JP3368357B2 - Pipe drilling machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine for making holes in a pipe used for a hanger of a conveyor, for example. [0002] As a processing machine of this type, a drilling tool such as a drill or a hoso is known. [0003] Drilling using a drilling machine as described above is cumbersome and inefficient. An object of the present invention is to provide a pipe boring machine capable of efficiently boring a pipe. [0005] A pipe drilling machine according to the present invention comprises two pairs of dies and a punch, and a pipe to be machined such that dies are mounted on both sides and cover the dies. It has a die hold bar to be fitted and a pair of punch hold bars which are opposed to both side surfaces of the die hold bar with a work pipe insertion gap therebetween and both punches are respectively attached to both dies. And a die set for integrally connecting the die hold bar and both punch hold bars, and supporting means for supporting the die set movably in the punch moving direction. In the pipe drilling machine according to the present invention, there are provided two pairs of dies and a punch, and a die holder on which the dies are mounted on both sides and the pipe to be processed is fitted so as to cover the dies. A pair of punch hold bars that are opposed to both side surfaces of the bar and the die hold bar with a work pipe insertion gap therebetween and that both punches are respectively attached to the two dies; And a die set that integrally connects both punch hold bars, so fit the pipe to be processed onto the die hold bar,
When the two dies are pressed so as to sandwich them, holes are formed on both side walls of the pipe to be processed by the two dies and the punch. Further, since the punching machine is provided with a supporting means for supporting the die set movably in the punch moving direction, even if an eccentric load is applied to both punches, the eccentric load is reduced. Since the die set is moved so as to be equalized, no excessive force is applied to the die set. An embodiment of the present invention will be described below with reference to the drawings. In the following description, the front and rear means that the lower side of FIG. 2 is the front, the opposite side is the rear, and the left and right means that the left and right sides are the left and right toward the rear. The pipe to be processed P is a rectangular tube having a rectangular cross section and a uniform rectangular cross section. The pipe drilling machine is composed of two pairs of dies 11
And a punch 12, an E-shaped die set 13 for holding them in a predetermined positional relationship, and a substantially inverted T-shaped substrate.
A pair of guide rails 16 are provided on the upper surface and extend in the left-right direction and support the die set 13 via a sliding guide member 15. The die set 13 includes a forwardly extending horizontal square rod-shaped die hold bar 21 and a pair of forwardly extending horizontal square rods which are opposed to both left and right side surfaces of the die hold bar 21 with a pipe insertion gap therebetween. The punch hold bar 22 includes a die hold bar 21 and a connecting bar 23 extending in the left-right direction connecting the rear ends of the punch hold bars 22. Although the upper surfaces of both punch hold bars 22 and the connecting bar 23 are flush with each other, the upper surface of the die hole bar 21 is formed lower than both upper surfaces by a height corresponding to the thickness of the pipe P (FIG. 4). reference). A punching hole 24 is provided near the front end of the die hold bar 21 so as to penetrate the die in the left and right direction. In addition, a long hole-shaped punching waste discharge hole 25 extending downward and forward from the punching hole 24 is provided. Near the front ends of both punch hold bars 22,
Punch holding holes 26 are provided concentrically with the punching holes 24, respectively. The left and right punches 12 are respectively slidably fitted into the two punch holding holes 26 via horizontal tubular pipe retainers 27. The left and right punches 12 and the pipe presser 27 have different structures in the left and right directions, but have the same structure. Therefore, only the right punch 12 and the pipe presser 27 will be described below. The punch 12 has the conical cutting blade side facing left,
A step 12a is provided on the outer peripheral edge of the cutting blade . A flange 31 is provided at the right end of the outer surface of the pipe retainer 27, and a stopper screw 32 is screwed into the flange 31. A sliding guide cylinder 34 with a right end closing wall 33 is interposed in the right half of the punch 12 and the pipe retainer 27, and penetrates through the closing wall 33 to form a screw portion 36 of a bolt 35 on the right end surface of the punch 12.
Is screwed. The head 37 of the bolt 35 is covered with a tubular spring receiver 38. The head on the inner left end of the spring receiver 38
An inward flange 41 engaged with 37 is provided,
An outward flange 42 is provided at the right end of the outer surface.
A plurality of disc springs 43 are interposed between the pipe presser 27 and the outward flange 42 so as to surround the bolt 35 and the spring receiver 38. A leftward pressure is applied to the bolt 35 and the spring receiver 38 by a press mechanism. The press mechanism is
