In many CNC milling machines, a number of transmission shafts, gears and bearings are still used in the gearshift system of the spindle, so it is inevitable to produce vibration noise, friction noise and impact noise in the work. And the transmission of the main transmission system of the CNC milling machine is completed by the computer control in the state of the machine tool without stopping work, so it is more continuous and representative than the noise produced by the ordinary machine tool.
One, analysis of main shaft noise fault
In many CNC milling machines, a number of transmission shafts, gears and bearings are still used in the gearshift system of the spindle, so it is inevitable to produce vibration noise, friction noise and impact noise in the work. And the transmission of the main transmission system of the CNC milling machine is completed by the computer control in the state of the machine tool without stopping work, so it is more continuous and representative than the noise produced by the ordinary machine tool.
The noise of a numerical control milling machine is larger in the first use, and the noise source is mainly from the main transmission system. With the longer use time, the noise is getting bigger and bigger. The noise is measured with the sound level at the speed of the spindle 2000r/min, and the noise is 85.2dB.
Fault inspection and analysis
Mechanical system is subjected to any external excitation force, and the system will vibrate in response to the excitation force. This vibrational energy propagates throughout the system, and when transmitted to the radiation surface, the energy is converted into a pressure wave, which is transmitted again through the air, that is, acoustic radiation. Therefore, the three steps of excitation response, system internal transmission and sound radiation are the formation process of vibration noise, friction noise and impact noise.
When the main transmission system of the CNC milling machine is made, it is due to the excitation response of the gear, bearing and other parts, and the noise appears in the transmission and radiation of the system, and these parts increase the exciting force and make the noise increase because of the abnormal situation.
(1) analysis of gear noise. The main transmission system of CNC milling machine is mainly based on gear to complete the transmission and transmission. Therefore, the meshing transmission of gears is one of the main sources of noise.
The noise generated by gears in the main drive system of machine tools mainly includes:
(1) in gear meshing, a continuous impact between teeth and teeth causes the gear to generate forced vibration and impact noise at the meshing frequency.
(2) because the gear is subjected to external excitation force, the natural frequency of the gear is generated by transient free vibration and noise.
3. Because of the eccentric assembly of gears and transmission shafts and bearings, the inertia force of rotation is not balanced, resulting in low frequency vibration consistent with the speed. With the rotation of the shaft, a resonance noise is emitted at each turn.
Because of the friction between teeth and teeth, the self-excited vibration of gear and friction noise are generated. If the tooth surface is uneven, it will cause rapid periodic impact noise.
(2) analysis of bearing noise. The spindle speed changing system of the CNC milling machine has 38 rolling bearings. The assembly, pretightening force, concentricity, lubrication conditions and the size of the load on the bearing and the radial clearance have a great influence on the noise of the bearing and the shaft neck and supporting holes. Moreover, the manufacturing error of the bearing itself determines the noise of the bearing to a large extent. The most easily deformed part of rolling bearing is its inner and outer rings. Under the influence of external factors and its own precision, the inner and outer ring may produce the vibration of swaying vibration, axial vibration, radial vibration, radial vibration and axial bending vibration of the bearing ring itself.
With the same gear, the higher the speed of the bearing, the greater the frequency of the rotary base, and the noise will increase the accuracy of the inner ring of the bearing rolling, if it is not high, it will become the main factor affecting the noise of the bearing, and the inner and outer rings of the roller or bearing are many, and the high harmonic waves of these frequencies are shown on the spectrum. The higher the noise is.
Two, the malfunction of the spindle noise
1. gear noise control
Because the noise of the gear is caused by many factors, some of them are the characteristics of the gear noise in the spindle motion system, which is determined by the parameters of the gear design. On the basis of the original design, it is repaired and improved on the original gear to reduce the noise.
