JPH1147626A - Metal swarf volume reducing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent swarf in a long state from falling through a discharge hole at the rear surface of a main body while feeding the swarf to the central part of a revolving shaft and to form the entire amt. thereof into chips transportable with a pneumatic chip transporting device. SOLUTION: This volume reducing machine is constituted by oppositely arranging a pair of screw blades 7, 8 which vary in winding directions to allow the feeding of the metal swarf to the central part of the revolving shaft 5 which is pivotally supported at least at both ends in a horizontal cylindrical body 1 opened at the front surface to be made freely rotatable and is driven by a motor 6 at this revolving shaft 5, disposing hand push cutting blades 9, 10 at the central part of the revolving shaft 5, disposing a stationary blade making a pair therewith on the main body 1 side and boring and arranging many discharge holes 14 on the rear surface of the main body 1 near the central part of the revolving shaft 5. In such a case, the hand push cutting blades 9, 10 which are arranged with cut blades at one end of the recessed parts at two points formed on the outer peripheral surfaces and have diameters having small gaps with the inside surfaces of the main body and the discharge holes 14 on the rear surface of the main body are formed only at the shearing regions in the central part, by which the fall of the swarf in the transporting region is prevented, the entire amt. of the swarf is made into the chips and the transportation with the pneumatic chip transporting device is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary screw shearing type metal chip for pulverizing various shapes of metal chips generated when a metal material is machined and making it easily conveyable by using compressed air. It relates to improvement of volume reduction machines.

[0002]

2. Description of the Related Art As a device for mechanically pulverizing metal chips of various shapes generated when a metal material is machined, a metal chip is formed by a shear force generated by an engagement between a shear blade provided on a rotor shaft and a fixed blade. There has been proposed a pulverizing apparatus (Japanese Patent Publication No. 61-7335) which is configured to pulverize and facilitate pulverization of chips of a soft material.

[0003] Other pulverizing devices include a rotating shaft disposed on a central shaft in a casing, a screw for feeding chips formed in a conveying region on the base end side of the rotating shaft, and a shearing region on a distal end side of the rotating shaft. A shear blade protruding radially outward, a fixed blade provided on the inner peripheral surface of the casing, and a discharge port formed in the casing, sending chips to one end in the casing with a screw, a fixed blade and a shear blade. (Japanese Utility Model Laid-Open No. 3-65643) has been proposed.

[0004] In the above-mentioned shearing apparatus, when chips that are entangled and agglomerated are introduced, the chips may not be smoothly fed into the shearing area, or even if they are fed, they may be sheared between the shearing blade and the fixed blade for shearing. In some cases, a load is applied to cause a failure, and shearing cannot be performed well. As a countermeasure, a dispersing fixed blade for dispersing chips is provided in the transfer area of the above-mentioned shearing device, and a concave portion which is recessed in the direction of the rotation axis from the outer peripheral tip at a position corresponding to the dispersing fixed blade of the screw is dispersed. A shearing device (disclosed in Japanese Utility Model Application Laid-Open No. 4-92213) is provided with a blade portion for dispersing chips with the fixed blade for dispersing, and dispersing chips when the fixed blade for dispersion is inserted through the recess when the screw rotates.
Publication), a chip drawing claw for drawing chips into the casing is provided at the tip of the outer periphery of the screw of the above-mentioned shearing device, and the chip drawing claw hooks the chips with the rotation of the casing so that the chip can be pushed into the casing. A processing device (Japanese Utility Model Laid-Open No. 4-9214) has been proposed.

[0005] In addition, a blade is provided at the tip of the outer periphery of the screw of the above-mentioned shearing apparatus, and a fixed blade for rough shearing is provided in the transfer area, and chips in the transfer area are separated by the blade of the screw and the fixed blade for rough shear. Apparatus for transporting to the shearing area after rough shearing (Japanese Utility Model Laid-Open No. 4-9248), and a discharge port for previously discharging metal chips that do not require crushing treatment are provided in the transporting area of the casing of the shearing processing apparatus. , A device that discharges metal chips that do not require crushing in advance
No. 9249) has been proposed.

