JP2714902B2 - Trimming press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a function of removing a surplus material such as a flash or a solidified product in a runner of a product cast by a die casting machine or the like. More specifically, the present invention has a function of removing a mandrel for holding a sand core. It relates to a trimming press.

[0002]

2. Description of the Related Art Generally, when an engine block or the like is cast by a die casting machine or the like, burrs may come out from a joint surface between an upper mold and a lower mold, or solidification in a runner or a gate which is a passage of molten metal. A trimming press for removing these surplus materials is provided because an object is removed from the cast product. The trimming press includes upper and lower fixed plates connected at four corners by tie rods, and a movable plate located between the upper and lower fixed plates and moving up and down along the tie rods by a hydraulic cylinder or the like on the upper fixed plate side. An upper trimming die and a lower trimming die are fixed to the movable platen and the lower fixed platen, respectively. With this configuration, when the cast product is placed on the lower trimming die by being conveyed by a robot or the like, the upper trimming die is lowered, so that excess materials such as cast beams are removed by shearing. Is done.

On the other hand, in casting such an engine block or the like, a space serving as a jacket for circulating cooling water must be provided around the cylinder portion of the product. The sand core is provided, and after casting, the sand core is disintegrated and taken out of the mold, thereby forming a space portion serving as a jacket in the solidified product. A cylindrical mandrel for holding the sand core is suspended from an upper die of a die casting machine.

Since the mandrel is taken out of the mold while being attached to the product, a mandrel removal press for removing the mandrel from the product is conventionally provided. This mandrel extraction press has an upper die fixed to a movable plate similar to a trimming press having a mandrel extraction jig, and a lower die fixed to a fixed plate, and is cast by a die casting machine. The product removed from the mold is
After the trimming is completed, the mandrel is placed on the lower die of the mandrel pulling press by being conveyed by a robot or the like, and the upper die of the mandrel is lowered, so that the mandrel is pulled out of the product by the mandrel pulling jig. Collected.

[0005]

However, in such a conventional trimming press, since the mandrel punching press is provided separately from the trimming press as described above, the structure is complicated, the number of parts is large, and the equipment cost is high. And the space occupied by the device is increased.
There is a problem that the number of casting cycles is extended.

The present invention has been made in view of the above points, and has as its object to provide a trimming press having a function of removing a mandrel.

[0007]

In order to achieve the above object, according to the present invention, a surplus attached to a casting is placed by placing a casting on a trimming lower die and lowering the trimming upper die together with a movable platen. In the trimming press for removing the material, a mandrel extraction upper die provided with a mandrel extraction jig, and a mandrel extraction lower die on which a casting is placed are provided, and these mandrel extraction upper die and mandrel extraction lower die, In place of the upper trimming mold and the lower trimming mold, a driving device is provided for moving the trimming mold so as to face the inside of the machine, and a spring member for buffering a press load is interposed between the mandrel-pulling lower mold entering the machine and the machine body side. Dressed.

[0008]

[Function] When the upper trimming die and the lower trimming die on which the casting is placed are opposed to each other and the upper trimming die is lowered,
Excess materials such as flashes and runners attached to the casting are removed. Next, the mandrel removal upper die and the mandrel removal lower die are moved by the driving device so as to face each other, and the mandrel removal upper die is lowered. Then, the mandrel is removed and collected by the mandrel removal jig. When removing the mandrel, the press load is buffered by the spring member and does not act on the machine body side.

[0009]

1 to 4 show an embodiment of a trimming press according to the present invention. FIG. 1 is a front view, FIG. 2 is a side view of the same main part, and FIG. 3 is a plan view of the same main part. 4 is a longitudinal sectional view of the cast product before the mandrel is pulled out. In the figure, a trimming press 1 has a lower fixing plate 2 formed of a vertical member 2a and a horizontal member 2b connecting the upper end thereof and standing upright in a pit below a floor surface, and nuts at four corners thereof. An upper fixed platen 5 is fixed with a nut 6 to the upper end of the tie rod 4 fixed and erected at 3. 7
Is a movable plate positioned between the upper and lower fixed plates 2 and 5 and slidably supported by the tie rods 4, and is fixed to a piston rod 9 of a mold clamping cylinder 8 fixed to the upper fixed plate 5. , Which are driven by the mold clamping cylinder 8 to move up and down.

A trimming upper die 10 is fixed to the lower surface of the upper fixed platen 5, and two rails 12, 13 are provided on a base 11 extending on the floor. On these rails 12 and 13, a trimming lower die 15 and a mandrel-pulling lower die 16 connected by a connection fitting 14 are provided by rollingly engaging wheels 17 and 18, respectively. A triangular support frame 20 for supporting the base 11 in the pit is provided before and after the horizontal member 2b of the lower fixed board 2, and a U-shaped support supported on the vertical member 2a side of the lower fixed board 2 and the floor surface. The frame 21 is provided at the same height as the horizontal member 2b.

