JPH03146233A - Cold working method for device for metallic pipe and pressure resistant vessel - Google Patents

Abstract

PURPOSE:To improve the stability of working in cold forming and working of a metallic pipe by interposing a die between a pair of crank motion pressurizing mechanism and synchronously advancing and retreating the pressurizing mechanism. CONSTITUTION:The die 12 is intermittently pressurized to the metallic pipe 36 by utilizing the crank motion by the rotation of an eccentric pressurizing roller 6 and the die 12 is advanced via a force accumulating mechanism connected to the pressurizing mechanism at every non-pressurization of the die 12. The die operates on the same center line in both the pressurization direction and the advancing direction in this way and, therefore, the stability is good and the continuous working is possible.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method and apparatus for cold working a metal tube, and a pressure vessel.

(Prior Art) Conventionally, a metal tube forming machine is known that forms a metal tube into irregularities by crank motion (Japanese Patent Laid-Open No. 60-96321
issue).

The metal tube forming machine has a mold placed between a pressurizing mechanism using a cold crank motion and a hydraulic mechanism as a reaction force receiver. It is configured to move forward and backward.

(Problems to be Solved by the Invention) In the metal tube forming machine, the mold is disposed between the pressure mechanism using crank motion and the hydraulic mechanism for the reaction force receiver. In this case, only the hydraulic mechanism is advanced, and the input direction of the pressurizing force from the mold is unidirectional. Therefore, although the metal tube is pressurized around the entire circumference,
Since the input direction is unidirectional, noise is inevitably generated due to the vibration of the metal tube, and the metal tube tends to become unstable.

(Means for Solving the Problems) However, the present invention provides a mold between a pair of pressurizing mechanisms using crank motions, and also moves the pressurizing mechanisms forward and backward in synchronization. It solved the problem.

That is, in cold working in which a metal tube is pressure-formed with a die, the metal tube is intermittently pressurized, and the die is moved forward every time the die is not pressurized. This is a method for cold working metal tubes.

In addition, in cold working in which a metal tube is pressure-formed with a mold, the metal tube is intermittently pressurized, and the mold is replaced every time the mold is not pressurized. advance,
The method for cold working a metal tube is characterized in that the metal tube is rotated by a predetermined angle when the mold is not pressurized.

Next, the mold is moved forward by rotating the screw or by repeating the accumulation and release of fluid pressure. , advancement by fluid pressure is based on fluid compression.

Further, the intermittent pressurization of the mold is performed by crank motion caused by rotation of an eccentric roller.

In addition, the invention of the device places a split mold that is supported in a separable manner between two pressurizing mechanisms using crank motion.
The two pressurizing mechanisms are installed in an integrated housing, and a synchronizing mechanism is attached thereto, and the housing is provided with a forward and backward mechanism for the pressurizing mechanism, and a synchronizing mechanism for the forward and backward mechanism is attached. Another invention of the apparatus is a cold working apparatus for metal tubes, which is characterized in that a split mold supported in a separable manner is disposed between two pressurizing mechanisms by crank motion, and the two pressurizing mechanisms are A pressure mechanism is integrally installed in the housing, and a synchronization mechanism is attached thereto, and an advancement/retraction mechanism for the advancement/retraction mechanism is installed in the housing, and a synchronization mechanism for the advancement/retraction mechanism is attached to the housing. This apparatus is characterized in that it is equipped with a metal tube insertion mechanism for inserting the metal tube from a direction perpendicular to the forward and backward direction of the pressure mechanism.

Next, the pressurizing mechanism is configured to be linearly movable via a roller slider on a sliding rectangular tube that is linked to the rotational force of a crank motion, and the forward/backward mechanism has an advancing means by rotating a screw, and a fluid It may be combined with a pressure-based retraction means, or may be a fluid pressure-based forward/retraction means.

Still another invention is a pressure-resistant container characterized by forming a metal tube by cold working, closing the bottom portion, and forming a small-diameter mouth portion.

In the above, since the pressurizing force of the mold is based on crank motion, it is applied intermittently.

