JPH071318A - Belt sanding machine for metal working - Google Patents

Abstract

PURPOSE:To provide a belt sanding machine for metal working, with which grinding velocity can be increased, the life of a grinding belt can be maintained long, works can be ground into an equal thickness, and even a small work can be ground safely at high velocity. CONSTITUTION:In a belt sanding machine 5 for metal working provided with a carrier means for holding a work 20 consisting of metal plates at a horizontal position and for carrying it in the horizontal direction, and annular grinding belts 9a, 9b which are driven being in contact with at least one surface of the work 20 being carried, magnet chucks 15a, 15b consisting of electromagnets are provided. The magnetic force of the magnet chucks can be adjusted in the close proximity to the rear side of the surface which is in contact with the work 20 of the carrier means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt sander for grinding and removing burrs or barbs produced when a metal plate is melt-cut or cut.

[0002]

2. Description of the Related Art Conventionally, as a method of grinding and removing burrs of a cut metal plate, a method is generally used in which a worker manually grinds and removes it using a portable grinder equipped with an offset type rotary disk grindstone. Has been used.

In the field of woodworking, a wide annular grinding belt made of cloth with abrasive grains adhered thereto is driven around a belt wheel to move a work piece on a belt conveyor and bring it into contact with a rotating grinding belt. Thus, a belt sander that grinds the surface of a workpiece is widely used.

In Japanese Utility Model Laid-Open No. 3-65657, in order to grind the burrs of a fused metal plate using a conventional woodworking belt sander, burrs with a large protruding amount are previously cut by a rotary cutting tool such as a plane milling cutter. A belt sander for metal processing is disclosed, which is removed and then ground with a belt sander.

Further, when grinding a metal plate with a belt sander, in order to increase the cutting speed, a method is used in which the distance between the belt conveyor and the grinding belt is adjusted to increase the pressure of the grinding belt in contact with the workpiece surface. In order to evenly apply pressure to the grinding belt, press the air pad with adjustable internal air pressure against the back surface of the grinding belt running close to the workpiece to press the grinding belt against the workpiece. Something like that is proposed.

[0006]

When the above-mentioned conventional belt sander is used for metal working such as deburring, the grinding metal powder immediately causes clogging of the grinding belt, resulting in a decrease in grinding force. As a result, grinding cannot be performed at a sufficient speed. Further, when removing burrs or the like of the fused metal plate, if the burrs having a protrusion amount of several mm or more are to be ground by the belt sander as they are, the grinding belt will be broken and the life of the grinding belt will be extremely shortened. Therefore, a method of grinding the burrs with a large protruding amount as described above by cutting with a rotary cutting tool in advance and then grinding with a belt sander has been proposed. The damage is large and the life of the grinding belt is shortened.

If the pressing force of the grinding belt is adjusted by adjusting the gap between the belt conveyor and the grinding belt or adjusting the air pad, the grinding speed can be increased to some extent, but when the workpiece becomes smaller, the grinding belt is increased in order to increase the grinding speed. When the pressing force of is increased, the workpiece receives a frictional force in the opposite direction of the front-back direction from above and below due to the gap between the belt conveyor and the grinding belt, and the workpiece tries to roll back and forth. There is a risk of jumping out from the gap between the belt conveyor and the grinding belt, and the sharp corner of the workpiece to be rolled may damage the grinding belt,
This is a major cause of shortening the life of the grinding belt. Further, there is a possibility that the roll that presses the grinding belt from behind may be damaged.

In the conventional belt sander, when the grinding belt is worn and the grinding force is reduced, the gap between the belt conveyor and the grinding belt is shortened to increase the pressing force of the grinding belt and maintain the grinding speed. , In the case of small work pieces, the work piece tries to roll back and forth by the belt conveyor and the grinding belt as described above, especially when the work piece is introduced into the gap between the belt conveyer and the grinding belt or discharged from the gap,
As a result of being strongly tilted back and forth, the front and rear edges of the workpiece are strongly ground by the grinding belt, and the front and rear edges of the workpiece are ground so that they are rounded. Is difficult to finish to a certain thickness.

Therefore, according to the present invention, the grinding speed can be increased, the life of the grinding belt can be kept long, the work can be ground to a uniform thickness, and even a small work can be safely and rapidly ground at a high speed. A belt sander for metal processing is provided.

