KR810000301B1 - Cutting apparatus for the billet - Google Patents

Abstract

This apparatus is composed of the stationary die(1) and the shaking die(2) in which the concave part for holding billet is shaped, the movable die(3) and the movable shaking die(4) are contiguous on the level frame at the vertical direction of concave part, the guide block(10) for movable shaking die and the die opening and shutting equipment fitted between the stationary die and the shaking die.

Description

Billet Cutting Device

1 is a front view of the billet cutting device according to the present invention.

2 is a plan view of FIG.

3 is a cross-sectional view taken along the line III-III of FIG.

3 is a cross-sectional view taken along the line IV-IV of FIG.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a billet cutting device for cutting billets for use in extrusion presses.

Conventionally, billets, such as aluminum used in extrusion presses, have been used beforehand to cut to a predetermined length to a suitable temperature, which is a long time recently due to wasteful use of the billet, which is uneconomical. The billet is first heated to a suitable temperature in a furnace, and this long billet is cut | disconnected by the appropriate length outside the furnace as needed, and the conventional apparatus. For example, in US Patent No. 3,348, 441, cylindrical fixed dies which are adjacent to each other and cylindrical moving dies which move in a vertical direction in contact with them are placed on the same horizontal axis and placed on the same horizontal axis. A method of inserting a billet into a circumferential hole therein and transferring the billet by moving the movable die vertically, the same size and formation as the cross section of the billet to cut the circumferential hole of the fixed end and the movable die. It is not possible to design in advance, and some space | interval will necessarily arise between the inner surface of a fixed die and a moving die, and the outer surface of a billet. This is because it is necessary to make the inner diameter of the die larger than the outer diameter of the billet because it inserts the billet into the lifejacket, but if there is a gap between the fixed teeth and the inner surface of the movable die and the billet, When cutting the billet, the cut surface of the billet becomes elliptical by the distance between the inner surface of the die and the billet, and the cut end is struck down to form a round shape.

In general, the foot used in the aluminum extrusion press uses a continuous cast, and the outer diameter of the billet is not as accurate and constant as that of the machined machine, so that there is no gap between the inner surface of the die and the billet. It is impossible.

Therefore, it was necessary to considerably increase the thickness of the die, increase the body width of the billet, and prevent the deterioration of the shear function.

In this way, if the cutting surface of the billet becomes elliptical, the cutting surface becomes bad at right angles, and the cutting end is struck down to form a round shape or the shape of the billet becomes bad, the compression process by the following extrusion press An eccentric load is applied to the stem for extruding the billet, which causes a step breakage accident, and the cutting end is crushed, which causes air filling in the extrusion process, thereby obtaining a high-quality extruded product. The result is not.

Originally, when the billet is cut in shear, the cutting surface of the billet is retracted in the cutting direction, and is widened in the direction perpendicular to the cutting direction so as to become an elliptical shape.

In order to minimize this deformation, it is preferable to use a die that completely constrains the outer circumference of the billet during cutting. In contrast, the die is inserted into the die in the pre-cutting step of the cutting or when the billet is extracted from the die. It should not be constrained from the die, ie there is a gap between the billet and the die.

In order to satisfy this conflicting condition, a semi-cylindrical fixed die and semi-circle having an inner surface with a curvature of the same size as the outer diameter of the billet, as disclosed in Japanese Utility Model Application No. 48-13024. Dividing into a normal first moving die, and dividing the cylindrical moving die into second and third moving dies of a bar having an inner surface dominated by the outer diameter of the billet and a small curvature, and closely contacting the dividing surfaces of the die. At the same time, a cutting device was proposed in which the sheet was brought into close contact with the billet and the die was released from the billet in the back and forth process. However, this was to make both the clamping direction and the cutting direction of the billet by the die in the vertical direction, that is, in the same direction.

Therefore, the cutting surface tends to extend in the direction perpendicular to the cutting direction at the time of cutting, so that the billet remaining on the fixed shaft after cutting is removed from the fixed shaft die, and then returned to the toe and inserted into the die for cutting. A slightly wider section suffers from the problem that the cut surface touches the die end, preventing insertion and clamping smoothly or securely. In order to solve this problem, the applicant has proposed a billet cutting device in which each of the fixed and moving dies is divided into two and the clamping direction of the divided dies is perpendicular to the cutting direction. [See Utility Model Publication 49-87935].

In this conventional apparatus, both the fixed die and the moving die are divided into semi-cylindrical dies that can be separated from each other in the horizontal direction (left and right), clamping the billet from left and right, and moving the moving die in the vertical direction to cut the billet. The above-mentioned problem solves the drawback that the cutting surface becomes an elliptical shape wider in the direction perpendicular to the cutting direction, and when the next cutting of the billet remaining in the previous cutting, the billet can be easily inserted into the die. Was.

