JPH11347916A - Honing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost and long life honing device which allows establishing high-speed, low-noise recipocative motions of a honing head. SOLUTION: This honing device 1 is composed of a honing head 2 furnished at the forefront with a grinding wheel, a rotating means 3 to rotate the head 2, a housing 20 to support the head 2 rotatably, a reciprocating means 5 to reciprocate the head 2 linearly, and a stay 6 to couple the housing 20 with the reciprocating means 5. The reciprocating means 5 consists of a linear motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a honing apparatus for performing honing on an inner surface of a cylinder provided on a workpiece, and more particularly to a honing apparatus for reciprocating a honing head using a linear motor.

[0002]

2. Description of the Related Art Conventionally, a honing machine disclosed in Japanese Patent No. 26099989 is known as an apparatus for performing honing by pressing a grindstone of a honing head against a cylindrical inner surface of a workpiece while rotating and reciprocating the honing head. ing. The honing apparatus has a honing tool (hereinafter referred to as a honing head) provided with a grindstone at a tip end, and has a rotating spindle and a spindle rotating drive unit as rotating means for rotating the honing head.

The honing apparatus has a slide body (hereinafter referred to as a housing) for rotatably supporting the honing head, a main shaft reciprocating drive unit as reciprocating means for reciprocating the honing head. It has a guide rod as a stay connecting the housing and the main shaft reciprocating drive unit. The main shaft reciprocating drive unit has a hydraulic cylinder controlled by a hydraulic control valve or the like. The hydraulic cylinder is a drive source driven by hydraulic pressure.

[0004]

However, the conventional honing apparatus has the following problems. That is,
The honing apparatus reciprocates the honing head by hydraulically driving a hydraulic cylinder. Therefore, in order for the honing head to reciprocate at a constant speed, the viscosity of the hydraulic oil of the hydraulic cylinder must be kept constant. Therefore, the honing apparatus requires a temperature controller for keeping the temperature of the hydraulic oil constant, resulting in high cost. In addition, the resistance of the working oil prevents the reciprocating motion of the honing head from increasing in speed.

In some cases, a servo motor and a ball screw controlled by an NC device are used as the spindle reciprocating drive unit, and the honing head is reciprocated by rotating the ball screw by the servo motor. However,
In this case, since the ball screw is worn, it is difficult to extend the life of the honing device.
In addition, noise is generated by rotating the ball screw.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and provides a honing processing apparatus capable of achieving high speed reciprocating motion and low noise of a honing head, and having a low cost and a long life. What you want to do.

[0007]

According to a first aspect of the present invention, there is provided a honing head having a grindstone provided at a tip thereof, a rotating means for rotating the honing head, a housing for rotatably supporting the honing head, and In a honing apparatus comprising a reciprocating means for linearly reciprocating a head and a stay connecting the housing and the reciprocating means, the reciprocating means is a linear motor.

It is most remarkable in the present invention that the reciprocating means for reciprocating the honing head is a linear motor, and the linear motor is connected to the housing supporting the honing head by the stay. That is.

The reciprocating means (hereinafter referred to as a linear motor) has a structure in which a normal rotary motor such as an AC servomotor, a stepping motor, an induction motor or the like is linearly developed, and has no rotating portion. Also,
The linear motor includes a field side and an armature side that are arranged facing each other. When a current is applied to the field side, a magnetic field is generated and changed, and the relative positions of the two are changed in a non-contact state. It is a driving source. The reciprocating means is
One of the field side and the armature side is connected to the stay.

Next, the operation of the present invention will be described. In the honing apparatus of the present invention, the honing head is linearly reciprocated together with the housing connected thereto by electrically driving the linear motor as the reciprocating means.

[0011] Therefore, the reciprocating motion of the honing head can be performed without using the hydraulic cylinder shown in the conventional example. Therefore, the above-mentioned honing apparatus can be reduced in cost as compared with the conventional one without the need for the hydraulic oil temperature controller shown in the conventional example. In addition, since there is no hydraulic oil acting as a resistance in the reciprocating motion, the speed of the reciprocating motion of the honing head can be increased. Further, since the reciprocating means is a non-contact type, and the frictional resistance accompanying the driving thereof can be greatly reduced, the speeding up is further facilitated.

Further, the honing head can reciprocate without using the ball screw, which is a worn part shown in the conventional example. Therefore, the service life of the honing apparatus can be extended as compared with the related art.
Further, since the reciprocating means is of a non-contact type, and the number of wear parts accompanying the driving thereof can be reduced, the life of the honing apparatus can be more easily extended. Further, in the reciprocating motion, noise generated by the rotational motion of the ball screw can be prevented, and the noise of the reciprocating motion of the honing head can be reduced.

As described above, according to the present invention, it is possible to provide a honing processing apparatus which can achieve high speed reciprocating motion of the honing head and low noise, and which is low in cost and has a long life.

Next, according to a second aspect of the present invention, the linear motor includes a fixed portion that is linearly arranged to change the magnetic field linearly, and a magnetic field of the fixed portion that is arranged facing the fixed portion and faces the fixed portion. It is preferable that the stay comprises a movable portion that moves linearly by the change, and the movable portion is connected to the stay.

In this case, the magnetic field is generated and changed in the fixed portion as described above, and the movable portion is moved as described above. That is, the honing apparatus can control the movement of the movable part by supplying electricity to the fixed part that does not move. Therefore, it is possible to prevent generation of noise in the energization signal for controlling the position of the honing head.
Therefore, highly accurate honing can be performed.

Next, the stay has a guide member for guiding the housing in a linear direction, and the guide member slides on a linear rail provided in a honing apparatus. Preferably, they are movably fitted. In this case, the honing head can be smoothly reciprocated linearly with a simple structure.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment A honing apparatus according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 4, the honing apparatus 1 according to the present embodiment includes a honing head 2 having a grindstone 27 at a tip 21, a rotating unit 3 for rotating the honing head 2, and a rotating honing head 2. The housing 20 includes a housing 20 for supporting the housing, a linear motor 5 for reciprocating the honing head 2 linearly, and a stay 6 for connecting the housing 20 to the linear motor 5.

Hereinafter, description will be made step by step. As shown in FIG. 1, the linear motor 5 includes a fixed portion 51 that is linearly arranged and changes the magnetic field in a straight line, and a movable portion that faces the fixed portion 51 and linearly moves due to the magnetic field change of the fixed portion 51. 52. The field side of the linear motor 1 is the fixed part 51, and the armature side is the movable part 52.

As shown in FIG. 2, the fixed portion 51 of the linear motor 5 has a field coil 515 and a lead wire 519 for energization. Further, the fixing portion 51 is fixed to a stand stay 115 that is provided upright on the stand 11 (FIG. 1) of the honing apparatus 1. On the other hand, the movable portion 52 of the linear motor 5 has permanent magnets 523 and 527 arranged in a state where the polarity is alternately reversed. Also,
A fixed gap is provided between the N-pole permanent magnet 523 and the S-pole permanent magnet 527. The movable part 52 is connected and fixed to the upper end of the stay 6.

Next, as shown in FIG. 1, the lower end of the stay 6 is firmly fixed to the upper side surface of the housing 20 by a fixing member 62 via bolts and pins (not shown). . The stay 6 has an LM guide 620 as the guide member via the fixing member 62 and the housing 20.

That is, as shown in FIG. 1, the housing 20 is a box-like body having a substantially U-shaped cross section, and the LM guide 620 is fixed to upper and lower side surfaces thereof. The LM guide 620 has a structure in which steel balls, which are rolling elements, circulate inside the LM guide 620, and is slidably fitted to the linear rail 116 with relatively little frictional resistance.

The honing head 2 is rotatably supported by a ball bearing 202 provided on the lower surface of the housing 20, as shown in FIG. On the other hand, the spindle 33 of the rotating means 3 is rotatably supported by a ball bearing 203 provided on the upper surface thereof.

Next, as shown in FIG. 1, the rotating means 3 comprises a spindle 33 rotatably supported by the housing 20, a rotating spline shaft 32 connected to the upper end of the spindle 33, and the honing And a motor 31 for rotating the head 2.

A pulley and a belt (not shown) for transmitting the rotation of the motor 31 to the rotating spline shaft 32 are provided between the motor 31 and the rotating spline shaft 32. The rotating spline shaft 32 is rotatably supported by a bearing disposed on the stand 11 of the honing apparatus 1 and is held slidably in the vertical direction. The rotating spline shaft 32 is connected to the honing head 2 via the spindle 33. The above 3
The axis of the user is arranged along the vertical direction and is on the same straight line.

Next, as shown in FIG. 4, the honing head 2 is disposed in a hollow cylindrical tip portion 21 having a small-diameter lower portion and a large-diameter upper portion, and is disposed in the hollow portion of the tip portion 21. It has a wedge 26 and a grindstone 27 for pressing against a cylindrical inner surface 70 which is a work surface of the workpiece 7.

