In recent years, China's automobile, power generation equipment, mold manufacturing and other industries have introduced a large number of machining centers and supporting CNC tools from abroad. In order to cooperate with the effective use and localization of all kinds of imported CNC tools of Shanghai General Motors Co., Ltd., our company set up a tool sharpening center, and introduced the world's most advanced CNC tool grinding machine from SORENCO, Denmark, to make our company The level of tool manufacturing and sharpening technology has been greatly improved, enriching the variety of tools and sharpening tools manufactured by our factory, and improving the processing capacity of all kinds of solid carbide and high speed steel tools. 1. Introduction of US250 CNC Tool Grinder
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At present, the CNC tool grinding machines introduced in China are mainly products of well-known foreign manufacturers such as Walter Company of Germany and SORENCO of Denmark, and their performances are unique. After comprehensive consideration of various factors, our company finally decided to introduce the US250 CNC tool grinding machine from SORENCO, Denmark. The machine is equipped with FANUC numerical control system and microcomputer processing system. It adopts six-axis five-link linkage. The six transmission shafts are X, Y, Z, U, A and W axes (see picture). The drive shaft is driven by servo motor, which can guarantee high. Transmission accuracy. The spindle can be fitted with three different grinding wheels to meet the machining requirements of different workpieces. The machine has high coolant flow rate, high pressure, sufficient cooling, automatic circulation, and is equipped with an oil mist filter and an oil cleaning centrifuge to automatically separate impurities and iron filings from the coolant.
Grinding wheel is an important part of CNC tool grinding machine. According to the grinding wheel material, it can be divided into diamond grinding wheel and cubic boron nitride grinding wheel, which are used for grinding of cemented carbide tool and high speed steel tool respectively. According to the shape of grinding wheel, it can be divided into flat grinding wheel. The bowl-shaped grinding wheel and the disc-shaped grinding wheel have the following processing ranges:
Plane grinding wheel: It is used to machine the cutter groove shape and the grinding back. By changing the eccentric amount, different tool groove shapes can be milled, such as circular grooves of drill bits and reamer.
Bowl-shaped grinding wheel: used for machining the flank of the end tooth of the tool, such as machining the end angle of the end of the end mill.
Dish-shaped grinding wheel: It is used for the opening processing of the front and outer circumferential teeth of the tool end teeth.
The numerical control tool grinding machine has the advantages of high production efficiency, high processing precision, good cooling performance, good processing flexibility, and no cutting edge of the grinding tool edge (to ensure smooth cutting of the tool).
2, processing product categories
The CNC tool grinding machine can grind and process all kinds of carbide tools and high-speed steel tools, such as ball end milling cutters, step forming milling cutters, internal cooling fuel injection drills, reamers, step twist drills, taper milling cutters, etc. For example, the step forming cutter is difficult to meet the processing requirements with ordinary machine tools. Now it is processed by CNC tool grinding machine. The grinding wheel is continuously ground according to the pre-programmed procedure. After the machining, the inflection points of the tool are smoothly connected, which can ensure the machining accuracy. For example, the large outer circle and the small outer circle connecting part of the step twist drill are processed by a general method, and a shoulder (small plane) is often generated, and the numerical control tool grinding machine is used to ensure that the joint surface is smooth and has no shoulder.
3, the typical process of processing products
Processing of chip milling groove of ordinary grinding end mill
Adjusting the relative position of the grinding wheel and the workpiece by the movement of the X, Y and Z axes;
When grinding the chip pocket, the A-axis rotates and the U-axis feeds straight to complete the chip pocket processing.
Machining of chip flutes for taper end mills
The taper of the taper end mill requires equal pitch and equal front angle to ensure the same cutting performance at each outer circle of the end mill. Ordinary machine tools can only process the lead-passing chip pockets, can not process the pitch, the front corner chip pockets, and need to be continuously tested during machining to obtain a better groove shape. The machining process of CNC tool grinding machine is:
Adjusting the relative position of the grinding wheel and the workpiece by the movement of the X, Y and Z axes;
When the chip pocket is ground, the A-axis rotates, the U-axis feeds linearly, and the Z-axis moves from top to bottom to complete the chip pocket processing.
Ball-end milling cutter chip pocket processing
The ball-end milling cutter chip groove is required to be a spiral groove, and the cutting edge is over the center to ensure smooth cutting and convenient chip removal. The machining process of CNC tool grinding machine is:
Adjusting the relative position of the grinding wheel and the workpiece by the movement of the X, Y and Z axes;
When the chip pocket is ground, the A-axis rotates, the U-axis feeds in a straight line, and the W-axis rotates to complete the chip pocket processing.
Milling cutter, drill bit, reamer, peripheral tooth rake angle, end tooth rake angle, end tooth back angle and chisel edge machining
The numerical control tool grinder can change the processing of the chip pocket, the front corner, the back corner and the chisel edge in the case of one clamping of the workpiece by changing the grinding wheel clamped on the main shaft. 