JP7292715B2 - SEMI-SOLID MATERIAL FORGING APPARATUS AND SEMI-SOLID MATERIAL FORGING METHOD - Google Patents

Description

The present invention provides a semi-solid material forging apparatus and a semi-solid material forging method for continuously and reliably forming a semi-solid material in which a liquid phase and a solid phase are mixed (for example, a semi-solid alloy made of an aluminum alloy or a magnesium alloy). Regarding.

Methods for forming semi-solid materials such as aluminum alloys include casting and forging.
In the forging method, if a semi-solid material is molded with two dies, a lower die (stationary die) and an upper die (movable die) similar to a general forging machine used for molding solid materials, The semi-solidified material easily spreads vertically and horizontally and is easily deformed, making it easy to mold. It occurs frequently and causes trouble.
In other words, when pressurized by the mold, the thin semi-solidified material inserted (protruded) into the mating surface of the mold suddenly loses heat from the mold and solidifies, and the solidified part becomes an obstacle. As a result, the mold cannot be closed reliably. As a result, the solidified portion on the outer periphery of the mold is subjected to pressure, and insufficient pressure is applied to the semi-solidified material (product portion) inside the mold. Due to such insufficient pressurization, defects such as poor circulation of the molten metal, wrinkles in the molten metal, and internal cavities occur in the product, leading to the problem of a decrease in yield.
In order to solve this problem, Patent Document 1 previously filed by the applicant of the present application discloses that one mold has a recess for placing a semi-solid material, and the other mold has a semi-solid material. A semi-solid alloy forging device having a pressurizing part that pressurizes and a closed space forming part movably provided in the pressurizing direction of the pressurizing part, and a semi-solidified material is arranged in a recess of one die After that, the parting surface of one of the molds and the parting surface of the closed space forming portion are brought into contact with each other, and the semi-solidified material in the recess is pressed by the pressurizing part while suppressing the insertion of the semi-solidified material into these parting surfaces. A method for forging a semi-solidified alloy is disclosed in which the is pressed and shaped.

Japanese Patent No. 6018251

The semi-solidified alloy forging method and forging apparatus disclosed in Patent Document 1 surround the outer periphery of the concave portion of one die (lower die) with a closed space forming portion so that the semi-solidified material placed in the concave portion is placed between the parting surfaces. It is intended to prevent the semi-solidified material from being inserted (protruding) into the recess and to pressurize the semi-solidified material in the concave portion reliably by the pressurizing part.
However, since the closed space forming part is attached so as to be movable relative to the pressurizing part by a mechanically movable member or an elastic member, when the semi-solidified material adhering to the closed space forming part adheres to the closed space forming part, the closed space is formed. However, there is a need to improve the stability of operation. In addition, since the closed space forming part is provided so as to be movable in the pressurizing direction (vertical direction) of the pressurizing part, the parting surface of one mold (lower mold) and the parting surface of the closed space forming part At the stage of matching the surfaces, there is a risk that the outer peripheral portion (part) of the semi-solidified material that could not be accurately entered into the designated material input position (recess) may be crushed (caught) by the closed space forming portion. In this case, sufficient pressurization may not be obtained, leading to poor molding.
The present invention has been made in view of such circumstances, and is intended to reliably prevent the pinching (extrusion) of a semi-solidified material during molding, generate a sufficient pressurizing force, improve the rate of non-defective products, and improve work efficiency. It is an object of the present invention to provide a semi-solid material forging device and a semi-solid material forging method.

A semi-solid material forging apparatus according to a first invention that meets the above object is a semi-solid material forging apparatus that pressurizes and molds a semi-solid material,
a lower mold having a recess into which the semi-solidified material is introduced;
A plurality of split dies are provided horizontally movably on the upper surface of the lower die, and each of the split dies surrounds the outer periphery of the upper space of the recess from the side and extends to the upper end peripheral edge of the recess. A horizontal type that suppresses the protrusion of the solidified material,
an upper mold having a pressurizing part that is inserted into the interior of the horizontal mold from above the horizontal mold and pressurizes the semi-solidified material in the recess ;
The shape of the outer peripheral surface of the pressurizing portion matches the shape of the inner peripheral surface of the horizontal mold in the closed state and the shape of the upper inner peripheral surface of the recess.

