KR20150127407A - Work head of tool grinding machine having a back-lash reducing device - Google Patents

Abstract

The present invention relates to a work head for a tool grinding machine, on which a tool required to be ground is installed to rotate. The work head comprises: a worm wheel and a worm, meshed and interlocked with each other, on one side inside the work head; a housing receiving the worm inside; and a backlash reducing means elastically supporting the housing in an upper direction to restrict the separation of the worm wheel and the worm.

Description

Technical Field [0001] The present invention relates to a work head for a tool grinding machine having a backlash abatement means,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a work head for a tool grinder having a backlash abatement means, and is provided with a backlash abatement means for providing an elastic restoring force to one side of a worm, thereby restricting the gap between the worm and the worm wheel, To a workpiece grinder for a tool grinder.

Back-lash refers to a clearance between tooth surfaces when a pair of gears is meshed. If too much backlash is present, the lubricant becomes insufficient and the friction between teeth becomes large. On the other hand, if backlash is too large, The gear is easily damaged.

Accordingly, in the related art, there is disclosed a technique for raising the helical gear by using a hydraulic drive apparatus and forcing the pinion gear upward in the axial direction due to the rise of the helical gear, thereby reducing backlash.

However, since the helical gear is not easy to process due to the gear connection structure, the axial force is transmitted to shorten the life of parts such as bearings, and the structure of the helical gear is complicated due to a relatively large number of components such as a hydraulic drive unit, There is a high problem.

Accordingly, Korean Patent Publication No. 10-2012-0068195 discloses a double pinion gear structure for removing backlash using an eccentric key.

However, since double pinion requires high processing technology, it is almost uneconomical to rely on imports.

Accordingly, Korean Patent Laid-Open Publication No. 10-2012-0063306 discloses an input stage worm gear assembly composed of a combination of a plurality of worm gears and an output stage helical gear assembly composed of a combination of a plurality of helical gears, A structure is disclosed.

However, in the related art, there is also a problem that the number of components required to reduce backlash is large, which makes maintenance and repair difficult, and it is difficult to apply to a workpiece of a tool grinder for grinding a tool having precise dimensions.

That is, when grinding is carried out with a tool mounted on a work head where backlash occurs, it causes defects as shown in Figs. 1 and 2. Such a poorly machined tool has a high possibility of breakage and a problem that a required power is increased due to a decrease in machining performance .

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the problems of the prior art as described above and to provide a backlash reducing means for providing an elastic restoring force to one side of a worm to limit backlash between the worm and the worm wheel, And a tool for grinding a tool.

It is another object of the present invention to provide a worm gear which is capable of compensating for the elastic restoring force provided by the backlash reducing means even if the gear portion of the worm wheel having a relatively low wear resistance is worn out due to wear of the worm wheel, And to provide a work head for a tool grinder equipped with a backlash reducing means for facilitating maintenance and management.

The present invention relates to a workpiece grinder for a tool grinder in which a tool requiring grinding is mounted and rotated. The workpiece grinder includes a worm wheel and a worm engaged with each other at one side of the work head, a housing accommodating the worm therein, And a backlash reducing means for elastically supporting the worm wheel in the upward direction to limit the gap between the worm wheel and the worm.

The backlash reducing means includes a bracket fixed to the inside of the body forming the outer surface of the work head, an elastic member having an elastic restoring force and in contact with one side of the outer surface of the housing, and an elastic member coupled to one side of the bracket, And a pressing member for providing a pressing force.

And a pressing surface for extending an area of contact with the elastic member is provided at one side of the housing.

And the elastic member is positioned between the pressing member and the housing.

And the backlash reducing means presses the outer circumferential surface of the portion where the worm gear is not formed.

The work head is provided with a plurality of bearings for guiding the rotation of the worm, and the backlash reducing means provides pressure in a direction orthogonal to the rotation center of the multiple bearings.

And a release member is provided at one side of the pressing member so as not to release the force of the pressing member against the bracket.

In the present invention, a backlash reducing means for providing an elastic restoring force to one side of the worm is provided to limit the separation between the worm and the worm wheel.

Therefore, it is unnecessary to replace or fine-adjust components for eliminating backlash, so that the usability is improved, and maintenance and management are advantageous.

Further, in the present invention, even if the gear portion of the worm wheel, which has relatively less wear resistance, is worn due to wear of the worm wheel, which is relatively worn as compared with the worm, is generated automatically due to the elastic restoring force provided by the backlash reducing means, There is an advantage that the usability is improved.

