SU961925A1 - Method of backing-off composite hob - Google Patents

Description

one

The invention relates to mechanical engineering, in particular, to tool production, and can be used in the process of cutting prefabricated worm milling cutters with an arbitrary profile of the production contour.

There is a known method of cutting of modular worm cutters, according to which gear-cutting slats displace the cutters from the working position in the process directional direction in an axial direction and grind them like a continuous helical surface 1.

Significant disadvantages of the method, limiting the effectiveness of its use, are the impossibility of grinding up slotted and shaped worm cutters, as well as separate processing of opposite sides of the teeth, which leads to an increase in the number of disassemblies and tool assemblies in the process of grinding, and consequently to a decrease in its accuracy.

The purpose of the invention is to improve the accuracy of the sealing.

This goal is achieved by the fact that the gear cutting rails are displaced in the cutter body or technological screw to the technological position in the tangential direction.

FIG. Figure 1 shows the gear cutting displacement with the diameter of the technological screw, the larger diameter of the screw mill;

5 in FIG. 2 - the same, with the diameter of the technological screw, smaller than the diameter of the screw mill.

FIG. 1 and 2 the following notation is accepted: 1 - working position of the gear-cutting

Q slats in the case of a heart mill; 2 - the technological position of the gear-cutting rail in the case of the milling cutter; 3 - groove of the cutter body or technological screw; Oi is the axis of the worm cutter; From - the axis of the technological screw, coinciding with the axis

15 Worm milling cutter; Opr - fictitious axis of the technological screw, necessary for calculations; du is the outer diameter of the worm cutter; dar is the outer diameter of the technological screw; a back angle at the tip of the 2Q cutting edge of the worm cutter; the angle that determines the direction of displacement of the gear-cutter rails to the technological position in the tangential direction. The magnitude of the rear angle оС .ООМОгр is determined by the distance between the Ochch and He axes, equal to Н - the displacement of the gear-cutting rails in the tangential direction and the direction of the segment Ou.O with respect to the axis Ots, M, i.e. the angle. The shift of the gear-cutting racks to the technological position for all is of the same magnitude and can be carried out, for example, with the help of measuring spacers.

In position 2, the rear side surfaces of the teeth of the worm milling cutter lie on the surface of one worm and are zaled (polished) like an ordinary worm.

This nature of the gear-cutting rails to the technological positions in their grooves of the screw mill body in the tangential direction allows processing the opposite sides of the teeth of the rails at the same time, while reducing the number of disassembling assemblies, increasing the productivity and accuracy of cutting, also allows machining the hearth mills not only with a flat bar profile, but also slotted, shaped and others.

Claims (1)

1. "Diamonds and superhard materials, 1979, No. 4, M., NIIMASH, p. 13-14. au FROM phage /