KR100775808B1 - A oil heating device of warm hydro-forming system - Google Patents

Abstract

A fluid heating equipment for a warm hydro-forming system is provided to supply operating fluid to a tube workpiece at high temperature using elongation characteristics of an aluminum alloy tube workpiece according to temperature, thereby heating an operating fluid without generating a boiling phenomenon such that a tube expanding process is performed on the tube workpiece. A fluid heating equipment(HU) for a warm hydro-forming system comprises: a heating pipe part(HL) formed by coiling, in a coil shape, one side of a supply pipe(L) for supplying an operating fluid to one side of a sealing punch; a heating furnace housing(21) which is formed in a cylindrical shape to house the heating pipe part, and of which an upper part is opened; a housing insulating wall(25) which forms a wall with a predetermined thickness along a bottom surface(F1) and an inner peripheral surface(F2) of the heating furnace housing, and in which a heating space part(HS) is formed such that the heating pipe part is positioned in a non-contact state within the heating space part; a cover(27) mounted to cover an upper part of the heating furnace housing; a cover insulating wall(29) which forms a wall with a predetermined thickness on an inner peripheral surface of the cover, and which is closely adhered to the housing insulating wall; a heating coil(33) which is coiled along an inner part of the housing insulating wall in a predetermined distance, and which generates a heat to a predetermined temperature according to a control signal of a controller(20); and a thermocouple(35) which is mounted on a central one side of the cover such that the thermocouple passes through the cover insulating wall and contacts the heating space part to output the temperature detection signal to the controller by detecting an internal temperature of the heating space part.

Description

Fluid heating device for warm hydraulic forming system {A OIL HEATING DEVICE OF WARM HYDRO-FORMING SYSTEM}

1 is a configuration of a warm hydraulic molding system to which the present invention is applied.

2 is a perspective view of a fluid heating device according to an embodiment of the present invention.

3 is a cross-sectional view of a fluid heating device according to an embodiment of the present invention.

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

5 is a cross-sectional view of a general hydraulic molding system.

The present invention relates to a fluid heating device for a warm hydraulic molding system, and more particularly, to obtain a high temperature working fluid so as to achieve the expandable hydraulic molding by using the elongation characteristic according to the temperature of the aluminum alloy tube material to secure the formability in warm. The present invention relates to a fluid heating device for a warm hydraulic forming system that can be supplied.

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), the front side in the automotive industry, etc. It is effective in reducing the weight of press products and molding cost, which are composed of a combination of large and small unit panels like 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.

In this way, 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. 5, 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 compressive molding to mold the mold and The 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, the tube material 100, such as aluminum alloy, by using the elongation characteristics according to the temperature, can be carried out in order to sequentially perform expansion pipe hydraulic molding while ensuring sufficient moldability within the set temperature range, as shown in FIG. As described above, a warm hydraulic molding system has been studied, and such a warm hydraulic molding system is basically configured in the same manner as a general hydraulic molding system, but a high temperature molding fluid is heated by heating a fluid acting inside the tube material 100 to a set temperature. It is configured to include an external fluid heater (HU) for supplying.

However, such a fluid heating device (HU) has to prevent the boiling of the fluid in contact with the inner surface of the heating pipe of the supply pipe (L) in the process of heating the fluid to a high temperature in the supply pipe (L), the life of the working fluid To extend the bar, there is a problem that must solve the technical problem.

Therefore, the present invention has been invented by the above-mentioned demands, and an object of the present invention is to secure the formability at warm temperature by using the elongation characteristic according to the temperature of the aluminum alloy tube material without boiling phenomenon of the working fluid to achieve expansion-liquid pressure molding. It is to provide a fluid heating device for a warm hydraulic molding system that can be heated to supply a high-temperature molding fluid.

