JP2007029996A - Method and apparatus for manufacturing short pipe having high cylindrical accuracy - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method and a manufacturing apparatus of a short pipe having high cylindrical accuracy by which the efficient manufacture of the short pipe having the high cylindrical accuracy is made possible without any manual work and in a series of stages and apparatus and the productivity is remarkably improved and further a V-shaped groove which is generated after rounding work of a hoop material is eliminated with high accuracy. <P>SOLUTION: This apparatus is composed of an uncoiler 11 for uncoiling the hoop material 1 and supplying a prescribed amount, a preliminarily forming press 12 for receiving and cutting the hoop material 1 supplied from the uncoiler 11 and performing U-shaped bending work and the rounding work and a swaging machine 17 for swaging a tubular work 4 which is fed from the preliminarily forming press 12. The tubular workpiece 4 is fed into a swaging machine 17 by being pushed along a core bar 18 after making the core bar 18 which is extended from the preliminarily forming press 12 to the inside of the swaging machine 17 into a penetrated state in the preliminarily forming press 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for manufacturing a short tube with high cylindrical accuracy, more specifically, a positioning hollow knock pin used as an automobile part, various machine parts, etc. and a short tube with high cylindrical accuracy from a hoop material. The present invention relates to a cylindrical precision short tube manufacturing method and a manufacturing apparatus therefor.

  In general, the high-precision short pipe is manufactured by using a seam steel pipe as an original pipe, cutting it to a predetermined length through a drawing process, machining it, and centerless polishing the outer diameter part. .

  In the conventional manufacturing method described above, a process for obtaining a material for the short pipe is required by making an original pipe by a pipe making mill using a hoop material and performing a pipe drawing process to a predetermined dimension in the pipe drawing process. Furthermore, each process of cutting, chamfering of both end faces, and centerless processing of the outer diameter is required.

  Each of these processes is independent and requires not only an in-process inventory but also processing by a single facility, resulting in poor production efficiency and limited improvement in productivity. In addition, when the hoop material is rolled up to form a pipe, there is a demand for erasing without reducing accuracy because the butt surface is not in close contact due to the dimensional difference between the inner and outer circumferences.

Japanese Patent Laid-Open No. 11-244936 Japanese Patent Laid-Open No. 2-25281 JP 2003-53424 A Japanese Patent Laid-Open No. 62-187532 Japanese Patent No. 3194262 Japanese Patent Publication No. 7-16739

  As described above, in the case of the conventional method for manufacturing a short tube with high cylindrical accuracy, since each process is independent, there is a problem that the production efficiency is poor, and the present invention does not have such a problem. In other words, it is possible to efficiently manufacture a short tube with high cylindrical accuracy by a series of processes and equipment without requiring manual labor, and thus the productivity can be remarkably improved. It is an object of the present invention to provide a manufacturing method and a manufacturing apparatus for a short tube with high cylindrical accuracy, which can erase a V-shaped groove formed after rounding with high accuracy.

The invention described in claim 1 for solving the above-mentioned problem is a method of manufacturing a short tube with high cylindrical accuracy comprising the following steps.
(1) Step of supplying a hoop material (2) Cutting step of cutting the hoop material into a predetermined length (3) U-shaped bending step of bending a strip cut into a predetermined length into a U-shape (4) Bending into a U-shape (5) Rounding process of rounding the U-shaped workpiece into a cylindrical shape with the mandrel inserted therein (6) Bending into a cylindrical shape Pushing process of pushing the machined cylindrical workpiece to one pitch along the mandrel (7) Finishing step of swaging the cylindrical workpiece fed along the mandrel

  The invention according to claim 3 for solving the above-described problem is an uncoiler that unwinds and supplies a predetermined amount of hoop material, receives the hoop material supplied from the uncoiler, and performs cutting, U-shaped bending and rounding. A preforming press to be performed, and a swaging machine for swaging a cylindrical workpiece sent from the preforming press, the cylindrical workpiece in the preforming press from the preforming press to the swaging machine. An apparatus for producing a short tube with high cylindrical accuracy, wherein a mandrel extending inward is made to be in an internal state and then pushed along the mandrel and fed into the swaging machine.

