JP4803737B2 - Pipe end processing equipment - Google Patents

Description

  The present invention relates to a processing technique suitable for processing a pipe terminal when manufacturing a frame of a motorcycle, for example.

2. Description of the Related Art Conventionally, in manufacturing a motorcycle frame or the like, for example, a part of both upper and lower surfaces of a pipe terminal may be cut into a semicircular arc shape while being joined to other pipes. At this time, it is easy to cut with a press blade, but if the end of the pipe is simply cut with the press blade, the shape of the pipe around the cut portion will be crushed, and even if it is joined to another pipe and fixed by welding or the like, there will be a gap. Resulting in poor welding (distortion, poor appearance, excessive welding).
Therefore, as a conventional pipe end processing technique, a fixed core and a movable core are inserted into the pipe, and the outer periphery of the pipe is held and positioned by the pad of the holder, and the upper blade and the lower blade are press-cut. Such a technique (for example, refer to Patent Document 1), a fixed core and a movable core are disposed in a tapered introduction hole of a fixed mold and a straight introduction hole of a movable mold, respectively. By pushing the pipe member into each introduction hole, the mold and the core are brought into close contact with the inner and outer surfaces of the pipe, and then the movable die is moved to cut the end of the pipe (for example, (See Patent Document 2).
JP 2002-210610 A JP-A-10-309618

  However, as in the technique of Patent Document 1 and the technique of Patent Document 2, by providing a fixed core and a movable core, or a fixed core and a movable core, and lowering the upper blade and the movable mold, The method of cutting the pipe end by moving the movable core and the movable core downward has a problem that the equipment configuration is complicated, equipment costs are increased, and the processing procedure is complicated.

  Therefore, the present invention has an object to make the shape of the pipe end portion not deformed when the end portion of the pipe is cut into a predetermined shape, the equipment configuration is simple and inexpensive, and the processing procedure is simple. .

  In order to achieve the above object, the present invention provides a pipe end processing apparatus for cutting a part of the upper and lower surfaces of a pipe end, and is inserted into the end of the pipe and has a female blade on the upper surface and a male blade on the lower surface. A core rod, a holding member for holding the core rod, and a press male blade that can be pressed down from above toward the upper surface of the pipe end are provided, and the holding member is arranged so that the upper surface side of the pipe is lowered by the press male blade. After being cut by the above, the lower part of the pipe is cut by the male blade on the lower surface of the core when the lower part is pushed by the pressing part that descends integrally with the press male blade.

That is, in the initial stage of lowering of the press male blade, the upper surface side of the pipe is cut by the press male blade and the female blade of the core, and then pressed by the press male blade that subsequently descends to hold the holding member and the core. If the lower surface side of the pipe is cut with a male blade with a core, the upper and lower surfaces of the pipe are cut with one shot of the press male blade.
Also, a female blade and a male blade are provided on the upper and lower surfaces of the core, and the upper surface of the pipe is cut by lowering the press male blade, which is the upper blade, and the lower surface of the pipe is cut with the male blade of the core. In particular, when cutting the upper surface of the pipe, which tends to deform during processing, the deformation of the periphery of the processed part is suppressed by the action of the core, and when moving the lower surface of the pipe, the moving direction of the male blade is the inside of the pipe. Therefore, deformation around the processing portion can be prevented without providing a holder or lower blade for holding the lower surface of the pipe. For this reason, an equipment configuration can be simplified.

According to the present invention, an air discharge mechanism is provided in the core for discharging the scrap generated when the upper surface side of the pipe is cut with air.
That is, if the upper surface side of the pipe is cut with a press male blade and a female blade with a core, the scrap after cutting remains on the upper portion of the core and interferes with continuous processing. For this reason, if this scrap is discharged | emitted by an air discharge mechanism, it can process continuously, without taking the effort which removes by hand. In addition, since the scrap on the lower surface side falls downward as it is, it does not interfere with continuous processing or the like.

A female blade and a male blade are provided on the upper and lower surfaces of the core that can be inserted into the end of the pipe, and the holding member that holds the core is lowered by being pressed by the pressing part during the lowering of the press male blade. The upper and lower surfaces of the pipe are cut by a one-shot drop of the press male blade, so that deformation such as crushing of the pipe end can be prevented, and in particular, a holder and a lower blade need to be provided. The equipment can be configured simply.
Further, by providing an air discharge mechanism for discharging scrap on the upper surface side of the pipe, continuous processing can be performed.

Embodiments of the present invention will be described with reference to the accompanying drawings.
Here, FIG. 1 is an overall schematic diagram of a pipe terminal processing apparatus according to the present invention, FIG. 2 is an explanatory diagram of a core, (a) is a perspective view, (b) is an explanatory diagram of an air discharge structure, and (c) is FIG. 3 is a front view, FIG. 3 is an explanatory view of an example of a processing mode of a pipe end portion, viewed from the plane direction, FIG. 4 is an explanatory view of a processing method using this apparatus, and FIG.

  The pipe end processing apparatus of the present invention leaves a part of both side surfaces of the pipe end, and when cutting a part on the upper surface side and the lower surface side, the equipment configuration is simple and can be handled easily, and it is crushed around the processing part, etc. It is comprised as an apparatus which does not produce the deformation | transformation.

  That is, the present processing apparatus 1 cuts the upper and lower surfaces of the end of the pipe P along the semicircular arc-shaped cutting part s and leaves part of both side surfaces as the remaining part z as shown in FIG. As shown in FIG. 1, an upper mold 3 that is movable up and down with respect to the lower mold 2, a holding member 5 that is placed on the lower mold 2 via a spring 4, and an upper mold The punch 6 is provided with a press male blade 6a projecting downward and a pressing portion 6c disposed at a position deeper than the press male blade 6a.

