2.CBN grinding wheel in the hole in the application　Internal grinding efficiency

has been very low, the main reason is the grinding speed, grinding wheel

material and the rigidity of the problem.Production process used in dressing

wheel, grinding wheel replacement time accounted for almost a single piece of

work time1/3 to 1/5.If the inner or groove grinding using CBN electroplated

grinding wheel, and the wheel speed, increasing the diameter of the grinding

rod,can be properly increased workpiece speed and feed rate, not only can 

guarantee the hole (arc) diameter, groove width size and shape Bit accuracy,

surface roughness and avoid burns, but also can be doubled to improve processing

 efficiency and reduce processing costs.Such as a domestic factory processing

an annual output of 600,000 textile machinery rolling bearing sets, grinding

φ15.5 +0.04 the hole and the adjacent arc groove, in the past with chrome

corundum (GG) wheel, need to use two processes in two M224 internal grinding

machine, the slot (arc) diameter difference and the size and hole concentricity

is difficult to ensure, and low efficiency, the use of CBN wheel, the coarse

grinding rod, increased feed, saving trim And then changed to hole, groove at the

 same time grinding, that is, in the grinding rod installed two grinding wheel,

 so that the grinding efficiency increased by 1 times, saving a grinding

machine.The surface roughness of the workpiece is Ra0.63μm. The grinding process
parameters are as follows: υ = 36m / s, υ2 = 19m / min, f = 1μm / r, f = 

0.5μm / r,Time t = bs, with 10% concentration of the emulsion value.

Precautions for using of grinding wheel

1, start the wheel must be 4060 seconds after the stability of speed grinding, grinding tools should stand on the side of the wheel, not on the wheel to prevent grinding wheel broken broken flying out of wounding.

2, the same piece of grinding wheel, the prohibition of two people at the same time, not allowed in the grinding wheel side grinding, grinding, the operator should stand on the side of the wheel, do not stand in front of the wheel to prevent grinding wheel crack, Occurrence of accidents, while not allowed to wear gloves operation, prohibited around the reactor operation and in the grinding laugh and slapstick.

3, grinding the standing position should be in an angle with the wheel, and the contact pressure should be uniform, non-impact grinding wheel, so as not to fragment, the grinding wheel is limited to grinding tools, not grinding heavy materials or thin iron plate and soft materials Aluminum, copper, etc.) and wood products.

4, grinding edge, the operator should stand on the side of the wheel or inclined side position, do not stand on the front wheel, while the tool should be slightly higher than the wheel center position. Not too much force to prevent slippage injury hand.

5, the wheel is not allowed to touch the water, we should always keep dry to prevent water loss after the balance, an accident.

6, does not allow grinding wheel in the larger long objects, to prevent the shattered grinding wheel flying wounding.

7, not a single hand holding the workpiece for grinding, to prevent falling off in the protective cover card broken wheel.

Electroplating diamond wheel Advantages:

① electroplating process is simple, less investment, easy to manufacture;

② no need to repair, easy to use;

③ single-layer structure determines that it can reach a high working speed, now abroad has been as high as 250 ~ 300m / s;

④ Although only a single layer of diamond, but still have enough life;

⑤ high precision wheel for the wheel, the only plating manufacturing methods.Electroplated diamond grinding wheelElectroplated diamond grinding wheelBecause of these advantages, electroplating wheel high-speed, ultra-high-speed grinding occupy the undisputed dominant position.

 Electroplating diamond wheel defects: the coating metal and the substrate and the abrasive surface does not exist on the combination of solid chemical metallurgy, abrasive in fact only mechanical embedded embedded plating metal, which control force is small, heavy diamond particles, high efficiency grinding easy to fall off (Or the coating into a flake) resulting in the overall failure; to increase the holding force on the coating thickness must be increased, the result of abrasive particles exposed to a high degree of space debris, grinding wheel prone to blockage, poor heat dissipation, the workpiece surface prone to burns. At present, the domestic electroplating wheel manufacturing has not yet been optimized according to the processing requirements of the optimal design of the grinding wheel topography, single-layer electroplating diamond wheel of these inherent disadvantages will inevitably greatly limit its efficient grinding applications.

Electroplating diamond wheel Advantages:① electroplating process is simple, less investment, easy to manufacture;② no need to repair, easy to use;③ single-layer structure determines that it can reach a high working speed, now abroad has been as high as 250 ~ 300m / s; ">④ Although only a single layer of diamond, but still have enough life;⑤ high precision wheel for the wheel, the only plating manufacturing methods.Electroplated diamond grinding wheelElectroplated diamond grinding wheelBecause of these advantages, electroplating wheel high-speed, ultra-high-speed grinding occupy the undisputed dominant position. Electroplating diamond wheel defects: the coating metal and the substrate and the abrasive surface does not exist on the combination of solid chemical metallurgy, abrasive in fact only mechanical embedded embedded plating metal, which control force is small, heavy diamond particles, high efficiency grinding easy to fall off (Or the coating into a flake) resulting in the overall failure; to increase the holding force on the coating thickness must be increased, the result of abrasive particles exposed to a high degree of space debris, grinding wheel prone to blockage, poor heat dissipation, the workpiece surface prone to burns. At present, the domestic electroplating wheel manufacturing has not yet been optimized according to the processing requirements of the optimal design of the grinding wheel topography, single-layer electroplating diamond wheel of these inherent disadvantages will inevitably greatly limit its efficient grinding applications.