(1) tooth top repair edge. Due to the influence of tooth shape error and pitch, elastic deformation of the gear tooth load causes instantaneous collision and impact. Therefore, in order to reduce the meshing impact caused by the concave and convex tooth crown, the gear top can be trimming. The purpose of margin modification is to correct the bending deformation of gears and compensate for gear errors, so as to reduce gear noise. The trim margin depends on the pitch error and the bending deformation of the rear gear, and the bending direction. The trim margin is mainly aimed at the gear pairs with the highest engaging frequency of the machine tool and the different trim margins adopted by these gears when the modulus is 3, 4, and 5mm. In order to repair the edge, we must pay attention to the control of the repair edge, and take the method of repeated test, so as to avoid the excessive repair of the working tooth profile, or when the margin is too small to repair the edge of the tooth, it can only repair the tooth top or only repair the tooth root according to the specific conditions of these pairs of gears, only repair the tooth top or repair the tooth alone. When the roots fail to achieve good results, the radial and axial values of the margins of the teeth and the roots can be allocated to a gear.
Maintenance method of spindle noise malfunction of CNC milling machine
Precautions for the use of stainless steel chain plates
Stainless steel conveyor chain plate belongs to the transmission parts, sometimes it is easy to wear in the application. If the wear is serious, the service life will be affected. For normal use, a series of work needs to be done to extend the service life.
In general practice, in order to prolong the service life of the stainless steel conveyer chain plate, a sealed refueling lubricating device is adopted. The device can save 5~10% and reduce the noise. 4 wearable plates can be installed at the bottom, the bottom is more wearable and the resistance is smaller. The strength of the whole scraper chain is high. The scraper chain uses the outer chain plate bending instead of the steel bar in the middle of the chain plate. It can solve the defects of the original steel bar welding, and can effectively meet the loss caused by the high load operation of the chain plate, and the service life is longer.
Introduction of laser engraving application industry
More and more conferences, tours, medals, certificates, souvenirs and advertising materials are widely used in carving. In pens, leather goods, tableware, lighter, watch, bottle opener, key chain, cup, award plate, imitation crystal pendant, golf clubs, shotguns, rings and other articles, it can embody taste and personality. It caters to bookmarks, cartons, pendants, frames, silver and other articles with rich and interesting engraving. People need to communicate with each other.
The carving and cutting machine can digitize the woodwork and furniture processing, such as setting out, punching, slotting and cutting edge, and improving the repeatability and standardization of the product, and greatly improving the rate of finished product and production efficiency.
Carvings and engraving plates are still an irreplaceable printing technology in some specific fields. Mechanical engraving machines can be competent for most of the work of carving wooden plates. The mechanical engraving offset is not as harmful as laser engraving. In the background of advocating green environmental protection and the progress of Guan Xinzhen’s love for life Mechanical engraving is a modern offset carving method worthy of promotion.
The bamboo craftwork carved by laser can show the artistic style and the evolution of the school of calligraphy in the times. It has an unparalleled appreciation and collection value. It is a good gift to the high friends. Bamboo carving crafts such as laser engraving, celebrity handwriting and so on are exquisitely made. They have become the collectors of scholars and businessmen.
All kinds of pen boxes and business card boxes carved by laser have become the desk materials for scholars, politicians and business people.
Through the laser engraving and cutting machine, all kinds of scriptures, celebrities’ original maps, images and so on are reproduced on boards of various materials, and they are lifelike and lifelike.
It can be processed in bamboo, crystal, horn, paper, plexiglass, marble, cloth, leather, rubber, plastic and other non-metallic materials.
The technical features of hardware and furniture accessories
Everyone in the purchase of furniture should do serious inspection, which can not be ignored one of the contents of the hardware furniture fittings inspection, furniture hardware accessories are the important parts of furniture production, its price will also affect the price of furniture. How much is the price of hardware furniture accessories? What are the technical features of hardware furniture accessories?
Hardware and furniture accessories price
1, the wardrobe hinge, also known as hinge, is the hinge of the professional name. It is a part that connects the two parts of the object and enables it to move. In the selection of the page, we should pay attention to the fine and smooth electroplating on the surface of the hinge. These are also the factors that determine the price of the page. According to the specifications and routes, the price of the wardrobe in the market is from 10 yuan to hundreds of yuan, and it is generally possible to use 30 yuan up and down.