In the semi-solid material forging apparatus according to the first invention, it is preferable to include locking means for fixing and clamping the split dies.

A semi-solid material forging method according to a second invention that meets the above object is a semi-solid material forging method for pressurizing and molding a semi-solid material,
a material charging step of charging the semi-solidified material into the concave portion of the lower mold;
Before pressurizing the semi-solidified material, a plurality of split molds are horizontally moved on the upper surface of the lower mold to laterally surround the outer periphery of the upper space of the recess and push the semi-solidified material to the upper peripheral edge of the recess. A surrounding process that suppresses the protrusion of the
a pressurizing step of pressurizing and molding the semi-solidified material in the recess with a pressurizing part of an upper mold ;
The shape of the outer peripheral surface of the pressurizing portion matches the shape of the inner peripheral surface of the horizontal mold in the closed state and the shape of the upper inner peripheral surface of the recess.

In the semi-solid material forging method according to the second aspect of the invention, it is preferable that in the enclosing step, the split dies are fixed and clamped.

In the semi-solid material forging apparatus according to the first invention and the semi-solid material forging method according to the second invention, before pressurizing the semi-solid material with the upper mold, the outer periphery of the upper space of the recess is formed by the plurality of split molds. To reliably prevent the semi-solidified material from being pinched during molding and to generate a sufficient pressurizing force to improve the rate of non-defective products by suppressing the protrusion of the semi-solidified material to the upper end peripheral edge of the concave portion by enclosing it from the side. This makes it difficult for malfunctions to occur and improves work efficiency.

When the split molds are fixed and clamped, the split molds do not open outward during pressure molding, which reliably prevents the semi-solidified material from protruding (flowing out) and improves moldability. .

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows the semi-solid material forging apparatus which concerns on one embodiment of this invention. FIG. 2 is a view taken along the line AA of FIG. 1; It is a longitudinal cross-sectional view which shows the surrounding process of the semi-solid material forging method using the same semi-solid material forging apparatus. It is a principal part top view which shows the surrounding process of the same semi-solid material forging method. It is a longitudinal cross-sectional view which shows the pressurization process of the same semi-solid material forging method.

Next, specific embodiments of the present invention will be described with reference to the attached drawings for better understanding of the present invention.
A semi-solid material forging apparatus 10 according to one embodiment of the present invention shown in FIGS. belongs to.

Details of the semi-solid material forging apparatus 10 will be described below.
As shown in FIGS. 1 to 5, semi-solid material forging apparatus 10 includes lower die 13 having recess 12 into which semi-solid material 11 is introduced. The shape, size, etc. of the recess 12 and the lower mold 13 can be appropriately selected according to the shape, size, etc. of the product to be molded. In addition, the semi-solid material forging apparatus 10 has a plurality of split dies 15 that are horizontally movably provided on the upper surface 14 of the lower die 13 , and each split die 15 laterally moves the outer periphery of the upper space 16 of the recess 12 . A horizontal mold 17 surrounds the recess 12 to prevent the semi-solidified material 11 from protruding to the upper peripheral edge of the recess 12 . A split drive unit 18 such as a hydraulic cylinder is connected to the outside of each split mold 15 , and the horizontal mold 17 is opened and closed by horizontally moving each split mold 15 with each split mold drive unit 18 . At this time, the upper surface 14 of the lower mold 13 and the lower surface 20 of each split mold 15 are in close contact. When viewed from above with the horizontal mold 17 closed, the inner peripheral surface 21 of the horizontal mold 17 (each split mold 15) and the upper inner peripheral surface 22 of the recess 12 are aligned (see FIG. 4). Each split mold 15 moves horizontally and approaches the upper space 16 from the side to surround the outer periphery of the upper space 16, so that the semi-solidified material 11 put into the recess 12 is transferred to the lower mold 13 and each split mold. It is possible to prevent it from being caught (flowing out) between it and the mold 15 . Further, even if part of the semi-solidified material 11 protrudes from the upper side of the recessed portion 12 to the peripheral edge (upper surface side of the lower die 13) at the time when the semi-solidified material 11 is put into the recessed portion 12, the inside of each split mold 15 Since it is pressed by the peripheral surface 21 and accommodated inside the upper space 16, the protrusion of the semi-solidified material 11 can be effectively prevented.

