JPH012729A - Method and device for twisting square bars - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a reamer for dental treatment, etc., in which two parts, each of which holds a square bar with a square or triangular cross section, are subjected to relative torsional movement. The present invention relates to a method and device for twisting a square bar by separating the bars from each other.

[Prior Art] Dental reamers and the like for root canal treatment of teeth have a small diameter (about 1/10 mm to 2 mm diameter), have a square or triangular cross section, and have a tapered part. The square bar 9' has an R-shaped spiral twist, and when manufacturing it, as shown in FIG. ′
For example, by rotating the chuck 11 and gradually moving the vise claw 5' away from the chuck 11, the two holding parts are subjected to a relative torsional movement and separated 1, thereby obtaining a twisted square bar 1). It was something that could be done.

The vise claw 5' holds a part of the square bar 9'.

Changes in the thickness of the square bar should be dealt with continuously depending on the thickness of the square bar or, in the case of a square bar having a tapered part, during the twisting operation. As shown in the figure, a fixed vice claw 5'f is arranged below and a vertically movable vice claw 5'm is arranged above, and the tip of the vice claw 5' presses against the side surface of the square bar 9'. It was a very touching experience.

[Problems to be Solved by the Invention] In the conventional square bar holding means described above, when the thickness of the square bar 9' changes during the twisting operation, the center of the square bar 9' shifts, causing manufacturing problems. Problem with the above or the square bar 9' being pressed
There are many problems such as the tendency for paris to occur on the edges of the
There was a problem in manufacturing a twisted square bar with a constant twist pitch, little variation in precision, and a good surface finish.

The present invention has been made to solve the above-mentioned problems, and the entire circumference of the side surface of the square bar is held with a vise claw, so that it can cope with changes in the thickness of the square bar without shifting its center, and is highly accurate. It is an object of the present invention to provide a method for twisting a square bar and an apparatus therefor, which make it possible to obtain a twisted square bar with a good surface finish.

[Means for Solving the Problems] The problem described above is that in a method of twisting a square bar in which two parts of the square bar held are separated while being subjected to relative torsional motion, one of the square bars is The holding part is provided with vise claws for contacting 1 to 5 sides of the square bar, the same number as the number of sides of the square bar, and each of the vice claws connects one edge of the square bar abutting surface with the side surface of the square bar. A method for twisting a square bar, characterized in that the contact surface of the vise claw that extends beyond the side surface of the square bar is brought into sliding contact with the side surface of the nearest vise claw while one end edge is aligned, and the square bar is held. In a square bar torsion device in which two parts are separated while undergoing relative torsional motion, one of the square bar holding parts has an arm having a fulcrum in the middle, and an arm of the arm. A vise claw drive unit includes a vice claw for abutting the side surface of the square bar, which is attached to one end and rotates around the fulcrum, and a reciprocating press provided at the other end of the arm, In each of the vise claws, one edge of the square bar abutting surface and one edge of the side surface of the square bar are aligned, and the abutment surface of the vise claw that extends beyond the side surface of the square bar is the same as that of the nearest vise claw. This problem is solved by a square bar twisting device that is provided in sliding contact with the side surfaces and is provided in the same number as the number of sides of the square bar.

[Example] Hereinafter, the structure of the present invention will be explained in detail based on examples.

FIG. 1 is a schematic front view showing an embodiment of a square bar holding part according to the present invention, and FIG. 2 is a schematic enlarged view of the main part of FIG. 1.

The present invention relates to a means for twisting a square bar in which one part of the square bar is held by a chuck or the like, and the other part of the square bar is separated from the one holding part while undergoing a relative torsional movement. The section is provided with vise claws 5 of the same number as the number of sides of the square bar 9,
Further, in each vise claw 5, one edge 5b of the contact surface 5a with the square bar 9 and one edge 9b of the side surface 9a of the square bar are aligned, and the vise claw 5 crosses the side surface 9a of the square bar. The contact surface 5c is brought into sliding contact with the side surface 5d of the nearest vise claw 5, and by this method, the vise claw 5
is in contact with the entire circumferential surface of the side surface of the square bar 9, and presses and clamps the square bar 5 evenly and firmly.

