JP2000176803A - Grinding head in grinding device following surface of work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grinding head in a grinding device capable of accurately positioning the grinding head and constantly pressing the grinding head against a work with constant pressing force even when there is undulation on the surface to be ground of the work such as H-steel. SOLUTION: In a grinding head 3 in a grinding device for grinding the surface to be ground, the grinding head 3 is operated so that the grinding head 3 of the grinding device can abut and back off from the surface of a work by a shifting mechanism 7 which is excellent in the positioning accuracy, and a pneumatic cylinder 72 connected to the shifting mechanism 7. In this case, positioning of the grinding wheel W to the position just close to the surface is allotted to the shifting mechanism 7, and abutting of the grinding wheel W on the surface is allotted to the pneumatic cylinder 72. The work is H-steel, and the grinding wheel W of the grinding head 3 is structured to constantly abut on the ground surface of the H-steel with proper constant pressure to gring the steel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding head in a grinding apparatus for grinding a workpiece while following a surface undulation or the like of a workpiece.

[0002]

2. Description of the Related Art Conventionally, as a grinding device for grinding the surface of a work, as shown in, for example, Japanese Patent Application Laid-Open No. 8-108353, a rectangular frame and a horizontal portion of the rectangular frame from the left and right and the right and left. A total of four grinding heads: upper and lower grinding heads movably provided in the vertical direction, and left and right grinding heads movably provided in the vertical and vertical directions of the frame. The character-shaped frame is made movable on the base in the front-rear direction, and a rotatable disk-shaped grindstone is provided at the tip of each grinding head, and is arranged to penetrate the inside of the square-shaped frame. 2. Description of the Related Art There is known an H-section steel grinding apparatus in which an H-section steel is carried in by a transport mechanism and then each of the grinding heads grinds the front and back surfaces of the H-section steel.

[0003]

When the ground surface of the H-section steel is ground by the above-described conventional H-section steel grinding apparatus, the surface of the H-section steel is generated during the manufacturing stage or during transportation. Then, there are very often undulations, irregularities, dimensional errors, deformations, and the like (hereinafter referred to as undulations). However, it is not permissible for them to be scraped or to leave black scale during the grinding stage.

In the above-described conventional grinding apparatus for H-section steel, in which the grinding wheel of the grinding head is brought into contact with each surface of the H-section steel by the expansion and contraction operation of a hydraulic cylinder, accurate positioning can be performed, but once. After the positioning of the grinding head, the grinding head is kept firmly at that position, which causes inconvenience. That is,
Although an elastic body such as a spring is mounted on the back surface of the grindstone as shown in FIG. 3, since the resilient force of the elastic body fluctuates depending on the amount of pressing, the whetstone or the like causes the grinding stone of the grinding head to be always constant. There was a problem that it was not possible to continue pressing by force, which caused uneven grinding and did not allow good grinding. In addition, there is also a problem that the grinding is not successful because the pressing force varies depending on a slight error in the positioning itself of the grinding head. The same applies to the case where the grinding head is moved and positioned by the screw type moving mechanism.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and accurately positions a grinding head even if the surface of a work has undulations, and always keeps the grinding head at an appropriate constant level with respect to a grinding surface. It is an object of the present invention to provide a grinding head in a grinding apparatus which can press completely with a pressing force and completely grind while following a surface of a work.

[0006]

According to a first aspect of the present invention, there is provided a grinding apparatus for a grinding apparatus which follows a surface of a work,
In a grinding head in a grinding apparatus that grinds a grinding surface of a work while following a surface undulation or the like, the grinding head has a moving mechanism having excellent positioning accuracy and a pneumatic cylinder connected to the moving mechanism. The grindstone of the grinding head is freely contacted and separated from the grinding surface, and the positioning mechanism positions the grindstone to a position immediately adjacent to the grinding surface of the work, and the grinding wheel contacts the grinding surface. It is configured to be carried by the pneumatic cylinder.

According to a second aspect of the present invention, there is provided a grinding head in a grinding apparatus for following a surface of a work, wherein the work is an H-shaped steel, and a grinding wheel of the grinding head is brought into contact with a ground surface of the H-shaped steel. Is to be ground.

Here, as the above-mentioned moving mechanism having excellent positioning accuracy, for example, in addition to a hydraulic cylinder, a screw-type mechanism that performs positioning by rotating a ball screw corresponds.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 schematically shows a grinding apparatus for an H-section steel employing a grinding head in a grinding apparatus for following the surface of a work according to the present invention. First, the configuration of the H-section steel grinding apparatus will be described.