[0006] The above conventional shearing apparatus has a structure in which one end in a casing is used as a shearing area, chips are sent to a shearing area via a transport area on the other side, and pulverized by a fixed blade and a shearing blade. There is a problem that the thrust force acting on the rotating shaft provided with the one direction becomes unidirectional, the load balance as a whole is poor, and one bearing of the rotating shaft is damaged early.

[0007] Further, in the shearing region of the shearing device,
If the amount of metal chips increases and the load on the motor that rotates the rotating shaft increases, to prevent the motor from overheating and damage, detect the overcurrent value to the motor and turn the motor over. , A safety device that cuts off the power by executing shearing again and detecting overheating of the motor with a temperature sensor
However, until the overheated motor is cooled, the motor cannot be restarted and the operation rate is greatly reduced.

As a pulverizing apparatus which has solved the above-mentioned problems, a rotating shaft which is rotatably supported by rotating at least both ends in a horizontal cylindrical body having an open upper surface and which is driven by a motor has different winding directions. A pair of screw blades are opposed to each other, metal chips can be sent to the center of the rotating shaft, a push blade is protruded at the center of the rotating shaft, and a fixed blade paired with this is provided on the main body side, and the rotating shaft is Metal chip volume reduction machine with a large number of discharge holes arranged in the center of the
When a drive current greater than a preset current value is input, the motor is stopped, the motor is reversely driven for a predetermined time after a predetermined idle time, the motor is stopped again, and the motor rotates normally after a predetermined idle time. A metal chip volume reduction device having power inversion control means for driving, and power supply cutoff control means for shutting off power so as to be able to return to reset when the number of executions of the inversion control exceeds a set number within a set unit time. No. 6-134338).

[0009]

SUMMARY OF THE INVENTION The above-mentioned JP-A-6-134
The metal chip volume reducer disclosed in Japanese Patent Publication No. 338 has an excellent function of solving the various problems of the conventional shearing apparatus, but at the position where the screw shaft of the rotary shaft is installed, the rotation between the rotary shaft and the inner surface of the main body is not performed. The gap is large, and as shown in FIG.
Cutting blade 5 of push cutting blade 52 protruding at the center of rotating shaft 51
Since the gap between the portion other than 3 and the inner surface of the main body 54 is large, the chips are dropped from the discharge holes 55 on the lower surface of the main body 54 while sending the chips to the central portion of the rotating shaft 51. When the chips pulverized by the above method are transported by the compressed air transport device that transports the chips using the compressed air, there is a drawback that long chips are entangled with each other and the transport is hindered.

[0010] The object of the present invention is to solve the problem described in the above-mentioned Japanese Patent Application Laid-Open No.
No. 38 eliminates the disadvantages of the metal chip volume reduction machine disclosed, prevents chips from dropping out of the discharge hole on the bottom surface of the main body while feeding chips to the center of the rotating shaft, and ensures the entire amount. An object of the present invention is to provide a metal chip volume reducing machine capable of reducing the volume to a predetermined size range.

[0011]

According to a first aspect of the present invention, there is provided a metal chip volume reducing machine comprising: a rotating shaft disposed on a central axis in a horizontal cylindrical body having an open upper surface; A pair of screw blades of different winding directions arranged opposite to the rotating shaft to feed metal chips, a push cutting blade provided at the center of the rotating shaft, a fixed blade provided on the main body paired with the pushing cutting blade, In a metal chip volume reduction machine having a large number of discharge holes arranged on the lower surface of the main body near the center of the shaft, a cutting blade is provided at one end of two concave portions formed on the outer peripheral surface as a push cutting blade at the center of the rotating shaft. A push-cutting blade having a small outer diameter with a small gap between the inner surface of the main body is arranged, and the discharge hole on the lower surface of the main body is limited to a central shearing region.