A hydraulic cylinder 23 as a fluid pressure cylinder is pivotally supported by a bracket 22 on a support frame 21. The working end of a piston rod 24 is connected to the connecting fitting 1
4 is fixed. When the piston rod 24 is moved forward and backward in this manner, the lower trimming die 15 and the lower mandrel removing die 16 advance and retreat between a position shown by a solid line and a position shown by a chain line, and the trimming lower die 15 and the mandrel removing lower die are moved. 16 is configured to selectively enter below the upper trimming die 10.

Here, the cast product will be described with reference to FIG. The casting 50 is a cavity 2 surrounded by an upper die 26 and a lower die 27 of a die casting machine and a slide core 28.
9 is formed by solidifying the molten metal injected into the cavity 9, and a cylindrical cylinder liner 30 is provided with a flanged cylindrical mandrel 31 at the center of the cavity 29.
Is fitted. Disintegrable cylindrical sand core 32
Is located outside the cylinder liner 30 and the mandrel 3
It is held by one flange. By doing so, after the molten metal is injected and solidified, the mold is opened, and the sand core 32 is collapsed and taken out from the mold 26, so that a part of the solidified product forms a space serving as a cooling jacket. It is configured as follows. Then, the mandrel 31 is removed from the mold by the structure described below.

That is, a pipe 33 having a flange at one end fixed to the movable platen 7 is slidably fitted to two front sides of the four tie rods. A pair of guides 34 slidably fitted to the tie rods 4 are integrally fixed to the flange. Thus, when the piston rod 9 of the mold clamping cylinder 8 advances and retreats, the movable platen 7 integrated with the pipe 33 and the guide 34 advance and retreat integrally.

A pair of guides 34 is provided with a plurality of hanging mandrel removing jigs 35 and a mandrel removing upper die 3.
6 is supported so as to be able to advance and retreat in the horizontal direction. The upper die 36 for removing the mandrel is provided with a movable cylinder 3 as a driving device supported by a plate 37 connecting both guides 34.
8 is fixed to the piston rod 39. Thus, when the piston rod 39 of the movable cylinder 38 advances and retreats, the upper die 36 for mandrel removal is guided by the guide 34 to advance and retreat, and enters the lower part of the upper trimming die 10 or the external retreat position shown by a solid line in the figure. It is configured to retreat to. A disc spring 40 is interposed between the lower mold 16 for removing the mandrel and the wheel 17 so as to buffer a press load applied to the rail 13 when the mandrel is removed. 42 is a mandrel collection device for collecting the mandrel 31 removed from the casting,
Reference numeral 43 denotes a baseboard processing device for processing a baseboard generated when the mandrel is removed.

The operation of the trimming press configured as described above will be described. When starting the trimming operation and the mandrel removal operation, the telescopic air cylinder 23 is used.
The piston rod 24 of FIG. 1 has advanced to the forward limit position indicated by reference numeral 24A in FIG. 1, and the lower trimming die 15 and the lower mandrel removing die 16 are at the outside position shown by a chain line in FIG. The piston rod 39 of the moving cylinder 38 is retracted, and the upper die 36 for removing the mandrel is located at the outside position shown by a solid line in FIG. Therefore, the casting 50 is placed on the trimming lower mold 15 located outside the machine. From this state, the piston rod 24 of the air cylinder 23 is retracted to be positioned directly below the upper trimming die 10.

Then, when the piston rod 9 of the mold clamping cylinder 8 is advanced, the trimming upper mold 1 is moved together with the movable platen 7.
0 is lowered and trimming is performed, and surplus materials such as a flash, a gate, and a runner formed on the casting 50 are removed. Then, the piston rod 24 of the air cylinder 23 is advanced to the forward limit position to return the trimming lower mold 15 and the mandrel-pulling lower mold 16 to the chain line position outside the machine, and the trimmed casting 50 on the trimming lower mold 15 is removed. 180
Then, it is inverted and placed on the lower mandrel removing die 16 located outside the machine.

In this state, the piston rod 39 of the moving cylinder 38 is advanced to position the upper mandrel removing die 36 directly below the trimming upper die 10, and the piston rod 24 of the air cylinder 23 is retracted to remove the mandrel removing lower die. 16 is positioned directly below the upper mold 36 for removing the mandrel. When the piston rod 9 of the mold clamping cylinder 8 is advanced, the movable platen 7 descends and the mandrel removing upper die 36 integrated therewith descends.
5, the mandrel 31 is removed from the casting 50, and the mandrel 31 is collected by the mandrel collecting device 42.

When the mandrel is removed, the press load acts downward.
7, a press load is buffered by the disc spring 40, and the rail 1 on the fuselage side is pressed.
No effect on 2,13.

