Analysis and prevention of ferrule grinding burn
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Analysis and prevention of ferrule grinding burn

Source: Bearing network time: 2014-04-12
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1. The mechanism of burn attack is that the bearing ring is in the grinding process; because of the cutting, scribing and conflicting effect of the abrasive grains on the workpiece; the plastic appearance of the metal is plastically deformed; the internal displacement of the metal molecules in the workpiece is internally conflicted and the heat is generated, and the grinding wheel is cut; The speed associated with the workpiece is very high; it has a strong external conflict with the appearance of the workpiece and heats up; and because the cutting of each abrasive is 霎; its heat generation is also in the 霎 time; it cannot be transmitted in time; so in the grinding area The instantaneous temperature is higher; usually it can reach 800~1500°C; if the heat dissipation method is not good; it is very simple to form the burn of the external appearance of the workpiece; that is, the secondary quenching and high temperature return on the surface layer of the workpiece (usually several tens of micrometers to beat the micron) Fire; destroyed the arrangement of the workpiece; the naked eye can see severe burns. The appearance of the appearance of severe yellow or black oxide film; the fine burns should be observed with a dilute acidic solution to etch; the burn is black. Burns will reduce the life of the workpiece.
2. Preventing burns because burns are caused by a lot of heat in the grinding area and are not formed in time; therefore, it is necessary to prevent the onset of heat from burning; to accelerate the release of heat; that is, to reduce the internal and external conflicts during grinding; And the workpiece is provided with sufficient and useful cooling. For the coolant, the composition concentration should be suitable; the flow rate and pressure should be sufficient; it can effectively eliminate the collision (washing the grinding wheel and the workpiece conflict; cooling and smoothing).
Reduce the onset of conflict heat; after all, it is necessary to reduce the internal and external conflicts during grinding; this should be summarized into the following aspects: reducing the thickness of the grinding; reducing the plastic deformation of the metal.龋岣吖ぜ伲 龋岣吖ぜ伲 龋岣吖ぜ伲 ハ髑虻氖 ハ髑虻氖 ハ髑虻氖 ハ髑虻氖 ハ髑虻氖 渌醵蹋豢 渌醵蹋豢 跎倌ハ 跎倌ハ 跎倌ハ 跎倌ハ 跎倌ハ 刍 由 由 由 由 由 由 由 由 由 由 由 由 由 由 由 由 由 由Sugisui (4) 龋 チ チ チ チ 豢 豢 豢 豢 蛔橹 蛔橹 蛔橹 蛔橹 蛔橹 芴 芴 芴 チ チ チ チ チ チ 湮 湮 湮 湮 湮 湮 湮 湮 湮 湮 湮 湮 湮 湮 湮 湮 湮 湮 湮 湮 湮 湮 埽徊 埽徊 埽徊肷 值 值 值 ぜ砻媲 ぜ砻媲 ぜ砻媲 ぜ砻媲 ぜ砻媲 ぜ砻媲 ぜ砻媲 ぜ砻媲 ぜ砻媲 ぜ砻媲 ぜ砻媲 ぜ砻媲 ぜ砻媲 ぜ砻媲 ぜ砻媲 ぜ砻媲 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而 因而Larger grinding thickness, harder in final grinding; smaller grinding wheel; guaranteed use of dressing wheel; and smaller grinding thickness, high grinding strength, high hardness and poor thermal conductivity Easy to use a small feed; improve the workpiece speed; can be useful to prevent burns.
3. Burned varieties have the following detailed elements to form burns in practice:
.1) Process system oscillation, machine tool oscillation and hydraulic system pressure are unstable. When the oscillation is 霎, the grinding amount will be increased; the burn will be formed; at this moment, the burn will be scattered along the surface of the workpiece; also called vibrating burn.
.2) The grinding wheel is poorly trimmed, so that the abrasive is not sharp; the burn is formed; at this moment, the burn is scattered along the grinding wheel; also called scratch burn.
