JP2001105312A - Grinding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small grinder in which a dressing and truing device is not greatly projected to the diagonally forward side of a grinding wheel. SOLUTION: In a grinding machine provided with a grinding wheel 2 which is provided on a base 6 to be rotated in a fixed direction by a driving means 10 and which has a tapered grinding part 2a on the outer peripheral surface, and a working station 13 which is provided on the base 6 on one side of the grinding wheel 2 so that it can reciprocate in relation to the grinding wheel 2 and which is capable of grinding the outer peripheral surface of an end part of a work 1 held by a holding means 25 by means of the grinding part 2a of the grinding wheel 2, a dressing and truing device 36 provided with a rotary dresser 5 capable of moving simultaneously in two directions, that is, in a direction parallel to the axis of the grinding wheel 2 and in a direction crossing the same axis at right angles by two forward and reverse driving means 40, 44, is provided on the base 6 on opposite side of the working station 13 with respect to the grinding wheel 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding machine provided with a device for correcting a tapered grinding portion in a grinding wheel.

[0002]

2. Description of the Related Art In a work having an enlarged diameter portion at one end of a shaft portion and an outer peripheral surface of the enlarged diameter portion forming a tapered surface, for example, an engine valve (1) as shown in FIG. The tapered valve face portion (1b) formed on the outer peripheral surface of the grinding wheel (2) of the grinding machine is ground by the tapered grinding portion (2a) of the outer peripheral surface of the grinding wheel (2) of the grinding machine. . That is,
The engine valve (1) gripped by a work gripping / rotating device (not shown) is moved in the direction of the arrow while rotating about the axis, and the valve face (1b) is moved to the grinding portion (2) of the grinding wheel (2).
It is ground by contacting a).

[0003] When a certain amount of work is ground, a grinding wheel
Since the grinding part (2a) of (2) gradually wears and becomes deformed, it is necessary to modify the grinding part (2a) to have a predetermined shape. Conventionally, as shown in FIG. A modification device installed on the base (not shown) diagonally forward of the grinding wheel (2)
(3). That is, a bearing stand (4) mounted on a movable table (not shown) in the retouching device (3).
Is moved in the direction of the arrow from the same direction as the tapered surface of the grinding part (2a), and the grinding part (2a) is modified by the outer peripheral surface of the rotary dresser (5) projecting from the tip of the bearing stand (4). I am trying to do it.

[0004]

As described above, a modification device is provided diagonally forward of the grinding wheel (2), and the bearing stand (4) supporting the rotary dresser (5) is tapered to the grinding portion (2a). In the conventional grinding machine which is moved in the same direction as the surface, the retouching device (3) protrudes greatly to the front of the grinding wheel (2) obliquely forward, so that the entire grinding machine including the base becomes large, and the installation space is reduced. Be constrained.

[0005] When the grinding wheel (2) is replaced, a modification device is used.
(3) becomes the obstacle, and the replacement work becomes troublesome.

In order to deal with these problems, it is conceivable to install the retouching device (3) above the grinding wheel (2). However, in this case, there is a problem that the overall height of the grinding machine becomes large. Occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a small-sized grinding machine having a small projecting dimension toward a slanting front side by changing the arrangement of a modifying device and a moving direction of a rotary dresser. It is intended to be.

[0008]

According to the present invention, the above-mentioned problem is solved as follows. (1) A grinding wheel provided on a base so as to be rotated in a fixed direction by a driving means, and having a tapered grinding portion on an outer peripheral surface. It is provided so that it can reciprocate with respect to the grinding wheel,
And, in a grinding machine having a processing station capable of grinding the end portion outer peripheral surface of the work gripped by the gripping means into a tapered shape by the grinding unit of the grinding wheel, on a base opposite to the processing station in the grinding wheel. , 2
A modification device provided with a rotary dresser which can be simultaneously moved in two directions, that is, a direction parallel to the axis of the grinding wheel and a direction also orthogonal to the axis by the two forward and reverse driving means.

(2) In the preceding paragraph, the modifying device is provided on the base behind the grinding wheel.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. Note that the same members as those in the related art described above are denoted by the same reference numerals and described.