1 is a front view comparing the state of a tool according to whether a backlash is generated or not.
Fig. 2 is a bottom view comparing the machining state of the tool according to whether or not backlash has occurred. Fig.
3 is a perspective view showing a schematic configuration of a tool grinder in which a preferred embodiment of the present invention is employed;
4 is an internal structural view showing a work head internal structure of a tool grinder in which a preferred embodiment of the present invention is employed;
FIG. 5 is a reference view showing a worm wheel and a worm provided in a work head of a tool grinder employing a preferred embodiment of the present invention. FIG.
Figure 6 is a rear perspective view of Figure 3 showing the interior of the workhead of a tool grinder employing the preferred embodiment of the present invention;
Figure 7 is a front perspective view of Figure 3 showing the interior of the workhead of a tool grinder employing a preferred embodiment of the present invention;

The configuration of the tool grinder will be described below with reference to Fig. 3 attached hereto. FIG. 3 is a perspective view showing a schematic configuration of a tool grinder employing a preferred embodiment of the present invention.

Prior to this, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may appropriately define the concept of the term in order to describe its invention in the best possible way It should be construed as meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely preferred embodiments of the present invention, and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

The tool grinder G mainly includes a work head 100 on which a tool to be grinded is installed and rotated and a grinding member (not shown) for grinding the tool, which is located on the upper side of the work head 100, And a cooling means 300 for lowering the heat generated when the grinding member comes into contact with the tool and grinding.

The grinding means 200 is configured to linearly reciprocate up and down so that the grinding member can be brought close to the work head 100 and the cooling means 300 can adjust the position where the cooling fluid is injected And is configured to be flexible.

The work head 100 is provided with a grip portion 110 for grasping a tool on the left side, and the grip portion 110 is rotatable while holding a tool.

Therefore, the spindle 120 for guiding the rotation of the gripper 110 is provided on the right side of the gripper 110.

The work head 100 is formed with an outer appearance by a body 130, and the body 130 is configured to be two-dimensionally movable.

Therefore, the work head 100 and the grinding means can respectively move and polish the tool three-dimensionally.

The body 130 is provided with a backlash reducing means 150, which is a main component of the present invention.

The backlash reducing means 150 will be described in detail below with a structure for reducing backlash by restricting the separation between the worm wheel 160 and the worm 170 which mesh with the work head 100.

The details of the backlash reducing means 150 will be described below with reference to FIGS.

FIG. 4 is an internal structural view showing the internal structure of a work head 100 of a tool grinder in which a preferred embodiment of the present invention is employed, and FIG. 5 is a cross sectional view of a tool grinder in which a preferred embodiment of the present invention is employed. FIG. 6 and FIG. 7 are views showing a state in which the worm wheel 160 and the worm 170 are engaged with each other, and FIG. 6 and FIG. 7 are a rear view and a front view, respectively, of FIG. 3 showing the inside of the work head 100 of the tool grinder, It is a perspective view.

As shown in the drawing, a predetermined space is formed in the body 130, and a worm wheel 160 is rotatably positioned above the space of the body 130.

A worm 170 is provided under the worm wheel 160 and the worm wheel 160 is engaged with the worm gear 172 and is rotatable. 4, the worm 170 and the worm wheel 160 are engaged with the worm gear 172 and the worm wheel 162. When the worm 170 rotates, And is rotatable about a rotation center orthogonal to the rotation center.

A power generator 180 is provided below the worm 170. The power generator 180 is configured to generate rotational power by receiving power, and substantially provides rotation power for rotating the worm 170.

On the right side of the power generator 180, a first timing pulley 182 is provided. The first timing pulley 182 is configured to be axially coupled to the shaft 181 of the power generator 180 to transmit a rotational force to the worm 170. A second timing pulley And a belt 184 meshes with an outer surface of the first timing pulley 182 and the second timing pulley 186.

Accordingly, when the power generator 180 generates rotational power and the shaft rotates, the first timing pulley 182 rotates in conjunction with the shaft, and the first timing pulley 182 rotates, The second timing pulley 184 and the second timing pulley 186 rotate to rotate the worm 170.

A cover 192 is provided on the right side of the body 130. When the cover 192 is separated from the body 130, the cover is opened as shown in FIG. 6.

On the inner side of the body 130, there is provided a backlash reducing means 150, which is a main component of the present invention. The backlash reducing means 150 is located below the housing 188 that houses the worm 170 and is elastically supported in the upward direction to limit the gap between the worm wheel 160 and the worm 170. [

The detailed structure of the backlash reducing means 150 will be described with reference to FIGS. 4 and 7 attached hereto.

