JPH11207587A - Hole inner surface grinding device - Google Patents

Abstract

(57) [Problem] To provide a hole inner surface grinding device capable of automatically performing the grinding operation of the inner surface of the hole to reduce the burden on the operator and obtaining a uniform finish. A hole inner surface grinding device (10) includes a motion rod (21) having a grinding wheel (23) rotatably driven by an air grinder (22) at a tip thereof on a vertical swing movement mechanism (30).
Is pivotally supported by the universal support mechanism 55, and the support position of the motion rod 21 in the inclined state at the rear end side by the eccentric drive mechanism 60 is circularly moved by the eccentric drive mechanism 60 to turn the grinding wheel 23. The grinding mechanism 20 configured to be driven is provided so as to be movable in the front-rear direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hole inner surface grinding apparatus which is used for, for example, removing the sand or scale by grinding the inner surface of a hole formed in a casting with a grinding wheel or the like.

[0002]

2. Description of the Related Art For example, to remove molding sand or scale adhering to the inner surface of a hole formed in a casting, a grinder for rotating a rotating file or a grinding wheel is attached to the tip of a rod-like support rod member. Using a dedicated tool, the operator manually kneads the support bar member and moves the rotating file or grinding wheel in the axial direction while rotating along the inner surface of the hole.

[0003]

However, the manual work by the above-mentioned conventional worker has a problem that the work is hard work for the worker, the work efficiency is poor, and it is difficult to obtain a uniform finish.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a function of automatically performing a grinding operation on an inner surface of a hole to reduce a burden on an operator and obtain a uniform finish. An object is to provide a grinding device.

[0005]

According to a first aspect of the present invention, there is provided a hole inner surface grinding apparatus comprising: a shaft member having a grinding tool rotatably driven by a rotary driving means at a tip thereof; A swivel driving means for turning the shaft member at a rear end side of a support portion of the shaft member supported by the free support means and eccentrically from a support center of the free support means to perform a swivel drive. While the grinding tool is being rotated by the rotation driving means, the support position of the turning drive means is circularly moved by the turning drive means in a state where the shaft member is inclined about the free support means as a fulcrum, thereby turning the grinding tool. And it is characterized in that it is configured to grind the inner surface of the hole of the work.

Further, in addition to the above configuration, one of the workpiece and the grinding mechanism is supported and movably supported substantially in parallel with the extending direction of the shaft member.

Further, the turning drive means includes an elastic urging member that presses and urges the shaft member to incline the shaft member, so that the urging force of the elastic urging member increases the turning diameter of the grinding tool. Characterized in that it is configured to operate.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view, viewed from the rear side, showing the entire configuration of a configuration example of a hole inner surface grinding apparatus according to the present invention, FIG. 2 is a front view, FIG.
FIG. 3 is a sectional view taken along line AA of FIG. 2.

The illustrated hole inner surface grinding apparatus 10 includes a grinding mechanism 20.
The workpiece 1 is a cast part forming a saddle of a main bearing of a marine diesel engine, and an inner peripheral surface of a fastening bolt hole (a hole 1A to be ground). As shown in a partial perspective view of FIG. 5, a grinding wheel 23 serving as a grinding tool of an air grinder 22 serving as a rotation driving means provided at a tip of a motion rod 21 serving as a shaft member to remove molding sand and scale. Things.

The workpieces 1 are stacked and arranged in a plurality of stages in front of the hole inner surface grinding device 10 with the holes 1A to be ground facing the device 10 side, and the hole inner surface grinding device 10 is moved up and down by a swinging movement mechanism 30. The grinding mechanism 23 is moved up, down, left, and right so that the grinding wheel 23 corresponds to the hole 1A to be ground of the work 1, and while the air grinder 22 rotates the grinding wheel 23, the turning drive mechanism 50 of the grinding mechanism 20 performs motion. The rod 21 is moved back and forth while making a circular motion in an inclined state to grind the inside of the hole 1A to be ground.

