JP2020040083A - Resin film formation facility of metal pipe - Google Patents

Abstract

To provide a resin film formation facility of a metal pipe which can properly and efficiently form a resin film for lubrication on a surface of the metal pipe before being subjected to cold drawing.SOLUTION: A resin film formation facility includes: a conveyance device 1 that conveys a metal pipe P; a heating device 2 that heats the metal pipe conveyed by the conveyance device; an outer surface resin coating device 3 that coats an outer surface of the metal pipe conveyed by the conveyance device with a resin; an inner surface resin coating device 4 that coats an inner surface of the metal pipe conveyed by the conveyance device with a resin; and an air blowing device 5 that blows air to the inside of the metal pipe conveyed by the conveyance device. The heating device, the outer surface resin coating device, the inner surface resin coating device and the air blowing device are arranged in this order from the upstream side to the downstream side in a conveyance direction of the metal pipe by the conveyance device.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a metal tube resin film forming facility capable of appropriately and efficiently forming a lubricating resin film on the surface (outer surface and inner surface) of a metal tube before cold drawing.

As a method of reducing the diameter of a metal tube such as a steel tube, a cold drawing process (cold drawing process) in which a plug or a mandrel is inserted into the metal tube and the metal tube is drawn through a die is known.
In this cold drawing, the surface (external surface) of the metal tube is subjected to cold drawing in order to prevent seizure between the metal tube as a workpiece and a tool (plug, mandrel, die). And an inner surface).

Various types of lubricating coatings are known. Among them, a resin having excellent lubricity as a coating for facilitating cold drawing of a metal tube made of a difficult-to-process material such as a high alloy steel or a Ni-based alloy. A coating has been proposed (for example, see Patent Document 1).
Conventionally, various preferable materials for the resin film have been proposed in Patent Document 1 and the like, but no equipment capable of appropriately and efficiently forming the resin film has been proposed.

JP 2007-268580 A

  The present invention has been made in order to solve the above-mentioned problems of the related art, and a resin coating for lubrication is appropriately and efficiently applied to a surface (an outer surface and an inner surface) of a metal tube before cold drawing. An object of the present invention is to provide a facility for forming a resin film of a metal tube that can be formed.

  In order to solve the above-mentioned problems, the present invention is a facility for forming a resin film for lubrication on a surface of a metal tube before performing cold drawing, and a conveying device for conveying the metal tube; and the conveying device. A heating device that heats the metal tube transported by the above, an outer surface resin coating device that applies a resin to the outer surface of the metal tube transported by the transport device, and a metal tube transported by the transport device. An internal resin application device for applying a resin to the inner surface, and a blower for blowing air into the metal pipe conveyed by the conveyance device, the heating device, the external resin application device, the internal resin application device And the blower is arranged in this order from the upstream side to the downstream side in the transport direction of the metal pipe by the transport unit in this order.

  According to the resin film forming equipment according to the present invention, a heating device, an outer resin coating device, an inner resin coating device, and a blowing device are arranged in this order from upstream to downstream in the transport direction of the metal pipe by the transport device. ing. For this reason, the metal tube is first heated by the heating device. Due to the heat of the heated metal tube, it is possible to increase the drying speed of the resin applied by the outer surface resin application device and the inner surface resin application device located downstream of the heating device in the transport direction of the metal tube. .

  According to the resin film forming equipment of the present invention, after the resin is applied to the outer surface of the metal pipe by the outer resin coating device, the resin is applied to the inner surface of the metal tube by the inner resin coating device. In other words, the resin applied to the outer surface of the metal tube has a higher temperature than the resin applied to the inner surface of the metal tube (a state in which the temperature of the heated metal tube decreases less). Will be applied. Further, the resin applied to the outer surface of the metal tube can secure a longer drying (natural drying) time in the process of transferring the metal tube by the transfer device than the resin applied to the inner surface of the metal tube. Accordingly, the resin applied to the outer surface of the metal tube easily dries. Usually, since the outer surface of the metal tube comes into contact with a member constituting the transfer device and is conveyed, the resin applied to the outer surface of the metal tube is compared with the resin applied to the inner surface of the metal tube due to this contact. Is easier to peel off. According to the resin film forming equipment according to the present invention, as described above, the resin applied to the outer surface of the metal tube is easily dried, so that the risk of the resin being peeled can be reduced.

