JP4533509B2 - Cooling method of circular saw in circular saw cutting machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for cooling a circular saw in a circular saw cutter and a circular saw suitable for carrying out this cooling method.
[0002]
[Prior art and problems]
In a circular saw cutting machine, as seen in high-speed machining, not only the cutting conditions become increasingly severe to increase productivity, but also the frequency of processing difficult-to-cut materials to improve product performance. It has increased. As a result, the saw blade becomes extremely hot during the cutting process, resulting in a decrease in machining accuracy, a deterioration in the properties of the workpiece cutting surface, and a shortened tool life.
[0003]
As countermeasures, a method of supplying cutting oil to the saw blade portion of the circular saw and cooling the saw blade has been conventionally employed. However, in recent years, processing that considers the global environment has been proposed, and a tool that does not use cutting oil. Although a cooling method such as a cooling method using cold air has been developed, it has not yet been a practical measure.
[0004]
An object of this invention is to provide the cooling method of the circular saw in the circular saw cutting machine which can eliminate the above conventional problems. A further object of the present invention is to provide a circular saw suitable for carrying out the above cooling method.
[0005]
[Means for Solving the Problems]
The method of cooling a circular saw in the circular saw cutting machine according to the first aspect of the present invention provides a coolant reservoir 4 at the lower portion of the circular saw cover 3 in the circular saw cutting machine, in which a liquid refrigerant is stored, and the surface of each saw blade While the workpiece W is being cut by the circular saw 1 provided with the refrigerant holding means, each saw blade 8 that has finished cutting the workpiece W is immersed in the refrigerant in the refrigerant reservoir 4 to be cooled, and the refrigerant is held during the immersion. When the saw blade 8 holding the refrigerant in the means next cuts the workpiece W, the saw blade 8 is cooled by using the heat of vaporization accompanying the evaporation of the held refrigerant by the cutting heat of the saw blade 8. To do. Here, the “cutting heat” means “heat generation due to shearing and friction of a processing point accompanying cutting”, and the following “cutting heat” is also the same.
[0006]
The method of cooling a circular saw in circular saw cutting machine of the invention according to claim 2 supplies the mist-like refrigerant inside the circular saw cover 3 in circular saw cutting machine, the circular saw 1 This mist coolant saws Each saw blade 8 provided with coolant holding means on the blade surface is wetted, and the saw is used by utilizing the heat of vaporization accompanying evaporation of mist-like refrigerant by the cutting heat of each saw blade 8 during the cutting of the workpiece W by the circular saw 1. The blade 8 is cooled.
[0007]
A third aspect of the present invention is the method of cooling a circular saw in the circular saw cutting machine according to the first or second aspect, wherein the coolant is water.
[0008]
A fourth aspect of the present invention is the method of cooling a circular saw in the circular saw cutting machine according to the first or second aspect, wherein the refrigerant is ethanol.
[0010]
According to a fifth aspect of the present invention , in the method of cooling a circular saw in the circular saw cutting machine according to the first aspect , the refrigerant holding means is formed of a recessed portion 9 formed in a required front portion of each saw blade 8. To do.
[0011]
Claim 6 is the method of cooling a circular saw in circular saw cutting machine according to claim 1 or 2, wherein the refrigerant holding means, formed by thermal spraying of ceramics to the surface desired portion of the saw blade 8 porosity It is characterized by comprising a quality layer 12.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a circular saw that is rotatably supported by being supported by a swing frame or a linearly movable saw frame 2 in a circular saw cutter. Then, the workpiece W at the cutting position moves forward and backward to perform cutting. A circular saw cover 3 is provided on the saw frame 2 so as to cover a required portion of the circular saw 1. The circular saw cover 3 is composed of a pair of side plates 3a, 3a in a side view and a peripheral plate portion 3b connecting the outer peripheral edges of the side plates 3a, 3a. A water reservoir 4 is formed between the side plates 3a, 3a and the outer peripheral plate portion 3b. The water reservoir 4 is formed to a depth that allows each of the saw blades 8 of the circular saw 1 to be sufficiently immersed in the state where water is stored in the water reservoir 4.
