KR100775807B1 - Metallic pattern unit of warm hydro-forming system - Google Patents

Abstract

A mold unit for a warm hydro-forming system is provided to heat a tube workpiece and an operating fluid such that a tube expanding process is performed on the tube workpiece by securing formability of the tube workpiece at a warm condition by using elongation characteristics of an aluminum alloy tube workpiece according to temperature. A mold unit for a warm hydro-forming system comprises: a upper mold insulating case(13) inserted into the insert groove by forming an insert groove(G) in a longitudinal center on a section of an upper mold(3) correspondingly to a lower mold(1); an upper mold insert die(15) which is inserted into the upper mold insulating case, which has an upper forming face(17) formed on one face thereof, and in which a plurality of through holes are longitudinally formed in a periphery of the upper forming face; a lower mold insulating case(21) inserted into the insert groove by forming an insert groove(G) in a longitudinal center on a section of the lower mold correspondingly to the upper mold; a lower mold insert die(23) which is inserted into the lower mold insulating case, which has a lower forming face(25) formed on one face thereof, and in which a plurality of through holes are longitudinally formed in a periphery of the lower forming face; and a plurality of heating rods(11) which are formed in a rod shape and inserted into the respective through holes of the upper and lower mold insert dies by passing through the upper and lower mold insulating cases respectively from each one side portion of the upper and lower molds.

Description

Mold unit for warm hydraulic forming system {METALLIC PATTERN UNIT OF WARM HYDRO-FORMING SYSTEM}

1 is a cross-sectional view of a construction of a warm hydraulic forming system to which the present invention is applied.

2 is a perspective view of a mold unit for a warm hydraulic forming system according to an embodiment of the present invention.

3 is a cross-sectional view taken along the line A-A of FIG.

Figure 4 is an exploded perspective view of the upper mold of the mold unit according to an embodiment of the present invention.

5 is an exploded perspective view of a lower mold of a mold unit according to an exemplary embodiment of the present invention.

6 is a cross-sectional view of a hydraulic molding system to which a general mold unit is applied.

The present invention relates to a mold unit for a warm hydraulic forming system, and more particularly, by using an elongation characteristic according to the temperature of an aluminum alloy tube material, the tube material and a working fluid are formed to secure the formability at a warm temperature to achieve expansion molding. The present invention relates to a mold unit for a warm hydraulic forming system which enables heating.

In general, the hydraulic forming (HYDRO-FORMING) is made at room temperature (10 ℃ ~ 30 ℃), one of the special processing method of the machine sheet metal to expand the tube material by using the hydraulic pressure (hydraulic pressure), front in the automotive industry, etc. It is effective in reducing the weight and molding cost of press products made of a combination of large and small unit panels such as side members.

Also in the tube material applied to the above-mentioned hydraulic forming (HYDRO-FORMING), in order to reduce the weight, high-strength aluminum alloy is often used in place of iron-based materials, and in the case of such high-strength aluminum alloy, formability at room temperature Compared with iron-based materials, the moldability is secured through softening treatment before molding, and then stepwise hydraulic molding is performed. In this case, the softening treatment increases the elongation while lowering the strength of the aluminum material, and the annealing heat treatment is most commonly used.

In this case, in order to secure the formability of the tube material, such as aluminum alloy, a sufficient elongation must be secured in consideration of a portion having the maximum deformation amount according to the shape of the molded article. It can be called a process.

In the conventional hydraulic molding of such an aluminum alloy, the tube material of the aluminum alloy is softened in advance so as to sufficiently secure the elongation of the material in consideration of the deformation amount according to the shape of the molded article.

As described above, the tube material which secures the elongation through the softening process is loaded on the lower mold 101 of the hydraulic die press mold as shown in FIG. 6, and then the upper mold 103 of the upper portion is lowered. The hydraulic cylinders 105 disposed at both ends of the tube material 100 in the state pressurize the punch 107 in the axial direction to seal and simultaneously apply axial compression to seal the mold. And mounting of the hydraulic cylinder 105 is completed.

As described above, the tube material 100 is fixed by the lower mold 101, the upper mold 103, and both sealing punch 107, and together with the self-accumulation of the hydraulic cylinders 105, the tube material. By supplying a hydraulic pressure through the cylinder punch 107 into the interior of the 100, the tube material 100 is expanded along the molding surfaces 109 and 111 formed in the upper mold 103 and the lower mold 101, respectively, so that at room temperature Hydraulic molding of is achieved.