On the floor surface 1 (or on a base provided on the floor surface 1), rails 11 and 12 are provided which extend back and forth at their left and right positions. Along the floor 1 so as to be movable back and forth.

The square frame 2 includes upper and lower horizontal beams 21.
And 22 are connected at right and left ends by vertical pillars 23 and 24, respectively, and are moved back and forth along rails 11 and 12 by a hydraulic cylinder (not shown) or the like.

On the upper horizontal beam portion 21 of the square frame 2, an upper inner surface grinding head 3 and an outer vertical surface grinding head 5 on the right side in FIG. 2 are movably supported in the horizontal and vertical directions. The left vertical pillar portion 24 supports the left outer vertical grinding head 6 movably in the left-right and up-down directions, and the lower horizontal beam portion 22 further holds the lower horizontal beam portion 22. An inner surface grinding head 4 is also movably supported in the left-right and up-down directions.

That is, the upper horizontal rail unit 21
a, two sliders 31 and 51 in total, and one slider 41 is slidably supported on the lower horizontal rail unit 22a, respectively.
A slider 61 is slidably supported by the left vertical rail unit 24a. A vertical rail unit 52 is attached to a vertical support arm 52 suspended from the slider 51.
a, and a slider 53 is slidably supported on the vertical rail unit 52a.

A support arm 32 is supported on the slider 31, and a support arm 42 is supported on the slider 41 so as to be vertically movable. An upper inner surface grinding head 3 is provided at a lower end of the support arm 32 and an upper end of the support arm 42. Are each provided with a lower inner surface grinding head 4.

A support arm 62 is supported on the slider 61 so as to be movable left and right. A left outer grinding head 6 is provided at the right end of the support arm 62.

A support arm 54 is provided integrally with the slider 53, and a right outer grinding head 5 is provided at the left end of the support arm 54.

The above-mentioned inner surface grinding heads 3 and 4 have a total of a state in which the rotation axis of the disc-shaped grinding wheel W is oriented vertically, and a state in which the head is swung 90 degrees to the left and right sides in the horizontal direction. To make one of the three states
A swing mechanism and a fixing mechanism (not shown) are provided.

The disk-shaped grinding wheels W of the grinding heads 3, 4, 5 and 6 are supported by supporting arms 32, 42, 54 and 6 respectively.
The motors 33, 43, 55, and 63 are linked to each other via rotation transmission mechanisms (not shown) provided in the respective components 2, and are rotatable by driving the motors 33, 43, 55, and 63. In particular, the inner surface grinding heads 3 and 4 are configured to be rotatable in a total of three states, that is, the above-described state in which the head is oriented in the vertical direction, and the state in which the head is shaken by 90 ° on both left and right sides and turned in the horizontal direction. I have.

The upper and lower inner surface grinding heads 3 and 4 and the left and right outer surface vertical grinding heads 5 and 6 are used.
Is configured to be movable in the vertical or horizontal direction by each of the moving mechanisms described below, which are the main parts of the present invention, and the grinding heads 3, 4, and 5 and 6 are moved and positioned, and the respective grinding surfaces of the H-section steel are ground by the disk-shaped grinding wheels W of the grinding heads 3, 4, 5 and 6.

The H-section steel is transported in the front-rear direction by a transport mechanism (not shown) arranged to penetrate the inside of the square frame 2 and then fixed.

FIG. 1 is a front view showing the moving mechanism of the upper inner surface grinding head 3 and the right outer surface vertical grinding head 5.

First, the moving mechanism of the upper inner surface grinding head 3 will be described. The inner surface grinding head 3 is vertically moved by the up-down moving mechanism 7, and is moved in the left-right direction by the left-right moving mechanism 8.

The vertical moving mechanism 7 is composed of a hydraulic cylinder 71 as a moving mechanism having excellent positioning accuracy and a pneumatic cylinder 72 having a short stroke. In particular,
The main body of the hydraulic cylinder 71 is provided on the slider 31, and the main body of the pneumatic cylinder 72 is
Are connected via a bracket 32a, and both piston rods 71a, 72a are connected via a connecting member 73. The support arm 32 integrated with the bracket 32 a to which the pneumatic cylinder 72 is connected is supported movably in the vertical direction along a vertical rail unit 34 provided on the slider 31.

