JPH0557423A - Method and apparatus for cutting sprue in work - Google Patents

Abstract

PURPOSE:To efficiently cut off plural sprues and to repeatedly use pallets while circulating by using plural pallets. CONSTITUTION:The work W after casting, is laid while projecting the sprue WS on the pallet 2. Plural pallets 2 are shifted to unidirection with an annular carrying passage 3. On the carrying passage 3, a damping 6 containing air, is arranged and at the side part, an endless cutter 4 is arranged. In front of the damper 6, a belt 8 with teeth is arranged and the pallets 2 are carried to the endless cutter 4 at the constant feeding speed. The damper 6 is driven- rotated at the feeding speed while contacting with upper face of the work W, and the sprue WS is cut off with the endless cutter 4 while holding the work W to the pallet 2 without any backlash.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for cutting off a sprue portion protruding from a work after casting.

[0002]

2. Description of the Related Art The sprue portion protruding from a work after casting is cut by a sprue cutter conventionally called a sprue cutter. In this gate cutter, a work is placed and fixed on a pallet whose table surface reciprocates by a cylinder device, and while gradually moving from the setup position to the processing position, the base of the gate protruding from the pallet is moved. Is applied to a rotating band saw (hereinafter referred to as an endless cutter) and cut off.

[0003]

In such a structure, since one pallet is reciprocally moved to perform one step, the number of gates to be machined by one gate is extremely limited.
If you want to cut the gate according to the casting speed, you have to put in a large number of gate cutting machines. Moreover, while the work was on the pallet, it was inefficient that even the next setup could not be performed.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a work sprue cutting method and device for efficiently carrying out sprue cutting work by circulating and conveying a plurality of pallets in a conveying path.

[0005]

In order to achieve the above-mentioned object, in the method of the first invention, the movement of the pallet on which the work after casting is placed is guided by an annular conveying path to move the pallet. While continuously feeding to the cutter along the transport path, the sprue protruding into the work is separated by the cutter.

According to the second aspect of the present invention, a cast and formed work piece is used.
A work sprue cutting device is configured by a pallet on which a work is placed, an annular transfer path that continuously guides the movement of the pallet, and a cutter disposed in the transfer path.

[0007]

The work on the pallet is continuously moved in one direction on the conveying path, is fed to the cutter, and the gate is cut off. The pallet makes one round by going around the transport path.
A setup station is set in a part of the transport path, and the work is attached and detached at the setup station.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

The sprue cutting device 1 includes an annular conveying path 3 for guiding the movement of a plurality of pallets 2, a sprue cutting mechanism 5 having an endless cutter 4, and a damper 6 for holding a work W when the sprue is cut off. It has and.

On the upper surface of the pallet 2, a concave groove 2a is formed in the shape of a work W, and in the center of the lower surface, a rack 2b is formed in the longitudinal direction. Yukata WS
Project from the side of the pallet 2 to the inside of the transport path 3,
It is placed in the groove 2a.

The transport path 3 includes a pair of parallel vertical paths 3a, 3a.
It is a rectangular circuit circuit in which both ends of b are connected by lateral paths 3c and 3d. The feed roller 7 is provided in the transport path 3.
And a toothed belt 8 and lateral feed levers 9, 9 and a vertical feed lever 10. The pallet 2 is provided with the feed roller 7, the toothed belt 8, the lateral feed lever 9,
By the 9 and the vertical feed lever 10, the inner and outer guide rails 11a and 11b are circulated and conveyed in the clockwise direction in FIG. 1, and one round of the conveying path 3 is completed to complete one gate cutting process.