  Further, according to the resin film forming equipment of the present invention, after the resin is applied to the inner surface of the metal tube by the inner resin coating device, the air is blown into the metal tube by the blower. When applying the resin to the inner surface of the metal tube with the inner resin coating device, the temperature of the metal tube is lower than when applying the resin to the outer surface of the metal tube with the outer resin coating device. The resin applied to the inner surface of the resin is hard to dry. Further, even when the temperature drop of the metal tube is small, the moisture of the resin applied to the inner surface of the metal tube evaporates and stays inside the metal tube, so that the resin once dried may be reliquefied. . According to the resin film forming equipment according to the present invention, as described above, since the inside of the metal tube is blown by the blower, the resin applied to the inner surface is easily dried, and the dripping of the resin can be reduced. is there.

  As described above, according to the resin film forming equipment according to the present invention, the heating device, the outer resin coating device, the inner resin coating device, and the blowing device are arranged in an appropriate order for forming the resin film on the surface of the metal tube. It can be executed while sequentially transported by the transport device from the heating of the metal tube by the heating device to the blowing of the inside of the metal tube by the blower. Therefore, according to the resin film forming equipment of the present invention, it is possible to appropriately and efficiently form a lubricating resin film on the surface of the metal pipe before cold drawing.

  Preferably, the transport device, at least between the inner surface resin coating device and the blower, comprises a traverse mechanism for traversing the metal tube in a horizontal direction orthogonal to a longitudinal direction of the metal tube, The transverse feed mechanism includes a support unit that supports a part of the outer surface of the metal tube in the longitudinal direction from below, and a moving unit that moves the support unit in a horizontal direction orthogonal to the longitudinal direction of the metal tube.

  According to the above-described preferred configuration, the metal pipe is laterally fed by the traverse mechanism at least between the inner surface resin coating device and the blower. At the time of this lateral feed, the outer surface of the metal tube comes into contact with the support portion that supports a part of the longitudinal direction from below, but the support portion is moved in the lateral feed direction (horizontal direction orthogonal to the longitudinal direction of the metal tube) by the moving portion. By moving, the metal tube is traversed integrally with the support. In other words, at the time of laterally feeding the metal tube, the portion of the outer surface of the metal tube with which the supporting portion contacts does not change. For this reason, even if the resin applied to the outer surface of the metal tube by the outer surface resin coating device is peeled off during transportation (during lateral feeding), it remains on a part of the outer surface of the metal tube in contact with the support. Even if the applied resin is peeled off on a part of the outer surface of the metal tube, if the area of the support portion that comes into contact with the outer surface of the metal tube is reduced, the area of the peeled portion is also reduced. When cold drawing is performed on the metal tube, it is considered that the resin film formed on the outer surface of the metal tube is extended to some extent in the longitudinal direction of the metal tube due to friction with a die. For this reason, if the area of the peeled part is small, the peeled part is also filled with the resin, and it is considered that seizure hardly occurs.

  Preferably, the inner surface resin coating device is inserted into the inside of the metal tube, and a rod portion that moves forward and backward in the longitudinal direction of the metal tube, and is attached to a tip of the rod portion, and applies resin to the inner surface of the metal tube. A resin discharge nozzle for discharging, wherein the rod portion advances until the resin discharge nozzle reaches a first end portion of the metal tube located on the side opposite to the insertion side of the resin discharge nozzle and the rod portion. After moving, the rod discharges the resin from the resin discharge nozzle while retreating toward the second end of the metal pipe positioned on the insertion side of the resin discharge nozzle and the rod. The resin is applied to the inner surface of the metal tube.

  According to the above preferred configuration, the resin is applied to the inner surface of the metal tube by discharging the resin from the resin discharge nozzle attached to the tip of the rod inserted into the metal tube. When the resin is applied to the inner surface of the metal tube, the resin discharge nozzle and the rod portion are moved from the first end (the end of the metal tube located on the side opposite to the insertion side of the resin discharge nozzle and the rod portion) from the second end. (The end of the metal tube located on the insertion side of the resin discharge nozzle and the rod portion). In other words, when the resin is applied to the inner surface of the metal tube, the rod portion is located on the downstream side in the moving direction rather than the resin discharge nozzle. For this reason, there is no possibility that the rod portion comes into contact with the inner surface of the metal tube after the resin is applied by the resin discharge nozzle, and there is no possibility that the resin applied to the inner surface is peeled off by contact with the rod portion.

