JPS58187257A - Cutter for fin - Google Patents

Abstract

PURPOSE:To enable the thorough cutting of fins from the root part with one stroke of cutting blades, by providing the cutting blades movably into and out from a product and bringing the cutting blades into contact with the surface of the product by a driving means. CONSTITUTION:While a movable cutting blade 22 is held retreated, a top mold holder 10 is brought downward to press a pad 12 to a cylinder block 8 which is a product to move cutting blades 17, 21, 22 respectively near fins 8a, 8b, in the stage of cutting the fins 8a, 8b. As the holder 10 is brought downward continuously, the blade 21 cuts the vertical fin part of the fin 8b. When the holder 10 is brought further downward, a dog 30 actuates a limit switch 31, and a solenoid valve 32 changes over to advance the piston rod 27a of a cylinder 27 thereby bringing the blade 22 into contact with the side surface of the block 8. The blade 17 contacts the fin 8a upon contact with the cutting blade with the root part of the fin 8b and cuts the fins 8a, 8b when the blade is brought downward further.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flash cutting device that can almost completely remove flash generated during casting.

When casting a cast product, such as a cylinder block, the core and other parts are omitted for simplicity's sake! 1
[As is clear from the mold sectional view M, the lower mold part 1 defines the lower surface of the cylinder block, the @ mold part 28 defines both sides of the cylinder block, and the upper mold part defines part of the upper surface and side surfaces. 8 to constitute the mold 4.

Therefore, when a cylinder block is cast using such a mold number, the cylinder Blocks are formed, each with a horizontally protruding casting opening (corresponding to a in the illustrated example) and an L-shaped casting opening (corresponding to b in the illustration). □ Of these flashes, those that are completely removed together with the cylinder block part in the next machining process (corresponding to a in the illustrated example) are treated with a special treatment for the purpose of increasing the life of the cutter during machining. Since it is sufficient to perform rough deburring, for example, by removing 1.0 to 1.5 m5 IPU of the base of the cast flash, no interlayer will be formed. However, if flash occurs in a portion that is not subjected to mechanical machining (corresponding to b in the illustrated example), it is necessary to cut the tube almost completely from its base.

Therefore, a device as shown in FIG. 8, for example, has been proposed as a device for efficiently removing all of such flash.

In this example, the punch 7 is placed on the bolster 6 inside the boss) 5.
and to position the cylinder block 8 on one side of the cast product on this punch 7,
An upper mold holder 10tt, which has a generally cylindrical shape as a whole, is fixed to a slide 9 that can be raised and lowered at the top of the post, and a pad is arranged inside this upper mold holder 10 to be slidable in the vertical direction via a wear plate 11. A spring of 1 m is inserted between the upper die holder 10 and the pad 18] δ
The pad retainer 14 is biased downward by the pad retainer 14, and the long groove ISl& provided therein is engaged with the tip of the pad retainer 14, which is passed horizontally through the side wall of the upper mold holder 0. Furthermore, a sectional die 1b- is fixed to the lower end of the upper mold holder 10, and two fixed cutting blades 1 are provided on the inner surface of the sectional die 15, as shown in FIG.
6. Attach 17.

In FIG. 8, 18 indicates a nest attached to the punch 7 to position the cylinder block 8, and 19 indicates a scrap chute provided on the side of the punch 7.

The action of such a conventional device is first punch? This is done by placing the cylinder block 8 on top and then operating the slide 9 to lower the upper mold holder 10.

Here, the lowering of the upper die holder 10 first brings about the contact between the pad 1m held at the center thereof and the cylinder block 8, and then the pad 1m is brought into contact with the cylinder block 8 by the spring lδ.
This causes pressure on the cylinder block 8. The flywheels of the upper mold holder 10 bring each of the fixed cutting blades 16.17 attached to the sectional tie IIS into the respective casting flash, and these fixed cutting blades 16.17 are attached to the upper mold nelder 10. Cut each of the above-mentioned casting beams near the lower limit position.

FIG. 8 is an enlarged sectional view of the main part showing the shape of the cast flash after cutting, and the cast flash, which has been roughly cut by the fixed cutting blade 17 provided on the lower side, is generally placed in the scrap chute.] Fall to 9. On the other hand, the scraps that have been cut with relatively high precision by the fixed cutting blade 16 provided on the upper side are removed from the scrap chute 19 between the cylinder block 8 and the fixed cutting blade 17 as the upper mold holder 10 begins to rise. fall to.