[0013]
The circular saw 1 is formed by forming a blade body 6 at a predetermined circumferential pitch on the outer peripheral edge of the circular saw body 5 and attaching a carbide tip 7 to each blade body 6. A saw blade 8 is constituted by the cemented carbide tip 7 attached thereto. Each cemented carbide tip 7 has a recessed portion as a holding means for holding water at the center portion of the second rake face 7b adjacent to the first rake face 7a forming the cutting edge of the tip 7 on the front side in the turning direction. 9 is formed. The concave recess 9 draws and holds water when each of the saw blades 8 passes through the water stored in the water reservoir 4 when the circular saw 1 rotates, and carries it to the cutting point (processing point) of the workpiece W. Is for. Reference numeral 10 denotes a flank of the carbide tip 7.
[0014]
When the workpiece W is cut by the circular saw cutting machine having the circular saw 1 as described above, as shown in FIG. 1, water is stored in a water reservoir 4 formed at the lower part of the circular saw cover 3, Each saw blade 8 is immersed in the water in the water reservoir 4 when the saw 1 rotates. Thus, when each saw blade 8 cuts the workpiece W along with the rotation of the circular saw 1, each saw blade is caused by heat generated by shearing and friction of the processing point accompanying the cutting (hereinafter simply referred to as "cutting heat"). 8, especially the tip of the carbide tip 7 becomes a high temperature of about 700 ° C., for example. When one carbide tip 7 that has finished cutting the workpiece W turns to the water reservoir 4, this carbide tip 7 is While passing through the water reservoir 4, it is immersed in water and cooled by water. At this time, water is slightly adhered to the surface portion of the chip 7, and water is pumped into the recessed portion 9 on the front end surface of the chip 7.
[0015]
Until the cemented carbide tip 7 cooled by the water reservoir 4 as described above cuts the workpiece W next, the water contained in the recessed portion 9 of the tip 7 is put into the recessed portion 9 by centrifugal force. Retained. Thus, when the cemented carbide tip 7 cuts the workpiece W, the water held in the surface portion of the tip 7 and the water in the recessed portion 9 evaporate due to the cutting heat as described above. As the heat of vaporization when evaporating, the heat of the cemented carbide tip 7 is taken away, thereby preventing the carbide tip 7 itself from becoming high temperature, that is, the cemented carbide tip 7 is always maintained at 100 ° C. or less, At the same time, a decrease in strength and hardness of the cemented carbide tip 7 is suppressed. As a result, the tool life is extended.
[0016]
The water supply to the water reservoir 4 of the circular saw cover 3 may be automatically performed by installing a water supply hose on the upper side of the circular saw cover 3, or the circular saw 1. It can also be done manually with a scissors when stopping.
[0017]
In the said embodiment, although water is utilized as a refrigerant | coolant, ethanol is mentioned as a refrigerant | coolant with big vaporization heat other than water. When the refrigerant is 100% ethanol, the amount of evaporation per unit time is about 3.6 times that of water, and when the refrigerant is a mixture of 50% water and 50% ethanol, the amount of evaporation per unit time is about 2 It was 0.0 times. Assuming that 1 kg of water has evaporated, the heat of vaporization of water is 2250 kJ / kg, so that heat of 2250 kJ can be removed. In the case of a 100% ethanol solution, 3.6 kg (= 1 kg × 3.6) is evaporated under the same conditions, and since the heat of vaporization of ethanol is 860 kJ / kg, it is about 3100 kJ (= 860 kJ × 3.6). ) Heat can be removed. When actually used, water is selected as the refrigerant from the viewpoint of cost, but if this is used as ethanol, the cooling efficiency is increased by about 1.4 times (= 3100 kJ / 2250 kJ).
[0018]
Like the circular saw 1 shown in FIG. 3, each cemented carbide tip 7 has a water reservoir 4 formed by forming a recessed portion 9 (water holding means) in a required portion of the front end surface of each cemented carbide tip 7. When passing, the water can be surely pumped and held in the recessed portion 9 and can be effectively transported as it is to the next processing point (cutting point). The circular saw 11 shown in FIG. 4 is thin by spraying ceramics or the like as a holding means on the front surface side of the cemented carbide tip 7 forming each saw blade 8 excluding the cutting edge portion (first rake face 7a) ( (Thickness of about 1 to several μm) The porous layer 12 is formed.