As described above, the tube material 100, which has been hydraulically molded, is taken out from the lower mold 101 and the upper mold 103, and the tube material 100 undergoes a softening process to secure the elongation. By performing a separate hardening process for reinforcing the strength of the weakened tube material 100 to ensure the required strength as a molded article.

By the way, in order to hydraulically mold the high-strength aluminum alloy tube material 100 by the conventional hydraulic molding as described above, a softening process is necessary before molding in order to secure the formability, but such softening process is the material Molding quality can not be guaranteed due to a significant drop in the strength of the mold, and after molding, a separate hardening process is added to reinforce the strength of the material. There was a problem such as adversely affecting.

Therefore, in recent years, a warm hydraulic forming system has been studied so that the tube material 100 such as aluminum alloy can be expanded in order to sequentially perform hydraulic expansion molding while securing sufficient moldability within a set temperature range using elongation characteristics according to temperature. The warm hydraulic forming system is basically the same as a general hydraulic forming system, but should be provided with a separate heating means for heating the tube material 100 with a working fluid to a set temperature. There have been difficulties in solving the problem.

The present invention has been invented to solve the structural difficulties for heating the tube material and the working fluid in the above-mentioned warm hydraulic forming system, the object of the present invention is to use the elongation characteristics according to the temperature of the aluminum alloy tube material in the warm It is to provide a mold unit for a warm hydraulic forming system that can heat the tube material and the working fluid so as to secure the formability to achieve expansion molding.

The mold unit for a warm hydraulic forming system according to the present invention for achieving the above object has an upper mold and a lower mold, and the upper mold has an insert groove formed in a longitudinal center in the longitudinal direction on a cross section corresponding to the lower mold. An upper heat insulating case installed to be inserted into the upper portion; An upper die insert formed between the upper die insulation case and an upper die surface on one surface thereof, and a plurality of through holes formed around the upper die surface along a longitudinal direction thereof; The lower mold includes a lower mold insulating case formed by inserting the insert groove in the longitudinal center in the longitudinal direction of the cross section corresponding to the upper mold; A lower mold insert die installed inside the lower mold insulating case, and having a lower molding surface formed on one surface corresponding to the upper molding surface, and having a plurality of through-holes formed around the lower molding surface along a longitudinal direction thereof; And a plurality of heating rods formed in a rod shape and penetrating through the upper mold insulation case and the lower mold insulation case at each side of the upper mold and the lower mold, respectively, and are inserted through the through holes of the upper mold insert and the lower mold insert. It is done.

In addition, a plurality of upper and lower dies which penetrate side surfaces of the upper and lower die insulation cases detect the temperature of the upper and lower die inserts and detect the temperature of the upper and lower insert dies, respectively, and output the signal. Three thermocouples are mounted, and the thermocouples are mounted through the through-holes by forming a plurality of through-holes on the outer side of the upper and lower molds.

In addition, punch mounting grooves are formed at the centers of both sides of the upper mold and the upper mold insulation case and the lower mold and the lower mold insulation case, and the upper mold insulation case and the upper mold insert mold form bolt holes at both edges thereof to fasten the bolt integrally to the upper mold. The lower mold insulation case and the lower mold insert mold are characterized by being bolted integrally to the lower mold by forming bolt holes on both side edges thereof.

In addition, a guide post is provided on each side of each corner portion of the lower mold corresponding to the upper mold, and each post housing for guiding the guide posts is mounted on each corner of the upper mold corresponding to the guide post. It is characterized by.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration of a warm hydraulic molding system to which the present invention is applied, Figure 2 is a perspective view of a mold unit according to an embodiment of the present invention, Figure 3 is a cross-sectional view of the mold unit according to an embodiment of the present invention.

4 and 5 are exploded perspective views of the upper mold and the lower mold of the mold unit according to the embodiment of the present invention.

