not be damaged during the assembly process, and the cotton cloth can be covered to protect the product during the use process. Try to use non-metallic materials such as white glue on the selection of materials.

          09 pad printing, laser lettering tooling

          Key points of design: design the positioning of tooling according to the lettering requirements of the actual situation of the product