Electroplating diamond wheel Advantages:① electroplating process is simple, less investment, easy to manufacture;② no need to repair, easy to use;③ single-layer structure determines that it can reach a high working speed, now abroad has been as high as 250 ~ 300m / s; ">④ Although only a single layer of diamond, but still have enough life;⑤ high precision wheel for the wheel, the only plating manufacturing methods.Electroplated diamond grinding wheelElectroplated diamond grinding wheelBecause of these advantages, electroplating wheel high-speed, ultra-high-speed grinding occupy the undisputed dominant position. Electroplating diamond wheel defects: the coating metal and the substrate and the abrasive surface does not exist on the combination of solid chemical metallurgy, abrasive in fact only mechanical embedded embedded plating metal, which control force is small, heavy diamond particles, high efficiency grinding easy to fall off (Or the coating into a flake) resulting in the overall failure; to increase the holding force on the coating thickness must be increased, the result of abrasive particles exposed to a high degree of space debris, grinding wheel prone to blockage, poor heat dissipation, the workpiece surface prone to burns. At present, the domestic electroplating wheel manufacturing has not yet been optimized according to the processing requirements of the optimal design of the grinding wheel topography, single-layer electroplating diamond wheel of these inherent disadvantages will inevitably greatly limit its efficient grinding applications.

Grinding Wheel Introduction

Grinding Wheel consists of three parts: abrasive, binder (binder), pore

1, abrasive: grinding wheel is the main grinding part, with sharp edges and corners, that is, a small cutting edge to cut the workpiece, the abrasive is often a very hard material, usually compounds, such as silicon carbide (chemical composition is silicon carbide) , Corundum (chemical composition is aluminum oxide), diamond, the most common is the emery wheel and corundum wheel.

 

2, Binder: According to different use of the wheel are ceramic, resin, rubber, metal, etc., its main role is to bond abrasive together to form a certain shape of the wheel.

3, Porosity: Porosity is also a major part of the wheel, the purpose of the pores is to reduce the bonding strength of the binder, storage grinding grinding down the steel scrap, when a small part of the sharp abrasive abrasive, it will lead to the combination of pores The intensity decreased and peeling, exposing new sharp abrasive, conducive to further grinding.

The basic knowledge of diamond grinding wheelDiamond abrasive as raw material, respectively, with metal powder, resin powder, ceramic and electroplating metal as a binding agent, made of a circular hole in the center of the consolidated diamond grinding wheel known as.Their subjectsMechanical Engineering (a subject);Abrasives (two subjects);Grinding wheel (three subjects)structureDiamond wheel structure generally by the working layer, matrix, the transition layer of three parts.Working layer, also known as diamond layer, by the abrasive, binder and filler composition, is the working part of the wheel. Transition layer, also known as non-diamond layer, by the binder, metal powder and filler composition, the diamond layer is firmly connected to the substrate on the part.A base for receiving the abrasive layer, and, in use, firmly retained by the flange on the spindle of the grinding machine. General metal bonding agent products selected steel, alloy steel powder for the matrix; resin bonding agent used aluminum, bakelite as the matrix. From aluminum, steel or bakelite processing, starting from the support layer and the role of loading card abrasive. The quality of grinding wheel quality and use of high and low accuracy and the matrix has a great relationship.characteristicDiamond grinding wheel characteristics include the type of diamond abrasive, particle size, concentration, binder and shape and size.useAs the characteristics of diamond abrasives (high hardness, high compressive strength, good wear resistance), so that the grinding wheel in the grinding of hard and brittle materials and hard to become an ideal tool, not only high efficiency, accuracy High, and good roughness, abrasive consumption, long service life, but also improve the working conditions. Therefore, it is widely used in hard and brittle materials with low iron content, such as hard alloy, high alumina porcelain, optical glass, agate gemstone, semiconducting material and stone.classificationDiamond grinding wheel according to the binder can be divided into: resin-bonded diamond wheel; ceramic bond diamond wheel; metal bond diamond wheel (bronze bonded diamond wheel)Diamond grinding wheel can be divided according to the production process: sintered diamond grinding wheel (resin bonded diamond wheel; ceramic bonded diamond wheel; metal bonded diamond wheel); electroplated diamond grinding wheel; brazing diamond wheel.Diamond grinding wheel can be divided into: grinding diamond diamond wheel; grinding carbide grinding wheel with diamond (diamond knife grinding wheel); diamond grinding wheel with diamond grinding wheel; coreless grinding machine with heartless diamond grinding wheel; grinding ceramic products With diamond grinding wheel; cutting with diamond grinding wheel (also known as diamond cutting disc); diamond saw blade. Diamond wheel according to the appearance or shape can be divided into: parallel grinding wheel; cylindrical grinding wheel; cup-shaped grinding wheel; bowl-shaped wheel; dish wheel; edging grinding wheel;Diamond grinding wheel is used for abrasive machining of hard and brittle materials such as glass, ceramics, ferrite and semiconducting materials, grinding of metal materials, machining of carbide materials, grinding of electrolytic grinding and grinding of diamond bits in grinding centers Heavy cutting, with a good wear resistance, high efficiency, long service life characteristics