JP4964580B2 - Drawing method - Google Patents

Description

  The present invention relates to a drawing method for drawing a pipe material such as an aluminum pipe through a drawing die and related technology.

  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.

As shown in Patent Documents 1 and 2, the conventional drawing method is such that an aluminum tube in which a plug rod provided with a drawing plug at the tip is inserted is inserted through a machining gap between the drawing die and the drawing plug. ing.
JP-A-9-29324 (Claims, FIG. 1) JP-A-5-253611 (Claims, FIG. 1)

  In the recent drawing technology, the length of the drawn tube has been increased to improve productivity. As a matter of course, if the drawn length is increased, an aluminum tube as a pipe material (element tube) or In addition, the dimension of the plug rod disposed in the interior of the plug rod also becomes longer. However, when the plug rod becomes long, vibration is likely to occur in the plug rod, and the vibration of the pull-out plug at the tip of the rod is caused by the vibration, and a minute uneven portion is formed on the surface of the pull-out tube. In particular, the drawing tube used as the photosensitive drum base is required to have extremely high surface quality as well as high dimensional accuracy, so the occurrence of minute irregularities due to the vibration of the plug rod can be fatal. It is necessary to suppress the vibration of the plug rod as much as possible.

  Therefore, conventionally, a technique has been proposed in which an aluminum tube and a plug rod are supported by a support roller to suppress vibration generated in the plug rod. For example, a support roller is provided on the transport path of an aluminum tube, and the support roller supports the aluminum tube. After the support roller passes through the rear end of the aluminum tube, the support rod supports the plug rod. To do.

  However, even with this proposed technique, vibrations have not been sufficiently suppressed, and it has been difficult to reliably improve the quality of the drawn tube.

  The present invention has been made in view of the above problems, and provides a drawing method and related technology capable of preventing the plug rod from being vibrated and improving the quality of the drawn tube. Objective.

  In order to achieve the above object, the present inventor first searched for a mechanism when vibration is generated in the plug rod in the drawing method of the proposed technique.

  That is, in the drawing method of the proposed technique, the aluminum tube is supported by the support roller, but after the aluminum tube passes, the plug rod is supported by the support roller. In this way, the object to be supported by the support roller moves from the aluminum tube to the plug rod. At this time, the support roller passes through the step between the outer diameter surface of the large diameter aluminum tube and the outer diameter surface of the small diameter plug rod. become. The inventors investigated the fact that when the support roller passes through this step and contacts the outer peripheral surface of the plug rod, it collides with the outer peripheral surface of the plug rod, and vibration is generated in the plug rod due to the impact.

  Furthermore, the present inventor continuously conducted thorough experimental research, and as a result, if the impact when the support roller moves from the aluminum tube to the plug rod can be reduced, the occurrence of vibration in the plug rod can be effectively prevented. Obtained knowledge.

  Based on the above research results, the present inventor has found an optimum configuration capable of achieving the above object, and has completed the present invention. That is, the gist of the present invention is as follows.

[1] A drawing method in which a tube material is drawn through a drawing die with a plug rod disposed therein,
A plurality of roller members arranged along the conveyance path to the drawing die of the tube material and capable of supporting the tube material and the plug rod are prepared,
Among the plurality of roller members, a pre-passing separation operation for separating the roller member from the tube material is performed on the roller member disposed closest to the drawing die before the rear end of the tube material passes through the roller member. A drawing method characterized by the above.

  [2] The drawing method according to the above item 1, wherein at least two or more roller members among the plurality of roller members supporting the pipe material are caused to perform the separation operation before passing.

  [3] For any one of the roller members, according to item 1 or 2 described above, after the rear end of the tube material passes through the roller member, the roller member is brought into contact with the plug rod to perform a post-passage contact operation for supporting the plug rod. The drawing method described.

  [4] The drawing method according to item 3, wherein the roller member disposed at a position closest to the drawing die is not subjected to the contact operation after passing.

