2016.9.29 Songshan day tour

2016.9.29 Songshan day tour

Diamond magnetic susceptibility measurement is to measure the magnetization of the diamond sample. Diamond is composed of carbon atoms, pure diamond should not sense the magnetic, since the diamond used for the synthesis of metal as catalyst, a synthetic diamond interior containing various amounts of metal impurities, especially the inclusion within the crystal resulting diamond has a magnetism, and therefore , synthetic diamond magnetic size, not only its internal impurities and inclusions content component has a direct relationship, but also with its physical and chemical properties and quality indicators (such as toughness, strength, specific gravity, thermal stability, color, transparency, etc.) there is a close relationship. By measuring the magnetic susceptibility of this simple way of non-destructive testing, characterization of the nature of the impurities in synthetic diamond, toughness, strength, thermal stability, etc., has important practical value. Generally the lower the susceptibility of the diamond, the less impurities in diamond, the toughness better, better transparency, and wear properties of diamond tools is better. Some large foreign companies have internal susceptibility tests as an indicator to control the quality of diamond.

Vibration is the enemy of dressing

In the wheel dressing, and effectively reduce vibration and avoid dressing in grinding wheel surface leaving traces of collision and damage repair tools, it is essential. This means that you must also maintain a balance wheel, which is the wheel itself, the structural characteristics of the decision. Density unevenness and the entire wheel geometry is good or bad, will affect the natural balance of a wheel. So choose a high-quality grinding wheel is also very important. If it is a high quality grinding wheel, just proper installation that is able to maintain a good balance wheel. Grinding wheel according to the manufacturer's instructions factory, are marked with an arrow up on the wheel, it shows the balance wheel after crude light end position. The user can then noted in the arrow directions, wheel dressing attention to dynamic equilibrium. Coolant uniformly filling, and sometimes can also help maintain a balance wheel.

In order to prevent vibrations as much as possible, the operator must make the dressing tool clamped in strong clip seat and leave the minimum amount of overhang, the only way to make the dressing tool strong enough rigidity. If diamond tools are not firmly clamped in the finishing process, it will inevitably cause vibration, resulting in severe noise, the surface of the part produce small ripples, resulting in parts of the surface strain on the dresser and cause some damage.

Keep them cool

Proper use of coolant, can speed up the repair and improve the efficiency of trimming. According to experience, a 3/8 of an inch of the diameter of the cooling fluid, can eliminate a lot of heat from the dresser, prolong the service life of the dresser. When diamond dressing tools by grinding wheel, install a cooling fluid nozzle, full of the grinding wheel surface or constantly refill coolant to diamond dressing tools. After the dressing tool and start dressing grinding wheel contact, never allow dressing tools, exit from the cooling fluid. Otherwise it will make diamond dressing tools, under the extreme temperature of cold and hot, crack or break.

Use filters to high precision filter, coolant can avoid dirt or chip in the cooling liquid cycle for many times. Contaminated coolant can make grinding wheel wear quickly, to increase the number of grinding wheel dressing. Only when dry grinding (only in this case, can interrupt cooling) for diamond dressing tools, grinding wheel to take dry finish. In every day before coming off work, after turn off the cooling fluid, let the grinding wheel idle for a few minutes. This will prevent broken wheel. 

The balance of grinding wheel

The replacing of Grinding Wheels

Advances in resin grinding wheel processing

In the current gear grinding, still in use by ordinary abrasive. But the standard abrasive and aluminum oxide ceramic product productivity has been greatly improved. Sintered ceramic and single crystal aluminum oxide, synthetic binder, and the development of new grinding technology, this progress has contributed.

In the last 10 years, more and more people use powerful creep feed grinding mode processing involute. Compared with the hitherto conventional reciprocating grinding, grinding wheel contact area is much greater, therefore, the use of the wheel must be able to withstand high pressures. Only when subjected to a sufficiently high pressure on a single abrasive grit it may become a pointed.

use of the wheel balancer in grinding wheel production process

Analysis Principle Of Diamond Wheel

Diamond Wheel is a new rise of grinding tools, diamond grinding wheels with high hardness, high compressive strength, wear resistance and good in grinding has become grinding hard and brittle materials and ideal tool Carbide, not only high efficiency, high precision, and roughness, less grinding consumption, long service life, but can also improve working conditions.

Diamond Wheel diamond abrasive is based on raw materials, respectively, using a metal powder, resin powder, ceramic and metal plating, etc. as a binder to form a circular central through hole becomes abrasive diamond wheel, let's take a look together it works:

Diamond grinding wheel for glass, ceramics, ferrite, semiconductor materials, hard and brittle materials and metal materials of grinding, electrolytic grinding, carbide materials contouring, machining centers and grinding with a diamond drill grinding heavy-duty cutting, grinding having good wear resistance, high efficiency, long life characteristics.

With the rapid development of high-speed grinding technology of ultra-precision grinding, grinding wheel put a higher demand, ceramic resin bonded grinding wheel has been unable to meet production needs.

Diamond wheel for its combination of high strength and good formability, long life and other significant characteristics and production has been widely used.

A sharp is a transferred superhard abrasive grinding wheel grinding grain of sharp grinding process. In this process, need to remove the grinding grain between binder and blunt grinding wheel grinding grain, make strong grinding performance of the grinding wheel grinding grain of prominent binder, form a sharp cutting edge. Repair the sharpness must also from the pores on the surface of the grinding wheel, remove tiny material, prevent enlargement of the grinding force acting on the grinding wheel, grinding wheel on the grinding force increases, will cause vibration and cause parts surface burn.

Without the proper repair sharp, even the best grinding wheel is not likely to get consistency processing parts with high quality and size. In fact, when you invest in the high quality of the grinding wheel, in order to obtain high grinding performance, good finishing them it is very important.