.3) Lack of suction on the centerless clamp or loose support; the workpiece will slip when it occurs; it will cause burns.
.4) uneven grinding amount; inconsistent grinding thickness; partial burns will occur.
.5) The grinding wheel is too hard; if the feed rate is too large and the workpiece rotation speed is too high (the workpiece speed is too high, the cutting ability of the grinding wheel will be lowered), the workpiece will be uniformly burned.
1 Planar grinding plane process, such as grinding the plane on a vertical single-head grinding machine; in the case of correctly fulfilling the operating standards; there are several factors that can cause burns.
a. The grinding wheel shaft is swayed; when the boring increases, the grinding amount causes burns. At this moment, it is necessary to tighten the wheel axle bearing or replace the bearing.
b. The disk of the workbench jumps or the rotation speed is not uniform; when the grinding amount is increased, the amount of grinding causes burns, and various components of the disk reducer, such as a worm gear, a worm, etc., need to be repaired, and the wear parts are replaced.
c. The magnetic force of the disk is small or broken; this will cause the workpiece to slip on the disk, causing burns and overhaul; the charging and demagnetizing lines should be adjusted.
d. The reciprocating stroke is not well positioned; if the stroke switch is not well touched or the reciprocating reducer assembly is worn; the worm gear and the worm tissue cannot be self-locking; the slamming, impacting and beating will cause burns in the carriage. After the double-face surface grinder such as M7675 series The following causes of the grinding machine will form a burn:
●The feeding guide is worn; it is not straight; the feeding is uneven,
● The guide plate is not parallel to the working surface of the grinding wheel.
●The entrance of the grinding wheel end face is too small, so that the outer edge of the grinding wheel bears most of the cutting amount, and the grinding wheel becomes dull.
2 Cylindrical grinding of centerless cylindrical grinding machines such as M1083; usually have the following special conditions:
●Infeeding the plate, punching, and increasing the amount of the tool, causing burns. It is necessary to adjust the wedge iron, remove the smooth plate or scrape the guide plate, overhaul the lead screw, and the silk nut; replace the wear parts.
●The spark is not adjusted properly; too much grinding at the entrance; the front end is easy to burn; if the grinding is too much at the exit, the workpiece has a spiral mark.
● The feed amount is too large or the electrical components are badly touched; the thermal relay will trip in the workpiece; and the active stop will be stopped; at this moment, the knife should be quickly retracted.
3 The inner diameter grinding process has a long touch arc between the grinding wheel and the workpiece during grinding; the heat of the attack is more, the coolant is not easy to hit the grinding area, the heat dissipation condition is poor, the wedge is difficult; the plug is easy to plug; these are The reason for the formation of high temperature for grinding; therefore, the coolant needs to be sufficient and useful; the grinding wheel should be repaired in time. Like the MZ208 series internal grinding machine; the grinding wheel must be repaired to compensate the organization; or it will be repaired due to the grinding surface. Because such machine tool compensation organization is done by roller friction transmission; there is no guarantee that the same compensation will be obtained every time; the current situation is to change the organization from roller friction to stepper motor organization.
4-channel grinding on the oscillating head; its grinding wheel is more self-sharpening; usually with a rubber bond grinding wheel; because at the high temperature of the grinding area; the rubber bond is easy to age and become brittle; the blunt abrasive grains are swaying It is easy to fall; therefore; the grinding wheel should always be sharp. For the cutting and grinding; its grinding wheel adheres to the shape of the function; it usually uses a harder grinding wheel; its self-sharpness is poor; so it is often useful to trim; The coolant should be abundant. It is the most likely process to cause burns; the cooling is particularly important, otherwise the rotation speed of the grinding wheel is different; the wear of the grinding wheel is uneven; the dressing is required to be good; the rotation speed of the corrector Uniform, stable, and compensated organization should be firm; the diamond should be sharp; the tip of the pen should be 1~2mm lower than the middle of the grinding wheel; otherwise it will easily cause oscillation during trimming; affecting the trimming effect.
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