JP4890237B2 - Roll straightening method for long tubular work - Google Patents

Description

  The present invention relates to a roll straightening method for correcting straightness, roundness, etc., of a long metal pipe such as an aluminum pipe, etc., and in particular, a work throwing method when feeding a tubular work toward a straightening machine It is about improvement.

  In this specification and the appended claims, the term “aluminum” is used to include aluminum and its alloys.

  As a base for a photosensitive drum of an electrophotographic apparatus such as a copying machine, a printer, or a facsimile, a drawn tube obtained by drawing an extruded aluminum tube material, so-called ED tube, is often used.

  For such an ED tube, for example, if there are minute irregularities on the surface, the defect shape is printed as it is or missing, and therefore, a special surface accuracy is strictly required.

  In addition, the ED tube is required to have extremely high dimensional accuracy as well as high surface quality. Among these dimensional accuracy, it is also strictly required that the straightness, that is, no undulation or bending in the axial direction.

For this reason, conventionally, a straightening process for straightening the long ED pipe after the extrusion process and the drawing process is generally performed (see Patent Documents 1 and 2 below). Then, the straightened tube material is cut into a predetermined size and manufactured on a photosensitive drum base.
Japanese Patent Laying-Open No. 2005-99774 (refer particularly to FIG. 12B) JP 2000-94036 A (see claims, FIGS. 1 and 2)

  The straightening processing of the long tubular material as described above is generally performed using a roll straightening machine (10) as shown in FIG. 7 attached to this document. The roll straightening machine (10) is arranged along a straightening pass line (L) of a long tubular work (P), and a plurality of pairs of drum-shaped straightening rolls (11) (12) each paired vertically. Have Then, the work piece tubular work (P) is made to pass through the entrance side positioning guide roll (13) in the pass line (L) between the upper and lower straightening rolls (11) and (12). Thus, the workpiece (P) is fed forward while applying its own axis rotation by the driving force of the correction rolls (11) and (12), during which required straightness correction and roundness correction are performed.

  In order to automatically feed the long tubular work (P) toward the straightening machine (10), a work feeding device (20) is provided adjacent to the back of the straightening machine (10). It has been.

  As shown in FIG. 7, the workpiece input device (20) includes a plurality of support rolls (21) spaced along an extension line of the correction pass line (L). Each of the support rolls (21) has a form called a V-type roll made of hard synthetic resin such as hard urethane, and supports and supports the tubular work (P) from below with a minimum contact area. In addition, it is supported by the lift drive cylinder (22) and can be lifted and lowered individually between a lift support position for supporting the tubular workpiece (P) and a lower retracted position. .

  A pushing member (23) for pushing the workpiece is mounted on the rear portion of the workpiece loading device (20) so as to face the correction pass line (L). The push member (23) has a front end fitting that has a trumpet shape that expands forward, for example, and the rear end of the tubular pipe (P) is received and supported by the front end fitting, It serves as a feeding mechanism that pushes the tubular pipe (P) forward over a predetermined distance range by a driving force such as a chain driving mechanism or a fluid pressure cylinder mechanism (not shown).

  By the way, when the straightening process of the long tubular work (P) is performed by the roll straightening machine (10) as described above, as shown in FIG. 8, all the support rolls (21) of the work loading device (20) are lifted and supported. Assuming that the tubular work (P) is thrown into the straightening machine (10) while maintaining the position, the tip of the tubular work (P) is the most entrance side of the many straightening rolls (11) (12). 1 When the straightening rolls (11a) and (12a) reach and begin to interfere with this, the tubular work (P) is rotated on its own axis, so that the outer peripheral surface of the tubular work (P) is supported by the support roll. (21) and the outer peripheral surface of the guide roll (13) may be rubbed violently and the outer peripheral surface of the tubular workpiece may be harmfully damaged.

  Therefore, conventionally, in order to avoid the occurrence of surface damage as described above, the tip of the tubular workpiece (P) reaches the position of the guide roller (13) for introduction positioning of the straightening machine (10), and the guide roll ( 13) When the tip of the workpiece can be supported by 13), all the support rolls (21) on the workpiece loading device (20) side are immediately lowered to the retracted position. For this reason, the tip and the rear end of the tubular work (P) are temporarily supported by the guide roll (13) and the rear end is supported by the pushing member (23) temporarily before the start of correction. The state where it was supported in two places of was produced.

  When the length of the tubular work (P) is relatively short, or the pipe diameter or thickness is relatively large and the work has sufficient bending rigidity over the entire length, the above-mentioned Even with such a conventional processing method, it has been possible to perform correction processing without causing a scratch on the surface of the workpiece.