[0019]
In the holding means comprising the porous layer 12 as described above, when the circular saw 1 rotates and each saw blade 8 passes through the water stored in the water reservoir 4, the water in the water reservoir 4 becomes porous. 12 is impregnated and held. The water impregnated in the porous layer 12 evaporates from the entire area of the porous layer 12 due to the heat of the cemented carbide chip 7, and the heat of the cemented carbide chip 7 is effectively taken away by the heat of vaporization at that time. The temperature of 7 is effectively lowered.
[0020]
FIG. 5 shows a circular saw 1 and a circular saw cover 3 similar to the circular saw cutting machine of FIG. 1, but the circular saw cover 3 shown here is not provided with a water reservoir 4, and this water reservoir 4 Instead of this, a mist injection nozzle 13 is inserted into the upper part of the circular saw cover 3 and water mist is injected and supplied into the circular saw cover by the mist injection nozzle 13 to wet the saw blade 8 of the circular saw 1. To be. The mist injection nozzle 13 is connected to a water mist supply device 14. A conventional oil mist supply device can be used as the water mist supply device 14 as it is.
[0021]
Therefore, when the workpiece W is cut by this circular saw cutting machine, water mist is supplied to the inside of the circular saw cover 3 by the mist injection nozzle 13 so that the inside of the circular saw cover 3 is in a water mist state. When the surface of the saw blade 8 is moistened, when the cemented carbide tip 7 of the wet saw blade 8 cuts the workpiece W, moisture adhering to the surface of the tip 7 evaporates due to the cutting heat, and the heat of vaporization when the moisture evaporates. As a result, the carbide tip 7 is deprived of heat, thereby preventing the carbide tip 7 itself from becoming high temperature, and at the same time maintaining the strength and hardness of the carbide tip 7. As a result, the tool life is extended.
[0022]
Also in this embodiment, the mist is not limited to the water mist, and a liquid in which a liquid other than water such as ethanol is mist can be used.
[0023]
In the circular saw 4 according to the embodiment described above, the saw blades 8 are formed on the outer peripheral edge portion of the circular saw body 5 at a predetermined pitch in the circumferential direction, and the carbide tips 7 attached to the respective blade bodies 6. However, the circular saw according to the present invention is not limited to such a configuration, and a saw blade is directly formed on the outer peripheral edge of the circular saw body at a predetermined pitch in the circumferential direction. A circular saw without a hard tip may be used.
[0024]
【The invention's effect】
According to the cooling method of the present invention as described above, the effect of cooling the saw blade of the circular saw and keeping its temperature low, that is,
(1) It is possible to stabilize the geometric shape and size of the saw blade of the circular saw and increase the cutting accuracy.
(2) The property of the cut surface of the work can be improved.
(3) The reduction in the strength and hardness of the saw blade can be suppressed and the tool life can be extended as much as possible. Such effects as described above can be obtained with a completely clean cooling method using vaporization heat that is friendly to the global environment and does not use cutting oil for cooling the saw blade. Moreover, compared with the cold air cooling method, the equipment cost and running cost of the cooling system can be greatly reduced, and the economic effect is enormous.
[0025]
In particular, the invention according to claim 1 is provided with a coolant reservoir in the lower part of the circular saw cover, in which a liquid coolant is stored, and each saw blade that has finished cutting the workpiece is immersed in the coolant reservoir for cooling, and the immersion Sometimes, when the saw blade holding the coolant in the coolant holding means provided on the surface of each saw blade next cuts the workpiece, the saw blade is used by utilizing the heat of vaporization accompanying evaporation of the retained coolant by the cutting heat of the saw blade. refrigerant because it is a method for cooling, by a two-stage cooling of the cooling due to vaporization heat utilization of cooling and the liquid coolant by immersion in liquid coolant, can be very effectively cooled saw blade Rutotomoni, each saw blade surface By providing the holding means, the liquid refrigerant can be effectively conveyed from the circular saw cover to the processing point, and each saw blade can be cooled more effectively.
