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What errors may occur during CNC machining and CNC machining​?

 CNC machining and numerical control machining are a method to control the movement of machine tools and the production process of machining through computer digitization and information digitization. It is an intelligent numerical control device developed as an economical, high-speed, reliable, multi-functional, intelligent, and open structure. CNC machining is also an important indicator that can measure the continuous level and comprehensive ability of a safety technology, as well as the degree of modernization of related science and technology capabilities, especially in aviation, biology, medical and other high-tech cultural industries, and it is also a powerful indicator. reflect. So, what errors may occur during CNC machining and CNC machining? Let us understand together:   The use of approximate machining motion or approximate tool contours causes errors in the CNC principle of machining. The reason why it is called machining principle error is because of the error in machining

TI TPS65266RHBR

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What are the rules for metal stamping die scrap tube?

The Purpose Standardize the management of the scrapping of the company's metal stamping dies, prevent the loss of company assets, and formulate this system specially. Scope of application It is suitable for the management of the company's scrap molds. Definition If the molds listed in the assets of the company fall under one of the following circumstances, the use management department may apply for scrapping. 1. Molds that exceed the specified service life. 2. The mold is severely damaged by accidents or accidents, and molds that cannot be repaired or have no repair value. 3. Metal stamping dies that have not reached the service life, but due to safety, quality, efficiency and other issues, the repair still fails to meet the minimum requirements of the customer's product process or affects the production safety and efficiency. 4. Product customers have stopped placing orders or have not placed orders for molds in several years. 4. Responsibilities 1. Responsibilities of th

Cylindrical Grinding CNC Machining Process of Aerospace Parts

Cylindrical grinders are divided into ordinary cylindrical grinders and universal cylindrical grinders. The outer cylindrical surface and outer conical surface of the workpiece can be ground on the ordinary cylindrical grinder, and the inner cylindrical surface and inner cone can also be ground on the universal cylindrical grinder. For surface and end faces, cylindrical grinders are divided into ordinary cylindrical grinders and universal cylindrical grinders. The outer cylindrical surface and outer conical surface of the workpiece can be ground on ordinary cylindrical grinders, and the inner cylinder can also be ground on universal cylindrical grinders. Face and inner cone face and end face. The main parameter of the cylindrical grinder is the maximum grinding diameter. Below is a brief analysis, examples of aerospace parts, and the Cnc Machining process of cylindrical grinding!

Work Ideas:Cylindrical grinder is a grinder (also called top center grinder or cylindrical grinder) that uses a grinding wheel as a tool to grind cylindrical steel parts into precise concentricity.

Structure:The main machine is composed of bed, head, tail, grinding head, transmission dust collector and other components. The head, the grinding head can be rotated, the special fixture used for grinding the thimble and the chamfering of the top roller, the dynamic balance frame, and the top roller detector are ordered by the customer.

Features:

  • The bearing of the grinding wheel spindle adopts the tapered shaped oil wedge dynamic pressure bearing, and the grinding wheel spindle still has high bearing rigidity at low speed.
  • The guide rail of the grinding wheel frame adopts the cross-roller rigid guide, and the semi-automatic feeding mechanism adopts the rotary cylinder.
  • The tailstock shaft system has the characteristics of no gap rigidity, and the electrical box, hydraulic box and cooling box are separated from the machine tool.
  • Rich grinding indicator and coolant filter.
  • The speed of the headstock has that AC frequency conversion stepless speed regulation.
  • Programmable controller (pc) is adopted for electrical, which has self-diagnosis function and is very convenient for maintenance.
  • Optional automatic measuring instrument.

Cylindrical grinding and other grinding forms and characteristics of aerospace parts grinders:

Grinding form

There are many types of grinding, and there are many different forms according to different methods.

According to the shape of the surface to be ground, it can be divided into cylindrical grinding, internal grinding, surface grinding, thread grinding, gear grinding, guideway grinding, deep hole grinding, etc.

grinding characteristics

  • Grinding can reach high precision and low surface roughness, usually IT6 ~ IT7 level dimensional accuracy, and the processed surface roughness obtained is Ra1.25 ~ 0.08um; while the super precision grinding and mirror grinding surface The roughness can reach Ra0.05um.
  • It can grind various hardened steels, hot alloy steels and hard alloys and other difficult-to-process materials.
  • Grinding facilitates forming processing. Since the grinding wheel can be trimmed into a variety of different profiles according to the processing requirements, it is possible to grind and shape the complex shape at one time. It is widely used in precision forming and grinding to reduce the intermediate links of processing.
  • The grinding allowance is small, which is suitable for the subsequent processing of precision casting, die forging and precision stamping parts to further improve the precision of precision blanks and reduce surface roughness.
  • Grinding is suitable for automatic equipment, which can optimize the grinding process.

use

Cylindrical grinder is mainly used for precision grinding of the end face, outer circle and conical surface of batches of shaft parts. It is the main equipment in automobile engine and other industries. It is also suitable for the processing of shaft parts with small batches and high precision requirements in military, aerospace, and general precision machining workshops. ⑴Used in textile spinning industry, coarse and fine yarn frame, draw frame, combing machine, texturing machine and other top roller processing. ⑵Used in the manufacture of office communication equipment industry, fax machines, copiers, printers, cutting plotters and other rubber roller processing. ⑶It is suitable for top rollers and plastic processing of automatic conveying devices in printing, food and pharmaceutical industries.

The Influence of Cylindrical Grinding Machine’s Machining Accuracy of Aerospace Parts

  1. The influence of the height of the grinding head, headstock, and tailstock on the dimensional accuracy of the workpiece. The height error of the grinding head, headstock, and tailstock will cause the center line of the headstock and tailstock and the axis of the grinding wheel to shift in space. At this time, the surface of the workpiece will be a hyperboloid.
  2. The influence of the parallelism error of the axis of the grinding head spindle in the horizontal plane by the connection between the center of the headstock and the tailstock on the dimensional accuracy of the workpiece. When this error occurs, the shape of the workpiece ground by the cylindrical grinder will be a cone, that is, the grinding wheel will be ground at an angle and the surface will have spiral grinding patterns.
  3. The impact of the verticality error of the grinding head movement relative to the machine tool rail on the machining accuracy. The final result of this error is that the axis of the main shaft is offset from the center of the headstock and tailstock. When grinding the end face of the shaft shoulder, it will cause an error in the perpendicularity between the end face of the shaft shoulder and the axis of the workpiece. When grinding the outer circle, it will affect the surface roughness and produce spiral grinding lines.

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