SU885044A1 - Method of making articles with projecting surface elements - Google Patents

Description

(54) METHOD OF MANUFACTURING PRODUCTS WITH SPEAKING ELEMENTS ON THE SURFACE

I

The invention relates to woodworking and can be used in production. structure of products with a uniform density across the section, as well as in the production of chipboard.

A known method of manufacturing products with protruding elements, including the preparation of a press mass, the molding of blanks, prepressing, hot pressing 1.

Limes A method of manufacturing products with protruding elements on the surface, which includes the preparation of a wood-adhesive composition, the molding of a blank in a cold press, and hot pressing 2.

The disadvantages of the known methods are low productivity and quality of products.

The purpose of the invention is to increase productivity and improve the quality of products.

LI.

This goal is achieved by the fact that during the molding of the preform, the punch and the cold press die are vibrated at a frequency of 10-40 Hz and an amplitude of 0.1-2 mm for 10-30 seconds with increasing pressure from 0 to 40 MPa.

Example I. The formation of briquette of variable thickness.

A portion of the woody press mass fall asleep in a metal matrix. On top of the wood press mass impose a punch having hollows and protrusions velchn55 oi 5 mm. The mold is placed in a hydraulic pulse vibropress with a pneumatic loading device. The vibration source is a pulsator valve. The duration of the oscillations is 10 s, the frequency .. of the oscillations is 30 Hz, the amplitude of the oscillations is 2 mm, the punch pressure is 0.5 MG1a.

The pressed extrusion machine is pressed in a hot compression mold at 160 ° C. The finished product is cut into samples n test. in accordance with GOST 10632-77.

15

Example 2. Forming a briquette with voids.

The wood press mass is formed between the die and the punch having protrusions of a size equal to the thickness of the briquette in

20 pressed condition. The punch tabs are made of an elastic material, such as rubber, in order to prevent damage to the matrix, TjaK as if formed by vibrating Nuanson, an air-pressure mass, is lowered onto the matrix. The briquette forming mode is as follows:

Oscillation frequency

10-40 Hz Oscillation amplitude О, i -1,0mm Time of exposure

1/5 pulse period

Pressure 0.1 -1, OPS

In the process of forming the briquette, the pressure increases from the lower limit to the upper. In this case, the oscillation frequency increases, and the amplitude decreases. Samples were obtained with a density of 600 kg / m.

Example 3. Forming simultaneously with pressing.

Wood press mass is placed between the heated die and punch. At a pressure of 0.1 MPa, it is shaved for 10 seconds (oscillation frequency 15 Hz. Amplitude 1.5 mm) then increase the pressure to 1.5 MPa and frequency to 30 Hz and reduce the amplitude to 0.2 mm. With these parameters, incubated for 120 s. Compressed material is obtained, the flexural strength of which is 23 MPa, and the tensile strength of 0.5 MPa.

The use of the proposed method in comparison with the known methods provides a reduction in the specific pressure during the formation of blanks but less than 2 times. As well as simplifying other equipment, for example, devices for filling compressed material, this reduces equipment costs by about

20%. Reducing the duration of the technological cycle of forming blanks will shorten the cycle of manufacturing the product by 10-15%. In addition, this will allow the use of more high-performance press equipment. As a result, a large economic effect can be obtained from using the proposed method of making articles from wood-glue composition.

Claims (2)

1.Shvartsman GM Production of chipboard. M., Publishing house "Lesna industry, 1977, p. 268-270. 2. USSR author's certificate No. 203887, cl. At 29 J 5/00, 1966.