SU897504A1 - Apparatus for longitudinal cutting of wood - Google Patents

Description

one

The invention relates to the machining of wood, namely to devices for longitudinal cutting of wood.

A device for longitudinal cutting of wood is known, which contains a saw blade with a crown of cutting and prying teeth, the cutting radius of the prying teeth is smaller, and the broadening is larger than that of the cutting teeth 1.

However, the known device does not provide high-quality cleanliness of the cut surface, since the front side cutting edges of the trimming teeth have a cusp angle of about 90, so they do not cut chips, but scrap it, creating tears, mossiness and hairiness.

The purpose of the invention is to increase the cleanliness of the cut surface.

The goal is achieved by the fact that in a device for longitudinal cutting of wood containing i saw blade with a crown of cutting and pinging teeth, the cutting radius of the prying teeth is smaller and broadening is greater than that of the cutting teeth, the rear side of the prying teeth has a negative rear the angle is 3-15 and forms an angle of 30-60 with the side edge on the side of broadening.

FIG. 1 shows a part of the device with a crown of cutting and scissoring teeth, a general view; in fig. 2 - the same, top view; in fig. 3 is a section A-A in FIG. one; in fig. 4 is a section BB in FIG. one; in fig. 5 is a sectional view BB in FIG. one; in fig. 6 is a diagram of the stationary formation during operation of the proposed device.

The slitting device comprises a saw blade 1 with a crown of several identical ones. tooth groups, each of which contains cutting teeth 2 and scissoring teeth 3 and 4. Cutting teeth 2 have two-sided Si broadening, positive rake angle y, positive rake angle el, and direct sharpening of the front and rear faces.

The trimming teeth 3 and A have an alternating unilateral Sn broadening greater than that of the cutting tooth 2, a positive rake angle of 2Gp, a straight sharpening of the front face, while the posterior edge of the trimming teeth has a negative posterior angle dij equal to 3-15, and forms with a side face on the side of broadening, angle H, equal to 30-60 ° angle of oblique grinding. With this arrangement of the posterior face, the posterior side cutting edge 5 is formed near the trimming teeth. In addition, the telescoping 11D1e teeth have a transverse cutting edge 6. Apex 7 of tooth 3 is underestimated relative to the cutting apex of tooth 2 by 1/3 and 3 depth of cut, i.e. the cutting radii Rn and R 2i of the trimming teeth are smaller than the Reiani radius R of tooth cutting.

The optimal absolute magnitude of the negative rear angle is determined by

1 h / B

where h is the depth of the cut-,

t is the length of the rear side cutting edge.

When the device is working, tooth 2 makes a narrow slit in the depth h of wood. Tooth 3 transverse cutting edge 6 cuts off chips 8, incised rear side cutting edge 5 of tooth 3 from the previous group. At the same time, the rear side cutting edge: 5 of the tooth 3 of this group separates from the wall of the cut (cuts) the next chips 9, which (cut by the transverse cutting edge of the tooth 3 of the next group. The tooth 4 repeats the work of the tooth 3 against the opposite wall of the cut.

Depending on the conditions of use, the proposed device may have variants.

975044

When formatting pruning, it is advisable to use one-sided broadening instead of double-sided alternating broadening of the trimming teeth. In order to increase the amount of technological chips by reducing sawdust, it is necessary to increase the number of scissor teeth and reduce the thickness of the cutting

0 tooth, while the thickness of the cutting tooth may be less than the thickness of the saw blade. When sawing with a large feed per tooth, you can increase the number of cutting teeth up to three, 5 this will reduce the load of the cutting and

eliminate the risk of damage to the carbide part of the teeth.

The proposed device allows to increase the machining quality by 2JJ of the cut surface, to obtain high-quality technological chips, and, in addition, the rear side cutting edges of the pinched teeth retain their sharpness much longer.

2J because their working width is significantly greater than the length of the front side edges, which has the effect of increasing the durability of the device.

invention formula

A device for longitudinal cutting of wood, comprising a saw blade with a crown of cutting and scissoring teeth, the cutting radius of the scraper teeth is smaller, and the broadening is greater than that, in order to improve the cleanliness of the surface of the cut, in the trimming teeth, the posterior face has a negative posterior angle of 3–15 and forms an angle of 30–60 ° with the lateral face on the broadening side.

Sources of information taken into account in the examination

1. USSR author's certificate No. 358148, cl. B 27 B 33/02, 197 (prototype). "7 p

Claims (1)

Claim A device for longitudinal cutting of wood, containing a saw blade with a crown of cutting and trimming teeth, and the cutting radius of the trimming teeth is smaller, and the broadening is greater, the check for trimming teeth, characterized in that, in order to improve the cleanliness of the cutting surface, of the adjusting teeth, the posterior face has a negative rear angle of 3-15 ° and forms an angle of 30-60 ° with the lateral side from the broadening side.