Band sawing machine and workpiece cutting method using a band sawing machine

Abstract

A band saw machine (91) includes a first wheel (31) that applies tension to a band saw blade (5) to track the band saw blade (5), a second wheel (32) disposed below the first wheel (31), a first supply portion (71) disposed between a lowermost end (P6) of the second wheel (32) traveling toward the first wheel (31) from the second wheel (32) in a rotational travel path of the band saw blade (5) to a workpiece cutting position (P1) to spray a cutting fluid (L) of mist (L1) to a tooth portion (5b) of the band saw blade (5) or to drip the cutting fluid (L), and a second supply portion (72) disposed between the workpiece cutting position (P1) and the second wheel (32) to spray or spray the cutting fluid (L) or a cooling fluid to the band saw blade (5).

Description

Band saw and workpiece cutting methods using band saw Technical Field

[0001] This invention relates to band saws, a method for cooling band saw blades, and a method for cutting workpieces using band saws. Background Technology

[0002] As for methods of supplying cutting oil in cutting processes, the wet method, which supplies cutting oil to the cutting tool in an ample manner, and the MQL (Minimum Quantity Lubrication) method, as described in Patent Document 1, which supplies cutting oil to the cutting tool in a mist manner to minimize the amount used. The MQL method is also known as the semi-dry method or the mist method.

[0003] Patent document 2 describes a cutting device that performs cutting using a band saw blade in a semi-dry manner.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2011-025384

[0007] Patent Document 2: Japanese Patent Application Publication No. 2004-283938 Summary of the Invention

[0008] Semi-dry cutting methods use very little cutting oil, resulting in products with almost no cutting oil adhering to them during band saw cutting. Therefore, post-processing time such as product cleaning is reduced, and the working environment can be maintained in a low-oil-contamination state. Semi-dry or mist methods refer to the method of covering the workpiece with dry mist, which involves spraying cutting oil, forming fine particles in a mist or haze, onto the workpiece.

[0009] On the other hand, the cutting oil supplied to the band saw blade during the cutting process is also the cutting lubricant and the coolant used to cool the material being cut and the band saw blade.

[0010] In semi-dry cutting, the amount of cutting oil used as coolant is less than in wet cutting, resulting in lower cooling efficiency. Therefore, cutting in semi-dry conditions requires controlling the cutting speed to prevent excessive temperature rise in the band saw blade and thus shorten its lifespan. Therefore, research is needed to improve processing efficiency by enabling higher cutting speeds in semi-dry cutting.

[0011] According to one aspect of the present invention, a band saw capable of higher-speed cutting in a semi-dry manner, a band saw blade cooling method, and a workpiece cutting method using the band saw can be provided.

[0012] Methods for solving problems

[0013] One aspect of the present invention has the following structure and steps.

[0014] 1) A band saw, characterized in that it comprises: a first wheel and a second wheel, the first wheel applying tension to the band saw blade for proper tracking, the second wheel being disposed below the first wheel; a first supply unit disposed in the rotational travel path of the band saw blade between the lower end of the second wheel traveling from the second wheel toward the first wheel and to the workpiece cutting position, wherein cutting fluid, in the form of a mist, is sprayed onto the teeth of the band saw blade or dripped onto the cutting fluid; and a second supply unit disposed between the workpiece cutting position and the second wheel, wherein cutting fluid or cooling fluid is sprayed or jetted onto the band saw blade.

[0015] 2) The band saw according to 1) is characterized in that it includes a removal section, which is disposed in the section of the band saw blade from the contact end of the second wheel to the contact beginning of the first wheel in the rotational travel path of the band saw blade, and is disposed between the contact end of the second wheel and the first supply section, to remove the adhering material attached to the band saw blade.

[0016] 3) The band saw according to 2), characterized in that the removal section causes the scraper to slide relative to the surface of the traveling band saw blade, or removes the deposit by spraying gas without cutting fluid.

