EP1201306A1

EP1201306A1 - System for preventing scatter of crush-cut castings for casting crush-cutting apparatus and cutting structure therefor

Info

Publication number: EP1201306A1
Application number: EP00309418A
Authority: EP
Inventors: Yasuaki Okyua
Original assignee: Individual
Current assignee: OKUYA, YASUAKI
Priority date: 2000-10-26
Filing date: 2000-10-26
Publication date: 2002-05-02
Anticipated expiration: 2020-10-26
Also published as: DK1201306T3; EP1201306B1; DE60040467D1

Abstract

A system for crush-cutting castings (W) is formed of two opposed blade-carrying cutters (4,5). The system is adapted to carry out, in accordance with a forward movement of at least one of the cutters (5,4) along an arcuate path, a casting pressing operation by free end portions (52b,42b) of blades (52) of one cutter (5) and those (12) of the other cutter (4) opposed to the first-mentioned cutter (5), and a casting crush-cutting operation between the free end portions of the two blades (52,42) with the resultant crush-cut casting being pressed toward a lower portion of a casting crush cutting apparatus (1).

In accordance with forward movement of at least one cutter (5) along the arcuate path, an operation for pressing the crush cut castings (W1) by the free end portions (52b) of the blades (52) of the same cutter (5) and those (42b) of the blades (42) of the other cutter (4) opposed to the first-mentioned cutter (5), and an operation for crush-cutting the crush cut castings (W1) between the free end portions (52b,42b) of the two cutters (5,4) are carried out whereby the scatter of the crush-cut castings in the upward direction of the casting crush-cutting apparatus (1) is avoided.

Description

BACKGROUND OF THE INVENTION:

Field of the Invention:

This invention relates to a system for preventing the scatter of crush-cut castings for casting crush-cutting apparatuses, and a cutter structure therefor.

Description of the Related Art:

Regarding a casting crush-cutting apparatus and a crush-cutting (crushing) system utilizing this casting crush-cutting apparatus, the applicant of the present invention has filed patent applications in Japan, U. S, A. and Europe. These patent applications include Japanese Patent Laid-Open No. 106083/1994 entitled "HYDRAULIC CRUSHING-BREAKING APPARATUS FOR CASTING WEIRS AND RUNNERS AND IMPERFECT CASTINGS" , Japanese Patent Laid-Open No. 182238/1994 entitled "METHOD OF CRUSHING-BREAKING NON-UNIFORM CASTING WEIRS AND RUNNERS AND IMPERFECT CASTINGS", US Patent Application No. 5, 791, 573 entitled "CRUSHING-BREAKING APPARATUS", and European Patent Application No. 0919283 entitled "AN APPARATUS FOR CRUSHING-BREAKING USELESS CASTING PRODUCTS USING A FIXED AND ROCKING CUTTER DEVICE AND METHOD FOR COATING SAID CUTTING DEVICES.
In the invention disclosed in each of the above literature, surfaces of free end portions of blades have substantially the same surface relation (parallel surface relation) as a blade base surface as seen in a schematic diagram of Fig. 7 showing the moving condition of a movable cutter. Accordingly, when the free end portions of the blades of the movable cutter are in positions (a) (g) of movement thereof in the same drawing with respect to the other cutter, for example, free end portions of blades of a fixed cutter, the free end portions of the movable and fixed cutters are in a substantially V-shaped mutually fitting relation. When castings are crush-cut with the blades in this substantially V-shaped mutually fitting mode, pressing stress of the free end portions of the movable cutter works in an upward direction (direction of an arrow X) of the casting crush-cutting apparatus, it is conceived that castings W or crush cut castings W1 would scatter in the worst case as shown by words "scattering direction" in the drawing. Such a scatter of the casting W or crush-cut casting W1 has a -fear of causing troubles concerning the safety and controlling of a casting crush-cutting operation to occur, which include the occurrence of an accident resulting in injury or death, the occurrence of a cause of a failure of some other machine, the occurrence of necessity of cleaning and recovering work, or a decrease in an operation efficiency.