  In the present invention, in a series of devices, a warp material subjected to end face processing is fixedly fed, cut with a press die, and bent into a U shape, and then a mandrel is passed through the short tube. Since it is manufactured by performing a series of steps of forming into a cylindrical shape and further performing a swaging process, the yield rate is 100%, and the processing apparatus is compact and relatively inexpensive. Moreover, the manufacturing process of the original pipe is not necessary, and facilities such as a cutting machine, a chamfering machine, a centerless cylindrical grinder are unnecessary, and the swaging process is performed by hitting with an internal die. Therefore, there is no continuous occurrence of defective products due to foreign object biting, etc., enabling unattended operation of the device, and the V-shaped groove formed on the butt surface of the hoop material also does not reduce the cylinder accuracy Since it can be erased neatly, the productivity of short pipes with high cylindrical accuracy can be greatly improved.

  The best mode for carrying out the present invention will be described with reference to the accompanying drawings.

The method of manufacturing a short tube with high cylindrical accuracy according to the present invention includes the following steps.
(1) Step of supplying the hoop material 1 (FIG. 1 (A))
(2) Cutting process for cutting the hoop material 1 into a predetermined length (FIG. 1B)
(3) U-shaped bending step of bending the cut strip 2 into a U-shape (FIG. 1C)
(4) A mandrel insertion process in which a U-shaped workpiece 3 curved in a U-shape is pushed and a mandrel is inserted therethrough (5) The U-shaped workpiece 3 is rounded into a cylindrical shape with the mandrel inserted through Rounding process to process (Fig. 1 (D))
(6) Pushing step of pushing the cylindrical workpiece 4 rounded into a cylindrical shape to one pitch along the mandrel (7) Finishing step of swaging the cylindrical workpiece 4 fed along the mandrel (
(Fig. 1 (E))

  The cutting process and the U-shaped bending process can be performed simultaneously.

  2 to 6 show an apparatus for manufacturing a short tube with high cylindrical accuracy according to the present invention for carrying out the above manufacturing method, and FIG. 2 is a plan view showing the entire configuration thereof. In the figure, 11 is an uncoiler, which holds the hoop material 1 and unwinds it by a necessary amount. Since the structure of the uncoiler 11 is general, detailed description is abbreviate | omitted.

  Reference numeral 12 denotes a preforming press, which is a cut portion 13 that cuts the hoop material 1 that is fed out into a predetermined length, a bending portion 14 that curves the cut strip 2 into a U shape, and a bent portion into a U shape. A pusher 16 that pushes the processed U-shaped workpiece 3 so that the mandrel 18 is in an inside state, and a rounding process that rounds the U-shaped workpiece 3 with the mandrel 18 inserted into a cylindrical shape. Part 15.

  Reference numeral 17 denotes a swaging machine that receives the cylindrical workpiece 4 that is pushed along the mandrel 18 by the action of the pusher 16 and swipes it to finish it into a finished product. As will be described in detail later, the swaging machine 17 is a machine for hitting the cylindrical workpiece 4 with a forming die arranged so as to surround the outer peripheral surface of the cylindrical workpiece 4 and plastically deforming the cylindrical workpiece 4. .

  3 and 4 show the details of the preforming press 12, in which 21 is a column that is erected on a base 22, on which a ram plate 23 is installed so as to be movable up and down. The ram plate 23 is attached with a shearing punch 24 constituting the cutting part 13, a U-shaped bending punch 25 constituting the bending part 14, and an R-bending punch 26 constituting the rounding part 15. On 22, a shearing die 27 for receiving the shearing punch 24 and a bending die 28 for receiving the U-shaped bending punch 25 and the R-bending punch 26 are installed.

  The tip of the hoop material 1 supplied via the uncoiler 11 is first positioned on the shearing die 27 and cut by a predetermined length by the shearing punch 24 to form a predetermined band material 2. The band material 2 is pushed by the pusher 16 in a direction perpendicular to the supply direction of the hoop material 1, positioned on the U-shaped hole of the bending die 28, and then moved into the U-shaped hole by the action of the U-shaped bending punch 25. Is bent into a U-shape to form a U-shaped workpiece 3 (see FIGS. 4 and 5).

