JPH032334Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention (1) Industrial application field The invention is based on the invention in which cuts of different shapes are formed on opposite sides of one end of a square pipe with a rectangular cross section. The present invention relates to an apparatus for cutting the end of a square pipe, which is equipped with a die and a punch for forming the end of a square pipe.

(2) Conventional technology Conventionally, in such processing equipment, a die is inserted into a square pipe and a punch is driven from above the square pipe to form a cut on each side, or a punch is driven inside the square pipe to form a cut on each side. It is made to swing left and right to form cuts on both sides.

(3) Problems to be solved by the invention However, in the case of forming notches on each side of a square pipe, two steps are required to form the notches on both sides, and the square pipe must be turned over. It's complicated. In addition, those that swing the punch inside the square pipe cannot obtain sufficient cutting force because it is not possible to create a sufficient gap between the punch and the square pipe, and the mechanism for swinging the punch from side to side is difficult to obtain. There are problems in that the blades are complicated and the blade alignment is difficult.

The present invention was developed in view of the above circumstances, and is a cutting device for the end of a square pipe that has a simple structure and can simultaneously form both cuts at one end of a square pipe with sufficient cutting force. The purpose is to provide

B. Structure of the invention (1) Means for solving the problems The device of the invention has die parts on both sides with shapes corresponding to both cuts, and is arranged horizontally so as to be inserted into one end of a square pipe. A fixed die that can approach and move away from each die part on both sides of the square pipe in which the die is inserted, in order to perform cutting in cooperation with each die part; A pair of punches elastically biased in the direction of separation; can approach and move away from the die in order to sandwich and position the square pipe between the die and the die on both sides of the square pipe with the die inserted. a pair of side pads elastically biased in a direction away from the die; an elevating body that can be raised and lowered above the die; an elevating body for driving both punches close to the die portion when the elevating body is lowered; a punch drive cam provided on the elevating body; a pad drive cam provided on the elevating body to drive both side pads close to the die before moving the punch toward the die portion when the elevating body is lowered; a die and the punch; and an upper pad provided on the elevating body to sandwich and position the square pipe between it and the die prior to the cutting operation.

(2) Action When the elevating body is lowered with the die inserted into one end of the square pipe, the upper pad and the pair of side pads sandwich and position the square pipe between them, and then both sides of the square pipe are positioned. The punch moves closer to the die side, and cuts are formed on both sides of one end of the square pipe by both die portions of the die and both punches.

(3) Embodiment An embodiment of the present invention will be described below with reference to the drawings. First, in FIGS. 1, 2, and 3, a pedestal 3 is fixedly mounted on a fixed base 1. Further, a die 4 which can be inserted into one end of the square pipe 2 is horizontally and fixedly disposed above the pedestal 3 at a spaced apart position. Furthermore, a pair of punches 5 and 6 and a pair of side pads 7 and 8 are disposed on the base 1 so as to be movable toward and away from the pedestal 3. Above the die 4, an elevating body 9 that is driven up and down by a drive means (not shown) is arranged so as to be able to rise and fall, and this elevating body 9 is provided with punches 5, 6.
a pair of punch driving cams 10 for driving the
11, a pair of pad driving cams 12, 13 for driving the side pads 7, 8, and an upper pad 1.
4 are provided.

In FIG. 4, the square pipe 2 is joined to the cylindrical body 15 in a direction forming an angle α with the axis of the cylindrical body 15 in order to constitute, for example, a rear fork of a motorcycle. In order to fit one end into the side of the cylindrical body 15, semicircular cuts 16, 1 are made by the device of the present invention on one side of one end of the square pipe 2 and on the other side opposite to the one side.
7 is formed. Furthermore, both cuts 16 and 17 are cut along a circle having the same radius centered on the axis 18 of the cylindrical body 15, and the cutting depths d1 and d2 of both cuts 16 and 17 are made from one end of the square pipe 2.
are different from each other. That is, both cuts 16 and 17
The shapes of are different from each other.

Again, in FIGS. 1 to 3, the die 4 is formed to have a rectangular cross section so that it can be inserted into the square pipe 2 from one end, and the die 4 is formed with a square cross section so that the die 4 can be inserted into the square pipe 2 from one end. It is fixed and supported horizontally with a space between it and the top surface. A cylindrical pusher 19 surrounding this die 4 is movable forward (to the right in FIGS. 1 and 2) from a positioning position where it contacts one end surface of the square pipe 2 and positions it. A drive source (not shown) is connected to the pusher 19.

