SU1028504A1 - Cutting knife for helical chopping mass - Google Patents

Abstract

1. CUTTING KNIFE FOR SPIRAL CUTTING MACHINES, including a plate with shshnnyh and short cutting 1fomkvm, characterized in that, in order to improve the quality of proouyushi in the cutting energy-intensity of the knife cutting process, aline cutting edges are made gear. 2. The cutting knife, according to claim 1, is about the fact that the teeth have angles of 6О-16О.

Description

The invention relates to tools for the production of timber and technopogical chips on milling and canting machines with spiral knife blades for face-conical milling and can be used in the sand and woodworking industry.

A cp cutting knife of spiral helix machines is known, which includes a plate with long straight cutting edges and two pyramid-shaped protrusions formed by the top and side planes of the floor and the dredging plane during sharpening Kopotw cutting edge til

Also known is a contour cutting knife, made in the form of a plate with two straight, long and two pairs of short cutting edges located at opposite ends of the knife (2.

However, the known constructions are characterized by poor quality of processing, especially of birch logs, which is caused by the type of cutting (transverse) and even with sufficiently sharp incisors (µm) due to their insufficiently high possibilities for cutting and cutting bark, and because of this longing the cutting edge of the knife and thereby an artificial increase in the thickness of the bark and the degree of bluntness of the cutting edge. At the same time, the ever-increasing shortage of raw materials for the woodworking industry dictates the need for a more complete use of thin logs, including in birch logs.

Known cutting knife for spiral shaving machines, comprising a plate with long and short cutting edges 3 3.

I

Cutting the bark to these knives is done well only at the cutting edge, where the angle between which and the longitudinal axis of the knife does not exceed 75. Expansion of the zone of sufficiently good cutting of bark through the change in the radius of curvature leads to an increase in the overall dimensions of the knife, and also reduces the number of possible his regrind.

The purpose of the invention is to improve product quality and reduce the energy consumption of the cutting process.

This goal is achieved by the fact that the long cutting edges are serrated & jagged, and the teeth have angles of 60-16. FIG. 1 shows cutting knife}

in fig. 2 - left view; in fig. 3 knife and wood sample with a cut.

The cutting knife for spiral chippers includes a plate 1 with mounting holes 2, short cutting edges 3 and long cutting edges 4 formed by teeth 5 with triangular peaks 6. The drawing shows a wood harvesting 7 with bark 8, where 9 is a layer of beech . The knife is mounted on the working tool column with, for example, a bolted joint (not shown in the drawings) and aperture 2.

The knife can be made in the following way.

A fixing hole 2 is made in the plate-shaped workpiece. Then the rear faces (planes) are formed with cutting edges 3 and 4, for example

5 milling. Next are formed

the tooth 5 on both sides of the knife, heat treatment, grinding and sharpening the edges 3 and 4.

The knife works as follows.

0 Slide on the workpiece 7, the knife with trihedral vertices 6 teeth 5 pierce bark 9 and further, penetrating into the bark 8 and cut them with transverse longitudinal cutting, i through artificially cutting the angular parameters of the incisors sharpened, reduced cutting angles. This contributes to the localization of stresses in the area of cutting 1FOMOK and better cutting of bark, which has great strength in the transverse direction of wood fibers; energy intensity is reached at angles (in plan) on a tooth x 5 D-60-160 5 At angles of X 160, bark accumulates in the cavity formed by adjacent teeth, and at angles, the technology of making the knife deteriorates and its overall dimensions increase. Short edge 3 works in the same way as the prototype, i.e. separates the cutting element of chips from the bulk of the workpiece 7, forming its size along the length of the cross-face cutting.

5 The effectiveness of the proposed knife is ensured by improving the quality of products when processing birch logs, which is achieved by improving the

neck success in cutting bereau of serrated xyuztur. With this also

you. Improving the conditions for cutting stock is ensured by reducing overall dimensions.

VIA birch bark achieves9 due to the size of the skin on% reduced yeni chshgannyh hromkov in viceenergy intensity of the cutting process.

Claims (2)

1. CUTTING KNIFE FOR SPIRAL CHAINING MACHINES, including a plate with long and short cutting edges, characterized in that, with a chain to improve product quality in reducing the energy consumption of the knife cutting process, the long cutting edges are made of serrated. 2. A cutting knife, according to claim ^, characterized in that the teeth have angles of 60-160 °.