  However, a tube material such as an aluminum ED tube used for a photosensitive drum substrate or the like is relatively thin and thin with an outer diameter of about 22 to 35 mm and a wall thickness of 1.0 mm or less. Supporting the loading device (20) immediately before loading the workpiece into the straightening machine (10), because the longer ones with an overall length of nearly 10m tend to be used for straightening to improve efficiency. With the conventional method of lowering all the rolls (22), it has become impossible to perform smooth and good correction processing.

  This malfunction phenomenon is shown in a slightly exaggerated manner in FIG.

  As shown in FIG. 9, after the tip of the tubular work (P) reaches the guide roll (13) for positioning of the straightening machine (10), all the support rolls (21) of the work loading device (20) are obtained. Since the workpiece (P) is supported only at the two positions of the front end and the rear end as described above, the intermediate portion of the workpiece is moved downward by its own weight immediately after the support roll (12) is lowered. After sagging and bent into a state of being greatly curved downward as a whole, it subsequently bends upward, resulting in significant vibration. When the tip of the work (P) reaches the first straightening rolls (11a) and (12a) on the entry side of the straightening machine (10) while the bending vibration is generated, the tip of the work (P) becomes a normal straightening path. Since it will be forced out between the upper and lower first straightening rolls (11a) and (12a) off the line (L), it will violently hit the peripheral surface of the straightening rolls (11) and (12), and in extreme cases it will be straightened. There may even be a situation where the roll (11) (12) is not properly introduced. In addition, since the vibration of the workpiece (P) as described above continues for a while after being introduced into the straightening machine (10), the outer peripheral surface of the workpiece (P) is sequentially moved to the straightening rolls (11) (12). It hits the shoulders of the body violently and causes surface damage. Furthermore, when the tip of the workpiece (P) is severely damaged by the collision with the correction rolls (11) and (12), minute fragments (aluminum debris) from the workpiece (P) are generated. There was also a problem of causing damage to the surface of the workpiece during processing.

  In view of the problems of the prior art as described above, the present invention can perform smooth introduction of a work into a straightening machine even when performing roll straightening processing on a long, relatively thin aluminum tube as a work, and thus accuracy. It aims at providing the processing method which can implement | achieve good correction processing.

  More specifically, there is a method for throwing a workpiece into the straightening machine that restricts the movement of the workpiece immediately before loading the workpiece into the roll straightening machine to only the movement in the loading direction and makes other movements minimal. The purpose is to present.

  The present invention provides the following means for solving the above problems.

[1] When feeding the long tubular work placed on the support roller group of the work feeding device toward the roll straightening machine while capturing the rear end with the pushing member,
From the time when the leading edge of the workpiece reaches the position of the guide roll for introduction positioning provided on the entry side of the straightening machine until the leading edge of the workpiece reaches the first straightening roll of the straightening machine, By leaving only one of the intermediate support rolls at the support position and lowering the other support rolls to the retracted position, the intermediate part of the workpiece can be supported by the intermediate support roll at the support position,
Then, after the tip of the work reaches the first straightening roll of the straightening machine, the intermediate support roll is slowly lowered from the support position toward the retracted position.

[2] The front support roll closest to the straightening machine in the support roll group is moved up to the support position after the tip of the work has passed thereabove in the lowered and retracted position to support the work.
Next, the roll straightening method for a long tubular work according to the preceding item [1], wherein the work tip is lowered again to the retracted position after the work leading edge reaches the position of the introduction positioning guide roll.

[3] A first step of holding the leading support roll closest to the straightening machine in the support roll group of the workpiece loading device in the lowered retreat position and holding all the other support rolls in the raised support position;
A second step of placing a long tubular work on the intermediate support roll and the rear support roll in the support roll group;
A third step of starting feeding toward the roll straightening machine while capturing the rear end of the workpiece with the pushing member;
A fourth step of raising the leading support roll to a support position after the tip of the work has passed over the leading support roll;
After the tip of the workpiece reaches the guide roll for introducing and positioning the straightening machine, the top support roll is lowered, and only one of the intermediate support rolls is left in the support position, and all the other support rolls are held in the retracted position. And a fifth step in which the work is supported at three locations by the guide roll, one intermediate support roll and the pushing member;
At the same time that the leading edge of the workpiece reaches the first straightening roll of the straightening machine and the straightening operation is started, the introduction positioning guide roll is lowered and the intermediate support roll at the support position is slowly lowered. And a roll straightening method for a long tubular work.
[4] Lowering of the intermediate support roll, which is lowered after the tip of the work reaches the first straightening roll of the straightening machine, suppresses the occurrence of turbulent vibration due to bending immediately after the work straightening operation starts. The roll straightening method for a long tubular work according to any one of [2] to [3] above, which is carried out by setting the speed as possible.

