KR101817619B1 - Tool holder - Google Patents

Abstract

The present invention relates to a tool holder which has a key groove having a unique structure such that machinability can be improved, a margin is produced with respect to tolerance, and accordingly costs can be reduced. The tool holder comprises: a rotation axis coupled to a spindle; a body provided with a coupling portion with the rotation axis at one side thereof, and provided with a body having a tool mounting portion at the other side thereof; and a key groove provided in the body, and provided in the spindle for supporting coupling with the spindle, wherein the key groove comprises: a securing portion provided in a recessed location on an outer surface of the body; an opening portion provided at one side of the securing portion; and a wall body portion provided in a location excluding the opening portion along a circumference of the securing portion.

Description

TOOL HOLDER {TOOL HOLDER}

The present invention relates to a tool holder which is a part of a machine tool such as a lathe, a drilling machine,

And more particularly, to a tool holder having a key groove having a unique structure and capable of providing improved workability, margin for tolerance, and cost reduction thereof.

In general, a machine tool is provided with a plurality of tools in a tool box, and a specific tool among the tools of the tool box is selected by a specific control command to perform a corresponding operation. At this time, Is called a tool holder.

Such a tool holder generally includes a rotating shaft that is coupled to the spindle and rotates, includes a body for providing a base, and includes engagement and retention means for supporting engagement with the spindle. And a holder key and a key groove for accommodating the holder key.

The prior art is based on the mounting groove 12, the bite 20, and the clamping bolt (not shown) 14 and a fastening bolt 36. The tool holder is fixed to the machine tool.

This structure has a problem of increasing the failure rate due to the complexity of the structure, and in particular, it does not have a margin for design tolerance, so that accurate numerical design and fabrication are required. As a result, Which leads to an increase in cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems,

It is an object of the present invention to provide a margin for tolerance through a key groove having a unique structure including a seat portion, an opening portion, and a wall portion, thereby providing improved workability and further reducing cost in the manufacturing stage.

It is also intended to alleviate the tolerance for tolerance as well as the positive insertion sensitivity of the holder key through a key groove having a unique structure having a U shape.

It is another object of the present invention to further enhance the effect of reducing the margin and sensitivity to the tolerance through a key groove having a unique structure including an inclined surface.

The present invention having the above object

A body provided with a tool mounting portion on one side and a coupling portion with the rotation axis on one side and a tool mounting portion on the other side, and a body mounted on the body, Wherein the key groove includes a seating portion provided at a position recessed from an outer surface of the body, an opening provided at one side of the seating portion, and a groove formed at a position excluding the opening portion along the periphery of the seating portion, And a wall portion provided on the wall.

Further, the seating portion of the keyway may be formed in a U-shape.

In addition, the wall portion of the key groove may include an inclined surface that widens the width of the seating portion toward the upper side.

The present invention having the above-

It has an effect of providing a margin for tolerance, thereby providing an improved processability and, furthermore, reducing cost in the manufacturing stage and alleviating the sensitivity of correct insertion of the holder key, thereby reducing manufacturing cost and improving manufacturing.

1 is a perspective view of the present invention.
2 is a side view of the present invention.
3 is a rear view of the present invention.
4 is a detailed view of the present invention.

While the present invention has been described in connection with certain embodiments, it is obvious that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the term " comprising " or " consisting of ", or the like, refers to the presence of a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

It is to be understood that the first to second aspects described in the present specification are merely referred to in order to distinguish between different components and are not limited to the order in which they are manufactured, It may not match.

The present invention relates to a tool holder having a key groove having a unique structure and capable of providing improved workability, margin for tolerance, and cost reduction.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a tool holder (hereinafter referred to as " apparatus H ") according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of the present invention, FIG. 2 is a side view, and FIG. 3 is a rear view.

As shown in Figs. 1 to 3, the apparatus H mainly includes a pivot shaft 1, a body 2, and a key groove 3.

For each configuration, the rotary shaft 1 is coupled to the spindle at the center of rotation so that the device H can be rotated by receiving a rotational force from the spindle. Here, the spindle is a part of a machine tool such as a lathe, a drilling machine, or the like, and is a rotary shaft used for mounting a tool holder such as the present invention.

Next, as shown in Figs. 1 to 3, the body 2 is provided with the base of the apparatus H and has a coupling portion 21 with the rotary shaft 1 on one side, And the tool mounting portion 22 is provided on the other side. Here, with reference to Fig. 1, one side is the upper side and the other side is the lower side. The coupling portion 21 is coupled to the rotary shaft 1. The coupling between the rotary shaft 1 and the body 2 is preferably integrally coupled through a welding connection. The tool mounting portion 22 is provided with a drill, a cutter, A tool suitable for the operation such as a cutting tool is selected and combined.

