JPH03253Y2 - - Google Patents

Description

[Detailed description of the invention] A. Purpose of the invention (1) Industrial field of application The invention provides first and second side plates facing each other, and third and second side plates facing each other perpendicular to these side plates. The third and fourth side plate parts mutually connect one end of a square pipe having a fourth side plate part and having a rectangular cross section and having notches formed at one ends of the first and second side plate parts. This invention relates to a drawing device for drawing the end of a square pipe so that it is close to the drawing surface.

(2) Prior Art Conventionally, when compressing the end portion of the square pipe, the third and fourth side plate portions are compressed from above and below so as to be close to each other.

(3) Problems that the invention aims to solve However, in the above conventional method, the first and second
Wrinkles appear on the side panels, which is unfavorable in appearance.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a drawing device for the end of a square pipe that reduces the occurrence of wrinkles and provides an excellent appearance.

B. Structure of the invention (1) Means for solving the problem The device of the invention includes a fixed lower mold on which a square pipe is placed with the first and second side plates in a vertical state; an upper mold that can be raised and lowered; a pair of pressing plates that can come into contact with the outer surfaces of the first and second side plate parts and are elastically biased in a direction away from the first and second side plate parts; A core die that has die parts on both sides corresponding to the shape after drawing, and can be inserted into a square pipe from one end by bringing these die parts into contact with the closed ends of both notches; a drive cam that can be moved up and down in conjunction with the upper die, and that presses both pressing plates toward the square pipe when the upper die is lowered prior to drawing processing by the upper die and the lower die; a pusher for pressing the core die toward the other end of the square pipe in synchronization with the drawing process by the upper die and the lower die when the die is lowered;

(2) Action When the upper mold is lowered after placing the square pipe on the lower mold with the upper mold raised, both pressing plates are pressed against the outer surfaces of the third and fourth side plates of the square pipe by the drive cam. Drawing is performed using the upper and lower dies while the core die is pressed against the other end of the square pipe. Therefore, the square pipe is drawn with the inner and outer surfaces of the third and fourth side plate portions being regulated by the core die and both pressing plates.

(3) Embodiment An embodiment of the present invention will be explained below with reference to the drawings. First, in FIGS. A lower mold 3 is fixedly installed for horizontally placing the square pipe P to be processed. Further, support frames 4 and 5 are fixedly disposed on the plate 2 outside both ends of the lower mold 3 along the longitudinal direction of the square pipe P placed on the lower mold 3, and these support frames 4 and 5 In between,
A pair of press plates 6, 6 are rotatably supported around an axis along the longitudinal direction of the square pipe P. Further, a core die 7 is connected to the upper end of one of the support frames 4. Furthermore, an elevating body 8 is disposed above the lower mold 3 and is driven up and down by a drive means (not shown), and a plate 9 is fixed to the lower surface of the elevating body 8. A holder 10 is fixed to the plate 9, an upper die 11 is fixed to the holder 10, and a pair of drive cams 12, 12 and a pusher 13 are integrally provided.

In FIG. 4a, the square pipe P has a first side plate portion 14 and a second side plate portion 15 facing each other, and a third side plate portion 16 and a third side plate portion 16 facing each other perpendicularly to the side plate portions 14 and 15. It has four side plate parts 17 and is formed into a rectangular cross section, and has a semicircular cut 1 at one end of the first and second side plate parts 14 and 15.
8 and 19 are formed in advance.

This square pipe P is joined at an angle to a cylindrical body (not shown) to constitute, for example, a rear frame of a motorcycle. Furthermore, in order to smoothly join the cylindrical body, the rectangular pipe P is narrowed so that the third and fourth side plate parts 16' and 17' are close to each other, as shown in FIG. 4b, using the device of the present invention. One end of ' has a notch of 18', 1
Joining is performed by fitting 9' into the cylindrical body.

The upper surface of the lower mold 3 has a flat surface 20 that is flush with the upper surface of one of the support frames 4 and a flat surface 21 that is flush with the upper surface of the other support frame 5, which slopes downward toward the flat surface 21 side. The sloped surface 22 and the flat surface 21 are connected to each other via a sloped surface 22, and the sloped surface 22 and the flat surface 21 are connected to each other through the slanted surface 22, and the slanted surface 22 and the flat surface 21 are connected to each other through the slanted surface 22.
This corresponds to the shape of the fourth side plate portions 16' and 17'.

