CNC Machining China blog - Precision CNC Machining Solution for Metals

Through calculation and statistical results, a preliminary conclusion can be drawn after synthesis: For a large hump with heavy workload, the average number of brakes in one part of the reducer is about 300,000 vehicles per year, and the maximum is up to 500,000; the second part decelerates The average number of braking vehicles per year is about 7 million, and the maximum number of vehicles is 250,000; the average number of braking vehicles per year for the three-part reducer is about 40,000, and the maximum number of vehicles is 70,000. For small and medium hump reducers, the number of actions will be significantly reduced. Life analysis of the whole machine, wearing parts, and wearing parts. The life of the reducer. The three-part reducer generally has a design life of 100,000 vehicles. Calculated based on the number of vehicles braked by the above-mentioned reducer per year, the minimum useful life is 14 years, and the average useful life is 25 years.

Improve the heat transfer performance of the radiator. Compared with the series-fin reinforced radiator, the tube band radiator has the following main features. Heat dissipation port 2. When the air resistance of the tube-belt radiator can be reduced but the heat transfer coefficient increases, the heat transfer performance of the two radiators is compared. The characteristic of the tube-belt radiator tube belt is called the enhanced series fin radiator. The key element of the tube-belt radiator is the corrugated belt, which is sectioned or not sectioned into a certain angle during rolling. Of wrong mouth shutters. In this way, it is beneficial to thin the adhesion layer of the airflow boundary layer on the corrugated belt, which can greatly increase the heat release coefficient of the air side, thereby saving copper tube. Compared with the reinforced radiator, each section can save the bottom of the copper tube plate. Including the reinforcement plate, eac

The automobile filter has a cylindrical shape with a pleated filter paper inside in order to have a larger filter surface in a certain volume. Another structure is composed of spirally wound crepe paper, which is mainly used for fuel oil filtration. The filter of this structure can be regarded as a special case, which is different from the most widely used pleated paper filter. Most filter papers are impregnated with resin, and the base paper has a great influence on the determination of filtration performance, while the resin imparts structural strength, so that the filter paper will not be damaged during the process of making the filter and under the final application conditions. Paper is a web composed of cellulose fibers or other fibers, which is formed by copying from an aqueous suspension of these fibers. The choice of fiber is very important. The general rule is to obtain the best combination of physical properties (permeability, strength, thickness,

Car engine and air-conditioning system have poor heat dissipation, causing the water temperature to be too high, which will cause the following failure phenomena: 1. When the traffic is not smooth-traffic jam or idling for a long time, the engine water temperature gauge shows too high, the electronic fan works for too long at high speed, the engine noise increases, and the temperature is too high when the air conditioner is turned on and the fault* is obvious. 2. When the air conditioner is turned on when the temperature is too high, the idling speed is unstable and the speed fluctuates too much, the acceleration is weak, and the engine makes abnormal noise. 3. After a hot car is turned off for more than ten minutes, it is not easy to get on the car when starting; sometimes it will automatically turn off when a hot car is driving. 4. The air conditioning refrigeration temperature is very cool when the car is cold, and the cooling effect of the air condit

Deep hole machining is the machining of holes with a ratio of hole depth to diameter greater than 10. In the machining industry, more holes are processed, but it is difficult to guarantee the tool life and the quality of the processed parts in the processing of deep holes. Solving the problems encountered in deep hole machining in machining and improving processing efficiency are the main research directions of deep hole machining. On the one hand, deep hole machining needs to choose suitable cutting tools to improve processing parameters. On the other hand, it is also necessary to choose a suitable and ideal lubrication system, because choosing a suitable and ideal lubrication method can improve the life of cutting tools and the quality of processed parts. . At the same time, it can also reduce the pollution of oil pollution to the environment and the harm to the human body. <br /> In deep hole drilling, traditional lubrication technology uses a large

  There will be unprecedented fierce competition in the domestic market for auto parts. In the face of this new change, the member factories of the “Automotive Federation” must actively prepare for the challenge. Make use of strengths and avoid weaknesses, and give full play to group advantages. In recent years, the member factories of the “Jin Auto Union” have gained a place in the auto parts industry market based on product quality, reputation and service attitude, and won the trust of the majority of users. However, some member factories are agricultural machinery system enterprises after all, and their product sales are affected. However, the agricultural machinery system has more than 200 agricultural machinery parts sales departments above the county level. In recent years, under the situation of reform and opening up, most of these sales departments have carried out the business of auto parts, and there are many sales departments dealing in auto part