In other words, the pressure to pressurize the metal tube with the mold is, for example, about 200 tons, so in order to move the pressurizing mechanism forward during pressurization,
Further, a larger force is required, and a large-capacity motor or a large-capacity hydraulic mechanism is required. Therefore, in the present invention, by moving the pressure mechanism forward during intermittent pressurization by crank motion (when no pressure is applied), the pressure mechanism can be moved forward with a relatively small force. However, in order to instantly move the pressurizing mechanism by capturing the time when no pressure is applied due to the crank motion, a complicated control mechanism is required. By storing the force, the screw can be rotated instantaneously when the pressing force is relaxed, or the push rod can be moved forward instantaneously using fluid pressure. In this way, the problem with the advancement of the pressurizing mechanism was solved.

Similarly to the above, since the metal tube cannot be rotated during pressure molding, it is rotated when the mold becomes slack. Furthermore, since the mold is a split mold, the set mold can maintain the correct position during pressurized processing, but is in a free state when no pressure is applied. Therefore, a mold holding device is provided to keep the mold in constant contact with the guide frame when no pressure is applied.

According to this invention, since the metal tube is cold worked, there is no need to heat the material to be processed unlike in hot working, and the equipment and time involved can be saved.

Therefore, processing efficiency can be significantly improved, and there is no fear of various problems caused by heating (change in material quality, rust formation inside the product, etc.) that occur during hot processing.

(Function) According to the present invention, since the mold is partially pressurized for the same time by the pair of pressurizing mechanisms, the input direction when pressurizing the mold is well balanced, and vibration of the metal tube does not occur during processing. In addition, since the pressure mechanism is connected to the advance/retreat mechanism via the force storage mechanism, the pressure mechanism moves forward instantaneously when no pressure is applied.

Therefore, even if the capacity of the advancing mechanism is relatively small, the purpose can be easily achieved.

(Example 1) Next, an example of the manufacturing method of the present invention will be described.

A steel pipe with a diameter of 165 mm and a thickness of 5 to 6 was inserted between the molds, processed 350 times per minute with a pressure of 200 tons, and when the pressure mechanism was advanced 3 times per second, the pipe had a diameter of 165 mm and a thickness. Sa5
A pressure-resistant container of m+s ~6 mm could be molded in 42 seconds.

(Example 2) An embodiment of the device of this invention will be described.

That is, in FIGS. 1 to 3, the upper and lower frames 1.2
Bearing both ends of the drive shaft 3.3 on both left and right sides of the inner side of the bearing 4.
4, and a pulley 5.5 is fixed to the protrusion on one side of each drive shaft 3.3. A pressure roller 6.6 is eccentrically provided at the center of the drive shaft 3.3. A large number of roller bearings 7. are arranged outside the pressure roller 6.6.
A center hole 9.9 of the sliding rectangular tube 8.8 is loosely fitted into the pressure roller 6.6 through the center hole 9.9 of the square sliding tube 8.8. The inner wall of the sliding rectangular tube 8.8 is connected to the pressure plate 1 via a roller bearing 10.10.
1.11, and the inner wall of the pressure plate 11.11 is formed into a four-piece mold support part 13.13 similar to the outer wall of the mold 12.

The mold 12 has four divided molds 14a, 14b, and 14c.

14d, hydraulic cylinders 15.1 on both front and rear sides.
5, each divided type 14a, 14b, 14C% 14d
I support it. A motor 17.17 is fixed to a supporting frame 16.16 on the left and right outer sides of the upper and lower frames 1.2, protruding laterally, and a rotation shaft 18.18 of the motor 17.17
The inner end of the pressure rod 20 is connected to the rear end of the pressure rod 20 through a coupling 19, and the tip of the pressure rod 20 contacts the outer wall 48 of the reaction force receiver of the sliding rectangular tube 8. Further, a male thread 21 is provided on the outer side of the rear end of the pressure rod 20, and is screwed into a threaded pipe 22 installed horizontally on the support frame 16. Next, a pulley 23 is fixed to the outer end of the rotating shaft 18.18, and a timing belt 26 is attached to the pulley 23 and the pulley 25 of the synchronizing shaft 24.