Hereinafter, each part of the hole inner surface grinding apparatus 10 will be described in detail. As shown in a perspective view from the front side in FIG. 6, the lifting / lowering swinging movement mechanism 30 is provided with a lifter 32 that can swing in the front-rear direction on a lower movement frame 31 that can move in the left-right direction. The grinding mechanism 20 is configured to be supported on the upper surface of the device so as to be swingable in the left-right direction.

The lower moving frame 31 is formed by assembling an angle into a flat rectangular shape, and has wheels 33 provided at four corners with the direction of the rotation axis thereof in the front-rear direction. Wheel 3
3 is adapted to be fitted on a mountain-shaped rail 34 laid on the floor surface and to rotate along the rail 34, whereby the lower moving frame 31 (that is, the lifter 32).
Is movable in the left-right direction.

The lifter 32 is configured to support an upper table 32C above a lower base 32A via a lifting link mechanism 32B, and to be able to drive this upper table 32C up and down by a lifting hydraulic cylinder (not shown). The lower base 32A is pivotally supported at its front end by the lower moving frame 31 via a pivot shaft 31A, and is supported at its rear end by a front-back tilt hydraulic cylinder 38 (shown in FIG. 2). By driving the tilt hydraulic cylinder 38, the rear end moves up and down to be tiltable.

On the upper table 32C of the lifter 32, the grinding mechanism 20 is installed via its guide frame 40.

The guide frame 40 is a long rectangular frame formed by assembling a vertical frame member 41 on both left and right sides and a horizontal frame member 42 on both front and rear sides. A pair of front and rear cross beams 43 (43F, 43R)
Is a holding bracket 32D fixed to the upper table 32C.
And the front cross beam 43F is connected to the upper table 32C via the restriction link 32E.

One end of the restriction link 32E is
F, and the other end is pivotally connected to the upper table 32C so as to regulate the amount of movement of the guide frame 40 on the upper table 32C.

The front and rear cross beams 43F and 43R protrude laterally from one of the vertical frame members 41, and their ends are bent upward at right angles to form a vertical portion 43A. The upper table 32C is attached to the female screw 44 provided.
The left and right swing operation screw 35 provided on the side of the screw is screwed.

The left and right swing operation screw 35 is rotatably supported on a bracket plate 36 fixed to a side surface of the upper table 32C with its axial direction being the left and right direction.
An operation handle 37 is provided at an outer end protruding outside the bracket plate 36.

As described above, the guide frame 40 installed on the upper table 32C of the lifter 32 moves the female screw 44 of the vertical part 43A of the cross beam 43 by rotating the left and right swing operation screw 35 through the handle 37. It is operated to move left and right on the upper table 32C within the range of restriction by the restriction link 32E. Therefore, by adjusting the amount of rotation of the front and rear left and right swing operation screws 35, the upper table 3
It can be set to an arbitrary angle by swinging over 2C in the left and right direction (within a horizontal plane) within a predetermined angle range.

The elevating / moving and swinging mechanism 30 having the above-described structure.
Can move the guide frame 40 (that is, the grinding mechanism 20) up and down by driving the lifter 32;
5 can be swung in the horizontal direction in the horizontal plane, and the rear end can be swung up and down with the pivot shaft 31A as a fulcrum (with the front end as a fulcrum) by the driving of the front-rear tilt hydraulic cylinder 38. The frame 31 is supported so as to be movable left and right by moving along the rails 34.

In the grinding mechanism 20, a swing drive mechanism 50 that supports the motion rod 21 so as to be capable of swing drive is provided on the guide frame 40 so as to be movable in the front-rear direction (parallel to the direction in which the motion rod 21 extends). It is configured.

The motion rod 21 is formed of a steel pipe, and is supported by a turning drive mechanism 50 near its rear end. An air grinder 22 is attached to the front end, and a rear end is connected to a compressed air supply line (not shown) via a connector. Compressed air from the compressed air supply line passes through the inside to the air grinder 22. It is being supplied. At the rear end, a balance weight 24 for balancing with the air grinder 22 with a free support mechanism 55 of the turning drive mechanism 50 described later as a fulcrum is mounted.