The feed roller 7 is constructed by randomly arranging a driving roller 7a and a driven roller 7b, while allowing the pallet 2 to slide on both vertical paths 3a and 3b. Carry. Further, the toothed belt 8 is wound around the drive sprocket 12 and the driven sprocket 13 at the center in front of the endless cutter 4 and the damper 6, and from the motor 14 to the drive gear 15 → chain 16 → driven gear 17 → Axis 18
By the driving force transmitted to the drive spcket 12 through the through, it rotates in the clockwise direction in FIG. 4 and meshes with the rack 2b of the pallet 2 conveyed to the upper part, and conveys the pallet 2 to the endless cutter 4 at a constant speed. A plurality of spherical rolling elements 19 are juxtaposed on both sides of the toothed belt 8 so that the contact area with the pallet 2 conveyed by the toothed belt 8 can be kept small and the pallet 2 can be moved smoothly. I have to.

Sensors 20a, 20b, 20c and 20d are provided at the start and end of the vertical paths 3a and 3b, and detect the pallet 2 which has been conveyed through the vertical paths 3a and 3b. Among them, the sensors 20a to 20c other than the sensor 20d provided at the start end of the vertical path 3a operate the horizontal and vertical feed levers 9, 9 and 10 by a drive device (not shown) to move the pallet 2 to the next position. To the route.

The horizontal feed lever 9 is provided at each end of the vertical paths 3a and 3b, and horizontally feeds the pallet 2 from the end of one vertical path to the start of the other vertical path. Further, the vertical feed lever 10 is located at the start end of the vertical path 3b (the lower right end in FIG. 1), and the pallet 2 which has been horizontally fed through the horizontal path 3c by the horizontal feed lever 9 is vertically fed by one pallet. Therefore, the pallet 2 delivered to the end of the vertical path 3a on the gate cut-off side can be laterally fed to the start end of the vertical path 3b at any time. The levers 9, 9 and 10 that have completed the horizontal and vertical feeding of the pallet 2 return to the initial position shown in FIG. 1 in a short time and wait for the arrival of the next pallet 2.

The endless cutter 4 is arranged behind the toothed belt 8 at a position where the inner guide rail 11a is cut out, and is moved upward by a drive and power transmission device provided in the main body of the sprue cutting mechanism 5. The gate WS is cut from the work W which moves downward from the vertical path 3a and continuously moves along the vertical path 3a. The damper 6 is supported inside the endless cutter 4 at an upper rear position of the toothed belt 8 by an L-shaped arm 21. The damper 6 is a pneumatic tire made of rubber, and when the gate WS is cut off by the endless cutter 4, the damper 6 is driven to rotate at the feed speed while being in contact with the work W on the pallet 2 to rotate the bullet 2. While assisting the feeding, the work W is pressed against the pallet 2 without rattling so that the gate WS can be accurately cut off from a predetermined position.

The arm 21 is pivotally supported by the sprue cutting device 5 in the vicinity of the bent portion, the damper 6 is held at the side end, and the arm 21 and the damper 6 are provided at the upper end as shown in FIG. A set spring 22 that biases clockwise is provided. The urging force of the set spring 22 is adjusted by the adjusting screw 23.
The damper 6 can be raised or lowered according to the shape of the work W, and is normally set to such a degree that the damper 6 can be brought into light contact with the work W and driven.

In addition, a work W is provided on the conveying path 3 with a pallet 2
The setup station to be attached to or removed from is determined at one place other than the sprue cut-off point.
A work W is placed on the pallet 2 reaching the toothed belt 8.

Next, the operation of the present embodiment thus constructed will be described.

When performing the sprue cutting operation with the present device 1,
The endless cutter 4, the feed roller 7, and the toothed belt 8 are rotating, and the damper 6 does not rotate unless the pallet 2 with the work W placed below reaches. In addition, the pallet 2 of this embodiment has three recessed grooves 2a each, and these recessed grooves 2a are worked by a setup station.
Ku W is assembled.

The pallet 2 on which the work W is placed is the rack 2
The meshing of b with the toothed belt 8 allows the vertical path 3a to be fed in the direction of the endless cutter 4 at a constant feed speed. Next, the top surface of the first work W contacts the damper 6 and the work W
While being held by the pallet 2, the endless cutter 4 cuts off the sprue WS from its base by the movement of the pallet 2 while the driven rotation starts at the feeding speed. Damper 6
The work is suppressed by the work continuously from the start to the end of the cutting work, and when the gate WS is cut off from one work W, it moves to the next work W and is driven. Hold the work W while rotating.

