JPH07112343A - Chip volume reduction device - Google Patents

Abstract

PURPOSE:To prevent such trouble that it results in the interruption of shredding operation from occurring by increasing reliability of a process where chips are transferred to and bitten into a shredding part by means of screw blades formed in a shaft in a chip volume reducing device for reducing the volume of chips dischafged from a machine tool such as a lathe by shredding them. CONSTITUTION:A shaft 10 which rotates, being driven by a motor 14, is provided in a container 2 which has an opening for throwing chips in its upper part. In the axial center of this device, a chip grinding part 15 which consists of a fixed blade 16 and rotary blade 17 are mounted on the container 2 and the shaft 10. On both sides of the chip shredding part 15, screw blades 21, 22 are formed on the shaft 10. On the screw blades, an biting part 25 which consists of a cutting groove is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip volume reducing device for crushing chips discharged from a machine tool such as a lathe to reduce the volume occupied by the chips.

[0002]

2. Description of the Related Art In machine tools such as lathes, chips are generated during cutting. In this case, it is common practice to divide the chips into an appropriate size with a chip breaker or the like so that the chips do not interfere with the work with the machine tool. The ejected chips are comparatively large and curl-like, so they are quite bulky. Therefore, a large space is required for storing the discharged chips.

As a countermeasure against this problem, a chip volume reducing device has been considered which crushes chips discharged from a machine tool into minute pieces to reduce the volume occupied by the chips. As this chip volume reducing device, for example, a shaft body that is driven by a driving means to rotate is provided in a container having an open portion for chip disposal, and the shaft body is symmetrically arranged on both sides of the center part. A screw blade is formed so that the chips thrown on the shaft can be fed to the central part by the screw blade, and for crushing corresponding to the central part of the shaft and the inner wall of the container at the corresponding location. There is proposed a structure in which a chip crushing part composed of a blade is provided, and the chip crushing part finely crushes the chips and then discharges them from the crushed material discharge hole.

[0004]

According to the above-described chip volume reducing device, in order for the chips to be sufficiently crushed in the crushing section, the chips to be cut into the crushing section by the screw blades are required. Good chipping of the chips in the corresponding blades at the feeding and crushing section is required.

However, when the chips fed into the chip volume reducing device are bent into various shapes, the chips slip on the screw blades and the feeding and the biting are not performed well. There is. In such a state, the crushing process is not carried out, and problems remain in terms of process reliability and maintenance.

In view of the above circumstances, the present invention increases the certainty of the process of sending the chips to the crushing section and crushing them by the screw blades formed on the shaft body, and preventing troubles that make the crushing process impossible. It is an object of the present invention to provide a chip volume reduction device that can be used.

[0007]

In order to achieve the above object, the present invention comprises a shaft body which is driven by a driving means to rotate in a container having an open part for chip disposal at the top, A chip crushing part is provided in the middle part of this shaft and the container inner wall at a location corresponding to this, and a crushed material discharge hole is provided in the lower part of the container, and on the peripheral surface of the shaft on both sides of the chip crushing part. In a chip volume reducing device in which a screw blade that feeds chips from the shaft end side to the chip crushing section side is formed as the shaft rotates, in the chip volume reducing device, a chip biting portion consisting of a cutting groove is formed in the screw blade. It was done.

In the present invention, the screw blade is
It is preferable to form the chip crushed portion so as to have a shape in which the phase is shifted from the symmetrical shape by approximately 180 ° between the one side portion and the opposite side portion.

Further, a pair of wall plates are provided on both sides in the width direction above the container to form an open portion for the input of chips between the both wall plates, and a side corresponding to the chip crushing portion. It is preferable to provide the wall plate with a chip guide surface that forms a wedge-shaped space between the wall plate and the outer periphery of the screw blade.

[0010]

According to the above construction, the chips thrown into the container are sent to the chip crushing section by the screw blades as the shaft rotates. In this case, even if the chips get on the screw blade, they are surely subjected to the feeding action by being bitten by the chip biting portion.

If the screw blade is formed so as to have a shape in which the phase on one side and the side on the opposite side of the chip crushing part are shifted from the symmetrical shape by approximately 180 °, chip crushing The action of pushing back the chips that have passed through the part is surely obtained.

If the chip guide surface is provided so that a wedge-shaped space is formed between the chip guide surface and the outer periphery of the screw blade, the chip is screwed with the rotation of the shaft at this portion. The action of pressing against the wing is obtained.

