JP2016016476A - Vibration-proof device for band saw machine, and band saw machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration-proof device for a band saw machine capable of inhibiting vibration of a band saw blade even when the blade edge of the band saw is consumed, and to provide a band saw machine therewith.SOLUTION: A vibration-proof device for a band saw machine includes first and second rollers holding from both sides, a band saw blade during cutting of a workpiece. The first roller holds the twisted-up band saw blade from a first side face that is the side which receives reaction force from the back part of the blade, and the diameter of a portion holding the blade edge of the band saw is larger than that of the portion holding the back part of the band saw blade. The second roller holds a second side face that is the side opposite to the first side face of the band saw blade. The band saw machine comprising the vibration-proof device therefor is also provided.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vibration isolator that suppresses vibration of a band saw blade that is cutting the workpiece by attaching the band saw blade to an endless band saw blade that travels and cuts the workpiece.

  Conventionally, a band saw machine is used for cutting various works such as wood, stone, metal, and steel. The band saw machine includes an endless band saw blade wound around a pair of wheels. When the wheel is powered and rotated, the band saw blade continuously travels in one direction, and the band saw It is an apparatus that can cut the workpiece that is in contact with the blade edge part of the blade (see, for example, FIG. 1 of cited document 1). In the band saw machine, generally, the wheel rotates vertically, and the band saw blade wound around the wheel loops in a “sleeping state” in which one side surface is supported by the wheel circumferential surface. doing. And it has the structure which can cut | disconnect the workpiece | work fixed below by dropping the loop structure which consists of a pair of said wheel and a band saw blade. Therefore, in order for the lowered band saw blade to cut the workpiece, it is necessary to twist the “slung state” band saw blade “perpendicularly” so that the edge of the band saw blade faces the workpiece side. . As a mechanism for causing the twist, the band saw blade guide device (hereinafter referred to as an insert or the like) called an insert or the like that sandwiches the band saw blade with a block from both sides is provided at the position of the band saw blade before and after contacting the workpiece. Is installed).

  By the way, when the band saw blade is worn out during use of the band saw, vibrations called “billi” occur in the band saw blade. When this vibration becomes significant, the cutting accuracy is lowered with a loud vibration sound, and the cutting rate and the saw speed during cutting must be reduced. As a result, in addition to the time required for cutting the workpiece, early replacement of the band saw blade itself may be necessary. Therefore, as shown in FIG. 4, the band saw machine is provided with a vibration isolator as a tool for suppressing the vibration, usually at the position of the band saw blade closest to the wheel side from the insert or the like. That is, the anti-vibration device is located at the position of the band saw blade before contacting the workpiece, at the position of the band saw blade that is positioned in the front stage of the insert or the like and is being twisted by the insert or the like. Yes. In general, the vibration isolator is also installed at the position of the band saw blade after the contacted band saw blade cuts the workpiece and leaves the workpiece (see FIG. 4 for details). Will be explained later).

  The vibration isolator is an instrument having a pair of rollers (FIG. 3). And with this pair of rollers, the portion of the band saw blade that extends from the "blade edge" to the "back" above the blade edge is sandwiched from both sides, thereby suppressing the vibration of the band saw blade. is there. In the vibration isolator, the first roller 3 positioned on the side receiving the reaction force from the back of the band saw blade 2 and the second roller 4 facing the first roller 3 are adapted to the vertical width of the band saw blade. In general, the axial length (height) is generally in the range of 30 to 70 mm (around 50 mm). And in the case of the vibration isolator 1 of FIG. 3, the said 1st roller 3 is a combination roller divided into 4 equally in the axial direction. Of the combined rollers divided into four equal parts, the lowermost roller is positioned at the height of the cutting edge portion of the band saw blade, and the other rollers are positioned at the height of the back portion. Further, a deep groove ball bearing is used for the rotating shaft of the first roller 3, and a self-aligning bearing is used for the rotating shaft of the second roller 4 facing it. And in order to suppress the said vibration more effectively, the method of enlarging the said roller by enlarging the said roller etc. is proposed (patent document 1, 2).

JP 2010-194652 A JP 2009-220246 A

The vibration isolator according to Patent Documents 1 and 2 is effective in suppressing the vibration of the band saw blade. However, in order to achieve this effect, it is necessary to have enough space to install a “large roller” that can gain the weight of the roller. If the band saw blade is supported by this large roller, it may be necessary to greatly deviate from the position of the axis of the roller itself, and when applied to an existing band saw machine, a drastic and complex improvement is necessary. It was.
An object of the present invention is to provide a vibration isolator for a band saw that can be applied to existing band saws without difficulty.