　The easier way to check the frame is to use the frame gauge. The frame gauge is actually a set of observation needles. During inspection, hang the frame gauges at several different positions on the frame. When using, the three gauges must be used at the same time. The more gauges, the more accurate. If the frame is not deformed, the side needles of the frame gauges should be aligned during the inspection. If the observation needles are not aligned, it means the frame has been deformed. Plate steel plates between the tools as shown in the figure to avoid local stress and deformation. If the frame is accurately inspected, you can use a plumb hammer to draw the frame on the floor. This work must be very precise. The floor must be level and clean. If necessary, paste or nail paper on the floor, and use a plumb hammer in the car. The measurement points on the frame are projected on the ground, and then the distance between the points on the ground is measured by

If the signal from each input sensor or switch indicates that the engine cooling water temperature is lower than 24C, or the following situations occur, such as the throttle valve is suddenly opening and closing or even completely closed, the atmospheric pressure is lower than 66.66kPa, the car is braking, When the car is downshifting from fourth gear to second gear and upshifting from second gear to third gear, the lock-up clutch will not be locked. In addition, because the failure of the input device (such as a sensor or switch) will endanger the function of the electronic control system, the system will automatically switch to the failure mode control state when an input sensor or switch fails. The lock of the lock release has occurred. Similar to Chrysler’s approach, when the engine cooling water temperature rises above the prescribed lower limit (24°C), the throttle position sensor and the vehicle speed sensor will become the key input devices that de

  The heat treatment process of auto parts consumes a lot of energy, so it is necessary to work to reduce the energy consumption in each treatment stage, which includes furnace improvement, carburizing process control, quenching medium, cooling rate, etc. However, the operation of these processes is directly related to the properties and hardenability of the processed steel with different compositions. In order to meet the requirements of advanced heat treatment technology, various types of steel have been studied from smelting. The improvement of these steels and related technology has greatly improved the performance and processing productivity of auto parts. The chemical composition and hardenability of steel are the key factors to obtain the best heat treatment effect for auto parts. In order to obtain high-quality small-modulus gears in automotive products, it is necessary to carefully control the surface and core hardness of the gears. The developmen

Our previous article has given a detailed introduction to tire maintenance. *Recently, the editor has learned some neglected tyre knowledge, and I want to share it with you here. The tire production date will be distinguished, but also anti-counterfeiting: Tires are rubber products, so rubber aging will also occur. The shelf life of tire rubber is generally 4-5 years. Tire rubber will accelerate aging after the shelf life and cause tire performance to decline. As shown in the picture above, “9MCR0810” is the tire production date code. Among them, the “0810” in the last 4 digits of * indicates that this tire is a product produced in the “8” week of the “10” year. will look at the tire production date does not mean that the tire you buy must be new. Some unscrupulous businessmen modify the production date markings on tires through special molds, and sell tires with expired inventory as brand new tires, earning a high price difference. Generally speaking, u

  The current layout of the radiator, fan and partition in the air intake compartment in the engine compartment is unreasonable. For example, there is a vortex in front of the radiator. L1 is not fully utilized, and the actual flow to the engine working area is very small, and the flow velocity is very low, resulting in poor convective heat transfer efficiency and poor heat dissipation in the engine compartment. In the improvement plan of the engine compartment layout, consider changing the orientation of components such as radiators and fans, changing the fan to face the engine body instead of the rear door, and removing the partition of the air inlet compartment in Zone A, which can effectively The high-speed air flow from the fan is used to improve the efficiency of convection heat transfer in the cabin and improve the heat dissipation performance of the cabin. Using CFD and engineering heat transfer numerical analysis methods, the air flow vector diagr

　　Distinguishing point XNUMX: Observe the color and luster of the tire pattern From the perspective of the texture, in general, the grooves are relatively shallow due to the irregular processing of inferior retread tires.In terms of color, inferior retread tires look bright in color and shiny, while the regular ones are relatively dark. Identification point XNUMX: Observe the overlap between the tread and the sidewall First look at the sidewall, whether the various signs are complete, and each tire manufacturer has a forum pattern code mark to see if the pattern code corresponds to the tire pattern.Secondly, look at whether the joint between the tread and the carcass at the shoulders is smooth. The retreaded tires are all self-made treads that are attached to the old carcass. The overlap between the tread and the sidewalls is not as smooth and round as the new tires. There are bonding marks on the side. Distinguish point three: tire mark Brand tires pro

  No matter what kind of coating process is used for the surface quality of automobiles, the surface quality of the plastic parts of the car body must meet the requirements of Class A. Therefore, plastics must have good processing fluidity. In addition, in order to ensure the smallest possible gap size between parts under extreme temperature conditions, the thermal expansion coefficient of the body plastic parts must be small. If the body plastic part is used as the skin of the metal substrate, the quality of the appearance can only be guaranteed when the thermal expansion coefficient of the substrate and the surface layer are close. Generally, the coefficient of thermal expansion of thermoplastics is much larger than that of steel. Fillers are generally added to reduce the coefficient of thermal expansion. However, the addition of fillers tends to always reduce the surface quality. Fiber-reinforced thermosetting plastics can mostly meet the requirements of