  The U-shaped work 3 is pushed in the horizontal direction by the action of the pusher 16 and advances in a transverse groove formed in the bending die 28 so as to be continuous with the U-shaped hole. The part is fixed to the upper part of the bending die 28 and is disposed in a cantilever state, and the U-shaped work 3 advances so as to surround the mandrel 18 and the mandrel 18 is passed through the inside thereof. The process proceeds further (see FIG. 5).

  In this state, the U-shaped work 3 arrives under the R-bending punch 26, where the R-bending punch 26 descends and acts on both end portions of the U-shaped work 3 that is opened upward, whereby the U-shaped work 3 is moved. 3 is rounded so as to be wound around the mandrel 18, and both ends are abutted to form the cylindrical workpiece 4. At this stage, both end surfaces of the cylindrical workpiece 4 are not in close contact with each other, and the outer peripheral side is separated to form a V-shaped groove.

  The cylindrical workpiece 4 wound around the mandrel 18 is pushed by the U-shaped workpiece 3 which is successively pushed in by the pusher 16 and is continuously fed toward the swaging machine 17 (see FIG. 5).

  Next, the configuration of the swaging machine 17 will be described with reference to FIGS. The swaging machine 17 includes an inner case 34 that is rotatably driven by a motor 32 via a belt 33 in an outer case 31 that is supported by a thrust bearing 35.

  A large number of forming dies 36 are arranged in the radial direction with respect to the traveling axis of the cylindrical work 4 on the end face of the inner case 34 (the side on which the left cylindrical work 4 is fed in FIG. 6). The The molding die 36 is fitted into a recess between the fan-shaped protrusions 37 and 37 that are annularly arranged at predetermined intervals on the inlet side end surface of the inner case 34.

  Each of the forming dies 36 is supported so as to be finely movable in the axial direction by being slidably held by a flange plate 38 fixed to the fan-shaped protrusion 37 on the side surface. An inner ring of a radial bearing 39 having an outer ring fitted in the outer case 31 is fixed to the flange plate 38. The fan-shaped protrusion 37 and the outer peripheral surface side of the forming die 36 are supported by a needle bearing 40.

  FIG. 8 shows a configuration example of the forming die 36, which is composed of a backer 41 located on the outer peripheral side and a die 42 located on the inner peripheral side. The backer 41 and the die 42 are in contact with each other and are not fixed to each other. A reinforced metal 43 is embedded in the outer peripheral surface of the backer 41 that contacts the needle bearing 40. The tip surface 42a of the die 42 that contacts the cylindrical workpiece 4 is in a state of being recessed in a curved surface, and a large number (eight in the illustrated example) of the tip surfaces 42a face each other centripetally so that the cylindrical processing hole 44 is formed. The core 18 is formed and extends to the back end of the processing hole 44 or to a position slightly beyond the back end.

  The cylindrical workpiece 4 fed into the swaging machine 17 having the above-described configuration is pushed into the machining hole 44 while being supported by the mandrel 18, and the outer peripheral surface thereof vibrates slightly toward the axis while rotating at high speed. The inner peripheral surface is plastically deformed by being received by the core 18 and the V-shaped groove on the butt end surface gradually disappears, and a high-precision short tube is manufactured. Go.

  A work receiving head 45 is preferably installed in the inner case 34 (see FIG. 10). For example, the workpiece receiving head 45 is a member in which four divided members are connected in a ring shape to form a cylindrical shape and communicate with the machining hole 44. A band 46 is fitted in a circumferential groove formed in each divided member. The inner diameter is slightly expandable.

  The workpiece receiving head 45 supports a portion protruding from the machining hole 44 of the cylindrical workpiece 4, in other words, a portion removed from the mandrel 18 during the swaging process, and suppresses the self-running of the cylindrical workpiece 4. At the same time, it functions as a discharge guide.

  The finished product 5 finished after the swaging process is discharged from the work receiving head 45 through the passage 47 of the inner case 34 and collected.

