JPS5881512A - Continuous drawing device - Google Patents

Abstract

PURPOSE:To stably cut a metallic material even in high speed drawing, by providing a means which temporarily restricts the end part of the material to the outer circumference of a drawing drum placed behind a cutter and makes downward force act on the material. CONSTITUTION:In a continuous drawing device of a metallic material 2, a part 41 of the lower end of a drum 4 is bent to the inside; a dog 7 and a cutter 8 are arranged on the extension line of said bend part, and a restricting means 9 and a dropping means 10 are also arranged on the extension line. When the material 2 is wound up around the outer circumference of the drum 4 to make the prescribed number of coils and pressed by a snubbing roll 5, the tip of the material 2 is cut off by the cutter 8 after actuating a cylinder 16 and an air nozzle 10 of the dropping means. In this case, a part of the material 2 leading to the cut off part is pressed to the drum 4 by a clamping piece 9 of the restricting means. Though the piece 9 returns after the actuation of cutter 8, a part leading to the tip of material 2 is pushed downward by a compressed air from the air nozzle 10 to surely drop into a tray 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in continuous drawing equipment for metallic phases, such as tubes, rods, strips, etc.

For example, for drawing small-diameter, thin-walled tubes, a drawing drum 4 is used, as shown in FIG. 1, which winds up the tube 2 that has been drawn through the die 1 and removes it from below. In this case, the tram 4 is provided with a Cj, a barb 7 that grips the tip of the tube 2, a cutter 8 that cuts off the tip, a shedder ring 3 that releases the winding ring of the tube, and a snubber roll 5 that presses the winding ring, #1. ing.

However, the lever device grips the date part at the tip of the tube 2 passed through the die 1 with the doda 7 to drive the doshino 4, and then a predetermined number of tube rings are wound around the outer circumference of the tram 4. At this time, the tip of the tube 2 is cut with a cutter 8, and the winding rings are successively dropped into a tray 6 arranged below.

This device theoretically has the advantage of being able to draw an infinite number of tubes, as well as being capable of drawing at high speed.

However, with this device, the tip must be cut at low speed. This is due to the fact that the part following the tip, which has been released from the binding force due to lino cutting, is lifted up due to the spring bank and centrifugal force, and may not enter the tray 6, or may be hit by the side part AA11, resulting in injury or deformation. This is due to things like that.

Lost time associated with low-speed operation becomes a greater problem as the length of the tube coil to be drawn becomes smaller.

The present invention has been made in view of the above-mentioned problems, and is intended to provide an improved device that can perform stable cutting even during high-speed drawing.

According to the present invention, as shown in FIG. This can be achieved by providing a means 10 for forcibly dropping the vicinity of the end of 2.

In this case, the restraint means 9 acts to reduce the springback force, and the drop means 10 acts to reduce the centrifugal force.

Therefore, it is desirable to operate these stages 5:± at the same time as or before the cutter 8 operates.

FIG. 2 shows an example of the restraining means 9 and the dropping means 10.

A portion 41 of the lower end of the drum 4 has a number of lifting platforms, which are curved inwardly, and on the extension line thereof, a 1.degree. guar and an O. cutter 8 are disposed. 9 and the dropping means 10 are arranged at this curved lower end 41.

The restraint means 9 guides the clamp piece 9 protruding from the hole 42 of the lower end 41, a cylinder 15 that operates the clamp piece 9 via the end fitting 12, and a cup and roller 16 provided in the middle of the clamp piece 9. It consists of a guide 14 with a groove 15. Therefore, when the pipe 2 is not clamped, the clamp piece 9 is in the position shown by the dashed line so as not to interfere with the start of winding, and when the pipe 2 needs to be cut, the cutter 8
Prior to the operation of the cutter 8, the cutter 8 descends at a position indicated by a solid line to press the tube 2 to the lower end 41, and returns after the cutter 8 is activated.

On the other hand, the dropping means 10 consists of an air nozzle connected to a compressed air source, and is disposed downwardly at the rear of the clamp piece 9 along the lower end 41, and like the clamp piece 9, the cutter 8 It operates to blow out compressed air prior to the operation of , and stops blowing out the compressed air after the clamp piece 9 returns.

The dropping means 10 may be another means, such as a mechanism that mechanically knocks down the end of the tube 2 or a mechanism that projects a downward guide.

To pull out the tube 2 in a device equipped with such a restraining means 9 and a dropping means 10, the tip of the tube 2 is kissed and the die 1 is pulled out.
Insert the date part of tube 20 protruding from die 1 into dog 7.
and immediately drive the extraction tram 4 at high speed.

When the tube 2 is wound a predetermined number of times around the outer periphery of the drawing drum 4, the snubber roll 5 presses the winding ring against the drum 4, and after operating the cylinder 16 and air nozzle 10, the cutter 8 is operated to remove the tube 2. Cut off the tip.

In this case, since the portion following the tip is pressed against the drum 4 by the clamp piece 9, it will not separate from the outer peripheral surface of the drum 4 even if springback force and centrifugal force act.

4- After the cutter 8 operates, the clamp piece 9 returns, so the part following the cut tip tries to lift up due to the spring force and centrifugal force, but the compressed air from the air nozzle 10 If the drum 4 is pushed downward, it will surely fall into the tray B disposed below even if it is only slightly separated from the outer peripheral surface of the drum 4, thereby preventing damage and deformation.

Incidentally, the speed of 1.ram 4 when cutting the mouth part conventionally was 80 m.
/mm, but with this idea: 450 m/m
I was able to implement it with m.

As is clear from the above explanation, this invention temporarily restrains the part following the tip that is cut off and applies a downward force to the core, so the drum can be moved at high speed from the start-up stage. Even if the cutting operation is performed during driving, the end of the lumber can be reliably dropped into the tray, and there is an advantage that high-quality drawn material can be efficiently obtained with less damage and deformation.

Similarly, in the previous explanation, a pipe was used as an example of the drawn material, but this may also be a rod, wire, strip, etc.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the device according to this invention;
FIG. 2 is an explanatory diagram showing details of the main parts. 1: Dice, 2: Metal material, 6: Shader ring, 4: Pulling drum, 5: Snahar roll, 6: Tray, 7: Dog, 8: Casota, 9: Clamp piece, 10: Air nozzle, 14 Guide, 16: Cylinder . 7- T 1 Orality 2 Diagram

Claims (1)

[Claims] 1. A drawing drum 4 that applies the necessary tension to the metal phase 2 drawn through the die 1, a barb 7 disposed on the outer peripheral surface of this drawing drum 4 and catching the end of the metal phase 2;
a snubber roll 5 disposed around the outer periphery of the pulling tram 4;
A cutter 8 disposed on the outer circumferential surface of the drawing tram for cutting near the end of the metal material 2, and a shedder ring 6 disposed above the drawing drum 4 for separating the drawn winding ring. , means 9 for temporarily restraining the vicinity of the end of the metal material 2 and means 10 for forcibly dropping the vicinity of the end of the metal material 2 are disposed on the outer peripheral surface of the tram 4 at the rear of the cutter 8. A continuous drawing device characterized by the following features: