JPH0110128Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention uses a rolling machine that forms bolts with cutting grooves, generally called high-tension bolts, to form a male thread on the outer periphery of a preformed material and simultaneously cut it. This invention relates to an improvement of a rotary screw rolling device for carving grooves for use in a rotary type thread rolling machine.

By the way, as shown in Fig. 1, a cutting groove I is carved into a part of the bolt shaft part H of a bolt used for construction work, etc., and when the tightening force reaches a predetermined value when tightening the nut, A high tension bolt is used in which the tip protrusion J is cut from the groove I, and the cutting groove I is usually formed at the same time as the male thread part K by a rotary thread rolling machine. It is. The depth of the cutting groove is determined by adjusting the grooving die installed on the fixed die side relative to the rotating die, but determining the groove depth affects the function of this type of bolt. Therefore, precision is required, and the adjustments must be made minutely. Conventionally, the advance and retreat of the grooving die is adjusted according to the operator's intuition, and the depth of the groove is varied, for example, by changing the thickness or number of seams to be pressed against the rear portion of the grooving die. Therefore, it is natural that the groove depth cannot be set accurately, and this setting requires considerable skill. In particular, the grooving die is located below the fixed die that forms the male threaded portion K, and the grooving die must be moved forward and backward regardless of the fixed die, making the adjustment structure complicated.

The present invention has been made in view of the above points, and is equipped with a grooving die on the mounting base below the fixed die for thread rolling so as to face the rotating die with a forming gap in between. In order to move the grooving die back and forth, a cam rod that can be moved back and forth in parallel with the axis of the main shaft of the rotary die is provided at the rear of the grooving die of the mounting base, and a rotating shaft for sliding the cam rod back and forth is provided at its upper end. By screwing the dial so that it protrudes from the top of the mounting base, and attaching the groove depth display dial to this rotary shaft so that it rotates integrally, skill is required from the top of the fixed die of the mounting base. It is designed to be easy to operate and also to be able to be adjusted accurately.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 2 to 5. A rotary die 1 is fitted onto a main shaft 2, and is fixed by bolting 4 a retaining ring 3 to the main shaft 2. The rotary die 1 rotates integrally by inputting rotational force to the rotary die 1. A mounting base 7 is fixed to a frame 6 that supports the main shaft 2 via a bearing 5, and a fixed die 8 facing the rotary die 1 and each having an arc shape in plan view and an upper and lower edge portion 9a are mounted on the mounting base 7. A thread forming gap 10 of a required length is formed between these dies 8, 9 and the rotary die 1. Also fixed die 8
The grooving die 9 is fixed to the mounting base 7 via the holding plate 11 by tightening the nut 12a screwed onto the shaft end of the stud bolt 12. Attaching die 9
A pin 14 inserted into the guide 13 is provided at the rear part.
and a cam follower 15 are arranged coaxially, and the rear end of this cam follower 15 is on the side of a cam rod 17 that is inserted into a guide hole 16 formed in the mounting base 7 parallel to the axis of the main shaft 2 so as to be able to slide only up and down. The cam rod 17 is brought into contact with an inclined cam surface 17a which is recessed in the
The die 9 can be pushed out through the cam follower 15 and the pin 14 by the slide. 13a is a set bolt, 15a is a key bolt, and one end 18 of the rotating shaft 18 is attached to the cam rod 17.
a are screwed together, and the shaft 18 passes through a cover plate 19 that closes the upper end of the guide hole 16 and is taken out to the outside.
This rotating shaft 18 can only rotate freely relative to the cover plate 19 by a retaining flange 18b, and has a dial 21 having a collar 20 screwed onto its outer end and having a groove depth display scale 21a engraved on the collar 20. is fixed using a set screw 23, and the collar 20 and dial 21 are held down by a lock nut 22 so that the rotating shaft 18 and dial 21 rotate together. Further, the outer end portion 18c of the rotating shaft 18 projects further outward than the lock nut 22, and is formed with a polygonal portion for engaging a rotating operation tool (not shown).

