JP6344109B2 - Molding device for concave and convex molded products - Google Patents

Description

  The present invention is, for example, a molded product used as a cooler for cooling an electronic device such as a semiconductor or a motor, and press-molds a concavo-convex molded product having a concavo-convex group for increasing cooling efficiency. The present invention relates to a molding apparatus used.

  As this type of prior art, for example, there is one described in Patent Document 1. The cooling structure described in Patent Document 1 is applied to an inverter. The inverter includes a water jacket for circulating a cooling fluid, and a semiconductor chip is arranged on the water jacket via a bus bar, a solder layer, or the like. The water jacket includes a cooler that forms a vortex flow generating part on a part of its inner surface.

  The cooler is a plate member made of copper or copper alloy, and in the central region thereof, a semicircular groove and ridges with a cross-sectional peak are alternately arranged as a vortex flow generating part. It has uneven groups. This concavo-convex group is a series of semicircular cross-sectional grooves arranged in parallel with each other, and between the adjacent grooves is a ridge with a pointed cross section, and the ridge functions as a cooling fin. To do.

  Patent Document 1 describes a cooler forming apparatus having the above-described unevenness group. The forming apparatus includes a movable upper die integrally having a forming portion that is an inverted shape of the concavo-convex group, that is, a forming portion that is formed by arranging protrusions having a semicircular cross section in parallel and continuously with each other, and a cooler And a fixed lower mold on which the material is placed, and in cooperation with the upper mold and the lower mold, the concave and convex groups are pressure-formed by cold forging with respect to the material of the cooler.

WO2013-153914

  However, when pressure-molding the concavo-convex molded article (cooler) as described above, in a conventional molding apparatus, a molding die (upper mold) that integrally has a forming portion that is a reversed shape of the concavo-convex group. Because it was used, when subjected to high molding pressure, tensile stress is applied between the ridges in the forming part (valley part), and this causes the problem that the upper die is likely to crack. It was a problem to solve such problems.

  The present invention is made by paying attention to the above-described conventional problems, and is a molding apparatus for a concavo-convex molded product having a concavo-convex group, which eliminates cracks caused by tensile stress generated in the mold, An object of the present invention is to provide a molding apparatus for a concavo-convex molded product that can improve the service life of the mold.

An apparatus for forming a concavo-convex molded article according to the present invention includes a concavo-convex molded article having a concavo-convex group formed by alternately arranging a groove having a semicircular cross section and a ridge having a pointed cross section between adjacent grooves. It is an apparatus for subjecting the uneven group of the uneven molded product to pressure molding. The molding apparatus includes a mold having a groove formation portion having a shape corresponding to each of the grooves, the mold is, Ri formed from a plurality of split mold which is divided for each individual groove forming portion, around the mold It is provided with a sleeve that is arranged to constrain each divided mold in a collective state, and at least two adjacent divided molds of each divided mold generate a component force transverse to the pressurizing direction with respect to the pressurizing direction. The inclined molds are in contact with each other, and the split molds are in contact with each other in the tip side region having a predetermined length from the groove forming portion, and are separated from each other with a thickness smaller than the thickness of the tip side region in the other regions. Tei Ru configuration as to have, and a means for solving the conventional problems with the above configuration.

Since the molding apparatus for the concavo-convex molded product according to the present invention employs the above-described configuration, when the concavo-convex group is pressure-molded, a groove having a semicircular cross section is formed at the groove forming portion of each divided mold, and adjacent to it. Thus, a ridge having a pointed cross section between adjacent grooves is formed. As a result, in the molding apparatus, only the compressive stress is applied to the groove forming portion of each split mold, and there is no portion where tensile stress is generated in the molding die, so that the degree of freedom for forming the groove forming portion is increased and the tensile force generated in the molding die is increased. Cracks caused by stress can be fundamentally eliminated, and the life of the mold can be improved.
In addition, the above-described forming device allows the split dies to be in close contact with each other by the restraint by the sleeve and the lateral component force generated on the inclined surface, and without causing the burrs between the adjacent split dies, The protrusion can be formed satisfactorily.
Further, in the molding apparatus described above, the divided dies are brought into contact with each other in the tip side region having a predetermined length from the groove forming portion, and are separated from each other with a thickness smaller than the thickness of the tip side region in the other regions. Therefore, even if there is a dimensional error in the thickness of each split mold, the tip portions of the split molds can be brought into close contact with each other.

It is sectional drawing (A) explaining the inverter which uses an uneven | corrugated molded product as a component, and the perspective view (B) explaining the cooler which is an uneven | corrugated molded product. In one Embodiment of a shaping | molding apparatus, it is a partial perspective view (A) which shows the state at the time of shaping | molding start, and a partial perspective view (B) which shows the state at the time of completion of shaping | molding. It is a fragmentary sectional view explaining the state before shaping | molding of a shaping | molding die and an uneven | corrugated molded product. It is a fragmentary sectional view explaining the state after shaping | molding of a shaping | molding die and an uneven | corrugated molded product.