Fluid heating device for a warm hydraulic pressure molding system according to the present invention for achieving the above object is a heating pipe portion formed by winding one side of the supply pipe for supplying the working fluid to one side of the sealing punch in a coil shape; A furnace housing formed in a cylindrical shape to receive the heating pipe, and having an upper portion opened; A housing insulation wall forming a wall along a bottom surface and an inner circumferential surface of the heating furnace housing and having a heating space formed therein so that the heating pipe portion is positioned in a non-contact state; A cover mounted to cover an upper portion of the heating furnace housing; A cover insulating wall formed on the inner surface of the cover with a predetermined thickness and in close contact with the housing insulating wall; A heating coil configured to be wound around the inside of the housing insulation wall at a predetermined interval and generate heat up to a predetermined temperature according to a control signal of a controller; And a temperature sensing means mounted on one side of the center of the cover to penetrate the cover heat insulating wall to detect the temperature inside the heating space and output the signal to the controller.

A connector for connection of wiring for electrically connecting the heating coil and the temperature sensing means and the controller is configured at one side of the outer surface of the heating housing.

Preferably, the housing insulation wall and the cover insulation wall are made of asbestos, and between an upper end side of the housing insulation wall and a corresponding cover insulation wall, an inlet end and an outlet end of a supply pipe for transporting a working fluid are guided. It is characterized in that the pipe installation grooves are formed respectively.

Preferably, the cover is bolted along the upper outer circumferential surface of the heating furnace housing, and the temperature sensing means is preferably made of a thermocouple using thermoelectric power.

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 fluid heating apparatus according to an embodiment of the present invention, Figure 3 is a cross-sectional view of a fluid heating apparatus according to an 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 to 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.

Molding surfaces 9 and 11 of the tube material 10 are formed on the inner surfaces of the upper mold 3 and the lower mold 1 that are equal to each other.

And corresponding to both ends of the tube material 10, the left and right hydraulic cylinders 5 are disposed at both sides of the lower mold 1, respectively, 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 high temperature working fluid in the axial direction, respectively.

In addition, one side of the supply pipe (L) is operated from the hydraulic oil tank (TK) by the driving of the hydraulic oil pump (P) on one side so as to supply a high temperature working fluid to the inside of the tube material (10) through the sealing punch (7). The fluid heating device HU of the present invention is provided so as to receive the fluid and heat the working fluid in the supply pipe L to a high temperature up to a set temperature.

That is, the configuration of the fluid heating device (HU) according to the present embodiment, as shown in Figures 2 and 3, one side of the supply pipe (L) for supplying the working fluid to one side of the sealing punch (7) Is wound several times in a coil shape to form a heating pipe portion HL.

At this time, the heating pipe HL is bent the inlet end (P1) of the supply pipe (L) to the bottom, and then wound up from the bottom to the upper end of the supply pipe (L) P2 of the inlet end ( It is preferable to form adjacent to P1).

And the heating furnace housing 21 is comprised so that the said heating piping part HL may be accommodated.

The furnace housing 21 is formed in a hollow cylindrical shape, the upper portion is formed to open, and integrally forms a flange 23 having a bolt hole along the outer peripheral surface of the upper end.

In addition, a housing insulation wall 25 is formed inside the furnace housing 21, and the housing insulation wall 25 is constant along the bottom surface F1 and the inner circumferential surface F2 of the furnace housing 21. It is configured by forming a wall with a thickness, and is formed by forming a heating space (HS) therein so that the heating pipe HL is positioned in a non-contact state.

Here, the housing insulation wall 25 is preferably made of asbestos material.

In addition, a cover 27 having a disc shape is mounted on an upper portion of the furnace housing 21, and the cover 27 is a flange 23 of the furnace housing 21 while covering the upper portion of the furnace housing 21. ) Is fastened with bolts (B) along the circumference.

In addition, the cover insulation wall 29 is formed on the inner surface of the cover 27 to form a wall of a predetermined thickness is in close contact with the upper peripheral surface of the housing insulation wall 25.

Here, the cover heat insulating wall 29 is preferably made of the same asbestos as the housing heat insulating wall 25.

In addition, an inlet end P1 and an outlet end P2 of the supply pipe L for the transfer of the working fluid are guided between the upper end side of the housing insulation wall 25 and the cover insulation wall 29 corresponding thereto. Piping installation grooves 31 are formed, respectively.

As shown in FIG. 4, the heating coil 33 is wound around the housing insulation wall 25 at regular intervals along the circumference of the housing insulation wall 25, and the heating coil 33 is formed. It is electrically connected to the external controller 20 to generate heat to a predetermined temperature according to the control signal of the controller 20 to supply heat energy to the heating space (HS).

