KR102431615B1 - Hydro forming Molding Apparatus for Air Suspension Cylinder Forming - Google Patents

Abstract

The present invention relates to a hydro forming molding apparatus for molding an air suspension cylinder using heating and rapid cooling methods, which is able to efficiently mold air suspension cylinder materials by sealing and extending the air suspension cylinder materials by heating and rapid cooling methods, comprising: a heating mold unit including an upper mold forming an upper molding unit in a shape for molding a cylinder, a lower mold placed on a lower side of the upper mold to be correspondingly combined, and forming a lower molding unit in a shape for molding a cylinder, and a heating unit embedded in the upper mold and the lower mold, and heating around the upper molding unit and the lower molding unit, and heating the cylinder materials; and a rapid cooling molding unit including a pressurizing punch movable forward/backward toward the upper/lower molding units from a rear side of the heating mold unit, and having a tapered compression head for pressurizing and coming in contact with the entrance of the cylinder materials and sealing the entrance on the front side, and a high-pressure water pipe extension unit penetrating the pressurizing punch and extending the cylinder materials by spraying high-pressure water into the cylinder materials after the entrance of the cylinder materials is sealed in accordance with the pressurization and contact by the pressurizing punch.

Description

Hydroforming Molding Apparatus for Air Suspension Cylinder Forming for Air Suspension Cylinder Forming Using Heating and Rapid Cooling Method

The present invention relates to a hydroforming molding apparatus for forming an air suspension cylinder using a heating and quenching method, and more particularly, to an air suspension cylinder material for efficiently forming an air suspension cylinder material by expanding it by heating and quenching together with a sealing method. It relates to a hydroforming molding apparatus for forming an air suspension cylinder using a heating and quenching method that can be used.

In general, hydroforming technology is emerging as one of the technologies that can obtain high-quality parts with higher strength and rigidity than stamping technology.

This hydroforming technology is largely divided into tube hydroforming and plate hydroforming. Among them, in the case of tube hydroforming, a steel pipe or aluminum extrusion pipe manufactured by roll forming is used as a material. , by placing a hollow hollow product inside a preforming die to form it close to the final shape, and then applying pressure using a liquid to the inside of the hollow product, even a complex shape with a desired shape can be easily manufactured.

On the other hand, the vehicle's suspension system is a device that connects the vehicle body and the wheel, providing a comfortable ride and driving convenience by controlling the shaking of the vehicle body, as well as securing the stability of the vehicle during turning and braking. will do

The suspension system of such a vehicle has mainly used a spring method in the prior art. In this case, if the elasticity of the spring is soft, the riding comfort is improved, and if the spring is hard, the adjustment stability is improved. There was a limitation that the adjustment stability could not be easily adjusted.

Accordingly, a high-function air suspension that uses air to control the air pressure while using air is provided for the suspension system, which satisfies ride comfort and adjustment stability at the same time and makes it easy to adjust. Therefore, the cost is high, and there is a problem that the weight burden of the vehicle is increased by adding a complicated structure such as a valve for the air suspension.

In order to improve such a problem, domestic technology has led to the development of an air suspension for a vehicle, and in particular, in order to reduce the weight of the cylinder of the air suspension, it is intended to be molded and manufactured using an aluminum material.

This air suspension cylinder is manufactured by a secondary molding process of forming an aluminum material by a rear extrusion method and then expanding it by a molding device to which a hydroforming technology is applied.

Looking at the structure of a conventional hydroforming molding apparatus with reference to FIGS. 1 and 2, the cylinder material (S) made of aluminum formed by the rear compression method in the molding part 3 of the upper/lower molds 1 and 2 ), the inlet 110 of the cylinder material (S) is molded by the tapered inclined portion (4a) at the tip of the pressure punch (4) that moves back and forth by the hydraulic cylinder (5) in the mold and material heating state after the mold is combined. After sealing with pressure and close contact with the inclined surface 3a of the inlet of the molding part, the cylinder material is expanded by expansion pressure by nitrogen gas filling into the cylinder material (S) to form forming, and the cylinder formed after opening the mold is extracted and manufactured. .