The distance between both outer surfaces of the lower mold 3 is set corresponding to the distance between the outer surfaces of the first and second side plate parts 14 and 15 of the square pipe P, and both ends of both support frames 4 and 5 are It protrudes outward from both outer surfaces of the lower die 3. Moreover, between both ends of the support frames 4 and 5, a pair of horizontal support shafts 2 are provided along the longitudinal direction of the square pipe P.
3 and 23 are installed, and the bases or lower portions of both pressing plates 6 and 6 are rotatably supported by their support shafts 23 and 23.

A spring 24 is compressed between the lower mold 3 and the pressing plates 6, 6 on the outer side of each support shaft 23, 23, and the upper parts of both pressing plates 6, 6 are connected to the lower mold 3.
is urged to rotate in the direction away from the Moreover, a notch 25 is provided on the inner side of the lower end of both pressing plates 6, 6 to allow the upper part of these 6, 6 to separate from the lower die 3 by a certain distance. The upper parts of the bodies 6, 6 can be rotated in a direction away from the lower mold 3 until their inner lower ends abut against the lower mold 3. Further, the inner surfaces of both pressing plates 6, 6 can come into contact with both outer surfaces of the lower mold 3,
Both pressing plates 6, 6 can be rotated against the spring force of the spring 24 until they come into contact with both outer surfaces of the lower die 3. Moreover, when the square pipe P is placed on the lower mold 3, the first and second side plate parts 14, 15
The outer surface of is flush with both outer surfaces of the lower mold 3, and when both pressing plates 6, 6 come into contact with the outer surface of the lower mold 3, the first and second side plates 14 of the square pipe P , 15.

The core die 7 is formed to have a rectangular cross section so that it can be inserted into the square pipe P from one end, and its tip is formed in a convex arc shape toward the front so that the upper and lower surfaces are smoothly connected. be done. The width of the portion 7a of the core die 7 near the tip is determined to such an extent that it can come into sliding contact with the inner surfaces of the first and second side plate portions 14, 15 of the square pipe P, and the width of the portion 7b of the core die 7 near the base end is is determined to be the same as the distance between the outer surfaces of the first and second side plate parts 14 and 15. Further, the vertical thickness of the core die 7 is determined in accordance with the opening at one end of the square pipe P obtained by drawing as shown in FIG. 4b. Moreover, on the outside of the connecting part of both parts 7a and 7b in the core die 7, there is a
Semicircular die portions 26, 27 corresponding to the final shapes of the cuts 18', 19' shown in are provided in a protruding manner so as to fit into both the cuts 18, 19 of the square pipe P.

A connecting member 30 is rotatably supported on a bracket 28 provided at the upper end of the support frame 4 by a horizontal shaft 29 perpendicular to the support shaft 23, and this connecting member 30 is connected to the support frame 4. A spring 31 interposed therebetween rotates and urges the core die 7 side to rise. Moreover, the connecting member 30 is rotatable between the inclined position shown in FIG. Concatenated.
That is, when the connecting member 30 is in the inclined position as shown in FIG.
When the core die 7 assumes a horizontal position, the core die 7 comes into contact with the flat surface 20 while moving forward.

The upper mold 11 has a flat surface 32 opposite to the flat surface 20 of the lower mold 3, a flat surface 33 opposite to the flat surface 21 of the lower mold 3, and both flat surfaces that slope upward toward the flat surface 33. Slope 34 connecting between 32 and 33
It has a lower surface consisting of and is fixed to the holder 10 above the lower mold 3.

A pair of drive cams 12, 12 extending downward are integrally provided in the holder 10 on both sides of the upper mold 11, and the inner edges of the lower ends of these drive cams 12, 12 are provided with the drive cams 12, 12 extending outward as they go downward. Each inclined pressing surface 35 is provided. On the other hand, pressure receiving surfaces 36 are provided at the upper outer edges of the pressing plates 6, 6, respectively, and are inclined in correspondence with the pressing surfaces 35. When the elevating body 8 descends while in the open position in the direction away from the lower mold 3, each pressing surface 35 moves against each pressure receiving surface 3.
6, both press plates 6, 6 are rotated in a direction approaching the lower mold 3.

Further, above the support frame 4, the holder 10 is provided with a pusher 13 that can come into contact with the connecting portion between the core die 7 and the connecting member 30.
When the core die 7 descends and presses the connecting portion downward, the core die 7 moves forward.