  [5] The drawing method according to any one of items 1 to 4, wherein the roller member is a pair of support rollers that are provided on both sides of the tube material so as to be openable and closable and sandwich and support the tube material.

  [6] The drawing method according to any one of items 1 to 5, wherein an aluminum pipe made of aluminum or an alloy thereof is used as the pipe material.

[7] A drawing method in which a pipe material is drawn through a drawing die with a plug rod disposed therein,
Prepare a roller member that is arranged on the conveyance path to the drawing die of the tube material and supports the tube material and the plug rod,
A drawing method, wherein the roller member is separated from the tube material before the rear end of the tube material passes through the roller member.

  [8] A drawn tube product manufactured by the drawing method described in any one of 1 to 6 above.

[9] A drawing apparatus in which a pipe member is drawn through a drawing die with a plug rod disposed therein,
A plurality of roller members arranged along a conveying path to a pipe drawing die and capable of supporting the pipe and the plug rod;
Among the plurality of roller members, a pre-passing separation operation for separating the roller member from the tube material is performed on the roller member disposed closest to the drawing die before the rear end of the tube material passes through the roller member. A drawing apparatus comprising: a pre-passing separation operation executing means.

  [10] The drawing apparatus according to item 9, wherein the roller member is provided on both sides of the tube material so as to be openable and closable, and includes a pair of support rollers that sandwich and support the tube material.

  [11] The drawing apparatus according to item 9, wherein the roller member is configured by a support roller that supports the tube material so as to receive the load from below.

  [12] The drawing apparatus according to any one of items 9 to 11, wherein the plurality of roller members are arranged at equal intervals along the conveyance path of the pipe material.

[13] A drawing apparatus in which a tube material is drawn through a drawing die with a plug rod disposed therein,
A roller member disposed on a conveying path to a drawing die of the pipe material and supporting the pipe material and the plug rod;
A drawing apparatus comprising: a pre-passing separation operation execution unit configured to perform a pre-passing separation operation for separating the roller member from the tubular member before the rear end of the tubular member passes through the roller member.

[14] A pipe material support device in a drawing apparatus in which a pipe material is drawn through a drawing die with a plug rod disposed therein,
A roller member disposed on a conveying path to a drawing die of the pipe material and supporting the pipe material and the plug rod;
A tube material support device in a drawing apparatus, comprising: a pre-passing separation operation executing means for performing a pre-passing separation operation for separating the roller member from the tube material before the rear end of the tube material passes through the roller member.

[15] A tube material supporting roller member in a drawing apparatus for supporting a tube material and a plug rod when the tube material is drawn through a drawing die with a plug rod disposed therein,
A tube member supporting roller member in a drawing apparatus, wherein the tube member is separated from the tube material before the rear end of the tube material passes.

  According to the drawing method of the invention [1], since the roller member is separated from the tube material before the rear end of the tube material passes, the operation of the roller member when contacting the plug rod can be accurately controlled. . For this reason, it is possible to make the roller member lightly contact the plug rod without applying an impact, to reliably prevent the plug rod from generating vibrations, and to improve the quality of the drawn product.

  According to the drawing method of the invention [2], the above effect can be obtained more reliably.

  According to the drawing method of inventions [3] and [4], the plug rod can be reliably supported.

  According to the drawing method of the invention [5], the pipe material and the plug rod can be reliably supported.

  According to the drawing method of the invention [6], a drawn tube product made of aluminum can be obtained.

  According to the drawing method of the invention [7], the vibration of the plug rod can be prevented and the quality of the drawn product can be improved as described above.

  According to the invention [8], a drawn product having a long size and excellent surface quality can be obtained.

  According to the invention [9], since the drawing apparatus capable of carrying out the above-described invention method is specified, it is possible to prevent the plug rod from being vibrated and to improve the quality of the drawn product. Can be improved.

  According to the drawing apparatus of the invention [10] and [11], the pipe material and the plug rod can be supported more reliably.