As described above, as the pushing blade at the center of the rotating shaft, the pushing blade having a small outer diameter with a small gap between the inner surface of the main body and the cutting blade disposed at one end of two concave portions formed on the outer peripheral surface is provided. Thereby, the gap between the push cutting blade and the inner surface of the main body becomes small, and long chips can be prevented from dropping from the discharge hole on the lower surface of the main body. In addition, since the discharge hole on the lower surface of the main body is limited to the shearing region at the center of the main body, there is no discharge hole at the screw blade installation position, so even if the gap between the rotating shaft and the inner surface of the main body is large, chips will not fall. In addition, the entire amount of the chips can be reliably reduced to a predetermined size range, and there is no problem in the transportation of the chips to be transported using the compressed air by the compressed air transport device.

According to a second aspect of the present invention, there is provided a metal chip volume reducing machine, wherein at least both ends are rotatably supported in a horizontal cylindrical main body having an open upper surface, and a rotating shaft driven by a motor is provided. A pair of screw blades having different winding directions are arranged opposite to each other so that metal chips can be sent to the center of the shaft, a push blade is arranged at the center of the rotating shaft, and a fixed blade paired with this is provided on the main body side, In a metal chip volume reduction machine in which a number of discharge holes are perforated on the lower surface of the main body near the center of the rotating shaft, a cutting blade is disposed at one end of three or more concave portions formed on the outer peripheral surface as a pushing cutting blade at the center of the rotating shaft. A push-cutting blade having a small outer diameter with a small gap from the inner surface of the main body is arranged, and the discharge hole on the lower surface of the main body is limited to a shearing region at the center only.

As described above, as the pushing blade at the center of the rotating shaft, a pushing blade having a small outer diameter with a small gap from the inner surface of the main body having the cutting blade disposed at one end of three or more concave portions formed on the outer peripheral surface is disposed. As a result, the gap between the push-cutting blade and the inner surface of the main body becomes small, and it is possible to prevent long chips from falling from the discharge hole on the lower surface of the main body, and the chip processing capacity in the shearing region is improved, and the total amount of chips is reliably reduced. The volume can be reduced to a predetermined size range, and there is no problem in the transportation of the chips to be transported by using the compressed air by the compressed air transport device.

Further, according to a third aspect of the present invention, there is provided a metal chip volume reducing machine according to claim 3, wherein at least both ends are rotatably supported in a horizontal cylindrical main body having an open upper surface, and a rotating shaft driven by a motor is provided. A pair of screw blades having different rotation directions are arranged opposite to each other so that metal chips can be fed into the center of the shaft, a push blade is arranged at the center of the rotating shaft, and a fixed blade paired with this is provided on the main body side, In a metal chip volume reduction machine in which a number of discharge holes are perforated on the lower surface of the main body near the center of the rotating shaft, two screw blades with different winding directions are used as the rotating shaft so that metal chips can be sent to the center of the rotating shaft. They are arranged facing each other. In this way, by disposing the two screw blades having different winding directions opposite to the rotating shaft so that metal chips can be fed into the central portion of the rotating shaft, the ability to transport the chips to the central portion is improved, and the shearing is performed. The chip processing capacity in the region is improved, the total amount of chips can be reliably reduced to a predetermined size range, and there is no problem in the transportation of the chips to be transported by using the compressed air by the compressed air transport device.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of a metal chip volume reducing machine according to the present invention will be described with reference to FIGS. 1 is an explanatory top view of a metal chip volume reducing machine according to claim 1 of the present invention, FIG. 2 (a) is a vertical sectional view taken along line AA of FIG. 1, and FIG. 2 (b) is a line BB of FIG. FIG. 3 is an explanatory view of a push cutting blade of the metal chip volume reducing machine according to claim 1 of the present invention, and FIG. 4 is a metal chip having cutting edges arranged at one end of six concave portions according to claim 2 of the present invention. FIG. 5 is an explanatory view of a push cutting blade of a volume reducing machine, and FIG. 5 is a top view of a metal chip volume reducing machine according to claim 3 of the present invention.

1 to 3, reference numeral 1 denotes a cylindrical main body having a horizontal arrangement, an upper surface opened and an inlet chute 2 provided therein.
Reference numeral 4 denotes a bearing disposed at both ends of the cylindrical main body 1, reference numeral 5 denotes a rotating shaft rotatably supported by the bearings 3, 4, and reference numeral 6 denotes a motor with a built-in reduction gear attached to one of the bearings 3. When the motor 6 is driven, the rotating shaft 5 rotates.

