JPH0312968B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for drawing pipes, rods, etc., and a magnetic chuck device used therein.

<Conventional techniques and their problems> Conventional methods for drawing pipes, rods, etc.
In general, swaging machines or hammer machines are often used, and the tips of tubes, rods, etc. are crushed or deformed in order to be pulled out. Therefore, pickling after drawing becomes difficult, and the deformed tip is cut off, resulting in loss of metal material.

Furthermore, conventionally used chuck devices for pipes, rods, etc., were generally complex in structure and large in order to securely grip the pipes, rods, etc. to be chucked under strong pressure. (Refer to Japanese Unexamined Patent Publication No. 1983-69205). In particular, chuck devices for pipes, rods, etc. used for drawing using dies require a large amount of power to pull the pipes, rods, etc. with great force.
The handling operation was troublesome.

The present invention has been made by focusing on such conventional technology, and provides a method for drawing pipes, rods, etc. without crushing or deforming the tip, and a magnetic method that has a simple structure and is easy to operate. The purpose is to provide a check device.

<Means for solving the problem> First invention (invention described in claim 1)
The method for drawing tubes, rods, etc., involves rotating a push pointer that holds the tube, rod, etc. to push out the tube, rod, etc., passing the tip of the tube, rod, etc. through a die, and passing it through the die. A method for drawing out tubes, rods, etc., in which the distal end thereof is pulled out using a magnetic chuck device, and the magnetic chuck device radiates a cylindrical body whose inner surface has a curved surface corresponding to the side surface of the tube, rod, etc. A chuck body is obtained by dividing the chuck body into two parts, and the chuck body is housed in a chuck holder which is formed with an outlet for a tube, a rod, etc., and the tube is inserted into the outlet of the chuck holder. The tip of a rod or the like is strongly pressed against the inner surface of each chuck constituting the chuck body, and the inner surface of each chuck is provided with a member having a large coefficient of friction, and the tube or rod formed by the chuck is provided with a member having a large coefficient of friction. Strong pressure with a rod or the like is achieved by the attractive force between the chucks that is generated when the facing surfaces of adjacent chucks become different magnetic poles when energized.

Second invention (invention stated in claim 2)
In the magnetic chuck device according to the above, a cylindrical body whose inner surface has a curved surface corresponding to the side surface of a tube, rod, etc. is divided in the radial direction to form the chuck body, and an insertion port for the tube, rod, etc. is formed. The chuck body is housed in a chuck holder, and the tip of a tube or rod inserted into the insertion opening of the chuck holder is strongly pressed by the inner surface of each chuck constituting the chuck body. The inner surface of the chuck is provided with a member having a large friction coefficient, and
The strong pressure exerted on the tube, rod, etc. by the chucks is achieved by the attractive force between the chucks, which is generated when the facing surfaces of the adjacent chucks become different magnetic poles when energized.

<Operation> Use the push pointer to pass the tip of the tube or rod through the die, perform a so-called "kiss," and then use the magnetic chuck device to grab and pull out the tip of the tube or rod that has the desired outer diameter. Therefore, there is no need to damage, deform, or crush the tips of tubes, rods, etc., making it difficult to pickle after drawing, and eliminating the possibility of cutting off the tips and causing material loss. (First invention).

In addition, the mutually opposing surfaces of the chucks that make up the chuck body are made into magnetic poles, and the attractive force between the chucks applies strong pressure to pipes, rods, etc., making the structure simple and easy to handle. You can grab pipes, sticks, etc. with one touch. In addition, a member with a high friction coefficient is provided on the inner surface of the chuck that comes into direct contact with pipes, rods, etc., so the tips of the pipes, rods, etc. will not be damaged, and the chuck will not come into contact with pipes, rods, etc. In particular, the strong pressure of the chuck during drawing or other processes effectively acts on the tube, rod, etc., and does not deform the tip of the tube, rod, etc. (second invention).