  According to the drawing apparatus of the invention [12], the pipe material and the plug rod can be supported in a more stable state.

  According to the drawing apparatus of the invention [13], the vibration of the plug rod can be prevented and the quality of the drawn product can be improved as described above.

  According to the pipe material supporting device in the drawing apparatus of the invention [14], it is possible to prevent the plug rod from being vibrated and to improve the quality of the drawn product, as described above.

  According to the tube material supporting roller member in the drawing apparatus of the invention [15], it is possible to prevent the plug rod from being vibrated and to improve the quality of the drawn product, as described above.

  FIG. 1 is a plan view schematically showing an aluminum tube drawing apparatus according to an embodiment of the present invention. As shown in the figure, this drawing apparatus includes a drawing die (1) and a drawing plug (2) arranged corresponding to the die hole (11) of the drawing die (1). 11) and an extraction plug (2) are formed with an annular forming gap, and an aluminum tube (W) is drawn through the forming gap as a pipe material (element tube). In the present embodiment, the description will be made assuming that the conveyance direction of the aluminum tube (W) (the right direction toward FIG. 1) is “front”.

  The extraction plug (2) is supported by the support member (31) via a plug rod (3) disposed on the conveyance path of the aluminum tube (W).

  In this drawing apparatus, a plurality of roller members (5) are arranged at predetermined intervals along the conveyance path of the aluminum tube (W). The plurality of roller members (5) are configured by first to fifth roller members (51) to (55), and the first to fifth roller members (51) to (55) are arranged in this order in the conveying direction. On the other hand, it is arranged from the upstream side to the downstream side.

  In the present embodiment, among the first to fifth roller members (51) to (55), the fifth roller member (55) is arranged in the transport direction among the plurality of roller members (51) to (55). On the other hand, the roller member is arranged at the most downstream side, that is, at a position closest to the drawing die (1).

  As shown in FIGS. 7 and 8, the roller member (5) is constituted by a pair of support rollers (6) and (6) disposed on the left and right sides of the aluminum tube (W). Each of the support rollers (6) and (6) has a drum shape, and is rotatably supported by the movable frames (7) and (7) in a state where the rotation shafts (61) and (61) are arranged vertically. Yes.

  The movable frames (7) and (7) are configured to be moved by a driving means (not shown) such as a cylinder in a horizontal direction orthogonal to the aluminum tube (W), and each support roller is moved along with the movement. (7) (7) moves in a direction (horizontal direction) that is in contact with or separated from the aluminum tube (W).

  Then, as shown in FIG. 7, the pair of support rollers (6) and (6) move in the direction in which they abut on both sides of the aluminum tube (W) as the movable frames (7) and (7) move. Then, the aluminum tube (W) is configured to be sandwiched and supported from the left and right sides by the pair of support rollers (6) and (6). Further, as shown in FIG. 8, when the pair of support rollers (6) (6) moves in the direction away from the aluminum tube (W) with the movement of the movable frames (7) and (7), and is opened, A pair of support rollers (6) and (6) are separated from the aluminum tube (W) to both sides and the support is released.

  Further, as shown in FIG. 9, when the pair of support rollers (6) (6) is closed in a state where the aluminum tube (W) has passed the position of the pair of support rollers (6) (6), the aluminum tube The plug rod (3) arranged in (W) is configured to be sandwiched and supported from both sides by a pair of support rollers (6) and (6).

  In the present embodiment, a tube material support device is configured by the roller members (51) to (55).

  The drawing apparatus having the above-described configuration includes a control device (not shown) configured by a personal computer or the like. By this control device, each drawing apparatus including a drive unit such as a cylinder of the support roller (6) is provided. The drive unit is controlled, and the operation described later is automatically performed. In this embodiment, the control operation includes a pre-pass separation operation and a post-contact operation, which will be described later, and functions of the control device for performing the pre-pass separation operation and the post-contact operation ( The program) constitutes a pre-passing separation operation execution means and a post-passage contact operation execution means.