The present invention is attached to a band saw machine that cuts the workpiece by twisting and raising the endless band saw blade running around a pair of wheels so that the cutting edge portion of the band saw blade faces the workpiece side, In the vibration isolator for suppressing the vibration of the band saw blade while cutting the workpiece,
The vibration isolator includes first and second rollers that sandwich the band saw blade that is cutting the workpiece from both sides,
The first roller holds the twisted band saw blade from a first side that is a side that receives a reaction force from a back portion of the band saw blade, and holds the cutting edge portion of the band saw blade. The diameter of the part to be larger than the diameter of the part holding the back of the band saw blade,
The second roller is a vibration isolator for a band saw machine that holds a second side surface that is a side surface opposite to the first side surface of the band saw blade.

The first roller has an axial length of 30 to 70 mm, and a difference between a diameter of a portion holding the blade tip of the band saw blade and a diameter of a portion holding the back portion of the band saw blade is within 10 mm. It is preferable that Alternatively, in the first roller, the diameter of the portion that holds the cutting edge portion of the band saw blade is larger than the diameter of the portion that holds the back portion of the band saw blade, and the portion that holds the cutting edge portion of the band saw blade And a tangent line connecting the peripheral surface of the portion that holds the back portion of the band saw blade has an inclination of 1.0 ° or more with respect to the axial direction of the first roller. preferable.
It is preferable that the first roller is divided into at least a portion that holds a cutting edge portion of the band saw blade and a portion that holds a back portion of the band saw blade.
The second roller preferably has a rotary shaft formed of a deep groove ball bearing.

  And this invention is the band saw machine provided with the vibration isolator for band saw machines of the said invention.

  According to the present invention, the vibration of the band saw blade can be suppressed without increasing the roller of the vibration isolator or without increasing the weight of the roller. And the basic structure of the vibration isolator which the conventional band saw machine has can be utilized, and the vibration of a band saw blade can be suppressed. Thereby, even if the cutting edge of the band saw blade is consumed, generation of large vibrations during cutting can be suppressed.

It is a figure which shows an example of a structure of the vibration isolator for band saw machines of this invention. It is a figure which shows another example of a structure of the vibration isolator for band saw machines of this invention. It is a figure which shows an example of a structure of the conventional vibration isolator for band saw machines. It is a figure which shows a part of structure of a band saw machine roughly.

  The present invention is characterized in that, in the vibration isolator attached to the conventional band saw, the diameter of the roller (first roller) on the side receiving the reaction force from the back of the band saw blade is the back of the band saw blade. The portion that holds the blade and the portion that holds the blade edge portion are different. Details will be described below.

  In order to effectively suppress the vibration of the band saw blade, the band saw blade that is cutting the workpiece is securely (without play) between the pair of rollers of the vibration isolator before contacting the workpiece. It is effective. Therefore, the present inventor investigated the situation in which the pair of rollers sandwiched both side surfaces of the band saw blade in various cutting situations.

  As shown in FIG. 4, the vibration isolator 1 for a band saw machine usually has a band saw blade 2 traveling toward the work 6 on the upstream side of the insert or the like 5 at the position of the band saw blade before contacting the work. Near the incoming side). When the width of the vise 7 that fixes the workpiece is adjusted to accommodate workpieces of various dimensions, the vibration isolator 1 also moves integrally with the insert 5 following the movement amount. . Therefore, when the dimensions of the workpiece are small, the width of the vice is adjusted to be narrow, and the insert and the vibration isolator move greatly so as to approach the workpiece side. On the other hand, the vibration isolator 1 and the insert 5 are separated from the wheel 8 on the further upstream side. As a result, the force necessary to cause the band saw blade to twist is not so high, the load on the insert or the like is small, and the reaction force that the band saw blade after twisting tries to return to the original state is also small. Therefore, when the workpiece size is small, the band saw blade during cutting can be relatively firmly fixed without improving the roller of the vibration isolator, for example, without increasing the size as in References 1 and 2. The vibration of the band saw blade is not so much of a problem.

  However, when the workpiece size is large, the width of the vise is adjusted widely. And the said vibration isolator, insert, etc. move to the upstream side by the part which the said workpiece | work is large, and approach a wheel. As a result, the force required for twisting the band saw blade increases, the load on the insert or the like is large, and the reaction force that the band saw blade after twisting tries to return to the original also increases. As a result, in the vibration isolator 1 of FIG. 3, a portion of the blade tip portion is provided between the first roller 3 on the side receiving the reaction force from the back portion of the band saw blade 2 and the band saw blade 2. , A gap of about several millimeters (for example, about 1 to 2 mm) is generated. This gap becomes “play” that allows the band saw blade to vibrate during cutting, and the band saw blade vibrates. In this case, if the roller of the vibration isolator is enlarged as in References 1 and 2, the band saw blade being cut can be clamped firmly (perpendicularly), so that vibration of the band saw blade can be effectively suppressed. However, as described above, enlarging the roller involves a large change in the band saw.