  [5] The method for correcting a roll of a long tubular work according to any one of [1] to [4], wherein the long tubular work is an aluminum drawn tube material.

  According to the workpiece straightening method described in [1] above, the work is actually performed immediately before the start of straightening by the straightening machine, that is, after the tip of the work is on the guide roll for positioning to the first straightening roll. Until reaching the 1 straightening roll, the workpiece is supported by the middle support roll, the tip is supported by the guide roller, and the rear end is supported by the pushing member. Supported on the correction pass line in the state. Accordingly, at this stage, even a long workpiece does not cause excessive downward bending. As a result, there is almost no vertical vibration of the workpiece due to bending. Then, when the tip of the workpiece often enters between the first correction rolls and the correction is started, the intermediate support roll that has been supporting the intermediate portion of the workpiece is also lowered toward the retracted position. Therefore, even if circumferential rotation is imparted to the workpiece due to the start of correction, the outer peripheral surface of the workpiece is not strongly rubbed against the intermediate support roll, and surface damage based on the friction occurs. There is no. Moreover, the intermediate support roll is lowered at a slow speed after the correction starts. Therefore, even if a force is generated to cause a vibration phenomenon on the workpiece when the workpiece starts to rotate with the start of correction, the intermediate support roll functions as a pressing roller that suppresses the occurrence of this vibration for a while. It does not cause harmful vibrations, that is, so-called workpiece rampage. Then, until the rotational speed of the workpiece increases and stable rotation with the pass line as the axis is realized, the intermediate support roll is already completely separated from the workpiece and lowered to the retracted position. There is no risk of scratching due to contact with the roll.

  As described above, the long tubular work is restricted to the minimum movement in the direction other than the movement in the loading direction immediately before being put into the straightening machine, and the contact with other members is minimized. Therefore, smooth correction processing can be performed without damaging the work surface.

  Further, according to the straightening method described in the above item [2], the top support roll in the support roll group rises after the tip of the tubular work passes above and supports the work from below. It has been made. Therefore, the leading edge of the workpiece does not come into contact with the leading support roll, and there is no possibility of damaging the leading support roll due to a slight uneven relative height. In addition, contaminants adhering to the tip of the tubular workpiece when it is transferred onto the workpiece loading device, that is, drawing oil or chips adhering to the tip of the workpiece in the preceding drawing process, etc. As a result, oil does not spread on the outer peripheral surface of the workpiece, resulting in poor pushing into the straightening machine, which is a concern when oil adheres to the workpiece surface. Nor.

  Next, the straightening method described in the above item [3] limits all the most suitable steps of the workpiece support procedure when the workpiece straightening machine is put in. The above items [1] and [2] The effect of each method of the above item can be realized and enjoyed regretfully.

  In addition, the processing method described in [4] can surely realize the effect of the item [1].

  Furthermore, the processing method described in the above item [5] can be suitably used for producing an aluminum substrate for a photosensitive drum of an electrophotographic apparatus.

  Next, a preferred embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a process step diagram for explaining the support state of the workpiece immediately before the workpiece is put into the straightening machine according to the present invention. 2-6 is a schematic side view which shows the workpiece support state at the time of each step in order of a process.

  The configurations of the roll straightening machine (10) and the workpiece loading device (20) for carrying out the present invention are the same as those of the conventional one. Therefore, in FIGS. 2 to 6, the symbols and the like shown in FIGS. 7 to 9 are used as they are, and the description of the specific device configuration is omitted.

  The first step (S1) at the beginning of the main procedure in the method for correcting a long tubular workpiece (P) according to the present invention is a workpiece input preparation step (standby step) as shown in FIG. In this preparation process, only the leading support roll (21A) closest to the straightening machine (10) in the support roll (21) group of the workpiece loading device (20) is held at the lowered retreat position, and all other support rolls (21B), (21C) and (21D) are all on standby at the upper support position corresponding to the correction pass line (L). In addition, the work introduction positioning guide roll (13) provided on the entrance side of the roll straightening machine (10) is also held at a regular support position. The guide roll (13) is a suspension type, and is suspended by an elevating cylinder (14) so as to be movable up and down, and supports the workpiece (P) at a raised position as opposed to the support roll (21). Retreats below the work (P) at the lowered position.

