JPH0216808Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is capable of cutting, for example, by repeatedly bending and cutting the end portion of a long pipe over a set length.
As shown in FIG. 5, adjacent straight pipes B of heat exchanger D,
A machine for manufacturing a plurality of curved pipes such as a U-shaped pipe C that connects the B ends, specifically, a device that feeds a long pipe from one end in the longitudinal direction to a bending cutting point equipped with a bending mold, By moving along the circumferential surface of the bending die, the end portion extending from one end of the long tube supplied to the bending cut point over a set length is pressed against the circumferential surface of the bending die, and the end portion of the tube is pressed against the circumferential surface of the bending die. A pressing mold that bends the pipe into a curved shape along the curve, and a pressing mold that moves together with the pressing mold while being inserted into the pipe end from one end side, prevents deformation of the pipe end in the radial direction during bending. Relating to a pipe bending and cutting machine equipped with a shape-retaining member and a device for cutting a long pipe so as to separate a pipe portion including a bent pipe end portion at a pipe portion separated from one end of the long pipe by a set distance. .

[Prior art]

Conventional pipe bending and cutting machines of this type have problems caused by chips generated during cutting getting into the long pipe. This may cause buckling of the shape-retaining member, causing deformation and damage to the shape-retaining member.As the shape-retaining member is inserted into the pipe, chips inside the pipe may be strongly pressed against the inner circumferential surface of the pipe. This may cause cuts on the inner circumferential surface of the tube or cuts (cracks) in the tube, and chips adhering to the inner circumferential surface of the tube may peel off during subsequent use of the curved tube, making it impossible to use it in a heat exchanger. In some cases, in order to prevent damage to the pump or clogging, etc., air is blown from the other end of the long pipe, and this blown air removes chips that have entered the long pipe at one end. It was designed to be excluded.

[Problem that the invention attempts to solve]

However, when using the conventional machine, a large pressure loss is unavoidable, and unless air is blown with high pressure from the other end of the long pipe, the wind pressure at one end of the long pipe is sufficient to remove chips. , because it is not possible to obtain the desired wind speed, especially in the case of large-diameter pipes that require a large amount of blown air, a very large-capacity air blowing device is required, resulting in lower initial costs and running costs. is very expensive. Moreover, if the rotating cutting blade of the cutting device is thin,
The rotating cutting blade bends due to the flow pressure of the air for removing chips, making it impossible to cut the pipe straight. The thickness of the rotary cutting blade becomes unduly large, leading to an increase in the amount of chips generated and a deterioration in yield.

The purpose of the present invention is to overcome these conventional drawbacks.

[Means to solve the problem]

The characteristic structure of the pipe bending and cutting machine according to the present invention is that the member for closing the long pipe is pressed by the shape-retaining member that is inserted and moved within the pipe end portion, and is slid to a position slightly above the cutting position. The operation and effects are as follows.

[Effect]

In other words, the closing member slidingly positioned on the upper side of the supply side of the long tube than the cutting position can prevent chips from entering the long tube. Blowing into the pipe, that is, no air blowing device is required, and the rotating cutting blade can be made thinner by eliminating the bending of the rotating cutting blade due to the blown air. Moreover, although the closing member is located on the downstream side of the cutting position due to the feeding of the long tube after cutting, the shape-retaining member is inserted and moved into the tube after feeding and before cutting. By using the motion to slide the closing member to a position slightly above the supply position than the cutting position, the closing member is prevented from being cut when the tube is cut, so that each cut on a long tube is avoided. In each case, the closing member can prevent chips from entering the long tube, and the closing member can be made short and inexpensive and easy to insert (initial setting) into the long tube.

[Effect of idea]

Therefore, the present invention has been able to provide a pipe bending and cutting machine that can economically prevent chips from entering a long pipe, and also allows easy preliminary work to prevent the chips from entering.

〔Example〕

As shown in Fig. 5, juxtaposed fins A...a plurality of straight pipes B, which are arranged parallel to each other while penetrating the group, and the ends of adjacent straight pipes B, B... are connected in communication with each other. This is a machine used for manufacturing a U-shaped bent tube represented by the U-shaped tube C in a Finch-Uve heat exchanger D consisting of a U-shaped tube C. As shown,
A plurality of reels 1...each of the long tubes 2 wound up and housed in each...chuck 3A, which can clamp and release the intermediate portion, is moved toward one end in the longitudinal direction of the tube via the cylinder 3B while clamping the chuck 3A. Thereby, a device 3 for feeding each long tube 2 . . . from a reel 1 . A device 4 that bends the end portion 2A over a set length from one end into a U-shape, and a rotating cutting blade 5B driven by a motor 5A,
A cutting device 5 is provided to cut the long tube 2 so as to separate the tube end portions 2A bent into a U-shape.

In other words, one end of the long tube 2... is supplied to the bending/cutting location, and the supplied tube end portion 2A... is
By bending the U-shaped tube into a shape and cutting the U-shaped tube end portion 2A..., a U-shaped bent tube is produced, and by repeating this process, a plurality of U-shaped bent tubes are made from the long tube 2... It is configured to make.

