JP3184153U - Water retaining nut for cutting tools - Google Patents

Abstract

A water stop nut for use in a cutting tool and for preventing water leakage is provided.
A nut 10 having a stepped hole 11 formed at the center of the front end, and a cutting tool insertion hole 21 formed at the center, and attached to the stepped hole 11, an inner peripheral surface of the cutting tool insertion hole 21. An inner fitting groove is formed at the center of the inner fitting groove, a straight inner circumferential surface is provided on the front side of the inner fitting groove, and a concave inner circumferential surface is provided on the rear side of the inner fitting groove. An injection port is formed between a virtual surface extending from the concave inner peripheral surface and a virtual surface extending from the straight inner peripheral surface, and the depth of the injection port is the depth of the inner fitting groove. The water retaining ring 20 shallower than half and installed in the inner fitting groove, the outer peripheral surface is in contact with the inner peripheral surface of the inner fitting groove, and the inner peripheral portion protrudes inside beyond the inner fitting groove, This is a cutting nut for a cutting tool having a sealing ring 30 having a circular cross section.
[Selection] Figure 1

Description

  The present invention particularly relates to a water stop nut for use in a cutting tool to prevent water leakage.

  An existing water retaining nut for a cutting tool has a stepped hole to which the water retaining ring is attached at the front end of the nut, and a sealing ring is installed between the stepped hole and the water retaining ring. A cutting tool insertion hole is formed in the center of the water retaining ring, a sealing groove is formed in the inner peripheral wall of the cutting tool insertion hole, and a sealing ring is further installed in the sealing groove.

  When using an existing water retaining nut for a cutting tool, the water retaining nut is screwed to the front end of the cutting tool and the tube on which the cutter is installed is held. At this time, since the cutter is mounted so as to go forward through the cutting tool insertion hole of the water retaining ring, the sealing ring is brought into contact with the outer peripheral surface of the cutter to provide a water retaining effect. it can.

  However, the existing water retaining nut for a cutting tool can provide a water blocking effect when the cutter comes into contact with the sealing ring, but the sealing ring cannot tighten the cutter. Therefore, when the coolant is injected into the cutting tool with a large pressure, the coolant may leak from the gap between the cutter and the sealing ring. In particular, when used for a long period of time, the sealing effect gradually decreases as the elasticity of the sealing ring decreases.

The water stop nut for a cutting tool according to the present invention is
A nut with a stepped hole formed in the center of the front end;
A cutting tool insertion hole is formed at the center of the stepped hole, an inner fitting groove is formed at the center of the inner peripheral surface of the cutting tool insertion hole, and the inner peripheral surface of the cutting tool insertion hole. A straight inner peripheral surface is provided on the front side of the inner fitting groove in the inner surface, and a concave inner peripheral surface is provided on the rear side of the inner fitting groove on the inner peripheral surface of the cutting tool insertion hole. The distance from the inner peripheral surface of the mating groove to the straight inner peripheral surface is the depth L of the inner fitting groove, and the width W in the front-rear direction of the inner fitting groove is greater than the depth L of the inner fitting groove. The concave inner peripheral surface has an inner diameter larger than the inner diameter of the straight inner peripheral surface, and a virtual surface extending from the concave inner peripheral surface and a virtual surface extending from the straight inner peripheral surface A water-stop ring in which an inlet is formed in between, and the depth of the inlet is shallower than half the depth L of the inner fitting groove;
It is installed in the inner fitting groove, the diameter R is in the range from the depth L of the inner fitting groove to the width W in the front-rear direction of the inner fitting groove, and the outer peripheral surface is the inner circumference of the inner fitting groove A sealing ring having a circular cross section is provided, with the inner peripheral portion projecting inwardly beyond the inner fitting groove while being in contact with the surface.

Further, in the water retaining nut for a cutting tool, the concave inner peripheral surface is a tapered inclined surface having a rear end inner diameter smaller than the front end inner diameter, and an inner diameter decreasing from the front end toward the rear end,
Moreover, the front end opening in the injection port may be larger than the rear end opening.

Moreover, in such a water retaining nut for a cutting tool, the concave inner peripheral surface is a straight flat surface,
The front end opening of the injection port may have the same depth as the rear end opening.

  According to the above-described structure, when using the water retaining nut for a cutting tool according to the present invention, the nut is first screwed onto the cutter shaft. At this time, since the diameter of the cutter of the cutting tool is the same as the diameter of the cutting tool insertion hole and the inner diameter of the straight inner peripheral surface, the cutter passes through the cutting tool insertion hole toward the front end. Since it is attached, the inner peripheral surface of the sealing ring can be brought into tight contact with the outer peripheral surface of the cutter.