[0013]

Embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a chip volume reducing device according to an embodiment of the present invention. In these figures, reference numeral 1 is a body of the volume reducing device, which is a container 2 having a horizontally long and substantially semi-cylindrical shape with an open top.
And shaft supporting portions 3 and 4 provided on both sides of the container 2 in the longitudinal direction. A pair of wall plates 5A, 5B extending obliquely upward so as to spread upward are attached to both sides in the width direction above the container 2, and the pair of wall plates 5A, 5B is attached.
Between B, an open portion 6 for chip disposal is formed. Further, an appropriate number of crushed material discharge holes 7 are formed in the lower part of the center of the container 2 in the axial direction.

A shaft 10 is installed in the container 2. Both ends of the shaft body 10 are rotatably supported by the shaft body supporting portions 3 and 4 via bearings 11 and 12, and one end side of the shaft body 10 is connected to a reduction mechanism (not shown) in a reduction gear box 13. Is connected to a motor 14 and is rotationally driven in a fixed direction by the motor 14.

A chip crushing portion 15 is provided at a corresponding position in the axial center portion between the container 2 and the shaft body 10. The chip crushing portion 15 is a fixed blade 16 protruding from the inner surface of one side portion in the width direction of the container 2 toward the shaft body 10.
And a rotary blade 17 protruding from the peripheral surface of the shaft body 10. In the illustrated example, a pair of rotary blades 17 is provided on the circumferential surface of the shaft body 10 every half circumference, and each pair of rotary blades 17 passes along both sides of the fixed blade 16 as the shaft body 10 rotates, thereby fixing the rotary blades 17. The arrangement of the blades 16 and 17 is set so that the chips caught between the blade 16 and the rotary blade 17 are sheared and crushed.

On both the left and right sides (both axial sides) of the chip crushing portion 15, the outer peripheral surface of the shaft body 10 is projected outward.
In addition, screw blades 21 and 22 having a spiral shape are formed. The left and right screw wings 21, 22 are respectively
It is formed so as to feed the chips toward the chip crushing portion 15 at the central portion in the axial direction. That is, as the shaft 10 is driven to rotate in a certain direction, the left screw blade 21 in FIGS. 1 and 2 sends chips from the left to the right, and the right screw blade 22 moves from the right to the left. The twist of each of the screw blades 21 and 22 is set so as to feed the chips.

The left-side screw blade 21 and the right-side screw blade 22 are arranged so that their phases are shifted from each other by about 180 ° due to the symmetrical positional relationship.

A plurality of claw pieces 23 for auxiliary chip shearing with the container 2 are additionally provided at a plurality of locations on the screw blades 21, 22.

Further, each of the screw blades 21 and 22 is provided with a chip engaging portion 25 consisting of a notch groove, and in the illustrated example, each screw blade 21 and 22 has four chip engaging portions 25. They are arranged at predetermined intervals. As shown in the enlarged view of FIG. 4, the chip biting portion 25 is cut in a triangular groove shape, and the edge portion 26 on the rear side with respect to the shaft rotation direction (arrow direction) has an acute angle. It is shaped like a saw blade and has a shape that allows chips to easily bite.

Further, a lower part on the inner surface side of the wall plate 5A above the container on the side corresponding to the chip crushing section 15 extends over a predetermined range in the length direction (a range corresponding to the chip discharging part of the chip conveyor described later). , Bent section 3 with a V-shaped cross section
0 are continuously provided, and a chip guide surface 31 is formed by the lower half of the bent portion 30. This chip guide surface 3
1 forms a wedge-shaped space 32 between the outer periphery of the screw blades 21 and 22 and guides chips in a direction of pressing the chips against the screw blades 21 and 22 as the shaft 10 rotates. In the illustrated example, the chip guide surface 31
Although it is formed substantially vertically, the chip guide surface 31 may be formed in a shape that is inclined or curved inward slightly.

This chip volume reducing device is provided with an underframe 27
The chip conveyor is installed at a position corresponding to a chip discharging portion (not shown) of a chip conveyor assembled to a machine tool such as a lathe. A crushed material storage container (not shown) is installed below the crushed material discharge hole 7 of the chip volume reducing device.

The operation of the chip volume reducing device of this embodiment as described above will be described below.

Chips C passed from the machine tool through the chip conveyor are thrown into the container 2 through the open portion 6 and fall onto the shaft 10. Then, with the rotation of the shaft body 10,
The chips on the shaft body 10 are pushed by the surfaces of the screw blades 21 and 22 on the feed direction side and move to the central portion in the axial direction.
It becomes a fine crushed material C'by being bitten between and shredded and crushed. The crushed material C ′ is discharged from the crushed material discharge hole 7.