<Example> Hereinafter, a preferred example of the present invention (first invention and second invention) will be described based on FIGS. 1 to 3.

Reference numeral 1 indicates a metal pipe to be processed, and reference numeral 2 indicates a die for drawing. Reference numeral 3 denotes a push pointer, which is composed of two feed rods 3a, in which a strong pressure part (chucking part) 4 serving as the "tip" of a metal pipe 1 is connected to a die 2.
The metal pipe 1 is initially fed so that it passes through the

Reference numeral 6 designates a magnetic chuck device according to an embodiment of the second invention, which is composed of a chuck body 7 and a chuck holder 8 for housing the chuck body 7. The chuck main body 7 is composed of two semi-cylindrical chucks 9 and 10 formed by dividing a cylindrical body into two. , 10 has a curved surface corresponding to the side surface of the metal pipe 1 in order to ensure close contact with the metal pipe 1 to be drawn. Furthermore, opposing surfaces 13 and 14 of these two chucks 9 and 10, which are opposed to each other, are configured to become different magnetic poles when energized.

The chuck holder 8 has the chuck main body 7
An internal space for storing the metal pipe 1 is formed, and an insertion port 15 into which the metal pipe 1 is inserted is provided. The bottom part 16 of this chuck holder 8 is removable with a threaded part 17.
By removing this bottom portion 16, the chuck body 7 can be taken in and out of the chuck holder 8. Further, a screw shaft 18 is integrally erected on the bottom portion 16, and a cylindrical hard wooden core material 19 having an outer diameter corresponding to the inner diameter of the metal pipe 1 is attached to the screw shaft 18. There is. Furthermore, this chuck holder 8 can be moved horizontally in the pulling direction by means of a pulling wire 20 attached to the bottom portion 16.

Next, the operation of this magnetic chuck device 6 will be explained.

First, the strong pressure part 4 at the tip of the metal pipe 1 is passed through the die 2 by the initial feeding by the push pointer 3, and the so-called "kissing" of the metal pipe 1 is performed. High pressure part 4 of metal pipe 1 passed through die 2
The outer diameter of the push pointer 3 is the desired diameter, and when this kissing is completed, the push pointer 3 is removed from the metal pipe 1. Then, the strong pressure part 4 of the metal pipe 1 protruding from the die 2 to the other side is inserted into the insertion port 15 of the chuck holder 8 while inserting the wooden core material 19 inside it.

Then, the two chucks 9 and 10 are energized, respectively, and their opposing surfaces 13 and 14 are made into different magnetic poles. That is, the facing surface 13 of one chuck 9 is made into an N pole and an S pole, respectively, and the facing surface 14 of the other chuck 10 is made into an S pole and a N pole, respectively, so that the opposing surface 13 and the opposite polarities are opposite to each other. do. Then, the chucks 9 and 10 are attracted to each other, and the inner surface 11 of the chuck main body 7 contracts, applying strong pressure to the high-pressure portion 4 of the inserted metal pipe 1 so as to sandwich it between the top and bottom. At this time, since friction is effectively applied by the rubber sheet 12, which will be described later, there is no need to apply an unnecessarily strong force that would deform the strong pressure part 4. Since the wooden core material 19 is inserted into the housing, the high pressure portion 4 will not be crushed and deformed. Then, when the chuck holder 8 is horizontally moved in the pulling direction using the pulling wire 20, the metal pipe 1 is also pulled in that direction and the die 2 performs the drawing process. Also,
The rubber sheet 12 with a high friction coefficient on the inner surface 11 of the chucks 9 and 10 prevents the metal pipe 1 from slipping and coming off from the chuck body 7 during the drawing process, and allows the pulling operation by pulling the strong pressure from the chuck body 7. It acts effectively on Further, since the rubber sheet 12 is in contact with the high pressure portion 4 of the metal pipe 1, there is no chance of damaging the high pressure portion 4. The metal pipe 1 drawn in this way is removed from the magnetic chuck device 6 and subjected to pickling in the later process, but since the high-pressure part 4 is not crushed or deformed, the acidic liquid is removed. It becomes easier to pass through the inside of the metal pipe 1, and pickling can be performed in good condition.
Further, there is no need to cut off the strong pressure portion 4.

