Yearly Archive September 10, 2020

Computer gong is a kind of artificial intelligence, which is controlled by computer to complete complex processing.

Computer gongs processing is also known as CNC milling machine processing, CNC milling machine is developed on the basis of general milling machine, the processing technology of the two is basically the same, the structure is also somewhat similar, CNC milling machine is in the ordinary milling machine integrated digital control system, under the control of program code more accurate milling processing machine tool.

1、 Inspection standard of computer gongs before processing

1. Divide the center and read the number. After each time, copy the number of working coordinates. After clearing, check again whether the distance from the center to both sides is consistent, so as to ensure that the center and reading are correct.
2. Tool selection, tool loading, tool setting and z-axis coordinate reading. Select the appropriate tool according to the programming list. Clean the cutter head and nozzle thoroughly before installing the tool. After installing the tool, use the calibration table to check whether the tool has deflection. It is necessary to check again after the tool is set and the number is read, so as to avoid the wrong knife, which will bring great loss to the company.
3. transmit program, start processing: use the single section execution before the knife, transfer the speed and feed speed to the slowest, slow down the knife, watch the machine tool showing the Z axis margin, check whether there is any abnormal, if abnormal, press the pause button immediately, find out the reason to solve the anomaly, confirm that everything is adjusted to the right speed to start processing.
4. In the process of processing, always pay attention to observe whether the processing is abnormal and whether the tool is worn. If the tool wear is serious, the grinding shall be suspended to ensure the normal processing.

Milling cutter is used on CNC machining center or ordinary milling machine.

Material and hardness of milling cutter.

Specifications of milling cutter, such as: length of cutting edge, total length, diameter of cutting edge, diameter of shank, etc.

If it is used on the CNC machining center, it should choose the whole cemented carbide, ordinary milling machine can choose white steel.

The hardness of white steel milling cutter is softer than that of carbide milling cutter. The high-speed steel cutter is cheap and has good toughness, but its strength is not high, so it is easy to let the cutter. Moreover, the wear resistance and thermal hardness of the high-speed steel cutter are relatively poor. The thermal hardness of the high-speed steel milling cutter is about 600 degrees, and the hardness is about 65hrc. Obviously, when milling harder materials with white steel, if the coolant is not in place, it is easy to burn the cutter, which is one of the reasons for the low thermal hardness.

Cemented carbide milling cutter has good thermal hardness, wear resistance, but poor impact resistance. The blade will be broken if it is dropped casually. Cemented carbide is made by powder metallurgy, with hardness of about 90hra and thermal property of 900-1000 degrees. Therefore, white steel is suitable for ordinary milling machine, alloy milling cutter for CNC machining center.

Selection of milling cutter diameter

The selection of milling cutter diameter depends on different products and production batches. The selection of cutter diameter mainly depends on the specification of equipment and the processing size of workpiece.

① Plane milling cutter. When selecting the diameter of the plane milling cutter, the power required by the cutter should be within the power range of the machine tool, and the diameter of the spindle of the machine tool can also be used as the basis for selection. The diameter of plane milling cutter can be selected as d = 1.5D (D is the diameter of spindle). In mass production, the tool diameter can also be selected according to 1.6 times of the cutting width of the workpiece.

② End mills. The selection of end mill diameter should mainly consider the requirements of workpiece processing size, and ensure that the power required by the cutter is within the rated power range of the machine tool. If it is a small diameter end mill, whether the highest speed of the machine tool can reach the minimum cutting speed (60m / min) should be mainly considered.

③ Groove milling cutter. The diameter and width of the groove milling cutter should be selected according to the size of the workpiece to be processed, and the cutting power should be within the allowable power range of the machine tool.

Selection of 2 milling cutter blade

For fine milling, it is better to select the grinding blade. This kind of blade has better dimensional accuracy, so the positioning accuracy of the blade in milling is higher, and better machining accuracy and surface roughness can be obtained. In addition, the development trend of milling insert used in finish machining is to grind out the chip groove to form a large cutting edge with positive rake angle, which allows the blade to cut in small feed and small cutting depth. The tool tip will rub the workpiece and the tool life will be short if the carbide blade without sharp rake angle is used for small feed and small depth cutting.

It is suitable to select the pressing blade in some processing occasions, and sometimes it is necessary to select the grinding blade. The best choice for rough machining is the pressed blade, which can reduce the processing cost. The dimension accuracy and edge sharpness of the pressing blade are worse than those of the grinding blade, but the edge strength of the pressing blade is better, and it can withstand impact and large cutting depth and feed rate in rough machining. Sometimes, there is a chip groove on the front face of the pressed blade, which can reduce the cutting force, reduce the friction with the workpiece and chip, and reduce the power demand.