Plastic can be said to be part of preparations for grinding wheel, it with ordinary grinding wheel repair sharp at the same time. Two process for superhard abrasive grinding wheel, is separately, first for plastic wheel. In the use of superhard abrasive grinding wheel grinding, plastic surgery is the use of plastic tools or roller, repair the sharpness is often using a trim stick, ceramic bond upon the completion of the plastic, for dealing with sharp grinding wheel.

Before dressing of grinding wheel's including plastic and sharp, guarantee the spindle bearings in a certain temperature, such as common grinding wheel grinding state) is very important. This can avoid damage parts geometric shapes and abnormal wear of grinding wheel and the dressing tools. For dressing tools must be handled with care, generally speaking, qualitative hard, wear-resisting, but because it is very brittle materials, diamond and the tiny crack and breakage caused by slight collision, force is very sensitive.

Because the diamond dresser itself is a tool, need to keep very sharp. Use a dulling the dressing tools to trim surface of grinding wheel, grinding wheel dull. In order to maintain a high quality and the sharp diamond dressing tools, at regular intervals, twirling need 1/8 single point or finishing tool with a cone tip. Number of revolution can be decided according to the modification situation, according to the experience, at least rotating once a day. For chisel head and forming the dressing tools, general need 180 ° before they dull rolling again.

Most of the cylindrical grinder is put parts and grinding wheel in a horizontal line. The highest point of the cylindrical parts with cylindrical grinding wheel/grinding wheel contact points, the highest known as parts diamond dressing tools should be as much as possible in the near parts/grinding wheel dressing grinding wheel contact points. For internal grinding machine used grinding wheel, diamond dressing tools close to the highest point of the cylindrical grinding wheel (that is, the hole when the parts/grinding wheel contact point) to nap, it is more important. 

4 do grinding and safety protection Grinding machine safety protection device is mainly grinding wheel cover. In addition, when grinding and finishing, also should pay attention to prevent wear debris and broken grains of sand and grinding fluid and the formation of the splash water mist diffuses, lest affect the operator's health and cause environmental pollution. Once broken, grinding wheel cover can prevent the wheel debris from equipment and personal injuries caused by flying. Practice shows that reasonable design of the grinding wheel shield can completely block grinding wheel debris flew out, so as to effectively protect the operator and equipment safety, but also have the operator safety protection should be implemented in a row. For example, recently in some branch of double end face grinding wheel broken incident is very alarming, double process operators for dressing grinding wheel is convenient, the grinding wheel on the shield cover of eight fastening screw unexpectedly didn't screw in, the result when a grinding wheel (7 5 6 0 0 * * 50 a 80 K B) suddenly broken occurs, the lid on the wheel guard bursts with 3 m, how far nearly caused the tragedy of death. So when grinding safety more require the operator to have a high level of security awareness and compliance protective consciousness. In short, as long as you can from the above several aspects of the analysis, the methods and measures of implementing the content of the safety requirements, accumulate over a long period of summary analysis, and constantly improve and supplement, we will greatly reduce the events of the grinding wheel broken, will be sufficient to protect the operator's personal safety and property safety of the factory. Above is some experience of the author, in line with the purpose of the study with everybody together, have access to, please refer to our national standard.&nbsp

How to repair resin grinding wheel end surface

Resin wheel, mainly referring to the grindstone binder resin. The same resin grinding wheel, but due to different abrasive trimming mode adopted is not the same. Today we'll introduce three resin grinding wheel:

First, the type of abrasive corundum, and this wheel is usually not needed trimming, by self-sharpening wheel to fall off the sand, ongoing appropriate compensation it. That is up to the new wheel in the beginning, in order to balance a simple tidy up.

Second, diamond abrasives, such grinding wheel dressing wheel dressing pen can not use, but to rely on a little soft, sticky bigger things to be trimmed, for example, A3. Iron, stone and so on.

Third, CBN abrasives, which can refer to the second wheel dressing wheel dressing mode.

Name but a few examples of the most common wheel breakage

Cause wheel breakage of a variety, because the use of diamond grinding wheel, according to different industries, different processing methods and different grinders have many different characteristics. Here we report some of the most common questions to explain.

Since the wheel cracks caused rupture, diamond grinding wheel shaft hole is large or small, were mismatched load caused by rupture of the wheel, the solution is to find a small hole or shaft to be able to smoothly load a suitable model.

In addition, the use of the side flange will also cause wheel breakage, diamond grinding wheel flange is identical on both sides of the desired size, and uniformly tightened. This is the most effective method of confrontation.

If the flange uneven support, such as: flanges bent; lead grout layer protruding; flange burr; diamond wheel uneven. Effective solution is to the left and right sides of the flange to be finished to the correct specified size and smooth, diamond wheel flat part to be processed accurately, and can not lead grout layer plane protruding.

Requirements of Pneumatic grinders using

1, staff must wear a dust mask.
2, the use of grinding wheel workpiece, first start until normal idle, and then by the light and heavy get confide in prison, so that the force evenly. But the pressure can not be too large or bump violently, so as not to hurt broken wheel.
3, the workpiece when grinding wheel rotational direction on both sides allowed to stand, so as not to fire into the sand splashing wounding.
4, after the work is completed, close valves, the grinder placed into a dry safe place. So as not to damp wheel, then burst wounding.
5, pneumatic tools automatic shut-off valves should be kept intact to ensure that at the time of operation, only forced to start start to work.
6, pneumatic tools should be someone responsible for inspection, storage, regular maintenance.
7, prohibits casually start grinding wheel or something else beat impact wheel, when changing the wheel, check the wheel for cracks to pad level folder in prison.
8, not allowed to use unqualified wheel.
9, clean up, clean up with a brush to stop.