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The effect of precision machining technology

Generally in normal temperature processing, and do not cause changes in the chemical or physical phase of the workpiece, called cold processing. Generally, the processing above or below normal temperature will cause chemical or phase change of the workpiece, which is called hot processing. Cold working can be divided into cutting and pressure machining according to different machining methods. Hot working includes heat treatment, casting, casting and welding.

The technological functions of precision machining are as follows:

1. The accuracy of several shapes and orientations of parts can reach micron or angular second;

2. The tolerance of the boundary or feature dimension of the part is below micrometer;

3. The surface micro unevenness (average height difference of surface unevenness) of parts is less than 0.1 μ m;

4. Mutual fittings can meet the requirements of combining force;

5. Some of the parts can also meet the requirements of accurate mechanical or other physical characteristics, such as the torsional rigidity of the torsion bar of the float gyroscope, the rigidity coefficient of the flexible element, etc.

Key technologies of CNC machining and cutting development

In order to reduce the auxiliary time and increase the efficiency, it is required that the starting and stopping time of the main shaft of CNC machine tool CNC Mechanical and electrical engineering be as short as possible, so high starting and stopping plus (minus) speed is required. At present, the start-up and stop acceleration of the main shaft of CNC Mechanical and electrical engineering of overseas machine tools can reach above LG, and the time of full speed start-up and stop is within 1 s.

The CNC mechanical and electrical engineering spindles made by these companies have the following characteristics compared with those made in China: high power and high speed; high-speed and high rigidity bearings are selected; high-speed and high rigidity bearings are selected for overseas high-speed and compact spindles, with the emphasis on ceramic bearings and liquid dynamic and static pressure bearings; air smooth bearings and magnetic bearings are selected for unique scenes; The process level of careful processing and equipment is high; the level of supporting control system is high. These control systems include rotor automatic average system, bearing oil and gas smooth and careful control system, stator and rotor cooling temperature careful control system and spindle deformation temperature compensation careful control system, etc. On this basis, these foreign manufacturers, such as the United States, Japan, Germany, Italy, Switzerland and other industrialized countries, have made a variety of commercialized high-speed machine tools.

Development trend of spindle technology in CNC Mechanical and electrical engineering

A

Continue to develop towards the goal of high speed and high rigidity

Due to the demand of high-speed CNC machining and essential use, with the development of spindle bearing and its smooth technology, careful machining technology, careful moving average technology, high-speed cutter and its interface technology and other related technologies, the high-speed spindle of CNC Mechanical and electrical engineering for CNC machine tools has become the current development trend, such as CNC Mechanical and electrical engineering for drilling and milling, ibag in Switzerland The speed of hf42 reached 140000 R / min, and that of d1733, a PCB drilling machine of westwind company in the UK, reached 250000 R / min. The main shaft of CNC Mechanical and electrical engineering for machining center was 42000 R / min for Fischer in Switzerland and 75000 R / min for camfior in Italy. In terms of the system rigidity of CNC Mechanical and electrical engineering spindles, the system rigidity of CNC Mechanical and electrical engineering spindles is increasing due to the development of bearings and their smooth technology, which meets the needs of the development of CNC machine tools in high-speed, high-efficiency and precision machining.

B

Towards the goal of high speed, high power, low speed and high torque

According to the demand of essential application, numerous CNC machine tools can meet the requirements of Heavy CNC machining and high-speed CNC machining at the same time. Therefore, the CNC Mechanical and electrical engineering spindle of machine tool should have the performance of low speed, high torque and high power. The main shaft of CNC Mechanical and electrical engineering for machining centers made by camfior, step Tec of Switzerland and GMN of Germany is satisfactory. It is not difficult for the main shaft of CNC Mechanical and electrical engineering of Cytec of Germany to transmit torque above 200 N · m in low speed section. The main shaft of CNC Mechanical and electrical engineering of CNC milling machine and lathe of Cytec of Germany has reached 630 n · m in large torque, and in high speed section, it is usually at 10-50 kW; The great transmission power of cyteccnc CNC CNC Mechanical and electrical engineering spindle is 50 kW; the great power of Swiss step teccnc mechanical and electrical engineering spindle is 65 kW (S1), which is used for aircraft manufacturing and mold processing; and the report of CNC Mechanical and electrical engineering spindle power reaching 80 kW is more.

