JP2006035321A - Workpiece cutting method and band mill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a workpiece cutting method and a band mill for cutting a workpiece having a size larger than an interval size between straight line traveling parts of a band saw blade hung around wheels. <P>SOLUTION: The workpiece W is cut with the straight line traveling parts BS1, BS2 between the wheels of the band saw blade BS hung around the wheels 15, 19 provided separately from each other. The straight line traveling parts BS1, BS2 of the band saw blade BS at two places between the wheels are twisted up so as to be located in the same plane. The workpiece W is cut by one twisted-up part BS1 of the band saw blade. The other twisted-up part BS2 of the band saw blade is made to follow one twisted-up part BS1 and enter the inside of a cut groove formed to the workpiece by cutting. The band mill is composed such that the other twisted-up part BS2 follows one twisted-up part BS1 and enters the inside of the cut groove cut to the workpiece by one twisted-up part BS1 of the band saw blade. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a workpiece cutting method and a band saw machine used in the method, and more specifically, to one of the straight grooves of the endless band saw blade opposed to the cutting groove of the workpiece cut on the other straight line. A cutting method in which the traveling part follows and a band saw machine in which a driving wheel unit that rotatably supports a driving wheel around which the band saw blade is wound and a driven wheel unit that rotatably supports a driven wheel are provided. About.

  Conventionally, a band saw machine has a drive wheel rotatably in one saw blade housing provided on one end side of a yoke member, and rotates a driven wheel in the other saw blade housing provided on the other end side of the yoke member. The drive wheel and the driven wheel are provided with an endless band saw blade. When cutting the workpiece, the workpiece is cut by moving the band saw blade so as to be relatively close to the workpiece and performing cutting (for example, Patent Document 1).

There is a prior example that seems to be related to the present invention (for example, Patent Document 2).
Japanese Patent Laid-Open No. 64-20919 Japanese Patent Laid-Open No. 4-289019

  When relatively large workpieces are to be cut, it is generally handled by increasing the diameters of the driving wheel and the driven wheel and increasing the distance between the driving wheel and the driven wheel. . Therefore, the band saw machine had to be large.

  Here, when cutting a workpiece such as a long large plate having a width A = 2000 mm, a height H = 600 mm, and a length L = 8000 mm, a saw blade housing with a driving wheel and a saw blade housing with a driven wheel. And at least 600 mm or more, and the distance between the two saw blade housings is at least 600 mm, and the band saw blade. The distance between the linear running portions must be at least 2000 mm, and there is a problem that the overall configuration becomes large.

  In Patent Document 2, which seems to be related to the present invention, the two linear traveling portions of the band saw blades wound around the drive wheel and the driven wheel are twisted in the same direction, and the two linear traveling portions are used. Therefore, since the workpiece is cut at the same time, for example, it is impossible to cut a workpiece whose height dimension is larger than the distance between the two linear travel parts. There's a problem.

  The present invention has been made in view of the conventional problems as described above, and the invention according to claim 1 is directed to a work with a linear traveling portion between the wheels of a band saw blade wound around wheels provided apart from each other. In the cutting method for cutting the workpiece, the straight running portions of the two band saw blades between the wheels are twisted so as to be located in the same plane, and one twist raising portion of the band saw blade is used to This is a cutting method in which cutting is performed and the other twist raising portion of the band saw blade is made to follow and enter a cutting groove formed in the workpiece by the cutting.

  According to a second aspect of the present invention, in the cutting method according to the first aspect, the one of the band saw blades and the other one of the twist raised parts are cut in the same direction or in the opposite direction. This is a cutting processing method for performing processing.

  According to a third aspect of the present invention, in the cutting method according to the first or second aspect, in the cutting direction of the band saw blade with respect to the workpiece, at least one of when the band saw blade starts to cut into the workpiece or when the band saw blade comes out of the workpiece. This is a cutting method in which the moving speed of the other wheel is controlled to be relatively high or low with respect to the moving speed of one of the wheels.