  Preferably, the inner surface resin application device further includes a cleaning nozzle for cleaning the resin discharge nozzle after applying the resin to the inner surface of the metal tube.

  According to the above preferred configuration, after the resin is applied to the inner surface of the metal pipe by the resin discharge nozzle that retreats from the first end to the second end, the same retreat operation is continued to perform the cleaning. The resin discharge nozzle can be cleaned by the nozzle. Accordingly, clogging of the resin discharge nozzle can be efficiently prevented.

  ADVANTAGE OF THE INVENTION According to the resin film forming equipment of a metal tube which concerns on this invention, the resin film for lubrication can be formed appropriately and efficiently on the surface (outer surface and inner surface) of the metal tube before performing cold drawing.

It is a top view showing typically the schematic structure of the resin film formation equipment concerning one embodiment of the present invention. FIG. 2 is a front view schematically showing a schematic configuration of the external resin coating device shown in FIG. 1. FIG. 2 is a cross-sectional plan view schematically illustrating a schematic configuration of a distal end portion of the inner resin coating device in a state where the inner resin coating device illustrated in FIG. 1 is inserted into a metal tube. FIG. 2 is a side view schematically illustrating an arrangement state of a cleaning nozzle illustrated in FIG. 1. FIG. 2 is a front view schematically showing a schematic configuration of the lateral feed mechanism shown in FIG. 1. FIG. 2 is a plan view schematically showing a schematic configuration of the blower shown in FIG. 1.

Hereinafter, a resin film forming facility (hereinafter, simply referred to as “resin film forming facility”) of a metal tube according to an embodiment of the present invention will be described with reference to the accompanying drawings as appropriate.
FIG. 1 is a plan view schematically showing a schematic configuration of the resin film forming equipment according to the present embodiment. 1 indicate the transport direction of the metal pipe P. The same applies to the thick arrows shown in FIG. 5 described later.
As shown in FIG. 1, the resin film forming equipment 100 according to the present embodiment includes a transport device 1, a heating device 2, an outer resin coating device 3, an inner resin coating device 4, and a blowing device 5. ing. The heating device 2, the outer resin coating device 3, the inner resin coating device 4, and the blower device 5 are arranged in this order from upstream to downstream in the transport direction of the metal pipe P by the transport device 1.

The transfer device 1 is a device that transfers the metal pipe P. Specifically, the transport device 1 of the present embodiment includes a crane (not shown) for loading and unloading the metal tube P to and from the heating device 2 and a plurality of metal tubes P placed thereon. By transporting the transport table 11 one by one to the downstream side in the transport direction and supporting the outer surface of the metal pipe P from below and rotating about a rotation axis extending along a horizontal direction orthogonal to the longitudinal direction of the metal pipe P, A transport roller 12 that transports the metal pipe P in the longitudinal direction of the metal pipe P, and a rotary kicker that transports the metal pipe P from a position where the outer resin coating device 3 is provided to a position where the inner resin coating device 4 is provided (FIG. (Not shown) and a traversing mechanism 13 for traversing the metal tube P in a horizontal direction orthogonal to the longitudinal direction of the metal tube P.
Note that the transfer device 1 located downstream from the position where the outer surface resin coating device 3 is provided in the transfer direction of the metal tube P is configured so that the resin applied to the outer surface of the metal tube P is hardly peeled off. It is preferable to provide a cushioning material (for example, a resin product such as MC nylon) at a portion that may come into contact with the outer surface of the. As the transport roller 12, a resin lining roller is preferably employed.