However, in the conventional hydroforming molding apparatus described above, the pressure punch does not control the pressure adhesion force that pressurizes the inlet of the tapered inclined symbol cylinder material by the hydraulic cylinder, and the inlet of the cylinder material is pressurized to a too good thickness and pressed while the mold and the pressure punch are pressed. There were problems such as poor sealing function and poor molding of the cylinder material as well as the process of separating it from the mold or pressurized punch not smoothly due to the deformation caused by the pressure. In particular, during the sealing process of the pressure punch, heat from the mold and the cylinder is transferred to the pressure punch and the temperature of the pressure punch rises, so when the pressure punch seals the inlet of the cylinder material, the cylinder material is further pressed, resulting in product molding defects. Of course, there was a problem that the workability was lowered and the quality was deteriorated.

In addition, in the prior art, when the upper mold is lifted and molded after forming by expanding the cylinder material, the mold and the molded cylinder product itself are high temperature, so the operator manually cools the molded cylinder product using an air hose. There was a problem in that it was difficult to produce a good product as part of the product was deformed during the extraction process if the product was not cooled evenly as a whole, causing a decrease in productivity as well as workability.

KR Registered Patent Publication No. 10-1677290 (2016.11.11.) KR Registered Patent Publication No. 10-1641786 (2016.07.15.)

The present invention is to solve the above problems, and since the air suspension cylinder material for a vehicle is formed to be expanded by a rapid cooling method using high-pressure water with sealing in a heated state, it is possible to improve the workability while improving the molding defect and quality deterioration of the product. An object of the present invention is to provide a hydroforming molding apparatus for forming an air suspension cylinder using a heating and rapid cooling method capable of increasing productivity.

Hydroforming molding apparatus for air suspension cylinder molding using heating and quenching method proposed by the present invention is provided with an upper mold forming an upper molding part of a shape for cylinder molding, and moldable corresponding to the lower part of the upper mold, but the cylinder A lower mold forming a lower molding part having a shape for molding, and a heating unit embedded in the upper mold and the lower mold to generate heat around the upper mold and the lower mold to apply heat to the cylinder material. a heating mold part; A pressure punch having a tapered compression head capable of moving forward and backward in a straight line from the rear of the heating mold part toward the upper/lower molding part, but capable of sealing the inlet of the cylinder material by pressing and close contact with the front, and penetrating the pressure punch and forming the pressure punch and a rapid cooling forming unit comprising a high-pressure harvesting pipe unit capable of expanding the cylinder material by spraying high-pressure water into the cylinder material after sealing according to the pressure adhesion of the cylinder material.

The heating unit of the heating mold part is formed to extend in the longitudinal direction of the upper/lower molding part, but a heating rod configured to be provided with a plurality of spaced apart in the circumferential direction of the upper/lower molding part, and a plurality of the heating rods to configure a temperature control means for setting and controlling the temperature.

The press punch of the rapid cooling forming part includes a guide part forming a guide surface of a straight path at the rear of the tapered compression head for linear movement back and forth on the heating mold part, an inclined surface of the tapered compression head and a guide surface of the guide part It has a stepped jaw that forms a step between the two.

The high-pressure harvesting pipe unit of the rapid cooling forming part extends in a straight direction in response to the pressure punch and forms a high-pressure water supply path for supplying high-pressure water, and high-pressure water in response to the taper compression head among the pressure punches. It constitutes a spray nozzle that ejects strongly.

The injection nozzle includes a main injection nozzle that communicates with the high-pressure water supply path and sprays high-pressure water in a straight direction, and a rapid cooling that communicates with the high-pressure water supply path but extends in an oblique direction to correspond to the inclined surface of the taper compression head. A spray nozzle is provided.

According to the hydroforming molding apparatus for air suspension cylinder molding using the heating and quenching method according to the present invention, while maintaining the heating state of the cylinder material around the molding part, sealing by pressurization by a pressure punch, and rapid cooling and cooling due to high pressure water Since it is configured to expand the tube, excellent workability and productivity are promoted, and mold defects of the product are prevented, thereby promoting the production of good products, as well as improving the quality of the product.