In this way, the pallet 2 from which the gate WS has been cut off from all the works W placed in the concave groove 2a is delivered to the end of the vertical path 3a by the feed roller 7. At the end of the vertical path 3a, the sensor 20a detects the payout of the pallet 2 and activates the lateral feed lever 9 to convey the pallet 2 to the starting end of the other vertical path 3b. Even at the beginning of the vertical path 3b, the sensor 20b detects the arrival of the pallet 2 and operates the vertical feed lever 10 to vertically feed the pallet 2 by one pallet. The vertically fed pallet 2 is fed to the end of the vertical path 3b by the feed roller 7.

At the end of the vertical path 3b, the sensor 20c detects the arrival of the pallet 2, but at the same time, the sensor 20d detects whether or not the pallet 2 is present at the starting end of the vertical path 3a, and the pallet 2 is present. In this case, the pallet 2 on the vertical path 3b is not fed horizontally. When the sensor 20d detects a vacancy at the starting end of the vertical path 3a, the sensor 20c operates the lateral feed lever 9 to move the pallet 2 to the vertical path 3a.
Transport to the beginning. The pallet 2 laterally fed to the starting end of the vertical path 3a is loaded with the work W in the concave groove 2a and is fed to the toothed belt 8 by the feed roller 7.

In this embodiment, the ring-shaped conveying path 3 is thus formed.
Moreover, since the plurality of pallets 2 are continuously moved, a large number of gates WS can be cut off in a short time. Further, since the pallets 2 can be circulated in the transport path 3 and repeatedly used, the efficiency is good. Further, the work W can be set up during the sprue cutting operation without disturbing the work.

The pneumatic damper 6 is attached to the pallet 2
Since the sprue WS is cut off while being driven and rotated by the movement, the damper 6 can hold the work W against the pallet 2 without rattling, and the sprue WS can be accurately cut from a predetermined position.

In the above-mentioned embodiment, the pneumatic damper is used together to suppress the rattling of the work, but the present invention changes the shape of the pallet or the groove on the pallet, Since the work can be fixed, the damper can be omitted. In addition, other power transmission devices such as chains, gears, and wrapping belts may be used in the transport path, or the pallet may be self-propelled.

[0026]

According to the present invention, since a plurality of pallets are continuously conveyed to the cutter using the annular conveying path,
A large number of gates can be cut off in a short time. Moreover, by circulating these pallets in the transport path, it is possible to use them without waste. Also, during the work of cutting the sprue,
Work can be set up at other places on the transport path, which is efficient.

[Brief description of drawings]

FIG. 1 is a plan view of a gate opening device showing 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 the line III-III in FIG.

FIG. 4 is a sectional view taken along the line IV-IV in FIG.

[Explanation of symbols]

1 ... Gate cutting device, 2 ... Pallet, 2a ... Recessed groove, 2b ...
Rack, 3 ... Transport path, 3a, 3b ... Vertical path, 3c, 3d
... lateral path, 4 ... endless cutter, 5 ... gate cutting mechanism,
6 ... Pneumatic damper, 7 ... Feed roller, 8 ... Toothed belt, 9 ... Horizontal feed lever, 10 ... Longitudinal feed lever, 11a,
11b ... Guide rail, 12 ... Drive sprocket, 13
... driven sprocket, 19 ... spherical rolling element, 20a-20
d ... sensor, 21 ... arm, 22 ... set spring,
23 ... Adjusting screw, W ... work, WS ... gate

Claims (2)

[Claims] 1. A movement of a pallet on which a cast work is placed is guided by an annular transport path, and the pallet is continuously fed to a cutter through the transport path while projecting to the work. A work sprue cutting method that separates the sprue with a cutter. 2. A pallet on which a cast-molded work is placed, an annular conveying path for continuously guiding the movement of the pallet, and a cutter arranged in the conveying path. Ku sprue cutting device.