RU1791111C - Method of producing timber blanks - Google Patents

Abstract

Use: in cutting shops of woodworking enterprises. SUMMARY OF THE INVENTION: a method for producing workpieces includes drying lumber, marking their parts with a weakened cross-section and removing these parts while cutting lumber into workpieces. Marking parts of sawn timber with a weakened cross-section is carried out before drying. 3 ill.

Description

The invention relates to the woodworking industry, in particular to methods for cutting lumber into blanks and can be used in cutting shops of woodworking enterprises.

The purpose of the method is to increase the yield of blanks and improve their strength characteristics by improving the quality of lumber.

In FIG. 1 shows a board having defects (knots); in FIG. 2 - a board with marks made by drilling knots not allowed in the blanks; in Fig. 3 is a diagram of an individual cutting of the board into the required blanks with simultaneous removal of the marked section of the board with a weakened section.

The proposed method for producing blanks is carried out as follows. From lumber 1 (board length m, thickness mm, width mm; see Fig. 1), having knots: 2 - with a diameter of 13 mm, 3 - with a diameter of 40 mm, 4 - with a diameter of 25 mm, 5 - with a diameter of 10 mm, 6 - with a diameter of 35 mm, it is required to produce blanks of the second quality group with a length of mm.

For the second high-quality group of blanks, knots greater than 1/3 of the width are unacceptable

boards (GOST 9685-61), i.e. knots with a diameter of more than 33 mm. For lumber 1, knots 3 are not permissible - with a diameter of 40 mm and b - with a diameter of 35 mm. Holes 7, 8 are made on the board surface, drilling knots 3 and 6. Holes are made by drilling on automatic machines for sealing knots with corks, for example, on a model of the SVSA-2 model. The diameter of the drilled holes is not less than the diameter of the knot that is not allowed in the workpieces (see Fig. 2). The holes serve as marks for the operator and can significantly facilitate his work, since they do not require time to determine the size of the knot. Then, lumber with holes 7, 8 (see Fig. 2) is sent for drying. Drying is carried out in drying chambers of any type, for example, in chambers of the TsNIIMOD design. After drying, the sawn timber arrives at the cutting section, where on the trimming machine, for example, on the model TsPA-40 machine, the operator removes parts of the board 9, 10 with a weakened cross-section as a result of marking and parts of the board 11, 12 containing an unacceptable defect in the blanks - cracks, formed as a result of drying lumber. At the same time, the operator cuts lumber 1 into blanks 13, 14, 15 of the required length AND 1500 mm each (see, Fig. 3).

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Thus, from lumber 1, three billets 13, 14, 15 and segments were obtained: 16 - 450 mm long and 17 - 475 mm long. Sections 16 and 17 have a length of more than 300 mm and are suitable for the production of glued blanks. Therefore, they are sent to the gluing site, and subsequently cut into blanks.

Using the proposed method for producing billets from lumber provides significant advantages compared to existing methods: removing the knot and part of the knot zone before drying the lumber allows you to remove the potential zone of stress concentration that occurs during drying in the knot zone, which partially prevents warping lumber when drying; hole marks are more reliable than any dyes for both the operator and the automation of the process of cutting parts of sawn timber with a weakened cross section;

such marks can significantly facilitate the work of the operator, as do not require time for determining the size of the knot; when planing lumber with holes in the place of knots, the quality of the planed surface will be higher and tool wear will be reduced.

Claims (1)

SUMMARY OF THE INVENTION A method for producing blanks from lumber, including drying, marking parts of sawn timber with a weakened cross-section and removing them while cutting them into blanks, characterized in that that, in order to increase the yield of workpieces and improve quality by improving strength characteristics, parts of sawn timber with a weakened cross-section are marked before drying, and the marks are made in the form of through holes at the locations of defects that are not allowed in the workpieces.