A mouth-shaped motor stand 27.27 is slidably fitted on the upper part of the frame 1 and on both front and rear sides.
The front and rear sides of the sliding rectangular tube 8.8 have guide housings 45, respectively.
Connect and fix. A motor 28.28 is installed on the motor stand 27.27, a pulley 30 is fixed to one side of the shaft 29 of the motor 28.28, and a belt 31 is attached between the pulley 5 and the pulley 5. Further, the other side of the shaft 29 is connected to a synchronizing shaft 33 via interlocking devices 32 and 32. The synchronous shaft 33 has a spline joint 61 in the center,
It is expandable.

On the front side of the frame 1.2, a material table 34 is laid at right angles to the pressurizing direction of the mold, and a support insertion device 37 for a steel pipe 36 is installed on a rail 35.35 provided on the upper part of the material table 34. ing. A mold mounting table (not shown) is installed on the back side of the frame 1.2. In addition, the support frame 1
On the outer wall of 6.16, four fluid pressure cylinders 38.38 are installed horizontally on the upper, lower, left, and right sides of the motor 17, and the tip of the rod 39.39 of each fluid pressure cylinder 38. The reaction force receiver of the cylinder 8.8 is connected to the outer wall 48 (forming one side of the guide housing 45). In the figure, 40 is a speed reducer, and 41 is a bracket.

The operation of the above embodiment will be explained. First steel pipe 3
After gripping the - side of the steel pipe 36 (material) into the support insertion device 37 of No. 6, the support insertion device 37 is advanced in the direction of arrow 42 to insert the other side of the steel pipe 36 into the mold 12. In this case, since pressurized air is inserted into the tip side of the fluid pressure cylinder 15, the mold 12 is held at the fully open position.

Next, motors 17 and 28 are started. When the motor 17 is started, the rotary shaft 18 rotates in the direction of advancing the pressure rod 20 in the direction of the arrow 43 in FIG. In this case, since the pressure rod 20 is screwed into the screw tube 22, when the screw tube 22 rotates, the pressure rod 20 moves forward in the direction of the arrow 43. Radial arms 44, 44 are provided inside the outer end of the spiral tube 22, and intersect with the radial arm 47 provided at the end of the rotating shaft 18 of the motor 17 in and out, with a rubber piece 46 interposed therebetween. Then, a force storage coupling 19 is formed. In FIG. 5, when the rotating shaft 18 is rotated in the direction of the arrow 49, if the mold is pressurized, the pressure rod 20 is in pressure contact with the outer wall of the sliding rectangular tube 8. Spiral tube 22 does not rotate. Therefore, the rubber piece 46 is compressed by the arm 47 by the rotation angle of the rotating shaft 18. Then, when the contact pressing force of the pressure rod 20' is released, the stored force of the rubber piece 46 is instantly released and the spiral tube 22 is rotated in the direction of the arrow 49, so that the pressure rod 20 is It moves forward in the direction of arrow 43 by the amount of rotational screw feed. When the motor 17 rotates in the opposite direction, the pressure rod 20 has no resistance, so the pressure rod 20 retreats in the direction of the arrow 50 as the spiral tube 22 rotates. In this case, pressurized air (or pressurized oil) is sent to the rod side of the fluid pressure cylinder 38, and the rod 39 is moved as shown by the arrow.
By retracting to the 0 side, the guide housing 45 having the sliding rectangular tube 8 is slid in the same direction. Therefore, as the guide housing 45 of the sliding rectangular tube 8 slides, the mold 12 is also opened, so that the steel pipe 36 can be advanced to the next processing position or removed from the mold 12.

In the above, when the pressure roller is rotated in the direction of arrow 51 in FIG.
The molds 12 are pressurized in the direction of approaching each other (arrows 53 and 54) via the inner end of the pressure platen 11 to process the steel pipe. As described above, since the sliding rectangular tube 8 alternately performs the pressurizing operation and the advancing operation, the steel pipe 36 is sequentially pressurized and processed into a predetermined shape.

(Embodiment 3) When forming the pressure-resistant container 55 shown in FIG. 7 according to the present invention, first, as shown in FIG. Dotted line 5 at 56
By cutting along line 8.59 and providing a screw hole 63 in the opening, a pressure-resistant container 55 as shown in FIG. 7 is completed.

In the third embodiment, the pressure-resistant container is made of two identical steel pipes, but it is of course possible to use one or three pipes.