The heating device 2 is a device that heats the metal pipe P transported by the transport device 1 (crane). Specifically, the heating device 2 of the present embodiment includes a hot water tank. Then, about 4 to 6 metal pipes P are bundled with a wire or the like, hung by a crane, and immersed in a hot water tank for a certain time to heat the metal pipes P.
The heating temperature of the metal tube P (that is, the temperature of the hot water in the hot water tank) is set, for example, to 70 ° C to 90 ° C. The heating temperature is determined by the environmental conditions (heating, etc.) that affect the film thickness of the resin film formed on the surface of the metal tube P and the decrease in the surface temperature of the metal tube P before the resin is applied to the surface after heating. It may be determined according to the elapsed time until the post-resin application, room temperature (temperature in the factory), and the like. Specifically, the larger the thickness of the resin film, the more difficult it is for the applied resin to dry. Therefore, it is preferable to increase the heating temperature of the metal tube P. In addition, as the thickness of the metal tube P is smaller, the rate of decrease in the surface temperature of the metal tube P is higher. Therefore, it is preferable to increase the heating temperature of the metal tube P. Furthermore, the longer the number of metal tubes P heated simultaneously, the longer the elapsed time until the resin is applied to the surface of the last metal tube (the metal tube conveyed most upstream in the conveyance direction) P. As a result, the surface temperature at the time of applying the resin decreases, so it is preferable to increase the heating temperature of the metal tube P.
In addition, the heating device 2 is not limited to the configuration including the hot water tank, but may adopt a configuration including a hot-air drying tank.

  The metal pipe P heated by the heating device 2 is carried into the transfer table 11 by using the crane of the transfer device 1 and placed thereon. The transport table 11 includes a transport mechanism such as a kicker, and transports the placed metal tubes P one by one to the downstream side in the transport direction. The metal pipe P unloaded from the transport table 11 is transported in the longitudinal direction by the transport rollers 12 of the transport device 1 to the position S1 where the external resin coating device 3 is provided.

FIG. 2 is a front view (seen from the longitudinal direction of the metal tube P) schematically showing a schematic configuration of the outer surface resin coating device 3. The dashed arrow shown in FIG. 2 indicates the direction in which the resin is discharged.
The outer surface resin coating device 3 is a device that applies a resin to the outer surface of the metal pipe P. As shown in FIG. 2, the outer surface resin coating device 3 includes a resin discharge nozzle 31, a traveling vehicle 32, a mounting jig 33, and a rotating roller 34.

The resin discharge nozzle 31 is arranged above the metal pipe P. The resin discharge nozzle 31 is connected to a resin supply source (not shown), and discharges a resin (for example, an acrylic resin) toward the outer surface of the metal pipe P below.
In addition, the resin discharge nozzle 31 of this embodiment may be damaged by contacting the metal pipe P when the metal pipe P is transferred (particularly, when the metal pipe P is transferred after the outer surface resin is applied). By rotating the mounting jig 33 about the vertical axis so that it does not occur, the mounting jig 33 can be retracted to a retracted position deviated from above the metal pipe P.

  The traveling carriage 32 travels along the longitudinal direction of the metal tube P (the direction perpendicular to the plane of the paper of FIG. 2). Since the resin discharge nozzle 31 is attached to the traveling vehicle 32 by the mounting jig 33, the traveling vehicle 32 travels along the longitudinal direction of the metal pipe P, so that the resin discharge nozzle 31 also moves in the longitudinal direction of the metal pipe P. Will move along.

  The rotation roller 34 rotates around a rotation axis extending along the longitudinal direction of the metal tube P. When the rotation roller 34 rotates, the metal pipe P also rotates in the circumferential direction. Specifically, immediately after the metal pipe P is transported to the position S <b> 1 where the outer surface resin coating device 3 is provided, the metal pipe P is supported by the transport rollers 12. After that, the metal roller P is supported by the rotating roller 34 by raising the rotating roller 34 above the transport roller 12. Then, as described above, the rotation of the rotation roller 34 causes the metal tube P to rotate in the circumferential direction.