[0010]

As a result of intensive studies conducted by the present inventors to achieve the above object, a magnet chuck is provided on the back side of a belt conveyor that conveys a workpiece, and its magnetic force can be adjusted. By adjusting the magnetic force according to the size of the work piece so that it has the optimum suction force, the work piece is conveyed while being kept in a completely horizontal state, and the traveling speed of the grinding belt is higher than that of conventional belt sanders. By making it much faster, the grinding speed can be greatly improved without forcibly increasing the pressing force of the grinding belt, there is no danger of the work piece popping out, and the grinding belt is produced by rolling a small work piece. The present invention has been completed by finding that there is no possibility of damage of the above, and that it is possible to safely grind a work much smaller than that which can be processed by the conventional belt sander.

That is, according to the present invention, a workpiece made of a metal plate is held horizontally and is conveyed along the horizontal direction, and an annular grinding belt driven by contacting at least one surface of the workpiece being conveyed. In the belt sander for metal working, the belt sander for metal working is provided with a magnet chuck made of an electromagnet whose magnetic force can be adjusted in proximity to the back side of the surface of the conveying means that contacts the workpiece. And

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the metal working belt sander of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of an example of a belt sander for metal processing of the present invention. Stand 1
An elevating stand 2 is supported on the upper side by four elevating screw jacks 4 driven by an elevating motor 3 so as to be able to move up and down. Belt sanders 5 are mounted on the gantry 1 and the lifting pedestal 2, respectively, and 5a is for lower surface grinding,
5b is for upper surface grinding.

Reference numerals 6a and 6b denote hard rolls rotatably supported by bearings fixed on the pedestal 1 and the elevating pedestal 2, respectively. The surface of the steel roll is thinly coated with hard rubber for slip prevention. Become. Reference numerals 7a and 7b denote soft rolls rotatably supported by bearings mounted on the mount 1 and the lifting mount 2 so that their heights can be adjusted,
As will be described later, it is made of a soft roll having appropriate elasticity, which is formed by densely implanting a non-woven fabric having high rigidity in a radial pattern from the central axis to form a roll. Reference numerals 8a and 8b denote tension rolls mounted to the gantry 1 and the elevating pedestal 2 so as to be able to move up and down, respectively. The grinding belts 9a and 9b are stretched. The hard rolls 6a and 6b are respectively drive motors 10a and 10b.
It is rotationally driven by the chain b via the chain 11, and the grinding belts 9a and 9b stretched over the chain 11 are driven in the arrow direction.

Reference numeral 12 is a supply belt conveyor for placing and supplying a workpiece, 13 is a bottom surface grinding belt conveyor, and 14
Is a belt conveyor for upper surface grinding, which conveys the plate-like workpieces in the horizontal direction. Belt conveyor for bottom surface grinding 1
3 is a magnet chuck 1 between the belts that reciprocally rotate.
5a is provided, and the steel work is magnetically attracted and conveyed from the upper surface. The magnet chuck 15a is composed of an electromagnet, and by adjusting the current flowing through the electromagnet, its magnetic force is adjusted to adjust the attraction force of the workpiece. It is desirable that the belt conveyor 14 for upper surface grinding is also provided with the magnet chuck 15b.

Reference numeral 16 is a baffle plate which prevents the work piece from being carried in due to excessive flash or the like. Reference numeral 17 denotes a dust collecting intake duct that sucks and discharges grinding dust.

As shown in the sectional view of FIG. 2, the soft rolls 7a and 7b have a web of nylon or other synthetic fibers around the central axis 18 of a tubular shape with an adhesive or the like to have a thickness of several mm.
The non-woven fabric 19 having a large rigidity, which is adhered in a sheet shape, is densely laid radially, and the surface has some elasticity. As the non-woven fabric 19 used for the soft rolls 7a and 7b, a well-known non-woven fabric having high rigidity used for ordinary polishing, filtering, or washing can be used. In the present invention, the soft rolls 7a and 7b are not always necessary, and a normal hard roll may be used instead.

The grinding belt used in the belt sander for metal processing of the present invention is not particularly limited, but abrasive grains such as alumina and alumina zirconia are bonded to a strong base cloth made of synthetic fibers with a strong adhesive. A grinding belt that withstands heavy grinding is preferably used.

[0018]

In order to grind and remove the fusing burrs of the steel plate by the metal working belt sander of the present invention, first, the lifting motor 3 is driven to move the lifting platform 2 up and down to adjust the belt sander 5a according to the thickness of the steel plate. The distance between 5b, the upper surface grinding belt conveyor 14 and the lower surface grinding belt conveyor 13 is adjusted.