The technicality, complexity and particularity of lubricating oil products fully reflect the necessity of lubricating oil technical service work, which is embodied in the following aspects: Lubricating oil is a product with high technical content, and its product development and application research involve petrochemicals and machinery. Professional and other multi-disciplinary fields, cross-professional, cross-industry proficiency in lubricant expertise is not easy; any mechanical design must carry out a reasonable lubrication design, and any application of any kind of oil has problems. However, the lubricating oil market is wide-ranging, with many types of user industries, and users are in a state of dissociation and dispersal. It is necessary to establish a large number of expert service teams; there are many varieties of lubricating oils, and the specifications and grades are complex. China has formulated lubricating oil classification standards with re

Caring for a car must pay attention to science. However, some problems often arise in car maintenance. Some people thought they were caring for the car, but in fact they accidentally damaged the car. Maintenance experts remind you that the following wrong maintenance method is equivalent to destroying the car. 1. Waxing in a circle The effect is poor. Many people habitually wax the car in a circle. This is an incorrect method. The correct way of waxing is in a straight line, alternating horizontal and vertical lines, and then in the direction of rainwater flow. In this way, the effect of reducing the concentric circular halo on the paint surface can be achieved. 2. Too much oil Failure When the oil in the engine oil pan is insufficient, the friction between the bearing and the journal will be due to the small amount of oil, poor lubrication, aggravating the degree of wear, and even causing a bush-burning shaft accident. However, if there is too much oil

  For users, even if safety, environmental pollution and energy saving are not considered, counterfeit and inferior auto parts are very troublesome. Counterfeit and inferior parts do not have strict production standards and perfect inspection and testing methods. There are many hidden quality problems, short service life, and the frequency of failures during use is quite high. Failures occur every three days, and minor repairs occur in a few days. Overhaul not only causes certain economic losses to users, but also annoying. The proliferation of counterfeit auto parts in the market is harmful to no benefit. It has caused huge economic losses and reputation losses to the national management departments, manufacturers, sellers and consumers, and seriously threatens the safety of people's lives and properties. In this case, counterfeit and inferior parts can make money by using other people’s brands and markets. With little input, high output, and small mo

  Porous media conditions: model parameter method of porous media for calculation. The numerical simulation result table lists the simulation data of the heat sink with the wave distance of the heat dissipation band. The radiator simulation data shows the numerical simulation results of the overall temperature field of the tube-belt radiator when the wave distance of the heat dissipation belt is at the water inlet flow rate and the air inlet speed. Result comparison and conclusion analysis The error comparison between the experimental data and the simulation results of the radiator with a wave distance of the heat sink The distance radiators have been processed as shown in the table. The numerical simulation results of the radiator are in good agreement with the wind tunnel test data, where the maximum error of the outlet water temperature is and the maximum error of the wind resistance is. The errors between the test data and the simulation results mainly

Many people who drive in winter often have this feeling: the battery that has just been fully charged will run out in a while. It feels like the electricity in the battery has been stolen, which is really a headache for many car owners. This is because the temperature in winter is low, and the capacity of the battery in a low temperature environment is much lower than that at room temperature. Therefore, in winter, it is extremely important to maintain the battery. Next, **car.com will introduce you to the maintenance of car batteries in winter. 　　Why is the battery dead? 　　There are still functions and components running after the vehicle is turned off 　　Many car owners think that after closing the switch, the car is in a state of power failure, but in fact, many devices are still in operation. *It is common that the anti-theft system installed on many car models nowadays, as soon as the car door is locked, the system starts to work, and its power consum

From the perspective of technological learning and innovation, the auto parts industry cluster has an atmosphere that encourages innovation, and this innovation can be quickly absorbed by other companies in the cluster through technology spillovers, which in turn leads to the emergence of new innovations. The reasons for this phenomenon can be understood from two aspects: On the one hand, because horizontal enterprises in the cluster produce similar or identical products, the differences between them are mainly due to quality and innovation. Faced with internal competition, they will inevitably drive them to continue. Innovation to achieve the purpose of differentiation. On the other hand, the vertical enterprises in the cluster, in order to meet the innovation needs of upstream or downstream enterprises, will inevitably continue to improve and innovate their own products. Moreover, innovation in these two cases is not an isolated behavior. Due to the existe

Standard model and parameters Model and name Maximum test value accuracy/% EHB-100A standard dynamometer 10000kg 0.3 SZG-141B digital speed 10000rmin-10.0222 self-inspection conditions Working temperature 1035, the environment is dry, clean, and vibration-free. The difference between the load display value of the self-checking equipment load and the actual force applied to the drum is the load error. (1) The installation of the EHB-100A standard dynamometer The standard dynamometer is fixed on the bracket, the dynamometer probe should be located on the plane composed of the rim and the center axis of the drum, and the end with the probe rests on the drum Up, the other end is towards the rim, as shown. (2) Load test Choose 5 force points for load test on each station. In accordance with our factory’s inspection requirements for finished tires, five force points of 1, 2, 3, 4 and 5t are selected at the 1 and 2 stations. The installation of the EHB-100A stand