Also, in this raising process of the upper die holder]0, the pad retainer 14 is moved to the pad 1! The upper die holder 10 and the sectional die 1! i rises relative to the pad 1s and the fixed cutting blade 16,1? Both are separated above the cylinder block 8.

The subsequent upward movement of the upper mold holder 10 becomes integral with the pad 1m, and when it reaches the upper limit position, the flash cutting operation is completed.

However, since cast products such as the cylinder block 8 generally have a dimensional difference of 2.0 to 3.0 cm, it is necessary to position the cutting blade in this way in order to completely remove the cast metal. However, since the conventional device described above uses a fixed cutting blade 16.17, it is especially difficult to remove flash when precision is required. In some areas, there was a diencephalon where uncut flash or product scraping occurred.

This invention advantageously solves the problem of the conventional technique.In particular, a movable cutting blade is provided adjacent to the rear side of the fixed cutting blade attached to the sectional tie, and this movable cutting blade is The blade can move forward and backward relative to the product on the punch, and is connected to a straightening drive means, and after the fixed cutting blade roughly cuts the cast flash of the product by the operation of the sectional die, the drive means performs zero-motion cutting. To provide a cast flash cutting device which completely cuts off the remainder of the cast flash with a movable cutting blade by bringing a blade into contact with a product surface and based on the subsequent operation of a sectional tie.

The present invention will now be explained based on illustrated examples.

@ Figure 4 is an enlarged sectional view of the inspector showing an embodiment of the present invention, and the parts other than those shown are the same as those described with respect to Figure 2, so the explanation is omitted here, and the corresponding parts are
Indicated by fF+1 number.

In the figure, sa and sb are the joint between the lower mold part] and the side mold part 2, and the joint between the side mold part 8 and the upper mold part 8.
This shows a flash generated in the cylinder block 8 at the seam where the flash 8a can be cut with rough precision, while the flash 8b needs to be cut with high precision.

Therefore, in this example, a fixed cutting blade 1f for the flash 8a is provided at the lower end of the sectional die 1b, as described with reference to FIGS. A fixed cutting blade 2] is provided, and a movable cutting blade 3s that can move horizontally forward and backward with respect to the pad 1g and, in turn, the cylinder block 8, is provided on the rear side in the working direction of the fixed cutting blade 21, in other words, on the upper side.

Here, the amount of protrusion of the fixed cutting blade 17 from the sectional die 16 is preferably determined so that its cutting edge is located directly above the base end of the flash 8a;
Since this part where the flash 8a is generated will be cut horizontally by later machining, a slight deviation in the cutting line position is allowed as long as it does not adversely affect the cutter for machining or the cylinder block 8. Ru. Furthermore, the amount of protrusion of the fixed cutting blade jll for rough cutting is such that the cutting edge of the movable cutting blade s2 has a cast finish 8b in order to assist the action described later of the movable cutting blade s2.
It must be located closer to the cylinder block than at least the vertical burr of the cylinder.

Movable cutting blade! 8 can move horizontally with respect to the cylinder block 8 by making the insert holder 38 integrally connected to the rear end move forward and backward in the hole s4 provided in the sectional die b. can. In order to ensure that the insert holder 18 moves forward and backward smoothly and reliably, the sectional die 1 is
The insert holder 28 is made to be slidable on the wear plate 2b fixed to the flange part b, and is held by a keeper i6 also fixed to the 7 rung part. Plus, a movable cutting blade! In order to control the forward and backward movement of 2,
A platen 10a extending vertically downward from the lower end of the upper mold holder 10 is provided, and the piston rod 27a of the cylinder 37 fixed thereto is connected to the rear end of the insert holder 28 through a hole provided in the bracket 10a.

The control device for the cylinder 37 is as follows.

A dog 80 is fixed to the upper die holder 10, and a limit switch 81 is attached to the post 5. The signal from this limit switch 8 is input to a solenoid valve 8s. When the solenoid valve 82 is located at position 113i & on the left side in the figure, it is a screw)
The computer is retracted.

The operation of the device configured in this way will be explained below.