  According to a fourth aspect of the present invention, in the cutting method according to the third aspect, at the time of cutting near the center of the workpiece at least when the band saw blade starts to cut into the workpiece or when the band saw blade comes out of the workpiece. This is a cutting method in which the cutting speed is controlled to be lower than the cutting speed.

  According to a fifth aspect of the present invention, there is provided a drive wheel unit that is rotatably provided with a drive wheel that is wound with a band saw blade that cuts a workpiece, and a driven wheel unit that is rotatably provided with a driven wheel. Twist raising means for twisting the straight running portion of the band saw blade between the wheel unit and the driven wheel unit is provided on the drive wheel unit side and the driven wheel unit side, and the band saw blade is cut in the cutting direction with respect to the workpiece. Reciprocating drive means for reciprocating the drive wheel unit and the driven wheel unit is provided, and the other twist raising part follows and enters the cutting groove cut into the workpiece by one twist raising part of the band saw blade. As a configuration.

  According to a sixth aspect of the present invention, there is provided a drive wheel in which guide portions provided on a pair of guide frames supported at least on one end side by a support frame are provided in parallel to each other, and are movably supported by the guide portions of one guide frame. A drive wheel is rotatably provided on the unit, a driven wheel unit is rotatably provided on a guide portion of the other guide frame, and an endless band saw blade is hung on the drive wheel and the driven wheel. A reciprocating drive means for reciprocating the drive wheel unit and the driven wheel unit along the guide portion, and a linear traveling portion of a band saw blade between the drive wheel and the driven wheel. Twist raising means for twisting in the reciprocating direction by the reciprocating drive means, the drive wheel unit and Dynamic wheel units provided respectively, in which enters freely configured to follow the other twist-and-raised portions in the cutting groove of the workpiece which has been cut by one of twisting raised portion of the band saw blade.

  The invention according to claim 7 is the band saw according to claim 5 or 6, wherein the first reciprocating drive means for reciprocating the drive wheel unit and the second reciprocating means for reciprocating the driven wheel unit. The reciprocating drive means is provided separately and controllable.

  The invention according to claim 8 is the band saw machine according to claim 7, wherein at least one of the band saw blade in the cutting direction of the band saw blade with respect to the workpiece at the start of cutting of the band saw blade with respect to the workpiece or when the band saw blade comes out of the workpiece. Control means capable of controlling the moving speed of the other wheel unit at least at a high speed or a low speed with respect to the moving speed of the wheel unit is provided.

  The invention according to claim 9 is the band saw according to any one of claims 5 to 8, wherein at least one cutting speed at the start of cutting of the band saw blade with respect to the workpiece or when the band saw blade comes out of the workpiece is set to Control means for controlling the cutting speed to be lower than the cutting speed at the time of cutting near the center portion is provided.

  According to the present invention, the second twist raising portion can follow and freely enter the cutting groove in which the workpiece is cut by the first twist raising portion of the band saw blade. Even if the diameter is small and the distance between the first and second twist raised portions is small, the workpiece can be cut larger than the distance, and the conventional problems as described above. The point can be eliminated.

  Referring to FIG. 1, a band saw machine 1 according to an embodiment of the present invention includes a machine frame 3. The machine frame 3 includes a pair of guide frames 5A and 5B opposed to each other, and both ends of the guide frames 5A and 5B are integrally connected by a pair of support frames 7A and 7B. Is configured as a rectangular frame as a whole. However, the machine casing 3 is not limited to a quadrangular shape, but may be a C-shaped frame.

  In the present embodiment, the guide frames 5A and 5B are spaced apart in the vertical direction and provided horizontally in the left-right direction (left-right direction in FIG. 1), and the lower guide frame 5A functions as a base frame. A support base 6 that supports the workpiece W is provided on the guide frame 5A. The support frames 7A and 7B are spaced apart from each other to the left and right to support both end sides of the upper guide frame 5B. The machine frame 3 can be a C-shaped frame by omitting one support frame 7B and supporting the guide frame 5B in a cantilever manner.