  The inverter 50 shown in FIG. 1 (A) has a concavo-convex molded product (cooler) 1 as a constituent element, and has a cooler (concave / convex molded product 1) and an electrical insulating material 52 on a water jacket 51. A bus bar 53 made of copper or the like, a solder layer 54, a heat buffer plate 55 made of copper or molybdenum, a solder layer 56, and a semiconductor chip 57 are sequentially laminated.

  The water jacket 51 is a casing opened upward, and has cooling fluid inlets 51a and outlets 51b on opposite side walls. As shown by arrows in FIG. Flow cooling fluid in the direction. The concavo-convex molded product (cooler) 1 is a rectangular plate member made of copper or copper alloy, and is disposed so as to close the upper side of the water jacket 51.

  As shown in FIG. 1 (B), the concavo-convex molded product (cooler) 1 has a semicircular groove 2 and a pointed ridge 3 as a vortex flow generating portion in a central rectangular region. Has a concavo-convex group P formed by alternately arranging. The outer side of the concavo-convex group P is a flat peripheral edge Q. This concavo-convex group P is formed by arranging the grooves 2 having a semicircular cross section in parallel and continuously with each other, and a protrusion 3 having a pointed cross section is formed between adjacent grooves 2 and 2. The concavo-convex molded product 1 is attached to the upper side of the water jacket 51 so that the arrangement of the grooves 2 and the ridges 3 is in the flow direction of the cooling fluid, and the ridges 3 function as cooling fins, A vortex flow is generated.

  Here, in the concavo-convex molded product 1 used as a cooler as described above, in order to improve the stirring performance of the boundary layer of the cooling fluid, the head of the protrusion 3 in the concavo-convex group P has an edge that is as sharp as possible (sharp edge). It is desirable that However, in the case where such a concavo-convex group P is pressure-formed by cold forging, in a molding die that integrally has a formation part that is an inverted shape of the concavo-convex group P, the formation part ( Tensile stress is applied to the valleys) and cracks are likely to occur. For this reason, in the mold having the formation part integrally, in order to prevent cracking, the R of the formation part (valley part) must be increased against the stirring performance of the protrusion 3.

  On the other hand, as shown in FIGS. 2 and 3, the molding apparatus for the concavo-convex molded article 1 in this embodiment includes a molding die 5 having a groove forming portion 4 having a semicircular cross section corresponding to each groove 2. The mold 5 includes a plurality of divided molds 6 divided for each groove forming portion 4. As a result, in the mold 5, the portion between the adjacent split dies 6 becomes the formation portion (valley portion) V of the protrusion 3 having a cross-sectional top shape, and R of the formation portion becomes substantially zero.

  As shown in FIG. 2 (A), the molding apparatus includes an upper mold holder 7 and a mold 5 composed of the above-described split mold 6 on the slide side (movable side: upper side in FIG. 1) of the press machine, A sleeve 8 is disposed around the mold 5 and restrains each divided mold 6 in a collective state. Further, the molding apparatus includes a lower mold holder 9 and a fixed mold 10 on which the material 1A of the concavo-convex molded product 1 is placed on the bolster side (fixed side: lower side in FIG. 1) of the press machine.

  In the slide, for example, the sleeve 8 is suspended via an elastic body or a retainer, and the sleeve 8 precedes the mold 5 when lowered. The sleeve 8 is a rectangular tube-shaped mold member corresponding to the peripheral edge Q of the concavo-convex molded product 1, and each split mold 6 is accommodated in the hollow portion, and each split mold 6 is constrained in a collective state. Each split mold 6 is connected to the upper mold holder 7 by a retainer (not shown) penetrating them in the arrangement direction, and is held so as not to fall off the sleeve 8.

  Further, each split mold 6 is composed of a plate-like member, and has a groove forming portion 4 having a semicircular cross section at its lower side, as shown in FIG. In the molding apparatus, at least two adjacent divided molds 6 and 6 among the divided molds 6 are in contact with each other on the inclined surfaces 6A and 6B inclined with respect to the pressing direction.

  Further, in the molding apparatus, the respective split dies 6 are in contact with each other in the tip side region A having a predetermined length from the groove forming portion 4 and are separated from each other in the region B (gap S). That is, in each split mold 4, the thickness T2 of the region B on the base end side other than the thickness T1 of the tip end region A is smaller.

  As shown in FIGS. 2A and 3, the molding apparatus for the uneven molded product 1 having the above configuration places the material 1 </ b> A on the fixed mold 10 and lowers the slide. At this time, as shown by an arrow A1 in FIG. 3 and an upper phantom line, the forming apparatus contacts the peripheral portion Q of the material 1A in advance and presses the material 1A with the fixed mold 10 as shown in FIG. Fix it.

