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Working principle of slow wire processing

 Slow wire walking, also called low-speed wire walking, is a kind of CNC machining machine tool that uses continuously moving fine metal wire as an electrode to pulse spark discharge on the workpiece to generate a high temperature of over 6000 degrees, ablate metal and cut into a workpiece. The principle of wire processing is the phenomenon that there is a gap between the wire electrode and the workpiece, and the metal is removed by continuous discharge. Since the slow-moving wire cutting machine adopts the method of wire electrode continuous feeding, that is, the wire electrode is processed during the movement, so even if the wire electrode is worn out, it can be continuously supplemented, so it can improve the machining accuracy of the parts and slow the wire. The surface roughness of the workpiece processed by the cutting machine can usually reach Ra=0.8μm and above, and the roundness error, linear error and dimensional error of the slow-moving wire cutting machine are much better t

Hydrostatic guideway of CNC machining lathe

The static pressure slide rail (TTW guide) of the CNC machining lathe transfers the oil with a certain pressure through the throttle to the oil cavity between the sliding surfaces of the slide rail (TTW guide) to form a pressure oil film to float the moving parts , Make the sliding rail (TTW guide) surface in a pure liquid friction state.   CNC machining General CNC machining usually refers to computer digital control precision machining, CNC machining lathe, CNC machining milling machine, CNC machining c17200   beryllium   copper   and milling machine, etc. The feed route of finishing is basically carried out along the part contour sequence. Therefore, the focus of determining the feed route is to determine the feed route of rough machining and idle stroke. In the numerical control processing, the control system issues instructions to make the tool perform various motions that meet the requirements, and the shape and size of the workpiece are expressed in the form of numbers and lette

Elimination of Gear Backlash in CNC Machining Feed System

Elimination of Gear Backlash in CNC Machining Feed System   The transmission gear in the feed system of the CNC machining machine tool must eliminate the transmission gap between the meshing gears as much as possible, otherwise the motion will lag behind the command signal after each reversal of the feed system, which will affect the machining accuracy (accuracy) ). There are the following two common methods for CNC machining machine tools to eliminate the transmission gear gap.   1. Rigidity adjustment method   The rigid adjustment method is an adjustment method that cannot be automatically compensated for the tooth side clearance after adjustment. Therefore, the pitch tolerance and tooth thickness of the gear must be strictly controlled, otherwise the flexibility of the transmission will be affected. This adjustment method has a relatively simple structure and a better transmission rigidity.   (1) Eccentric shaft adjustment method   As shown in Figure 610, the gear 1 is mounted on th

Analysis of Lubricant Used in Rolling Bearings

As we all know, bearing is a pivotal component in contemporary mechanical equipment. Its main function is to support the mechanical rotating body to reduce the friction coefficient of the mechanical load during the transmission of the equipment. Therefore, it is particularly important to choose a suitable lubricant. So, how should the rolling bearing lubricant be selected, and what are the methods?

The lubricants used in rolling bearings are divided into two types: grease and lubricating oil.

One, grease.

Grease is made by mixing lubricating oil, thickener and additives at high temperature. According to the type of thickener, grease can be divided into calcium-based grease, sodium-based grease, calcium-sodium-based grease, lithium-based grease, aluminum-based grease, and molybdenum disulfide grease.

The main performance indicators of grease are penetration, dropping point, mechanical stability, oxidation stability and corrosion resistance. The choice of grease should be based on the working conditions, temperature and load of the bearing.

Dropping point is generally used to evaluate the high-temperature performance of grease. The actual working temperature of the bearing should be 10-20℃ lower than the dripping point of the grease, and the use temperature of synthetic grease should be lower than 20-30℃. Penetration refers to the hardness or bearing capacity of the grease. Bearings that work under heavy loads should use grease with low penetration. Calcium-based grease is not easy to dissolve in water and is suitable for working environments with humid and high water content. Sodium-based grease is easily soluble in water and is suitable for dry and low-moisture working environments.

Generally, grease is often used in bearings. The advantages of lubricating grease are: high oil film strength; good grease adhesion, not easy to lose, and long use time; simple sealing, which can prevent dust, moisture and other debris from entering the bearing. The disadvantage is: when the speed is higher, the friction loss power is larger.

Insufficient or excessive grease will cause the temperature rise and wear of the bearing to increase during the operation of the bearing, so the filling amount of grease should be moderate. Generally, it is appropriate to fill 1/3 to 1/2 of the space between the bearing and the housing.

Two, lubricants.

lubricants include special mineral oil, vegetable oil and synthetic lubricants.

The performance indicators of lubricating oil include viscosity, viscosity-temperature characteristics, acid value, corrosiveness, flash point, freezing point, etc.

Viscosity: Refers to the frictional resistance of the relative movement of the lubricating oil. The viscosity directly affects the fluidity of the lubricating oil and the ability to form a lubricating oil film between the friction surfaces. Therefore, viscosity is an important basis for choosing lubricating oil.

Bearings working under high speed or high temperature conditions are generally lubricated by oil. The advantages of oil lubrication are: reliable lubrication, low friction coefficient, good cooling and cleaning effects, and a variety of lubrication methods can be used to adapt to different working conditions. The disadvantage is that it requires complicated sealing devices and oil supply equipment.

When the bearing is immersed in oil (oil valley lubrication), the height of the oil level should not exceed the center of the rolling element under *. When the speed is high, drip oil or oil mist lubrication should be used.

The automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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