In addition, a thermocouple 35 is mounted to a central side of the cover 27 as a temperature sensing means, and the thermocouple 35 penetrates through the cover insulation wall 29 to be in contact with the heating space HS. Using the thermoelectric power, the internal temperature of the heating space (HS) is detected and the signal is output to the controller 20.

On the other hand, a connector 37 for connecting the wires is configured on the outer side of the furnace housing 21 to electrically connect the heating coil 33 and the thermocouple 35 to the controller 20.

Therefore, in the fluid heating device HU having the above-described configuration, the working fluid to be supplied with the molding liquid pressure passes through the heating pipe HL to the inside of the tube material 10 to be molded through the one-side sealing punch 7. During the heating, the heating coil 33 is heated without direct contact with the heat source through the air inside the heating space HS of the housing insulation wall 25 heated by the heat generated by the heating coil 33.

Accordingly, the heating fluid HL of the supply pipe L is arranged in a non-contact state with the heat source in the process of warming the working fluid to a high temperature by the fluid heating device HU according to the present embodiment to boil the fluid. The phenomenon disappears.

The heating temperature control of the working fluid is a temperature signal in the heating space (HS) detected by the thermocouple 35 according to the flow rate of the working fluid pumped from the working oil pump (P) and conveyed through the supply pipe (L). When output to the controller 20, the controller 20 is output by controlling the electrical signal to the heating coil 33 in accordance with the temperature signal is made by maintaining the temperature in the heating space (HS) in the set range.

As described above, according to the fluid heating apparatus for a warm hydraulic forming system according to the present invention, a high temperature working fluid for forming the expandable hydraulic molding by securing the formability in warm using the elongation characteristic according to the temperature of the aluminum alloy tube material Heating pipe formed in the supply pipe is heated without direct contact with the heating coil, which is a heat source, in the heating space formed inside the housing insulation wall of the furnace housing to prevent boiling of the working fluid, thereby extending the life of the working fluid. It is effective to extend.

In addition, the controller controls the operation of the heating coil according to the flow rate of the working fluid pumped from the working oil pump and conveyed through the supply pipe and the temperature in the heating space detected by the thermocouple, thereby enabling automatic fluid temperature control. have.

Claims (6)

In the fluid heating device for a warm hydraulic forming system, A heating pipe part formed by winding one side of a supply pipe for supplying a working fluid to one side of the sealing punch in a coil shape; A furnace housing formed in a cylindrical shape to receive the heating pipe, and having an upper portion opened; A housing insulation wall forming a wall along a bottom surface and an inner circumferential surface of the heating furnace housing and having a heating space formed therein so that the heating pipe portion is positioned in a non-contact state; A cover mounted to cover an upper portion of the heating furnace housing; A cover insulating wall formed on the inner surface of the cover with a predetermined thickness and in close contact with the housing insulating wall; A heating coil configured to be wound around the inside of the housing insulation wall at a predetermined interval and generate heat up to a predetermined temperature according to a control signal of a controller; And a temperature sensing means mounted on one side of the center of the cover to penetrate the cover insulating wall to detect the temperature inside the heating space and outputting a signal to the controller. Fluid heating device for hydraulic forming system. The method of claim 1, And a connector for connection of a wire for electrically connecting the heating coil and the temperature sensing means and a controller to one side of an outer surface of the furnace housing. The method of claim 1, The housing insulation wall and the cover insulation wall is a fluid heating device for a warm hydraulic forming system, characterized in that the material is made of asbestos. The method of claim 1, Fluid heating for the warm hydraulic forming system, characterized in that the pipe installation grooves are formed between the upper end side of the housing insulation wall and the cover insulation wall corresponding thereto to guide the inlet and outlet of the supply pipe for the transfer of the working fluid. Device. The method of claim 1, The cover is a fluid heating device for a warm hydraulic forming system, characterized in that the bolt is fastened along the outer peripheral surface of the upper housing. The method of claim 1, The temperature sensing means is a fluid heating device for a warm hydraulic forming system, characterized in that consisting of a thermocouple using a thermoelectric power.

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