SUMMARY OF THE INVENTION:

In view of the above, the present invention employs a structure in which the pressing stress referred to above works in a downward direction (direction of an arrow 1X) of a casting crush-cutting apparatus and does not cause castings W or crush cut castings to scatter, and, in which, moreover, the castings W or crush-cut castings W1 are crush cut between free end portions of the blades of movable and fixed cutters as the castings W or crush-cut castings W1 are pressed in a downward direction of the casting crush-cutting apparatus.
When the movable cutter is in a limit position of its rearward movement, castings are thrown into an inlet port formed by the blades (functioning as pressure blades) of the movable cutter and free end portions of the blades of the other cutter (either a fixed cutter or a movable cutter can serve the purpose). The movable cutter is then moved forward along an arcuate path. During this forward movement of the movable cutter, pressure blades moving forward along the arcuate path and receiving blades are put in a mutually fitting relation to carry out a casting crush-cutting operation. Owing to a downward pressing force (pressing stress) produced by the free end portions (blade-bottom inclined surfaces) of the pressure blades and those (blade-bottom inclined surfaces) of the receiving blades, the castings can be moved in a downward direction of the casting crush-cutting apparatus, and. owing to the mutually fitting relation between the free end portions of the pressure blades and those of the receiving blades, the castings are crush-cut reliably. Upper parts of blade bottom surfaces of the free end portions have a projecting shape (scatter of castings-preventing projections) with respect to lower parts of the blade bottom surfaces of the free end portions, and a pressing and/or crush cutting operation is carried out with respect to the castings or crush-cut castings at these scatter of castings preventing projections as main members for effecting this operation. Therefore, the present invention has the following characteristics. The castings or crush-cut castings can be processed safely and effectively (the invention is useful for preventing the castings or crush cut castings from scattering) without accompanying movements of the castings or crush-cut castings in the upward direction of the casting crush-cutting apparatus. The crush cutting of castings or crush-cut castings can be attained, for example, reliably and under a low pressure by concentrating castings or crush cut castings crush cutting force (on the upper parts of the blade bottom surfaces of the free end portions). These casting crush-cutting techniques are serviceable to reduce the dimensions of a cylinder and the casting crush - cutting apparatus as a whole or the running cost.
As the movable cutter thereafter moves forward, the casting pressing and crush-cutting operation by the scatter-preventing projections, and the casting pressing and crush-cutting (shearing) operation by (between) the two sets of blades are carried out.
The crush cut castings are received by lower blades or reach clearances among subsequent blades as the crush-cut castings fall through these clearances. The pressing, crush cutting and falling of these castings are thereafter repeated, and the resultant crush-cut castings are recovered from a discharge port of the casting crush cutting apparatus and put in, for example, a holder below the same apparatus.
The movable cutter employs in some cases a structure formed so that, when a load is imparted to the movable cutter while this cutter is moved, the cutter is once moved back and then moved forward again. After this movable cutter reaches a limit of its forward movement, the cutter is moved back.

BRIEF DESCRIPTION OF THE DRAWINGS:

Fig. 1 is a general perspective view of a crush cutting apparatus used in the present invention;
Fig. 2 is a sectional view of the apparatus of Fig. 1;
Fig. 3 is a perspective view showing a fixed cutter on an enlarged scale;
Fig. 4 is an enlarged sectional view of a principal portion of the apparatus of Fig. 1;
Fig. 5 is an enlarged schematic diagram illustrating the relation between a movable cutter and the fixed cutter, and between a casting and a crush-cut casting;
Fig. 6 is an enlarged schematic diagram illustrating a movement of blades of the movable cutter; and
Fig. 7 is an enlarged schematic diagram illustrating a movement of blades of a related art movable cutter.

DESCRIPTION OF THE PREFERRED EMBODIMENT:

