JPS58186526A - Thread cutting method - Google Patents

Abstract

PURPOSE:To correctly perform thread cutting, by inserting a cut rod from a window hole into a rod guide hole and cutting a thread through thread cutting hole of a die to easily and correctly align the axial line of the cut rod to the thread cutting hole. CONSTITUTION:A die device is equipped with a die holder 1, die 2, guide spacer 3 and retaining cover 4. A thread cutting hole 11 in a central position and a stopper hole 14 in a required position in an external face are drilled in the die 2. A rod guide hole 16 is drilled in a central part of the spacer 3. A window hole 17 far larger than the hole 16 and 11 is provided opening in the cover 4 while an external thread 18 is formed only to the upper half part in the periphery and a threadless screwing guide part 19 is formed to the bottom half part of the cover 4, further tightening tool fitting holes 20, 20 accepting the point end part of a forked tightening tool are hollowly provided to the upper face of the cover 4. A cut rod 22 is inserted into the hole 16 of the spacer 3 and into the hole 11 under a condition the axial line of the rod is aligned.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a thread cutting method in which a male thread is machined by turning a die. This invention relates to an improvement of a thread cutting method for thread cutting a workpiece zelkova using a threaded hole.

In other words, in the past, the workpiece rod was directly inserted into the 9 threaded holes of the die on the workpiece, so when inserting it, the axis of the workpiece and the thread cutting? LE) It is not easy to align the axes of the die, and the die is fixed to the chair holder using only set screws. The drawback is that it is necessary to prepare a dedicated die holder for each different standard (size).

The present invention eliminates these drawbacks by 9%, so the 4I
First, press one side of the die with a presser foot aiK having a chamber hole through a guide spacer with a keyaki guide hole. It is possible to slide between the old and the old,
The zelkova to be processed is inserted into the upper distribution guide hole through the window hole and threaded with the threaded hole of the die.

Figure tm #'i shows an example of a die device using the actual method of the present invention.91 This die device has a die holder l.
The die 2 is roughly provided with a guide spacer 3 and a presser foot IIA.

- The chair holder 1 has handle mounting portions 6, 6 protruding from the outer layer of the award case 50, and a handle 7.
7 can be attached removably as in the past.

At one end of the Ff4 side of the case 5, there is a dark die seat 8.
However, a jar fixing separation screw 9 is formed at the upper end S (upper opening S) of J#IrkJ in the trench 97, and a set screw hole 10 is also bored at the circumference I&79T level 1 m11.

The die 2 has a threaded hole 11 in the center of a thick circular piece of steel, a number of chip holes 12 around this, a pipe, and a slit 13 on the outside thereof, and a slit 13 on the outer J# surface ygr position. A stop hole 14 is drilled in the hole 110, and a conical guide recess 15 is transferred to the rim of the threaded hole 110 on the 9th side (upper surface).

The kite spacer 3 has a rod guide hole 16 in the center of a thick disk having the same outer diameter as the die 2 or slightly smaller than it.
It has a hole in it. The inner diameter of the zelkova guide hole 16 is approximately the same as the root diameter of the female thread of the threaded hole 11 of the die 2, or slightly more.

The holding amount 4 is determined by opening a chamber hole 1711 in the center of the disk, which is much larger than the zelkova guide hole 16 and the threaded hole 11, and forming a male thread 18t only in the upper half of the outer circumferential surface. is a screw-in 6 guide part 19 without a screw,
Further, a fastening X insertion hole 20.20 is drilled in the top surface to receive the tip of a two-pronged fastener (not shown).

However, when τ and K for thread cutting are determined by inserting the die 2 into the case 5 of the die holder L and fixing it in the same manner as before using the set screw (bolt) 21 screwed into the set screw hole 10rc, By placing the kite spacer 3 on the upper surface of the die 2 and screwing the male screw 18 of the presser foot 114 into the female thread L:9 of the case 5, the die 2
is pressed and held from above by the presser foot 1ii4 via the guide spacer 3. The guide spacer 3 is held in this suppressed manner to the extent that it is not completely fixed, that is,
This is done by forcibly sliding the die 2 and the presser bell 4 and 0 within the case 5.

In this state, the work piece 22 is placed in the window hole 1.
7 into the rod guide hole 16, and then push the die into the threaded hole 11v (yc) to rotate the die holder l.

In this way, the pressurized bale 22 is inserted into the bale guide hole 16 of the guide spacer 3, and is pushed into the threaded hole 11 with its axis aligned therewith. In this pushing, even if the guide spacer 3 is eccentric to the die 2, it is forced to slide so that the axis of the zelkova guide hole 16 and the axis of the threaded hole 11 do not coincide. What you can do is to align the axis of the workpiece 22 with the axis of the threaded hole 11 using the kite spacer 3 in advance, and then push the workpiece 22 into the threaded hole 11.
If the shaft engagement of the work piece 22 with the threaded hole 11 is simple, it is possible to achieve a positive sK match.

Further, the work piece 22 is guided through the keyaki guide hole 16 as described above, and then is further guided through the guide hole 11s15 of the die 2 itself.
Since the guide spacer 3 enters the threaded hole 11 by being guided by the threaded hole 11, the guide spacer 3
When the K is in the biased position where it comes into contact with the $, its guide part 15
It is more preferable to make the lower opening of the salary guide hole 16 large enough to prevent it from coming off.

The work piece 22 guided and pushed into the threaded hole 11 in this way causes the die 2 to rotate together with the die holder 1! During such thread cutting, the die 2 is not only fixed with a set screw 21 but also attached to the presser foot through the kite spacer 3.
Since it feels suppressed and held at 14, there is no wobbling. The prevention of wobbling by using the presser foot II4 is not only possible when using a large die 2 that matches the size of the case 5, but also when using a small die. It is not necessary to hold the yc held in a dice holder of a different size with a die holder of great luck that matches the size, but the dice t1 of multiple types of different sizes are A die holder can be used to firmly hold the die.

Note that the guide spacer 3 is of a size that matches the size of the die 2 (V).

As is clear from the foregoing, according to the thread cutting method of the present invention, the axis of the work piece is aligned with the axis of the threaded hole of the chair in advance with the guide spacer, and then Since the processing rod is pressed into the threaded hole, alignment of the workpiece O@- with the threaded hole is easy and accurate alignment can be achieved.

Moreover, since several types of dies of various sizes can be firmly held by the same die holder, it is possible to economically cut the threads to exactly 11%.

[Brief explanation of the drawing]

The drawings show an example of a die apparatus for carrying out the method of the present invention, and FIG. 1 is a top view of a die holder;
FIG. 3 is a partial plan view showing the case and die cut away, and an enlarged sectional view taken along the line 1-1 in FIG. 1 of the 41st knife. 2... Dining chair, 1... Dice holder, 21...
Set screw, 11... Threaded hole, 16... Keyaki guide hole, 3... Kite spacer, 17... Window hole, 4...
Presser pot. Patent author Elementary school 1) Ryo Mitsuru Elementary School 1) Ei Takashi Elementary School 1) Mitsuhiro Elementary School

Claims (1)

[Claims] In the thread cutting method, in which the die is placed in the die holder, a set screw is added, the die is rotated to the die holder, and the workpiece is threaded with the threaded hole. The zelkova to be processed is held down by a presser foot IiK having a window hole, and the guide spacer is slidable between the die and the presser cage in the die holder. A thread cutting method characterized in that the thread is inserted through the window hole into the above-mentioned bale guide hole and threaded with the above-mentioned threaded hole.