2, the stainless steel hand in the wardrobe is also a lot of use, the appearance of stainless steel hand design is very delicate, simple fashion, smooth and bright, can fit the request of home decoration. The price will not be too expensive about 15 yuan, the aluminum alloy hand is now a wide use of the market, strong through use, can be used for a long time, and will never fade, can be fine carve, the price is much lower than the stainless steel, generally 8, 9 yuan. Others are copper, ceramics, logs and other wardrobe handles, but not very common, and the price is much higher.
3. The installation of the wardrobe damper is very simple. As long as it is installed on the upper guide of the cabinet door and five to seven centimeters from the side board of the wardrobe, the wardrobe damper will gently pull back to the side board as long as the door of the cabinet touches the cable wardrobe damper. It can effectively avoid the function of the closet and close the closet. At the same time, the wardrobe can be avoided and the wardrobe can be avoided. Some damage. Wardrobe dampers have different materials, such as PVC, stainless steel, aluminum alloy, and so on. The price varies from several yuan to tens of dollars.
Technical features of hardware and furniture fittings
1, double pulley has the effect of wear-resisting and noise elimination. There are two pulleys parallel sliding to further ensure that the push and pull is quiet, smooth and stable. In addition, a good pulley is often designed to have two anti jump devices to ensure that the door is reliable and safe when the door is slid. The poor pulley is often only a skipping device, and even there is no skipping device. It is easy to derailment when it is used, and it is difficult to ensure safety.
2. The pulley guide is the core technology part of some furniture. It must endure repeated friction, so the guide must be high strength and wear resistant. The track matching pulley is also very important for the use of sliding doors. Generally, there are two kinds of tracks for sliding doors: cold rolling steel track and aluminum alloy track.
3, the components of hardware furniture fittings can be roughly divided into two types: one is aluminum alloy, the other is plastic steel (Tan Gang). Because aluminum alloy has the characteristics of light weight and high strength, it is the main material of hardware furniture accessories, and has gradually replaced plastic steel products. Aluminum alloy itself is divided into ordinary aluminum magnesium alloy and aluminum magnesium titanium alloy. It has higher strength and smaller weight, has the advantages of anti oxidation and corrosion resistance, which is favored by consumers, but the cost is several times that of ordinary aluminum and magnesium alloys.
Hardware and furniture accessories price according to different uses, and material and brand different, price is also some difference, this is everyone in the selection of furniture products should also pay attention to, and some information to do a good understanding. The above introduces the price of hardware furniture fittings and the technical characteristics of hardware furniture fittings. These are also important knowledge when furniture is selected.
What is the difference between the five axis engraving machine and the three axis engraving
The biggest difference between the five axis engraving machine and the five axis machining center lies in the function of his province. The five axis machine tool has the functions of the arc surface machining, the special shape carving, the side punching and repeated positioning.
YD-10000 side
Three axis machine tools have his unique advantages, such as high cost performance, fast processing plane and so on. It has long occupied a blue sea in the market. It is deeply trusted and supported by users. It has made great contributions to the intelligent processing industry. With the continuous development of science and technology and the continuous improvement of the quality of technical personnel, people have a new understanding and understanding of the five axis machine tools. At first, it was used by the national institutions in important areas of the country, such as the aero engine impeller, the development of military weapons and other important applications, and gradually popularized to the civil market, such as the processing mould industry, and the automobile system. In many fields, such as manufacturing industry, craft carving industry, etc., here, Xiaobian makes a brief account of the characteristics of five axis machine tools.
1: ball processing, five axis linkage, the ball workpiece can be processed in all directions, to make up for the three axis machine can only be processed in the plane defects and deficiencies.
2: side processing, five axis machine tool can effectively carry out side dragons, tapping, carving and chamfering and other work.
3: does not need multiple positioning. It can be formed at one time, reducing the error caused by repeated positioning, ensuring machining accuracy and processing speed.
The five axis linkage can be used to engraving the machined workpiece in all directions, making up for the defects of the three axis, which can not be processed in many positions, reduce the cost of artificial repair, improve the quality of the product, reduce the cost of labor, and provide help for the enterprise to create wealth.
5: expansion and upgrade space is wide, five axis machine tool configuration system mostly supports PLC programmable function, the system axis can be extended to 64, programmable interface is infinite, with strong expansion and upgrade, is a good helper for enterprise development.
