concrete cutting discs Grinding

Grinding or press-fitted by a coating on the abrasive particles lap by stone cutting wheels‍ lap and the workpiece relative movement at a certain pressure on the processing surface of the finishing process (e.g., cutting) concrete cutting blades. Grinding can be used for processing of various metals and non-metallic materials, surface machining with a flat shape, inner cylinder and the outer conical surface, convex and concave spherical, threads, and other stainless steel cutting wheels type of tooth surfaces. Processing accuracy IT5 ~ 01, the surface roughness up Ra0.63 ~ 0.01 microns.

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stainless steel cutting discs abrasive grinding

Wet grinding method can be divided into research, research and semi-dry grind three categories. ① wet grind: grinding, also known as sand deposited, the continuous filling or depressed center cutting wheel coating liquid abrasive surface grinding, abrasive between the workpiece and the lap constantly sliding and rolling to form a cutting motion. Wet research generally used for rough grinding, abrasive powder used coarse granularity in W7. ② Dry RESEARCH: also known as embedded sand grinding, pressing the abrasive embedded in the uniform surface layer of the lap, the polishing lap only the auxiliary material coated with a small amount of fat stearate and the like. Research commonly used in dry fine grinding, fine grit size used in the W powder grinding machine. ③ semi Research: Research similar wet, the use of abrasive grinding paste is a paste. Either by hand polishing, polishing may be performed on the machine. Workpiece by other processing methods must first be obtained in a high precision before the pre-polishing, polishing the left margin is generally 5 to 30 microns.

Lap is shaping the workpiece grinding tools, but it is also the carrier of abrasive hardness should be less than the hardness of the workpiece, but also some wear, often made of gray cast iron. Wet grind lap ferrite microstructure dominated; dry grind lap uniform and fine pearlite places as the matrix. The following grinding M5 concrete cutting discs thread and small parts of complex shape, commonly mild steel lap. When grinding holes and soft metal materials, mostly made of brass, copper lap. Lap should be sufficiently rigid working surfaces have a high geometric precision. Lap grinding and cutting process is also subject to wear, such as operating properly, its accuracy can be improved, so that the processing accuracy of the workpiece can be higher than the lap of the original accuracy.

To correctly handle abrasive grinding trajectory is to improve the quality of an important condition. In surface grinding, the general requirements: ① workpiece relative to the movement of the lap, to try to ensure that similar grinding stroke length of each point on the workpiece; ② workpiece trajectory evenly throughout the surface of the lap, lap facilitate uniform wear; ③ sports changes in the curvature of the trajectory to be small in order to ensure smooth movement of the workpiece; ④ workpiece trajectory took a little premature to avoid repeated periodically. Pictured common plane grinding trajectory. In order to reduce the thermal cutting, grinding generally low under low pressure conditions. Coarse stainless steel cutting wheels‍ grind pressure does not exceed 0.3 MPa, lapping pressure generally use 0.03 to 0.05 MPa. Coarse grind speed is generally 20 to 120 m / min, lapping speed generally take 10 to 30 m / min.‍

LEMAN concrete cutting wheels Consumables

With grinding equipment used mainly supplies wheel, belt and other products. 

Abrasive belt with the aid of high-voltage electrostatic reinforced concrete cutting wheels‍ field force, the fine grains planted on a high-strength film, so abrasive can be directed evenly distributed, can provide higher grinding efficiency and bright delicate polished effect. Abrasive grains include aluminum oxide, silicon carbide. Suitable polishing materials of different hardness. 

Applications of these products is very wide, can be applied: 

1 class printing roll grinding and polishing, as WC Corrugated, rubber roller, mirror roll, ceramic anilox and other products; 

2 crankshaft, camshaft, gear shaft and so shaft products grinding and polishing; 

3 Body of grinding and polishing, such as electrophoresis depressed center cutting wheel‍ and OEMs in the paint shop painted on the body after the grinding and polishing; 

concrete cutting blades Grinding diagram Method

1) Cylindrical Grinding 

Note: ① grinding Cylindrical grinding or finishing in general reinforced concrete cutting disc‍ on the basis of. Hand in cylindrical grinding lathe, coated abrasives between the workpiece and the lap, the workpiece driven by rotation of the spindle lathes, and research support with hand axially reciprocated. 

② mechanical polishing on cylindrical grinding machine generally used cylindrical grinding ball type parts. 