Next, the semi-solid material forging apparatus 10 has an upper die 25 having a pressurizing part 24 that is inserted from above the horizontal die 17 into the interior (upper space 16 ) of the horizontal die 17 and pressurizes the semi-solidified material 11 in the recess 12 . I have it. Here, the shape of the outer peripheral surface 26 of the pressurizing portion 24 matches the shapes of the inner peripheral surface 21 of the horizontal mold 17 (the split mold 15 in the closed state) and the upper inner peripheral surface 22 of the recess 12 . As a result, the semi-solidified material 11 can be reliably pressurized and molded between the lower mold 13 and the upper mold 25 . The upper mold 25 is vertically movable (liftable) by an upper mold drive unit such as a hydraulic cylinder (not shown). The shapes of the recess, the lower mold, the pressurizing part, and the upper mold can be appropriately selected according to the shape of the product to be molded.

The semi-solid material forging apparatus 10 is provided with locking means 28 for fixing and clamping the split dies 15 . Before pressurizing the semi-solidified material 11 with the upper die 25, the split dies 15 (horizontal dies 17) are prevented from opening outward during pressurization by fixing and clamping the split dies 15 with the locking means 28. , the protruding (outflowing) of the semi-solidified material 11 can be reliably prevented. The locking means may be any device that can fix each of the split dies 15 in a state in which the outer periphery of the upper space 16 is surrounded by the plurality of split dies 15 (closed state of the horizontal die 17). A fixed one is preferably used. In the locking means 28 of this embodiment, the engaging projections 29 are formed at the end positions where the adjacent split dies 15 contact each other, and the two engaging projections 29 of the adjacent split dies 15 are engaged. The mold was clamped by a fixed block 31 having an engaging recess 30 to be fitted. This fixing block 31 may be manually attached and detached. By automating attachment and detachment of the block 31, labor can be saved and workability can be improved. In addition, the structure of the lock means can be appropriately selected without being limited to the present embodiment. In the present embodiment, the horizontal mold 17 is composed of the two split molds 15. However, the number of split molds (the number of divisions of the horizontal mold) and the shape of the mold may vary depending on the shape and size of the lower mold, the shape of the recess, and the like. can be selected as appropriate. For example, the number of split molds is preferably about 2 to 4, but may be 5 or more.
The materials of the lower die 13, horizontal die 17 (separate dies 15), and upper die 25 are the same as those used in ordinary molds, and cast iron is preferably used.

A semi-solid material forging method according to an embodiment of the present invention will be described based on the operation (usage method) of the semi-solid material forging apparatus 10 configured as described above.
First, as shown in FIGS. 1 and 2, the upper mold 25 is raised, and with the split mold 15 (horizontal mold 17) open, the semi-solidified material 11 is introduced into the recess 12 of the lower mold 13 (the material input process).
Next, as shown in FIGS. 3 and 4, each split mold 15 is moved horizontally by the upper surface 14 of the lower mold 13 by the split mold drive unit 18 so as to enclose the outer periphery of the upper space 16 of the recess 12 from the side. to suppress the protrusion of the semi-solidified material 11 to the upper edge of the recess 12 . Then, the fixed block 31 is slid by the lock driving portion 32, and the engagement recess 30 is engaged so as to straddle the two engagement projections 29 of the adjacent split molds 15 to clamp the mold. surrounding process).
Finally, the upper mold driving unit (not shown) lowers the upper mold 25, and as shown in FIG. is pressurized and molded (above, pressurizing step).