In the application of micro-lubrication system, the generation of oil mist is very critical. There are many factors that affect the effect of MQL micro-lubrication. At present, most users do not have a clear understanding of the characteristics of oils used under micro-lubrication conditions. They think that as long as the oil can be used in micro-lubrication processing, this is a wrong understanding. It is very important to correctly select micro-lubricating products. First of all, mineral oil cannot be used in micro-lubrication processing, mainly because the oil mist particles produced by mineral oil are harmful to the human body, and the particle size generated by mineral oil atomization is large, the lubrication effect is not good, and mineral oil is not suitable for high-speed processing Lubrication in the state. When the micro-lubrication system is used in cutting, the oil is very important. First of all, the oil must be environmentally friendly and

Comparison of the axial stiffness The bearing capacity of the combined spring P=P1+P2=(Gd18c3n1+Gd28c3n2) F=134.94F The bearing capacity of the original cylindrical spring P=Gd28c3n2=93.3F The axial stiffness of the combined spring The axial stiffness of the original spring= 134.94F93.3F=1.446, so the axial stiffness is obviously improved. Comparison of lateral stiffness and bending stiffness The lateral stiffness of a single spring can be calculated by the following formula: Pr=Ed48nD32<1+43(HD2)2(2+L)>F The bending stiffness of a single spring can be calculated by the following formula: M=Ed416D2nH(2 +L) Fr is the combined spring axial stiffness. The original spring axial stiffness=d41D2n2H+d42D1n1Hd42D1n1H=1.225 This ratio shows that the improved combined spring has a greater increase in stiffness in all directions. Improvement of the secondary spring The secondary spring is located between the bogie and the carriage. After the locomotive speeds u

In the process of highway construction, a large number of construction machinery and construction machinery combinations are required. Due to the gradual deterioration of their technical conditions during use, the engine power decreases, fuel consumption increases, exhaust gas exceeds the standard, transmission component gaps increase, and operating mechanisms do not work well. An error occurs in the working device. This is mainly due to the wear of the parts, the structure of the parts, the processing quality of the materials, the working conditions (climate and construction environment), the quality of the fuel and lubricating materials, the reasonable degree of use, the operation methods in the construction, the configuration of the machinery, and technical maintenance Caused by repair quality, etc., we will analyze separately below. Wear and damage of construction machinery parts During the use of the machinery, wear occurs due to the friction between th

  The influence of combustion system parameters on engine performance. Fuel supply advance angle and fuel injection pressure test results show that the best fuel supply advance angle (CABTDC) of dimethyl ether during operation is: 19° under calibration conditions and 15° at low speed. This is 6°-9° smaller than the best fuel supply advance angle (25°) of diesel in operation; when the injection pressure of dimethyl ether is 15MPa (lower than the injection pressure of diesel 18MPa), the thermal efficiency is highest. This is because dimethyl ether has a higher cetane number, lower auto-ignition temperature and better atomization performance than diesel. Plunger Diameter The effects of three plungers with diameters of 8.5mm, 9.0mm and 9.5mm on the thermal efficiency of the engine were tested. The thermal efficiency η of the engine with different diameter plungers varies with the average effective pressure P. From this, it can be seen that the thermal efficienc

At present, domestic motor vehicle detection and management systems are divided into centralized control and distributed control according to the microcomputer control mode. The centralized control system uses a master control machine to complete the registration of motor vehicles and the inspection of various items across the line, without a station control machine. The analog quantity, switch quantity and pulse signal of each station on the detection line are transformed and isolated directly into the person and the host. Therefore, the entire system structure is relatively simple, easy to install, debug and maintain, and the system cost is low. The main disadvantage of the centralized control system is the heavy task of the host, that is, to log in to the vehicle to be inspected, and to monitor the inspection situation of each station, the operator is often easy to ignore the other. In addition, the detection line is generally relatively long (the entire l

  Auto parts marketing companies have special and complex inventory, but the inventory of each kind of parts is generally only a single digit. This is mainly because the merchants are willing to reasonably expand the variety of accessories with limited funds, the easier the sales will be. But such a library poses a problem, that is, these stocks are very small and may be out of stock at any time. But in fact, the different distribution time may be a few days or a few months. Therefore, how to grasp the law of sales and reasonably control the species and quantity; if the variety, quantity, method and timing of the purchase are the same according to the sales and inventory conditions. An important issue that the auto parts marketing industry has been studying. Computers are generally used to manage auto parts marketing companies. Computer management has been used to improve work efficiency, but has developed to a certain degree that its variety and diversifi