In addition, in the above explanation, two chucks 9 and 1
Although the chuck main body 7 is shown as an example in which the chuck body 7 is divided into two parts, the invention is not limited to this, and the cylinder body may be divided into three or four parts in the radial direction. Furthermore, although the embodiment has been described using the metal pipe (pipe) 1 as an example, a metal rod may also be used. Further, the material inserted into the strong pressure portion 4 is not limited to the wooden core material 19, but may be a cylindrical material made of plastic resin. Note that these core materials are not necessary when drawing the rod.

<Effects> The method for drawing pipes, rods, etc. according to the first invention has the content as described above, and
Since the tip of the tube or rod is passed through the die using the push pointer, so-called "kissing" can be easily performed, and the tip of the tube or rod, etc. has the outer diameter determined by "kissing" with the push pointer. Since the part is grabbed and pulled out using a magnetic chuck device, there is no need to deform or crush the tip of the tube or rod, and it is possible to perform pickling after the drawing process. There is no risk of material loss.

In addition, the magnetic chuck device according to the second invention strongly presses the pipe or rod by the attractive force generated between the chucks, which become electromagnets when energized, so that the structure is simple and the handling is easy. etc. can be grasped with one touch. Therefore, the preparation time for chucking can be shortened and work efficiency can be improved. In addition, a member with a high friction coefficient is provided on the inner surface of the chuck that directly contacts the pipe or rod, so the tip of the pipe or rod will not be damaged, and the chuck body will come into close contact with the pipe or rod. In particular, the strong pressure exerted by the chuck during drawing and other processes effectively acts on pipes, rods, and the like.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention (first invention and second invention), and FIG. 2 is a vertical cross-section of the magnetic chuck device shown in FIG. 1 along the axial direction. FIG. 3 is a cross-sectional view showing a cross-section perpendicular to the axial direction of the magnetic chuck device. 1... Metal pipe, 4... Strong pressure part (tip), 6
... Magnetic chuck device, 7... Chuck body, 8... Chuck holder, 9, 10... Chuck, 11... Inner surface, 12... Rubber sheet (member with large coefficient of friction), 13, 14... Opposing surface, 15... Insert mouth.

Claims (1)

[Claims] 1. Push out the tube, rod, etc. by rotating a push pointer that holds the tube, rod, etc., pass the tip of the tube, rod, etc. through a die, and pass the tip of the tube, rod, etc. through the die. A method for drawing pipes, rods, etc., which is gripped and pulled out using a magnetic chuck device. The chuck body is then housed in a chuck holder, which is formed with an insertion port for a tube, rod, etc. The tip is strongly pressed by the inner surface of each chuck constituting the chuck body, and the inner surface of each chuck is provided with a member having a large friction coefficient, and the chuck applies strong pressure to the tube, rod, etc. This is a method for drawing pipes, rods, etc., which is carried out using the attractive force between the chucks, which is generated when the opposing surfaces of adjacent chucks become different magnetic poles when energized. 2 A cylindrical body whose inner surface has a curved surface corresponding to the side surface of a pipe, rod, etc. is divided in the radial direction to form a chuck body,
Then, the chuck main body is housed in a chuck holder that has an insertion opening for a tube or rod, and the tip of the tube or rod inserted into the insertion opening of the chuck holder is inserted into the chuck. A strong pressure is exerted on the inner surface of each chuck constituting the main body, and the inner surface of each chuck is provided with a member having a large coefficient of friction, and the strong pressure applied by the chuck to the pipe, rod, etc. A magnetic chuck device characterized in that the magnetic chuck is operated by an attractive force between the chucks, which is generated when the opposing surfaces of the chucks that meet each other become different magnetic poles when energized.