  As described above, when the machine casing 3 has a C-shaped configuration, the three directions of the machine casing 3 are opened, and maintenance and inspection can be performed more easily.

  The guide frames 5A and 5B are respectively provided with guide portions 9A and 9B in the left-right direction in parallel with each other, and the wheel units 11A and 11B are supported by the guide portions 9A and 9B so as to be movable in the left-right direction. ing.

  Of the wheel units 11A and 11B, the lower wheel unit 11A is configured as a drive wheel unit, and the drive wheel 15 is rotatable on a slide member 13A supported by the guide portion 9A so as to be movable in the left-right direction. And a control motor 17 such as a servo motor for rotationally driving the drive wheel 15 is mounted. Moreover, the chip removal apparatus for removing the chip | tip adhering to the band saw blade BS is equipped.

  The upper wheel unit 11B is configured as a driven wheel unit, and a driven wheel 19 is rotatably supported by a slide member 13B supported by the guide portion 9B so as to be movable in the left-right direction. An endless band saw blade BS is wound around the drive wheel 15.

  The slide member 13B in the driven wheel unit 11B is provided with a moving block 21 that is movable in a direction approaching and moving away from the driving wheel unit 11A. The driven wheel 19 is rotatable on the moving block 21. It is supported. The slide member 13B is provided with tension applying means 23 for applying tension to the band saw blade BS.

  More specifically, the tension applying means always urges the moving block 21 so as to move away from the drive wheel unit 11A, such as an elastic member such as a spring or a hydraulic cylinder. It consists of a fluid pressure cylinder or the like. Therefore, the band saw blade BS wound around the drive wheel 15 and the driven wheel 19 is always in a state of being given a tension by the tension applying means 23.

  Twist raising means for twisting the straight traveling portion of the band saw blade BS between the drive wheel 15 and the driven wheel 19 in the moving direction of the drive wheel unit 11A and the driven wheel unit 11B is the drive wheel unit 11A and the driven wheel. It is provided in each wheel unit 11B.

  That is, the saw blade that guides the band saw blade BS by twisting the band saw blade BS on both the left and right sides (both sides in the moving direction) of the facing surface where the drive wheel unit 11A and the driven wheel unit 11B face each other. Guides 25A and 25B: 27A and 27B are provided, respectively.

  In the linear traveling portion of the band saw blade BS, the first linear traveling portion BS1 on the side close to the workpiece W in the normal state is 90 so that the saw teeth are directed in the direction of the workpiece W by the opposed saw blade guides 25A and 27A. ° Twisted to form a first twist raising part. Further, the second straight traveling portion BS2 facing the first straight traveling portion BS1 is twisted 90 ° in the same direction by the facing saw blade guides 25B and 27B to form a second twist raising portion. Yes. The band saw blades BS of the first and second twist raising portions BS1 and BS2 that are twisted by 90 ° in the first and second linear running portions are located in the same vertical plane.

  The drive wheel unit 11A and the driven wheel unit 11B around which the band saw blade BS is wound are moved in the left-right direction (the cutting direction of the band saw blade BS with respect to the workpiece W) along the guide portions 9A and 9B provided in the guide frames 5A and 5B. A reciprocating drive means for reciprocating is provided.

  That is, ball screws 29A and 29B provided in parallel to the guide portions 9A and 9B are rotatably supported on the guide frames 5A and 5B. The ball screws 29A and 29B are respectively connected to the drive wheel unit 11A and the driven wheel. Nut members (not shown) provided on the back surfaces of the slide members 13A and 13B in the unit 11B are screwed together.

  Drive pulleys 33A and 33B rotated by a cutting feed motor 31 attached to the support frame 7A and driven pulleys 35A and 35B (35A not shown) provided at one end of each of the ball screws 29A and 29B are provided. Belts 37A and 37B such as timing belts are wound as power transmission means.

