• Semiautomatic CNC Grinding Machine For Face Mills VZ-652F2

A semiautomatic machine (further referred to as the “machine”) is designed for grinding of face mills with 80-630 mm diameter with cutting edge made of carbide composition, cemented-oxide, tool or high-speed steel. Grinding is performed by the face of abrasive, diamond or boron nitride wheel with/without cooling. Grinding by the diamond wheel face with cooling is combined with electro erosion dressing. All straight cutting edges – main, auxiliary and transitional ones - are ground operation by operation.

Grinding parameters – number of teeth, feed and number of machining passes of rough machining, feed and number of machining passes of final machining, number of sparkout passes - are programmed by operator on control panel.

Quotation for the system of computer-aided design of control programs for PC-based manufacturing and grinding of cutting tools, as well as for control programs for machining of special tool types and other articles is sent on request.

The machine is equipped with a wheelhead combined with a grinding wheel dressing and wear compensation mechanism that travels along the base and workpiece headstock that also moves along the base perpendicular to wheelhead travel.

Wheelhead is able to swivel in the vertical plane to adjust wheel position for ensuring the selected clearance angle of the mill’s cutting edge. Workpiece headstock can swivel together with the mill in the horizontal plane to adjust to cutting edge angle value of the mill cutter.

Reciprocative travel (oscillation) of the grinding wheel is a line feed during grinding process and perpendicular to it periodical travel of the workpiece headstock with the mill is a cross feed.

There is a stop on the workpiece headstock case, which helps to place each mill cutter to be ground in suc-cessive order strictly to the definite position in relation to the grinding plane.

Features of SIEMENS SIMATIC S7-300 controller (Germany)

Application of the modern controller SIMATIC S7-300 allowed to increase greatly the reliability and to expand functionability of the machine. Application of various functional modules has solved the problem of machine cycle control.

Input modules SM321, which design and circuitryenable operation reliability, enable to diagnose triggeringof position switches and electrical circuitry sensors of themachine, are connected to external electrical circuitsthrough optically coupled input that increases greatly reliability and noise resistance. So failure of one of the input cells is not followed by drop-out of the other elements of the input module as there is no galvanic coupling between external circuits of machine’s electrics andmodule’s electrical circuitry itself. Presence of each inputsignal is indicated by LED on the model’s front panel that enables to trace triggering of the input elements.

Output modules SM322 are used for connection with executive elements of the machine’s electrics. It should be noted that quite high load ability of the output modules enables to commutate directly magnetic starters and electric magnets of hydrovalves. Application of relay elements in the output modules also enabled to isolate electrically external electrics chains and module’s electrical circuitry itself. Triggering of each output signal is indicated by switch-on of corresponding LED on the module’s front panel that enables to trace triggering of the output elements.

Positioning module for stepper drive FM353 in combination with positioning module for stepper motor FM STEPDRIVE as well as high precision stepper motor SIMOSTEP control feed process. Application of special screened cables enabled to increase greatly interference immunity of the process.

Essential role in the structure of the control unit is played by multifunctional operator panel OP17. Application of operator panel OP17 enabled to eliminate machine control panel as control elements located on the panel can obtain required functions. A display on the panel enabled visualization of the whole process of machine control. Information on the stock being removed, diagnostic messages and other information is displayed on the screen.

Besides, reliable hermetic modules provide more safety. So with the help of wellproven front connectors one can change modules without new electrical mounting. These connectors are reliably coded against wrong connection and terminals are normalized.

Base

Rigid iron casting, on which machine units are mounted. There are chutes in the upper part of the base along which lubricoolant is directed to the cooling tank. Cutting zone is covered by a guard with transparent windows, which can be easily moved while adjusting.

Workpiece headstock

Rigid cast-iron framing. The spindle is mounted on high-precision bearings. Mill tooth indexing is performed by hydraulic drive controlled by photoimpact transducer.

Feed drive

Worm reducer of the feed drive with rotation from stepper motor. The worm with possibility of axial adjustment for mesh backlash takeup. The feed is obtained through high precision recirculating ball screw-and-nut.

Wheelhead with dressing mechanism

The grinding spindle is mounted on high-precision antifriction bearings. Rotation is transferred to spindle from electric motor through V-belt drive. The wheel is dressed with diamond fixed in the arm support driven by hydraulic cylinder.

Basic modes

  • automatic milling cutter (semi-automatic mode);
  • sharpening with feeding per each revolution;
  • grinding with a tooth feed.
To sharpen the back plane of the milling cutter, it is first necessary to install it so that the auxiliary edge assumes a horizontal position and the milling axis is inclined in the vertical plane by the amount of the front corner of the auxiliary cutting edge. At the end of the process, the cutter must be examined for chips, cracks and other defects, and also check the roughness of the base of the treated surface.

Video semiautomatic CNC Grinding Machine For Face Mills VZ-652F2


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Technical description
The parameters marked with (*) are specified at the stage of the technical task coordination.
Product Indicators, machined:
Size of the blank to be installed Diameter range of the ground mills, mm 80…630
Number of the ground cutters 4…120
Clearance range, deg. 5…23
Taper hole diameter in the workpiece headstock spindle acc. to GOST standard 15345-82 50 AT6
Max. weight of the installed mill (including arbor), kg 125
Parameters of working and adjustment travels:
Max. working travels along controlled coordinate axes: Grinding wheel assembly travel, mm:
vertical 220
horizontal along/with (max.) the table 645/150
Grinding wheel assembly swivel angle around horizontal axis, deg. 25
Performance tool that is installed on the machine:
Dimensions of the installed wheel, mm External diameter, mm 150
height of abrasive grinding wheel type 6 acc. to GOST standard 2424-83, mm 80
height of diamond grinding wheel 2724-0040 acc. to GOST standard 16172-90, mm 40
Indicators of primary and secondary movements:
Discreteness of travel assignments along coordinate axes Increment of workpiece headstock travel assignment, um 1
Spindle speed, rev / min Rotation speed range of the workpiece headstock spindle during indexing (stepless regulation), min-1 4…30
Rotation speed of the grinding wheel assembly spindle, min-1 1800,3600
Indicators Power of machine:
Power of the main motion motor, kW 2/2,65
The total capacity of electrical equipment, kW 3,64/4,29
Dimensional characteristics:
Dimensions (LxWxH) mm 2080×2210×1795 (without separately placed equipment)
Weight, kg 2600

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Semiautomatic CNC Grinding Machine For Face Mills VZ-652F2

  • Product Code: VZ-652F2
  • Availability: Pre-Order