The right and left moving mechanism 8 is composed of a hydraulic cylinder 81 as a moving mechanism also having excellent positioning accuracy and a pneumatic cylinder 82 with a short stroke. At the same time, the main body of the pneumatic cylinder 82 is connected to the left side of the slider 31, and both piston rods 81 a and 82 a are connected via a connecting member 83.

When the upper surface of the web (middle plate) of the H-section steel is ground by the inner surface grinding head 3, the rotation axis of the grindstone W of the inner surface grinding head 3 is set in the vertical direction as shown by the solid line. In this state, by extending the hydraulic cylinder 71 and moving the support arm 32 downward, the grindstone W is lowered and positioned to a position immediately near the upper surface of the web portion, after which the pneumatic cylinder 72 is extended to further support the arm. 32 is moved downward, and the grindstone W is brought into contact with the upper surface of the web portion and pressed with a pressing force suitable for grinding.

In this state, the rotating grindstone W is moved back and forth or left and right with respect to the upper surface of the web portion by the forward and backward movement of the square frame 2 or the expansion and contraction operation of the hydraulic cylinder 81, thereby grinding the upper surface of the web portion.

At this time, even if there is undulation or the like in the ground portion, the grinding by the grindstone W can be performed while always maintaining a constant pressing force. That is, the whetstone W follows and adheres closely to the upwardly undulating portion or the downwardly undulating portion, so that the piston in the pneumatic cylinder 72 also slightly moves up and down. However, the compressed air supplied into the pneumatic cylinder 72 is always kept at an appropriate constant pressure by a pressure adjusting valve (not shown), so that the grinding wheel W always presses the grinding portion with a constant force. .

At this time, the disc-shaped grinding wheel W needs to be slightly inclined to follow the undulation of the work.
As shown in FIG.
Since the elastic members such as 0 and 170 are provided, the operation can be performed without any problem. However, in the case of elastic bodies such as springs 150 and 170, even if the inclination of the grinding surface can be appropriately dealt with, the repulsive force of the elastic body changes depending on the level of undulation or the like. The pneumatic cylinder is indispensable because the object of the present invention of pressing against a part cannot be achieved.

Here, the grinding wheel W provided with a spring on the back surface
Will be described with reference to FIG.

Reference numeral 100 in FIG. 3 denotes a holding member provided on each of the grinding heads. The holding member 100 has a disk shape as a whole, and has a female screw 101 for attaching to the rotating shaft 110 at the center thereof. A female screw 102 for screwing a later-described center bolt 120 is coaxially cut. The rotating shaft 110 is a grindstone shaft of each of the above-described grinding heads, and by screwing a male screw 111 formed at an end of the shaft and a female screw 101 of the holding member 100, the holding member 100 is rotated. To the shaft end.

The holding member 100 includes the holding member 100
The outer ring 140 is supported by the plurality of guide bolts 130 inserted through the plurality of through holes 103 formed so as to be able to approach and separate from the holding member 100, and
The separated end is regulated by the contact between the head 131 of the guide bolt 130 and the upper surface of the holding member 100, and the rotation of the holding member 100 is transmitted to the outer ring 140 by the guide bolt 130. The outer ring 130 is urged in a direction away from the holding member 100 by a spring 150 inserted between the outer ring 130 and the holding member 100 as shown in FIG. 1 when no external force is applied. 100 at the remote end.

The inner ring 160 provided coaxially with the outer ring 140 is not directly supported by the holding member 100, but is indirectly approached / separated from the holding member 100 via the outer ring 140. It is freely supported.
That is, the inner ring 160 is disposed so as to be displaceable along the inner peripheral surface of the outer ring 140 in the vertical direction in the drawing, that is, in a direction approaching / separating from the holding member 100, and The collar part is 16
1 formed on the outer ring 1
By contacting the step 141 formed on the inner periphery of the inner ring 40, the separated end of the inner ring 160 from the holding member 100 is regulated. The spring 1 inserted between the inner ring 160 and the holding member 100 is also used.
In a state in which no external force acts on the inner ring 160, the inner ring 160 has its collar portion 161 abutting against the step portion 141 of the outer ring 140 as shown in FIG. It is located in a contact state, that is, at a separated end from the holding member 100.