[0017] 4) A method for cooling a band saw blade, the band saw blade being correctly tracked by tension applied by a first wheel and a second wheel disposed below the first wheel, characterized in that, in the rotational travel path of the band saw blade from the lower end of the second wheel traveling towards the first wheel to the workpiece cutting position, a mist of cutting fluid is sprayed onto the teeth of the band saw blade to cool the band saw blade, and in the distance from the workpiece cutting position to the second wheel, cutting fluid or a gas without cutting fluid is sprayed onto the band saw blade to cool the band saw blade.

[0018] 5) A workpiece cutting method using a band saw, the band saw comprising a first wheel for applying tension to a band saw blade for accurate tracking and a second wheel disposed below the first wheel, characterized in that, in a first supply section between the lower end of the second wheel traveling from the second wheel toward the first wheel in the rotational travel path of the band saw blade and the workpiece cutting position, cutting fluid, in the form of a mist, is sprayed onto the teeth of the band saw blade or dripped onto the band saw blade to cool the band saw blade; in a second supply section between the workpiece cutting position and the second wheel, cutting fluid or a cooling fluid is sprayed or jetted onto the band saw blade to cool the band saw blade; and a scraper disposed in the interval from the contact end of the second wheel to the contact beginning of the first wheel and from the contact end of the second wheel to the first supply section removes adhering material from the band saw blade.

[0019] According to one aspect of the present invention, the following effects can be achieved: the band saw blade can be sufficiently cooled and higher-speed cutting can be performed in a semi-dry manner. Attached Figure Description

[0020] Figure 1 is a schematic perspective view showing the state of the band saw 91 before cutting according to an embodiment of the present invention.

[0021] Figure 2 is a schematic perspective view showing the state of the band saw 91 immediately after it has completed the cutting process.

[0022] Figure 3 is a perspective view showing the first supply unit 71 of the band saw 91.

[0023] Figure 4 is a perspective view showing the second supply unit 72 of the band saw 91.

[0024] Figure 5 is a perspective view showing the removal section 73 of the band saw 91.

[0025] Figure 6 is a schematic diagram illustrating the configuration of the cutting oil treatment unit 7 of the band saw 91.

[0026] Figure 7 is a perspective view of a modified example of the removal part 73, specifically the removal part 73A. Detailed Implementation

[0027] Figures 1 and 2 are perspective views of the band saw 91 according to an embodiment of the present invention. Figure 1 shows the state before cutting the workpiece W, and Figure 2 shows the state immediately after cutting the workpiece W. In Figures 1 and 2, the directions of front-back, left-right, up-down, and back-forward are defined as indicated by the arrows. The directions of front-back, left-right, and back-forward are defined for ease of explanation and do not limit the posture of the band saw. The up-down direction corresponds to the direction of gravity (up-down direction) in the normal setting posture of the band saw 91.

[0028] As shown in Figure 1, the band saw 91 is a fixed vertical type that cuts workpiece W by twisting the band saw blade 5 in a way that allows it to cut long strips of material. The band saw 91 includes a main body 1, a base support 2, a cutting base 3, a workpiece support 6, and a cutting oil treatment unit 7.

[0029] The main body 1 is the base of the band saw 91, and has an integral support base 2 and workpiece support 6 and a control unit 8 that controls the movement of the slide 63, product box 64, box 65 and band saw 91.

[0030] The base support 2 is a part that has a drive unit (not shown) and is erected relative to the workpiece support 6. The base support 2 causes the cutting base 3 to move relative to the workpiece support 6 or the workpiece W in the back-and-forth direction by the operation of the drive unit.

[0031] The cutting base 3 has a first wheel, namely the upper wheel 31, and a second wheel, namely the lower wheel 32, which are separately configured in the vertical direction. For example, the upper wheel 31 is the driving wheel, and the lower wheel 32 is the driven wheel.

[0032] The axis of the lower wheel 32 is parallel to the axis CL31 of the upper wheel 31. The axis CL31 is set to be horizontal and inclined at an angle θa to the right relative to the front and rear directions.