The backlash reducing means 150 includes a bracket 152 fixed to the inside of the body 130, an elastic member 154 having an elastic restoring force and contacting one side of the outer surface of the housing, And a pressing member 156 for applying pressure to the elastic member 154. [

" 형상을 갖도록 성형되어 우측면이 몸체(130)에 접촉한 상태로 고정되며, 하면에는 상방향으로 가압부재(156)가 삽입된다.4, the bracket 152 has a substantially "

The right side surface is fixed in contact with the body 130, and the pressing member 156 is inserted upward in the lower surface.

The pressing member 156 is configured to be adjustable in insertion depth with respect to the bracket 152 and the elastic member 154 is positioned between the pressing member 156 and the bracket 152.

Therefore, when the upper end portion of the pressing member 156 is moved upward, the elastic member 154 generates an elastic restoring force in the upward direction, and the elastic restoring force is provided on the outer surface of the housing to elastically support the lever in the upward direction. .

The elastic member 154 can be changed into various shapes and materials as long as it can generate an elastic restoring force when pressure is applied, but a leaf spring is adopted in the present invention example.

A washer 153 is provided between the elastic member 154 and the pressing member 156. The washer 153 is configured so that the elastic restoring force of the elastic member 154 can be effectively transmitted to the housing.

A pressing surface 189 is formed on the outer surface of the housing, more specifically, on the left outer surface of the housing.

The pressing surface is configured to have a flat surface rather than a curved surface by cutting off a part of the outer surface of the housing, so that the elastic restoring force of the elastic member 154 can be effectively transmitted to the housing.

A cap 190 is provided on the left side of the housing to shield the inside of the opened housing.

Meanwhile, the elastic member 154 is pressed from the pressing member 156 while being accommodated in the seating member 159 to generate an elastic restoring force.

The lower part of the seating member 159 is screwed to the pressing member 156 and the inside thereof is opened upward to accommodate the elastic member 154.

Accordingly, the elastic member 154, which has received the pressure from the pressing member 156, can move upward and can generate an elastic restoring force in a state in which the elastic member 154 is prevented from being separated from the outer surface of the housing.

A release member 158 is further provided between the pressing member 156 and the bracket 152. The release member 158 has a structure in which the pressing member 156 and the bracket 152 are in contact with the outer surface at the same time so that the pressing member 156 is not rotated relative to the bracket 152, So that the pressing member 156 can be rotated.

The worm (170) is rotatable with a plurality of bearings (B) arranged in the longitudinal direction. The backlash reducing means 150 is configured to provide an elastic restoring force in a direction orthogonal to the rotation center of the bearing B.

This is considered to prevent the bearing B from being damaged by the elastic restoring force provided by the backlash abatement means 150.

The scope of the present invention is not limited to the above-described embodiments, and many other modifications based on the present invention will be possible to those skilled in the art within the scope of the present invention.

100. Workhead 110. Grasp
120. Spindle 130. Body
150. Backlash reduction means 152. Bracket
153. Washer 154. Elastic member
156. Pressure member 158. Release zone
159. Seat member 160. Worm wheel
162. Worm wheel gear 170. Worm
172. Worm gear 180. Power generator
181. Axis 182. First Timing Pulley
184. Belt 186. Second Timing Pulley
190. Cap 192. Cover
200. Grinding means 300. Cooling means
B. Bearing G. Tool grinder

Claims (7)

1. A workhead for a tool grinder in which a tool requiring grinding is mounted,
At one side of the work head,
A worm wheel and a worm interlocking with each other,
A housing for housing the worm therein,
And a backlash reducing means for elastically supporting the housing in an upward direction to limit the gap between the worm wheel and the worm.
The apparatus according to claim 1, wherein the backlash reducing means comprises:
A bracket fixed inside the body forming the outer surface of the work head,
An elastic member having an elastic restoring force and contacting one side of the outer surface of the housing,
And a pressing member coupled to one side of the bracket to apply pressure to the elastic member. ≪ Desc / Clms Page number 19 >
The connector according to claim 2, wherein, on one side of the housing,
And a pressing surface for expanding a contact area with the elastic member is provided on the workpiece grinding machine.
The workhead for a tool grinder according to claim 3, wherein the elastic member is located between the pressing member and the housing.
The apparatus of claim 4, wherein the backlash reducing means comprises:
And the worm is pressed against the outer circumferential surface of the portion where the worm gear is not formed.
6. The apparatus of claim 5, wherein a plurality of bearings for guiding rotation of the worm are provided in the work head,
Wherein the backlash abatement means provides pressure in a direction orthogonal to the rotational center of the multiple bearings.
7. The apparatus according to claim 6, wherein, on one side of the pressing member,
And a loosening stopper is provided to prevent the binding force of the pressing member from being released from the bracket.

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