Further, when the cooling liquid is injected from the rear end of the cutter shaft, the cooling liquid flows from the nut through the injection port into the clearance on the rear side of the sealing ring in the inner fitting groove 1. The coolant flowing from the inlet has a structure in which the depth of the inlet is shallower than half of the depth of the inner fitting groove. Deform the ring. In addition, the outer peripheral surface of the sealing ring is brought into contact with the inner peripheral surface of the inner fitting groove, and a reaction force is generated at the contacted portion due to the deformation of the sealing ring. The ring can tighten the cutter via the inner peripheral surface.

  Therefore, the greater the pressure for injecting the coolant, the greater the reaction force for sealing, and the better the sealing effect of the water retaining nut, so that leakage of coolant from the surroundings of the cutter can be prevented. I can do it.

It is sectional drawing of the 1st Example of the water stop nut for cutting tools which concerns on this invention. It is a partial expanded sectional view of the 1st Example of the water stop nut for cutting tools concerning this invention. It is explanatory drawing which shows the state which combined the cutting tool in the 1st Example of the water stop nut for cutting tools which concerns on this invention. It is explanatory drawing of the elements on larger scale which show the state which combined the cutting tool in the water stopper nut for cutting tools which concerns on this invention 1st Example. It is explanatory drawing of the elements on larger scale which show the state which combined the cutting tool in the water stopper nut for cutting tools which concerns on this invention 1st Example. It is explanatory drawing of the elements on larger scale which show the state which combined the cutting tool in the water stopper nut for cutting tools which concerns on this invention 1st Example.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the following Example is only what showed the preferred embodiment of this invention, and the technical scope of this invention is not limited to the following Example itself at all.

  As shown in FIGS. 1 and 2, the first embodiment of the water retaining nut for a cutting tool according to the present invention includes a nut 10, a water retaining ring 20, and a sealing ring 30.

  Among them, the nut 10 has a stepped hole 11 formed in the center of the front end. The stepped hole 11 includes a small-diameter front step portion and a large-diameter rear step portion, and an outer fitting groove 12 is formed in the rear step portion. The outer periphery sealing ring 13 is installed in the outer fitting groove 12.

  The water retaining ring 20 has an annular shape, is attached to the stepped hole 11, a cutting tool insertion hole 21 is formed at the center, and is fitted into the center of the inner peripheral surface of the cutting tool insertion hole 21. A groove 211 is formed, a straight inner peripheral surface 212 is provided on the front side of the inner fitting groove 211 on the inner peripheral surface of the cutting tool insertion hole 21, and an inner surface on the inner peripheral surface of the cutting tool insertion hole 21 is formed. A concave inner peripheral surface 213 is provided on the rear side of the fitting groove 211.

  The distance from the inner peripheral surface of the fitting groove 211 to the straight inner peripheral surface 212 is the same as the depth L of the inner fitting groove 211, while the inner fitting groove 211 has a width in the front-rear direction. W is larger than the depth L of the inner fitting groove 211.

  The inner diameter of the concave inner peripheral surface 213 is larger than the inner diameter of the straight inner peripheral surface 212, the inner diameter of the rear end of the concave inner peripheral surface 213 is smaller than the inner diameter of the front end, and the inner diameter decreases from the front end toward the rear end. A tapered inclined surface is provided.

  Further, an inlet 22 having a front end opening larger than a rear end opening is formed between a virtual surface extending from the concave inner peripheral surface 213 and a virtual surface extending from the straight inner peripheral surface 212 (see FIG. 2), the depth of the front end and the depth of the rear end of the injection port 22 are each shallower than half the depth L of the inner fitting groove 211.

  The sealing ring 30 is installed in the inner fitting groove 211 and has a circular cross section. The diameter R of the sealing ring 30 is a width W in the front-rear direction of the inner fitting groove 211 from the depth L of the inner fitting groove 211. In addition, the outer peripheral surface of the sealing ring 30 is in contact with the inner peripheral surface of the inner fitting groove 211, and the inner peripheral portion projects beyond the inner fitting groove 211.