As shown in FIG. 7 which is a partially cross-sectional enlarged view of FIG. 7 and FIG.
The movable base 51 is constituted by a free support mechanism 55 provided at a front end of the movable base 51 as a free support means, and an eccentric drive mechanism 60 provided at a rear end side of the movable base 51 as a turning drive means. The motion rod 21 is supported, and the eccentric drive mechanism 60 is configured to drive the rear end of the motion rod 21 in a circular motion.

As shown in FIG. 9, which is a cross-sectional view taken along the line CC of FIG. 7, the free support mechanism 55 has a rectangular horizontal rotating frame 55C mounted on a support plate 55B erected on a base 55A. A bearing member 55D is rotatably supported by the rotating shaft 55H, and is rotatably supported by a longitudinal swinging rotating shaft 55V orthogonal to the horizontal rotating shaft 55H inside the horizontal rotating frame 55C. Is supported so as to be able to swing freely.

The eccentric drive mechanism 60 has an operation disk 62 rotatably mounted on the inner periphery of a support member 61 erected on the movable base 51 with the center axis thereof in the front-rear direction via a bearing 61A.

The operation disk 62 is a disk having a predetermined thickness, and a slit 62A having a predetermined width is formed in the center thereof along the radial direction. A spherical bearing 63 is formed in the slit 62A by an outer ring 63B. An eccentric spring 64 as an elastic biasing member and an eccentric amount defining stopper 65 are arranged with the spherical bearing 63 interposed therebetween so as to be slidably movable along the slit 62A (in the radial direction of the operation disk 62). Has been established. That is, the eccentric spring 64 and the eccentric amount defining stopper 65 are arranged so as to correspond to the diameter of the operation disk 62 with the spherical bearing 63 interposed therebetween.

On the front side surface of the operation disk 62, a ring-shaped rotary drive sprocket 62C is connected via a connection ring 62B.
Is fixed, and the rotary drive sprocket 62C
A sprocket 66A fixed to a spindle of a turning gear motor 66 disposed on the upper surface of the support member 61 is linked by a chain 67 so that the operation disk 62 is driven to rotate by the turning gear motor 66. .

The spherical bearing 63 has a square outer ring 63B on the outside of an inner ring 63A having a spherical outer surface.
Are slidably fitted, and the inner ring 63A is connected to the motion rod 21 via a bush type bearing 63C.
It is attached in an extrapolated state. The inner ring 63A is rotatable relative to the motion rod 21 by sliding between the inner periphery of the bush-shaped bearing 63C and the outer periphery of the motion rod 21.
Are adapted to rotatably support the motion rod 21.

The eccentric spring 64 is a compression coil spring whose end is formed by a slit 62A of the operation disk 62.
And the other end thereof abuts against the flat outer surface of the spherical bearing 63 (outer ring 63B) and is urged forward by its elastic urging force.

The stopper 65 for regulating the amount of eccentricity is
A contact portion 65B having a flat end surface is formed at the distal end of A, and is screwed and fixed to the end bottom surface of the operation disk 62 with a screw portion 65A, and the end surface of the contact portion 65B is a spherical bearing 63.
The outer ring 63B comes into contact with the flat outer surface. The position of the contact portion 65B from the center of the operation disk 62 is
By adjusting the screwing amount of the screw portion 65A to the operation disk 62, the screw portion 65A can be variably adjusted.

The eccentric drive mechanism 60 constructed as described above
Then, the spherical bearing 63 is pressed by the contact portion 65B of the eccentricity regulating stopper 65 by the biasing force of the eccentric spring 64, and the position of the spherical bearing 63 in the operation disk 62 is determined. Therefore, the position of the spherical bearing 63 from the center of the operating disk 62 is displaced by changing the amount of projection of the eccentric amount regulating stopper 65 into the slit 62 </ b> A by adjusting the amount of screwing thereof (reducing it in FIG. 7). Eccentricity).