By the above operation, it is possible to reliably prevent the semi-solidified material 11 from protruding to the upper end peripheral edge of the recess 12, so that a sufficient pressurizing force can be generated and the non-defective product rate can be improved. In addition, since the protrusion of the semi-solidified material 11 is prevented by the horizontal die 17, there is no need to excavate the recess of the lower die much deeper than the product height for the purpose of preventing protrusion, and the workability of the lower die (recess) is excellent. . The lower die is provided with a knockout pin (not shown) for taking out the product from the recess, but the horizontal die can be opened outward (to the side) of the recess, allowing the product to be easily taken out by pushing it up slightly. Therefore, the stroke of the knockout pin can be shortened. As described above, the work efficiency can be improved, the molding work can be performed continuously in a short time, and the productivity can be improved.

In general, due to the nature of forging, there is a limit to the distance between the upper die (pressurizing side movable part, movable die) and the lower die (fixed die). ) will be restricted, and considering the product removal from the lower die, etc., it will be necessary to use a large forging device that matches the product size (height).
Here, a great advantage of forging a semi-solid material is that the semi-solid material, which is a mixture of a liquid phase and a solid phase, can be easily deformed greatly with a small force. For this reason, there is an advantage that it is not necessary to use a large forging machine, but if the forging machine is selected according to the stroke amount according to the product shape (height), a large forging machine must be used meaninglessly. There is a risk that it will become necessary.
On the other hand, if the semi-solid material forging apparatus 10 provided with the movable horizontal die 17 (having a plurality of split dies 15) is used as in the present embodiment, the task of extracting the vertically elongated product from the lower die 13 becomes unnecessary. Since it becomes easy, it also becomes possible to manufacture a taller (longer) molding.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and all modifications of conditions that do not deviate from the gist of the present invention are within the scope of the present invention.
For example, in the above embodiment, the lower end position of the pressurizing part during molding was set lower than the upper surface of the lower mold, and molding was performed using only the upper and lower dies. Molding can also be performed using an upper mold, a lower mold, and a horizontal mold, which are higher than the upper surface of the lower mold. In this case, it is possible to mold a long product without deeply digging the concave portion of the lower mold, which is less subject to restrictions on the shape of the product, and which is excellent in workability of the lower mold (concave portion).

10: Semi-solid material forging device, 11: Semi-solid material, 12: Concave portion, 13: Lower mold, 14: Upper surface, 15: Split mold, 16: Upper space, 17: Horizontal mold, 18: Split type drive unit, 20: Lower surface, 21: inner peripheral surface, 22: upper inner peripheral surface, 24: pressure member, 25: upper die, 26: outer peripheral surface, 28: lock means, 29: engaging projection, 30: engaging recess, 31: fixed block, 32: drive for locking

Claims (4)

In a semi-solid material forging device that presses and molds a semi-solid material,
a lower mold having a recess into which the semi-solidified material is introduced;
A plurality of split dies are provided horizontally movably on the upper surface of the lower die, and each of the split dies surrounds the outer periphery of the upper space of the recess from the side and extends to the upper end peripheral edge of the recess. A horizontal type that suppresses the protrusion of the solidified material,
an upper mold having a pressurizing part that is inserted into the interior of the horizontal mold from above the horizontal mold and pressurizes the semi-solidified material in the recess ;
A semi-solid material forging apparatus, wherein the shape of the outer peripheral surface of the pressurizing part matches the shape of the inner peripheral surface of the horizontal mold in a closed state and the shape of the upper inner peripheral surface of the recess. 3. A semi-solid material forging apparatus according to claim 2, further comprising locking means for fixing and clamping said split dies. In the semi-solid material forging method for pressurizing and molding the semi-solid material,
a material charging step of charging the semi-solidified material into the concave portion of the lower mold;
Before pressurizing the semi-solidified material, a plurality of split molds are horizontally moved on the upper surface of the lower mold to laterally surround the outer periphery of the upper space of the recess and push the semi-solidified material to the upper peripheral edge of the recess. A surrounding process that suppresses the protrusion of the
a pressurizing step of pressurizing and molding the semi-solidified material in the recess with a pressurizing part of an upper mold ;
A semi-solid material forging method, wherein the shape of the outer peripheral surface of the pressurizing part matches the shape of the inner peripheral surface of the horizontal mold in a closed state and the shape of the upper inner peripheral surface of the recess. 4. A method for forging a semi-solid material according to claim 3, wherein in said enclosing step, said split dies are fixed and clamped.

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