When the resin is applied to the outer surface of the metal tube P by the outer surface resin coating device 3 having the above configuration, the resin is discharged from the resin discharge nozzle 31 toward the outer surface of the metal tube P rotating in the circumferential direction by the rotating roller 34. While traveling, the traveling carriage 32 is caused to travel. Thereby, it is possible to apply the resin to the entire outer surface of the metal tube P.
The rotation speed of the metal tube P, the moving speed of the resin discharge nozzle 31, and the resin discharge amount of the resin discharge nozzle 31 are set so that a resin film having a desired film thickness can be uniformly formed on the entire outer surface of the metal tube P. do it. The rotation speed of the metal tube P can be changed by, for example, using a rotation speed variable type rotation roller 34 and adjusting the rotation speed of the rotation roller 34. The moving speed of the resin discharge nozzle 31 can be changed by, for example, using a variable traveling speed type as the traveling vehicle 32 and adjusting the traveling speed of the traveling vehicle 32. The resin discharge amount of the resin discharge nozzle 31 can be changed by, for example, adjusting the supply amount from a resin supply source or replacing the nozzle with a nozzle having a different discharge port size.

  The metal tube P, whose resin is applied to the outer surface by the outer resin coating device 3, is transported by the rotary kicker (not shown) of the transport device 1 to a position S2 where the inner resin coating device 4 is provided. Specifically, the metal pipe P is transported onto a support 131 of the lateral feed mechanism 13 described below.

FIG. 3 is a cross-sectional plan view schematically illustrating a schematic configuration of a distal end portion of the inner resin coating device 4 in a state where the inner resin coating device 4 is inserted inside the metal pipe P. The dashed arrow shown in FIG. 3 indicates the direction in which the resin is discharged.
The inner surface resin coating device 4 is a device that applies a resin to the inner surface of the metal pipe P. As shown in FIG. 1 or 3, the inner resin coating device 4 includes a rod portion 41, a resin discharge nozzle 42, and a traveling vehicle 43.

The rod portion 41 is inserted into the metal tube P, and moves forward and backward in the longitudinal direction of the metal tube P. Specifically, a traveling vehicle 43 is attached to the rear end of the rod portion 41 (the end located on the side opposite to the insertion side of the rod portion 41, the right end in FIG. 1). The rod portion 41 also moves forward and backward by moving forward and backward along the longitudinal direction of.
The rod portion 41 includes a guide portion 41a whose diameter is increased at an appropriate position in the longitudinal direction. The diameter (maximum diameter) of the guide portion 41a is larger than the diameter (maximum diameter) of the resin discharge nozzle 42 and smaller than the inner diameter of the metal pipe P. Thus, only the guide portion 41a contacts the inner surface of the metal tube P, the entire rod portion 41 can smoothly advance and retreat without contacting the inner surface of the metal tube P, and the resin discharge nozzle 42 It is possible to avoid the possibility of damage due to contact with the inner surface of P.

The resin discharge nozzle 42 is attached to the tip of the rod portion 41 (the end located on the insertion side of the rod portion 41, the left end in FIG. 1), and the rod portion 41 moves forward (moves in the insertion direction). , Is inserted into the metal tube P. The resin discharge nozzle 42 is connected to a resin supply source (not shown), and discharges a resin (for example, an acrylic resin or the like) to the inner surface of the metal tube P.
In the present embodiment, a bell cup nozzle is used as the resin discharge nozzle 42. The resin discharge nozzle (bell cup nozzle) 42 is attached to the rod 41 so as to be rotatable at high speed by an air motor around the central axis of the rod 41, and a large number of small discharge nozzles provided on the resin discharge nozzle 42 while rotating at high speed. By discharging the resin from the outlet, it is possible to uniformly apply the resin to the inner surface of the metal pipe P in the circumferential direction. As for the specific configuration of the resin discharge nozzle 42, various known bell cup nozzles can be applied, and a detailed description thereof will be omitted here.

When applying the resin to the inner surface of the metal pipe P by the inner surface resin application device 4 having the above configuration, first, the traveling carriage 43 is moved forward (moved to the left side in FIG. 1), so that the resin discharge nozzle 42 is moved. The rod portion 41 moves until it reaches the first end E1 of the metal tube P located on the side opposite to the insertion side of the resin discharge nozzle 42 and the rod portion 41. Next, while the resin is being discharged from the resin discharge nozzle 42, the traveling carriage 43 is moved backward (moved to the right in FIG. 1) so that the rod 41 is positioned on the insertion side of the resin discharge nozzle 42 and the rod 41. Retreats toward the second end E2 of the metal tube P (moves in the direction opposite to the insertion direction). When the resin discharge nozzle 42 reaches the second end E2 while discharging the resin, it is possible to apply the resin to the entire inner surface of the metal pipe P.
The moving speed of the resin discharge nozzle 42 and the resin discharge amount of the resin discharge nozzle 42 may be set so that a resin film having a desired thickness can be uniformly formed on the entire inner surface of the metal tube P. The moving speed of the resin discharge nozzle 42 can be changed by, for example, using a variable traveling speed type as the traveling vehicle 43 and adjusting the traveling speed of the traveling vehicle 43. The resin discharge amount of the resin discharge nozzle 42 can be changed, for example, by adjusting the supply amount from a resin supply source.