In FIG. 1, a bearing stand (7) is provided on the upper surface of a central portion of the base (6) having an inverted L-shape in plan view, which is slightly rearward (hereinafter, the direction will be described with the front side of the figure as the front). ), A rotating shaft (8) having a grinding wheel (2) attached to the front end thereof is rotatably supported in the front-rear direction.

The grinding wheel (2) has a pulley (9) mounted on a rear protruding end of a rotating shaft (8) and a motor (10) mounted on the rear upper surface of the base (6) slightly to the left. ) Is rotated in a certain direction by a belt (12) wound around the pulley (11).

On the outer peripheral surface of the grinding wheel (2), as in the prior art, a tapered valve face portion (1b) inclined to approximately 45 ° of the umbrella portion (1a) of the engine valve (1) as a work is ground. For this purpose, a tapered grinding portion (2a) is formed which has the same inclination and gradually increases its diameter toward the front.

The grinding wheel (2) is a binder (trade name) in which CBN (cubic boron nitride) abrasive grains are combined with glass fibers as a binder, or ordinary carbon / nitride abrasive grains are combined with a binder. Made of whetstone.

At the upper left side of the grinding wheel (2) on the upper surface of the base (6), a processing station (13) described in detail below is provided.

The lower surface of the first movable table (15) is attached to the left and right first guide rails (14) (14) fixed to the base (6) in the front-rear direction. Ie grinding wheel
It is fitted so as to be movable in a direction parallel to the axis of (2).

A rear end of a first screw rod (16) is screwed into a front end between the two guide rails (14) of the first movable table (15). The front end is a first drive motor (17) such as a servo motor or a stepping motor as forward / reverse drive means fixed to the upper surface of the front end of the base (6).
It is connected to. Thereby, the first movable table (15)
Is moved in the front-rear direction when the first drive motor (17) rotates forward and backward.

A pair of front and rear second guide rails (18) (1) fixed to the upper surface of the first movable table (15) in the horizontal direction.
8), the lower surface of the second movable table (19) is
That is, they are fitted so as to be movable in a direction orthogonal to the axis of the grinding wheel (2).

A right end of a second screw rod (20) is screwed into a left end of the second movable table (19) between the two second guide rails (18). It is connected to a second drive motor (21) such as a servo motor or a stepping motor similar to the above, which is fixed to the upper surface of the left end of the movable table (15).

On the upper surface near the rear end of the second movable table (19), a pair of left and right driving rollers (22) and (22), a geared motor (23) for driving them, A pair of front and rear driven rollers (24) (24) provided on the right side facing the roller (22)
A work holding / rotating device (25) is provided.

Both drive rollers (22) are connected to a second movable table.
(19) A rotary shaft (2
7), the driven gear (28) at the front end is meshed with the drive gear (29) of the geared motor (23), so that the driven gear (28) is rotated in a fixed direction.

The front and rear supports (30) and (30) are arranged so that the driven rollers (24) are opposed to the drive roller (22) by a distance substantially equal to the shaft diameter of the engine valve (1). The shaft is attached to a spindle (31) pivotally supported by the shaft.

A loader head (32) for holding and positioning the shaft end of the engine valve (1) is rotatable forward and backward in a forward direction between the driving roller (22) and the driven roller (24). It is provided as movable.

Above the rear of the base (6), a parallel bar type work supply chute (33) facing obliquely downward is provided, and the engine valves (1) machined in the preceding process are sequentially fed and stored.

The stored engine valves (1) are discharged one by one by alternately operating the upper and lower selector devices (34), and the workpiece reciprocates in the front-rear direction toward the upper side of the processing station (13). The umbrella portion (1a) is supplied rearward between the driving roller (22) and the driven roller (24) while being gripped by the transport means (35).

The processed engine valve (1) is gripped by another work transfer means (not shown) and transferred to the next step. On the right rear side of the grinding wheel (2), that is, on the base (6) on the right side of the bearing stand (7), the grinding wheel (2) described in detail below.
(36) is provided.

A pair of left and right third guide rails (3) fixed in the front-rear direction on the base (6) on the right side of the bearing stand (7).
7) (37) is fitted with a third movable table (38) so as to be movable in the front-rear direction.

A front end of a third screw rod (39) is screwed into a rear end of the third movable table (38) between the two guide rails (37), and a rear end of the third screw (39) is connected to the base (6). It is connected to a third drive motor (40) such as a servo motor or a stepping motor as forward / reverse drive means fixed to the rear upper surface. Thereby, the third movable table (38) is reciprocated in the front-rear direction in the same direction as the axis of the grinding wheel (2) by the operation of the third drive motor (40).