  Although the present invention has been described in some detail with respect to its most preferred embodiments, it will be apparent that a wide variety of different embodiments can be constructed without departing from the spirit and scope of the invention, the invention being defined by the appended claims. It is not restricted to the specific embodiment other than limiting in.

It is a figure which shows each process of the manufacturing method of the high cylindrical precision short tube which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall configuration diagram of a high-cylindrical precision short pipe manufacturing apparatus according to the present invention. It is a side view of the preforming press in the manufacturing apparatus of the short tube of the high cylinder precision which concerns on this invention. It is a front view of the preforming press in the manufacturing apparatus of the short tube of the high cylinder precision which concerns on this invention. It is a figure which shows the manufacturing method of a U-shaped member and a cylindrical member. It is a longitudinal cross-sectional view which shows the structure of the swaging machine in the manufacturing apparatus of the high-cylindrical precision short tube which concerns on this invention. It is a partially cutaway side view which shows the manufacturing apparatus of the high-cylindrical precision short tube which concerns on this invention. It is a figure which shows the shaping | molding die in the swaging machine in the manufacturing apparatus of the short pipe | tube of the high cylinder precision which concerns on this invention. It is a figure which shows the relationship between the shaping | molding die | dye and the mandrel in the swaging machine in the manufacturing apparatus of the high cylindrical precision short tube which concerns on this invention. It is sectional drawing which shows the workpiece | work receiving head in the swaging machine in the manufacturing apparatus of the high cylindrical precision short tube which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hoop material 2 Strip | belt material 3 U-shaped workpiece | work 4 Cylindrical workpiece | work 5 Finished product 11 Uncoiler 12 Preforming press 13 Cutting part 14 Curved part 15 Rounding part 16 Pusher 17 Swaging machine 18 Core metal 21 Strut 22 Base 23 Ram plate 24 shearing punch 25 U-shaped bending punch 26 R bending punch 27 shearing die 28 bending die 31 outer case 32 motor 33 belt 34 inner case 35 thrust bearing 36 die 37 fan-shaped projection 38 flange plate 39 bearing 40 needle bearing 41 backer 42 die 42a Tip surface 43 Reinforced metal 44 Processing hole 45 Work receiving head 46 Band

Claims (6)

A method of manufacturing a short tube with high cylindrical accuracy, comprising the following steps.
(1) A step of supplying a hoop material (2) A cutting step of cutting the hoop material into a predetermined length (3) A U-shaped bending step of bending a strip cut into a predetermined length into a U shape (4) Bending into a U shape A mandrel insertion process for pushing the U-shaped workpiece and inserting the mandrel therethrough (5) A rounding process for rounding the U-shaped workpiece into a cylindrical shape with the mandrel inserted through ( 6) Pushing process for pushing a cylindrical workpiece rounded into a cylindrical shape to one pitch along the mandrel (7) Finishing step for swaging the cylindrical workpiece fed along the mandrel   The method of manufacturing a short tube with high cylindrical accuracy according to claim 1, wherein the cutting step and the U-shaped bending step are performed simultaneously.   An uncoiler that unwinds and supplies a predetermined amount of hoop material, a preforming press that receives the hoop material supplied from the uncoiler, performs cutting, U-shaped bending and rounding, and a cylinder sent from the preforming press A swaging machine for swaging a workpiece, and the cylindrical workpiece is formed in the preforming press after the mandrel extending from the preforming press to the swaging machine is in an internal state. The apparatus for producing a short tube with high cylindrical accuracy, wherein the apparatus is pushed along the sway and fed into the swaging machine.   The short mandrel manufacturing apparatus according to claim 3, wherein the mandrel is suspended in a cantilevered manner by a bending die of a bending portion of the preforming press.   The high-cylindrical short tube according to claim 3, wherein the swaging process in the swaging machine is performed by a forming die that is arranged in a radial direction with respect to the traveling axis of the cylindrical workpiece and rotates at a high speed around the traveling axis. Manufacturing equipment.   The said forming die consists of the backer located in the outer peripheral side, and the die located in an inner peripheral side, and manufactures the short pipe | tube of the high cylinder precision of Claim 5 which strikes a cylindrical workpiece | work in the front end surface of the said die | dye. apparatus.

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