In order to improve the company’s efficiency and ensure the delivery time of parts processing, it is necessary to standardize the operation methods.

2 scope of application

Applicable to the company computer gong operator.

3 responsibilities and authorities

Daily cleaning and maintenance work and training for users, correct operation and use of computer gongs.

Work content:

Clamping method and tool use standard before processing:

Press bar, vise, magnetic table, fixture, select the best clamping mode according to the applicability of the workpiece.

Laminating: pay attention to the cleaning of the burr and scrap iron on the plane of the machine and the adjustment of the height of the strip, so as to avoid the collision between the knife arm and the strip.

. vise: pay attention to the cleaning of the fixed surface and moving surface of the vice and the clamping force.

Magnetic table: when using the magnetic table, it is necessary to consider whether the bottom of the workpiece is flat, the adsorption surface should be large enough, and the processing cushion block of the workpiece edge should be blocked. In order to ensure that the process will not be loose.

① A large number of tooling is reduced, and complex tooling is not needed to process parts with complex shapes. If you want to change the shape and size of parts, you only need to modify the part processing program, which is suitable for the development and modification of new products.

② The machining quality is stable, the machining precision is high, and the repetition precision is high, which can meet the processing requirements of aircraft.

③ In the case of multi variety and small batch production, the production efficiency is higher, the time of production preparation, machine tool adjustment and process inspection can be reduced, and the cutting time is reduced due to the use of the best cutting amount.

④ It can machine complex surface which is difficult to process by conventional method, and even can process some parts which cannot be observed.

The advantages of CNC machine tools are as follows:

1. Processing efficiency, saving processing time.
2. Work intensity. After the workers have finished programming, they can go to drink tea after the first piece is qualified.
3. Reduce the number of waste products. As long as the first piece is qualified, the processed parts will generally be qualified.
4. High safety. The farther the worker is from the processing equipment, the more likely the accident will occur

1. Understand the shape and structure of parts and the corresponding graphic position.
2. Look at the benchmark of parts. Axis line, hole center line, surface, etc.
3. Look at the important dimensions, accuracy, roughness, geometric tolerance, etc.
4. Look at the technical requirements, materials, etc.

Look at the machining drawings. You need to

1. Understand the shape and structural dimensions of parts, and the corresponding graphic position of each line in the drawing. For this project, you need to learn descriptive geometry first.
2. Re learn tolerance and interchangeability, understand the machining datum plane of parts and the tolerance requirements.
3. Also need to learn mechanical drawing and mechanical principle, understand various drawing specifications, outline and design drawings of center line, shaft, transmission parts, structural parts, etc. Understand key dimensions, accuracy, roughness, geometric tolerance, etc.
4. It is also necessary to understand the expression method of materials, heat treatment and surface treatment of materials, and the description in technical requirements or technical conditions.

The machining quality of machine parts, in addition to the machining accuracy, also has the machined surface quality, which is the characterization of the integrity of the surface layer after machining.

With the rapid development of modern machine manufacturing industry, the requirements for machine parts are increasing. Some important parts must work under the conditions of high speed, high temperature, high pressure and heavy load. Any defect in the surface layer not only directly affects the working performance of the parts, but also causes accelerated wear, corrosion and failure of the parts. Therefore, attention must be paid to the surface quality problems.

报错 笔记

Computer gong is an automatic processing equipment developed on the basis of general milling machine. The processing technology and structure of the two are basically the same. CNC milling machine can be divided into two categories: without tool library and with tool library. Among them, the computer gong with tool library is also known as the machining center.

The development of science and technology as well as the rise and maturity of advanced manufacturing technology in the world put forward higher requirements for CNC machining technology; the application of ultra-high speed cutting and ultra precision machining technology has put forward higher performance indicators for CNC system, servo performance, spindle drive, machine tool structure, etc.; the rapid development of FMS and the continuous maturity of CIMS will also bring about the development of CNC The reliability of machine tools, communication function, artificial intelligence and adaptive control technology put forward higher requirements. With the development of microelectronics and computer technology, the performance of numerical control system is improving day by day, and the application field of numerical control technology is expanding day by day.

Computer gong is a kind of CNC machine tool with strong processing function. At present, the rapidly developing machining center and flexible machining unit are all produced on the basis of CNC milling machine and CNC boring machine. Both of them are inseparable from milling method. Due to the most complex process of NC milling and the most technical problems to be solved, milling has always been taken as the key point in the research and development of CNC system and automatic programming language software.

advantage:

First: when the parts of the computer gong processing are changed, the computer gong processing generally only needs to change the numerical control program, which can save the production preparation time.

Second: mass production, product quality is easy to control.