As shown in FIGS. 1 to 4, the bending device 4 includes a bending die 7 having a bending guide circumferential surface 7a for each of the long tubes 2, and a bending guide circumferential surface 7a.
By moving half a rotation along ......, the supply tube end portions 2A... are pressed against the bending guide circumferential surface 7a... to bend each tube end portion 2A... into a U-shape along the bending guide circumferential surface 7a... a pressing mold 8 which is bent into a shape, and a pressing mold 8 which is inserted into the tube end portion 2A from one end side.
Shape retaining members 9 move integrally with the tube end portions 9 to prevent deformation of the tube end portions 2A in the radial direction during bending.

The pressing die 8 and the shape retaining member 9 are connected to gears 10 and 1.
A swing frame 12 that is driven to swing back and forth around the axis X of the bending die 7 by a cylinder 11 via a shaft 0′;
The shape-retaining member 9 is attached to be movable in the longitudinal direction (that is, the insertion/extraction direction with respect to the pipe), and the swing frame 1
The pressing die 8 and the shape retaining member 9 are moved together by the swinging of the swinging frame 12.
2, in other words, the pressing die 8 is brought into contact with the tube end portion 2A, and the shape retaining member 9 is inserted into the tube end portion 2A.
A cylinder 13 is provided for switching and fixing the pipe to a non-operating position where the pipe is separated from the tube end portion 2A.

Then, the long tube 2 is inserted into the long tube 2.
A member 14 made of an oil-resistant elastic material (rubber, etc.) that closes the
is provided in such a state that it is pressed by the shape retaining member 9 inserted and moved inside the tube end portion 2A and slides to a position slightly above the supplying position P than the cutting position P, and then, when cutting, the closing member 14 cuts It is constructed to prevent chips generated during this process from entering into the long tube 2.

15 is a long tube 2 fed out from the reel 1...
It is a device that corrects ... into a straight posture, and 16...
is a rod that pushes out and separates the U-shaped tube end portion 2A crimped to the bending guide circumferential surface 7a by inserting it through the through hole 7b formed in the bending mold 7, and these rods 17. 18 is a nozzle that blows out air to blow off chips attached to the bending die 7.

The bending and cutting operation will be briefly explained based on FIGS. 3A to 3F.

(A) As shown in FIG. 3A, the long tube 2 is fed to the bending/cutting location. At this time, the shape retaining member 9 is slightly inserted into one end of the long tube 2,
A closure member 14 is located within the tube end portion 2A.

(B) As shown in FIG. 3B, the pressing die 8 and the shape retaining member 9 move to the operating position. As a result, the closing member 14 is pushed to a position slightly on the upper side of the supply side than the cutting position P.

(C) As shown in FIG. 3C, the pressing die 8 and the shape retaining member 9 swing, and the tube end portion 2A is bent into a U-shape.

(D) As shown in FIG. 3D, the pressing mold 8 and the shape retaining member 9 move to the non-operating position.

(E) As shown in FIG. 3E, the cutting device 5 operates to cut.

(F) As shown in FIG. 3F, the rods 16 are pushed out, and the U-shaped tube end portions 2A are separated from the bending die 7.

(G) The pressing die 8 and the shape retaining member 9 return to their original positions.

[Another example]

It is configured to create an L-shaped bent tube.

[Brief explanation of the drawing]

The drawings show an embodiment, and Fig. 1 is a partially cutaway side view of the main part, Fig. 2 is a longitudinal sectional front view of the main part, Fig. 3 A to F are explanatory diagrams of the bending and cutting operation, and Fig. 4 is The overall perspective view, FIG. 5, is a schematic diagram of the heat exchanger. 2... Long tube, 3... Feeding device, 7... Bending mold, 2A... Tube end portion, 8... Pressing mold, 9... Shape retaining member, 5... Cutting device, 14... Closing member .

Claims (1)

[Claims for Utility Model Registration] The long pipe 2 is bent from one end in the longitudinal direction by the mold 7.
By moving along the circumferential surface of the bending die 7, the end portion 2A over a set length is moved from one end of the long tube 2 supplied to the bending/cutting area. a pressing die 8 that presses against the circumferential surface of the bending die 7 to bend the tube end portion 2A into a curved shape along the circumferential surface of the bending die 7; and the tube end portion 2A.
a shape-retaining member 9 that prevents deformation of the tube end portion 2A in the radial direction during bending by moving together with the pressing mold 8 while being inserted from one end side into the long tube 2; In a tube bending and cutting machine equipped with a device 5 for cutting the long tube 2 so as to separate the tube portion including the bent tube end portion 2A at a tube portion separated by a set distance, the long tube 2 is closed. This pipe bending and cutting machine is provided with a member 14 that is slid to a position slightly above the supply position than the cutting position by being pressed by a shape retaining member 9 that is inserted and moved within the pipe end portion 2A. The pipe bending and cutting machine according to claim 1, wherein the closing member 14 is made of an elastic material.