As a preferable configuration, the inner surface resin coating device 4 of the present embodiment further includes a cleaning nozzle 44 for cleaning the resin discharge nozzle 42.
The resin discharge nozzle 42 shown in FIG. 1 is at a standby position separated from the first end E1 of the metal tube P (separated in the longitudinal direction of the metal tube P) from the second end E2 of the metal tube P. Then, as shown in FIG. 1, the cleaning nozzle 44 is disposed near the standby position of the resin discharge nozzle 42.

FIG. 4 is a side view schematically showing an arrangement state of the cleaning nozzle 44 (a view as seen from a horizontal direction orthogonal to the longitudinal direction of the rod portion 41). The dashed arrow shown in FIG. 4 indicates the discharge direction of the cleaning water.
The cleaning nozzle 44 is disposed above the resin discharge nozzle 42 at the standby position. The cleaning nozzle 44 is connected to a cleaning water supply source (not shown), and discharges the cleaning water toward the resin discharge nozzle 42 below.
After the resin is applied to the inner surface of the metal pipe P by the resin discharge nozzle 42, the traveling carriage 43 is further moved backward, so that the rod portion 41 is further moved, and the resin discharge nozzle 42 reaches the standby position. After the resin discharge nozzle 42 reaches the standby position, the resin discharge nozzle 42 is cleaned by discharging cleaning water from the cleaning nozzle 44 toward the resin discharge nozzle 42.

The metal pipe P on which the resin is applied to the inner surface by the inner surface resin coating device 4 is transported by the lateral feed mechanism 13 of the transport device 1 to a position S3 where the blower 5 is provided.
FIG. 5 is a front view schematically showing a schematic configuration of the lateral feed mechanism 13 (a view as viewed from the longitudinal direction of the metal pipe P).
The transverse feed mechanism 13 moves the metal pipe P in a horizontal direction orthogonal to the longitudinal direction of the metal pipe P at least from a position S2 where the inner surface resin coating device 4 is provided to a position S3 where the blower 5 is provided. It is a mechanism for feeding. The lateral feed mechanism 13 of the present embodiment is configured to further laterally feed the metal pipe P from a position S3 where the blower 5 is provided to a position S4 where natural drying is performed. As shown in FIG. 5, the lateral feed mechanism 13 has a support part 131 and a moving part 132.

  The support portion 131 supports a part of the outer surface of the metal tube P in the longitudinal direction from below. Specifically, the support portion 131 is composed of a pair of support portion pieces 131a and 131b. At the position (position S2 to position S4) where the metal tube P is supported, the support portion 131 is substantially V-shaped by the support portion pieces 131a and 131b. A letter-shaped support surface is formed. The metal pipe P is supported by the substantially V-shaped support surface without being displaced in the lateral feed direction (the direction orthogonal to the longitudinal direction of the metal pipe). The support pieces 131 a and 131 b of the support 131 are attached to the moving part 132. A plurality of pairs (eight pairs in the example shown in FIG. 5) of support portions 131 a and 131 b are attached to the moving portion 132.

  The moving part 132 moves the support part 131 in a horizontal direction orthogonal to the longitudinal direction of the metal tube P. As the moving unit 132, for example, a chain conveyor or a belt conveyor having an endless track (annular shape) can be used. The support pieces 131a and 131b constituting the support 131 are attached to an endless (annular) chain or an endless (annular) belt constituting a chain conveyor or a belt conveyor, and move integrally with the chain or the belt. In the present embodiment, a chain conveyor is used as the moving unit 132. Support portions 131a and 131b are attached to a chain 132a of a moving portion (chain conveyor) 132, and the chain 132a moves by rotating a pulley 132b of the moving portion 132, and the support portions 131a and 131b are also chained. It moves integrally with 132a. Thereby, the metal pipe P supported by the support part 131 (support part pieces 131a and 131b) also moves. The movement of the chain 132a of the moving unit 132 is an intermittent movement in which movement and stop are repeated. In a state where the chain 132a is stopped (the metal pipe P supported by the support portion 131 is also stopped), the application of the resin by the inner surface resin coating device 4 and the blowing by the blower 5 described later are executed.