  The water retaining nut for a cutting tool according to the present invention may have a concave inclined inner peripheral surface 213 as in the first embodiment, and a concave inner peripheral surface 213 as in the following second embodiment. A straight plane may be used. As shown in FIG. 6, in the second embodiment of the present invention, the inner diameter of the concave inner peripheral surface 213A is larger than the inner diameter of the straight inner peripheral surface 212, and the virtual surface extending from the concave inner peripheral surface 213A is straight. Parallel to a virtual surface extending from the inner peripheral surface 212. That is, an inlet 22A is formed in which the front end opening of the concave inner peripheral surface 213A has the same depth as the rear end opening.

  When the water retaining nut for a cutting tool according to the first embodiment of the present invention is used, the nut 10 is screwed to the tip of the cutter shaft 40, and the nut 50 is combined with the cutter shaft 40 to hold the tube 50. The cutter 60 is inserted into the tube 50. Since the diameter of the cutter 60 is the same as the diameter of the cutting tool insertion hole 21 and the inner diameter of the straight inner peripheral surface 212, when the cutter 60 is attached to the front end through the cutting tool insertion hole 21. The inner peripheral surface of the sealing ring 30 contacts the outer peripheral surface of the cutter 60.

  As shown in FIGS. 3 to 5, when the coolant is injected from the rear end of the cutter shaft 40, the coolant flows into the nut 10 and contacts the water stop ring 20. At this time, the coolant flows into the gap on the rear side of the sealing ring 30 in the inner fitting groove 211 through the inlet 22 between the concave inner peripheral surface 213 and the outer peripheral surface of the cutter 60.

  Further, since the depth of the injection port 22 is shallower than half of the depth of the inner fitting groove 211, the coolant hits the vicinity of the inner periphery of the rear surface of the sealing ring 30 and deforms the sealing ring 30. By doing so, the outer peripheral surface of the sealing ring 30 is brought into contact with the inner peripheral surface of the inner fitting groove 211, so that the inner peripheral surface of the sealing ring 30 can be firmly brought into contact with the cutter 60.

  According to the above configuration, the greater the pressure for injecting the coolant, the greater the sealing force and the greater the sealing effect. Therefore, it is possible to prevent the coolant from leaking around the cutter 60. I can do it.

DESCRIPTION OF SYMBOLS 10 Nut 11 Stepped hole 12 Outer fitting groove 13 Outer periphery sealing ring 20 Water retaining ring 21 Cutting tool insertion hole 211 Inner fitting groove 212 Straight inner peripheral surface 213, 213A Concave inner peripheral surface 22, 22A Inlet 30 Sealing ring 40 Cutter shaft 50 Tube 60 Cutter R Diameter of sealing ring L Depth of inner fitting groove W Width of inner fitting groove in the front-rear direction

Claims (3)

A nut with a stepped hole formed in the center of the front end;
A cutting tool insertion hole is formed at the center of the stepped hole, an inner fitting groove is formed at the center of the inner peripheral surface of the cutting tool insertion hole, and the inner peripheral surface of the cutting tool insertion hole. A straight inner peripheral surface is provided on the front side of the inner fitting groove in the inner surface, and a concave inner peripheral surface is provided on the rear side of the inner fitting groove on the inner peripheral surface of the cutting tool insertion hole. The distance from the inner peripheral surface of the mating groove to the straight inner peripheral surface is the depth L of the inner fitting groove, and the width W in the front-rear direction of the inner fitting groove is greater than the depth L of the inner fitting groove. The concave inner peripheral surface has an inner diameter larger than the inner diameter of the straight inner peripheral surface, and a virtual surface extending from the concave inner peripheral surface and a virtual surface extending from the straight inner peripheral surface A water-stop ring in which an inlet is formed in between, and the depth of the inlet is shallower than half the depth L of the inner fitting groove;
It is installed in the inner fitting groove, the diameter R is in the range from the depth L of the inner fitting groove to the width W in the front-rear direction of the inner fitting groove, and the outer peripheral surface is the inner circumference of the inner fitting groove A water retaining nut for a cutting tool, comprising: a sealing ring that is in contact with a surface, has an inner peripheral portion protruding beyond the inner fitting groove, and having a circular cross section. The concave inner peripheral surface is a tapered inclined surface having a rear end inner diameter smaller than the front end inner diameter and an inner diameter decreasing from the front end toward the rear end,
The water stop nut for a cutting tool according to claim 1, wherein a front end opening at the inlet is larger than a rear end opening. The concave inner peripheral surface is a straight plane,
The water stop nut for a cutting tool according to claim 1, wherein the front end opening of the injection port has the same depth as the rear end opening.

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