  Then, the molding device 5 continues to descend while compressing the elastic body that holds the sleeve 8 until the slide reaches the bottom dead center, and the arrow A1 in FIG. 2B and FIG. As shown by the lower imaginary line, each split mold 6 of the mold 5 reaches the bottom dead center. Thereby, a shaping | molding apparatus forms the groove | channel 2 and the protrusion 3 in the raw material 1A, and complete | finishes shaping | molding of the uneven | corrugated molded product 1 which has the uneven | corrugated group P as shown in FIG.

  In this way, in the molding apparatus, the molding die 5 is composed of a plurality of split molds 6 divided for each individual groove forming portion 4. A groove 2 having a semicircular cross section is formed by the groove forming portion 4 and a ridge 3 having a pointed cross section is formed between adjacent split dies 6.

  For this reason, in the forming apparatus, only the compressive stress is applied to the groove forming portion 4 of each split mold 6, and the forming portion V of the protrusion 3 (valley portion) V is divided into separate split dies 6. Therefore, tensile stress does not occur in the forming portion B. Thereby, in the molding apparatus, there is no portion where the tensile stress is generated in the mold 5, so that the crack caused by the tensile stress generated in the mold 5 is fundamentally eliminated and the life of the mold 5 is improved. Can do.

  Moreover, since the said shaping | molding apparatus loses the part which a tensile stress produces in the shaping | molding die 5, it becomes a thing with a high freedom degree which shape | molds the groove | channel formation part 4 of the split mold 6. FIG. For this reason, the shaping | molding apparatus can form the uneven | corrugated group P suitable for the eddy flow production | generation part of a cooler, for example. That is, the concavo-convex group P of the concavo-convex molded product 1 formed by the molding apparatus is formed by arranging the semicircular cross-sectional grooves 2 in parallel and continuously with each other, and between the adjacent grooves 2 has a pointed cross-section. And the head of the ridge 3 has an acute edge (sharp edge). Therefore, if the concavo-convex molded product 1 is applied to the cooler of the inverter 50 shown in FIG. 1, the stirring performance of the boundary layer of the cooling fluid is extremely high, which can contribute to improvement in cooling efficiency and downsizing of the cooler.

  Further, the molding apparatus includes a sleeve 8 that is arranged around the mold 5 and restrains the divided molds 6 in a collective state, and at least two adjacent divided molds 6 of the divided molds 6 are added. Since the inclined surfaces 6A and 6B inclined with respect to the pressure direction are in contact with each other, the inclined surfaces 6A and 6B act like a wedge when the material 1A is pressed. In other words, the molding apparatus brings the divided molds 6 into close contact with each other by the restraint by the sleeve 8 and the lateral component force generated on the inclined surfaces 6A and 6B, and the cross section without causing burrs between the adjacent divided molds 6. The pointed protrusion 3 can be formed satisfactorily.

  Further, in the above molding apparatus, each of the split dies 6 is in contact with each other in the distal end side region A having a predetermined length from the groove forming portion 4 and is separated from each other in the other proximal end side region B. Even if there is a dimensional error in the thickness of the split mold 6, the tip portions of the split mold 6 can be brought into close contact with each other. Thereby, the shaping | molding apparatus can maintain the inversion shape of the uneven | corrugated group P as the shaping | molding die 5, and forms the uneven | corrugated group P accurately, without producing a burr | flash between adjacent division mold | types 6. FIG. be able to.

  In addition, as for the shaping | molding apparatus of the uneven | corrugated shaped product of this invention 1, a specific structure is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably. For example, it is possible to form a groove other than a semicircular cross section or a group of protrusions and recesses other than a pointed cross section. In the mold 5, a combination of split molds 6 having inclined surfaces is provided at a plurality of locations. May be.

P Concavity and convexity group 1 Concavity and convexity molded product 2 Groove 3 Projection 4 Groove forming part 5 Mold 6 Split type 6A, 6B Inclined surface 8 Sleeve

Claims (1)

For concave / convex molded products having concave / convex groups formed by alternately arranging semicircular cross-sectional grooves and ridges with pointed cross sections between adjacent grooves , the concave / convex groups of the concave / convex molded products are added. An apparatus for pressure forming,
Provided with a mold having a groove forming portion corresponding to each groove,
Mold, Ri formed from a plurality of split mold which is divided for each individual groove forming portion,
Provided with a sleeve that is placed around the mold and constrains each divided mold to a collective state,
At least two adjacent divided molds of each divided mold are in contact with each other at inclined surfaces that generate a component force in a lateral direction with respect to the pressing direction,
Irregularities each division type, as well as contact with each other from the groove forming part in the distal region of a predetermined length, characterized that you have separated from each other in the smaller than the thickness of the distal region thickness in the other regions Molding device.

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