A pair of front and rear fourth guide rails (41) fixed to the upper surface of the third movable table (38) in the left-right direction.
The lower surface of the fourth movable table (42) is fitted to (41) so as to be movable in the left-right direction.

A fourth screw (43) is screwed into a right end of the fourth movable table (42) between the fourth guide rails (41), and a right end of the fourth screw (43) is connected to the fourth movable table (42). It is connected to a fourth drive motor (44) similar to the above, which is fixed to the upper surface of the right end portion of (42). Thereby, the fourth movable table (42)
Is reciprocated in the left-right direction orthogonal to the axis of the grinding wheel (2) by the operation of the fourth drive motor (44).

On the upper surface on the left side of the fourth movable table (42), a bearing base (4) similar to the conventional one is erected in the front-rear direction, and is pivotally supported by this bearing base (4). At the front end of the rotating shaft (45), a rotary dresser (5) having an artificial diamond or the like fixed to the outer peripheral surface is attached.

The rotary dresser (5) includes a pulley (46) fixed to the rear end of the rotating shaft (45) and a fourth movable table (42).
The motor (47) is fixed in a fixed direction by a belt (49) wound around a pulley (48) of the motor (47).

In the grinding machine of the above embodiment, the valve face portion (1b) of the engine valve (1) is ground as follows.

The engine valve (1) discharged from the work supply chute (33) between the two rollers (22) and (24) in the processing station (13) previously retracted diagonally forward of the grinding wheel (2). The umbrella portion (1a) is supplied backward by the work transfer means (35) to be gripped, and is positioned by the loader head (32) (the state of FIG. 1).

Next, the geared motor (23) of the work holding / rotating device (25) is operated to rotate the engine valve (1), and the first and second drive motors (17) and (21).
By operating the first movable table (1
5) and the second movable table (19) are simultaneously moved to the rear and to the right, respectively, and the engine valve (1) has its valve face (1b) as shown in FIG. 2) Grinding unit
(2a) is moved in an oblique direction of 45 ° so as to come into contact therewith.

At this time, the first and second movable tables (15)
The movement of (19) is accurately performed by simultaneously controlling the rotation of both drive motors (17) and (21) based on a control signal issued from a control device (not shown), and the valve face portion (1b)
Is ground by a predetermined grinding allowance by the grinding unit (2a) of the rotating grinding wheel (2).

Grind a certain number of engine valves (1),
When the grinding portion (2a) of the grinding wheel (2) is worn, the grinding portion (2a) is modified in the following manner.

First, the fourth movable table (42) in the modifying device (36) which has been retracted to the right of the grinding wheel (2) in advance.
Is moved to the left by operating the fourth drive motor (44), and as shown by the imaginary line in FIG. 3, the outer peripheral surface of the rotary dresser (5) is moved to the grinding portion (2a) of the grinding wheel (2). ) Contact the rear edge.

Next, the third and fourth drive motors (40) (4)
4) at the same time, the third movable table (38) and the fourth movable table (42) are simultaneously moved forward and to the right, respectively, and as shown by the imaginary line in FIG. (5) is moved in the same 45 ° direction as the inclined surface of the grinding portion (2a).

In this case, the third and fourth movable tables (38)
The movement of (42) is performed accurately by simultaneously controlling the rotations of both drive motors (40) and (44) by a control device (not shown), and by the rotary dresser (5) in which the grinding unit (2a) rotates. It is modified to a predetermined shape.

As described above, in the above embodiment, the grinding wheel (2) is placed on the base (6) on the right side of the grinding wheel (2).
Third movable table movable in the same longitudinal direction as the axis of
(38) and a modification device comprising a fourth movable table (42) which is also movable in the left-right direction orthogonal to the axis of the grinding wheel (2).
(36), and these movable tables (38) and (42) are simultaneously moved by the third and fourth drive motors (40) and (44), respectively, so that the rotary dresser (5) The grinding wheel (2) is moved to modify the grinding portion (2a) of the grinding wheel (2).