The wedge 26 is disposed so as to be slidable in the vertical direction in the hollow portion of the distal end portion 21. The wedge 26 is engaged with a spring 28 urged to push the wedge 26 upward at the upper end 263 thereof. On the other hand, the lower end portion 267 is tapered, and is in contact with the tapered upper surface 273 of the grinding stone 27 facing the lower end 267. Also, the grinding wheel 27 is
It is provided so as to be slidable in the radial direction with respect to a through hole provided in the lower side wall of the tip portion 21.

Next, as shown in FIGS. 1 and 3, the honing apparatus 1 has a cut amount adjusting means 4 for lowering the wedge 26 and pushing out the grinding stone 27 in the radial direction. The cutting amount adjusting means 4 includes the wedge 2.
6, a push rod 49 for pressing the upper end portion 263 downward.
A servo motor 4 for moving the push rod 49 downward.
1 and an engaging pin 48, a sleeve 47, a ball bearing 46, a slide block 45, and a rotary shaft 4 connecting the two.
4, a cutting spline shaft 43 and a gear 42.

The push rod 49 is disposed above the wedge 26 in the hollow portion of the spindle 33 as shown in FIG. The upper portion is engaged with the above-mentioned engaging pin 48 which is provided penetrating along the radial direction. The engagement pin 48 has both ends of the spindle 3
3 is fixed to the cylindrical sleeve 47 rotatably arranged on the outer peripheral surface of the spindle 33 in a state of protruding from the slide hole 333. In addition, this sleeve 47
Are supported by the slide block 45 via the ball bearing 46.

The slide block 45 is provided on the rotating shaft 44 rotatably supported by the housing 20.
Are slidably screwed up and down. That is,
Nuts 81, 8 fixed to the slide block 45
2 is screw-coupled to the outer peripheral screw 441 of the rotary shaft 44, and converts the rotational motion of the rotary shaft 44 into vertical sliding of the slide block 45. The rotating shaft 44 is connected to the cutting spline shaft 43. The cutting spline shaft 43 is rotatably supported by a bearing disposed on the stand 11 of the honing apparatus 1 and is slidably held in the vertical direction. The cutting spline shaft 43
Is connected to the servomotor 41 via the gear.

Next, the operation of this embodiment will be described. Using the honing apparatus 1 of the present embodiment, the cylindrical inner surface 7 of the workpiece 7 is
To perform honing processing on the lead wire 519, first, the field wire 515 of the linear motor
And a magnetic field is formed in the fixed portion 51.
Then, the energization is controlled to generate an attractive force or a repulsive force between the permanent magnets 523 and 527 of the linear motor 5.

As a result, as shown in FIG. 1, the movable portion 52 of the linear motor 5 is moved downward, and the honing head 2 is moved together with the stay 6 and the housing 20.
Is lowered from the original position S to a position B on the lower surface of the workpiece 7 held by a jig (not shown).

Next, the energization of the field coil 515 of the linear motor 5 is controlled to move the movable portion 52 upward, so that the position of the honing head 2 is shifted from the position B to the position of the workpiece 7. It is raised to the position H on the upper surface. Then, the honing head 2 is repeatedly caused to reciprocate between the lower end position B and the upper end position H. At the same time, the motor 31 of the rotating means 3 is driven to rotate the honing head 2 together with the rotating spline shaft 32 and the spindle 33. Thus, the grindstone 27 of the honing head 2 is helically brought into contact with the cylindrical inner surface 70 of the workpiece 7.

Further, reciprocation of the honing head 2,
With the rotation, the servo motor 41 of the cutting amount adjusting means 4 is rotated.
To extrude the grindstone 27 of the honing head 2 in the radial direction, and adjust the amount of cut into the cylindrical inner surface 70 of the workpiece 7.

Specifically, when the servo motor 41 is driven, the rotary shaft 44 rotates via the gear 42 and the cutting spline shaft 43. Then, the slide block 45 is moved downward by the nuts 81 and 82. At the same time, the sleeve 47, the engagement pin 48, and the push rod 49 move downward. Then, the wedge 26 of the honing head 2 is moved by the push rod 49.
Is pressed downward to lower the wedge 26. The sleeve 47, the engagement pin 48,
The push rod 49 rotates together with the spindle 33 via the ball bearing 46.