The center of the operation disk 62 (that is, the support member 61) is set at the same height as the center (support position) of the free support mechanism 55. Therefore, the state in which the spherical bearing 63 is located at the center of the operation disk 62. Then motion rod 21
Is supported horizontally, and the spherical bearing 63 is
Is eccentric from the center of FIG. 7 (eccentric toward the upper side in FIG. 7), the angle is inclined at an angle corresponding to the amount of eccentricity with the position supported by the universal support mechanism 55 as a fulcrum.

The operating disk 62 is driven to rotate by the revolving gear motor 66 in a state where the motion rod 21 is supported at a position eccentric from the center of rotation (the state where the motion rod 21 is inclined). The supported portion is driven in a circular motion (at this time, the spherical bearing 63 functions). As a result, the motion rod 21 changes its inclination direction about the position supported by the free support mechanism 55 as a fulcrum, and its end pivots.

The tilt angle of the motion rod 21 is set by positioning the spherical bearing 63 by the eccentric amount stopper 65 as described above, and the set tilt angle is maintained in a free state where no external force acts. In this manner, the motion rod 21 which is tilted at the set tilt angle in the free state can be swung to the side closer to horizontal (the side where the tilt is eliminated) by compressively deforming the eccentric spring 64. In the state of the swing operation, the motion rod 21 is urged to swing to the set tilt angle side by the elastic return force of the eccentric spring 64. For this reason, the grinding wheel 23 of the air cylinder 22 provided at the tip of the motion rod 21 is an obstacle (a surface to be ground).
When the inclination to the set angle is hindered by contact with the eccentric amount, and the inclination angle is less than the set inclination angle defined by the eccentric amount regulating stopper 65, the eccentric spring 64 acts on the motion rod 21 by the elastic return force. In moment,
The grinding wheel 23 acts so as to press and urge the obstacle (a surface to be ground). The urging force of the grinding wheel 23 is proportional to the elastic return force of the eccentric spring 64,
It can be set large by increasing the elastic return force of.

An eccentric reset air cylinder 56 is provided adjacent to the rear side of the support member 61.

The eccentric reset air cylinder 56 is provided with a vertical motion rod immediately below the motion rod 21 adjacent to the support member 61, and a support plate 56A is horizontally mounted at the tip of the motion rod. Thus, the support plate 56A moves up and down.
The lifting amount of the support plate 56A is set at the uppermost position.
A is set so that the motion rod 21 can be supported horizontally by A.

Thus, the operation disk 62 is moved to a position where the eccentric spring 64 is on the upper side and the eccentric spring 64 and the eccentric amount regulating stopper 65 are vertically arranged (a position rotated by 180 ° from the state shown in FIG. 8; When the motion rod 21 is in a swinging state (when the spherical bearing 63 is eccentric), the eccentric reset air cylinder 56 is driven in this state. The plate 56A is the motion rod 21
Is compressed to lift the eccentric spring 64 upward and to support it horizontally. In this state, there is a gap between the outer surface of the outer ring 63B of the spherical bearing 63 and the contact portion 65B of the eccentricity defining stopper 65.

Here, in order to stop the operation disk 62 at the eccentric release position, a position defining limit switch (not shown) is provided at a predetermined position on the front side surface of the support member 61, and at a predetermined position on the front surface of the operation disk 62. No operation member is provided, and a detection signal of the position-limiting switch is input to a control device that controls the rotation of the turning gear motor 66, and the control device turns the position-limiting switch by the rotation of the operation disk 62. When the rotation of the turning gear motor 66 is stopped at the time of the operation (that is, the rotation of the operation disk 62 is stopped), the eccentricity is released.

The moving base 51 of the turning drive mechanism 50 is slidably fitted at both left and right edges of a guide rail 45 disposed inside the left and right vertical frame members 41 of the guide frame 40. Thereby, the turning drive mechanism 50 can move along the vertical frame member 41 (guide rail 45) of the guide frame 40 (that is, in the front-back direction).

The front and rear ends of the movable base 51 are connected to both ends of a drive chain 48. The drive chain 48 is connected to the inside of the front frame 42F at the front end of the guide frame 40 and to the rear frame 42R at the rear end. The front-rear drive system sprocket 47 (47
F, 47R).