(Effects of the Invention) According to the present invention, the metal tube is pressurized by the pair of pressurizing mechanisms using a crank motion, and the pair of pressurizing mechanisms are moved forward, so that both the pressurizing direction and the advancing direction are on the same center line. Because of its operation, it has good stability and has the effect of being able to perform continuous processing.

Furthermore, since the advance mechanism is equipped with a force storage mechanism, it has the effect of being able to stop when pressurized and instantaneously move forward when moving forward. Therefore, even if the advancing mechanism has a relatively small capacity, it can be smoothly driven.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the device for implementing the present invention, Fig. 2 is a longitudinal sectional front view with a portion omitted, Fig. 3 is a cross-sectional plan view with a portion omitted as well, and Fig. 4 is a sectional view with a portion omitted as well. FIG. 5 is a partially enlarged longitudinal side view of the power storage coupling, FIG. 6 is a partially enlarged longitudinal front view of the power storage coupling, and FIG. These are an enlarged partial cross-sectional view and a front view of the vessel. 1.2... Frame 4.4... Bearing 6... Pressure roller 8... Sliding square tube 10... Roller bearing 11... Pressure plate 13... Mold support part 15 ... Cylinder 17 ... Motor 19 ... Rubber material 21 ... Male thread 23.25 ... Pulley 26 ... Timing belt 27 ... Motor stand 29 ... Shaft 31 ... Interlocking device 34...Material table 36...Steel tube 3.3...Drive shaft 5.5...Pulley 7...Roller bearing 9...Central hole 12...Mold 14...・Split type 16... Support frame 18... Rotating shaft 20... Pressure rod 22... Screw tube 24... Synchronous shaft 8... Motor 0... Pulley 3... Synchronous shaft 5...Rail 7...Support insertion device Fig. 7 Fig. 8

Claims (1)

[Scope of Claims] 1. In cold working in which a metal tube is pressure-formed using a mold, the metal tube is intermittently pressurized, and the mold is Cold working method 2 for a metal tube characterized by advancing the metal tube.In cold working in which a metal tube is pressure-formed with a mold, the metal tube is intermittently pressurized, and the non-contact of the mold is A method for cold working a metal tube 3, characterized in that the mold is advanced each time pressurization is applied, and the metal tube is rotated by a predetermined angle when the mold is not pressurized.The advancement of the mold is performed by screw rotation. 4. A method for cold working a metal tube according to claim 1 or 2, wherein the cold working method is carried out by repeatedly accumulating and releasing fluid pressure. The forward accumulating force due to screw rotation is achieved by interposing a rubber or a spring in the direction of rotation, A method 5 for cold working a metal tube according to claim 3, wherein the advancement by fluid pressure is performed by compression of the fluid. A method according to claim 1 or 2, wherein the intermittent pressurization of the mold is performed by a kunk motion caused by rotation of an eccentric roller. Cold working method of metal tube 6 Between two pressurizing mechanisms using crank motion,
A split mold supported in a separable manner is arranged, the two pressure mechanisms are installed in an integral housing, a synchronization mechanism is attached, and a forward and backward mechanism for the pressure mechanism is installed in the housing. A metal tube cold working apparatus 7 characterized in that a synchronization mechanism for the forward and backward mechanisms is attached thereto.
A split mold supported in a separable manner is disposed, the two pressure mechanisms are integrally installed in the housing, a synchronization mechanism is attached, and a forward and backward mechanism for the pressure mechanism is installed in the housing. Cold working of a metal tube, characterized in that a synchronization mechanism for the advance/retreat mechanism is attached, and a metal tube insertion mechanism for inserting the metal tube from a direction perpendicular to the advance/retreat direction of the pressurizing mechanism is provided. Apparatus 8: The apparatus for cold working metal tubes according to claim 6 or 7, wherein the pressurizing mechanism is configured to be linearly movable via a roller slider on a sliding rectangular tube that is linked to rotational force by a crank motion. The cold working device 10 according to claim 6 or 7, wherein the advancing means by rotating a screw and the retreating means by fluid pressure are combined, or the advancing and retreating means by fluid pressure is used. A pressure-resistant container characterized by having a closed bottom and a small-diameter mouth.