For this reason, as in a conventional grinding machine in which the rotary dresser (5) and its bearing base (4) are moved in the same direction as the inclination direction of the grinding portion (2a), the entire remodeling device is a grinding wheel. The grinder does not largely protrude obliquely forward in (2), so that the entire grinding machine including the base (6) does not increase in size, and space can be saved when the grinder is installed. Also,
Since the modification device (36) is provided on the base (6) behind the grinding wheel (2), the replacement of the grinding wheel (2) is also facilitated.

According to the present invention, as shown in FIG.
The grinding portion (2a) can be applied to an inverted tapered inclined surface opposite to that described above, that is, a tapered surface whose diameter gradually decreases toward the front.

In this case, the rotations of both drive motors (40) and (44) may be controlled such that the rotary dresser moves obliquely forward in the direction indicated by the arrow, that is, from the outside to the inside. .

The valve face of the engine valve (1)
A processing station (13) for grinding (1b) is provided on the left side of the rear side of the grinding wheel (2) in a direction opposite to that of the above-described embodiment, and moves the engine valve (1) obliquely forward. I just need.

The present invention can of course be applied to the grinding of a workpiece other than the engine valve (1).

[0047]

According to the first aspect of the present invention, there is provided a modification device provided with a rotary dresser which can move in a direction parallel to the axis of the grinding wheel and in a direction perpendicular to the axis on the side of the grinding wheel. And the rotary dresser can be simultaneously moved in two directions by two forward / reverse driving means, so that the rotary dresser can be freely moved along the tapered grinding portion of the grinding wheel, and the portion can be easily moved. Can be modified.

As a result, unlike the related art, it is not necessary to provide a retouching device obliquely forward of the grinding wheel, and the retouching device does not protrude greatly obliquely forward of the grinding wheel, so that the grinding machine does not become large. Therefore, the installation space of the grinding machine is not restricted.

According to the second aspect of the present invention, since the front side of the grinding wheel is opened, the replacement work becomes easy.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a grinding machine of the present invention.

FIG. 2 is an enlarged plan view of essential parts showing essentials of grinding a valve face part by a grinding wheel.

FIG. 3 is an enlarged plan view of a main part showing how to modify a grinding part of a grinding wheel using a rotary dresser.

FIG. 4 is an enlarged plan view of a main part, similarly showing a procedure for repairing a grinding wheel having a different shape of a grinding part.

FIG. 5 is an enlarged plan view of a main part showing a procedure for repairing a grinding part in a conventional grinding machine.

[Explanation of symbols]

 (1) Engine valve (work) (1a) Head (1b) Valve face (2) Grinding wheel (2a) Grinding part (4) Bearing stand (5) Rotary dresser (6) Base (7) Bearing stand (8 ) Rotating shaft (9) (11) Pulley (10) Motor (12) Belt (13) Processing station (14) First guide rail (15) First movable table (16) First screw rod (17) 1 drive motor (18) 2nd guide rail (19) 2nd movable table (20) 2nd screw (21) 2nd drive motor (22) drive roller (23) geared motor (24) driven roller (25) Work holding and rotating device (26) (30) Abutment (27) Rotary shaft (28) Drive gear (29) Drive gear (31) Support shaft (32) Loader head (33) Work supply chute (34) Selector device (35) Work transfer means (36) Modifying device (37) Third guide rail (38) Third movable table (39) Third screw rod (40) Third drive motor (forward / reverse drive means) (41) Fourth guide rail (42) Fourth movable table (43) Fourth screw (44) fourth drive motor (forward and reverse drive means) (45) rotation axis (46) (48) pulley (47) Motor (49) Belt

Claims (2)

[Claims] 1. A grinding wheel provided on a base so as to be rotated in a certain direction by a driving means and having a tapered grinding portion on an outer peripheral surface; A grinding station comprising a processing station provided so as to be able to reciprocate with respect to the grinding wheel, and capable of grinding an end outer peripheral surface of a workpiece gripped by gripping means in a tapered shape by a grinding portion of the grinding wheel. On the base on the opposite side of the processing station of the grinding wheel, two forward and reverse drive means can be simultaneously moved in two directions: a direction parallel to the axis of the grinding wheel and a direction orthogonal to the axis. A grinding machine provided with a retouching device having a rotary dresser. 2. The grinding machine according to claim 1, wherein the modifying device is provided on a base behind the grinding wheel.