[0033] The band saw blade 5 is properly tracked by adjusting the tension applied in the upper wheel 31 and the lower wheel 32. For example, the band saw blade 5 is properly tracked by adjusting the axial position of the upper wheel 31 relative to the lower wheel 32. The band saw blade 5 has a strip-shaped body portion 5a and teeth 5b formed on one edge of the body portion 5a. The forward orientation of the teeth 5b is tracked and adjusted by the upper wheel 31 and the lower wheel 32.

[0034] The cut-off base 3 has a wheel drive unit 35 that rotates the drive wheel, i.e., the upper wheel 31, in a predetermined direction. In Figure 1, the upper wheel 31 rotates about the axis CL31 in a counterclockwise direction as indicated by arrow DR1 in Figure 1 by the action of the wheel drive unit 35.

[0035] Thus, the upper wheel 31 and the lower wheel 32 can track the state of the band saw blade 5. In the pair of parts of the band saw blade 5 extending between the upper wheel 31 and the lower wheel 32, the left path 5L on the left side moves downward as the first path, and the right path 5R on the right side moves upward as the second path.

[0036] The cutting base 3 has a pair of twisting sections 33 and 34 erected in such a way that they twist toward a portion of the left path 5L traveling downwards on the band saw blade 5. Each of the twisting sections 33 and 34 has a twisting roller (not shown). Through these twisting sections 33 and 34, the teeth 5b of the band saw blade 5 are directed toward the workpiece W.

[0037] Specifically, the band saw blade 5 is fed downward from the upper wheel 31 on the left path 5L with its surface inclined at an angle θa relative to the front-rear direction. Then, the band saw blade 5 is forcibly twisted by an angle θa in the direction of the front-rear direction by the twisting roller of the twisting section 33, and is twisted by an angle θa by the twisting roller of the twisting section 34. The angle θa is 90° or less, for example, 45°.

[0038] The workpiece W is cut by the band saw blade 5, which twists in a manner extending in the front-back direction between the twisting section 33 and the twisting section 34. Therefore, the cut surface of the workpiece W becomes a surface orthogonal to the length direction of the workpiece W.

[0039] The cutting base 3 moves in the front-to-back direction between the standby position shown in FIG1 and the processing end position shown in FIG2 by the action of the drive part of the base support part 2.

[0040] The workpiece support 6 includes a workpiece vise 61 and a product vise 62. The workpiece vise 61 clamps and holds the workpiece W, such as a bar, supplied to the band saw 91 in a forward-backward direction, extending from the left side to the right. The product vise 62 is positioned on the moving path 5L of the left side of the band saw blade 5 during the forward-backward movement of the cutting base 3, clamping and holding the workpiece W in a manner that spans the cutting position from left to right.

[0041] A slit 62b extending in the front-to-back direction is formed in the vise 62a on the rear side of the product vise 62. The left path 5L of the band saw blade 5 moves within the slit 62b during the cutting process.

[0042] The basic actions in the cutting process of band saw 91 are as follows. The workpiece W is a long round bar.

[0043] First, as shown in Figure 1, the workpiece W is positioned so that the cutting position corresponds to the length of the product using the workpiece vise 61 and the product vise 62.

[0044] Next, the wheel drive unit 35 is activated to rotate and move the band saw blade 5. Additionally, the cutting base 3 is moved forward toward the cutting completion position shown in Figure 2.

[0045] The left path 5L of the band saw blade 5 moves within the slit 62b of the vise 62a, cutting and separating the workpiece W held in a left-right extending posture from the rear end side of the cutting position, as shown in Figure 2.

[0046] Product W2 is held by the open product vise 62, and thus falls naturally into the slide 63 located below due to its own weight.

[0047] The slide 63 is arranged at an angle to the lower right, and a product box 64 is placed below the right end. As a result, the product W2 that falls into the slide 63 slides down the slide 63 and falls into the product box 64 from the right end to be collected.