  Next, operation | movement of the drawing processing apparatus of this embodiment is demonstrated. First, as shown in FIG. 1, in the initial state where the aluminum tube (W) is set, the plug rod (3) is disposed along the axial center inside the tube. Further, in this initial state, all the roller members (51) to (55) are closed, and the aluminum pipe (W) is clamped (supported). Further, the tip end side of the aluminum tube (W) is inserted into a forming gap between the drawing die (1) and the drawing plug (2) and is held by a chuck member (not shown).

  In this state, the chuck member moves in the drawing direction (forward), and drawing is started. When the drawing process is started and the aluminum pipe (W) is conveyed and the rear end (W1) of the aluminum pipe (W) approaches the first roller member (51) as shown in FIGS. That is, immediately before the rear end (W1) of the aluminum tube (W) passes through the first roller member (51), the support rollers (6) and (6) of the first roller member (51) are opened, and aluminum The support to the pipe (W) is released (separation operation before passing).

  Here, as a method of detecting that the rear end (W1) of the aluminum tube (W) has approached the first roller member (51), a method using a rear end position detection sensor or the like can be employed. As the rear end position detection sensor, for example, a reflection type detection sensor that detects the rear end position of the aluminum pipe (W) by detecting the presence or absence of reflection of light irradiated toward the aluminum pipe (W), or an aluminum pipe A projector and a light receiver are arranged across (W), and the rear end position of the aluminum tube (W) is detected based on whether or not the light irradiated from the projector to the light receiver is blocked by the aluminum tube (W). A transmission-type detection sensor or the like can be suitably used.

  In the present embodiment, for example, this rear end position detection sensor is disposed upstream of the first roller member (51) in the pipe conveyance direction, and the rear end position of the aluminum pipe (W) is detected at that position. When the control device receives a signal to that effect from the rear end position detection sensor, the drive of the first roller member (51) is controlled to support the support roller (6) of the first roller member (51). What is necessary is just to comprise so that (6) may be opened.

  As the rear end position detection sensor, a contact type detection sensor may be used in addition to the non-contact type sensor such as the reflection type detection sensor or the transmission type detection sensor.

  In the present embodiment, it is also possible to detect that the rear end (W1) of the aluminum tube (W) has approached the first roller member (51) without using the rear end position detection sensor. . For example, the position of the rear end (W1) of the aluminum tube being transported can be measured based on the rear end position of the aluminum tube (W) in the initial state, the transport speed of the aluminum tube (W), the transport elapsed time, and the like. Therefore, it is also possible to detect that the rear end (W1) of the aluminum tube (W) has approached the first roller member (51) based on the measured position of the rear end (W1).

  Furthermore, in this embodiment, the method of using the rear end position detection sensor and the method of measuring the position of the rear end (W1) of the aluminum tube from the transport speed, the elapsed time of transport, etc. are combined to form the rear end (W1) of the aluminum tube. The position of may be detected.

  As will be described later, in the second to fifth roller members (52) to (55), it is necessary to detect that the rear end (W1) of the aluminum tube (W) is approaching. Alternatively, the same means as described above may be used.

  After the pair of support rollers (6) and (6) of the first roller member (51) are opened, the rear end (W1) of the aluminum tube (W) passes through the roller position. 3 and 9, after the passage, the pair of support rollers (6) and (6) of the first roller member (51) are closed, and the plug rod (3) becomes the first roller member (51). Are sandwiched (supported) by a pair of support rollers (6) and (6) (contact operation after passing).

  Here, as a method of detecting that the rear end (W1) of the aluminum tube (W) has passed through the first roller member (51), the method using the rear end position detection sensor, the conveyance speed, A method of measuring the position of the rear end (W1) from time or the like, a method of combining both detection methods, and the like can be employed.