Die portions 22 and 23 are provided on both sides of the die 4 corresponding to the tip of the pusher 19 when in the positioning position, forming die holes 20 and 21 having shapes corresponding to the notches 16 and 17. On the other hand, on the base 1, guide holes 24 and 25 are formed on both sides of the square pipe 2, corresponding to the die parts 22 and 23, and extending in a direction perpendicular to the longitudinal direction of the square pipe 2. Movable bodies 26 and 27, which have protrusions 26a and 27a at their lower ends that fit into guide holes 24 and 25, are slidably arranged so as to be able to approach and move away from die parts 22 and 23. Furthermore, punches 5 and 6 are fixed to the front surface of each movable body 26 and 27 on the side of the die portions 22 and 23 for making cuts in cooperation with the die portions 22 and 23. Furthermore, pressure receiving surfaces 28 and 29 are provided on the upper rear surfaces of each of the movable bodies 26 and 27, respectively, and are inclined downwardly toward the outside. Furthermore, protrusions 26a, 27a
and the inner ends of the guide holes 24 and 25 are provided with a spring 3.
0 and 31 are contracted, and the movable bodies 26 and 27, that is, the punches 5 and 6, are elastically biased in the direction away from the die parts 22 and 23, and the outward movement is caused by the movement outside the guide holes 24 and 25. It is regulated by stoppers 32 and 33 provided on the base 1 corresponding to the ends.

The base 1 is placed between the cradle 3 and the guide holes 24 and 25.
Shute holes 40, 41 are bored in the holes 40, 41 for discharging scrap produced by the cutting action of the die parts 22, 23 and the punches 5, 6. Further, at the closed ends of the die holes 20 and 21, push-out pins 44 and 45, which are resiliently biased outward by springs 42 and 43 interposed between the die 4 and the square pipe 2, are provided. These push-out pins 44 and 45 are disposed so as to be movable in orthogonal directions, and serve to cause the scrap to fall into the chute holes 40 and 41.

Side pads 7 and 8 for sandwiching and positioning the square pipe 2 between the die portions 22 and 23 and the die 4 extend in a direction perpendicular to the longitudinal direction of the square pipe 2, and are attached to the base 1. It is movably arranged on guide rails 34, 35 fixed on both sides of the square pipe 2, and the outermost positions of the side pads 7, 8 are located at the outer ends of the guide rails 34, 35. Stoppers 36 and 37 are provided to protrude. Moreover, each side pad 7, 8 is elastically biased toward the die 4 side by a spring (not shown). In addition, the side pads 7,
Pressure-receiving surfaces 38 and 39 are provided at the upper part of the back surface of 8, respectively, and are inclined downwardly toward the outside.

A pair of punch driving cams 10 and 11 extending downward are integrally provided on the lower surface of the elevating body 9 at a portion corresponding to both moving bodies 26 and 27 on the base 1, and these punch driving cams The pressure receiving surfaces 28 of the movable bodies 26, 27,
29 are provided with inclined pressing surfaces 46 and 47 for sliding contact. Further, a pair of pad driving cams 12, 13 extending downward are integrally provided on the elevating body 9 at portions corresponding to the side pads 7, 8, and these pad driving cams 12, 13 The pressure receiving surfaces 38, 3 of the side pads 7, 8 are located on the inner side of the lower end.
9 are provided with inclined pressing surfaces 48 and 49 for sliding contact. Furthermore, the elevating body 9 has side pads 7,
An upper pad 14 that can come into contact with the upper surface of the square pipe 2 at a position corresponding to the contact position of the square pipe 2 is supported so as to be able to move up and down relative to each other within a limited range. A spring 48 interposed between the two is resiliently biased downward.

Next, the operation of this embodiment will be explained. In a state where the elevating body 9 is ascending, the pusher 19 is stationary at the positioning position, and the square pipe 2 holds the die 4 at one end until its one end comes into contact with the pusher 19. It is placed horizontally above the pedestal 3 by inserting it from the top. At this time, both punches 5, 6 and side pads 7, 8 are separated from the square pipe 2, and the push-out pins 44, 45 are elastically abutted against the inner surface of one end of the square pipe 2.