By the way, in such a treatment, the chips C falling on the shaft body 10 are screw blades 21, 2.
If it enters the valley between the two blades, it will be fed by the screw blades 21,22, but depending on the chip C, it will ride on the top (outer peripheral portion) of the screw blades 21,22 and the valley will be formed. It may be difficult to get in. Even in such a case, according to the apparatus of the present embodiment, the chip C can be fed and caught well.

That is, since the screw blades 21 and 22 are provided with the chip engaging portion 25 consisting of a notch groove, the chip C also on the top of the screw blades 21 and 22 is chip engaging portion. By being bitten into 25, it is sent to the chip crushing section 15 without slipping on the screw blades 21 and 22. Therefore, the screw blade 21,
Feed of chip C by 22 and chip crushing part 1
The certainty of the crushing process in 5 is increased.

Further, since the left and right screw blades 21, 22 are arranged so as to be 180 ° out of phase with each other, for example, the chip C that has moved on the top of the one screw blade 21 has a chip crushing portion. Even if it passes and reaches the side of the other screw blade 22, it does not ride on the top of this screw blade 22, and is reliably pushed back by the screw blade 22 and sent to the chip crushing section 15. This also increases the certainty of the feeding and crushing process.

Further, since the chip guide surface 31 as described above is provided on the wall plate 5A above the container 2, chips are formed in the wedge-shaped space 32 between the chip guide surface 31 and the screw blades 21 and 22. Since the action of compressing C along with the movement in the shaft rotation direction and pressing it against the screw blades 21 and 22 is obtained, the reliability of the feeding and crushing process is further enhanced.

In this apparatus, the number and arrangement of the chip crushing portions 25 provided on the screw blades 21 and 22 may be changed appropriately.

[0029]

As described above, according to the present invention, the chip crushing portions are provided at the corresponding positions of the container and the shaft body, and the chips are fed to the shaft body on both sides thereof as the shaft body rotates to the chip crushing portion. In a chip volume reduction device equipped with screw blades,
Since the chip engaging portion formed of the notch groove is formed on the screw blade, the chips on the screw blade can be reliably fed to the chip crushing portion. Therefore, it is possible to improve the reliability of the crushing process, prevent a trouble that makes the crushing process impossible, and facilitate maintenance.

Further, if the screw blade is formed so that the portion on one side and the portion on the opposite side of the chip crushing portion sandwich the chip crushing portion, and the phases are shifted from each other by approximately 180 ° from the symmetrical shape, one side of The chips that have moved on the screw blade and passed through the chip crushing portion can be reliably pushed back by the screw blade on the opposite side, and the reliability of the crushing process can be further enhanced.

Further, if a chip guide surface forming a wedge-shaped space with the outer periphery of the screw blade is provided on the wall plate on the side corresponding to the chip crushing portion above the container, this portion is provided. Since the effect of pressing the chips against the screw blade is obtained, the reliability of the crushing process can be further enhanced.

[Brief description of drawings]

FIG. 1 is a plan view of a chip volume reducing device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an enlarged view of a portion where a chip crushing portion is formed in a screw blade.

[Explanation of symbols]

 1 main body 2 container 6 open part for chip input 7 crushed material discharge hole 10 shaft body 15 chip crushing part 21, 22 screw blade 25 chip biting part

Claims (3)

[Claims] 1. A shaft body which is rotated by being driven by a driving means is provided in a container having an open portion for chip disposal at an upper portion, and an intermediate portion of the shaft body and a container inner wall at a portion corresponding to the shaft body. A chip crushing section is provided on the bottom of the container, and a crushed material discharge hole is provided at the bottom of the container.On the peripheral surface of the shaft on both sides of the above chip crushing section, from the shaft end side to the chip crushing section as the shaft rotates A chip volume reducing device in which a screw blade for feeding chips toward the chip is formed, wherein the screw blade is provided with a chip engaging portion formed of a cutting groove. 2. The screw blade is formed such that a portion on one side and a portion on the opposite side of the chip crushing portion sandwiching the chip crushing portion have a shape in which the phases are shifted by approximately 180 ° from each other. The chip volume reducing device according to claim 1. 3. A pair of wall plates are provided on both sides in the width direction above the container to form an open part for the input of chips between the both wall plates, and a side corresponding to the chip crushing portion. 3. The chip volume reducing device according to claim 1 or 2, wherein the wall plate is provided with a chip guide surface that forms a wedge-shaped space between the wall plate and the outer periphery of the screw blade.