Blog #China long life grinding wheel

Everything is constantly evolving, even human beings are no exception, let alone other equipment or instruments, tools, resin grinding wheel is an important grinding and cutting tool in the manufacturing industry, of course, is also developed step by step. Today I want to talk about how the automatic molding technology of China long life grinding wheel developed.

As early as the early 80s of the last century, people in the industry explored and tried this technology. At that time, China imported an automatic molding press from abroad. This machine is quite compact in design. It differs from ordinary press only by adding a feed system.

Its working principle is: put the mixture into the hopper above, through vibration, fall on the conveyor belt, scrape flat, and then adjust the speed of transmission, eventually the material will be sent to the weighing hopper, weighing accurately and then put the material into the cavity.

The design principle seems to be effective in improving production efficiency. But there is a practical problem: no matter how to adjust, it always fails to achieve the ideal level of design. Because the slice China long life grinding wheel feeding is not like smelting corundum, silicon carbide, the raw material error cannot be too large, through conveyor belt feeding, to weigh accurately is not an easy thing, repeated adjustments, not only can not improve efficiency but waste a lot of time. Now we use a compromise method, bypassing the more difficult feed system, artificial feed, using a multi-station press, labor intensity is reduced, production efficiency can also be guaranteed.

The ideal feed system needs to be improved and developed. Once mastered, this technology will enable the production of thin-section China long life grinding wheels, like the production of coated abrasives, to be efficient, fast, fully mechanized and automated, bringing tremendous changes to the thin-section market.

Characteristics of grinding wheel grinding

The China long life grinding wheel used for grinding is composed of abrasive grains, binding agents and blowholes. If Pa, Pb and Pp are used to represent the percentage of abrasive grain, binder and pore volume to the volume of the grinding wheel respectively, then:

When making China long life grinding wheels, adjusting the percentage of abrasive particles, binders and pore volume, different performance grinding wheels will be obtained.

The growth mechanism of abrasive grains used in making grinding wheels is different, and the breaking methods are different, and the shape of abrasive grains is very unusual. In addition, the position distribution of abrasive grains in China long life grinding wheel is random due to the structure and manufacturing process of the grinding wheel. Therefore, compared with other machining methods, grinding has many unique characteristics.

Choosing reasonable grinding parameters

Taking the UWIE21 2 CNC tool grinder (15kW) of SAACKE Corporation of Germany as an example, the linear velocity of diamond China long life grinding wheel in grooving process (grooving) is 14~20m/s, the axial feed speed is 50~200mm/min, the radial feed is 210~510mm, and the fine grinding is 0.2 mm.

The linear speed of diamond long life grinding wheel is 14-24 m/s, the axial feed speed of machine tool is 100-400 m/min, the radial feed of machine tool is 0.3-1.0 mm, and the precision grinding is 0.05-0.1 mm. When grinding the front and rear surfaces, no feed return light grinding is used to improve the surface roughness. If imported grinding wheels are selected, it is allowed to choose higher linear speed and larger radial feed than domestic grinding wheel for stainless steels.

Do you know the density of abrasive wheels?

Abrasive concentration is different when grinding wheel production, different concentration of the finished product characteristics are different, China grinding wheel suppliers today take you to understand the concentration of grinding wheel, I hope it will be helpful to you.

Abrasive concentration is defined in powder compacted sintered or resin bonded grinding wheel sheets as containing 4.4 carats per cubic centimeter of volume. The thickness of the thin fast working grinding wheel is generally between 75-150.

Diamond grinding wheels use 50% - 100% concentration; most of them use 75%, which requires a higher smoothness can be lower than 75%. Forming grinding and longer service life requirements of the grinding wheel, can be used 100% or more;

The concentration of 25% - 150% is used in diamond products, of which the coarse-grained cutting saw blade and the concentration are generally lower, i.e. 25-50%, and the fine-grained one is higher; while the concentration of other metal bond grinding wheels is generally required to be 50% - 100%. Generally speaking, the concentration of coarse grinding is higher, that of semi-fine grinding is medium, and that of fine grinding and polishing is higher.

The China long life grinding wheel density is too low, cutting efficiency is not high, concentration is too high, grinding wheel strength is poor and grinding wheel consumption is large. So in production, we should pay attention to the concentration of the control, to ensure the quality of the grinding wheel.

Deformation of resin cutting abrasive wheels

The deformation of resin grinding wheel is a difficult problem that has puzzled the China grinding wheel suppliers of resin China long life grinding wheel for a long time. The root cause of deformation is the uneven microstructure in the effective area of the wheel, which leads to the uneven stress in the hardening process of the product.

Manufacturers of resin-bonded China long life grinding wheels should concentrate on solving the problems of mixture uniformity, molding uniformity and mesh stability. Only by gradually solving the above three problems can the deformation of resin-bonded grinding wheels (mainly cutting wheels) be solved.

Application field of grinding wheel

In general, peeling grinding is mainly applied in the following two areas:

(1) Replacing the traditional shaping cut-in grinding: CBN grinding wheels do not need to change grinding wheels and dressing tools frequently when processing different workpieces, which reduces grinding settings and adjustment time and improves processing flexibility; at the same time, the contact area between the fast working grinding wheel and the workpiece is smaller when peeling grinding (Fig. 3), so the required grinding force is also greater. Small, avoid grinding vibration and workpiece deformation due to excessive grinding force, and improve machining accuracy.

(2) Substitute for hard turning or as the follow-up process of hard turning: The use of CBN wheels for peeling grinding can improve the dimensional accuracy and surface processing quality of the workpiece.