  Therefore, the driving wheel unit 11A and the driven wheel unit 11B are synchronously reciprocated in the left-right direction by appropriately controlling and rotating the cutting feed motor 31 by a control device such as an NC device.

  A chip conveyor 39 for carrying the chips falling when cutting the workpiece W by the band saw blade BS to the outside is arranged below the guide frame 5A, and on the carry-out end side of the chip conveyor 39, A chip box 41 for receiving the chips carried out by the chip conveyor 39 is arranged. In addition, since the structure of the chip conveyor 39 is well-known, detailed description about the chip conveyor 39 is abbreviate | omitted.

  In the configuration as described above, as shown in FIG. 1, the width dimension is larger than the distance dimension between the first and second linear running portions of the band saw blade BS, that is, the first and second twist raising portions BS1 and BS2. After the workpiece W is loaded onto the support base 6 and positioned and fixed, when the control motor 17 is driven to drive the band saw blade BS and the cutting feed motor 31 is rotationally driven, the drive wheel unit 11A and the driven wheel unit 11B are moved. The workpiece W is moved in the direction of the workpiece W, and the cutting of the workpiece W is started by the first twist raising portion BS1 of the band saw blade BS.

  As described above, cutting of the workpiece W is started, and when the cutting of the workpiece W by the first twist raising portion BS1 of the band saw blade BS proceeds, the second twist raising portion BS2 of the band saw blade BS becomes the first twist. It follows into the cutting groove formed in the workpiece W by cutting the raised portion BS1. And the 2nd twist raising part BS2 will lightly recut the cut surface of the workpiece | work W cut | disconnected by 1st twist raising part BS1, and the surface roughness of the cut surface of the workpiece | work W will improve. is there.

  Further, when the workpiece W is cut, the second twist raising portion BS2 of the band saw blade BS is also formed in the cutting groove when the width of the cutting groove tends to be reduced due to the release of the internal stress of the workpiece W. That is, the narrowed portion is cut and the cutting accuracy is improved.

  Further, the connecting portion between the burr and the work W generated on the lower surface of the workpiece W by cutting the first twist raising portion BS1, that is, the portion where the burr is attached to the workpiece W is cut by the second twist raising portion BS2. Thus, the burr can be effectively removed.

  By the way, since the cutting resistance increases when the dimension of the workpiece W is large and the cutting length of the portion to be cut by the band saw blade BS increases, in order to shorten the cutting length and reduce the cutting resistance, It is desirable that the movement with the driven wheel unit 11B is performed alternately and incrementally so that the inclination direction of the first twist raising portion BS1 with respect to the workpiece W is alternately changed.

  Therefore, a clutch is provided in a part of the power transmission path from the cutting feed motor 31 to the ball screws 29A and 29B as an example of the reciprocating drive means, for example, the drive pulleys 33A and 33B or the driven pulleys 35A and 35B, By adopting a configuration in which the two clutches are alternately turned on and off under the control of the control device, the drive wheel unit 11A and the driven wheel unit 11B advance alternately.

  Therefore, the first twist raising portion BS1 of the band saw blade BS cuts the workpiece W by alternately repeating the upper right inclination and the lower right inclination in FIG. Is possible. When the band saw blade BS is inclined as described above, the distance between the drive wheel 15 and the driven wheel 19 changes. Therefore, when the clutches are turned on and off, the distance between the drive wheel 15 and the driven wheel 19 is changed. It is performed while keeping it within an allowable range. Even when the distance between the drive wheel 15 and the driven wheel 19 varies somewhat as described above, the tension is always applied to the band saw blade BS by the tension applying means, and the tension greatly changes. There is always no good cutting.

  As described above, by driving the drive wheel unit 11A and the driven wheel unit 11B alternately, the first twist raising portion BS1 of the band saw blade BS is inclined and cut with respect to the workpiece W. It is something that can be done. Accordingly, the cutting resistance can be reduced by shortening the cutting length at the start of the cutting of the first twist raising portion BS1 with respect to the workpiece W and when the twist raising portion BS1 comes out of the workpiece W.