Moreover, the rotation of the press plates 6, 6 toward the lower mold 3 side is as follows.
This is performed prior to the drawing process performed by the upper mold 11 and the lower mold 3, and the forward movement of the core die 7 is set to be performed in synchronization with the drawing process performed by the upper mold 11 and the lower mold 3.

Next, the operation of this embodiment will be explained with reference to FIGS. 5 and 6. When drawing the square pipe P, the square pipe P is One end of the mold is placed horizontally on the lower mold 3 so that the third side plate portion 16 is in contact with the flat surface 20. At this time, the other end of the square pipe P is also placed horizontally on a mounting table (not shown). Further, the core die 7 is in a horizontal position floating from the flat surface 20, and the die portions 26 and 27 are cut 1
8 and 19, and is inserted into one end of the square pipe P.

When the elevating body 8 is lowered in this state, first the pressing surfaces 35 of both drive cams 12, 12 are pressed against the pressing plates 6, 6.
The press plates 6, 6 are rotationally driven toward the lower die 3 side. As a result, the square pipe P on the lower mold 3
Pressing plates 6,
6 comes into contact.

When the elevating body 8 further descends, the square pipe P is compressed by the upper die 11 and the lower die 3 in a direction in which the third and fourth side plate portions 16 and 17 thereof are brought closer;
In synchronization with this, the pusher 13 presses the connecting portion between the core die 7 and the connecting member 30 downward, and the core die 7
moves forward, and the square pipe P is moved between the inclined surface 22 of the lower mold 3 and the inclined surface 34 of the upper mold 11.

Therefore, the square pipe P is vertically compressed with its first and second side plate portions 14 and 15 sandwiched between the core die 7 and both pressing plates 6 and 6, and is compressed onto the inclined surfaces 22 and 34. Correspondingly, one end of the square pipe P is squeezed. As a result, the first and second side plate portions 14, 15
It is possible to prevent wrinkles as much as possible.

Also, since one end of the square pipe P is squeezed, the square pipe P
attempts to move toward the other end, but this movement is prevented by a stopper (not shown).

C. Effect of the invention As described above, according to the invention, the first square pipe
With the second side plate part sandwiched between the inner core die and the outer pressing plate, the third and fourth side plate parts can be compressed and squeezed in a direction in which they approach each other. A drawn product with an excellent appearance can be obtained by minimizing the occurrence of wrinkles in the first and second side plate parts.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a longitudinal cross-sectional side view before the start of processing, Fig. 2 is a view taken in the direction of the arrows in Fig. 1, and Fig. 3 is a view taken in the direction of the arrows in Fig. 1. Figure 4 shows a square pipe, where a is a perspective view before machining, b is a perspective view after machining, Figure 5 is a longitudinal cross-sectional side view corresponding to Figure 1 after machining is completed, and Figure 6 is a of-
FIG. 3... lower die, 6... press plate, 7... core die,
11... Upper mold, 12... Drive cam, 13... Pusher, 14... First side plate part, 15... Second side plate part, 16... Third side plate part, 17... Fourth side plate part,
18, 19...notch, 26, 27...die part, P...square pipe.

Claims (1)

[Scope of utility model registration request] The first and second side plates are formed to have a rectangular cross section and have first and second side plate portions facing each other and third and fourth side plate portions that are orthogonal to these side plate portions and opposite to each other. A square pipe end drawing device for drawing an end of a square pipe, each having a notch formed at one end thereof, so that the third and fourth side plate portions are close to each other. a fixed lower mold on which a square pipe is placed with the side plate part in a vertical state; an upper mold that can be raised and lowered above the lower mold; a first mold that can abut against the outer surfaces of the first and second side plate parts; and a pair of pressing plates resiliently biased in a direction away from the second side plate part;
A core die that has die parts on both sides corresponding to the shape after drawing of both notches, and can be inserted into a square pipe from one end side by bringing these die parts into contact with the closed ends of both notches; a drive cam that can be moved up and down in conjunction with the upper die, and that presses both of the pressing plates toward the square pipe when the upper die is lowered prior to the drawing process by the upper die and the lower die; ,
A device for drawing an end of a square pipe, comprising: a pusher that presses a core die toward the other end of the square pipe in synchronization with drawing by the upper die and the lower die when the upper die is lowered.