When the elevating body 9 is lowered in this state, the pad driving cams 12 and 13 first move the pads 7 and 7 on both sides.
8 is driven close to the square pipe 2, and the square pipe 2 is held between the die 4 and the pads 7 and 8 on both sides, and the upper pad 14 is pressed against the upper surface of the square pipe 2. Therefore, the square pipe 2 is firmly supported and fixed to the die 4.

When the elevating body 9 further descends, both punches 5 and 6 are moved to the die portion 2 by the punch driving cams 10 and 11.
Cuts 16 and 17 are formed on both sides of one end of the square pipe 2 by punches 5 and 6 and die portions 22 and 23, respectively.

After the notches 16, 17 are formed, the elevating body 9 rises, and as the elevating body 9 rises, both punches 5, 6 and pads 7, 8 on both sides move toward the square pipe 2.
The scrap is separated from the push-out pins 44 and 45.
is pushed out and discharged into the chute holes 40 and 41. Further, by moving the pusher 19 forward, the square pipe 2 after the cutting is completed is pushed out so as to pull out the die 4.

In the above embodiment, the punches 5 and 6 are moved in a direction perpendicular to the longitudinal direction of the square pipe 2, but in order to tightly join one end of the square pipe 2 to the cylindrical body 15, the notch 16, It is better that the cut surface of the square pipe 2 is inclined from the direction perpendicular to the longitudinal direction of the square pipe 2, and it is also easy to determine the movement direction of the punches 5 and 6 in this way.

C. Effects of the invention As described above, the device of the present invention has a fixed die horizontally arranged to be inserted into one end of a square pipe, which has die portions on both sides with shapes corresponding to both cuts, respectively; In order to perform the cutting process in cooperation with each of the die parts, there is a structure that can approach and move away from each die part on both sides of the square pipe in which the die is inserted, and that springs in the direction away from the die part. a pair of punches that are forced to move toward and away from the die in order to sandwich and position the square pipe between them on both sides of the square pipe with the die inserted, and in a direction that moves away from the die; a pair of side pads elastically biased; an elevating body that can be raised and lowered above the die;
a punch driving cam provided on the elevating body to drive both punches close to the die portion when the elevating body is lowered; A drive cam for the pad provided on the elevating body for close driving; and an upper pad provided on the elevating body for positioning the square pipe by sandwiching it between the die and the die prior to the cutting operation of the die and the punch. By lowering the elevating body once, it is possible to simultaneously form cuts of different shapes on both sides of one end of a square pipe, and the cuts can be processed with sufficient cutting force, and the structure is simple. .

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a cross-sectional plan view, FIG. 2 is a sectional view taken along the - line in FIG. 1, and FIG. 3 is a longitudinal sectional view taken along the - line in FIG.
FIG. 4 is a side view showing how the square pipe is joined to the cylindrical body. 2... Square pipe, 4... Die, 5, 6... Punch, 7, 8... Side pad, 9... Lifting body, 1
0,11...Punch driving cam, 13,14...
Pad drive cam, 14... Upper pad, 16,
17...notch, 22, 23...die part.

Claims (1)

[Scope of utility model registration request] In a square pipe end notch processing device that is equipped with a die and a punch for working together to form cuts of different shapes on both opposing sides of one end of a square pipe with a square cross section, a double cut is used. a fixed die having die portions of shapes corresponding to the respective shapes on both sides and disposed horizontally so as to be inserted into one end of the square pipe; and a fixed die having die portions having shapes corresponding to the respective shapes; and a fixed die disposed horizontally to be inserted into one end of the square pipe; A pair of punches that can approach and move away from each die part on both sides of the square pipe with the die inserted, and elastically biased in a direction away from the die part; a pair of side pads that can approach and move away from the die and are elastically biased in a direction away from the die in order to sandwich and position the square pipe between the die and the die on both sides of the pipe; an elevating body that can be raised and lowered above; a punch driving cam provided on the elevating body to drive both punches close to the die portion when the elevating body is lowered; A drive cam for the pads is provided on the elevating body to drive the pads on both sides close to the die prior to movement; and an elevating body for positioning the square pipe by sandwiching it between the die and the die prior to the cutting operation of the die and punch. An apparatus for cutting an end of a square pipe, comprising: an upper pad provided at the end of the square pipe;