The press bar 51 includes a press bar 51 attached to a slide of a press body (not shown) and extending in the left-right direction, and a conversion unit 52 that converts a downward pressing force of the press bar 51 into a leftward pressing force. The conversion unit 52 includes an upward input section 53 positioned below the right end of the press bar 51, and a left output section abutted on the head 37 and the spring receiver 38 of the bolt 35.
Has 54. A notch 61 is provided in the middle of the length of the connecting bar 23 so that the bottom surface thereof is flush with the upper surface of the die hold bar 21. The push bar 62 and a sliding guide member 63 sandwiching the push bar 62 from the left and right directions are fitted into the notch 61 so that the push bar 62 can be received on the bottom surface of the notch 61. Push bar 62
Is connected to a piston rod of a hydraulic cylinder 64 which is attached to the rear surface of the connecting bar 23 in a forward direction. The procedure for drilling is as follows. First, the pipe P to be processed is fitted over the die hold bar 21. Next, the press bar 51 is lowered to press the input units 53 of the left and right conversion units 52 downward. Then, the output unit 54 of the right conversion unit 52 is projected leftward, and the output unit 54 of the left conversion unit 52 is projected rightward,
As a result, the left and right punches 12 are moved via the bolts 35 together with the pipe retainer 27 so as to approach the pipe P to be processed. Eventually, the left and right pipe retainers 27 are brought into contact with the pipe P to be processed. At this time, one of the left and right pipe retainers 27 is brought into contact with the pipe P to be processed, but the other pipe retainer 27 is brought into contact with the other pipe retainer 27. Assuming that there is a gap between the processing pipes P, the die set 13 is moved left or right until the gap disappears. When the left and right pipe pressers 27 are brought into contact with the pipe P to be processed, and subsequently, the output portions 54 of the left and right conversion units 52 are projected, the disc springs
By compressing 43, only the left and right punches 12 are moved, and two holes on the left and right of the pipe P to be processed are formed. Of the two holes on the left and right,
If the right hole is made first, the step 12a of the right punch 12
The further part enters the right die 11, but the right punch 12
The right die 11 is received by the step 12a.
After that, only the left punch 12 moves, and the left die 11 and
Drill the left hole following the right hole with the left punch 12.
It is. If the left hole is drilled first, the reverse is true.
You. Thereafter, the left and right punches 12 and the pipe presser 27 are returned to their original positions by raising the press bar 51. When the drilling of the pipe P to be processed is completed, the hydraulic cylinder 64 is operated to move the push bar 62 forward, so that the front end face of the push bar 62
And pushes it forward. Then, the perforated portion is moved forward from between the die 11 and the punch 12, and thereafter, the pipe P to be processed is easily pulled out of the die hold bar simply by pulling the pipe P to the front. In the above embodiment, the dies and punches may be attached at a plurality of positions in the longitudinal direction of the die hold bar and the punch hold bar. Then,
Drilling can be easily performed continuously at a plurality of positions in the length direction of the pipe to be processed. According to the present invention, when the pipe to be processed is fitted to the die hold bar and pressed so as to sandwich both dies, holes are formed in both side walls of the pipe to be processed by both dies and punches. This makes it possible to efficiently drill holes in the pipe. Further, even if an unbalanced load is applied to both punches, the die set moves so that the unbalanced load is equalized, so that no excessive force is applied to the die set, so that the die set can be reliably and accurately formed. Can be drilled.

[Brief description of the drawings] FIG. 1 is a perspective view of a drilling machine according to the present invention. FIG. 2 is a plan view of the processing machine. FIG. 3 is an enlarged sectional view taken along the line III-III in FIG. 2; FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2; [Explanation of symbols] 11 dice 12 punches 13 die set 16 Guide rail 21 Dice Hold Bar 22 Punch hold bar

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B21D 28/28 B21D 28/34

Claims (1)

(57) Claims 1. A pair of dies 11 and a punch 12, and a die on which a pipe 11 to be processed is fitted so as to cover the dies 11 with the dies 11 attached to both side surfaces, respectively. It has a pair of punch hold bars 22 which are respectively opposed to both side surfaces of the hold bar 21 and the die hold bar 21 with a gap to be inserted into the pipe to be processed, and to which both punches 12 are respectively attached in correspondence with both dies 11. A die set 13 for integrally connecting the die hold bar 21 and both punch hold bars 22; and a support means 16 for supporting the die set 13 movably in the punch 12 moving direction. Is a pipe drilling machine.