  The support portion 131 and the moving portion 132 included in the lateral feed mechanism 13 are provided at a plurality of positions (six in the example shown in FIG. 1) along the longitudinal direction of the metal tube P. Thereby, the metal pipe P can be traversed in a stable state.

FIG. 6 is a plan view schematically illustrating a schematic configuration of the blower 5. 6 indicate the direction of air flow.
The blower 5 is a device that blows air into the metal pipe P. As shown in FIG. 1, the blower 5 of the present embodiment is configured such that the pipe end side on the upstream side in the transport direction of the metal pipe P (the transport direction up to the position S1) (the pipe end side on the right side in FIG. 1. (The second end E2 side). As shown in FIG. 6, the blower 5 includes a blower 51, a bellows 52, and a fan 53.

  The blower unit 51 is disposed to face the end of the metal pipe P transported to the position S3. Since the metal pipe P conveyed to the position S3 is supported from below by the support portion 131 shown in FIG. 5, if the outer diameter of the metal pipe P changes, the position of the end of the metal pipe P also moves in the vertical direction. Change. For this reason, the blower 51 is configured to be vertically adjustable so that it can face the ends of the metal pipes P having various outer diameters.

  The wind generated by the fan 53 flows into the blowing section 51 through the bellows section 52 and flows out from the blowing section 51 toward the end of the metal pipe P. Since the wind flowing out of the blower 51 flows into the metal pipe P, the resin applied to the inner surface of the metal pipe P is easily dried.

  The metal pipe P blown by the blower 5 is transported by the lateral feed mechanism 13 of the transporter 1 to a position S4 where natural drying is performed. By stopping the metal tube P at this position S4 for a predetermined period of time (typically, while the subsequent metal tube is coated with resin on its inner surface at the position S2), the metal tube P is coated on the outer surface and inner surface of the metal tube P. The dried resin becomes easier to dry.

  After stopping at the position S4 for a predetermined time, the metal tube P is transported by the lateral transport mechanism 13 onto the transport roller 12 located downstream of the lateral transport mechanism 13 and transported in the longitudinal direction by the transport roller 12. Thereafter, the metal pipes P may be directly conveyed to a drawing machine that performs cold drawing, or may be once conveyed to a conveyance table (not shown), and the plurality of metal pipes P may be conveyed together to the drawing machine. May be.

  The reference position in the longitudinal direction of the metal pipe P at the positions S1 to S4 is based on the pipe end (corresponding to the edge of the second end E2 described above) on the upstream side in the transport direction (the transport direction up to the position S1). And In the example shown in FIG. 1, the pipe P is transported such that the pipe end on the upstream side in the transport direction is located at the position of the imaginary line L indicated by the broken line regardless of the length of the metal pipe P. This makes it easier for the wind flowing out of the blower 5 arranged on the upstream side in the transport direction to flow into the metal pipe P.

According to the resin film forming equipment 100 according to the present embodiment described above, since the metal pipe P is first heated by the heating device 2, the heat of the heated metal pipe P causes the outer surface of the resin pipe to be coated. It is possible to increase the drying speed of the resin applied by the device 3 and the inner surface resin application device 4.
Further, according to the resin film forming equipment 100 according to the present embodiment, after the resin is applied to the outer surface of the metal pipe P by the outer resin coating device 3, the resin is applied to the inner surface of the metal tube P by the inner resin coating device 4. Therefore, the resin applied to the outer surface of the metal tube P is easily dried. For this reason, it is possible to reduce the risk that the resin applied to the outer surface of the metal pipe P will be peeled off during the transportation process.
Further, according to the resin film forming equipment 100 according to the present embodiment, after the resin is applied to the inner surface of the metal pipe P by the inner resin coating device 4, the air is blown into the metal pipe P by the blower 5. For this reason, the resin applied to the inner surface of the metal tube P is easily dried, and the dripping of the resin can be reduced.

