Category Archive Machinery industry

A mechanical part is composed of several surfaces. To study the relative relationship of parts’ surfaces, a datum must be determined. The datum is the point, line and plane on which the position of other points, lines and surfaces can be determined. According to the different functions of benchmarks, benchmarks can be divided into design basis and process basis. Today, I will take you to know what range of machining is applicable to?

1. All kinds of metal parts processing;
2. Sheet metal, box and metal structure;
3. Mechanical processing of titanium alloy, high temperature alloy, non-metal, etc;
4. Wind tunnel combustor design and manufacture;
5. Non standard equipment design and manufacture.
6. Mold design and manufacturing.

A mechanical part is composed of several surfaces. To study the relative relationship of parts’ surfaces, a datum must be determined. The datum is the point, line and plane on which the position of other points, lines and surfaces can be determined. According to the different functions of datum, machining datum can be divided into design datum and technological datum.

Machining design datum: the datum used to determine the position of other points, lines and planes on the part drawing, which is called design datum.

Machining process datum: the datum used in the process of machining and assembling parts, which is called process datum. According to different uses, process datum can be divided into assembly datum, measuring datum and locating datum.

(1) Assembly datum: the datum used to determine the position of parts in parts or products during assembly, which is called assembly datum.

(2) Measurement datum: the datum used to check the size and position of machined surface, which is called measuring datum.

(3) Positioning datum: the datum used for workpiece positioning during machining, which is called positioning datum. The surface (or line or point) used as the reference for positioning

In the process, only the rough blank surface can be selected. This positioning surface is called the rough datum. In the subsequent processes, the machined surface can be used as the positioning reference, and the positioning surface is called the fine basis

The machining error of Automatic Parts refers to the degree of deviation between the actual geometric parameters (geometric size, geometric shape and mutual position) and the ideal geometric parameters. The smaller the machining error is, the higher the degree of conformity is, the higher the machining accuracy is. Machining accuracy and machining error are two ways of saying a problem.

1. Automatic parts processing positioning error: positioning error mainly includes the datum misalignment error and positioning pair manufacturing inaccuracy error.
2. Measurement error of automatic parts processing: when parts are measured during or after processing, the measurement accuracy is directly affected by the measurement method, measuring tool accuracy, workpiece and subjective and objective factors.
3. Tool error: any tool in the cutting process will inevitably produce wear, and resulting in changes in the size and shape of the workpiece.
4. Fixture error: the role of the fixture is to make the workpiece equivalent to the tool and machine tool have the correct position, so the geometric error of the fixture has a great impact on the machining error (especially the position error)
5. Machine tool error: including spindle rotation error, guide error and transmission chain error. Spindle rotation error refers to the variation of the actual axis of rotation relative to the average axis of rotation at each moment of the spindle, which will directly affect the accuracy of the workpiece to be processed.

In our processing industry, the purchase of appropriate raw materials is the basis of processing. Otherwise, if we buy inferior parts to process, automatic parts processing will not produce good products. So what should we pay attention to when purchasing parts?

1. Automatic parts processing units must have ISO9000 certification to provide the required items
2. The articles provided must have the quality assurance form provided by the fingertip Department of the unit.
3. Original material quality assurance form of the supplied articles
4. The demander must inspect and verify the supplier’s management system and put it into the list of qualified suppliers of the enterprise before using the goods provided by the supplier.

(1) When the machined workpiece is too high, it should be roughened with different length of knife in layers. After using a large knife for roughening, the residual material should be removed with a small knife.

(2) The flat bottomed cutter is used to process the plane, and the ball cutter is used less so as to reduce the processing time; if there is a slope and it is an integer, it should be processed with a slope cutter.

(3) The reasonable setting of tolerance can balance the machining accuracy and the computer calculation time, do more procedures, and reduce the idle tool time.

(4) If the hardness of the blank material is high, the reverse milling is selected; if the hardness of the blank material is low, the down milling is selected. Rough machining up milling, finish machining down milling.

(5) The tool material has good toughness and low hardness, which is suitable for rough machining, while the tool material with poor toughness and high hardness is suitable for finish machining.

We also have some errors in our work. Of course, our machinery always takes a nap. But if we find errors in the process of processing, the opposite sex should be corrected in time, otherwise there will be a lot of unnecessary trouble in the later stage. Today’s editor will take you to understand it What are the causes of errors in automatic parts processing?