Third: the precision and rigidity of the computer gong machine tool itself is high. It can choose favorable processing amount and high productivity (generally 3 ~ 5 times of the ordinary machine tool).

Fourth: can carry out multi coordinate linkage, can process complex shape parts.

Fifthly, it has high machining precision and high processing quality.

Sixth: machine tool automation is high, computer gong processing can reduce labor intensity.

Disadvantages:

First: the computer gongs processing requires lower quality of operators and higher technical requirements for maintenance personnel.

Second: but its processing route is not easy to control, not as intuitive as ordinary machine tools.

Third: its maintenance inconvenience, computer gongs processing technology requirements are high.

报错 笔记

1. When processing parts, the protective door must be closed. It is not allowed to stretch the head and hand into the protective door. It is not allowed to open the protective door during processing;
2. During the processing of Dongguan computer gong, the operator shall not leave the machine without authorization, and shall keep a high degree of concentration and observe the running state of the machine tool. In case of any abnormal phenomenon or accident, the program operation shall be terminated immediately, the power supply shall be cut off and the instructor shall be informed in time. No other operation shall be carried out;
3. It is strictly forbidden to beat the control panel and touch the display screen. It is strictly forbidden to knock the worktable, dividing head, clamp and guide rail;
4. It is forbidden to open the control cabinet of CNC system to watch and touch without permission;
5. Dongguan computer gong processing operators are not allowed to change the internal parameters of the machine. Interns are not allowed to transfer or modify other programs that are not compiled by themselves;
6. On the control computer of machine tool, no other operation is allowed except program operation, transmission and program copy;
7. CNC milling machine belongs to large precision equipment. In addition to tooling and workpieces placed on the worktable, it is strictly forbidden to stack any tools, clamps, cutting edges, measuring tools, workpieces and other sundries on the CNC Gong processing machine tool in Dongguan;
8. It is forbidden to touch the blade tip and iron filings by hand. Iron scraps must be cleaned with iron hook or brush;
9. It is forbidden to touch the rotating spindle, workpiece or other moving parts by hand or any other means;
10. It is forbidden to measure the workpiece and change the speed manually in the process of processing. It is not allowed to wipe the workpiece with cotton thread or clean the machine tool;
11. No attempt operation is allowed;
12. When using the handwheel or fast moving mode to move the position of each axis, make sure to see the “, -” signs in all directions of X, y and Z axes of the machine tool before moving. When moving, slowly turn the hand wheel to observe the moving direction of the machine tool, and then speed up the moving speed.

CNC machining mainly refers to the use of digital information recorded on the media to control the machine tool, so that it can automatically carry out the specified processing tasks. NC machining can ensure the products to achieve high machining accuracy and stable processing quality; the operation process is easy to realize automation; the productivity is high and the production cycle is short; it can greatly reduce the process equipment to meet the needs of rapid product update; it is usually closely linked with CAD to realize the transformation of design ideas to final products. Students in the whole CNC process learning should focus on the relationship between the processes and the significance of each step. In a broad sense, the whole process consists of product analysis, graphic design, process planning, path generation, path simulation, path output, processing and inspection. In this section, a specific case is demonstrated, focusing on understanding the connection of each link. The case processing material is double color plate or plexiglass

1. Product analysis through product analysis should obtain certain composition information and some specific processing requirements
2. Graphic design the graphic design should be based on the detailed analysis of the product. For example, for the processing of the seal, we should determine the font, text size, seal type by analyzing the processing requirements
3. Process planning through the analysis of the appearance and processing requirements of the workpiece products, from the overall situation of the processing to establish each processing step reasonably. 4. The process of path generation path generation is that we realize the process planning through software, and optimize the tool path through the setting of parameters
4. After the path simulation path is generated, we generally have no intuitive sense of its final performance on the machine tool. Here we can check the possible problems through path simulation, Dongguan computer gong processing, Dongguan Mechanical parts processing, Dongguan precision computer gong processing, Dongguan high-speed computer gong processing, so as to reduce the actual processing scrap rate. The general inspection focuses on the effect of workpiece appearance, whether it is overcut or undercut, and whether the process planning of the path is reasonable
5. Path output path output is a necessary step for software design and programming to realize on the machine tool. Through the path output, the relationship between the two can be established by the intermediate reference. If the students have the professional background of numerical control, they can also understand it as the post-processing of tool path.

What is precision machinery parts processing, as the name suggests, it is a kind of mechanical processing, but more precise processing, with the development of industry and the continuous change of demand, close machining has changed a lot, its classification is more and more, its direction as long as it is more and more detailed, the direction is more and more specialized, with the development of science and technology, its technology is also constantly improved The quality and accuracy of processing are also higher and higher. With the development of science and technology and economy, the direction of machinery development is closely related