Reference numerals 7 and 8 denote a pair of screw blades having different winding directions and arranged opposite to each other with the central portion interposed between the rotary shaft 5. The right-handed and left-handed screw blades 7 and 8 are symmetrical with respect to the central portion of the rotary shaft 5. When the rotary shaft 5 is driven, the screw blades 7 and 8 form a transport area for feeding metal chips to the opposite center side. The inner diameter of the cylindrical body 1 is provided with a predetermined clearance between the inner peripheral surface of the cylindrical body 1 and the screw blades 7 and 8 so that the rotation shaft 5 having the screw blades 7 and 8 can freely rotate. It is. In addition, if the horizontal cylindrical main body 1 can set a shear area in the center and a screw area for chip transport to the center on both sides thereof, the pitch and shape of the screw blades 7 and 8 and the configuration of the shear area in the center are provided. Any known configuration can be adopted according to the shape and size of the metal chips.

Reference numerals 9 and 10 denote a predetermined clearance between the inner surface of the cylindrical main body 1 provided with a cutting edge 12 at one end of two concave portions 11 formed on an outer peripheral surface provided in a shear region at the center of the rotary shaft 5. A pair of push-cutting blades, 13 are fixed blades provided on the cylindrical body 1 side, which are paired with the push-cutting blades 9, 10,
A shearing region is formed by the fixed blade 13 and the metal blade 10, and the metal chips sent from the conveying region to the shearing region by the screw blades 7 and 8 are pushed and cut by the rotating shaft 5.
The cutting blade 12 and the fixed blade 13 are configured to be sheared and pulverized to a predetermined size range. In addition, the push cutting blades 9 and 1
The number of the concave portions 11 formed on the outer periphery of 0 is sufficient at two locations when the processing amount is small, but when the processing amount is desired to be increased, three or more, for example, six concave portions are provided and cut at one end. If the blades 12 are arranged, the metal chips can be sheared and pulverized twice or more as compared with the case of two places.

A plurality of discharge holes 14 are formed in the lower surface of the shearing area of the cylindrical main body 1 so that chips crushed and crushed to a predetermined size range fall from the discharge holes 14 to a chute 15 provided below and are collected. It is configured. The shape and size of the discharge hole 14 are the shape and size of the metal chip, the shape of the screw blades 7 and 8, the shape and size of the concave portion 11 of the push blades 9 and 10, and the inner circumference of the push blades 9 and 10 and the cylindrical body 1. Considering the clearance with the surface and the like, it is determined that the sheared and pulverized chips do not hinder the conveyance of the chips by the compressed air pneumatic conveying device that conveys the chips using compressed air. For example, if the chip length is 35 mm or less, the chips are not entangled and cannot be transported by the compressed air transport device. The shape of the discharge hole may be various combinations such as a circular shape, an elliptical shape, a polygonal shape, or an irregular shape, or a combination of a circular shape and a polygonal shape. When the diameter of the discharge hole provided in the lower part of the shearing region at the center of the horizontal cylindrical body of the metal chip volume reducer of the present invention was 6 mm, the maximum length of the sheared chips was 20 mm, and the chips could be transported by the pneumatic transport device. .

When the metal chips are subjected to the shearing and pulverizing process, the motor 6 is driven to rotate the rotating shaft 5 at a preset number of revolutions. Metal chips of various shapes that have fallen into the inlet chute 2 from the upper part of the cylindrical main body 1 are firstly screw blades 7 having different winding directions,
By 8, they are sequentially fed into a shearing area in the center of the rotating shaft 5 and compressed. Even in such a transport area, the metal chips are transported and compressed to the shearing area while being crushed by the screw blades 7 and 8 and the inner peripheral surface of the cylindrical main body 1.