Then, the exciting current flowing through the electromagnets of the magnet chucks 15a and 15b is adjusted so as to obtain an optimum magnetic attraction force according to the size of the projected shape of the workpiece.
The exciting current is reduced for large workpieces and increased for small workpieces. If the exciting current is increased and the attractive force is increased too much for a large workpiece,
As a result of the belt of the belt conveyor being sandwiched between the magnet chuck 15 and the workpiece 20 and the frictional force between the belt and the magnet chuck 15 becoming too large, the conveyor of the belt conveyor is stopped or the conveyor belt is damaged. Becomes

In the case of a small work 20, the exciting current may be increased to sufficiently increase the attraction force, so that even the small work 20 may roll or jump out of the gap between the belt conveyor and the grinding belt. It is possible to stably convey horizontally while maintaining a horizontal state while receiving a strong grinding action by the grinding belt. In the case of a small work 20, even if strongly attracted by the magnet chuck 15, since the work 20 has a small attraction area, the overall attraction is small and the burden on the belt conveyor is small.

The adjustment of the exciting current of the electromagnets of the magnet chucks 15a and 15b is performed by visually observing the workpiece to be loaded.
The operator may manually adjust the current according to the size, or the size of the work piece may be detected by weight or by an appropriate known method such as an optical method, and the exciting current may be automatically determined. It can also be adjusted.

First, it is placed on the supply belt conveyor 12 with the surface having the large amount of flash attached, which is the back surface during the fusing, facing downward. The workpiece is conveyed by the supply belt conveyor 12 and the lower surface grinding belt conveyor 13, is attracted and fixed to the lower surface of the belt conveyor 13 by the magnet chuck 15a, and the lower surface burr is speeded up by the grinding belt 9a pressed by the hard roll 6a. Is roughly ground and ground, and the lower surface is finished and ground by the grinding belt 9a pressed by the soft roll 7a.

The workpiece whose lower surface has been ground is conveyed by the belt conveyor 14 for upper surface grinding, attracted and fixed thereon by the magnet chuck 15b, and the upper surface is ground by the belt sander 5b. Similar to the grinding of the lower surface, first, it is sandwiched between the hard roll 6b and the belt conveyor 14 for grinding the upper surface, roughly ground at a high speed by the grinding belt 9b, then pressed by the soft roll 7b, and finally ground by the grinding belt 9b.

The driving speed of the grinding belts 9a and 9b is 150.
0-2500 m / min, preferably 1800-2300 m / min
min. By driving the grinding belts 9a and 9b at a higher speed as compared with the conventional belt sander for metal processing, it is possible to completely prevent clogging of the grinding belts 9a and 9b and to obtain a high grinding force. It can be kept for a long time and can be ground at an extremely high speed. Even if a work piece with a large flash is sent in, the magnet chuck 15
The work piece 20 can be securely fixed on the belt conveyor by this, and the burr can be instantaneously ground and removed. The grinding belts 9a and 9b are not broken, and the life of the grinding belts 9a and 9b can be shortened by high speed driving. It can be extended significantly.

In the case of grinding a plate-shaped workpiece with a conventional metal working belt sander, satisfactory grinding cannot be performed unless the workpiece has a diameter of about 200 mm or more. According to processing belt sander, diameter is about 30mm
It is possible to easily grind even a small work piece.

Due to the high speed driving of the grinding belts 9a and 9b and the attraction and fixing of the magnet chuck 15, the workpiece conveying speed is 10 times higher than that of the conventional metal working belt sander.
It can be conveyed and ground at a speed of m / min.

Hard rolls 6a, 6b, soft roll 7a,
Since the distance between 7b and the lower surface grinding belt conveyor 13 or the upper surface grinding belt conveyor 14 is kept constant during operation,
Even if the grinding belts 9a and 9b are driven at a high speed, it is possible to grind and remove only the flash without grinding the workpiece to a certain thickness or less. In the conventional method of pressing the grinding belt against the workpiece with the air pad, the surface of the workpiece may be overcut, but the belt sander for metal processing of the present invention does not overcut the surface of the workpiece.

It is often necessary to grind the fusing burrs of the steel sheet so that the corners are not rounded. In the conventional grinding using a belt sander, the grinding belt is elastically elastic by a contact roll such as a rubber roll. Since the pressed rubber swells laterally in order to press against the work piece, if the pressing force is increased, the corners of the work piece may be shaved round,
Especially for small-sized workpieces, the belt conveyor and the grinding belt apply a frictional force in the opposite direction to the front and back, which may cause the corners to be rounded when tilting forward and backward, and high-speed grinding cannot be performed. With the belt sander for metal processing of the present invention, even if grinding is performed at high speed with high pressing force, the work can be reliably fixed and conveyed on the belt conveyor by the magnet chuck, so even a small work can be machined during grinding. It is possible to prevent the object 20 from tilting back and forth so as not to be ground and round the corners of the workpiece.