However, because the clamping of the cylindrical moving die is carried out in one large clamp cylinder attached vertically to the front of the apparatus (that is, the number of clamp cylinders used), the height of the apparatus is not unnecessarily increased, Since the clamping cylinder of the up-down stroke is used to perform the left and right sieve indirectly through the chain mechanism, the sieve mechanism of the semi-cylindrical mobile die is complicated. In general, the conventional billet cutting device has a drawback in that the body part mechanism is large because the vertical cutting device is vertical. Since a shear cylinder of up and down strokes must be attached to the lower side of the apparatus, for example, it is necessary to form a hole through the bottom surface to accommodate the shear cylinder at this speed, so that installation work is complicated and equipment costs are increased. do.

Therefore, an object of the present invention is to provide a billet cutting device with a simple structure and compact, compared to the conventional billet cutting device to solve the above-mentioned drawbacks.

According to the present invention, there is provided a horizontal frame, a set of lower fixed dies and an upper swinging die each having a semicircular recess in a section for billet charging, and another set of lower movable dies and upper movable swings. Die (one set different from the one set is provided adjacent to the axial direction of the recess, and the other lower set of the moving die and the upper movable swing die are integrated so as to slide relative to the set in the horizontal direction perpendicular to the axial direction of the recess. And the upper swing die and the upper swing die are back and forth in the vertical direction with respect to the lower fixed die and the lower movable die, respectively, and fixed in the horizontal direction, and means for sliding the other set of the lower movable die and the upper swing die. And means for rocking the upper swing die and the upper swing die, respectively; To provide a device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the billet cutting device of the present invention shown in FIGS. 1 to 3, 1 is a lower fixing die, 2 is an upper swing die, 3 is a lower movable die, 4 is a movable swing die, 5, 6, 7 is a main part of semi-circular cross section for billet charging provided in the said die | dye 1, (2), (3), (4).

The fixed die 1 and the upper swing die 2 are arranged with the recessed portions 5 and 6 facing each other, and the lower movable die 3 and the upper movable swing die 4 are recessed portions 7, (8) is placed facing each other, and one set consisting of the lower fixed die (1) and the upper swing die (2), and the other set consisting of the lower movable die (3) and the upper movable swing die (4) The book was placed on the horizontal frame 10 with the book 5-8 adjacent to each other in the axial direction.

The lower movable die 3 and the upper movable swing die 4 are integrally formed of the upper fixed die 1 with the lower fixed die 1 in a horizontal direction perpendicular to the axial direction of the recesses 7 and 8. In one pair, the cylinder 9 operates with a horizontal lock fixed to the horizontal frame 10. The piston lot 9a of the cylinder 9 is integrally connected to the ends of the lower movable die 2 and the upper upper movable swing die 4. 11 is a guide plate attached to the horizontal frame 10, 12 is a guide shoe attached to the lower surface of the lower movable die (3), 13 is between the lower fixed die (1) and the lower movable die (3), and the upper A guide plate provided between the swinging die 2 and the upper movable swinging die 4, 14 is a stopper, 15 is a guide block fixed to the horizontal frame 10, 16 is a guide block fixed on the upper swinging die (2).

The lower movable die 3 is guided to the guide block 15 and the upper movable swing die 4 is guided to the guide block 16 to slide.

Of course, the guide plate 13 is also provided on the sliding surface between the upper movable swing die 4 and the guide block 16 and the sliding surface between the lower movable die and the guide block 15.

The upper movement swing die 4 swings upward and downward with respect to the movement die 3 about the axis 18 provided in parallel with the axial direction of the recessed portion 8 at the first end thereof.

In addition, the upper movable swing die 2 has a shaft 17 at an end that is closely joined to the first end, and the shaft 17 and the shaft 18 are provided on substantially the same axis line. Accordingly, the upper swing die 2 is swinged in an up and down direction with respect to the lower fixed die about the shaft 17.

The guide block attached to the upper surface of the upper swing die 2 attaches the lower part to the upper movable swing die 4 and attaches the bracket 19 with the upper part slightly away from the guide block 16. Then, a clevis-shaped cylinder 20 is attached to the bracket 19, and one end of the first link 22 is rotated to the front end of the piston rod 21 of the cylinder 20. The other end of the first link 22 was rotated in the bracket 923 attached to the upper swinging die 4. In addition, one end of the second link 24 is pivotally mounted at the center of the first link 22 so that the other end of the second link 24 is pivoted to the bracket 25 mounted at the lower moving die 3. Mounted. The cylinders 20, links 22, 24, etc. attached between the bracket 19, the lower movable die 3, and the upper movable swing die 4 may be referred to as a die opening and closing device 26. By operation of (20), it is possible to open and close the moving part movement swing die 4 by swinging it up and down about the axis 18. Between the guide block 16, the lower fixing die 1, and the upper swinging die 2, it has the same mechanism as that of the die closing device 26 described above, and has a bracket 27, a cylinder 28, a piston rod. A die opening and closing device 30 consisting of (29) and the like was attached. By operating the cylinders 20 and 28 simultaneously, the upper swing die 2 and the upper swing die 4 are opened and closed at the same time.

