JPH03184623A - Straightening method for drawing material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for straightening a drawn material such as a pipe or rod made of metal such as aluminum using a roll straightening machine, which has been drawn using a draw bench or the like.

Conventional technology Metal tubes such as aluminum tubes that require high precision in diameter, roundness, wall thickness, etc. are often manufactured by drawing extruded raw tubes. Pipes that have been drawn on a bench or the like often have some degree of bending due to uneven internal stress generated during the drawing process. For this reason, after drawing, it is common to undergo a straightening process in order to improve the straightness.

This straightening is carried out using a so-called inclined roll type straightening machine, in which the workpiece is fed from its tip in the direction of its own axis. By the action of the rolls placed in the workpiece, the workpiece is pulled in and straightened while being given a driven rotation.
This is generally carried out using a roll straightening machine that feeds the straightening machine forward.

Problems to be Solved by the Invention However, in the drawing process, a diameter-reduced mouth part is formed at one end of the raw pipe in advance, and the mouth part is passed through a drawing die, and the mouth part is placed in front of the die. It is pulled out by gripping the chuck of the carriage with the chuck and moving the carriage forward with a chain, etc. Dirt tends to concentrate particularly in the mouth part, and the basis weight can be reduced by biting by the chuck. Paris etc. occur in the part. Therefore, if the tube after being drawn is put into a roll straightening machine as it is, foreign matter such as dirt and AN debris will be brought into the roll straightening machine, and therefore, these foreign matters will get caught between the straightening roll and the drawn tube during roll straightening. There is a risk of damage to the outer surface of the drawn tube.

Therefore, in particular, drawn tubes support photoconductive photoreceptor layers, such as selenium or organic photoreceptors, in tubes where strict surface precision is required, e.g. in photoreceptor drums of electronic copiers, laser printers, etc., in particular. In the case of tubes used in the manufacture of products such as photosensitive drum substrates in which the surface quality is strictly controlled, the above-mentioned scratches become a fatal defect and reduce the manufacturing yield.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a method for straightening a drawn material by which the drawn material can be straightened by a roll straightening machine without damaging the drawn material.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a method in which, when straightening a drawn material using a roll straightening machine, the mouth part of the drawn material is cut out in advance by a press cutting method and then the above-mentioned correction is performed. This article summarizes the characteristic method for straightening drawn materials.

Operation In the above method, since the mouthpiece, which is the source of foreign matter, is cut out and the drawn material is straightened by the roll straightening machine, no foreign matter is brought into the roll straightening machine.

Moreover, since the cutting of the mouth part is carried out by a press cutting method, no chips are generated during cutting, and therefore such chips are not carried into the roll straightening machine.

Example Embodiments of the present invention will be described below based on the drawings.

In the method of this invention, when straightening a drawn material using a roll straightening machine, the mouth portion of the drawn material is cut out in advance by a press cutting method, and then the above-mentioned correction is performed.

First, the contents of the drawing process for drawing out the extruded raw pipe, the straightening process for straightening the drawn pipe, and the cutting and cutting process performed between the two processes will be explained.

The drawing process is performed using a draw bench (1), as shown in FIG. 1 (b). This draw bench (1
) is equipped with a drawing die (2) and a carriage (3) placed in front of the die and moved in the front and back direction by a chain (not shown). is passed through a die (2), the part having the same weight is gripped by a chuck (3a) of a carriage (3), and the carriage (3) is moved forward to be drawn out. In addition, (4) is a plug, and (5) is its support rod.

The straightening process is performed using a roll straightening machine (12), as shown in FIG. 1(d). This roll straightening machine (1
2) is the so-called inclined roll type straightening machine mentioned above;
That is, by charging the workpiece from its tip toward its own axis, the correction rolls (I3), which are provided inside and arranged in a plurality of slanted positions in the shape of a string or drum.
This is a type of straightening machine that straightens the work while drawing it in, applying driven rotation, and sending it forward.

Then, the cutting process is performed using a cut-off type press cutting device (7), as shown in FIG. 1(C). This cutting device (7) has a pair of front and rear molds (8).
A parting blade (9) that moves up and down is arranged between (8),
Insert the ends of the pipe material into both molds (8) (8) and insert the parting blade (
9), the pipe material can be cut without generating chips.

The method of the present invention is carried out as follows. That is, as shown in FIG. 1(a), an extruded raw pipe (16) having a diameter-reduced mouth part (15) at one end is prepared, and the basis weight is equal to the part (15). , as shown in FIG. 1(b), pass the drawing die (2) of the draw bench (1) from the rear through the die hole (2a), and insert the chuck (2) of the carriage (3).
At 3a), the mouth part engages the part (15), and the carriage (3) is moved forward to perform extraction.

Dirt is concentrated at the mouth part (15) of the tube (17) after being pulled out, and cracks are formed due to being caught by the chuck (3a). Therefore, before straightening the bend, the mouth part (1
5) Excision is performed. That is, as shown in Fig. 1 (c), the mouth of this drawn tube (17) is inserted into the mold (8) (8) by inserting the end of the part (15) side for a predetermined length. , cutting blade (
9) to cut and remove the area (15). Since the cutting is performed by the parting blade (9), no chips are generated. Thereafter, this drawn tube (I7) is put into the roll straightening machine (12) from one end thereof, and is straightened by the action of the internal straightening rolls (13). The drawn pipe (17) is fed into the roll straightening machine (12) after the mouth part (15) is cut off without generating chips, so dirt, A and C scraps, chips, etc. are removed. Foreign matter is not brought into the roll straightening machine (12), and therefore the drawn tube (17) is not scratched during straightening.

Effects of the Invention As described above, the method for straightening a drawn material of the present invention involves cutting out the part that is the source of foreign matter, and then straightening the curve of the drawn material using a roll straightening machine. Therefore, the drawn material can be straightened without being scratched due to such foreign matter.

Moreover, since the cutting of the mouth part is done by the press cutting method, no chips are generated during cutting, and therefore such chips are not brought into the roll straightening machine, making it easy to overcast. It becomes possible to straighten the drawn material without causing scratches caused by chips.

Therefore, according to the method of the present invention, it is possible to straighten drawn materials that require strict surface precision, such as drawn tubes used in the production of photosensitive drum substrates, etc., without causing scratches. Therefore, it is possible to improve the manufacturing yield.

[Brief explanation of drawings]

Figure 1 shows the manufacturing process of the drawn material of this invention.
The same figure (A) is a side view showing the extruded raw pipe, the same figure (B) is a partial cross-sectional side view showing the drawing process, and the same figure (C) is a partial cross-sectional side view showing the mouth part cutting process, the same figure (D) is a side view showing the straightening process. (1)...Draw bench, (7)...Press cutting device, (12)...Roll straightening machine, (16)...Extruded raw tube (material), (17)...Drawn tube (pultruded material). that's all

Claims (1)

[Claims] A method for straightening a drawn material, characterized in that, when the drawn material is straightened by a roll straightening machine, the mouth portion of the drawn material is cut out in advance by a press cutting method, and then the above-mentioned correction is performed.