FIG. 5 is a front view of a trimming press as another embodiment of the present invention. Members having the same configuration as the embodiment shown in FIG. . An upper trimming die 51 is fixed to the lower surface of the movable platen 7, and a moving cylinder 53 is fixed to a bracket 52 fixed to the side surface of the movable platen 7. A mandrel removal upper die 5 supported on the movable platen 7 so as to be able to advance and retreat in the horizontal direction is attached to a piston rod 54 of the movable cylinder 53.
5 are fixed, and a plurality of mandrel extraction jigs 56 are suspended from the lower surface of the upper mandrel extraction die 55.

A lower die 57 for removing a mandrel is fixed to the upper surface of the lower fixed platen 2, and a moving cylinder 58 is fixed to the side surface of the lower fixed platen 2. A trimming upper die 60 supported on the upper surface of the lower die 57 for removing the mandrel so as to be able to advance and retreat in the horizontal direction is fixed to a piston rod 59 of the movable cylinder 58 via a connecting lever 61.

With this configuration, when the trimming operation and the mandrel removal operation are started, the piston rod 54 of the movable cylinder 53 has advanced to the forward limit position, and the mandrel extraction upper die 55 The mandrel removal jig 56 is located outside the machine. In addition, the piston rod 59 of the moving cylinder 58 is advanced, and the trimming lower mold 60 is superimposed on the mandrel-pulling lower mold 57. Therefore, when the casting is placed on the trimming lower mold 60 and the movable plate 7 is lowered by moving the piston rod 9 of the mold clamping cylinder 8 forward, the trimming is performed.
The surplus material such as the flash, the gate, the runner and the like formed at 0 are removed.

Next, after the trimmed casting is removed outside the machine, the piston rod 54 of the moving cylinder 53 is removed.
Is retracted, the upper trimming mold 51 and the upper mandrel removal die 55 move together, and the mandrel removal jig 56 is positioned at the center of the machine. The moving cylinder 59
When the piston rod 60 is retracted, the lower trimming die 61 moves outwardly, and the upper part of the lower die 57 for removing the mandrel is opened. Then, after placing the cast product on the lower mandrel lower die 57 and then moving the piston rod 9 of the mold clamping cylinder 8 forward, the upper mandrel lower die 55 moves down together with the movable platen 7 and the mandrel integrated therewith. Since the upper die 55 is lowered, the mandrel 31 is removed from the casting by the jig 56 and collected.

[0023]

As is apparent from the above description, according to the present invention, in a trimming press, a surplus attached to a casting is placed by placing a casting on a trimming lower die and lowering the trimming upper die together with a movable platen. In the trimming press for removing the material, a mandrel extraction upper die provided with a mandrel extraction jig, and a mandrel extraction lower die on which a casting is placed are provided, and these mandrel extraction upper die and mandrel extraction lower die, A drive device that moves the trimming upper die and lower trimming die so that they face each other in the machine can be used. Trimming of cast products and mandrel removal can be performed by one device, simplifying the structure. In addition, the apparatus can be provided at low cost, the cycle time is shortened, and the productivity is improved. Further, the space occupied by the apparatus is reduced, and the size of the entire machine can be reduced. Further, since a spring member is interposed between the lower mold for mandrel removal and the fuselage side, a press load acting on the fuselage side during mandrel removal can be buffered, and no large force acts on rails and the like. .

[Brief description of the drawings]

FIG. 1 is a front view of a trimming press.

FIG. 2 is a side view of a main part of the trimming press.

FIG. 3 is a plan view of a main part of the trimming press.

FIG. 4 is a longitudinal sectional view of a cast product before a mandrel is removed.

FIG. 5 is a front view of a trimming press as another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Trimming press 4 Tie rod 10 Trimming upper die 15 Trimming lower die 16 Mandrel pulling lower die 23 Hydraulic cylinder 31 Mandrel 35 Mandrel pulling jig 36 Mandrel pulling upper die 38 Moving cylinder 40 Disc spring 50 Casting product 51 Trimming upper die 53 Moving cylinder 55 Mandrel removal upper mold 56 Mandrel removal jig 57 Mandrel removal lower mold 58 Moving cylinder 60 Trimming lower mold

Claims (1)

(57) [Claims] In a trimming press for removing a surplus part attached to a casting by placing a casting on a trimming lower die and lowering the trimming upper die together with a movable platen, a mandrel removal jig provided with a mandrel removal jig is provided. An upper mold and a lower mandrel removal mold on which a casting is placed are provided, and these mandrel removal upper mold and mandrel removal lower mold are provided.
In place of the trimming upper mold and the trimming lower mold, a driving device is provided for moving in the machine so as to face each other, and a spring member for buffering a press load between the mandrel-pulling lower mold entering the machine and the machine body side. A trimming press characterized by interposition.