The rotation of the holding member 100 is transmitted to the inner ring 160 by the center bolt 120.
That is, a substantially rectangular through hole 162 is formed at the center of the inner ring 160. The lower end 121 of the center bolt 120 has a cross-sectional shape substantially equivalent to the contour of the through hole 162, and the center bolt 120 has the lower end 121 inserted into the through hole 162 and the upper end thereof. Is formed in the center of the holding member 100 and is screwed into the screw 102.
The rotation of 0 is also transmitted to the inner ring 160 via the center bolt 120. As shown in FIG. 4, the outer ring 140 and the inner ring 160 have a plurality of segment-shaped grinding wheels W1 concentric with each other on their lower end surfaces.
, W2 are fixed.

With the above-described configuration, even if the surface of the H-section steel is slightly inclined due to undulation, the outer ring 140 and the inner ring 160 follow the holding member 10.
By slightly inclining the through-holes 162, 103 with respect to zero within the range of the play, the surface can be uniformly ground.

Next, when the upper inner surface of the flange (side plate) of the H-section steel is ground by the inner surface grinding head 3, the grindstone W of the inner surface grinding head 3 is set as shown by a two-dot chain line in FIG. The hydraulic cylinder 81 is extended or retracted and the support arm 32 is moved right or left in a state where the rotation axis of the grindstone W is oriented in the horizontal direction by swinging the head 90 ° to the right or left side, thereby moving the grindstone W Is positioned close to the upper right or left inner surface of the flange portion, and thereafter, the pneumatic cylinder 82 is extended or retracted to further move the support arm 32 rightward or leftward. Alternatively, it is brought into contact with the left inner surface and pressed with a pressing force suitable for grinding. As a result, the grinding wheel W can be constantly pressed against the grinding portion by the pneumatic cylinder 82 having the same operation as the above-described pneumatic cylinder 72, and the upper right or left of the flange portion can be irrespective of the presence of undulations. The inner surface can be satisfactorily ground.

Next, the moving mechanism of the right outer vertical grinding head 5 will be described. Outside vertical grinding head 5
The left-right movement is performed by the left-right movement mechanism 9, and the up-down movement is performed by the hydraulic cylinder 10.

The left-right moving mechanism 9 is composed of a hydraulic cylinder 91 as a moving mechanism having excellent positioning accuracy and a pneumatic cylinder 92 having a short stroke. The main body of the hydraulic cylinder 91 is provided on the horizontal beam 21. At the same time, the main body of the pneumatic cylinder 92 is connected to the left side of the slider 51, and both piston rods 91a and 92a are connected via a connecting member 93.

The hydraulic cylinder 10 only performs vertical positioning of the outer vertical grinding head 5,
Since it is not involved in the operation of bringing the grindstone W into contact with the grinding surface, it is provided alone without being connected to the pneumatic cylinder. The main body is provided on the support arm 52, and the piston rod 10a is connected to the slider 53. ing.

When the outer surface of the right side of the flange of the H-section steel is ground by the outer surface grinding head 5, the hydraulic cylinder 10 is expanded and contracted, and the grinding wheel W of the outer surface grinding head 5 is moved up and down. In this state, the hydraulic cylinder 91 is retracted and the support arm 52 is moved to the left while the grindstone W is positioned close to the outer surface on the right side of the flange portion. The cylinder 92 is retracted to further move the support arm 52 to the left, and the grindstone W is brought into contact with the outer surface on the right side of the flange portion to be pressed with a force suitable for grinding. As a result, the grinding wheel W can be constantly pressed against the grinding portion with a constant force by the pneumatic cylinder 92 having the same operation as the above-described pneumatic cylinder 72, so that the grinding of the right outer surface of the flange portion can be performed regardless of the presence of undulations. Can be performed well.

Although not shown, the lower inner grinding head 4 includes a vertical moving mechanism and a left / right moving mechanism having the same configuration as the vertical moving mechanism 7 and the left / right moving mechanism 8 of the upper inner grinding head 3. Is provided. As for the left outer vertical grinding head 6, since the left outer surface of the H-section steel is always at a fixed position as a reference plane, a moving mechanism having excellent positioning accuracy is not required. A moving mechanism and a hydraulic cylinder that performs only vertical movement are provided, and the grinding wheels W of the lower inner surface grinding head 4 and the left outer surface vertical grinding head 6 are always ground with a constant pressing force as described above. It is configured to press against the site.