Next, the key groove 3 is configured to receive the holder key provided on the spindle for supporting the coupling between the apparatus H and the spindle. As shown in Figs. 1 to 3, And more specifically, it is provided on any part of the outer surface of the body 2. [

Particularly, the key groove 3 is a key feature of the present invention. As shown in FIGS. 1 to 3, the key groove 3 includes a seating portion 31 provided at a position recessed from the outer surface of the body 2, An opening 32 provided at one side and a wall portion 33 provided at a position excluding the opening 32 along the periphery of the seating portion 31.

The opening portion 32 is a space opened to one side of the seating portion 31 and the wall portion 33 is a space in which the key groove 3 is seated, This is a part that can be fixed.

The present invention having the above-described features and features can provide tolerance for a clearance by presenting a key groove (3) having one side opened through an opening (32), thereby providing improved workability and, furthermore, Cost reduction effect.

BRIEF DESCRIPTION OF THE DRAWINGS The features and additional features of the present invention will be described with reference to the accompanying drawings.

1 and 2, the body 2 includes a first body 2A on one side and a second body 2A on the side of the first body 2A. And the other second body 2B. In particular, the first body 2A and the second body 2B are arranged on the upper side and the lower side, respectively.

The engaging portion 21 may be provided on the first body 2A and the tool mounting portion 22 may be provided on the second body 2B. More preferably, 1, the tool mounting portion 22 may be provided at the other end (lower end) of the second body 2B at one end (upper end) of the body 2A.

Also, it is preferable that the first body 2A and the second body 2B are integrally coupled to each other.

In the present invention, the engaging portion 21 to which the rotational force is applied and the tool mounting portion 22 to which the tool is mounted are physically separated from each other by the separation structure of the body 2, It is possible to minimize the problem that the tool is released by the tool.

1 to 3, the apparatus H includes a seat portion 31 of a key groove 3, a seat portion 3, And can be formed in a U-shape.

In this embodiment, the 'U' shape originates from the shape of the opening 32 and the wall portion 33. In one embodiment, in the U shape, the curved portion of the wall portion 33 is formed on the rotation axis 1) direction, the opening 32 can be arranged in the direction of the tool mounting portion 22.

With this configuration, the present invention can have a margin for tolerance and a positive sensitivity of the holder key, the curved portion of the wall portion 33 providing a margin for tolerance, The holder key itself is moved along the curved portion of the wall portion 33 so as to be accommodated while correcting the correct position, thereby providing improved manufacturing and use convenience .

Next, another detailed feature of the key groove 3 is that the wall portion 33 of the key groove 3 is inclined with respect to the inclined surface 330 so that the width of the seating portion 31 widens toward the upper side And the like.

4 and the detailed view of the present invention, the wall portion 33 includes an inclined surface 330 on the inner side, and the inclined surface 330 is formed in such a manner that the width of the seating portion 31 is at the upper side As shown in FIG.

The inclination of the inclined surface 330 works together with the above features to further enhance the effect of ensuring clearance for the tolerance and relieving the positive sensitivity of the holder key.

Particularly, the angle (a) formed by the inclination angle a of the inclined plane 330, that is, the extension line of the vertical line of the wall portion 33 and the inclined plane 330 is preferably 5 to 15 degrees, more preferably 10 degrees.

The clearance between the holder key and the wall portion 33 is significantly increased so that the holder key is not moved to the seating portion 31. In this case, So that the effect of supporting the coupling force is deteriorated.

Next, in further detail of another key groove 3, the apparatus H includes a first round 331 having a wall portion 33 of the key groove 3 at its inner end, 2 < / RTI >

4, the first round 331 is provided at the inner end of the wall portion 33, that is, at the lower end of the wall portion 33 (the seating surface side of the seating portion 31) And the second round 332 is provided at the outer end of the wall portion 33, that is, at the upper end of the wall portion 33 (the outer surface side of the body 2).

The first round 331 and the second round 332 also provide an effect of reducing the sensitivity of the holder key to the correct insertion of the holder key. And the second round 332 provided on the outer side corrects the correct position of the holder key that enters the seating part 31. In this case,

The apparatus H may further include a machining groove 4 provided on the outer surface of the body 1 and provided around the other circumference not provided with the key groove 3.

The machining groove 4 has an effect of holding the body 1 more firmly and preventing the body 1 from swinging.

The present invention is further characterized in that it can further include a corrosion preventing layer provided on the outer surface of the pivot shaft (1) and the body (2).

This corrosion inhibiting layer is added in order to further improve the waterproofing property of the present soundproofing wall. The corrosion inhibiting layer is composed of 2 to 3 wt% of Pozzolan, 3 to 4 wt% of wax or paraffin, 1 to 4 wt% of styrene thermoplastic elastomer, 2 to 3 wt% of amorphous polyolefin (APO), and 0.5 to 0.7 wt% of iron slag, and the balance of the balance is a mixture of silica filler and pozzolan powder (The weight% is based on the total weight of the corrosion inhibiting layer)

First, the mixed material is made by mixing the silica filler and the pozzolan powder, and it occupies 80 to 90% by weight of the total composition ratio of the corrosion inhibiting layer together with water, and increases the specific gravity of water according to the production design such as coagulation, It is possible to carry out an operation of lowering.