  Therefore, the bow-like curvature of the first twist raising portion BS1 due to the cutting resistance at the time of cutting the workpiece W can be suppressed to be small, and when the first twist raising portion BS1 comes out of the workpiece W, the bending is caused by elasticity. Abrupt elimination can be suppressed, and generation of large burrs can be prevented. Further, the cutting resistance at the start of cutting can be suppressed to a small level, and the sawtooth chipping and the like in the band saw blade can be suppressed.

  As a method for reducing the cutting resistance at the start of cutting of the first twist raising portion BS1 with respect to the workpiece W and when the first twist raising portion BS1 comes out of the workpiece W, the cutting of the first twist raising portion BS1 with respect to the workpiece W is performed. It is also possible to control the speed to be lower than the cutting speed at the time of cutting near the center of the band saw blade with respect to the workpiece W, that is, in the vicinity of the intermediate portion.

  FIG. 2 shows a second embodiment, and the same reference numerals are given to components having the same functions as those of the above-described first embodiment, and redundant description is omitted.

  In the second embodiment, as a configuration different from the first embodiment described above, the twist raising directions of the first and second twist raising portions BS1 and BS2 in the band saw blade BS are displayed in reverse. However, the twist raising direction of the twist raising portion may be the same direction.

  A configuration greatly different from the first embodiment described above is that separate cutting feed motors 31A and 31B are provided for ball screws 29A and 29B as examples of reciprocating drive means for reciprocating the drive wheel unit 11A and the driven wheel unit 11B. And the cutting feed motors 31A and 31B can be individually controlled by a control device 43 such as an NC device.

  According to the above configuration, the driving wheel unit 11A and the driven wheel are driven in the same manner as in the first embodiment described above by alternately repeating driving and stopping of the cutting feed motors 31A and 31B under the control of the control device 43. The wheel unit 11B can be stepped alternately.

  Further, under the control of the control device 43, the rotational speeds of the cutting feed motors 31A and 31B are individually controlled, so that the moving speeds of the drive wheel unit 11A and the driven wheel unit 11B are alternately increased and decreased. It is controllable and can perform a step similar to the above-described step, that is, a step that repeatedly stops at high speed and low speed, and can achieve the same effect as described above.

  Furthermore, the workpiece W is cut while holding the inclination of the first twist raising portion BS1 of the band saw blade BS with respect to the workpiece W constant for a predetermined time, in other words, the first twist raising portion BS1 with respect to the workpiece W. The cutting angle can be changed every predetermined time to perform cutting. Therefore, it is possible to perform cutting while always keeping the cutting length of the cutting portion of the work W by the first twist raising portion BS1 substantially constant, and the cutting rate (cutting area per unit time) is always properly maintained. All cutting work becomes possible.

  Further, according to the above configuration, the cutting feed motors 31A and 31B can be individually controlled, so that, for example, the driven wheel unit 11B can be repeatedly advanced and stopped with respect to the drive wheel unit 11A. When a work hardened layer is formed during cutting, the moving speed at the time of forward movement can be increased, and the saw blade can be cut deeper than the thickness of the work hardened layer. However, it can be handled.

  FIG. 3 shows a third embodiment, conceptually and schematically showing a configuration in which guide frames 5A and 5B are provided vertically, and having the same function as the configuration of the above-described embodiment. The same reference numerals are given to the portions, and redundant description is omitted.

  The third embodiment is different only in that the workpiece W is cut from above, and can achieve the same effect as the above-described embodiment.