C

Further development to the goal of high precision, high reliability and long working life

Users put forward higher and higher requirements for the accuracy and reliability of CNC machine tools. As one of the core performance components of CNC machine tools, CNC Mechanical and electrical engineering spindle requires higher and higher accuracy and reliability. For example, the radial runout of the main shaft is within 0.001 m m, and the axial positioning accuracy is below 0.5 μ M. At the same time, the service life of CNC Mechanical and electrical engineering spindle has been lengthened and its application reliability has become higher and higher due to the selection of special and careful spindle bearing, advanced smooth mode and unique preload application mode. Step TEC’s CNC Mechanical and electrical engineering spindle is also equipped with acceleration sensor to reduce the vibration acceleration level of bearing. In order to monitor and limit the vibration on the bearing, a vibration monitoring module is installed to prolong the working life of CNC Mechanical and electrical engineering spindle.

D

The performance and mode diversification of the spindle’s built-in electromechanics in CNC

In order to meet the demand of essential use, the performance of spindle motor in CNC Mechanical and electrical engineering has been improved. For example, the ratio of constant torque and high speed to constant power and high speed (i.e. constant power speed regulation boundary) delivered by Fischer spindle motor in Switzerland has reached 1:14. In the rest, permanent magnet synchronous motor CNC Mechanical and electrical engineering spindles appear. Compared with asynchronous motor CNC Mechanical and electrical engineering spindles of the same power, the appearance size of synchronous motor CNC Mechanical and electrical engineering spindles is small, which is conducive to increasing power density and completing small size and large power rate.

E

Start and stop the response quickly

In order to reduce the auxiliary time and increase the efficiency, it is required that the starting and stopping time of the main shaft of CNC machine tool CNC Mechanical and electrical engineering be as short as possible, so high starting and stopping plus (minus) speed is required. At present, the start-up and stop acceleration of the main shaft of CNC Mechanical and electrical engineering of overseas machine tools can reach above LG, and the time of full speed start-up and stop is within 1 s.

Technological process of precision parts processing mould

The process of precision parts machining is the process of mould manufacturing, which transforms the design of mould parts into the products of mould parts. It includes the work of design, parts manufacturing, standard parts purchasing, mould equipping and mould test acceptance. The following is the process of precision mould parts machining explained by a small editor.

The key mission of discussing the manufacturing process of precision parts mould is to discuss the possibility of mould manufacturing and how to deal with the problem of mould manufacturing. A mould is composed of several parts. The fundamental prospect is to seek the processing of precision mould parts with low cost, short cycle and high quality. Cost, cycle and quality are the key economic and technical indicators of mold manufacturing. We should not study the three indicators alone, but should study them comprehensively, so that the three links of design, manufacturing and application are in harmony with each other.

In the design, we should not only study the application performance, but also fully study the feasibility of manufacturing; in the manufacturing, we should meet the design requirements and guide users to use. Design and manufacturing also need to understand to make the design convenient for manufacturing under the condition of meeting the application performance; the detailed process of mold manufacturing is as follows:

The above is all about the technological process of precision parts processing mold. If there is a need for processing design, please call us.

How to choose high efficiency CNC production line

At present, the varieties of CNC processing lines include rigid automatic line and flexible CNC processing line. Which kind of CNC processing line is located in the CNC processing field should be confirmed according to the change of products and output. If it is a large number of production, and is mature production line, then should choose rigid line, because the working efficiency is high. However, if it is a small and medium-sized batch, and the product has certain transformation, then flexible line should be selected, because the process of this production line is a set of control, and has strong suitability.

Other factors, such as the change degree of CNC production line, product life cycle and product change, are also what we need to study when choosing production line. In this respect, the flexible production line is better than the rigid production line, because it is more sensitive, more suitable, and can reduce the investment crisis.

At present, there is a new method of CNC machining production line, which is the combination of automatic line and flexible CNC machining center, resulting in the production line, which is mainly the automatic production line, to ensure the processing accuracy and the stability of the production line. For other processes, CNC machining is used. This production line also has certain advantages, so there will be, but also according to the nature of the situation to determine whether it is appropriate, can not be confused to use.

Precision parts processing can meet your requirements

We will use many parts in our life, that is to say, we will use many parts when we use many machines. But our parts can’t be precise occasionally. At this time, we might as well go to buy precision parts. Why? Because a original precision part might as well be worth a lot of our ordinary parts. Without this good precision part, many of our machines would be very difficult to use.

But we often have such things, that is, we will occasionally find our own precision parts are still not good. Take the car for example, if our car breaks down, we go to buy parts, buy precision parts and find that it still cannot meet the requirements of our car. Then you need such equipment for precision parts processing, that is to say It is such a simple thing to process the precision parts you still buy and then meet the requirements of your machinery.

Precision parts processing, to meet any requirements of your machinery.

The influence of ultra precision CNC machining technology

Ultra precision CNC machining technology has significant economic benefits, social benefits and market demand prospects: ultra precision machine tool is the carrier of high-level CNC machining technology, with high development cost, long cycle and high value of each machine. If it can replace the import of an ultra precision machine tool, it will save millions of dollars; if the value of its annual machining creation is calculated, the economic benefits are significant.