Examples of cutters used in the system according to the present invention will now be described on the basis of the drawings. This crush-cutting apparatus 1 has as main constituent elements an upper and lower sides-opened frame 3 formed by side plates 2a, 2b and a cross plate 2c. a fixed cutter 42 (one cutter) and a movable cutter 5 (the other cutter) which are provided on the frame 3, and a cylinder 6 adapted to move this movable cutter 5 forward and backward.
The fixed cutter 4 is formed of a blade base fixing base plate 40 provided on the frame 3, a blade base 41 detachably provided on the base plate 40. and plural frusto conical blades 42 (functioning as receiving blades or pressure blades) provided in a staggered manner on the blade base 41. Curvilinear inclined surfaces 42a of the frusto-conical blades 4 have such an angle that enables crush cut castings (reutilizable crush cut castings) to fall reliably and naturally. These blades 42 are arranged in a staggered manner, and openings A in which fruslo-conical blades 52 of a movable cutter 5, which will be described later. can be fitted are formed among the blades 42, and crush-cut castings fall through fitting clearances A1. Referring to the drawings, a reference numeral 43 denotes scatter preventing projections provided on free end portions 42b, and each projection 43 is formed so that an upper part 43a of a free end surface of a blade at a free end portion 42b projects with respect to a lower part 43b of the free end surface of the blade at the free end portion 42b.
Each blade 42 is formed so that an imaginary extension line 42b-1 drawn from the free end portion 42b of the blade 42 of the fixed cutter 4 crosses a surface of the blade base 41 at an acute angle B. As a result of the employment of this structure, the following characteristics are obtained. For example, the prevention of the scatter of crush-cut castings W1, the pressing (occurrence of pressing stress C) of the crush-cut castings W1 in the downward direction of the casting crush cutting apparatus and the crush cutting (occurrence of crush-cutting stress D) of the crush cut castings W1 can be attained at once. Moreover, each blade is formed by setting an angle made by a bottom surface 42c of a blade 42 and a surface of the blade base 41 to an angle of depression E (substantially around 70° -90° ). As a result of the employment of this structure, characteristic effects are obtained which include the attainment of a decrease in a frequency in occurrence of the lodging of the castings W and/or crush-cut castings W1 between the bottom surface 42c and blade base 41, and an improvement of a casting crush cutting efficiency.
The movable cutter 5 is formed of a movable plate 50 provided pivotably on the frame 3 via a pivot 7, a blade base 51 provided detachably on the movable plate 50. and plural frusto-conical blades 52 (functioning as pressure blades) provided in a staggered manner on the blade base 51. Curvilinear inclined surfaces 52a of the frusto conical blades 52 have such an angle of inclination that enables the crush-cut castings W1 to fall reliably and naturally. These blades 52 are arranged in a staggered manner, and the frusto conical blades 42 of the above-mentioned fixed cutter 4 arc fitted among the blades 52.
Each blade 52 of the movable cutter 5 is formed so that an imaginary extension line 52b-1 drawn from a free end portion 52b thereof crosses a surface of the blade base 51 at an acute angle B . As a result of the employment of this structure, the following characteristics are obtained. For example, the prevention of the scatter of crush cut castings W1, the pressing of the crush-cut-castings W in the downward direction of the casting crush-cutting apparatus and the crush-cutting of the crush-cut castings W1 can be attained simultaneously. The movable cuuter 5 is moved and back via the expansion and contraction of a piston rod 61 of the cylinder 6, with a pivot 7 acting as a spindle. Since the blades 52 of the movable cutter are engaged with and disengaged from those 42 of the fixed cutter with the piston rod 61 connected pivotably to an upper portion of the movable plate 50. the pivot 7 (fulcrum) and the upper portion to which the piston rod 61 is pivotably connected of the movable plate form a lever and fulcrum mechanism, a pressure generated by which is applied to the movable plate 50. Referring to the drawings, a reference numeral 53 denotes scatter preventing projections provided on free end portions 52b, and each of the projections 53 is formed so that an upper part 53a of a free end blade surface at the free end portion 52b projects with respect to a lower part 53b of the free end blade surface at the free end portion 52b. Moreover, each blade is formed by setting an angle made by a bottom surface 52c of the blade 52 and blade base 51 to an angle of depression E (substantially around 70° 90° ). As a result of the employment of this structure, characteristic effects are obtained which include the attainment of a decrease in a frequency in occurrence of the lodging of the castings W and/or crush cut castings W1 between the bottom surface 52c and blade base 51. and an improvement of a casting crush-cutting efficiency.
The operating condition of the fixed cutter 4 and movable cutter 5 will now be described, Between opposed surfaces of the blade base 41 of the fixed cutter 4 and the blade base 51 of the movable cutter 5, a V-shaped inlet port 100 is formed, which is adapted to be contracted or expanded after castings W (cast products and imperfect cast products) are thrown thereinto. The castings W or crush-cut castings W1 are crush -cut with the prevention of the scatter of the same attained at the same time, by utilizing a movement of the movable cutter 4, an operation for crush cutting the castings W based on the mutually fitting relation between the frusto-conical blades 52 of the movable cutter 5 and those 42 of the fixed cutter 4, and a downward pressing force of the free end portions 52b of the blades 52 and those 42b of the blades 42. To be concrete, a crush cutting stress D and a pressing stress C are exerted on the castings.
The crush-cut castings W1 are guided to a discharge port 200 of the casting crush-cutting apparatus via these operations, and discharged from the discharge port 200 to the outside of the casting crush cutting apparatus.
The present invention is formed so that an imaginary extension line drawn from the free end portion of each of the blades provided on the movable and fixed cutters crosses the relative blade base surface at an acute angle, in which castings or crush-cut castings are crush-cut with the prevention of the scatter of the same attained at the same time. by utilizing an operation for crush-cutting the castings based on the mutually fitting relation between the frusto conical blades of the movable cutter and those of the fixed cutter, and a pressing force generated by the free end portions of the blades and working in the downward direction of the casting crush cutting apparatus. This enables the scatter of castings or crush cut castings to be prevented; a casting crush cutting operation to be carried out reliably and efficiently by utilizing the casting or crush cut casting pressing stress working in the downward direction of the casting crush-cutting apparatus and a crush cutting stress at the same time; and crush-cut castings optimumly applied to a furnace and reliable and efficient regenerated crush cut castings to be provided.
The present invention is formed so that an imaginary extension line drawn from the free end portion of each of the blades provided on the movable and fixed cutters crosses the relative blade surface at an acute angle. Accordingly, the invention has the following characteristics. The pressing stress mentioned above is exerted on a lower portion of the casting crush-cutting apparatus, and this serves to prevent the scatter of the castings or crush cut castings. and enables the castings or crush-cut castings to be crush-cut as the castings or crush-cut castings are pressed in the downward direction of the casting crush-cutting apparatus between the free end portions of the blades of the movable and fixed cutters.