The rotation shaft of the front and rear drive sprocket 47R on the rear side is extended laterally and a clutch sprocket 52 having a connection / disconnection function is fixed to an end thereof. The chain 5 is interposed between the drive sprocket 53A fixed to the spindle of the front and rear drive gear motor 53 fixed to the rear lower surface.
4 is hung. Thus, the movable base 51 (that is, the turning drive mechanism 50) is driven to move back and forth by the front and rear drive gear motor 53 via the drive chain 48.

The movement drive control is performed by controlling the rotation of the front and rear drive gear motor 53 in the forward and reverse directions by a control device (not shown) and connecting and disconnecting the clutch sprocket 52. Although not shown, a detection signal of a movement amount setting limit switch provided on the guide frame 40 so as to be adjustable in position is input to the control device.
Can be set by operating an operation member provided at the front end.

The turning drive mechanism 50 having the above-described structure is
The rear end side of the position where the motion rod 21 having the air grinder 22 at the front end is supported by the free support mechanism 55,
The tip of the motion rod 21 (i.e., the air grinder 22) is turned by the swinging drive of the eccentric drive mechanism 60 supported by the universal support mechanism 55, and
It is designed to move back and forth along the vertical frame member 41 of the guide frame 40.

The hole inner surface grinding apparatus 10 configured as described above operates as follows to grind the inner surface of the hole 1A to be ground of the work 1.

First, the operation disk 62 of the eccentric drive mechanism 60 is stopped at the eccentric release position, and the eccentric reset air cylinder 56 is driven to set the motion rod 21 in a non-tilted state. The vertical and horizontal positions and the vertical and horizontal angles are adjusted so that the motion rod 21 substantially matches the central axis of the grinding target hole 1A.

Next, the grinding mechanism 20 is advanced, and the grinding wheel 23 of the air grinder 22 provided at the end of the motion rod 21 is inserted into the hole 1A to be ground. The position is set (the inclination angle of the motion rod 21 is set), the eccentric reset air cylinder 56 is retracted, the compressed air is supplied to the air grinder 22, the grinding wheel 23 is rotated, and the eccentric drive mechanism is provided. The motion rod 21 in an inclined state by rotating the turning gear motor 66 of FIG.
The position supported by the eccentric drive mechanism 60 is circularly moved. Thus, the grinding wheel 23 of the air grinder 22 provided at the tip of the motion rod 21 moves (turns) in a circle with a radius corresponding to the inclination angle of the motion rod 21.

Here, the position of the eccentric amount regulating stopper 65 of the eccentric drive mechanism 60 (the inclination angle of the motion rod 21) is determined by the turning diameter of the outer diameter of the grinding wheel 23 and the hole 1A to be ground.
Is set to be larger by a predetermined amount than the diameter of.

As a result, the grinding wheel 23 is placed in the hole 1 to be ground.
The eccentric spring 64 of the eccentric drive mechanism 60 is compressed and deformed because the turning diameter is restricted by contacting the inner peripheral surface of A, and the motion rod 21 is oscillated and urged by its elastic return force, and as a result, the grinding wheel Numeral 23 turns along the inner peripheral surface of the hole 1A to be ground while being pressed against the inner peripheral surface to perform the grinding action.

In this state, the turning drive mechanism 50 is moved forward by the driving of the front-rear drive gear motor 53 to reciprocate a distance corresponding to the depth of the hole 1A to be ground. Thus, the grinding wheel 23 can be completely ground while being pressed against the inner peripheral surface of the grinding target hole 1A with a predetermined pressing force. The reciprocating movement of the turning drive mechanism 50 may be repeated several times as necessary so as to obtain a desired grinding state.

After the grinding of one grinding target hole 1A is completed, the lifting / lowering and swinging movement mechanism 30 is operated to set the grinding mechanism 20 (with the grinding wheel 23) to the next grinding target hole 1A. By performing the process and repeating the process, the grinding target holes 1A of all the works 1 can be ground.