What problems should be noticed in the use of stainless steel chain conveyor
Stainless steel chain conveyor is a commonly used conveyance. It has extensive application in all industries, such as chain conveyor, belt conveyor, belt conveyor and so on. In many industries, they can see their figure, but no matter which conveyor in use, it needs to pay attention to some items. Today, I will tell you about the matters needing attention in the process of using the stainless steel chain conveyor in the process of using the conveyor. We know what the chain conveyor needs to pay attention to, and the other conveyor also knows what to pay attention to.
When the stainless steel chain conveyor is started, the conveyor should not be too fast to accelerate. Another is gear not to wear, chain wheel and chain to standard matching, running normally.
Axial channeling ensures that the chain plate deviation is the main reason for the operation of stainless steel chain conveyor. If the axial channeling is too large, then the chain conveyor will appear deviation phenomenon or idler crack in the running process. The flexibility is the guarantee of the resistance reduction of the stainless steel chain conveyor in operation. If the flexibility is not good, the stainless steel chain conveyor will need more power to drive in the process of use, which will cause the waste of electric power and even burn the motor. One other is that the chain plate conveyor is usually made of gray iron or malleable iron. This kind of chain conveyor is usually suitable for conveying hot sand material. If the material is to be transported with corrosive material, the material of corrosion resistance should be made with the material of corrosion resistance to make the conveyor chain.
The above is the stainless steel chain conveyor used in the process of the use of a number of matters, no matter what conveyor, only when the use of more attention, can reduce the occurrence of failure. I want to know more about chain conveyor.
Advantages of laser marking machine
Eight advantages of laser marking
Laser marking has low cost, high flexibility and can be controlled by computer system. The strong and permanent character of the mark produced by laser on the surface of the workpiece is its prominent feature. At present, in marking printing industry, laser marking has occupied more than 90% of the market.
Laser marking machine has such a large share, because it has the following eight advantages: 1. permanent, 2. anti-counterfeit, 3. non-contact, 4. applicable, 5. engraving precision, 6. running cost low, 7. processing efficiency of high speed computer controlled laser beam can move high speed (up to 5~7 M / sec), marking the mark The process can be completed in a few seconds. The 8. development is fast due to the combination of laser technology and computer technology. The user can realize laser printing output as long as it is programmed on the computer, and can change the printing design at any time. It fundamentally replace the traditional mold making process, and provide the convenience for shortening the product upgrade cycle and flexible production. Profit tool
A few things that the shop will have to do every day
One, landings
It is better to set it as an automatic start item and keep the Millennium online every day. According to statistics, more than 99% of the transaction sheets are online more than 8 hours on average. It is like having a special person to keep a store. By the time there is a new product, you can send your latest news to them at the first time, maybe there will be a few transactions in it, and most importantly, you can send your product information to your old customers at the fastest speed.
Two, take care of the shop
Decorate shop, upload new product information, optimize old product information. It is better to send several new products every day. If there are no new products to be issued, delete new products with fewer products. The new product has a certain ranking advantage.
Three, peer comparison
Every day to pay attention to the top 10 key words you choose, you go to the 1688 page search inside search them, and then from the price, from the quality, from the quality of information, from the service attitude, from the picture quality to compare with them, find your deficiencies, find you and their differences, find your advantages, and then wrong, and then wrong Marketing, so you can stand out in your peers and eventually reach your goal, so no matter how busy you are, be sure to stare at your opponents, and they are going back, paying attention to them, biting them and surpassing them.
Four. Focus on keyword data
Every day to check your choice of the heat of key words, every day to see if these key words are ranked in the forefront, every day to see your competitors with what key words in the front, every day to think of your customers will use what keywords to search your product, every day to optimize your customs according to these information. Key words;
Five, every day to compare the following information:
1. browse volume;
2. click rate (when you say hello, you can see what products your customers are browsing).
3. sales
4. products with the most clicks
5. which cities do the customers come from, such as Guangdong, Zhejiang, Shandong and other countries?
It’s crucial to find your sales focus in each of the different data and find your way of selling.
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