SU990522A2 - Cutting blade for helical chopping machines - Google Patents

Description

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The invention relates to the tools for the production of timber and the technological chain on milling and fususchisch machines with spiral blade discs butt-conical milling and can be used in the timber and woodworking industry.

According to the main author. St. No. 618285 is known a cutting knife for spiral rulers of Y1TEL machines, including a plaster with upper and side surfaces, having long and short cutting edges, concave with extruded 1 1

The disadvantage of this is the low quality of the treated surface due to the height of the kinematic irregularities. The height of these irregularities H1 is in the following relationship with the parameter of the curvature of the edge (boom edge in the plane of the knife on the rear face) and the back angle at-bin ai - At the same time, the roughness RX of the overall roughness reaches the total value

. .

The first invention is to improve the quality of processing.

This goal is achieved by the fact that the rear face, with a long 1-cutter, is made as part of a cylinder.

FIG. 1 shows the proposed knife, a general view; in fig. 2 - the same, view reconciliation; in fig. 3 - section aa

fO in FIG. one.

The cutting knife consists of a plate 1, a long concave cutting edge 2 and a short cutting edge 3 formed by the intersection of the circumferential bent front edge 4, having a Vt deflection boom with a convex rear face 5 with long edges 2 and rear edges 6 with short edges 3. On; inactin 1 a mounting hole is made

20 7. For the installation of the knife, there are columns 8 and 9 - the face of the fuse, and chips 10.

Plate 1 is mounted on column 8 and secured, for example, by bolting (ve) shown at a required angle of cL. With an appropriate ratio of the radius of the concavity of the front grungy 4 and the convexity of the rear face.with a variable radius of curvature of the rear face)

The proposed knife works as follows.

During the rotation of the milling cutter (not shown), the plate 1, fixed on the column 8, cuts off a layer of chips 10 from the face 9, forming the surface of the pilomator ala. Chips 10 are removed along the front face 4 of plate 1. Since the length of the shank is 2, it forms; Since the surface of the sawn timber 9, in this knife lies in the computational plane of this surface, then the kinematic irregularities can be rendered due to non-continuous end beats of the working organ and the directly processed material.

When using a knife with a back face made with a radius of curvature of R-COnst, i.e., pilishphic, approximating within the rear face of the surface cRiftCOHSi; , there may be a kinematic unevenness i up to a height of zoo microns. However, such irregularities do not limit the use of lumber. At the same time, the knife making technology is greatly simplified, since it becomes possible to use a simpler sharpening process instead of milling to form the back face. At the same time, the set of knives is fixed on the underside mounted on the chuck of the carving machine, moreover, so that the longitudinal axes of the knives are parallel to the axis of rotation. All knives are machined at the same time along radius R.

The effectiveness of the proposed knife

This is achieved by improving the quality of sawn timber by reducing the kinematic irregularities by more than two times by giving back

forms that help Bot bring the long cutting edge of the knife into the calculated machining plane in the presence of a back corner at this edge. It is also possible to reduce allowances.

on machining fus.

Claims (1)

Invention Formula Cutting knife for spiral chipping machines according to ed. St. No. 618285, characterized in that, in order to improve the quality of processing, the rear face with a long cutting edge Made as part of a cylinder.  Sources of information taken into account during the examination 1. USSR author's certificate No. 618285, cl. B 271 11 / O2, 1977. Fiá.1  coveinpo / Fig.Z