In a shearing region at the center of the rotating shaft 5, metal chips are sequentially fed and compressed, and are sheared and pulverized by the cutting blades 12 and the fixed blades 13 of the push-cutting blades 9 and 10, so that the discharge holes 1 are formed.
4 and is conveyed and collected by a pneumatic conveying device (not shown) from a chute 15 provided at a lower portion of the cylindrical main body 1. In this case, since the discharge hole 14 of the cylindrical main body 1 is arranged only in the shearing region, even if the gap between the rotary shaft 5 on which the screw blades 7 and 8 are arranged and the inner peripheral surface of the cylindrical main body 1 is large,
The metal chips do not fall during the transportation of the metal chips. Further, since the gap between the outer peripheral surfaces of the push cutting blades 9 and 10 in the shearing region and the inner surface of the cylindrical main body 1 is small, long metal chips do not fall from the discharge hole 14 without being sheared and pulverized during the shearing and pulverization. .

4 and 5, reference numeral 21 denotes a cylindrical main body having a horizontal arrangement, an upper surface opened and an inlet chute 22 provided.
Reference numerals 23 and 24 denote bearing portions disposed at both ends of the cylindrical main body 21, reference numeral 25 denotes a rotating shaft rotatably supported by the bearing portions 23 and 24, and reference numeral 26 denotes a motor with a built-in reduction gear attached to one of the bearing portions 23. Thus, when the motor 26 is driven, the rotating shaft 25 is configured to rotate.

Reference numerals 27a, 27b, 28a, and 28b denote two sets of windings having different winding directions, which are arranged opposite to each other with the center portion interposed therebetween.
Right-handed and left-handed screw blades 2
7a, 27b, 28a, 28b are symmetrical with respect to the center of the rotating shaft 25, and the screw blades 27a, 27b and 28a, 28b are fixed by shifting their installation positions by 180 °. Blade 27
a, 27b, 28a, and 28b are configured to form a transport area for feeding metal chips to the opposite center side. In addition,
The inner diameter of the cylindrical body 21 is determined by the screw blades 27a, 27
A predetermined clearance is provided between the inner peripheral surface of the cylindrical main body 21 and the screw blades 27a, 27b, 28a, 28b so as to ensure free rotation of the rotating shaft 25 provided with b, 28a, 28b. Also, screw blades 27a, 27b,
The pitch and shape of 28a and 28b are appropriately selected according to the shape and size of the metal chips.

Numerals 29 and 30 are provided with cutting blades 32 at one end of six concave portions 31 formed on an outer peripheral surface provided in a shearing region at a central portion of the rotating shaft 25 so as to provide a predetermined clearance between the inner surface of the cylindrical main body 21 and a predetermined clearance. A pair of push-cutting blades 33 is a fixed blade provided on the cylindrical body 21 paired with the push-cutting blades 29, 30. A shearing region is formed by the push-cutting blades 29, 30 and the fixed blade 33, and the screw blades 27a, 27b are formed. , 28a,
The metal chips sent from the conveyance area to the shearing area from 28b are pushed cutting blades 29 and 30 rotating together with the rotating shaft 25.
Is configured to be sheared and crushed by the cutting blade 32 and the fixed blade 33. Reference numeral 34 denotes a discharge hole which is formed by drilling a large number of holes on the lower surface of the shearing region of the cylindrical main body 21. The chip crushed and pulverized is dropped and collected from the discharge hole 34 to a chute provided below. The shape and size of the discharge hole 34 are the shape and size of the metal chip and the screw blades 27a and 27a.
The shapes are determined in consideration of the shapes of b, 28a, 28b, the shape and size of the recess 31 of the pushing blades 29, 30, the clearance between the pushing blades 29, 30 and the inner peripheral surface of the cylindrical body 21, and the like.

When the metal chips are subjected to the shearing and pulverizing process, the motor 26 is driven to rotate the rotating shaft 25 at a preset number of revolutions. Metal chips of various shapes that have fallen into the inlet chute 22 from the upper part of the cylindrical main body 21 are firstly rotated by the screw shafts 27a, 27b, 28a, 28b having different winding directions.
5 It is sequentially fed into the central shearing area and compressed.
The screw blades 27a, 27b, 2
The metal chips 8a, 28b and the inner peripheral surface of the cylindrical body 21 are conveyed and compressed to the shearing region while being crushed.