DESCRIPTION OF THE REFERENCE NUMERALS AND LETTERS:

FIG. 1: 1... CRUCH-CUTTING APPARATUS, 2A... SIDE PLATE, 2B... SIDE PLATE, 2C... CROSS PLATE, 3... FRAME, 6... CYLINDER, 61... PISTON ROD, 100... INLET PORT.
FIG. 2: 4...FIXED CUTTER, 5... MOVABLE CUTTER, 7... PICOT, 40... BASE PLATE, 41...BLADE BASE, 42... BLADE, 42A... INCLINED SURFACE, 43... SCATTER PREVENTING PROJECTIONS, 50... MOVABLE PLATE. 51... BLADE BASE, 52...BLADE, 52A... INCLINED SURFACE, 53...SCATTER PREVENTING PROJECTIONS, 200... DISCHARGE PORT.
FIG. 3; 42B... FREE END PORTION. 428-1... IMAGINARY EXTENSION LINES, 52B... FREE END PORTION, 52B-1... IMAGINARY EXTENSION LINES. B... ACUTE ANGLE, B' ... ACUTE ANGLE.
FIG. 4: 42C... BOTTOM SURFACE, 43A... UPPER PART, 43B... LOWER PART, 52C, .. BOTTOM SURFACE, 53A... UPPER PART, 53B... LOWER PART, C... PRESSING STRESS, D... CRUSH-CUTTING STRESS, E... ANGLE OF DEPRESSION, E'...ANGLE OF DEPRESSION.
FIG. 5: A... OPENINGS, A1...CLEARANCE.
FIG. 6: W... CASTING, W1... CRUSH-CUT CASTING.
FIG. 7: 1... X DIRECTION, 2... SCATTERING DIRECTION, 3... V SHSPED MUTUALLY FITTED PORTIONS.

Claims

A system for preventing the scatter of crush-cut castings for casting crush-cutting apparatuses, comprising:

a system for crush-cutting castings(W) formed of two opposed blade -carrying cutters (4, 5),

the system being adapted to carry out, in accordance with a forward movement of at least one of the cutters(5, 4) along an arcuate path, a casting pressing operation by free end portions(52b, 42b) of blades(52) of one cutter(5) and those (12) of the other cutter 4 opposed to the first-mentioned cutter(5), and a casting crush-cutting operation between the free end portions of the two blades (52, 42),

the resultant crush-cut castings being pressed toward a lower portion of a casting crush cutting apparatus (1),

in accordance with a forward movement of at least one cutter (5) along the arcuate path, an operation for pressing the crush cut castings (W1) by the free end portions(52b) of the blades(52)of the same cutter(5) and those(42b) of the blades(42) of the other cutter(4) opposed to the first-mentioned cutter(5), and an operation for crush-cutting the crush cut castings(W1) between the free end portions(52b, 42b) of the two cutters (5, 4)being carried out, whereby:

the scatter of the crush-cut castings in the upward direction of the casting crush-cutting apparatus(1)is avoided.
A cutter structure used in the system for preventing the scatter of crush-cut castings(W)for casting crush cutting apparatuses defined in Claim 1. comprising:

cutters (4, 5)formed so that an imaginary extension lines(42b 1, 52b-1) of free end portions(42b, 52b) of blades (42, 52) thereof cross relative blade base surfaces at an acute angle.
Apparatus for crush-cutting castings, the apparatus having first and second blade members and means for effecting relative movement between the blade members along an arcuate path to bring the blade members together to cause blades of the first and second blade members to cooperate to perform crush-cutting, such that crush-cut castings are caused to move downwardly to inhibit scatter.
Apparatus according to claim 3, wherein the blades carry scatter preventing projections.
A blade member for use in an apparatus according to claim 3, wherein the blades carry scatter preventing projections.