In the above configuration example, the motion rod 21 is oscillated and urged by the elastic return force of the eccentric spring 64 to press the grinding wheel 23 of the air grinder 22 against the inner surface of the hole 1A to be ground. The grinding wheel 23 of the air grinder 22 may be pressed using the elastic deformation (bending) of the motion rod 21 without using the spring 64, and the configuration can be simplified.

In the above configuration example, an air grinder 22 as a rotation driving means is provided at a tip of a motion rod 21 as a shaft member, and the air grinder 22 rotates a grinding wheel 23 as a grinding tool. However, the shaft member (motion rod 21) may be configured to be rotationally driven by the rotational driving means, and a grinding tool may be fixed to the end thereof.

Further, in the above configuration example, the grinding mechanism 20 moves to grind the workpiece 1 in the axial direction (depth direction) of the grinding target hole 1A. May be configured to move with respect to the grinding mechanism 20.

[0054]

As described above, according to the inner surface grinding apparatus of the present invention, the grinding mechanism rotates the grinding tool by the rotation drive means while tilting the shaft member about the free support means as a fulcrum. By pivotally driving the grinding tool by circularly moving the position supported by the pivoting drive means by the pivoting drive means, the inner surface of the hole can be ground by the grinding tool, and the grinding operation of the inner surface of the hole is automatically performed. The burden on the user can be reduced, and a uniform finish can be obtained.

Further, since one of the workpiece and the grinding mechanism is supported so as to be movable substantially in parallel with the extending direction of the shaft member, the grinding tool can be moved in the axial direction with respect to the deep grinding target hole. The inner surface can be ground uniformly by relatively moving (in the depth direction).

In the turning drive means, the elastic urging member presses and biases the rear end of the shaft member to incline, and the urging force of the elastic urging member acts in a direction to increase the turning diameter of the grinding tool. With such a configuration, the grinding tool can be pressed against the inner surface of the hole to be ground by the biasing force of the elastic biasing member to perform quick and stable grinding.

[Brief description of the drawings]

FIG. 1 is a perspective view, viewed from the rear side, showing an entire configuration of a configuration example of a hole inner surface grinding device according to the present invention.

FIG. 2 is a front view of the hole inner surface grinding device.

FIG. 3 is a plan view of the hole inner surface grinding device.

FIG. 4 is a sectional view taken along line AA of FIG. 2;

FIG. 5 is a partial perspective view showing a distal end portion of the pivot rod.

FIG. 6 is a perspective view of the lifting and lowering movement mechanism as viewed from the front side.

FIG. 7 is an enlarged partial cross-sectional view of the turning drive mechanism.

8 is a view as viewed in the direction of the arrow B in FIG. 7;

FIG. 9 is a sectional view taken along the line CC in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Work 1A Hole to be ground 20 Grinding mechanism 21 Motion rod (shaft member) 22 Air grinder (rotation driving means) 23 Grinding grindstone (grinding tool) 55 Free support mechanism (free support means) 60 Eccentric drive mechanism (turn drive means) 64 Eccentric spring (elastic biasing member)

Claims (3)

[Claims] 1. A shaft member having a grinding tool rotatably driven by a rotation driving means at its tip, a universal support means for swingably supporting the shaft member, and a portion of the shaft member supported by the universal support means. A turning drive means for turning the rear end side eccentrically from the center of support by the free support means to turn the shaft member while rotating the grinding tool by the rotary drive means. In a state in which the support means is a fulcrum, the support position of the turning drive means is circularly moved by the turning drive means in a state of being inclined, and the grinding tool is driven to turn to grind the inner surface of the hole of the work. Hole inner surface grinding device. 2. The hole according to claim 1, wherein one of the workpiece and the grinding mechanism is supported so as to be movable substantially in parallel with an extending direction of the shaft member. Internal grinding device. 3. The turning drive means includes an elastic urging member which presses and urges the shaft member to incline the shaft member so that the urging force of the elastic urging member increases the turning diameter of the grinding tool. 2. The method of claim 1, wherein the first and second elements are configured to operate.
Or the inner surface grinding device for holes described in 2.