[0048] The cutting oil treatment unit 7 includes at least a first supply unit 71 and a second supply unit 72. The cutting oil treatment unit 7 of the band saw 91 shown in Figures 1 and 2 also includes a removal unit 73.

[0049] The housing 65 includes: a receiving section 652 that receives the cutting fluid, i.e., cutting oil L, supplied to the band saw blade 5; a recovery section 651 that recovers the cutting oil L used for lubrication during machining and cooling of the band saw blade 5, as well as the chips generated during machining; and a delivery pump 653 that delivers the cutting oil L contained in the receiving section 652 to the first supply section 71 and the second supply section 72. However, cutting oil L or gas not containing cutting oil may also be supplied to the first supply section 71 and the second supply section 72 from a supply source different from the delivery pump 653, or gas not containing cutting oil may be supplied to the removal section 73. In addition, a liquid such as coolant may be supplied to the second supply section 72 as a cooling fluid instead of gas not containing cutting oil.

[0050] Furthermore, the second supply unit 72 is primarily designed to supply cutting oil L to the tooth tips of the band saw blade 5's teeth 5b to a degree that does not wet the workpiece W, and is also primarily designed to cool the teeth 5b and body 5a of the band saw blade 5. Therefore, the aforementioned fluids, including cutting fluid and gas, contribute differently to the band saw blade 5, and the designer can select these fluids according to this intention.

[0051] Referring to Figures 1 and 3-5, the cutting oil treatment unit 7 will be described in detail.

[0052] Figure 3 is an enlarged perspective view of the first supply section 71 and its surrounding area in Figure 1. Figure 4 is an enlarged perspective view of the second supply section 72 and its surrounding area in Figure 1. Figure 5 is an enlarged perspective view of the removal section 73 and its surrounding area in Figure 1.

[0053] As shown in Figures 1 and 3, the first supply unit 71 is mounted on the side of the cutting base 3 in a manner that allows it to move together with the cutting base 3. The first supply unit 71 is configured corresponding to the range (interval) between the upper wheel 31 and the workpiece cutting position, i.e., the cutting position P1, in the left path 5L of the band saw blade 5. The workpiece cutting position P1 is also the workpiece cutting position.

[0054] Alternatively, the first supply unit 71 can also be configured from the bottom end P6 of the lower wheel 32 along the travel direction of the band saw blade 5 to correspond to the range (interval) between the workpiece cutting position, i.e., the cutting position P1.

[0055] The first supply unit 71 sprays cutting oil L as a mist L1 onto the band saw blade 5 for lubrication and cooling. The cutting oil L can be either a non-water-soluble cutting oil or a water-soluble cutting oil. Alternatively, the first supply unit 71 may supply the cutting oil L as a mist L1 to the tooth tips of the teeth 5b of the band saw blade 5, or supply the cutting fluid by dripping it onto the tooth tips. The amount of cutting oil L or cutting fluid supplied by the first supply unit 71 to the tooth tips is sufficient for semi-dry cutting, enough to wet the tooth tips as a lubricant, and is only a very small amount compared to wet cutting.

[0056] In detail, the first supply unit 71 has a nozzle 71a from which cutting oil L supplied by the delivery pump 653 is sprayed as mist L1. The nozzle 71a is arranged close to and opposite the front of the teeth 5b of the band saw blade 5. The mist L1 sprayed from the nozzle 71a mainly adheres to the teeth 5b of the band saw blade 5.

[0057] The amount of cutting oil L adhering to the tooth 5b by the mist spray from the first supply unit 71 is pre-adjusted to a degree that enables the workpiece W to be cut well and leaves no substantial residue of cutting oil L on the processed product W2.

[0058] In this way, the band saw blade 5 cuts the workpiece W with a small amount of cutting oil L adhering to its teeth 5b due to the mist L1 from the first supply unit 71. That is, a semi-dry cutting process is performed.