First, in the warm hydraulic forming system to which the present invention is applied, the characteristics of elongation according to the temperature of aluminum, that is, the temperature of aluminum is high (about about) without performing the softening process by heat treatment of the aluminum alloy tube material 10 of high strength. When the temperature increases to 50 ° C. to 300 ° C.), the strength decreases, the elongation rapidly increases, and when the temperature decreases to room temperature (room temperature of the workplace of about 10 ° C. to 30 ° C.), the strength decreases. It is raised again, the elongation is lowered again to form the tube material 10 by the warm hydraulic molding at the high temperature (up to about 50 ℃ ~ 300 ℃) by using the characteristics of maintaining the properties of the strength and elongation of the initial room temperature state It ensures both the castle and the required strength at the same time.

The basic configuration of such a warm hydraulic molding system, as shown in Figure 1, the lower mold 1 is mounted on the lower portion of the press equipment (not shown) and the upper portion proceeds to the lower by the press equipment (not shown) above The upper die 3 is provided with the lower die 1 to pressurize the tube material 10.

In addition, left and right hydraulic cylinders 5 are disposed at both sides of the lower mold 1 to correspond to both ends of the tube material 10, and each hydraulic cylinder 5 is equipped with a sealing punch 7 respectively. Each sealing punch 7 is fitted to both ends of the tube material 10 so as to supply an axial compress and a working fluid in the axial direction, respectively.

In addition, the mold of the present invention as shown in Figure 2 so that the working fluid supplied to the inside of the tube material 10 through the sealing punch 7 and the tube material 10 can be heated to a high temperature to a predetermined temperature The unit MP is provided with a heating rod 11 that is a heating means.

As described above, the configuration of the mold unit MP according to the present embodiment including the heating rod 11 will be described with reference to FIGS. 2 and 3, 4, and 5.

That is, an insert groove G is formed in the upper die 3 of the mold unit MP according to the present embodiment in the longitudinal center of the cross section corresponding to the lower die 1, and an upper die is formed in the insert groove G. The heat insulation case 13 is inserted and installed.

An upper die insert 15 is inserted into the upper die insulation case 13, and the upper die die 15 has an upper molding surface 17 formed on one side thereof, and the upper die die 15 is formed along the longitudinal direction. Four through holes 19 are formed around the upper molding surface 17 at regular intervals.

The lower die 1 is provided with an insert groove G in the longitudinal center of the cross section corresponding to the upper die 3, and a lower mold insulating case 21 is fitted in the insert groove G.

In addition, a lower mold insert die 23 is inserted and installed inside the lower mold insulation case 21, and the lower mold insert 25 has a lower mold surface 25 on one surface corresponding to the upper mold surface 17. Four through holes 27 are formed around the lower molding surface 25 in the longitudinal direction.

Here, punch mounting grooves 29 in which both sealing punches 7 are fitted are formed at centers of both sides of the upper die 3, the upper die insulation case 13, and the lower die 1 and the lower die insulation case 21. do.

In addition, the upper heat insulating case 13 and the upper mold insert 15 is formed by bolt holes 31 on both side edges and bolted integrally to the upper mold 3, and the lower mold insulating case 21 and the lower mold insert The mold 23 also forms bolt holes 31 at both edges thereof and is bolted integrally to the lower mold 1.

And eight heating rods (11) formed in the shape of a rod penetrates the upper mold case (13) and the lower mold case (21) at each side of the upper mold (3) and the lower mold (1) by four It is fitted through each of the through holes 19 and 27 of the insert die 15 and the lower die insert 23.

On the other hand, each of the upper mold (3) and the lower mold (1) through the hole (H) on the side of the upper mold insulating case 13 and the lower mold insulating case 21 through the upper insert die 15 and the lower mold insert die Three thermocouples 33 (thermocouples) for detecting the temperature of the upper insert die 15 and the lower insert die 23 and outputting the signals in contact with the 23 are mounted.

That is, the thermocouple 33 forms three through holes 35 on the outer side of the upper mold 3 and the lower mold 1 and is mounted through the through holes 35.

In addition, a guide post 37 is provided on each side of each corner portion of the lower mold 1 corresponding to the upper mold 3, and a guide post 37 is provided on each corner of the upper mold 3 corresponding to the guide post 37. Each post housing 39 for guiding each of the guide posts 37 is mounted.