It is action explanatory drawing which showed notionally and schematically the band saw machine which concerns on the 1st Embodiment of this invention. It is operation | movement explanatory drawing which showed the principal part of 2nd Embodiment. It is explanatory drawing which showed notionally and schematically the structure which concerns on 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Band saw machine 3 Machine frame 5A, 5B Guide frame 7A, 7B Support frame 9A, 9B Guide part 11A, 11B Wheel unit 15 Drive wheel 17 Control motor 19 Drive wheel 23 Tension applying means 25A, 25B: 27A, 27B Saw blade guide 31A , 31B Cutting feed motor 43 Controller

Claims (9)

  In a cutting method for cutting a workpiece with a linear traveling portion between the wheels of a band saw blade that is hung on wheels provided apart from each other, the linear traveling portions of the band saw blades at a plurality of locations between the wheels are the same. Cutting is performed so that the workpiece is cut by one twist raising portion of the band saw blade, and the other twist raising portion of the band saw blade is formed on the workpiece by the cutting. A method of cutting a workpiece, characterized in that the workpiece is allowed to follow in the groove.   2. The cutting method according to claim 1, wherein the cutting process is performed with the twisting direction of one twist raising part and the other twist raising part of the band saw blade being the same direction or the opposite direction. Work cutting method.   3. The cutting method according to claim 1 or 2, wherein at least one of the band saw blade in the cutting direction of the band saw blade with respect to the workpiece at the time of starting the cutting of the band saw blade with respect to the workpiece or when the band saw blade comes out of the workpiece. On the other hand, a workpiece cutting method characterized in that the moving speed of the other wheel is controlled to be relatively high or low.   4. The cutting method according to claim 3, wherein at least one of the cutting speed at the time of cutting near the center of the workpiece at the time of starting the cutting of the band saw blade with respect to the workpiece or when the band saw blade is pulled out of the workpiece. A method for cutting a workpiece, characterized in that the method is controlled to a minimum.   A drive wheel unit that is rotatably provided with a drive wheel that rotates a band saw blade that cuts a workpiece and a driven wheel unit that is rotatably provided with a driven wheel are provided separately, and the drive wheel unit and the driven wheel unit Twist raising means for twisting the straight running portion of the band saw blade between the drive wheel unit side and the driven wheel unit side, and the drive wheel unit and the driven wheel unit in the cutting direction of the band saw blade with respect to the workpiece. A reciprocating drive means for reciprocating movement is provided, and the other twist raising part follows and enters the cutting groove cut into the work by one twist raising part of the band saw blade. Band saw machine.   Guide portions provided on a pair of guide frames supported at least on one end side by a support frame are provided in parallel to each other, and a drive wheel is rotatably supported by a drive wheel unit movably supported by the guide portion of one guide frame. A driven wheel unit that is movably supported by a guide portion of the other guide frame, and is provided with an endless band saw blade wound around the drive wheel and the driven wheel. A reciprocating drive means for reciprocating the unit and the driven wheel unit along the guide portion, and a linear traveling portion of a band saw blade between the drive wheel and the driven wheel in a reciprocating direction by the reciprocating drive means. Twist raising means for twisting is provided in the drive wheel unit and the driven wheel unit. Respectively provided, band saw, characterized by being configured to freely enter and follow the other twist-and-raised portions in the cutting groove of the workpiece which has been cut by one of twisting raised portion of the band saw blade.   The band saw machine according to claim 5 or 6, wherein a first reciprocating drive means for reciprocating the drive wheel unit and a second reciprocating drive means for reciprocating the driven wheel unit are controlled separately. Band saw machine characterized by being provided.   The band saw machine according to claim 7, wherein at least one of the band saw blade in the cutting direction of the band saw blade with respect to the workpiece at the time of starting the cutting of the band saw blade with respect to the workpiece or when the band saw blade comes out of the workpiece, A band saw machine comprising control means capable of controlling the moving speed of the other wheel unit at least at a high speed or a low speed.   The band saw machine according to any one of claims 5 to 8, wherein at least one cutting speed at the time of starting the cutting of the band saw blade with respect to the work or when the band saw blade comes out of the work is the cutting at the time of cutting near the center of the work. A band saw machine comprising control means for controlling the cutting speed to be lower than the speed.

Images