[0059] As shown in Figures 1 and 4, the second supply unit 72 is mounted on the side of the cutting base 3 in a manner that allows it to move together with the cutting base 3. The second supply unit 72 is configured corresponding to the area between the cutting position P1 and the lower wheel 32 in the left path 5L of the band saw blade 5. The second supply unit 72 sprays cutting oil L as a fluid flow L2 onto the band saw blade 5.

[0060] In detail, the second supply unit 72 is formed as a tube, for example, with a discharge port 72a at the front end. The discharge port 72a is arranged close to and opposite the front of the teeth 5b of the band saw blade 5. The second supply unit 72 sprays the cutting oil L supplied from the delivery pump 653 from the discharge port 72a as a liquid stream L2 at a temperature lower than or equal to room temperature, rather than a mist, and sprays it onto the band saw blade 5 in a manner that covers the entire width direction.

[0061] The flow rate and velocity of the liquid stream L2 injected into the tooth section 5b are pre-adjusted to achieve adequate cooling of the band saw blade 5, which is heated by the cutting process, and sufficient removal and cooling of the chips that adhere to the body section 5a and tooth section 5b of the band saw blade 5 generated during the cutting process.

[0062] Thus, the band saw blade 5, which heats up during cutting of the workpiece W, is effectively cooled by the sprayed liquid stream L2. Furthermore, chips and other adhering material on the body 5a and teeth 5b of the band saw blade 5 are removed from the band saw blade 5 while being cooled by the sprayed liquid stream L2.

[0063] The liquid stream L2 sprayed onto the band saw blade 5 and the attached material that detaches from the band saw blade 5 fall downwards and are collected in the recovery section 651 of the box section 65.

[0064] As shown in Figure 5, after the band saw blade 5 passes the second supply section 72 in the left path 5L, it travels upward on the right path 5R via the lower wheel 32.

[0065] The removal unit 73 is mounted on the side of the cutting base 3 in a manner that allows it to move together with the cutting base 3. The removal unit 73 is disposed in the right path 5R, in the interval between the contact end P4 of the lower wheel 32 and the contact beginning P5 of the upper wheel 31.

[0066] The removal section 73 has a pair of scrapers 73a that contact both sides of the body portion 5a of the band saw blade 5. The scrapers 73a are made of soft rubber or the like and slide relative to each other while applying slight force to the surface of the body portion 5a of the traveling band saw blade 5.

[0067] By sliding the scraper 73a relative to the main body 5a, the residual portion of the liquid stream L2 sprayed from the second supply section 72, as well as the adhering substances that were not completely removed from the liquid stream L2 and remain on the surface of the main body 5a, are effectively removed from the surface of the main body 5a by the friction of the scraper 73a. The removed cutting oil L and adhering substances fall downwards and are collected in the recovery section 651.

[0068] The removal unit 73 can also replace the scraper 73a by spraying gas that does not contain cutting oil to blow away the cutting oil L and the adhering substances.

[0069] In the right path 5R, even if there is residual cutting oil L on the band saw blade 5 after passing through the removal section 73, the components that evaporate due to the relative airflow accompanying the movement are fully evaporated. Therefore, the band saw blade 5 enters the left path 5L in a surface-dry state.

[0070] Therefore, in the subsequent first supply unit 71, during the semi-dry cutting process performed by spraying mist L1 onto the toothed part 5b, the liquid flow L2 sprayed by the second supply unit 72 has no effect.

[0071] As described above, the band saw 91 has a second supply section 72, which allows for immediate and effective cooling of the band saw blade 5 after semi-dry cutting.

[0072] Therefore, the band saw 91 can achieve the following two advantages: the cutting oil hardly adheres to the product obtained by semi-dry cutting, and the cutting speed of the band saw blade 5 can be increased, thereby improving the processing efficiency.