2) grinding the inner circle 

Description: After grinding the inner circle need grinding, fine or fine boring hinges conducted, usually by hand grinding. Sleeve for the opening lap, set in taper spindle abrasives applied polishing discs‍ between the workpiece and the lap, holding the workpiece axially reciprocated. After grinding a certain time, to adjust the direction of the big end of the tapered mandrel sleeve, so that the diameter swell, to maintain pressure on the workpiece bore wall. 

3) grinding plane 

Description: grinding plane generally conducted after grinding. When hand-grinding flat, coated abrasives in grinding plate (lap) on hand for linear reciprocating motion artifacts or "8" shaped movement. Some time after grinding, the workpiece is turned 90 ° ~ 180 °, to prevent inclination of the workpiece. For topical facets to be RESEARCH, square hole, slit, etc. on the surface of the workpiece can also be a handheld grinding lap. Larger quantities of simple reinforced concrete cutting wheels‍ plane parts also on the ground in a surface grinding machine. 

oncrete cutting discs Cylindrical Grinding

Note: ① grinding Cylindrical grinding or finishing in general on the basis of. Hand in cylindrical grinding lathe, coated abrasives between the workpiece and the lap, the workpiece driven by flat cutting disc rotation of the spindle lathes, and research support with hand axially reciprocated oncrete cutting discs. 

Grinding diagram (8) 

② mechanical polishing on cylindrical grinding machine generally used cylindrical grinding ball type parts. 

2) grinding the inner circle 

Description: After grinding the inner circle need grinding, fine or fine boring hinges conducted, usually by hand grinding. Sleeve for the opening lap, set in taper spindle abrasives applied between the workpiece and the lap, holding the workpiece axially reciprocated. After grinding a certain time, to adjust the direction of the big reinforced concrete cutting disc‍ end of the tapered mandrel sleeve, so that the diameter swell, to maintain pressure on the workpiece bore wall. 

3) grinding plane 

Description: grinding plane generally conducted after grinding. When hand-grinding flat, coated abrasives in grinding plate (lap) on hand for linear reciprocating motion artifacts or "8" shaped movement. Some time after grinding, the workpiece is turned 90 ° ~ 180 °, to prevent inclination of the workpiece. For topical facets to be RESEARCH, square hole, slit, etc. on the surface of the workpiece can also be a handheld grinding lap. Larger quantities of simple concrete cutting wheels‍ plane parts also on the ground in a surface grinding machine.

LEMAN concrete cutting wheels Features and Application Process

① simple equipment, less demanding accuracy. 

② reliable processing quality. Ra value obtained concrete cutting blades‍ with high accuracy and low. But generally does not improve the positional accuracy of the machined surface and the other surface. 

③ process a variety of steel, hardened steel, cast iron, copper and aluminum and its alloys, tungsten carbide, ceramic, glass and some plastic products. 

④ grinding is widely used in single and small batch stainless steel cutting wheels production of various high-precision machined surfaces, and can be used in a large number of mass production.

concrete cutting blades Film coated tools

Film coated tools are in good rigidity and high temperature properties of diamond thin films deposited on the collective material made ​​by chemical vapor deposition (CVD) Tile cutting discs‍ tools. 

Since the Si3N4 ceramics, WC-Co-based heat expansion coefficient of diamond and metal carbide of W close to the small thermal stress generated during film, so can be used as the base material of the cutter body. WC-Co based cemented carbide, a binder phase of Co easy to make the presence of the substrate between the diamond film and the adhesive strength is reduced to form the graphite, need to be pretreated prior to deposition to flat cutting disc remove the effect of Co (generally by acid etching to Co) . 

Chemical vapor deposition method is a method of using a C-containing gas source to activate, at very low gas pressure, a certain area of the carbon atoms deposited on the carbon atoms in the condensation formed during the deposition of the diamond phase. Currently used for the deposition of diamond by CVD include: microwave, hot filament, DC arc jet method. 

