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The importance of fixtures in machining and the steps to make fixtures

by:Vowin Rapid Prototyping     2023-02-02
Fixtures can stabilize parts, improve manufacturing quality, and reduce production costs. A correct understanding of the role of fixtures in processing is conducive to improving the efficiency of parts production. Why are fixtures important in CNC machining? As we know, choosing the right fixture will greatly improve the economics of the manufacturing process, allowing smooth operation, simplified production and quick process changeovers. Fixtures help compensate for the limitations of CNC machines when machining parts. They are devices designed to provide safety and maintain reliability of part position during machining. Described below are the different roles fixtures play in custom CNC machining. 1. One of the main purposes of part holding fixtures is to provide secure mounting of parts during machining. They are custom designed to fit the specific part being machined. Whenever a part may need to be held at a specific angle or clamped in a specific shape, they provide the corresponding fixation. Reliable custom fixtures are critical to preventing errors caused by chatter and tool pullout. Some examples of fixtures used for part holding are vises, chucks, milling fixtures, and various clamping plates. 2. One function of the part protection fixture is to protect the workpiece during processing. They go a long way in maintaining the desired finish and maintaining proper runout. Sleeves, bushings and skin fixtures are often designed for custom parts with controlled surface finish. This is done to protect the surface of the finished part from metal shavings from the machined workpiece. In addition, custom fixtures are specially designed to meet the requirements of special parts, which have strict requirements on overall runout. 3. Position control fixtures are very important in maintaining dimensional and positional accuracy. They hold the workpiece in the correct position and orientation during machining. For these reasons, fixtures are a convenient way to incorporate control functions into the process to minimize human error. Fixtures control position, orientation, and stability by constraining the degrees of freedom of the working part. This is accomplished through the use of pins, jaws, flats and fasteners when designing the required fixture. Flats provide support for parts, claw clips allow adjustable installation with controllability for removal, and pins provide precise positional control for specific functions. 4. Part consistency fixtures make it possible to machine multiple custom parts while maintaining their quality. They ensure that the quality is consistent from part to part. Examples of feature controls that require consistency are flatness, parallelism, perpendicularity. 5. Reduced setup fixtures are a great way to eliminate tedious inspections when loading parts. Fixtures designed for specific parts make the entire CNC process a plug-and-play operation. The operator's job will only be partially loaded, since all necessary position control and part references are already managed within the fixture. Many CNC machining manufacturers use fixtures during machining to save valuable setup time for other value-added processes. Some examples of fixtures that reduce setup time are SMED (Single Minute Die Change) fixtures, milling fixtures, soft jaws, hex milling fixtures, and many more. The basic method and steps of making the fixture. The pre-design preparation of the original information of the fixture design includes the following contents (1) Technical information such as design drawing, finished part drawing, rough drawing and process route. Understand the processing technology requirements, positioning and clamping schemes of each process, the processing content of the previous process, the rough condition, the machine tools used for processing, tools, inspection tools, machining allowances and cutting amounts, etc. (2) Understand the production batch and the demand for fixtures, and roughly determine the number of fixtures required. (3) Understand the main technical parameters, performance, specifications, precision and structural contact dimensions of the fixture connection part of the machine tool used. (4) Material inventory for jigs and fixtures. The following materials are used for jigs and fixtures: hardened steel, cast iron, plastic, carbide, epoxy, stainless steel, bronze, low-melting alloy steel. You can choose the appropriate material according to the processing project. Fixture Design Considerations Fixture design generally has a single structure, giving people the feeling that the structure is not very complicated, especially now that hydraulic fixtures are very popular, which greatly simplifies the original mechanical structure, but if you do not carefully consider the design process, it will inevitably bring inconvenience. necessary trouble. Therefore, the following points need to be considered when designing the fixture. (1) If the blank size of the workpiece is too large, it will cause interference. Therefore, the rough drawing must be prepared before designing. Leave enough space. (2) The chip removal of the fixture is smooth. Due to the limited machining space of the machine tool, the fixture is often designed as a relatively compact space. This is often overlooked, which will cause the chips generated during the machining process to be stored in the dead corner of the fixture. Another problem is that it may cause the cutting fluid to flow out smoothly, which will bring a lot of trouble to the subsequent processing. Therefore, the problems that arise during the processing should be considered at the beginning of the actual processing. After all, the fixture is to improve efficiency and facilitate operation. (3) Neglecting the overall openness of the fixture will make it difficult for the operator to install the clamp, which is time-consuming and labor-intensive. (4) Basic theoretical principles of fixture design Each set of fixtures and fixtures has to go through numerous clamping and loosening actions, so it is possible to meet all the requirements of users from the very beginning. Fixtures and fixtures must maintain accuracy, and do not design things that violate the principle. Even if you can get away with it now, it's not sustainable in the long run. A good design should stand the test of time. (5) The replaceable positioning elements of the positioning elements are heavily worn. So quick and easy replacement should be considered. It is best not to design large and complex parts. Shenzhen Vowincan provide you with customized fixture solutions, so that your parts can be processed efficiently. Contact us now to start a new project.
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