Ultra precision CNC machine tool is an indispensable equipment for the development of national defense cutting-edge and high-tech products. It has always been regarded as a strategic material by some powerful family property countries and is banned for export. If China does not develop its own machine tool, it is difficult to buy it if necessary, so the social benefits are great.

With the development of science and technology and people’s economy, the demand for ultra precision machining technology is becoming more and more superior, and the market is expanding. Its application is not limited to the cutting-edge of national defense and aerospace, but has expanded to various boundaries. Its application scale and demand are larger, so the market demand prospect is optimistic. The detailed analysis is as follows.

The use of CNC processing is becoming mediocre and the market demand is expanding. The boundary of ultra precision CNC processing technology is becoming more and more mediocre, which is used in the boundary of high-tech technology, military property and civil property. Therefore, it is an indispensable skill for the development of high and new technology and products.

Machining quality of precision parts is expressed by machining precision

Machining quality of precision parts is expressed by machining precision

1、 Interchangeability of parts

According to the precision parts manufacturer, after long-term production and operation, some parts will inevitably wear and deform and be scrapped, replacing with new parts. These parts are called accessories or spare parts. Accessories or spare parts without repair or selection, installed on the machine can run, known as exchange.

In order to achieve interchangeability, when manufacturing parts, we should make the size and geometry of the parts as a whole. The so-called “all in all” does not require that the score is not poor at all (it is neither economical nor possible to do so). As long as the size and geometry of the parts are controlled within a promised boundary, so that the parts and other parts have the same fusion function after fusion. The promised deviation line is the official of form and position.

2、 The machining quality of precision parts is expressed by machining accuracy:

1. Geometric form accuracy

The accuracy of geometric form refers to the accurate level of geometric form such as the surface or axis of the part, such as whether the line is straight, whether the surface is flat, and whether the normal section on the cylinder is round, etc. The allowable change boundary is expressed by “shape and position yamen servant”. The smaller the number of shape and position yamen servant is, the higher the form accuracy is.

2. Dimensional accuracy

According to the analysis of precision parts processing factory, dimensional accuracy refers to the accurate level of the dimension after the parts are processed, which is represented by “dimension yamen runner”. When the dimensions of the parts are the same, the higher the accuracy, the smaller the Yamen number.

3. Position accuracy

According to the precision parts manufacturer, the position accuracy refers to the accurate level of the mutual position between the surfaces of the parts, such as whether the two planes are parallel, vertical, and whether the two axes are coaxial.

The Yamen servants in the above forms and positions are referred to as “yamen servants in shape and position”.

CNC machining tools improve machining process

The development of new CNC milling cutter provides CNC machining tools with higher cutting strength and easier use for CNC machining center and milling machine. With the development of design and manufacturing technology, the sophisticated cutter body and blade can be used to improve the fraud rate of machine tools, increase output and increase the reliability of machining process.

Normalization is very important for manufacturing industry, because only through normalization can CNC processing technicians communicate in the same language and understand the limits of use. However, in some cases, the criteria may slow down or even hinder the development of products. At this time, it is necessary to get rid of constraints, break barriers and introduce better plans. One example is the development of CNC milling cutter.

For many years, users have followed the rules and regulations and exchanged CNC milling cutters and blades made by various CNC machining tool manufacturers. However, these guidelines have made various restrictions on CNC machining milling cutter and blade, including blade form, thickness, internal circle of cutting blade, size of blade holder and wedge clamping piece, and size of cutter body. Due to the limited design boundary of blade material, cutting edge and chip breaking groove, the suppliers and products of CNC machining tools that abide by the rules are limited by machining functions.

Today, however, CNC milling cutter meaning tends to be sensitive, which provides CNC cutting tool developers with the freedom to choose new CNC machining tools and blade designs. These designs may be optimized. Using new CNC machining tool meaning, it may be better to process the safety, accuracy, surface quality, metal removal rate, CNC machining tool overhang, high-speed cutting, and differential cutting path The strength of the path.

Today’s milling CNC machining tools are constantly optimized to meet the needs of modern manufacturing, machine tools and raw materials, and adopted by all industries. Of all CNC milling cutter products supplied by Sandvik Coleman, about 80% are coromill CNC machining cutters, most of which have been developed in the past 10 years. Compared with the old product, the new CNC machining tool has several times faster metal removal speed, smaller cutting force and better orientation. Its typical runout is only a fraction of that of the old CNC machining tool, so it can always control the machining yamen runner within a smaller boundary, and the cutting edge wear is smaller and more dream. The axial and radial runout are very small, which means that the accuracy of cutting edge is increased, so the surface quality of workpiece is better, yamen service is smaller, the service life of CNC machining tool is longer, and the distribution of cutting load is more average, so as to increase the cutting speed, reduce noise, vibration and wear.