  Therefore, the present inventor has studied a technique that can effectively suppress vibration without enlarging the roller of the vibration isolator even when the dimensions of the workpiece are large. As a result, until now, when trying to clamp the band saw blade before coming into contact with the workpiece in a “vertical state” as much as possible even with the vibration isolator, an insert etc. is located in the immediate vicinity of the downstream side. It was found that even if the workpiece is held in an inclined state, the cut surface of the workpiece is good and the bending can be allowed (for example, 1 mm or less), and there is no problem in cutting. Cutting is the bending of the cutting line caused by the “bending” of the band saw blade being cut. Then, under the condition that the band saw blade may be slightly inclined, if the cutting edge of the band saw blade is pushed with the first roller, the “gap” is filled and the circumferential surface of the first roller Reached the side of the band saw blade so that the band saw blade could be clamped firmly.

  That is, the vibration isolator for a band saw machine according to the present invention has a configuration including the first roller 3 and the second roller 4 as shown in FIG. 1, and the band saw blade 2 of the first roller 3. The diameter of the portion that holds the blade tip portion is larger than the diameter of the portion that holds the back portion of the band saw blade. Preferably, the length of the first roller 3 in the axial direction (that is, the total height) is 30 to 70 mm, whereas the diameter of the portion that holds the blade edge portion and the portion that holds the back portion Is 1 mm or more (that is, 0.5 mm or more in radius), more preferably 2 mm or more (1 mm or more). In consideration of the allowable amount that the band saw blade may be slightly inclined, the difference in diameter is preferably within 10 mm (within 5 mm). The axial length of the first roller 3 may be within a range of 40 to 60 mm.

  Or about the 1st roller 3, the tangent which tied the peripheral surface of the part holding the said blade edge | tip part and the peripheral surface of the part holding the said back part which arises with the difference of the said diameter is the axial direction of a roller In contrast, the inclination is preferably 1.0 ° or more, more preferably 2.0 ° or more. In consideration of the allowable amount that the band saw blade may be slightly inclined, the inclination is preferably within 5.0 °. More preferably, it is within 4.0 °.

  The first roller may be manufactured integrally. Alternatively, as shown in FIG. 1, at least a part that holds the blade edge part and a part that holds the back part may be divided and produced, and these rollers may be combined. Moreover, you may further divide | segment the roller of the part holding the said back part like FIG. 1 (it divided into 3 in FIG. 1). By dividing the roller, the reaction force of the band saw blade applied to the entire roller can be distributed to each of the divided rollers, and the load applied to each of the divided rollers can be reduced.

  Various bearings can be applied to the rotating shaft of the first roller. At this time, you may comprise the whole said roller with a bearing. The type of bearing is preferably a deep groove ball bearing that can hold the shaft fixedly. Further, the peripheral surface skin of the roller may be metal skin, for example, the skin of the portion holding the blade edge portion may be various resins such as urethane. In this case, it is possible to use, for example, various resin mold bearings that are less deformed with respect to the reaction force from the band saw blade.

  The second roller does not require any further improvement. And various bearings are applicable also to the rotating shaft of a said 2nd roller similarly to the said 1st roller. You may comprise the whole said roller with a bearing. Alternatively, the whole of the bearing may be covered with another member made of metal, cemented carbide or the like so that the length of the roller in the axial direction is, for example, about 30 to 70 mm, and the whole of the roller may be finished. . The peripheral surface skin of the second roller may be the above-described metal skin or super hard skin, or may be various resins such as urethane. In this case, it is possible to use, for example, various resin mold bearings that are less deformed with respect to the reaction force from the band saw blade.

  Further, as the type of bearing of the second roller, as shown in FIG. 1, a self-aligning bearing having an axis adjusting function can be used. In addition to this, a deep groove ball bearing can also be used as shown in FIG. The deep groove ball bearing is preferable in that the shaft center of the roller can be fixedly held. Then, the vibration of the band saw blade during cutting is generated starting from the cutting edge that is in contact with the workpiece. If the second roller is a deep groove ball bearing that does not have a centering function, the first groove Since the “blade edge” of the band saw blade whose back portion is slightly inclined toward the roller can be preferentially held, it is more effective in suppressing the vibration of the band saw blade. And in the effect of preferentially holding the cutting edge part, the axial length of the second roller is made small, for example, less than 30 mm, and substantially only the cutting edge part of the band saw blade is held. You can also

  According to the vibration isolator for the band saw machine of the present invention, both sides of the band saw blade being cut can be firmly held even when the size of the workpiece is increased and the width of the vice is adjusted to be wide. And since the said band saw blade will be twisted up with the said insert etc., it is not necessary to support the angle of a band saw blade perpendicularly, Therefore The burden to a vibration isolator can also be reduced.