The operation sequence of the hydraulic cylinder and the pneumatic cylinder that constitute the above-described vertical or left-right moving mechanism is such that the hydraulic cylinder is operated and then the pneumatic cylinder is operated as in the present embodiment. The invention is not limited thereto, and the hydraulic cylinder may be activated after the pneumatic cylinder is activated first, or the hydraulic cylinder and the pneumatic cylinder may be activated simultaneously.

Further, the connection structure between the hydraulic cylinder and the pneumatic cylinder is not limited to the structure in which the piston rods are connected to each other, but may employ an optimum connection structure for both according to the device.

The moving mechanism having excellent positioning accuracy is not limited to the hydraulic cylinder, and various mechanisms such as a screw-type mechanism that performs positioning by rotating a ball screw can be used.

The H-shaped steel grinding apparatus thus constructed operates a left-right or up-and-down moving mechanism or the like in a predetermined procedure by a control device (not shown) so that each grindstone can be applied to each ground surface of the H-shaped steel. By constantly moving W while pressing it with an appropriate force, each of the eight ground surfaces on the front and back of the H-section steel can be ground automatically and efficiently.

Here, the reason that the H-section steel is required to be ground by the H-section steel grinding apparatus is that when the H-section steel is used for, for example, a steel frame of a building, the H-section steel is cut into a predetermined size. It is possible to assemble at a construction site by perforating a predetermined pattern at appropriate positions at both end portions or an intermediate portion thereof, abutting a seam plate provided with the same pattern perforation, and tightening both with bolts. Is H
Since burrs and burrs are generally generated in the drilled part of the section steel due to drilling, they must be removed, and the surface around the drilled part must be ground to maintain a constant coefficient of friction with the seam plate. Because there is.

The surface of the web (middle plate) and flange (side plate) of the H-section steel to be ground is subjected to undulations, irregularities, and the like, which are considered to have occurred during the manufacturing stage and during transportation.
Since dimensional errors and deformations are very often present, the grinding head of the grinding apparatus of the present invention was employed in the above-described H-section steel grinding apparatus. As a result, a good ground surface without grinding unevenness can be obtained by constantly pressing the grindstone W to the ground part with a constant force irrespective of the undulation of the surface of the H-section steel.

In this embodiment, the case where the work is H-shaped steel has been described. However, the work is not limited to the H-shaped steel, and is applicable to any work other than flat steel, square columns, angles, channels, and the like. I can do it.

[0049]

As described above, according to the grinding head in the grinding apparatus of the present invention, the positioning of the grindstone up to the position closest to the surface of the work is performed by the moving mechanism having excellent positioning accuracy, and the grinding surface is moved to the ground surface. The grinding wheel is held in contact with the pneumatic cylinder, so that even if the surface of the work has undulations, irregularities, dimensional errors, deformation, etc. Grinding can be performed by pressing against a grinding portion with an appropriate constant pressure, thereby improving grinding accuracy and preventing occurrence of grinding unevenness.

The grinding head in the grinding apparatus of the present invention is particularly effective when the workpiece is an H-section steel having many undulations on the surface.

[Brief description of the drawings]

FIG. 1 is a front view showing a configuration of a moving mechanism of a grinding head in a grinding device of the present invention.

FIG. 2 is a perspective view showing a schematic configuration of an H-section steel grinding apparatus employing a grinding head in the grinding apparatus of the present invention.

FIG. 3 is a vertical sectional view showing a support structure of a grindstone.

FIG. 4 is a bottom view thereof.

[Explanation of symbols]

 3, 4, 5, 6 Grinding head 7, 8, 9 Moving mechanism 71, 81, 91 Hydraulic cylinder 72, 82, 92 Pneumatic cylinder W Whetstone

Claims (2)

[Claims] 1. A grinding head for a grinding device that grinds a grinding surface of a work while following a waviness of the surface, wherein the grinding head comprises: a moving mechanism having excellent positioning accuracy;
The pneumatic cylinder connected to the moving mechanism allows the grindstone of the grinding head to freely contact and separate from the grinding surface of the work, and positions the grindstone to a position immediately adjacent to the grinding surface of the work. A grinding head for a grinding device that follows the surface of a workpiece, wherein the grinding wheel is configured to bear the grinding wheel on the grinding surface by the pneumatic cylinder. 2. The surface of the work according to claim 1, wherein the work is an H-shaped steel, and a grinding wheel of the grinding head is brought into contact with a ground surface of the H-shaped steel for grinding. Grinding head in the following grinding device.