How to better pay attention to six taboos on car maintenance
Used to remove material from internal cylindrical surfaces to improve part geometry or produce a finer surface finish, honing is performed at a much slower speed than is typically used in Precision Grinding.
The cutting action is achieved by a rotating hone, or stone, which is bonded with a very fine abrasive grit and mounted on a metal mandrel. Rather than being clamped in place, the workpiece is fixed to allow floating and prevent distortion that would result in an oval rather than round hole.
The hone is rotated in a controlled path over the surface of the part. In some cases, a machinist might move the workpiece back and forth over the rotating hone, ensuring that the part is floating rather than being pressed against the hone - again, to avoid an oval hole.
With a horizontal honing machine, the workpiece may be held in a self-aligning fixture while the machine controls the speed and length of the stroke. The hone is hydraulically or mechanically expanded until the desired hole diameter is achieved.
In addition, a cutting fluid must be used. The purpose is threefold: to clean small chips from the work area, to cool the workpiece and hone, and to lubricate the cutting action.
Lapping is used to achieve surfaces that are very flat and smooth, as well as to finish round work, such as precision plug gages, to very tight tolerances.
The lapping process is more gentle than honing and removes much less surface material. Therefore, the workpiece should be as close as possible to final size - achieved, for example, through double-disk grinding - because lapping typically removes only 0.0005" to 0.005" (0.0127 mm to 0.127 mm) of material.
Unlike honing, lapping uses fine-grained, loose abrasive particles suspended in a viscous or liquid base rather than a bonded abrasive stick or stone. The lapping process involves passing the workpiece between one or two large, very flat lap plates along with the abrasive suspension.
With lapping, close attention is paid to controlling every detail. This includes the speed of the plate(s), the pressure on the workpiece, the size and type of abrasive used, the feeding method, and the plate temperature.
Internal Grinding,Honing Machine Parts,Honing The Inner Hole,Honing Cylinder Liner Dayue Precision Technology (Dongguan) Co., Ltd. , https://www.dayuechn.com
How can we better repair and maintain the car? There are six points to pay attention to, to introduce you today.
1, avoid mechanical damage.
When carrying out maintenance operations, clear operating signs should be set to prevent other people from being mishandled and harmed. When starting the car, pay attention to the gear position of the transmission to prevent accidental injury. When working under the bonnet, let other people leave the cab to prevent the engine from turning abruptly or other people operating the mechanism and causing accidental injury. If you need to work under the car, you should set up a clear sign and cover up the car. When jacks are used, the jacks should be placed smoothly. Cars should be prepared before driving, and bricks and other fragile objects are prohibited. When installing the assembly, do not test the screw holes, keyholes, etc. by hand to avoid rolling off fingers. When testing the engine, you must not work under the car.
2, avoid fire.
When maintaining a car, it is often necessary to use flammable and explosive materials such as oil and cleaning agents. Don't forget the fire protection measures at this time, and prepare a fire extinguisher just in case. Do not smoke near fuel tanks and accumulators, as combustible gas escaping from the tank and hydrogen escaping from the battery are easily ignited.
3, avoid burns.
In engines that have just turned off, due to the relatively high temperatures of the various parts of the engine (water tanks, exhaust pipes, power steering fluid tanks, spark plugs, etc.), care must be taken to prevent burns. If the engine temperature is high, do not remove the water tank cover or loose open water switch to prevent burns.
4, avoid damage to the car.
The brake fluid has a damaging effect on the paint film of the car. It can quickly dissolve the paint film.
5, avoid paying attention to rotating parts and car road test protection.
When the engine is running, note that hands, clothing, and tools must leave the rotating fan and fan belts. During the trial run, the condition of various parts of the car should ensure safe stopping and steering. Road test cars must have obvious test marks. During the trial run, personnel must be safe and on a dedicated test track.
6, avoid not pay attention to the cleaning of the workplace.
When closing the engine cover or other assembly cover, check whether the items such as tools, rags, and removed parts are forgotten and wait until they are confirmed.
Honing Process
Lapping Process