In the shearing area at the center of the rotating shaft 25, metal chips are sequentially fed and compressed, and the cutting blades 29, 30 are pushed.
After being sheared and crushed by the cutting blade 32 and the fixed blade 33, the paper is discharged from the discharge hole 34 and conveyed and collected from a chute provided at the lower portion of the cylindrical main body 1 by a not-shown pneumatic conveying device. In this case, since the discharge hole 34 of the cylindrical main body 21 is arranged only in the shearing area, the screw blade 27
Even if the gap between the rotating shaft 25 arranged at a, 27b, 28a, and 28b and the inner peripheral surface of the cylindrical main body 21 is large, the metal chips do not drop during the transportation of the metal chips. In addition, since the gap between the outer peripheral surfaces of the push cutting blades 29 and 30 in the shearing region and the inner surface of the cylindrical body 21 is small, long metal chips do not fall from the discharge hole 34 without being sheared and ground during the shearing and grinding. .

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The effective rotating shaft length shown in FIGS.
0mm, blade thickness 9mm, pitch 175mm, outer diameter about 14
A pair of 0 mm screw blades, 100
Each metal chip volume reduction machine provided with a discharge hole with a hole diameter of 5 mm, 6 mm, and 10 mm in the range of mm is mounted on a lathe machine, and shearing and crushing of metal chips of about 50 to 1000 mm generated during processing of ordinary steel. After the treatment, 10 g of chips were sampled, and the hole diameter, the length and the number of chips were examined.
The results are shown in FIGS. Further, when the maximum length of the discharged chips was examined for each hole diameter of the discharge hole, the hole diameter was 5 mm.
mm, the maximum length of the discharged chip is 20 mm, the hole diameter is 6 mm, the maximum length of the discharged chip is 35 mm, and the hole diameter is 10 mm, the maximum length of the discharged chip is 60 mm. It was long enough to cause trouble.

As shown in FIGS. 6A and 6B, when the diameter of the discharge hole is 5 mm or 6 mm, the discharge chip length is 1 mm.
0mm or less occupies 90% or more, even long ones are 20mm
It was below. On the other hand, when the hole diameter of the discharge hole shown in FIG. 6C was 10 mm, the chips were almost equally dispersed to a length of 25 mm or less, and the shearing and pulverizing treatment was not sufficient.

[0030]

According to the first aspect of the present invention, a metal chip volume reducing machine is provided.
A cutting blade is arranged at one end of two concave portions formed on the outer peripheral surface. A push cutting blade having a small outer diameter with a small gap between the inner surface of the main body and the discharge hole on the lower surface of the main body is provided only in a shearing region at the center of the main body. Thereby, the gap between the push cutting blade and the inner surface of the main body becomes small, and it is possible to prevent long chips from dropping from the discharge hole on the lower surface of the main body. Even if the gap is large, chips do not fall in the transport area, the entire amount of chips can be reliably reduced to a predetermined size range, and there is an obstacle to the transport of chips that are transported using compressed air by the compressed air transport device. Will not occur.

According to a second aspect of the present invention, there is provided a metal chip volume reducing machine according to the second aspect of the present invention, wherein a cutting edge is disposed at one end of three or more concave portions formed on the outer peripheral surface, and a gap between the cutting edge and the inner surface of the main body is small. In addition to the arrangement, the discharge hole on the lower surface of the main body is limited to the shearing region at the center of the main body, so that the gap between the push cutting blade and the inner surface of the main body becomes small, and it is possible to prevent long chips from falling from the discharge hole on the lower surface of the main body. In addition to this, the chip processing capacity in the shearing region is improved, the entire amount of chips can be reliably reduced to a predetermined size range, and there is no hindrance to the conveyance of the chips conveyed by using compressed air in the compressed air conveying device. .