Advantages of diamond films are used in a variety of complex geometry tools, such as a blade with chips, end mills, reamers and drills; may be used to cut a lot of non-metallic materials, cutting force when cutting small, small deformation, smooth, slow wear, easy deformation of the workpiece for the workpiece material, concrete cutting disc‍ tolerances finishing. The main disadvantage is the poor adhesive strength of the diamond film and the substrate, the diamond film having no regrinding of the cutting tool. 

concrete cutting discs thick welded diamond cutting tool

Thick welded diamond cutting tool production process generally includes: preparation of large area diamond film; film cut diamond cutter shape and size needed; welding concrete cutting blades‍ and cutting tool diamond thick film substrate material; thick cutting edge diamond grinding and polishing . Preparation and cutting (1) diamond thick 

Commonly used process for the preparation of diamond thick DC plasma jet CVD method. The diamond deposition to WC-Co alloy (mirror surface processing) on the substrate in the cooling process, the diamond film off automatically. This method of depositing speed (up to 930μm / h), relatively close bonding between the lattice, but the rough growth surface. Diamond films with high hardness, wear resistance, non-conductive determines its cutting method is laser cutting (cutting can be carried out in air, oxygen and argon environment). Not only can the use of Tile cutting discs‍ laser cutting diamond thick cut to the desired shape and size, but also the angle of the tool can be cut out, with a narrow slit, the advantages of high efficiency.

LEMAN concrete cutting wheels Thick welded diamond cutting tools

Between the diamond and having the general metal and alloys of high surface energy, resulting in a diamond can not be a general low melting point alloy infiltration, poor weldability. reinforced concrete cutting wheels‍ At present, by adding strong carbide forming elements or through the diamond surface treatment of metal and metal to enhance the diamond between the solderability of copper-silver alloy solder. 

① active brazing method 

Generally with copper-silver alloy solder containing Ti, without soldering flux in an inert gas or in vacuum. Commonly used solder composition Ag = 68.8wt%, Cu = 26.7wt%, Ti = 4.5wt%, is used for preparing an arc melting method and the powder metallurgy method. Ti as an active element in the welding process flat cutting disc‍ and generate C reflected TiC, improved wettability and adhesion strength of the diamond and the solder. The heating temperature is generally 850 ℃, incubated 10 minutes, slow cooling to reduce internal stress. 

② After the surface of the metallized pads 

Metallized diamond surfaces by surface treatment technology of metal plating on the surface of the diamond, so that the surface having the properties of the metal or metalloid. Generally in the surface of the diamond plating Ti, Ti C reacts with TiC, TiC and Ag-Cu solder alloy has a good wettability and bonding strength. Titanium currently used methods are: the physical vacuum vapor deposition (PVD, including vacuum evaporation deposition, vacuum sputtering, vacuum ion plating), chemical vapor plating coverage and powder sintering. Single plated PVD method is low, diamond plating process temperatures below 500 ℃, the physical attachment between the coating and the diamond, no chemical metallurgy. concrete cutting blades‍ Diamond CVD method Ti react with a strong metallurgical bond is formed, the reaction temperature is high, damage to the diamond.

concrete cutting blades Thick diamond tool sharpening

Thick diamond cutter processing methods are: mechanical grinding, polishing hot metal plate, ion beam, laser beam and plasma etching. 

Diamond sintered flat cutting disc‍ body tool 2.3 

The diamond thick film processing methods using a rolling average particle size of abrasive damage to the diamond grains of 32 ~ 37μm or directly obtained using Method HPHT diamond grains, grain powder piled on the WC-16wt% Co alloy, and then Ta foil to isolate and sintered at 5.5GPa, 1500 ℃ for 60 minutes to prepare a diamond sintered body, the sintered body with the tools with high wear resistance. 

2.4 monocrystalline diamond tool 

Single-crystal diamond cutter diamond crystal is usually the head of fixed knife, knife head with a screw or plate fixed on the Tool Bar. Diamond knife fixing method in the head are: mechanical reinforcement method (pressing surface and the bottom surface of the polished diamond with the knife head is fixed to the pressing plate); powder metallurgy (diamond in the alloy powder by adding the pressure in the vacuum sintering, the diamond knife reinforced concrete cutting wheels‍ head is fixed); bonding and brazing (using an inorganic adhesive or other adhesive fixing diamond). Since the thermal expansion coefficient of diamond and matrix disparity, diamond easy to loose.

LEMAN concrete cutting wheels monocrystalline diamond tool

There are still some key issues need to be addressed, such as stainless steel cutting discs‍ diamond thick film deposition processes high-speed large-area, controlling diamond film grain boundary density and defect density of the diamond industry, the low-temperature growth of diamond film, diamond film and the substrate binding force and weak. Diamond Tool superior performance and broad development prospects attracted numerous experts to study abroad, and some have made ​​a breakthrough, I believe that in the near future will be widely applied to the flat cutting disc‍ diamond cutter modern machining.

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