The soft rolls 7a, 7 using the nonwoven fabric 19
When b is used, since the non-woven fabric 19 has minute voids inside, it does not bulge laterally like rubber even when a roll made of the non-woven fabric is pressed, and the internal voids absorb the volume compression and work. There is no fear that the corners of the object 20 will be rounded.

Further, when a soft roll made of a non-woven fabric is used in the belt sander for metal processing of the present invention, the density of the non-woven fabric of the soft roll is small, and therefore the grinding belt is 2000 m / min.
Even when driven at a very high speed, there is no fear of vibration such as that of a rubber roll, and the grinding belt can be driven at a high speed.

When it is necessary to grind the entire surface of a plate-shaped work piece, only the burrs at the corners are removed, and scoring lines, markings, printed characters, and figures on the surface of the metal plate are removed. Although it may be necessary to prevent it from disappearing, according to the metal working belt sander of the present invention, the spacing between the grinding belts 9a and 9b and each conveyor belt conveyor is appropriately adjusted by adjusting the elevation of the elevator platform 2. By doing so, it is possible to deal with any case freely.

Although the baffle plate 16 can prevent the work pieces with excessive burrs stuck to them from being carried in, even if the grinding belts 9a and 9b driven at high speed do not easily grind the sticked work pieces such as large burrs. If it is inserted, the grinding belt 9a,
Hard roll 6 to prevent 9b from being damaged
When a large pressure is applied to a and 6b, the hard rolls 6a and 6b can be elastically retracted in order to absorb it, and normally the springs bias the hard rolls 6a and 6b to a predetermined stopper position. Then, the grinding belts 9a and 9b and the belt conveyors 13 and 14 may be kept at a constant distance for grinding.

Prior to grinding with the grinding belt of the metal working belt sander of the present invention, a large flash or the like may be removed by cutting with a cutting tool such as a milling cutter.
The burr of the steel plate fused by the plasma fusing device is hard, and it is difficult to grind with a conventional ordinary belt sander for metal working, but the belt sander for metal working of the present invention can easily grind the plasma fusing burr of a steel plate.

[0034]

According to the belt sander for metalworking of the present invention, the flash of the steel sheet can be removed by grinding at high speed, and the grinding with a milling machine or the like is not required prior to the grinding with the belt sander. Since the work can be securely fixed to the transfer means with the optimum chucking force by the magnetic chuck, there is no fear that the work will roll or jump out during grinding even with a small work, and the work of the grinding belt No damage and extremely long grinding belt life. Since the workpiece is securely fixed on the conveying means in a horizontal state during grinding, there is no fear that the corners of the workpiece are rounded and the entire workpiece can be easily finished to have a uniform thickness dimension.

[Brief description of drawings]

FIG. 1 is a front view of an example of a metal working belt sander of the present invention.

FIG. 2 is a cross-sectional view of an example of a soft roll of the metal working belt sander of the present invention.

[Explanation of symbols]

 1 Stand 2 Lifting Stand 3 Lifting Motor 4 Lifting Screw Jack 5 Belt Sander 6a, 6b Hard Roll 7a, 7b Soft Roll 8a, 8b Tension Roll 9a, 9b Grinding Belt 10a, 10b Drive Motor 11 Chain 12 Supply Belt Conveyor 13 Belt conveyor for lower surface grinding 14 Belt conveyor for upper surface grinding 15a, 15b Magnet chuck 16 Baffle plate 17 Intake duct for dust collection 18 Center axis 19 Nonwoven fabric 20 Workpiece

[Procedure amendment]

[Submission date] September 2, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

In the case of grinding a plate-shaped workpiece with a conventional metal working belt sander, satisfactory grinding cannot be performed unless the workpiece has a diameter of about 200 mm or more.
According to the belt sander for metal processing of the present invention, the diameter is about 30.
Even a workpiece with a size of about mm can be easily ground.

Claims (3)

[Claims] 1. A carrying means for holding a work made of a metal plate horizontally and carrying it along the horizontal direction, and an annular grinding belt driven in contact with at least one surface of the work being carried. A belt sander for metal working, comprising a magnet chuck made of an electromagnet whose magnetic force can be adjusted in proximity to the back side of the surface of the conveying means that contacts the workpiece. 2. The belt sander for metalworking according to claim 1, wherein said conveying means is a belt conveyor. 3. The metal working according to claim 1, wherein the contact roll for pressing the grinding belt against the workpiece from the back side is a soft roll formed by densely implanting a non-woven fabric having high radial rigidity around the central axis. Belt sander.