1. Automatic parts processing: spindle rotation error. The spindle rotation error refers to the variation of the actual rotation axis relative to its average rotation axis at each moment. The main reasons for the radial rotation error of the spindle are: the coaxiality error of several sections of the spindle journal, various errors of the bearing itself, the coaxiality error between the bearings, and the spindle deflection.
2. Guide rail error. The guide rail is the datum to determine the relative position relationship of each machine tool component on the machine tool, and it is also the datum of the machine tool movement. The uneven wear and installation quality of the guide rail are also the important factors causing the guide rail error.
3. Drive chain error. The transmission error of transmission chain refers to the relative motion error between the first and the last end of the transmission chain. The transmission error is caused by the manufacturing and assembly errors of each link in the transmission chain and the wear in the use process.
4. The geometric error of the tool. It is inevitable to change the shape and size of the workpiece in the process of cutting.
5. Positioning error. One is the misalignment error of datum. The datum used to determine the size and position of a surface on the part drawing is called design datum. The datum used to determine the size and position of the machined surface in the process drawing is called the process datum. When machining the workpiece on the machine tool, it is necessary to select some geometric elements on the workpiece as the positioning datum during machining. If the selected positioning datum does not coincide with the design datum, the datum misalignment error will occur. Second, the positioning pair manufacturing error is not accurate.

When processing, there are many factors that affect the product quality or Jigong effect. If we want to produce perfect products, we need to ensure that the machinery and materials are in the best state when processing. Today, we will learn about the impact of tool material on our products when machining in Dongguan?

Milling tools are constantly optimized to meet the needs of modern production, machine tools and data, and are widely accepted by all industries. The use of tools also helps to increase spindle speed, high speed feed and hard part milling, and extends the opportunities for dry cutting. The design of these tools is more concise, and the amount of work required for adjustment and maintenance is very small. The cutter body is rigid and accurate in size. It is made of pre hardened steel to ensure that the blade is accurately and firmly installed on the milling cutter body, and the appropriate tooth pitch can be selected according to different application.

With the rapid development of the processing industry, some of our processing industries are also in continuous development, for example, our precision hardware processing is the same, the development is still very good, so what are its advantages, why is it so popular?

1. CNC machining precision of precision hardware shaft is high, with stable processing quality;
2. It can carry out multi coordinate linkage and process complex shape parts;
3. When the CNC machining parts of precision hardware are changed, only the NC program needs to be changed, which can save the production preparation time;
4. The machine tool itself has high precision and rigidity, so it can choose favorable processing amount and high productivity (generally 3 to 5 times of ordinary machine tool);
5. High degree of automation of machine tools can reduce labor intensity;

With the rapid development of modern mechanical processing, the rapid development of mechanical processing technology, slowly showing a lot of advanced mechanical processing techniques and methods, such as micro machining technology, rapid prototyping technology, careful and super careful processing technology and so on.

Micromachining technology

Mechanical products

With the development of micro / nano science and technology, micromachining, which is characterized by small size of its own mode or extremely small exclusive criteria, has become a kind of high-tech for people to understand and change the micro world. Due to the characteristics that micromachining can operate in a small space without disturbing the working environment and objects, micromachining has a broad application potential in aerospace, meticulous instruments, biomedical and other boundaries, and has become an important means to explore nanotechnology. Therefore, it is highly valued and listed as the first key technology in the 21st century.

Rapid prototyping machining technology

Rapid prototyping technology is developed in the 20th century. It can produce sample or parts quickly according to CAD model. It is a manufacturing method of raw material accumulation, that is to complete three-dimensional forming by orderly accumulation of raw materials. Rapid prototyping technology is an important part of modern advanced machining technology, which integrates CNC technology, raw material technology, laser technology and CAD technology.

Meticulous and super meticulous machining technology

As an important part of modern mechanical processing and manufacturing technology, careful and super careful processing is one of the important indicators to measure the level of a country’s high-tech manufacturing industry. Since the 60s of the 20th century, with the development of computer and information technology, higher requirements have been put forward for manufacturing technology, which requires not only high dimensional and geometric accuracy, but also high surface quality. It is in such a market demand that the over intensive processing technology has been rapid development, all kinds of processes and new methods are constantly

1. Remove the internal stress of the blank. It is mainly used for casting, forging and welding parts.
2. Improve the processing conditions to make the raw materials easy to process. Such as annealing, normalizing, etc.
3. Improve the comprehensive mechanical function of metal raw materials. For example, quenching and tempering.
4. Increase the hardness of raw materials. For example, quenching, carburizing and quenching, etc.

Machining parts for the corresponding heat treatment process, which helps to improve the hardness, wear resistance and strength of machined parts, so that the accuracy and service life of machined parts are greatly enhanced.