  For example, when the rear end position detection sensor is arranged downstream of the first roller member (51) in the pipe conveyance direction, and the rear end position of the aluminum pipe (W) is detected at that position, When the control device receives a signal to that effect from the rear end position detection sensor, the drive of the first roller member (51) is controlled, and the support rollers (6) and (6) of the first roller member (51). What is necessary is just to comprise so that it may be closed.

  As will be described later, in the second to fifth roller members (52) to (55), it is necessary to detect that the rear end (W1) of the aluminum tube (W) has passed. Alternatively, the same means as described above may be used.

  In the present embodiment, the operation of continuously performing the separation operation before passage and the contact operation after passage is referred to as “separation / contact operation”.

  After the plug rod (3) is clamped by the first roller member (51), when the rear end (W1) of the aluminum tube (W) approaches the second roller member (52) as shown in FIG. The pair of support rollers (6) and (6) of the roller member (52) is opened, and the support to the aluminum tube (W) is released.

  Subsequently, as shown in FIG. 4, after the rear end (W1) of the aluminum tube (W) passes through the second roller member (52), the second roller member (52) is closed, and the pair of support rollers. (6) The plug rod (3) is clamped (supported) by (6).

  In the same manner, as shown in FIGS. 4 and 5, the third / fourth roller members (53) and (54) perform the same separation / contact operation as described above. That is, when the rear end (W1) of the aluminum tube (W) approaches, each roller member (53) (54) is opened to release the support for the aluminum tube (W), while each roller member (53). After the rear end (W1) of the aluminum tube (W) passes through (54), the roller members (53) (54) are respectively closed, and the plug rods (6) (6) are plugged ( 3) is clamped (supported).

  Thereafter, in the fifth roller member (55), only the separation operation before passage is performed, and the contact operation after passage is not performed. That is, before the rear end (W1) of the aluminum tube (W) passes through the fifth roller member (55), the fifth roller member (55) is opened and the support of the aluminum tube (W) is released.

  Then, the rear end (W1) of the aluminum tube (W) passes through the drawing die (1) with the fifth roller member (55) being opened, and the drawing process is completed.

  In the present invention, a post-passage contact operation may be performed on the fifth roller member (55). That is, as shown in FIG. 6, after the rear end of the aluminum tube (W) has passed through the fifth roller member (55), the fifth roller member (55) is closed and a pair of support rollers (6) (6) The plug rod (3) may be clamped by.

  As described above, according to the drawing apparatus of the present embodiment, each roller member (5) performs the separation operation before passing, so that the support rollers (6) and (6) collide with the plug rod (3). Thus, it is possible to reliably prevent the plug rod (3) from generating vibration.

  That is, since the supporting rollers (6) and (6) are separated before the rear end (W1) of the aluminum tube (W) passes, the supporting roller (6) is moved from the separated state to the plug rod (3). When contacting, it is possible to accurately control the movement speed and the approach direction of the support rollers (6) and (6). For this reason, the support rollers (6) and (6) can be lightly brought into contact with the plug rod (3) without impact, and the occurrence of vibration in the plug rod (3) can be reliably prevented. Therefore, the drawing plug (2) does not vibrate during the drawing process, and it is possible to reliably prevent problems such as the occurrence of minute irregularities on the surface of the drawing tube, and to improve the quality of the drawn product. .

  For example, the support rollers (6) and (6) are held at the rear end of the aluminum tube (W) in a state where the support rollers (6) and (6) are sandwiched between the aluminum tubes (W) without performing the separation operation before passing. When (W1) passes, the support rollers (6) and (6) are pressed against the outer peripheral surface of the plug rod (3) according to the clamping force of the cylinder or the like immediately after the passage, so that the plug rod There is a risk of vibration in (3).

  In the present embodiment, among the first to fifth roller members (51) to (55), the fifth roller member (55) closest to the drawing die (1) is also performing the separation operation before passing. It is possible to more reliably prevent the plug rod (3) from vibrating.