Therefore, as shown in FIG. 1, the mold unit MP having the above-described configuration is molded in a state in which the tube material 10 to be molded is inserted between the upper mold 3 and the lower mold 1. Punch mounting groove formed on both sides of the upper mold (3) and the upper mold insulating case 13 and the lower mold (1) and the lower mold insulating case 21 by the operation of the two hydraulic cylinder (5) ( 29 is fitted to both ends of the tube material (10) through.

At this time, when the working fluid is supplied to the inside of the tube material 10 to be molded through the one-side sealing punch 7, the controller not shown outputs an electrical signal to the heating rod 11 to heat the heating rod 11. As a result, the upper insert die 15 and the lower insert die 23 are heated to heat the tube material 10 and the working fluid therein.

Accordingly, the mold unit MP according to the present embodiment is applied to a warm hydraulic forming system to achieve hydroforming molding of the aluminum alloy tube material 10 in a warm state.

Here, in the heating temperature control of the tube material 10 and the working fluid, the thermocouple 33 detects the temperature of the upper insert die 15 and the lower insert die 23 and displays a temperature signal thereof. Outputting, the controller is configured to maintain the heat generation temperature of the upper insert die 15 and the lower insert die 23 in the setting range by outputting the electrical signal to the heating rod 11 in consideration of the temperature signal and the set temperature. .

As described above, according to the mold unit for a warm hydraulic molding system according to the present invention, an aluminum alloy tube is formed so that thermal energy of an upper insert die and a lower insert die heated by a heating rod is conducted to a tube material to be molded and a working fluid therein. By using the elongation characteristic according to the temperature of the material, it is possible to achieve the expandable hydraulic molding by securing the formability in the warm.

In addition, by applying an insulating case between the upper and lower insert dies and the lower and lower insert dies, respectively, the heat efficiency of the upper and lower insert dies, which are passed by the heating rod, is blocked as much as possible from the outside to radiate heat to the outside, thereby increasing energy efficiency. have.

Claims (7)

In a mold unit for a warm hydraulic forming system composed of an upper mold and a lower mold, The upper mold includes an upper heat insulating case formed by inserting the insert groove in the longitudinal center in the longitudinal direction of the cross section corresponding to the lower die; An upper die insert formed between the upper die insulation case and an upper die surface on one surface thereof, and a plurality of through holes formed around the upper die surface along a longitudinal direction thereof; The lower mold includes a lower mold insulating case formed by inserting the insert groove in the longitudinal center in the longitudinal direction on the cross section corresponding to the upper mold; A lower mold insert die installed inside the lower mold insulating case, and having a lower molding surface formed on one surface corresponding to the upper molding surface, and having a plurality of through-holes formed around the lower molding surface along a longitudinal direction thereof; And a plurality of heating rods formed in a rod shape and penetrating through the upper mold insulation case and the lower mold insulation case at each side of the upper mold and the lower mold, respectively, and are inserted through the through holes of the upper mold insert and the lower mold insert. Mold unit for warm hydraulic forming system The method of claim 1, The outer side of the upper mold and the lower mold penetrates the side surfaces of the upper mold insulation case and the lower mold insulation case and detects the temperature of the upper mold insert die and the lower mold insert die in a state of being in contact with the upper mold insert die and the lower mold insert die, respectively. The mold unit for a warm hydraulic forming system, characterized in that the thermocouple is mounted. The method of claim 2, The thermocouple is a mold unit for a warm hydraulic forming system, characterized in that the through-hole is formed by forming a plurality of through-holes on the outer side of the upper and lower dies. The method of claim 1, Mold unit for a warm hydraulic forming system, characterized in that the punch mounting groove is formed in the center of both sides of the upper and upper insulating case and the lower and lower insulating case. The method of claim 1, The upper mold insulation case and the upper mold insert mold is formed in the bolt holes on both sides of the edge mold unit for the warm hydraulic molding system, characterized in that the bolt is integrally fastened to the upper mold. The method of claim 1, The lower mold case and the lower mold insert is a mold unit for a warm hydraulic molding system, characterized in that the bolt holes are formed on both side edges to be integrally bolted to the lower mold. The method of claim 1, On the cross section of the lower die corresponding to the upper die, guide posts are respectively provided on one side of each corner portion, and each post housing for guiding the guide posts is mounted on each edge of the upper die corresponding to the guide post. Mold unit for warm hydraulic forming system

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