  Further, a through hole 5p penetrating left and right is provided in an intermediate portion of the holding member 5, and a core rod 7 is fitted into the through hole 5p. And this core thread 7 has a part 7a exposed to the outside through the through hole 5p.

As shown in FIG. 2, the core rod 7 has a substantially cylindrical tip portion with a part of the upper surface cut off as a small diameter portion 7a. A female blade 10 is formed in contact with it, and a male blade 11 is formed on the lower surface of the small diameter portion 7a.
Further, adjacent to the female blade 10 on the upper surface of the small diameter portion 7a, a groove 13 formed by carving a part of the upper surface is provided continuously, and this groove 13 is provided on the opposite side of the core rod 7 through the large diameter portion. While forming to an edge part, the bottom face is made into the flat part 12. FIG.
When the core thread 7 is mounted in the through hole 5p of the holding member 5, the large diameter portion is fitted into the through hole 5p, and the small diameter portion 7a is exposed to the outside.

  Further, an air discharge mechanism 14 for discharging scrap generated at the time of cutting is provided inside the core rod 7. The air discharge mechanism 14 includes an air hole 16 that passes through the vicinity of the center portion from the proximal end side of the core rod 7 and opens near the upper portion of the male blade 11 on the distal end side, and a female blade from the distal end portion of the small diameter portion 7a. 10, an air hole 17 that opens in a wall surface below 10, a substantially U-shaped air pipe 15 that communicates both air holes 16, 17, and an air source (not shown) that can send air into the air hole 16. The air blown from the air hole 16 on the base end side of the core 7 can be blown out into the groove 13 through the air pipe 15 and the air hole 17.

The processing method by the above processing apparatuses 1 is demonstrated based on FIG.
As shown in FIG. 4A, the end of the pipe P is fitted into the small diameter portion 7 a of the core rod 7 protruding from the holding member 5.
At this time, when the inner upper surface of the pipe P and the small diameter portion 7a are brought into contact with each other, a predetermined amount of gap is formed between the inner lower surface of the pipe P and the small diameter portion 7a.

  Next, the upper mold 2 is lowered. Then, first, the press male blade 6a of the punch 6 comes into contact with the upper surface of the pipe P, and the upper surface side of the pipe P is cut between the press male blade 6a and the female blade 10 of the core rod 7, and thereafter (b). As shown, the pressing portion 6c of the punch 6 comes into contact with the upper surface of the holding member 5 and presses the holding member 5 downward.

For this reason, the holding member 5 is lowered while the lower spring 4 is contracted, and at the same time, the core glass 7 starts to descend. When the small diameter portion 7a of the core rod 7 comes into contact with the inner lower surface of the pipe P, the lower surface side of the pipe P is cut by the male blade 11 as shown in (c).
At this time, since the cutting of the pipe lower surface side by the male blade 11 of the core rod 7 is a movement from the inside of the circle to the outside, even if the outer lower surface of the pipe P is not particularly supported by the lower blade or the like. The end of the pipe P is not easily deformed.

  By the way, when the upper and lower surfaces of the pipe P are cut by the above forming method, the scrap e on the lower surface side of the pipe P falls on the lower mold 2 as it is and does not interfere with the next processing, but the upper scrap e Remains in the groove 13 in the vicinity of the female blade 10 of the core rod 7, which obstructs the next processing. Therefore, the scrap e is removed by the air discharge mechanism 14.

  That is, as shown in FIG. 5, when the upper die 3 is raised and the lower surface of the punch 6 is separated from the scrap e, air is fed from the air hole 16 on the proximal end side of the air discharge mechanism 14 to flatten the groove 13. The scrap e staying on the part 12 can be pushed backward and discharged. For this reason, it can process continuously.

In addition, this invention is not limited to the above embodiments. What has substantially the same configuration as the matters described in the claims of the present invention and exhibits the same operational effects belongs to the technical scope of the present invention.
For example, the specific shape of the cutting part s of the pipe P is an example.

  When processing the end of a pipe, it can be processed with less deformation, and there is no equipment cost, and the processing procedure is simple. For example, a motorcycle that needs to suppress frame distortion and increase frame accuracy This is particularly effective in the technical field of forming a frame.

Overall diagram of pipe end processing apparatus according to the present invention (A) is a perspective view, (b) is an explanatory view of an air discharge structure, and (c) is a front view. Explanatory drawing of an example of processing mode of pipe end Explanatory drawing of processing method using this device Action diagram of air discharge mechanism

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Pipe end processing apparatus, 4 ... Spring, 5 ... Holding member, 6 ... Punch, 6a ... Press male blade, 6c ... Pressing part, 7 ... Core thread, 10 ... Female blade, 11 ... Male blade, 14 ... Air Discharge mechanism, P ... pipe, s ... cutting part, e ... scrap.

Claims (2)

A pipe end processing apparatus for cutting a part of the upper and lower surfaces of a pipe end, and a core inserted into the end of the pipe and having a female blade on the upper surface and a male blade on the lower surface, A holding member that holds the spring and a press male blade that can be pressed down from above toward the upper surface of the pipe end, and the holding member is cut after the upper surface side of the pipe is cut by the lowering of the press male blade. A pipe terminal that is pushed by a pressing part that descends integrally with a male blade and starts to descend, and at the time of this descent, the male blade on the lower surface of the core is configured to cut the lower surface side of the pipe. Processing equipment. The pipe end processing apparatus according to claim 1, wherein the core rod is provided with an air discharge mechanism for discharging scrap generated by cutting the upper surface side of the pipe with air.