  That is, in the roller member (5) located far from the drawing die (1), for example, in the first roller member (51), when the pre-passing separation operation is not performed, vibration is generated in the plug rod (3) at that position. However, the vibration can be absorbed by the second to fifth roller members (52) to (55) disposed on the downstream side of the first roller member (51), and the adverse effect due to the vibration is avoided. Can do. Therefore, in the roller members (52) to (54) other than the fifth roller member (55), the vibration generated in the plug rod (3) is generated on the downstream side without performing the separation operation before passing. It can be absorbed by the member, and adverse effects due to vibration can be reduced.

  However, in the fifth roller member (55), when the separation operation before passing is not performed, the vibration generated in the plug rod (3) cannot be absorbed there, and is transmitted to the drawing plug (2) to be drawn product. The quality of the product may be degraded.

  Therefore, in the present invention, it is desirable to perform the pre-passing separation operation on the roller member (55) disposed at the position closest to the drawing die (1) among the plurality of roller members (51) to (55).

  In the present embodiment, since the pre-passage separation operation is performed in all the roller members (51) to (55), the plug rod (3) is placed at the positions of all the roller members (51) to (55). It is possible to reliably prevent the occurrence of vibration, to obtain a more excellent vibration preventing effect, and to further improve the quality of the drawn product.

  However, in the present invention, it is not always necessary to perform the pre-pass separation operation in all the roller members (51) to (55), and the pre-pass separation operation is performed in at least one of the roller members (51) to (55). You may do it. Even in this case, the effect of preventing vibration of the plug rod (3) can be obtained.

  In this embodiment, the aluminum tube (W) is supported by all the roller members (5), and the plug rod (3) is supported by the post-passage contact operation by the roller members (51) to (54). Therefore, it is possible to prevent the aluminum tube (W) and the plug rod (3) from being bent due to their own weight, and also to suppress the vibration that is inadvertently generated in the plug rod (3), etc. Quality can be further improved.

  In the above embodiment, in the initial state, all the roller members (51) to (55) are closed to sandwich the aluminum tube (W). However, the present invention is not limited to this, and in the present invention, a predetermined roller member is used. You may make it support only.

  For example, in the initial state, the first, fourth, and fifth roller members (51), (54), and (55) are closed to sandwich the aluminum tube (W), and the other roller members (second and third rollers 52, 53) may be opened and the drawing process may be started in this state. In this case, for example, the first, fourth, and fifth roller members (51), (54), and (55) can perform the separation operation before passing, and the second and third roller members (52) ( 53), a contact operation after passing can be performed. Furthermore, in the initial state, when the aluminum tube (W) is supported only by a predetermined roller member, it is preferably supported by at least three or more roller members.

  In the present invention, it is not always necessary to perform the contact operation after passing the roller member that has been separated before passing, and the roller member that has been separated before passing is directly separated from the plug rod. Drawing may be performed.

  Needless to say, in the present invention, the number of roller members for supporting the aluminum tube (W) and the plug rod (3) is not limited to five, and may be four or less. There may be more than one.

  In the above embodiment, each roller member (5) is configured to be sandwiched by the pair of support rollers (6) and (6) from both the left and right sides of the aluminum tube (W). However, the present invention is not limited to this. , A pair of support rollers (6) and (6) are arranged on both upper and lower sides of the aluminum tube (W) so that the aluminum tube (W) is sandwiched from both upper and lower sides by the support rollers (6) and (6). Anyway.

  Furthermore, in the said embodiment, although the roller member is comprised by a pair of support roller (6) (6) clamped from both sides, it is not restricted to it, In this invention, it is one support roller or V shape. You may make it comprise with a pair of support roller arrange | positioned.

  For example, as shown in FIGS. 10 and 11, as each roller member (5), one constituted by one support roller (6) can also be adopted. In other words, in this drawing apparatus, in each roller member (5), the drum-shaped support roller (6) is disposed at a lower position in the conveyance path of the aluminum tube (W). The support roller (6) is configured to be movable up and down through a lifting frame (71).

