RU138438U1 - BAND SAW FOR CUTTING WOOD - Google Patents

Abstract

Band saw, including a band saw with teeth made with sharpening angles of the rake angle of 10 ° and the rear angle of 30 °, with a tooth layout according to the scheme, with a tooth cutting edge angle of 90 °, characterized in that the saw is additionally made with sharpening angles of the rake angle 4 °, or 7 °, or 9 °, or 13 °, back angle 32 °, or 34 °, or 39 °, or 29 °, defining tooth profiles 4 ° / 32 °; 7 ° / 34 °; 7 ° / 39 °; 9 ° / 29 °; 10 ° / 30 °; 13 ° / 29 °, while the tooth pitch is 22, 225 mm, the tooth height is 5.6-7.6 mm, and the tooth layout is made according to the scheme left-right-right.

Description

The utility model relates to the woodworking industry, in particular to band saws for sawing wood.

A utility model is known (Patent RU No. 108732, published: 09/27/2011), including a blade with teeth made with sharpening angles of the front and rear edges of the teeth, respectively, 10 ° and 30 ° and the wiring of the teeth according to the scheme left and right with the wiring size to side 0 , 38-0.50 mm. The saw is used with a width of 32-40 mm with a tooth pitch of 22 mm.

This saw is intended only for fine cutting of frozen wood and does not provide achievable removal of sawdust in other applications.

A utility model is known (Patent UA No. 81004, published: 09/27/2011), including a blade with at least one tooth made with sharpening angles of the front and rear faces of the teeth, respectively, 10 ° and 30 ° and the tooth layout according to the scheme. The tooth breeding scheme is carried out according to the scheme to the right - to the left - directly with the size of the teeth breeding in the direction of 0.52 ± 0.70 mm The radius at the junction of the blade with the tooth is 1.24 ± 0.2 mm, the height of the tooth is 6.25 ± 0.05 mm. The cutting edge of the tooth tip, as well as the entire edge of the tooth profile, is formed strictly perpendicular to the body of the blade.

In this technical solution, the disadvantages of the above technical solution are eliminated. The ability to cut a limited type of wood is achieved.

The disadvantage of this saw is the performance of this saw of one tooth profile and this does not give a wide range of possibilities to use it for sawing different types of wood with different hardness and density in different climatic conditions, on different sawing machines and the possibility of increasing the cutting speed.

This utility model is the closest analogue of the claimed solution, i.e. prototype.

The objective of the utility model is to expand the arsenal of band saws for sawing different types of wood in different climatic conditions in summer and winter.

The technical result consists in the implementation of this purpose, as well as in increasing the cutting speed while improving the quality of cutting, in reducing the power consumption, i.e. save energy and increase the life of the band saw.

The technical result is achieved by improving the band saw, including a band saw blade with teeth made with sharpening angles of the rake angle of 4 ° or 7 ° or 9 ° or 10 ° or 13 °, the rear angle of 32 ° or 34 ° or 39 ° or 29 ° or 30 ° and a tooth pitch of 22, 225 mm, defining a tooth profile of 4 ° / 32 °; 7 ° / 34 °; 7 ° / 39 °; 9 ° / 29 °; 10 ° / 30 °; 13 ° / 29 ° with a tooth cutting edge angle of 90 °, formed by a tooth height of 5.6-7.6 mm, and with a tooth layout according to the scheme left - right - straight.

Band saw - machine multi-cutting cutting tool for sawing wood with an endless (closed) flexible steel tape with teeth. The tape is driven by the pulleys on which it is worn. A band saw with appropriate geometry allows for longitudinal cuts.

A band saw consists of a steel band web with teeth, one at a time from the edges, in an amount of at least three.

The geometrical parameters of the saw are strictly balanced and optimally correspond to the type of sawn wood, engine power and are determined by:

- the profile of the tooth, which is formed at two angles - the front and back, in turn, the profile determines the height of the tooth,

- tooth pitch, the value of which is constant,

- tooth divorce pattern.

The band saw tooth profile has been developed and experimentally verified over the years and is an intellectually capacious product that has been tested on millions of sawn cubic meters of wood and is 4 ° / 32 °; 7 ° / 34 °; 7 ° / 39 °; 9 ° / 29 °; 10 ° / 30 °; 13 ° / 29 ° with a tooth pitch of 22, 225 mm.

The essence of the utility model is illustrated by drawings. In FIG. 1 - shows a diagram of a band saw, where C is the tooth pitch, A is the tooth height, E is the front angle of the tooth (hook angle), P is the back angle of the tooth.

In FIG. 2 - shows a band saw scheme with tooth profiles (sharpening angles) 4 ° / 32 °; 7 ° / 34 °; 7 ° / 39 °; 9 ° / 29 °; 10 ° / 30 °; 13 ° / 29 °.