[0073] Figure 6 is a schematic diagram showing the travel path of the band saw blade 5 of the band saw machine 91 and the arrangement of the cutting oil treatment unit 7. Hereinafter, the arrangement of the cutting oil treatment unit 7, namely the first supply unit 71, the second supply unit 72, and the removal unit 73, will be described in detail with reference to Figure 6.

[0074] In Figure 6, the upper wheel 31 and lower wheel 32, on which the band saw blade 5 is mounted, are shown with their respective axes CL31 and CL32 orthogonal to the paper. In addition, for ease of understanding and depiction, the band saw blade 5 is shown in a state where it is twisted 90° between the twisting parts 33 and 34.

[0075] In the cutting process, the position where the band saw blade 5 initially contacts the workpiece W (round bar) on its rotational travel path is designated as the workpiece cutting position P1. Hereinafter, the workpiece cutting position P1 will be simply referred to as the cutting position P1. The cutting position P1 is located in the middle of the left path 5L, which serves as the first path. The band saw blade 5 rotates in a counter-clockwise direction, as indicated by arrow DR2 in Figure 6, driven by the wheel drive unit 35.

[0076] Under the control of the control unit 8, the delivery pump 653 supplies the cutting oil L contained in the housing 652 to the first supply unit 71 and the second supply unit 72.

[0077] The first supply unit 71 is located in the travel path of the band saw blade 5, within the range AR1 between position P2, near the lower end of the torsion section 33 of the upper wheel 31, and the cutting position P1. The first supply unit 71 sprays cutting oil L supplied by the delivery pump 653 as mist L1 onto the tooth section 5b.

[0078] Preferably, the first supply section 71 in range AR1 is positioned close to the cutting position P1 so that the cutting oil L adhering to the tooth 5b is used for cutting operations while minimizing the amount of oil that may fly away as the process continues.

[0079] The second supply unit 72 is disposed in the range AR2 between the cutting position P1 and the position P3 where the body part 5a contacts the lower wheel 32 on the left path 5L of the band saw blade 5's travel path. The second supply unit 72 sprays the cutting oil L supplied by the delivery pump 653 as a liquid flow L2 across the entire width of the band saw blade 5, including the body part 5a and the teeth 5b.

[0080] If the position of the second supply section 72 in range AR2 is on the lower wheel 32 side below the torsion section 33, the fluid flow L2 will not hang on the torsion section 33, thus cooling the band saw blade 5 better and removing the attached material.

[0081] The removal unit 73 is provided corresponding to the right path 5R of the band saw blade 5. Specifically, the removal unit 73 is disposed in the range AR3 (interval AR3) between the position P4 (contact end P4) away from the lower wheel 32 of the main body 5a and the position P5 (contact beginning P5) where the main body 5a contacts the upper wheel 31.

[0082] When the lower wheel 32 is set as the upstream position of the reference and the band saw blade 5 travels from upstream to downstream, the removal unit 73 only needs to be located on the upstream side of the supply unit 71 (on the side of the lower wheel 32 in the travel path).

[0083] If the removal section 73 is positioned close to the lower wheel 32, the band saw blade 5 moves to position P5 while the cutting oil L adhering to its surface is largely scraped off by the removal section 73, thus exposing itself to the relative airflow over a longer distance. This further promotes the evaporation of the evaporating components in the cutting oil L adhering to the surface of the band saw blade 5.

[0084] On the other hand, when the removal section 73 is positioned close to the upper wheel 31, most of the cutting oil L adhering to the surface of the band saw blade 5 falls off due to its own weight during its long journey from position P4 to the removal section 73, resulting in less cutting oil L reaching the removal section 73. Therefore, the cutting oil L can be effectively removed in the removal section 73.

[0085] The faster the travel speed, which is proportional to the cutting speed, the more it promotes the drying of the surface of the band saw blade 5 as it travels along the right-hand path 5R. Therefore, under cutting conditions, the faster the travel speed of the band saw blade 5, the closer the removal section 73 should be positioned to the upper wheel 31.