Further, in the metal chip volume reducing apparatus according to the third aspect of the present invention, two screw blades having different winding directions are arranged opposite to the rotating shaft so that the metal chips can be fed into the center of the rotating shaft. In addition to improving the ability to transport chips to the center, the ability to treat chips in the shearing area is improved, and the total amount of chips can be reliably reduced to a predetermined size range. There is no hindrance to transport in the device.

[Brief description of the drawings]

FIG. 1 is an explanatory top view of a metal chip volume reducing machine according to claim 1 of the present invention.

FIG. 2A is a vertical sectional view taken along the line AA of FIG. 1;
FIG. 2B is a vertical sectional view taken along line BB of FIG. 1.

FIG. 3 is an explanatory view of a push cutting blade of the metal chip volume reducing machine according to claim 1 of the present invention.

FIG. 4 is an explanatory view of a push cutting blade of the metal chip volume reducing machine according to claim 2 of the present invention.

FIG. 5 is an explanatory top view of a metal chip volume reducing machine according to claim 3 of the present invention.

6A and 6B show a relationship between a discharge hole diameter, a chip length, and the number of discharges in the embodiment. FIG. 6A is a graph showing a relationship between the chip length and the number of discharges when the discharge hole diameter is 5 mm, and FIG.
The figure shows a graph showing the relationship between the chip length and the number of discharges when the discharge hole diameter is 6 mm, and the figure (c) shows the relationship between the chip length and the number of discharges when the discharge hole diameter is 10 mm.

FIG. 7 is an explanatory view of a push cutting blade of a metal chip volume reducing machine disclosed in Japanese Patent Application Laid-Open No. 6-134338.

[Explanation of symbols]

1,21 Cylindrical body 2,22 Inlet chute 3,4,23,24 Bearing 5,25,51 Rotary shaft 6,26 Motor 7,8,27a, 27b, 28a, 28b Screw blade 9,10,29, 30, 52 Push cutting blade 11, 31 Recess 12, 32, 53 Cutting blade 13, 33 Fixed blade 14, 34, 55 Discharge hole 15 Chute 54 Main body

Claims (3)

[Claims] A rotating shaft which is rotatably supported at least at both ends thereof in a horizontal cylindrical main body having an open upper surface and which is driven by a motor. A different pair of screw blades are arranged facing each other,
In a metal chip volume reduction machine in which a press-cutting blade is arranged at the center of the rotating shaft and a pair of fixed blades are provided on the main body side, and a large number of discharge holes are arranged on the lower surface of the main body near the center of the rotating shaft. As a push-cutting blade at the center of the rotating shaft, a push-cutting blade having a slight outer diameter with a small gap between the inner surface of the main body and the inner surface of the main body where the cutting blade is disposed at one end of two concave portions formed on the outer peripheral surface is provided. A metal chip volume reduction machine characterized in that only a central shear area is provided. 2. A rotating shaft which is rotatably supported by rotating at least both ends in a horizontal cylindrical body having an open upper surface and driven by a motor. A different pair of screw blades are arranged facing each other,
In a metal chip volume reduction machine in which a press-cutting blade is arranged at the center of the rotating shaft and a pair of fixed blades are provided on the main body side, and a large number of discharge holes are arranged on the lower surface of the main body near the center of the rotating shaft. As a push-cutting blade at the center of the rotating shaft, a push-cutting blade having a small outer diameter with a small clearance between the inner surface of the main body and the inner surface of the main body where the cutting blade is disposed at one end of three or more concave portions formed on the outer peripheral surface, and a discharge hole at the lower surface of the main body Metal chip volume reduction machine characterized in that only the central shear region is used. 3. A rotating shaft which is rotatably supported by rotating at least both ends thereof in a horizontal cylindrical main body having an open upper surface and which is driven by a motor. A different pair of screw blades are arranged facing each other,
In a metal chip volume reduction machine in which a press-cutting blade is arranged at the center of the rotating shaft and a pair of fixed blades are provided on the main body side, and a large number of discharge holes are arranged on the lower surface of the main body near the center of the rotating shaft. A metal chip volume reduction machine characterized in that two screw blades each having a different winding direction are arranged opposite to the rotation shaft so that metal chips can be fed into the center of the rotation shaft.