The band saw (Fig. 1) contains a blade (1) with teeth (2) made with sharpening angles of the rake angle of 4 °, or 7 °, or 9 °, or 10 °, or 13 ° (3), and a rear angle of 32 ° , or 34 °, or 39 °, or 29 °, or 30 °, or 29 ° (4) (Fig. 2), with the wiring of the teeth according to the scheme left - right - right, with an angle of the cutting edge of the tooth 90, the tooth step is made size 22, 225 mm, and the height of the tooth is 5.6-7.6 mm.

The rake angle or hook angle (tilting the tooth forward) allows the teeth to penetrate themselves into the wood. The teeth should grab enough wood so that the saw itself immerses in the wood. The value of the hook angle is selected so as to reduce the feed force. If the rake angle is too large compared to the feed rate, this results in rattling of the saw and a rough, poor quality cut (washboard). If the angle of the hook is too small, you will have to force the saw into the wood, which reduces the cutting speed, and as a result, in most cases reduces productivity. Too large or too small rake angle increases the load on the blade, especially in the axils of the tooth, which leads to the formation of cracks and premature rupture of the saw. The rake angle is determined by the hardness of the wood. The tooth engagement angle should be selected based on the type of wood you are sawing. Soft wood requires large sharpening angles (10 ° -13 °). Hard, frozen or knotty wood requires smaller tooth angles (4 ° -10 °). A tooth angle of 10 ° is a good, versatile profile recommended for most sawing applications.

The back angle of the tooth is formed from the rake angle and determines the overall geometry of the tooth.

The height of the tooth should be large enough to ensure the removal of all sawdust from the cut by the cavity. Saws are supplied with different tooth heights depending on the tooth profile. Saws designed for sawing soft wood have higher teeth. Saws for sawing exceptionally hard wood or frozen logs have shorter teeth. The height of the tooth of the band saws is 5.6-7.6 mm.

Tooth pitch - the distance between each tooth from one tip to another. The pitch of the saw tooth is 22.225 mm, and should always remain the same. The calculation of the tooth pitch is based on the linear speed of the saw with the possibility of using less power.

Tooth divorce - the distance by which the tooth is bent beyond the plane of the saw blade, and is performed according to the scheme to the left - to the right - directly, suitable for sawing different types of wood. Tooth divorce is an important factor in the saw's ability to cut, and is necessary so that the blade (from the sinus to the back) moves freely in the cut. The saw tooth divorce, depending on the hardness of the sawn wood, is set to 0.46-0.76 mm. The wiring can be considered optimal when there is a mixture of 65-70% sawdust and 35-30% of air between the saw blade and the tree that it saws. An external manifestation of the saw being bred correctly is that approximately 80-85%) of sawdust is thrown from the saw.

The tooth profile in the band saws for sawing wood in the inventive utility model is made in six versions and are intended:

Profile 13/29 - designed specifically for cutting soft rocks with a restructured structure. This profile allows you to increase the cutting speed.

Profile 10/30 is a universal profile designed for sawing both soft, medium hard and hard wood.

Profile 9/29 - designed for cutting hard and frozen wood with high density.

Profile 7/39 - designed for sawing very hard wood on machines with an engine of less than 15 kW.

Profile 7/34 - designed for sawing very hard wood on machines with an engine of more than 15 kW.

Profile 4/32 - designed for sawing superhard and frozen wood species, recommended for industrial machines in the winter.

Table 1 shows the band saw tooth formation indicators.

Table 1 Front angle Back corner Tooth pitch Tooth profile Cutting angle Tooth height Divorce scheme 4 ° 32 ° 22,225 mm 4/32 90 ° 6.3 mm Left - Right - Straight 7 ° 34 ° 7/34 6.3 mm 7 ° 39 ° 7/39 6.3 mm 9 ° 29 ° 9/29 5,6 mm 10 ° 30 ° 10/30 6.3 mm 13 ° 29 ° 13/29 7.6 mm

The tooth profile is sharpened on a BMS500 or BMS250 grinding machine, and the wiring on a BMT100 or BMT200 or BMT250 or BMT300 adjustable machine, manufactured by Wood-Mizer.

When sharpening on Wood-Mizer grinding tools using the appropriate profiled grinding wheels, the tooth profile, its derived tooth height and tooth pitch remain unchanged.

Thus, the claimed utility model provides a technical result, using less power, the use of a band saw of the appropriate profile allows you to cut any wood species with different hardness and density in different climatic conditions in compliance with the high quality of the material obtained.

Claims (1)

Band saw, including a band saw with teeth made with sharpening angles of the rake angle of 10 ° and the rear angle of 30 °, with a tooth layout according to the scheme, with a tooth cutting edge angle of 90 °, characterized in that the saw is additionally made with sharpening angles of the rake angle 4 °, or 7 °, or 9 °, or 13 °, back angle 32 °, or 34 °, or 39 °, or 29 °, defining tooth profiles 4 ° / 32 °; 7 ° / 34 °; 7 ° / 39 °; 9 ° / 29 °; 10 ° / 30 °; 13 ° / 29 °, while the tooth pitch is 22, 225 mm, the tooth height is 5.6-7.6 mm, and the tooth layout is made according to the scheme left-right-right.

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