In particular, the silica filler is added to improve the physical properties such as tensile strength and hardness, and the silica filler can use fumed silica having a relatively low incidence of yellowing phenomenon, and one of hydrophobic dry silica and hydrophilic dry silica Or more can be used.

Pozzolan is a natural mineral material such as diatomite and provides purification of foreign matter adhering to the outer surface of the corrosion inhibiting layer by anion release, deodorization and antibacterial action. And prevents the occurrence of cracks in the corrosion prevention layer. When the pozzolan is less than 2% by weight, the cleaning effect is low, and when it is more than 3% by weight, the binding force is decreased.

Next, the corrosion inhibiting layer may contain 3 to 4% by weight of wax or paraffin. Since wax or paraffin has a melting point of 40 to 60 캜, it acts to lower the production temperature of the corrosion inhibiting layer, It is not volatilized and the quality is not deteriorated. When the wax or paraffin is added in an amount of less than 3% by weight, the effect of addition is scarcely produced. When the amount of the wax or paraffin is more than 4% by weight, the brittleness of the anticorrosion layer increases and cracks easily occur.

Next, the anti-corrosion layer may contain 1 to 2% by weight of a styrene thermoplastic elastomer. The styrene thermoplastic elastomer has a polystyrene block as a hard segment in the short-term end and a soft segment as the polybutadiene in the middle soft segment. It can be low viscosity when dissolved in mixed solvents. It has excellent elasticity and low temperature durability, and cracks of corrosion preventing layer caused by elapsing time and lifting of surface of corrosion preventing layer caused by lack of low temperature durability during winter season The synthetic zeolite powder dispersed in the particulate state exhibits a function of preventing development, and has an advantage that the corrosion inhibiting layer can have a certain buffer against the external force due to the regular fine pores therein.

The anticorrosive layer may contain 2.5 to 3.5% by weight of the amine-based curing agent. If the content of the amine-based curing agent is less than 2.5% by weight, the strength and durability may be lowered, The viscosity becomes high and the workability becomes poor.

Next, the anti-corrosion layer may further include 1.5 to 3% by weight of an amorphous polyolefin. Amorphous polyolefin (APO) is a strong adhesive material in which olefins such as ethylene and propylene are added and polymerized. Thereby minimizing the change in temperature acting on the corrosion inhibiting layer.

Hereinafter, an embodiment of the corrosion prevention layer will be described.

Example

750 g of a mixed material was prepared by mixing 500 g of a silica filler and 250 g of a pozzolan powder as a corrosion inhibiting layer, and 140 g of water was mixed with 20 g of pozzolan, 30 g of paraffin, 10 g of a styrene plastic elastomer, 30 g of an amine curing agent and 20 g of an amorphous polyolefin To prepare 1 kg of a corrosion inhibiting layer.

Thereafter, the anti-corrosive layer was applied to the outer surface of the body 2 of the apparatus H (tool holder) and then completely cured to form a corrosion preventive layer. After spraying water for 12 hours in the tool holder, As a result of examining the degree of internal infiltration after removing the corrosion inhibiting layer, no moisture was detected on the outer surface of the body 2.

While the invention has been shown and described with reference to certain embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

H: This device (tool holder)
1:
2: Body
21: engaging portion 22: tool mounting portion
3: Keyway
31: seat part 32: opening
33: wall part 330: inclined surface

Claims (4)

A pivot shaft coupled to the spindle;
A body having a coupling portion with the pivot shaft on one side and a tool mounting portion on the other side; And
A key groove in said body for receiving a holder key provided on said spindle for supporting engagement with said spindle;
≪ / RTI >
Wherein the key groove includes a seating part provided at a position recessed from an outer surface of the body, an opening part provided at one side of the seating part, and a wall part provided at a position excluding the opening part along the periphery of the seating part,
And a corrosion preventing layer provided on the outer surface of the rotating shaft and the body,
The corrosion-
Wherein the anticorrosive layer contains 2 to 3 wt% of pozzolan, 3 to 4 wt% of wax or paraffin, 1 to 2 wt% of styrene thermoplastic elastomer, 2.5 to 3.5 wt% of amine curing agent, : 1.5 to 3% by weight of an amorphous polyolefin, and 0.5 to 0.7% by weight of an iron slag.
The method according to claim 1,
Wherein a seating portion of said keyway is formed in a U-shape.
The method according to claim 1,
Wherein the wall portion of the key groove includes an inclined surface that widens the width of the seating portion toward the upper side.
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