Thus, the lower end 2 of the wedge 26 is formed.
67 presses the upper side surface 273 of the grindstone 27 downward. At this time, since both are tapered, the grinding stone 2
7 is extruded in the radial direction at the tip 21 of the honing head 2 and presses the cylindrical inner surface 70 of the workpiece 7. The reciprocation and rotation of the honing head 2 and the expansion of the grinding stone 27 in the radial direction are performed until the cylindrical inner surface 70 of the workpiece 7 has a predetermined radius.

When the honing process is completed,
The drive of the servomotor 41 of the cutting amount adjusting means 4 is stopped, the wedge 26 is raised by the spring 28, and the expansion (pressing) of the grinding stone 27 is stopped. At the same time, the driving of the motor 31 of the rotating means 3 is stopped, and the rotation of the honing head 2 is stopped. Then, the energization of the field coil 515 of the linear motor 5 is controlled to move the movable portion 52 upward, thereby raising the position of the honing head 2 from the position B to the original position S.

As described above, in the honing apparatus 1 of this embodiment, the honing head 2 is reciprocated linearly together with the housing 20 connected thereto by electrically driving the linear motor 1. Therefore, the honing head 2 can perform the reciprocating motion without using the hydraulic cylinder shown in the conventional example. Therefore, the honing apparatus 1 can be reduced in cost as compared with the conventional one without the need for the hydraulic oil temperature controller shown in the conventional example. In addition, since there is no hydraulic oil acting as a resistance in the reciprocating motion, the speed of the reciprocating motion of the honing head 2 can be increased.
Further, the linear motor 5 includes a fixed portion 51 and a movable portion 5.
2 is a non-contact type that does not come into contact with the LM guide 620, and the frictional resistance associated with the drive is limited to the friction between the linear rail 116 and the LM guide 620, and can be greatly reduced. for that reason,
The speeding up is further facilitated.

Further, the honing head 2 can reciprocate without using the ball screw which is a worn part shown in the conventional example. Therefore, the service life of the honing apparatus 1 can be extended as compared with the related art. Further, as described above, the linear motor 5 is of a non-contact type, and the number of wear parts accompanying its driving can be limited to the linear rail 116 and the LM guide 620. Therefore, the life of the honing apparatus 1 can be more easily extended. In addition, in the reciprocating motion, noise generated by the rotational motion of the ball screw is prevented,
The noise of the reciprocating motion of the honing head 2 can be reduced.

The linear motor 5 includes the fixed part 51 corresponding to the field and the movable part 52 corresponding to the armature.
The movable portion 52 is connected to the stay 6. As a result, the honing apparatus 1 can control the movement of the movable section 52 by energizing the fixed section 51 that does not move as described above. Therefore, it is possible to prevent generation of noise in the energization signal for controlling the position of the honing head 2. Therefore, highly accurate honing can be performed.

The stay 6 has an LM guide 620 as a guide member, and the LM guide 620 is slidably fitted on the linear rail 116 provided in the honing machine 1. Therefore, the honing head 2 can be smoothly reciprocated linearly with a simple structure.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of a honing apparatus in an embodiment.

FIG. 2 is an explanatory diagram of a linear motor in the embodiment.

FIG. 3 is an explanatory sectional view of the inside of a housing in the embodiment.

FIGS. 4A and 4B are cross-sectional explanatory views of a honing head, (B) a view in the direction of arrow X, and (C) a cross-sectional view in the direction of line ZZ in the embodiment.

[Explanation of symbols]

 1. . . Honing equipment, 2. . . Honing head, 20. . . Housing, 3. . . 3. rotating means; . . 4. Cut depth adjusting means; . . Linear motor (reciprocating means), 51. . . Fixing part, 515. . . Field coil, 52. . . Movable part, 523, 527. . . 5. permanent magnet, . . Stay, 620. . . LM guide (guide member),

Claims (3)

[Claims] A honing head provided with a grindstone at a tip thereof, a rotating means for rotating the honing head, a housing for rotatably supporting the honing head,
A honing apparatus comprising a reciprocating means for linearly reciprocating the honing head and a stay connecting the housing and the reciprocating means, wherein the reciprocating means is a linear motor. 2. The linear motor according to claim 1, wherein the linear motor is linearly arranged and has a fixed portion for changing a magnetic field linearly, and a movable portion disposed opposite to the fixed portion and linearly moved by the magnetic field change of the fixed portion. Wherein the movable portion is connected to the stay. 3. The stay according to claim 1, wherein the stay has a guide member for guiding the housing in a linear direction, and the guide member is slidably fitted on a linear rail provided in a honing apparatus. A honing machine, characterized in that