SU1219275A2 - Method of producing elongated cold-rolled workpieces - Google Patents

Description

The invention relates to the blanking production of metallurgical and machine-building plants, can be used in industry for separating rolled square, round and polygonal profiles and is an improvement of the method for producing long cold-rolled billets according to ed. St. No. 1147522.

The purpose of the invention is to improve the quality of the resulting blanks.

FIG. 1 schematically shows the reversal of the rolled stock when introducing non-axially moving knives into it; in fig. 2 is a flow chart of the proposed method for producing blanks.

The method for producing long cold rolled products is carried out as follows.

The rod of the rolled steel 1 is fed into the working area of the cutting device between the blades 2 and 3 so that the supporting knife 2 flies to the rolled steel 1 at the moment when the scoring knife 3 remains to pass to the rolling surface 1 some distance determined by the mass characteristics of the movable parts of the cutting device that carry knives 2 and 3, the speed of movement of knives 2 and 3, their geometry and the mechanical properties of the rolled products. The supporting wedge knife 2, approaching the rental 1 with the initial velocity Vo, begins to penetrate into it, while losing its kinetic energy and acceleration of rolling 1. The acceleration developed in this case will depend on the resistance of the rolled steel 1 introducing the supporting wedge knife 2. Accelerated movement of the rolled product 1 will cause bending of the divided parts of the rolling product 1 by inertial forces, which can be defined as

 and, where a is the acceleration of the rolled stock 1;

M, gp-according to the mass of parts of rolled products.

The inertial forces Rin and Rin can be considered as a concentrated force applied respectively on the shoulder L and Jm, where Em and E 1 is half the length of the corresponding parts of the rolled product. At this time, MD, which turns the bar of rolling 1 due to the misalignment of knives 2 and 3, can be directed both against the inertial force PJH and against the force Rin, depending on the direction of choice of gaps in the connections and guides when moving knives 2 and 3. it follows that to compensate for the unwinding moment Md by the moment from inertial forces it is necessary that

MD RdnE "P" n m (when).

Subject to,

five

0

Esh t

where P is the penetration force of the knife;

D - arises in the process of cutting the misalignment of the knives;

gp is the mass of the smaller part of the rolled steel;

1, „- half the length of the part of the rolled product with mass w,

The barbed bar 1 is bent relative to the supporting knife 2, which leads to the appearance of 3 significant tensile stresses on the side of the scoring knife 3 in the layers of bar 1. The introduction of the scoring knife 3 into the stretched zone leads to the creation of a stress concentrator in it and the separation of the workpiece with high cut quality due to a high degree of symmetry of the stressed and deformed state relative to the separation plane. After separation of the bar of rolling 1, knives 2 and 3 return to their original position.

Rin ol-rn t

VNIIPI Order 1192/17 Circulation 1000 Subscription Branch of the PPP “Patent, Uzhgorod, ul. Project, 4

FIG. 2

Claims (1)

METHOD FOR PRODUCING LONG-DIMENSIONAL COOKINGS OF COLD RENTAL by ed. St. No. 1147522, characterized in that, in order to improve the quality of the obtained blanks, the acceleration and movement of the rental during the implementation of the support wedge knife into it is determined from the following expression a> £ -—, u m where P is the knife insertion force; A - misalignment of knives arising in the process of cutting; m is the mass of the smaller part of the rolled stock; t _m - half the length of the smallest of the parts of the rolled stock. Figure 1