JPH028806B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] 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 square bars that are separated 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. It has a screw-like twist, and when manufacturing it, as shown in FIG. 5', for example, while rotating the chuck 11, the vise claw 5' is gradually moved away from the chuck 11, and the two holding parts are separated while being subjected to a relative torsional movement, thereby obtaining a twisted square bar. It was hot.

The vise claw 5' that holds a part of the square bar 9' is
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. It was a sliding thing.

[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. There are many problems such as the above defects and the tendency for burrs to form on the edge of the square bar 9' that is pressed, so we manufacture a torsion square bar with a constant twist pitch, little variation in accuracy, and a good surface finish. I had a problem.

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 for the same, which makes 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 abutting the side surfaces of the square bar, the number of which is the same as the number of sides of the square bar, and each of the vice claws is connected to one edge of the square bar abutting surface and one end of 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 the edges are aligned, and the square bar is held. In a torsion device for a square bar in which two parts are separated while being subjected to relative torsional motion, one of the holding parts of the square bar has an arm having a fulcrum in the middle, and an arm at one end of the arm. A vice claw drive unit comprising a vice claw for abutting the side surface of the square bar that is attached and rotates around the fulcrum, and a reciprocating pressing tool provided at the other end of the arm. In the vise claw, one end edge of the square bar abutting surface and one of the side surfaces of the square bar are aligned, and the abutting surface of the vise claw that extends beyond the side surface of the square bar is on the side surface of the nearest vise claw. This problem is solved by a twisting device for square rods, which is characterized in that the square rods are slidably connected and are provided in the same number as the number of sides of the square rod.

[Example] Hereinafter, the configuration of the present invention will be explained in detail based on an example.

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 held apart while being subjected to a torsional movement relative to the one holding part. The section is provided with vice claws 5 of the same number as the number of sides of the square bar 9, and each of the vice claws 5 has one end 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 contact surface 5c of the vise claw 5 that extends beyond the side surface 9a of the square bar is in sliding contact with the side surface 5d of the nearest vise claw 5. Yes, with this method,
The vise claws 5 are in contact with the entire circumferential surface of the side surface of the square bar 9, and press and hold the square bar 5 uniformly and firmly.

When the thickness of the square bar 5 changes, the above-mentioned vise claw 5 and square bar 9 should be moved around the center of the square bar 5.
This can be easily handled by moving each vise claw 5 so as to rotate in the same direction while satisfying the positional relationship (see the chain double-dashed line in Fig. 2). One embodiment is shown in FIG. That is, the fixed fulcrum 2
The arm 1 has an arm 1 in the middle, a vise claw 5 attached to one end of the arm 1 with a tightening bolt 4, and a reciprocating pressing tool 6 provided at the other end of the arm 1. The number of vise pawl drive units 10 consisting of If the unit 10 is the same, the center of the square bar 9 will not shift, and even if the thickness of the square bar 9 changes, the entire circumferential surface of the square bar 9 will always be held 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. Stoppers 7 and 8 determine the upper and lower limits of movement of the arm 1 that undergoes reciprocating motion, and the positions of the stoppers 7 and 8 are 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 shown 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 a torsion device is operated to produce a torsion square bar, it is possible to obtain a torsion square bar with a constant twist pitch, little variation in accuracy, and a good surface finish without damaging the edges of the square bar or generating burrs. It will be done. Furthermore, even if there are slight irregularities, burrs, or other defects on the surface of the square bar before twisting, the contact surface of the vise claw can smooth it by rubbing the surface of the square bar, and the square bar as a material is of low quality. It can be used even if there is a problem.

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, and it is easy to maintain the entire circumference of the square bar even if the thickness of the square bar changes. It also becomes possible to manufacture with high precision.

Further, in the present invention, the mechanism for holding and rotating the vise claw is a simple structure made only by reciprocating movement of the pressing tool, and the number of supporting points for obtaining the rotation is small, and the mechanism for holding and rotating the vise claw is simple. It does not require complicated means such as pressing 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 shift, and it can be used for a long time without wobbling etc. It becomes easy to manufacture the torsion square rod with high precision, and it becomes possible to reduce the number of failures and to easily perform maintenance work.

[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, FIG. 4 is an enlarged view of the main part of FIG. 3, FIG. 5 is a schematic side view of a conventional square bar twisting device, and FIG. 6 is a schematic view of A-A in FIG. FIG. 1... Arm, 2... Fulcrum, 3... Fulcrum, 4...
... Tightening bolt, 5 ... Vise claw, 6 ... Pressing tool, 7, 8 ... Stopper, 9 ... Square bar, 10 ...
...Vise claw drive unit.

Claims (1)

[Scope of 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, the holding part of one of the square bars has a part of the square bar attached to the holding part of the square bar. The same number of vice claws for abutting the side surfaces of the square bar as the number of sides are provided, 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. A method for twisting a square bar, characterized in that the abutment surface extending beyond the side surface of 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 undergoing relative torsional motion, one of the square bar holding parts has an arm having 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; and a reciprocating press provided at the other end of the arm. The vise claw drive unit is configured such that one end edge of the square bar abutting surface of each of the vice claws is aligned with one edge of the side surface of the square bar, and the abutment surface of the vise claw extends beyond the side surface of the square bar. A twisting device for a square bar, characterized in that the number of square bars is the same as the number of sides of the square bar and is in sliding contact with the side surface of the nearest vise claw.