[0026]
The invention according to claim 2 supplies a mist-like refrigerant to the inside of the circular saw cover, wets each saw blade provided with refrigerant holding means on the surface of the circular saw blade by the mist-like refrigerant, This is a method of cooling the saw blade using the heat of vaporization caused by the evaporation of the mist-like refrigerant by the cutting heat of the saw blade, without making the circular saw cover special structure or special processing on the circular saw side The existing circular saw cover and the circular saw can be used as they are to effectively cool the saw blades, and by providing a refrigerant holding means on the surface of each saw blade, the mist-like refrigerant is contained in the circular saw cover. Can be effectively transported from the machining point to the machining point, and each saw blade can be cooled more effectively .
[0027]
According to the method described in claim 3, the inventions according to claim 1 and claim 2 can be implemented more economically, and according to the method described in claim 4, the cooling efficiency can be further improved. It can be further enhanced.
[0029]
As described in claim 5 , if the refrigerant holding means is made of a recessed portion formed in a required portion on the front surface of each saw blade, it is particularly effective when the cooling method of claim 1 is carried out. It is possible to reliably hold the refrigerant in each saw blade.
[0030]
As described in claim 6, when the refrigerant holding means, consisted of a porous layer formed by spraying ceramics on the surface required of each saw blade, a liquid or a mist-like refrigerant saw It can be easily held in a wide area on the blade surface to efficiently evaporate and increase the cooling efficiency.
[Brief description of the drawings]
FIG. 1 is a side view of a circular saw cutter for explaining an embodiment of the present invention.
FIG. 2 is a front view of the same circular saw cutter.
FIG. 3 is an enlarged perspective view showing one saw blade of a circular saw, showing a case where the holding means is formed of a recessed portion.
4 is an enlarged perspective view showing one saw blade of a circular saw as in FIG. 3, and shows a case where the holding means is made of a porous layer.
FIG. 5 is a side view of a circular saw cutter for explaining another embodiment.
FIG. 6 is a front view of the same circular saw cutter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Circular saw 3 Circular saw cover 4 Water reservoir 5 Circular saw body 6 Blade body 7 Carbide tip 8 Saw blade 9 Recessed part (holding means)
12 Porous layer (holding means)

Claims (6)

In the circular saw cutting machine, a coolant reservoir is provided at the bottom of the circular saw cover, liquid coolant is stored in this, and the workpiece has been cut while the workpiece is being cut by the circular saw with coolant holding means on the surface of each saw blade. Each saw blade is immersed in the refrigerant in the refrigerant reservoir for cooling, and when the saw blade that holds the refrigerant in the refrigerant holding means at the time of the immersion cuts the workpiece next, the holding by the cutting heat of the saw blade A method for cooling a circular saw in a circular saw cutting machine, wherein the saw blade is cooled by using the heat of vaporization accompanying the evaporation of the refrigerant. A mist-like refrigerant is supplied to the inside of the circular saw cover in the circular saw cutting machine , and each saw blade provided with refrigerant holding means on the surface of the saw blade of the circular saw is moistened by this mist-like refrigerant to A method of cooling a circular saw in a circular saw cutting machine, wherein the saw blade is cooled by using heat of vaporization accompanying evaporation of a mist-like refrigerant by cutting heat of each saw blade during cutting.   The method for cooling a circular saw in the circular saw cutter according to claim 1, wherein the refrigerant is water.   The method for cooling a circular saw in a circular saw cutter according to claim 1 or 2, wherein the refrigerant is ethanol. 2. The method of cooling a circular saw in a circular saw cutter according to claim 1 , wherein the refrigerant holding means comprises a recessed portion formed in a required front portion of each saw blade. The refrigerant holding means, a method of cooling a circular saw in circular saw cutting machine according to claim 1 or 2, characterized in that a porous layer formed by spraying ceramics on the surface desired portion of the saw blade .

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