  Further, according to the resin film forming equipment 100 according to the present embodiment, the metal pipe P is laterally fed by the horizontal feeding mechanism 13 from the position S2 where the inner surface resin coating device 4 is provided to the position S4 where the natural drying is performed. Then, when the metal pipe P is traversed, the portion of the outer surface of the metal pipe P with which the support portion 131 contacts does not change. For this reason, even if the resin applied to the outer surface of the metal tube P by the outer surface resin coating device 3 is peeled off during transportation (during lateral feeding), the resin stays on a part of the outer surface of the metal tube P that comes into contact with the support portion 131, and When performing cold drawing to the pipe P, seizure hardly occurs.

  Further, according to the resin film forming equipment 100 according to the present embodiment, when the inner surface resin coating device 4 applies the resin to the inner surface of the metal pipe P, the rod portion 41 is more downstream than the resin discharge nozzle 42 in the moving direction. Located on the side. For this reason, there is no danger that the rod portion 41 will come into contact with a portion of the inner surface of the metal tube P after the resin is applied by the resin discharge nozzle 42, and there is also a risk that the resin applied to the inner surface may be peeled off by contact with the rod portion 41. Absent.

  Furthermore, according to the resin film forming equipment 100 according to the present embodiment, the resin is completely applied to the inner surface of the metal pipe P by the resin discharge nozzle 42 that retreats from the first end E1 toward the second end E2. Later, the same retreating operation is continued, and the resin discharge nozzle 42 can be cleaned by the cleaning nozzle 44. Accordingly, clogging of the resin discharge nozzle 42 can be efficiently prevented.

DESCRIPTION OF SYMBOLS 1 ... Conveying device 2 ... Heating device 3 ... Outer surface resin coating device 4 ... Inner surface resin coating device 5 ... Blowing device 11 ... Conveying table 12 ... Conveying roller 13 ... -Lateral feed mechanism 41-Rod 42-Resin discharge nozzle 44-Cleaning nozzle 100-Resin film forming equipment P-Metal tube

Claims (4)

Equipment for forming a resin film for lubrication on the surface of the metal tube before performing cold drawing,
A transfer device for transferring the metal tube,
A heating device that heats the metal tube transported by the transport device,
An outer surface resin coating device that applies a resin to the outer surface of the metal tube transported by the transport device,
An inner surface resin coating device that applies a resin to the inner surface of the metal tube transported by the transport device,
A blower that blows air into the metal pipe conveyed by the conveyance device,
The heating device, the outer resin coating device, the inner resin coating device, and the blowing device are arranged in this order from the upstream to the downstream in the transport direction of the metal pipe by the transport device,
A facility for forming a resin film on a metal tube. The transporting device, at least between the inner surface resin coating device and the blower, comprises a traverse mechanism for traversing the metal tube in a horizontal direction orthogonal to the longitudinal direction of the metal tube,
The traverse mechanism,
A support portion that supports a part of the outer surface in the longitudinal direction of the metal tube from below,
A moving unit that moves the support unit in a horizontal direction perpendicular to the longitudinal direction of the metal tube,
The facility for forming a resin film on a metal tube according to claim 1. The inner surface resin coating device,
A rod portion inserted into the metal tube, and reciprocating in a longitudinal direction of the metal tube;
A resin discharge nozzle attached to the tip of the rod portion and discharging resin to the inner surface of the metal tube,
After the rod moves forward until the resin discharge nozzle reaches the first end of the metal tube located on the side opposite to the insertion side of the resin discharge nozzle and the rod, the rod discharges the resin. By discharging the resin from the resin discharge nozzle while retreating toward the second end of the metal tube positioned on the insertion side of the nozzle and the rod portion, the resin is applied to the inner surface of the metal tube. It is configured,
The resin film forming equipment for a metal pipe according to claim 1 or 2, wherein: The inner surface resin coating device further includes a cleaning nozzle for cleaning the resin discharge nozzle after applying a resin to the inner surface of the metal tube,
The facility for forming a resin film on a metal tube according to claim 3.

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