  Since other configurations are substantially the same as those of the above-described embodiment, the same portions are denoted by the same or corresponding reference numerals, and redundant description is omitted.

  In the drawing apparatus according to this modification, in the initial state, the support roller (6) of each of the roller members (51) to (55) is set to a height position that supports the aluminum tube (W), and each roller member The aluminum tube (W) is supported by the support rollers (6) of (51) to (55) in such a manner that the load is received from below.

  When drawing is started from this state and the rear end (W1) of the aluminum tube (W) approaches the first roller member (51), the support roller (6) of the first roller member (51) is lowered downward. Then, it separates from the aluminum tube (W) (separation operation before passing). Subsequently, after the rear end (W1) of the aluminum tube (W) passes through the first roller member (51), the support roller (6) of the first roller member (51) rises and contacts the plug rod (3). The plug rod (3) is supported by the support roller (6) (contact operation after passing).

  Similarly, when the rear end (W1) of the aluminum tube (W) approaches the second to fourth roller members (52) to (54), the support rollers (52) to (55) of the roller members (52) to (55) 6) descends and separates from the aluminum tube (W) (separating operation before passing). Subsequently, after the rear end (W1) of the aluminum tube (W) passes through the roller members (52) to (54), the support rollers (6) of the roller members (52) to (54) are raised. The plug rod (3) comes into contact with each other, and the plug rod (3) is supported by each support roller (6) (contact operation after passage).

  Subsequently, when the rear end (W1) of the aluminum tube (W) approaches the fifth roller member (55), the fifth roller member (55) is separated from the aluminum tube (W), and the aluminum tube (W ) Passes through the drawing die (1). Needless to say, also in this modification, the fifth roller member (55) may be made to perform a post-passage contact operation.

  According to the drawing apparatus of this modification, since the separating operation before passing and the contacting operation after passing are performed, the operation of the support roller (6) when contacting the plug rod (3) is accurately controlled. be able to. Accordingly, the support roller (6) can be brought into light contact with the plug rod (3) without causing an impact, and the occurrence of vibration in the plug rod (3) can be reliably prevented.

  In this modification as well, vibration is generated in the plug rod (3) when the roller member (5) is not separated before passing. That is, when the rear end (W1) of the aluminum tube (W) passes through the support roller (6) while the aluminum tube (W) is supported by the support roller (6), the plug rod is caused by its own weight immediately after the passage. (3) descends and collides with the support roller (6), and the plug rod (3) is vibrated.

  In the drawing apparatus according to this modification, as in the above-described embodiment, either the aluminum tube (W) or the plug rod (3) is supported by the roller members (51) to (55). The aluminum tube (W) and the plug rod (3) can be prevented from bending due to their own weight, and the vibration generated in the plug rod (3) and the like can be suppressed, thereby further improving the quality of the drawn product. be able to.

  The drawing method of the present invention is employed when drawing a pipe material such as an aluminum pipe.

It is a schematic plan view which shows the drawing processing apparatus which is embodiment of this invention in an initial state. It is a schematic plan view which shows the drawing apparatus of embodiment in the 1st roller member separation state. It is a schematic plan view which shows the drawing apparatus of embodiment in the 2nd roller member separation state. It is a schematic plan view which shows the drawing processing apparatus of embodiment in the 3rd roller member separation state. It is a schematic plan view which shows the drawing apparatus of embodiment in the 5th roller member separation state. It is a schematic plan view in the case of supporting a rod with a 5th roller member after pipe material passage in a drawing processing device of an embodiment. It is a front view which shows the roller member in the drawing apparatus of embodiment in a pipe material holding state. It is a front view which shows the roller member in the drawing processing apparatus of embodiment in an open state. It is a front view which shows the roller member in the drawing apparatus of embodiment in a plug rod holding state. It is a schematic side view which shows the drawing processing apparatus which is a modification of this invention. It is a front view which shows the roller member in the drawing apparatus of a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Extraction die 3 ... Plug rod 5, 51-55 ... Roller member 6 ... Support roller W ... Aluminum pipe | tube (pipe material)
W1 ... rear end