  Next, the second step (S2) is a process in which the long tubular workpiece (P) to be straightened is gently placed on the transfer line of the workpiece loading device (20). That is, the long tubular workpieces (P) that have been drawn are picked up one by one from the pool station by the transfer device, and placed on the support roll (21) group of the workpiece loading device (20). It is a process. At this time, the workpiece (P) is positioned between the leading support roll (21A) and the front intermediate support roll (21B) adjacent thereto, so that the intermediate support rolls (21B) (21C) are located. And a rear support roll (21D).

  Subsequently, in the third step (S3), the actual throwing operation of the tubular workpiece (P) is often started. That is. As shown in FIG. 2, the rear end of the work (P) is captured by the trumpet-shaped tip fitting of the pushing member (23) moving forward from behind, and the pushing member (23) advances as it is. As a result, it is pushed forward.

  In the fourth step (S4), when the tip of the tubular work (P) passes above the top support roll (21A) at the retracted position, the passage is detected by the sensor, and immediately after that, the top support roll ( 21A) starts to rise, and as shown in FIG. 3, the tubular work (P) reaches the rising support position until the tip of the tubular work (P) reaches the introduction positioning guide roll (13) of the straightening machine (10). Support P). Therefore, the tip of the workpiece (P) does not contact the leading support roll (21A), and the leading edge does not contact the peripheral surface of the leading support roll (21A) and damage the roll. When the leading support roll (21A) is contaminated by the drawing oil or the like, it is spread on the peripheral surface of the work (P), resulting in slipping between the straightening rolls (11) and (12). Although the introduction of the workpiece into the straightening machine (10) may not be carried out smoothly or there may be adverse effects such as hindering the straightening action, the leading support roll (21A) is not suitable for the workpiece (P) as described above. Since it does not come into contact with the tip of the oil, it is not contaminated with contaminants such as drawn oil adhering to the tip, and the concern that the above-mentioned problems occur can be eliminated. Further, as the push member (23) advances, the support rolls that may interfere with the push member itself are sequentially moved downward from the rear as shown in FIGS. Avoided.

  Next, as shown in FIG. 4, the tip of the tubular work (P) reaches the position of the work introduction positioning guide roll (13) provided on the entry side of the straightening machine (10), so that the fifth step ( Enter S5). That is, the workpiece (P) is subjected to the necessary cleaning immediately before the tip of the workpiece (P) enters the straightening machine (10), and then the workpiece introduction positioning guide roll (13) provided on the entry side of the straightening machine (10). When the upper position is reached, the fifth step (S5) is subsequently entered, and the leading support roll (21A) begins to descend immediately as shown in FIG. At this time, only one intermediate support roll (21B) located in the middle part in the longitudinal direction of the workpiece (P), preferably in the center part, is kept in the ascending support position as it is, and all the other support rolls (21A) ) (21C) (21D) are all kept in the lowered retreat position. Therefore, as shown in FIG. 5, the long tubular roll (P) is supported at the tip by the suspension type guide roll (13), and at the middle by the one intermediate support roll (21B). Then, the rear end is supported and supported by the pushing member (23) at three places, both ends and the intermediate portion.

  For this reason, the workpiece (P) is kept in a substantially straight state on the correction balance line (L) without causing a large downward deflection due to its own weight, without causing a flexural vibration, It is transferred to the straightening machine (10). The guide roll (13) is set to a height that can maintain a slight clearance with the lower surface of the work (P) when the tip of the work (P) reaches, and the front support roll (21A) Only when lowered, the tip of the workpiece (P) can be supported and supported.

  Subsequently, when the tip of the work (P) reaches the first first straightening roll (11a) (12a) in the straightening roll (11) (12) group in the straightening machine (10), substantial correction is started. The sixth step (S6) is entered. Immediately before entering the sixth step (S6), the top and bottom first straightening rolls (11a) and (12a) are obtained because the tip of the work (P) is supported by the guide roll (13) at the nearest position. It is introduced in a state of being accurately positioned between. And when the front-end | tip of a workpiece | work (P) is introduced between the 1st correction | amendment rolls (11a) (12a) in this way, the follow-up rotation of a self-axis center will arise in a workpiece | work (P) by the rotational drive of this correction | amendment roll. Therefore, as soon as the self-axis rotation of the work (P) starts, the guide roll (13) descends as shown in FIG. 6 and is separated from the work (P) to avoid friction with the peripheral surface. . At the same time, the intermediate support roll (21B) that has supported the intermediate portion of the workpiece (P) until then starts to descend at a slow speed. In addition to the purpose of avoiding contact friction with the workpiece (P) as well as the guide roll (13), this downward movement has an even more important purpose of causing the workpiece (P) to vibrate due to bending. It is to suppress the occurrence. For this reason, the lowering of the intermediate support roll (21B) is performed at a slow and slow speed particularly in the initial stage, and immediately after the start of the correction operation of the workpiece (P), the workpiece is subjected to the violent vibration due to the bending. It can be suppressed from occurring.