In the above configuration, a preformed material is fed into the thread forming gap 10 between the rotary die 1 and the fixed die 8, and as the die 1 rotates, the thread rolling process and the groove forming die 9 are performed. Grooving of cutting grooves using the upper edge portion 9a is performed. In order to adjust the depth of the cutting groove in this state, first, an operating tool is engaged with the outer end 18c of the rotary shaft 18, and the shaft 18 is rotated. Then, as described above, the shaft 18 can only rotate, and the cam rod 17 can only slide up and down in the guide hole 16, so the cam rod 17 can be moved by the rotation operation and the direction of the rotation operation. slides in the guide hole 16 in either direction. However, when the cam rod 17 is slid upward from the state shown in FIG. 4, the cam follower 15 whose rear end is in sliding contact with the cam surface 17a of the cam rod 17 is moved forward to the left in the drawing, and this movement is caused by a pin. 14 to the grooving die 9, the grooving die 9 projects with respect to the rotary die 1, and thus the groove depth is adjusted. Further, in order to move the grooving die 9 backward with respect to the rotary die 1, the cam rod 17 is slid downward. Then, a gap is generated between the rear end of the cam follower 15 and the cam surface 17a, and the grooving die is then pressed by the material fed in, causing the grooving die to retreat by the amount of the gap. . On the other hand, when the rotating shaft 18 is operated, the groove depth display dial 21 integrated therein is also rotated. For this reason, if a reference finger point (reading point) is provided around the dial of the mounting base 7, the groove depth can be read from the dial scale 21a corresponding to this finger point, and the groove depth can be set accurately without relying on intuition. I can do it. Note that since edge portions 9a are formed on the top and bottom of the grooving die 9, if the upper edge portion is worn or damaged during use, the grooving die 9 can be turned upside down and the lower edge portion used. Subsequently, grooving can be performed smoothly.

As described above, the present invention is a rotary type thread rolling machine that forms male threads and cutting grooves on a preformed material. The cam rod for operating the grooving die is inserted into the guide hole provided parallel to the axis so that it can only be slid up and down, and the upper end of the cam rod has a mounting base on which the rotating shaft for moving the cam rod up and down is mounted. They are screwed together so as to protrude from the top surface, and a dial with a groove depth display scale engraved on this rotary shaft is attached to rotate together, so the rotary shaft protruding from the top of the mounting base is By simply rotating, the grooving die can be easily adjusted forward or backward through the cam rod, regardless of the other fixed die installed at the top.Furthermore, the movement of the grooving die back and forth is performed by moving the cam rod to the rotation axis. Since this is done by sliding it up and down, it has the effect of allowing fine adjustments to be made.

[Brief explanation of the drawing]

Figure 1 is an external view of the high tension bolt, Figure 2
The figure is a plan view of a rotary screw rolling machine showing an embodiment of the present invention, Figure 3 is a cross-sectional view of the same, Figure 4 is an enlarged view of the main part of Figure 3, and Figure 5 is a display dial section. It is an enlarged external view. 1... Rotating die, 7... Mounting base, 8... Fixed die, 9... Grooving die, 10... Molding gap, 1
7...Cam rod, 18...Rotary shaft, 21...Groove depth display dial.

Claims (1)

[Scope of utility model registration request] A rotating die, a stationary die facing the fixed die with a forming gap in between, and a grooving die provided below the die are mounted on a mounting base so that they can move forward and backward relative to the rotating die, and a male thread is attached to the rod-shaped material. In a device that simultaneously forms cutting grooves, the cam rod for operating the grooving die is slid up and down into a guide hole provided in the mounting base at the rear of the grooving die parallel to the main shaft axis of the rotary die. A dial that can be fitted and inserted into the cam rod, and a rotary shaft that moves the cam rod up and down is threadedly connected to the upper part of the cam rod so that its upper end protrudes from the top surface of the mounting base, and a dial with a groove depth display scale engraved on the rotary shaft. A rotary screw rolling device equipped with a grooving die that is attached to rotate integrally.