[0086] The position of the removal section 73 in range AR3 is set to the optimal position so that the band saw blade 5 is in a state of sufficient surface dryness when it reaches the next first supply section 71, based on the type of cutting oil L sprayed onto the band saw blade 5 by the second supply section 72, the amount of fluid flow L2, the ring length of the band saw blade 5, and the travel speed of the band saw blade 5.

[0087] Based on these conditions, even without the removal section 73, the surface of the band saw blade 5 is sufficiently dry upon reaching the first supply section 71. That is, the cutting oil treatment section 7 may not have a removal section 73, as long as it has at least a first supply section 71 and a second supply section 72.

[0088] The embodiments of the present invention are not limited to the structure of the band saw 91, the cooling method of the band saw blade 5, and the steps of the workpiece cutting method described above, and may also be modified within the scope of the present invention.

[0089] The coolant flow L2 injected from the second supply unit 72 into the band saw blade 5 is not limited to room temperature; it can also be a cooled, low-temperature liquid flow. The coolant flow L2 is not limited to oil; it can also be water or a mixture of water and oil. In short, any liquid like coolant can be used as the cooling fluid.

[0090] As described in part, the second supply unit 72 can also replace the sprayed liquid flow L2, and as shown by the parenthetical symbols in Figures 2 and 6, spray gas G that does not contain cutting fluid to cool the band saw blade 5 by air cooling.

[0091] The removal section 73 is not limited to using a scraper 73a. For example, as shown in the modified removal section 73A of FIG7, a high-speed gas G2 can be blown from the nozzle 73b onto the surface of the band saw blade 5 to blow away or actively evaporate the adhering liquid, thereby making it dry.

[0092] The band saw 91 may not require torsion of the band saw blade 5. That is, the band saw 91 may not have torsion parts 33 and 34.

[0093] The band saw 91 can also be a horizontal type with axes CL31 and CL32 at an angle that is vertical or close to the vertical direction.

[0094] (Designated by the United States)

[0095] This international patent application relates to U.S. designation, and to Japanese Patent Application No. 2020-186458, filed November 9, 2020, which cites an interest based on priority under U.S. Patent No. 119(a) and incorporates that disclosure.

Claims

1. A band saw for cutting workpieces in a semi-dry manner, comprising: a first wheel and a second wheel, the first wheel applying tension to a band saw blade for tracking, and the second wheel being disposed below the first wheel; A first supply unit, which is disposed in the rotational travel path of the band saw blade between the lowest end of the second wheel, which travels from the second wheel toward the first wheel, and the workpiece cutting position, sprays atomized cutting fluid onto the teeth of the band saw blade. The band saw is characterized by having a removal section disposed between the workpiece cutting position and the second wheel, for spraying or jetting cutting fluid or cooling fluid onto the band saw blade. The removal section is disposed in the section of the band saw blade's rotational travel path from the contact end of the second wheel to the contact beginning of the first wheel, and is disposed between the contact end of the second wheel and the first supply section to remove adhering material to the band saw blade.

2. The band saw according to claim 1, characterized in that, The removal section removes the deposits by sliding the scraper relative to the surface of the traveling band saw blade or by spraying gas without cutting fluid.

3. A workpiece cutting method using a band saw, wherein the workpiece is cut in a semi-dry manner by the band saw, the band saw having a first wheel for tracking by applying tension to a band saw blade and a second wheel disposed below the first wheel; in a first supply section between the lower end of the second wheel, which travels from the second wheel toward the first wheel in the rotational travel path of the band saw blade, and the workpiece cutting position, atomized cutting fluid is sprayed onto the teeth of the band saw blade to cool the band saw blade; in a second supply section between the workpiece cutting position and the second wheel, cutting fluid or cooling fluid is sprayed or jetted onto the band saw blade to cool the band saw blade; the workpiece cutting method using a band saw is characterized in that a scraper disposed in the interval from the contact end of the second wheel to the contact beginning of the first wheel and from the contact end of the second wheel to the first supply section removes adhering material to the band saw blade.

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