  When the tip of the workpiece (P) is introduced into the first straightening rolls (11a) and (12a) of the straightening machine (10) in this way, the workpiece (P) is sequentially moved to the subsequent straightening rolls (11) ( It is automatically drawn into 12), passes through a large number of correction rolls, is corrected to a straight state, and is sent out to the workpiece receiving conveyor.

  According to a preferred embodiment as described above, a roll straightening experiment of a long tubular work (diameter: 24 mm, length: 9.0 m) was performed, and the conventional work feeding method shown in FIG. Compared to the case of machining, the occurrence rate of defective products due to dents or scratches on the surface of the workpiece or significant harmful deformation at the tip of the workpiece could be reduced by about 6%. .

FIG. 4 is a process step diagram according to a preferred embodiment of the present invention. It is a schematic example drawing which shows the workpiece | work support state at the time of the 1st-3rd step. It is a schematic example drawing which shows the workpiece | work support state at the time of a 4th step. It is a schematic example drawing which shows the workpiece | work support state in the initial stage of a 5th step. It is a schematic example drawing which shows the workpiece | work support state in the latter half time of a 5th step. It is a schematic example drawing which shows the workpiece | work support state at the time of a 6th step. It is a side view which shows the outline | summary of a structure of the roll straightening machine and the workpiece | work input device arrange | positioned behind it. It is a side view which shows the input operation state of the improper workpiece | work which is easy to cause damage to a workpiece | work. It is a side view which shows the input operation state of the other improper workpiece | work which is easy to produce damage to a workpiece | work.

Explanation of symbols

10 ... Roll straightening machine 11 ... Straightening roll (upper side)
11a ... 1st correction roll (upper side)
12 ... Straightening roll (lower side)
12a ... 1st correction roll (lower side)
DESCRIPTION OF SYMBOLS 13 ... Guide roll 14 for workpiece introduction positioning ... Cylinder 20 ... Work input device 21A ... Leading support roll 21B, 21C ... Intermediate support roll 21D ... Rear support roll 22 ... Lifting drive cylinder 23 ... Pushing member P ... Tubular work L ... Straightening pass line

Claims (5)

When feeding the long tubular work placed on the support roller group of the work input device toward the roll straightening machine while capturing the rear end with the pushing member,
From the time when the leading edge of the workpiece reaches the position of the guide roll for introduction positioning provided on the entry side of the straightening machine until the leading edge of the workpiece reaches the first straightening roll of the straightening machine, By leaving only one of the intermediate support rolls at the support position and lowering the other support rolls to the retracted position, the intermediate part of the workpiece can be supported by the intermediate support roll at the support position,
Then, after the tip of the work reaches the first straightening roll of the straightening machine, the intermediate support roll is slowly lowered from the support position toward the retracted position. The leading support roll closest to the straightening machine in the support roll group is supported at the descending and retracting position, after the tip of the workpiece has passed therethrough, to the support position.
2. The method for straightening a roll of a long tubular workpiece according to claim 1, wherein the tip of the workpiece descends to the retracted position again after reaching the position of the introduction positioning guide roll. A first step of holding the leading support roll closest to the straightening machine in the support roll group of the workpiece loading device in the lowered retreat position and holding all the other support rolls in the raised support position;
A second step of placing a long tubular work on the intermediate support roll and the rear support roll in the support roll group;
A third step of starting feeding toward the roll straightening machine while capturing the rear end of the workpiece with the pushing member;
A fourth step of raising the leading support roll to a support position after the tip of the work has passed over the leading support roll;
After the tip of the workpiece reaches the guide roll for introducing and positioning the straightening machine, the top support roll is lowered, and only one of the intermediate support rolls is left in the support position, and all the other support rolls are held in the retracted position. And a fifth step in which the work is supported at three locations by the guide roll, one intermediate support roll and the pushing member;
At the same time that the leading edge of the workpiece reaches the first straightening roll of the straightening machine and the straightening operation is started, the introduction positioning guide roll is lowered and the intermediate support roll at the support position is slowly lowered. And a roll straightening method for a long tubular work.   The lowering of the intermediate support roll that is lowered after the tip of the work reaches the first straightening roll of the straightening machine can suppress the occurrence of violent vibration due to bending in the work immediately after the start of the straightening operation of the work. The roll straightening method for a long tubular work according to any one of claims 2 to 3, wherein the roll is set at a moderate speed.   The method for straightening a roll of a long tubular work according to any one of claims 1 to 4, wherein the long tubular work is an aluminum drawn tube material.

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