SU471096A1 - Chain saw - Google Patents

Description

(54) SAWING SAWS

A saw tooth is known, for example, to devices for cutting ice, consisting of a connecting link with fixing holes, a cutting head, a shank and a limiter of the chips to be removed.

However, such a tooth has a cutting edge of a curvilinear shape, which is perpendicular to the vector of cutting speed. This leads to an increase in feed force, a decrease in sawn productivity and an increase in energy consumption for cutting ice.

The purpose of the invention is to reduce the energy consumption for the destruction of ice and the force of feeding and cutting during the destruction of ice, to ensure free movement of the saw chain in the ice saw and stable position of the tooth during the cutting process, as well as to increase the service life of the tooth and reduce the width of the kerf.

To do this, in the proposed tooth, the cutting head is made т tigranny with the formation at the junction of the faces of three cutting sections - the front and two side, each of which has the shape of a triangular pyramid. At the same time, the front face of the front cutting section has a taper angle of 80-90 ° and is located at a cutting angle of 40-48 °, and its lower edges form an edge at the intersection located at an angle of 7-9 ° to the horizontal.

It is advisable to install the cutting edge of each side section located at the junction of the front and side faces at an inclination angle of 7-10 °, and the edge formed at the junction of the side edge with the lower edge - at an angle of inclination of 10-15 °.

In addition, it is advisable to perform the limiter of the thickness of the removed chips with two chamfers rounded in front, and the shank to be made with a thickness less than the thickness of the middle part of the connecting link.

FIG. 1 shows the described tooth in three projections; in fig. 2 - the front face of the front rezhesh part of the tooth; in fig. 3 - a general view of a tooth in the cut of ice.

The tooth consists of the cutting head 1, the middle part of the connecting link 2, the limiter 3 of the thickness of the removable chips and the shank 4. The cutting head has five faces: the front 5, two side 6 and two lower 7.

At the junction of these faces, three cutting sections are formed — the front 8 and two lateral 9, each of which has the shape of a triangular pyramid. The front face 5 of the front cutting section 8 (see Fig. 2) has a taper angle Φ 80-90 °, it is located at a cutting angle 40-80 ° (see Fig. 1).

The lower edges 7 at the mutual intersection form an edge located at an angle

P 7-9 ° to the horizon, and their cutting edges

at the junction of the front 5 and side 6 faces have an angle of inclination pi 7-10 °, the edges at the junction of the side and lower edges are located at an angle of p2 10-15 °.

The limiter 3 of the thickness of the removed chips has two chamfers 10 with rounding in front. The thickness of the shank 4 is less than the thickness of the middle part of the connecting link 2.

The tooth of the saw chain for cutting ice works as follows.

The specified angles of inclination of the straight cutting edges in the three cutting sections (8 and 9) when the tooth moves in the direction of the cutting speed vector V (see Fig. 3) facilitate the penetration of the tooth into ice by a large amount h with a lower feed force R. This ensures an increased sawing performance, reduced device weight and easier handling. The deep cleavage of ice by the side sections 9 on the side walls of the cut 11 provides free movement: a chain in the cut.

Subject invention

Claims (5)

1. A tooth of a saw chain, for example, to an ice-cutting device, consisting of a connecting link with mounting holes, a cutting head, a shank and a thickness limiter for the removable chips, characterized in that, in order to reduce the energy consumption for breaking ice, the cutting head It is made of a polygon with the formation at the junction of the faces of three cutting sections - the front and two side, each of which has the shape of a triangular pyramid. 2. A tooth according to Claim. 1, characterized in that, in order to reduce the feed and cutting force when breaking ice, the front face of the front cutting portion has a taper angle of 80-90 ° and is located at a cutting angle of 40-48 °, and its lower edges at the intersection form an edge placed at an angle of 7-9 ° to the horizon. 3. A tooth according to claim 1, characterized in that, in order to ensure free movement of the saw chain in the ice cut, the cutting edge of each side section located at the junction of the front and side faces has an angle of inclination of 7-10 °, and the edge formed at the junction of the side face with the bottom, it has an angle of inclination of 10-15 °. 4. Tooth on PP. 1-3, characterized in that, in order to ensure its stable position during the ice-cutting process and increase reliability in operation, the thickness limiter of the removable chips is made with two chamfers rounded in front. 5. Tooth on PP. 1-4, characterized in that, in order to reduce the width of the cut and increase the service life, the thickness of the shank is less than the thickness of the middle part of the connecting link.