This opened width was set to about 10 mm at the end.

The upper surface of the lower fixed die 1 and the lower surface of the upper swing die 2, and the upper surface of the lower movable die 3 and the lower surface of the upper movable swing die 4 each have recesses and convex portions. The fitting part 31 which consists of these was provided, and the shaft center of each recessed part 5-8 was made to match.

As described above, the operation of the billet cutting device according to the embodiment of the present invention will be described below.

As shown in FIG. 4, a long billet heated to an appropriate temperature in a heating device 401 (not shown in some of FIG. 1, 2, and 3 to simplify the drawing) 400 is carried by a billet carrier 402 with a roller 403 to reach the die assembly. When cutting the billet, first, as shown by the dashed line in FIG. 1, the die opening and closing devices 26 and 30 are operated to keep the upper swing die 2 and the movable swing die 4 open. The long billet 400 in the recessed portion 5-8 is stopped at the position where the necessary length of the billet is combined. In this case, the billet uses a billet having a curved surface substantially the same as the curved surface of the recessed portion 5-8. Subsequently, the die opening and closing devices 26 and 30 are operated to close the upper moving die 4 of the upper swing die 1, and the billets are fitted into the recesses 5-8 so as to fit.

Next, by operating the cylinder 9, the lower movable die 93 and the upper movable swing die 4 are integrally slid in a horizontal direction perpendicular to the axis of the recesses 5-8 to be cut by the billet shearing. do. At this time, one set of the lower movable die 3 and the upper movable swing die 4 moves to a position (indicated by an imaginary line in FIG. 4) in contact with the stopper 14, so that the recesses 7 and 8 are The extrusion cylinder 406 attached to the lower fixed die 1 faces, while the lower movable die 3 is provided on the set of recesses 5 and 6 of the lower fixed die 1 and the upper swing die 2. The return cylinder 407 attached thereto faces. Therefore, the dielet is pressed by the extrusion cylinder 406 in the operating state, placed in the roller 405 of the roller table 404 fixed to the lower moving die 3, and taken out. On the other hand, the remaining billet including the billet in the recesses 5 and 6 is pressed by the cylinder 407 returning to the operating state, placed in the roller 403 of the billet carrier 402, and the heating device 401. 1) the cutting process is completed.

Of course, the timing operations of the die opening and closing devices 26 and 30, the cylinder 9, the extrusion cylinder 406, the return cylinder 407, and the like can be performed by either manual or automatic. If the billet outer diameter is different, the die assembly may be replaced with an equivalent die assembly.

The remaining billet cut is returned to the heating device 401 and heated again, and then taken out again when necessary, and the billet is cut to an appropriate length. In this case, the billet cut first is cut by horizontal force and thus the billet is cut. Even if the mortar of the trough has an elliptical shape that is elongated in the vertical direction, the billet is made by entering and exiting the billet with the recessed portion 5-8 having a semicircular cross section opened in the upward direction. It is possible to easily enter and exit the billet without any portion where the outer surface of the inner surface and the inner surface of the recessed portion 5-8 are in close contact with each other.

As described above, the present invention enables not only the front end of the billet and the entry and exit of the die easily, but also the device itself can be made simpler and more compact, and the maintenance and the part test can be easily performed. It can be attached to a flat surface, and the attachment area can be relatively narrow, and the equipment cost is very low, which is very useful.

Claims (1)

A set of fixed dies 1, a swing die 2, a movable die 93, and a movable swing die, each of which has a semicircular recess for billet charging, which is arranged on the upper and lower surfaces thereof so as to face each other vertically. 4) Another set of pairs is provided adjacent to each other in the axial direction of the recessed portion, and the movable die 3 and the movable swinging die 4 are integrated so as to slide in the horizontal direction perpendicular to the axial direction of the recessed portion. The die 2 and the movable swing die 4 swing upward and downward with respect to the fixed die 1 and the movable die 3, respectively, about a horizontal axis parallel to the axial direction of the recessed portion. Die opening and closing device 26 between the movable swing die 4 and the guide block 16 for the movable swing die 4 fixed to the swing die 2, and between the fixed die 1 and the swing die 2, respectively. , Billet cutting device (30).

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