CNC machining tools can also help to increase spindle speed, high-speed feed and hard part milling, and expand the opportunity of dry cutting. The design of these CNC machining tools is more simple, and the amount of work required for adjustment and care is very little. The cutter body is rigid and accurate in size, which is made of pre hardened steel to ensure that the cutter blade is accurately and stably installed on the CNC milling cutter body, and the appropriate pitch can be selected according to the different use scenes.

The new CNC milling cutter uses the blade material and groove type developed for specific raw materials or processes. The function and achievement of the new CNC milling cutter equipped with these blades are far superior to the ISO or ans standard CNC machining cutter and blade. Compared with numerous standard blades, modern new blades and CNC machining tools can provide larger positive rake angle and more complex groove shape, thus reducing cutting force, resulting in faster and more stable synergistic effect of metal removal.

The use of outdated milling CNC cutting tools will bring important consequences to the economic benefits of machining and production safety. If the machining enterprises continue to use the milling CNC cutting tools that have fallen behind the development of new technology, they will gradually lose their manufacturing strength and competitiveness. And if only buy advanced milling machine, but not enough to update CNC machining milling cutter and blade, it’s like a shallow taste, halfway back.

The development of cutting CNC machining tool technology and CNC machining strength, as for those manufacturing enterprises that still use outdated special milling CNC machining tools, boring CNC machining tools or special CNC machining tools, means an increasing potential space. These CNC machining tools are often specially designed and used in the process of a certain part or series of parts, which means that when they are used as the turning CNC machining tools of machining center, any standard on a part needs to be processed with a different CNC machining tool.

Features and principles of die casting die

Application features of die casting die:

1) The metal liquid enters the mold cavity under high pressure and high speed, which causes severe conflict and impact on the surface of the mold cavity, causing corrosion and wear on the surface of the mold.

2) Molten metal in the process of pouring is inevitably brought in by slag, which has complex chemical effect on the surface of forming parts. The compound of aluminum and iron is like a wedge, which accelerates the cause and development of die casting die cracks.

3) Thermal stress is the key reason for the surface cracks of die-casting parts. In the production process of each die-casting, apart from the high-speed and high-pressure erosion of metal liquid, the surface of the formed parts also absorbs the heat released by the metal in the solidification process, which results in heat exchange. Due to the heat conduction of the die material, the temperature of the surface layer of the formed part rises sharply, and there is a large temperature difference between the surface layer and the internal layer, thus the internal stress occurs. When the metal liquid fills the cavity, the surface of the cavity first reaches high temperature and expands, while the inner mold temperature is low and the relative expansion amount is small, which causes the surface pressure stress. After the mold is opened, the surface of the mold cavity contacts with the air, which causes tensile stress due to the cooling of shrinkage air and coating. This kind of alternating stress increases with the continuous production. When the fatigue limit of the die material is exceeded, the surface layer of the die will be plastic deformed and crack will occur.

Selection principle of working temperature of die casting die:

1) The mold temperature is insufficient, the internal structure of the casting is loose, the air is troublesome, and it is difficult to form.

2) The mold temperature is too high, the internal structure of the casting is compact, but the casting is easy to be “welded” and attached to the mold cavity

It is not easy to unload the casting. At the same time, too high temperature will make the mold expand and affect the dimensional accuracy of the casting.

3) The mold temperature should be selected within the appropriate boundary, usually after proper test, thermostatic control is better

The above content is introduced here first. If you have any other questions, please contact us directly. We will serve you wholeheartedly.

A summary of the causes of collision in CNC machining center

When doing CNC machining, we often encounter the problem that machining center collides with the machine, which will not only affect the machining efficiency, but also may destroy the workpiece, more likely to form personal events. So what are the causes of CNC machining center collision?

（1） Cutter compensation input error is a common cause of collision

1. Coordinate offset 60 Li input error

2. Input error such as workpiece coordinate g54

3. Length G43 compensates for H input error or call error

4. Radius G41 compensates for D input error or call error

5. G40 or G49 or g80 input error

（2） Error manipulation

1. Wrong procedure

2. Install the wrong knife

3. Wrong machining coordinates

4. Power on without returning to the original point

5. Handwheel or manual target error

（3） Unique programs can also cause crashes

1. There is more than one tool change in the program (it will collide with the machine due to tool compensation error)

2. The program will return to the cutting point (pressing plate or screw) after cutting at the mechanical reference point

3. The program starts with a slash (Z appears in front of H)

4. Lower safety height (pressing plate or nut)

Do you remember the above reasons? I hope you will pay more attention when you work.

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