When the thickness of the square bar 5 changes, rotate each vise claw 5 in the same direction around the center of the square bar 5 while satisfying the positional relationship between the vice claw 5 and the square bar 9 described above. This can be easily handled by moving (see the two-point A1 line in FIG. 2), and FIG. 1 shows an embodiment of a device that implements this method. That is, an arm 1 having a fixed fulcrum 2 in the middle, and an arm b
A vise claw 5 attached to one end of 1 with a tightening bolt 4, and a reciprocating 1 seat 1 provided at the other end of art.
The number of vise claw drive units 10 each having a freely movable pressing tool 6 is the same as the number of sides of the square bar 9, and each vice claw 5 is moved to each fulcrum 2 by pushing or returning each pressing tool 6.
Rotate around the center, and each vise claw! Drive unit 10
If they are the same, the center of the square bar 9 will not shift and the square bar 9
Even if the thickness of the corner J49 changes, the entire circumferential surface of the corner J49 is always kept in contact with it.

The pressing tool 6 is a linearly reciprocating cylinder or the like, and is provided on the arm 1 via the fulcrum 3. Reference numeral 7.8 denotes a stopper, which determines the upper and lower limits of movement of art % 1 that undergoes reciprocating motion, and the position of the stopper 7.8 is adjusted in advance according to the thickness of the square bar 9.

The embodiments shown in FIGS. 1 and 2 are cases in which the square bar 9 has a square cross section, and the embodiments in FIGS. 3 and 4 are cases in which the square bar 9 is triangular.

[Operations and Effects of the Invention] Therefore, according to the present invention, one part of the square bar can be held uniformly and firmly over its entire circumference and the square bar can be slidably contacted. When the twisting device is operated to produce a twisted square bar, the edges of the square bar are not damaged or cracks are generated.

A surface body with a constant twist pitch and less variation in accuracy - a bar with a good torsion angle is produced 1j). Furthermore, even if the surface of the square bar before twisting has some imperfections such as irregularities or cracks, the contact surface of the vise claw can rub against the surface of the square bar and smooth the surface. It can be used regardless of the quality.

In addition, even if the thickness of the square bar changes, it is easy to maintain the entire circumference of the square bar without shifting its center. Even if there is a problem, it is possible to manufacture it with high precision.

In addition, in the present invention, the mechanism for holding and rotating the vise claw is a simple structure made only by the reciprocating movement of the press Jt, and the number of fulcrums for rotating the vise claw is 11). Is there a slight amount of pressure, such as using a spring or the like to press one edge of the square bar abutting surface of the vise claw and one edge of the side surface of the square bar so that they do not rub? S1: No complicated means are required, it becomes easy to manufacture a torsion square rod with high precision without causing backlash or the like over a long period of time, there are fewer failures, and maintenance work can be easily performed.

[Brief explanation of drawings]

FIG. 1 is a schematic front view showing an embodiment of the square bar holder according to the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. A schematic front view showing another embodiment,
Figure 4 is an enlarged view of the main parts of Figure 3. FIG. 5 is a schematic side view of a conventional square bar twisting device, and FIG. 6 is a plan view taken along line A-A in FIG. 1... Arm 2... Fulcrum
3...Fully point 4...Tightening bolt 5
... Vise claw 6 ... Pressing tool 7
, 8... Stopper 9... Square bar
10... Vise claw drive unit

Claims (2)

[Claims] (1) In a method of twisting a square bar in which two parts holding a square bar are separated while undergoing relative torsional motion, one of the holding parts of the square bar has the same number of sides as the number of sides of the square bar. A vise claw is provided for abutting the side surface of the square bar, and each of the vice claws has one edge of the square bar abutting surface and one edge of the side surface of the square bar aligned with each other, and the side surface of the square bar of the vice claw is brought into contact with the side surface of the square bar. A method for twisting a square bar, characterized in that the abutment surface extending beyond the square bar is brought into sliding contact with the side surface of the nearest vise claw. (2) In a square bar torsion device in which two parts holding a square bar are separated while being torsionally interlocked relative to each other, one of the square bar holding parts has a fulcrum in the middle part. a vice claw for abutting the side surface of the square bar, which is attached to one end of the arm and rotates about the fulcrum;
A vise claw drive unit having a reciprocating pressing tool provided at the other end of the arm, each of which vice claws is connected to one edge of the square bar abutting surface and one of the side surfaces of the square bar. A corner characterized in that the contact surfaces of the vise claws extending beyond the side surfaces of the square bar are in sliding contact with the side surfaces of the nearest vise claw while the edges thereof are aligned, and the number of the contact surfaces is the same as the number of sides of the square bar. stick twisting device.