RU22445U1 - DISK SAW WITH A DIAMETER FROM 400 TO 560 MM FOR CUTTING CONIFEROUS WOOD - Google Patents

Description

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DISC SAW WITH A DIAMETER FROM 400 TO 560mm FOR CUTTING CONIFEROUS WOOD

The utility model relates to the field of sawmilling and

woodworking, in particular to circular saws, and can be

used in various milling and sawing

devices designed for longitudinal processing of wood

conifers.

Known circular saws, (GOST 980-80 "Round circular saws for sawing wood). They are made of alloy steel and with diameters from 400 to 5b0mm have a thickness of 2 to 2.8mm and the number of teeth from 48 to 120.

The disadvantage of saws is that they have a small resource and require frequent regrinding of eubes, which with such a number of teeth is a very time-consuming process and especially for multi-saw devices.

Known circular saws with carbide inserts. (GOST 9769-79 "Circular saws with carbide inserts for processing wood materials). With the diameter of these saws from 400 to 560 mm, presented in GOST, their thickness ranges from 2.8 to 3 mm, and the number of teeth is in the range from 56 to 72. Such saws are more durable in operation and their regrinding is much less common. i

However, the soldering of carbide inserts and their sharpening with fine-tuning on a diamond tool requires expensive special equipment, as a result of which the operation of such saws is much more expensive than the previous counterpart. In addition, when sawing knobby wood with bark, in which various inclusions in the form of sand or other

B27B5 / 10 B27B5 / 14

abrasive inclusions, there are cases of chipping carbide plates, in view of their fragility, as a result of which they must be soldered.

Closest to the technical nature of the claimed design of the saw are circular saws with teeth welded with wear-resistant alloys, for example type "Stellite. (N.K. Yakunin Preparation for operation and operation of circular saws. Page 256 261. Ed. Mosgos. Forest University. Moscow 2000.) Only the ends of the saw teeth are surfaced.

The advantage of such saws is the saving of expensive wear-resistant materials, the high resistance of saw teeth, exceeding conventional saws 3 to 7 times or more for sawing various types of wood, eliminating the use of expensive diamond tools for sharpening teeth and the use of serial grinding equipment used for circular saws. Especially such saws have proven themselves in the primary sawing of wood with bark, since having high resistance they are at the same time not prone to chipping.

However, in view of the recent appearance of these saws on the sawmill market and the lack of proper research on the operation of saws with such wear-resistant saw materials, the standard sizes defined by GOST980-8O and GOST 9769-79 are used.

As a result, there is an irrational use of these saws when sawing various assortments, as well as an unjustified consumption of deposited wear-resistant material and an increase in the laboriousness of sharpening these saws due to the large number of teeth on the saws.

The authors carried out research and development work to determine the optimal design of a circular saw with deposited wear-resistant alloys such as “Stellite teeth, including the thickness of the saw

disc and number of teeth, taking into account the use of saws on the longitudinal sawing of coniferous wood with multi-sawing machines. The results of the work were successfully implemented in the prototype saws.

The purpose of the utility model is to create a new design of a circular saw equipped with teeth with wear-resistant alloys.

This goal is achieved due to the fact that in a circular saw with a diameter of 400 to 560 mm for longitudinal sawing of coniferous wood, preferably on multisaw machines, including a saw blade of thickness S with a cutting crown formed by an even number of teeth deposited with a wear-resistant Stellite alloy with the widening of the cutting crown on each side from 0.5 to 1.0 mm, the height of the teeth L 25 ± 5 mm, the angle of sharpness of the teeth p 40 ± 10 °, and the front angle at 35 ± 10 °, according to the utility model, the number of teeth Z of the saw and the thickness S saw blade determined by rate

Z - DS. .

/ 5 2 7 / 36- / 45

Where D is the outer diameter of the saw.

The essence of the utility model is illustrated by drawings, on which it is shown:

Figure 1 - saw blade;

Figure 2 - saw blade, side view of figure 1;

Figure 3 - remote element 1 of figure 1.

The circular saw (figure 1) is intended for longitudinal sawing of coniferous wood, preferably on multi-saw machines, since it is on these machines that replacing and regrinding saws is a very time-consuming process.

The saw diameter is selected in the range from 400 to 5b0mm in accordance with a number of saw diameters provided by GOST 9SOSO, as the most acceptable for longitudinal sawing of wood on multi-saw machines.

WEAR-RESISTANT alloy, for example, type “Stellite on a previously cut tooth tip with a broadening of the cutting crown on each side from 0.5 to 1.0 mm (figure 2).

In order to use the well-known and proven saw tooth profile (Fig. C) with a point angle P, rake angle y and tooth height h, these dimensions were chosen equal to (3 40 ± 10 °, in accordance with GOST 980-80, at 35 + 10 ° and L 25 ± 5 mm In addition, these dimensions allow the use of commercially available equipment for sharpening saw teeth.

Experimentally, taking into account various cutting, heating, deformation of saw blades and other factors, the optimal saw design was determined, in which the number of teeth Z and the thickness S of the saw blade are determined by the following relationship:

Z.: F,. and 3 f9-rSOfSS i

Where D is the outer diameter of the saw.

In practice, this dependence for saws in the range of diameters from 400 to 5 mm is expressed by the following values:

The design of the saws allows to obtain high purity of processing, stable operation of the saws, an increase in the working time between regrindings, the possibility of using a cheaper grinding tool and a reduction in operating costs. industries in the Kmrov region.

Claims (1)

Circular saw with a diameter of 400 to 560 mm for longitudinal sawing of coniferous wood, preferably on multisaw machines, including a saw blade of thickness S with a cutting crown formed by an even number of teeth deposited with a wear-resistant Stellite alloy with a widening of the cutting crown on each side from 0.5 to 1.0 mm, tooth height h = 25 ± 5 mm, tooth angle β = 40 ± 10 ^° , and rake angle γ = 35 ± 10 ^° , characterized in that the number of teeth Z of the saw and the thickness S of the saw blade determined by dependence

where D is the outer diameter of the saw.