  The vibration isolator for a band saw machine according to the present invention is installed at least at a position upstream of two positions between the insert 5 and the wheel 8 in FIG. Both side surfaces can be firmly held, and vibration of the band saw blade can be suppressed. And it can suppress more reliably the vibration of a band saw blade by installing also in the downstream position.

A JIS standard steel type SKD61 (hardness 20.5 HRC, height 110 mm × width 700 mm × length 170 mm) was prepared for the workpiece, and this was cut with a band saw. In addition, the thing made from high-speed tool steel (high speed) was used for the band saw blade. Here, the band saw blade has been used in advance, and the total cutting area of the workpiece cut so far has reached approximately 50,000 (cm ² ). The band saw blade is worn out as the total cutting area increases. In general, the life of the band saw blade is around the time when the total cutting area reaches 80,000 to 100,000 (cm ² ), and the band saw blade used in this example is in a state where vibration is likely to occur. .

  The distance between the centers of the wheels during cutting is about 2700 mm. The vise width is 700 mm. The vibration isolator was attached to the two positions shown in FIG. Regarding the vibration isolator attached to the band saw machine, the first roller used was a combination of four deep groove ball bearings having the same diameter in the axial direction. At this time, the total length of the first roller in the axial direction was 48 mm. A second roller having an axial length of 55 mm was used. The second roller is a single deep groove ball bearing having an axial length of 7 mm, which is covered with carbide. And about the said 1st roller of the vibration isolator attached upstream, when generation | occurrence | production of a vibration is changed when the diameter of the roller of the lowest stage (namely, the roller holding the blade edge part of a band saw blade) is changed, The maximum cutting rate and saw speed at which cutting was possible were measured. In addition, cutting was also measured. The bending was measured as the amount of deflection near the center of the cutting band saw blade by a bending detection device attached to the band saw machine. The results are shown in Table 1.

  In the case of Condition B where the diameter of the first roller is constant over the entire axial direction, when the band saw blade edge is worn, the saw speed that can be cut while suppressing vibration is limited to 40 m / min. Met. On the other hand, the condition A of the example of the present invention in which the diameter of the first roller is operated so as to satisfy the present invention is that the peripheral surface of the portion that holds the blade tip portion of the band saw blade and the portion that holds the back portion of the band saw blade The tangent line connecting with the peripheral surface of the first roller had an inclination of 2.98 ° with respect to the axial direction of the first roller. And even if the cutting edge of the band saw blade was consumed, the vibration could be suppressed, and as a result, the cutting rate and the saw speed could be greatly increased as compared with the condition B. Moreover, the cutting at the time of a cutting | disconnection was also suppressed to 1 mm or less, and the favorable cutting result was shown.

DESCRIPTION OF SYMBOLS 1 Vibration isolator 2 Band saw blade 3 1st roller 4 2nd roller 5 Insert etc. 6 Work 7 Vise 8 Wheel

Claims (6)

An endless band saw blade that runs around a pair of wheels is twisted and raised so that the cutting edge of the band saw blade faces the workpiece side, and is attached to a band saw machine that cuts the workpiece, cutting the workpiece In the vibration isolator that suppresses the vibration of the band saw blade inside,
The vibration isolator includes first and second rollers that sandwich the band saw blade that is cutting the workpiece from both sides,
The first roller holds the twisted band saw blade from a first side that is a side that receives a reaction force from a back portion of the band saw blade, and holds the cutting edge portion of the band saw blade. The diameter of the part to be larger than the diameter of the part holding the back of the band saw blade,
The vibration isolator for a band saw machine, wherein the second roller holds a second side surface that is a side surface opposite to the first side surface of the band saw blade. The first roller has an axial length of 30 to 70 mm, and a difference between a diameter of a portion holding the blade tip of the band saw blade and a diameter of a portion holding the back portion of the band saw blade is within 10 mm. The vibration isolator for a band saw machine according to claim 1, wherein: The first roller has a diameter of a portion that holds a cutting edge portion of the band saw blade that is larger than a diameter of a portion that holds a back portion of the band saw blade, and a circumference of a portion that holds the cutting edge portion of the band saw blade. The tangent line connecting the surface and the peripheral surface of the portion holding the back portion of the band saw blade has an inclination of 1.0 ° or more with respect to the axial direction of the first roller. The vibration isolator for a band saw machine according to claim 1 or 2. The said 1st roller is divided | segmented into the part which hold | maintains the blade edge | tip part of the said band saw blade at least, and the part which hold | maintains the spine part of the said band saw blade, The one in any one of Claim 1 thru | or 3 characterized by the above-mentioned. The vibration isolator for the band saw machine described. 5. The vibration isolator for a band saw machine according to claim 1, wherein the second roller has a deep groove ball bearing as a rotation shaft. A band saw machine comprising the vibration isolator for a band saw machine according to any one of claims 1 to 5.

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