RU2279953C1 - Device for cutting blanks of round cross-section - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: device comprises two flat knifes mounted in the guides for permitting simultaneous counter plane-parallel movement. Each knife has pressing plane, plane with cutting edge, and bearing edge. The pressing plane of one of the knifes from the front side and plane with the cutting edge of the mating knife are parallel to the bearing edges of the knifes. From the back side, the plane with the cutting edge of one of the knife and pressing plane of the mating knife are inclined in opposite directions at the same angle.

EFFECT: simplified servicing.

4 dwg

Description

The invention relates to the procurement of engineering and metallurgical enterprises, in particular to cutting devices.

A device for cutting round billets containing two flat knives installed in the guides with the possibility of simultaneous oncoming plane-parallel movement, the cutting edge of each knife is inclined to its opposite supporting edge at an acute angle, while the cutting edges of both knives are inclined to one side [1] .

The disadvantage of this device is the unsatisfactory quality of the cut surface when receiving dimensional blanks due to the open cutting scheme, limited possibilities along the length of the cut blanks. Another significant drawback is the shift of the feed rod upward at each cut relative to the separation plane. As a result, a bar, the length of which can be several meters, constantly rises above the surface of the feed roller table and loses its stability in the cutting zone. This, in turn, does not allow to obtain blanks with perpendicular ends and makes cutting blanks on this device impossible without the use of additional guide wires that hold the bar from free uncontrolled displacement relative to the cutting plane. As a result, the operation of such a device becomes quite difficult.

The closest in technical essence and the achieved effect to the present invention is a device for cutting billets of circular cross section, containing two flat knives installed in the rails with the possibility of simultaneous oncoming plane-parallel movement, each of which is made with a clamping plane, a plane with a cutting edge and a supporting edge [ 2].

This device implements an incompletely closed cutting scheme with an active transverse clamp, which allows to improve the quality of the cut surface of the cut workpieces and expand their length range. But at the same time, the problem noted above remains associated with the offset of the shared rod relative to the cutting plane, which is the reason for the complication of the operating conditions of the device.

The objective of the invention is to eliminate this drawback, namely, simplifying operating conditions by preventing the displacement of the rod relative to the cutting plane in the process of obtaining dimensional blanks from it.

The problem is achieved in that in the known device for cutting billets of circular cross section, containing two flat knives installed in the rails with the possibility of simultaneous oncoming plane-parallel movement, each of which is made with a clamping plane, a plane with a cutting edge and a supporting edge, according to the invention with a frontal the sides, the clamping plane of one knife and the plane with the cutting edge of the reciprocal knife are parallel to the supporting edges of the knives, and on the reverse side, the plane with the cut the common edge of one knife and the clamping plane of the reciprocal knife are inclined in the opposite direction at the same angle.

The fact that on the front side the clamping plane of one knife and the plane with the cutting edge of the reciprocating knife are parallel to the supporting edges of the knives, and on the back side, the plane with the cutting edge of one knife and the clamping plane of the reciprocating knife are made inclined in the opposite direction at the same angle to eliminate the offset of the cut the rod relative to the cutting plane, eliminate the need for additional guide wires that hold it from an arbitrary turn, and thereby simplify the machine's environment.

The invention is illustrated by drawings, where figure 1 shows a diagram of the device in the initial position from its front side, figure 2 - during the cutting process, figure 3 - view a in figure 1, figure 4 - section B- B figure 2.

A device for cutting round billets contains cylinders 1 and 2 of a hydraulic actuator (not shown conditionally), upper 3 and lower 4 knives moving respectively in guides 5, 6. On the front side, the pressing plane 7 of the upper knife 3 and the plane 8 with a cutting edge 9 of the lower the knife 4 are parallel to the supporting edges 10 of the knives 3, 4. On the reverse side of the upper knife 3, the plane 11 with the cutting edge 12 and the clamping plane 13 of the lower knife 4 are made inclined in the opposite direction at the same angle α. Between the pressing plane 7 of the upper knife 3 and the plane 8 of the lower knife 4, a bar 14 is shown, and between the inclined plane 11 of the upper knife 3 and the pressing plane 13 of the lower knife 4, a cut-off blank 15 is shown.

The device operates as follows.

The bar 14 is served at the required value in the gap between the knives 3, 4 from their front side. Then include a hydraulic actuator, which through cylinders 1, 2 reports the simultaneous oncoming movement of the knives 3, 4 along the guides 5 and 6, respectively. Moreover, the vertical distance between the planes 11 and 8 of the knives 3 and 4 with cutting edges 12 and 9 is reduced. The knives 3, 4, rotating the bar 14, are gradually introduced into it by the cutting edges 9, 12, up to the moment of separation of the cut workpiece 15. Moreover, the obliquely made clamping plane 13 of the knife 4 throughout the entire cutting process provides a rigid clamp of the cut workpiece 15, and the clamping the plane 7 of the knife 3 and the plane 8 of the knife 4, made parallel to the supporting edges 10, provide rotation and rigid clamping of the rod 14 without shifting its own axis relative to the cutting plane.

The proposed device was tested on a pilot installation when cutting a bar of different lengths from medium carbon steel with a diameter of up to 20 mm to obtain dimensional blanks.

The pump drive provided a working fluid pressure of up to 7 MPa. The inclined cutting edge of one and the pressing plane of the other knife responding to it had an angle of 17 degrees, and their length was 60 mm with a total length of the knives 110 mm, a width of 50 mm. The width of the planes of each of the knives is taken equal to half of the total width of the knife.

During operation of the device, there was no displacement of the rod relative to the separation plane during the cutting process, which ensured its stability in the cutting zone. There is no longer any need for additional guide wires for the cut bar.

The proposed device is expediently used in forge procurement of machine-building and metallurgical enterprises to perform separation operations.

Information sources

1. A.S. USSR No. 515598. A device for cutting round billets. B 23 D 15/02. Publ. BI No. 20, 05.30.76.

2. A.S. USSR No. 1355379. A device for cutting round billets. B 23 D 15/02. Publ. BI No. 44, 11.30.87.

Claims (1)

A device for cutting round billets, containing two flat knives mounted in rails with the possibility of simultaneous oncoming plane-parallel movement, each of which is made with a clamping plane, a plane with a cutting edge and a supporting edge, characterized in that the clamping plane of one knife is on the front side and the plane with the cutting edge of the reciprocating knife is parallel to the supporting edges of the knives, and on the reverse side, the plane with the cutting edge of one knife and the clamping plane of the reciprocal of the knife are inclined in the opposite direction at the same angle.

Images