Claims (15)

It is a drawing method in which the tube material is drawn through a drawing die with a plug rod disposed therein,
A plurality of roller members arranged along the conveyance path to the drawing die of the tube material and capable of supporting the tube material and the plug rod are prepared,
Among the plurality of roller members, a pre-passing separation operation for separating the roller member from the tube material is performed on the roller member disposed closest to the drawing die before the rear end of the tube material passes through the roller member. A drawing method characterized by the above.   The drawing method according to claim 1, wherein among the plurality of roller members that support the tube material, at least two or more roller members are caused to perform a separation operation before passing.   3. The post-passage contact operation of supporting any one of the roller members by supporting the plug rod by bringing the roller member into contact with the plug rod after the rear end of the tube has passed through the roller member. Drawing process.   The drawing method according to claim 3, wherein the post-passage contact operation is not performed on the roller member disposed at a position closest to the drawing die.   The drawing method according to any one of claims 1 to 4, wherein the roller member is a pair of support rollers that are provided on both sides of the tube material so as to be openable and closable and sandwich and support the tube material.   The drawing method according to any one of claims 1 to 5, wherein an aluminum pipe made of aluminum or an alloy thereof is used as the pipe material. It is a drawing method in which the tube material is drawn through a drawing die with a plug rod disposed therein,
Prepare a roller member that is arranged on the conveyance path to the drawing die of the tube material and supports the tube material and the plug rod,
A drawing method, wherein the roller member is separated from the tube material before the rear end of the tube material passes through the roller member.   A drawn tube product manufactured by the drawing method according to any one of claims 1 to 6. In a state where the plug rod is disposed inside the pipe material, the drawing device is configured to be drawn through a drawing die,
A plurality of roller members arranged along a conveying path to a pipe drawing die and capable of supporting the pipe and the plug rod;
Among the plurality of roller members, a pre-passing separation operation for separating the roller member from the tube material is performed on the roller member disposed closest to the drawing die before the rear end of the tube material passes through the roller member. A drawing apparatus comprising: a pre-passing separation operation executing means.   The drawing apparatus according to claim 9, wherein the roller member is configured by a pair of support rollers that are provided on both sides of the tube material so as to be openable and closable and sandwich and support the tube material.   The drawing apparatus according to claim 9, wherein the roller member is configured by a support roller that supports the tube material so as to receive the load from below.   The drawing apparatus according to any one of claims 9 to 11, wherein the plurality of roller members are arranged at equal intervals along the conveyance path of the pipe material. In a state where the plug rod is disposed inside the pipe material, the drawing device is configured to be drawn through a drawing die,
A roller member disposed on a conveying path to a drawing die of the pipe material and supporting the pipe material and the plug rod;
A drawing apparatus comprising: a pre-passing separation operation execution unit configured to perform a pre-passing separation operation for separating the roller member from the tubular member before the rear end of the tubular member passes through the roller member. A pipe material support device in a drawing apparatus in which a pipe material is drawn through a drawing die with a plug rod disposed therein,
A roller member disposed on a conveying path to a drawing die of the pipe material and supporting the pipe material and the plug rod;
A tube material support device in a drawing apparatus, comprising: a pre-passing separation operation executing means for performing a pre-passing separation operation for separating the roller member from the tube material before the rear end of the tube material passes through the roller member. A tube member supporting roller member in a drawing apparatus for supporting a tube material and a plug rod when the tube material is drawn through a drawing die with the plug rod disposed therein,
A tube member supporting roller member in a drawing apparatus, wherein the tube member is separated from the tube material before the rear end of the tube material passes.

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