SU385728A1 - METHOD OF CUTTING PLASTIC MATERIALS - Google Patents

Description

one

The invention relates to the production of construction products from cellular concrete.

There is a known method of cutting plastic materials by cutting with a tension string. However, such a method for obtaining a clean and smooth cutting surface requires the use of a special wire with a periodic profile as a string.

The purpose of the invention is to reduce the roughness of the cut surface.

This is achieved by the fact that the supply of, for example, raw material, is carried out with a relative instantaneous speed proportional to the absolute value of the instantaneous speed of the saw and its strings along its axis.

FIG. Figure 1 shows a scheme for cutting plastic materials with a tension string; in fig. 2 is a graph of sawn blade speed and VHOR feed rate.

The cutting array 1 (see Fig. 1) is located during cutting on pallet 2, which is provided with grooves mainly in the cutting planes. Cutting is performed by lowering the frame 3 at the speed of the Upod while simultaneously moving the strings 4 at the instantaneous speed of the USHS. The strings 4 are stretched between the cables or the disks 5 mounted on frame 3 (sawn and feed drives are not shown in the drawing).

The proposed method of cutting speed

submission of UPOD - propordial to the absolute value of the instantaneous rate of sawing,

which can be expressed by the formula Y o K / Wickle,

where k is a constant coefficient. The proposed method allows to improve the quality. According to a known method, the surface areas, during cutting of which, the speed of sawing is equal to or close to zero, is more rough than the rest of the surface. This is because when the speed of the string is slowed down, the feed continues at a constant speed and the surface becomes rougher. When cutting on the proposed

In this way, such areas are excluded, since the speed of sawing and feeding is zero at the same time, i.e., when the string is stopped, the feeding is also stopped.

It should be noted that the position of the cutting

strings in space can be anything, not just horizontal (as shown in the drawing). The feed rate may not be reported to the cutting frame, but to the cut array. It is also possible to decompose the feed motion into two components. For example, the array being cut is said to move at a constant speed, and the cutting strings, in addition to sawnwood, also reciprocate in the direction of

filing in such a way that at their request the variable feed rate is variable (see Fig. 2).

Subject invention

Method of cutting plastic materials, for example, raw cellular concrete, taut

a string, characterized in that, in order to reduce the roughness of the cut surface, the supply of, for example, raw material is carried out with a relative A1 instantaneous speed proportional to the absolute instantaneous velocity of the saw string along its axis.

2fPuZ 1

st t

Phi2 2