When cutting the cast flash Qa, gb, by lowering the upper mold holder IO with the movable cutting blade 22 in the retracted state,
As described in connection with FIG. 2, the pad 11 is pressed against the cylinder block 8, and the cutting blades 1f and 91.22 are inserted into the respective flashes 8a.

Approach φ8b. FIG. 1 shows that the fixed cutting blade 21 for rough cutting or the flash 8b is cut by the continuous lowering of the upper die holder 10.
It is a T#111 diagram showing a state in which it has reached the vicinity of the vertical part, and 'the fixed cutting blade 1f is lowered further than this.
The vertical flash portion of the casting beam 8b is cut. The cut vertical burrs then fall into the scrap chute 19.

FIG. 3 is a sectional view showing the upper mold holder 10 in a further descending state, and as shown in the figure, the tip surface sea of the movable cutting blade ms and the vertical portion are cut and exposed. When the side surface 8C of the cylinder block near the base of the cast flash 8b faces each other, the dog 80 provided on the upper mold holder 10 operates the limit switch 81 provided on the first stroke, so that the solenoid valve 8s is activated. Switch to right position tasb and piston rod 1 of cylinder 17
7& to bring the tip end surface 21a& into contact with the cylinder block side surface 8C. Therefore, the subsequent lowering of the upper die holder 10 causes the movable cutting blade 1m to slide against the cylinder block side surface 8o, and brings its cutting edge into contact with the base end of the cast flash.

In this example, the distance between the fixed cutting blade 1f and the movable cutting blade 22 is determined such that when the cutting edge of the movable cutting blade 32 reaches the base end of the flash 8b as shown in FIG. 17 are also selected to reach the proximal end of the flash 8a, so that these two cutting edges 17. As the i9g continues to descend, the flash 8a8b, especially the flash 8b, is completely removed from its base end almost simultaneously. The cast metal 8a cut out here is immediately transferred to the scrap chute 19.

After the cutting blades 17 and 21.2s have finished cutting the flashes 8a and 8b, for example, the seventh
As shown in the figure, the cutting blade 17. In a state where the cutting edge of l11 is slightly lower than the position where flashes 8a and 8b are generated, a limit switch 81 (not shown) provided on boss b)
The operation is completed by activating the movable cutting blade 22 to retract the movable cutting blade 22, and reversing the operation of the slide 9 to raise the upper mold holder 10 and the cutting blade 17°21.28.

The cast flash base cut by the movable cutting blade 22 falls into the scrap chute 19 during this upward movement.

According to this operation of the flash cutting device, apart from the flash 8a which does not require high cutting precision, the flash 8b is cut by the movable cutting blade 23 that always reliably contacts the sound surface of the cylinder block 8. Since it is completely cut off from the base end, there is no risk of the flash 8b being cut or the cylinder block 8 being scraped off.

Note that if the casting flash 8b does not have a vertical flash portion, the cutting blade s1 is not necessarily necessary and may be omitted.

Therefore, according to this invention, the flash can be completely removed from the base end in one stroke of the cutting blade, so there is no need to remove the uncut flash as in the conventional technique. In addition, it is possible to advantageously solve problems such as a decrease in strength of the cast product due to scraping.

[Brief explanation of drawings]

1st is a sectional view of the casting mold to explain the occurrence of casting burns, 2nd figure is a partial sectional view showing a conventional example, 8th is an enlarged sectional view of the main part of 2nd figure, 4th The figure is an enlarged sectional view of a main part showing an embodiment of the present invention, and FIGS. 1s to 7 are enlarged sectional views showing the operating state of the device shown in FIG. 4. 7... Punch 8... Cylinder block 8G... Cylinder block side 10... Upper mold holder 18... Pad 1b...
・Sexy Sonardai 21...Fixed cutting blade 211...Movable cutting blade g
ga... Tip surface 28... Insert holder 27... Cylinder Figure 2 Figure 8

Claims (1)

[Claims] L A punch to which the product is attached, a + comb tie that moves up and down along the surface of the product on the punch, and a cutting blade provided on the sectional die are used to attach the cutting blade to the product ( 7. A casting cutting device characterized in that the cutting blade is provided so as to be movable back and forth, and is provided with driving means for the cutting blade, and the cutting blade is brought into contact with the surface of the product and cuts the burr from the base.