1 is a cross-sectional configuration diagram showing a conventional hydroforming molding apparatus.
Figure 2 is a molding process diagram according to Figure 1;
3 is a cross-sectional configuration diagram showing an embodiment according to the present invention.
4 is a side cross-sectional view showing a heating mold part in an embodiment according to the present invention.
5 is a cross-sectional view showing another embodiment of the heating mold part in one embodiment according to the present invention.
6 is a cross-sectional view showing a rapid cooling forming part in an embodiment according to the present invention.
7 is a perspective view showing a pressure punch in an embodiment according to the present invention;

The present invention provides an upper mold for forming an upper molding part of a shape for cylinder molding, a lower mold for forming a lower molding part having a shape for cylinder molding, the upper mold and a heating mold part embedded in the lower mold and configured to include a heating unit for applying heat to the cylinder material by generating heat around the upper mold part and the lower mold part; A pressure punch having a tapered compression head capable of moving forward and backward in a straight line from the rear of the heating mold part toward the upper/lower molding part, but capable of sealing the inlet of the cylinder material by pressing and close contact with the front, and penetrating the pressure punch and forming the pressure punch Hydro for air suspension cylinder molding using heating and rapid cooling method including; It is characterized by the technical configuration of the forming molding device.

Next, a preferred embodiment of the hydroforming molding apparatus for forming an air suspension cylinder using a heating and quenching method according to the present invention will be described in detail with reference to the drawings.

First, as shown in FIG. 3 , an embodiment of a hydroforming molding apparatus for forming an air suspension cylinder using a heating and quenching method according to the present invention includes a heating mold part 100 and a rapid cooling molding part 200 . .

As shown in FIG. 3 , the heating mold part 100 is a mold structure that creates a molding work area so that the aluminum cylinder material (S) can be molded by the quench molding part 200, and the upper mold 110 ) and a lower mold 120 are provided.

The upper mold 110 is configured to be movable in a vertical direction corresponding to the upper side of the lower mold 120 , and an upper molding part 111 having an intaglio shape for cylinder molding corresponding to the lower mold 120 . ) to form

The lower mold 120 forms a moldable structure corresponding to the lower portion of the upper mold 110 , and forms a lower molding part 121 having an intaglio shape for cylinder molding. That is, the cylinder material (S) in the upper molding part 111 and the lower molding part 121 is positioned in a fixed state to form a product-shaped molding frame for forming molding of the cylinder material (S).

At the inlets of the upper molding part 111 and the lower molding part 121 , an inclined surface for sealing the quench molding part 200 is formed. That is, the sealing portion of the cylinder material (S) is formed to contact and support when the cylinder material (S) is pressed into contact with the quench forming unit ( 200 ).

A heating unit 130 is configured in the heating mold part 100 to apply heat to the cylinder material S at a set temperature.

As shown in FIGS. 3 and 4, the heating unit 130 is embedded in the upper mold 110 and the lower mold 120, and the upper molded part 111 and the lower molded part 121 are installed. It is configured to be able to generate heat in the vicinity adjacent to the

The heating unit 130 includes a plurality of heating rods 131 embedded in the upper mold 110 and the lower mold 120 to form heat generation, and a temperature corresponding to the plurality of heating rods 131 . Configures the temperature control means 133 to control the setting.

The heating rod 131 is formed to extend in the longitudinal direction to the upper molded part 111 and the lower molded part 121 , respectively, in the circumferential direction of the upper molded part 111 and the lower molded part 121 . Arranged so as to have a plurality of them at regular intervals.

The temperature control means 133 flexibly sets and controls the heating temperature of the heating rod 131 . That is, it is possible to create an optimal foaming molding environment by flexibly setting and controlling the temperature according to the molding thickness or type of the cylinder material (S), which is a forming molding target.

In addition, as shown in FIG. 5 , the heating mold part 100 has a thermoelectric member 140 for intensively transferring the heat of the heating rod 131 toward the upper molded part 111 and the lower molded part 121 . ) is also possible to further include.

The thermoelectric member 140 is configured to be positioned closer to the upper molded part 111 and the lower molded part 121 than the heating rod 131 .

The thermoelectric member 140 is configured to be partially provided in the entire section of the upper molded part 111 and the lower molded part 121 by limiting it to a direct non-contact section with the quick cooling part 200 . That is, since the thermoelectric member 140 is provided in response only to the molding area expanded by the high-pressure water of the rapid cooling molding unit 200 excluding the sealing portion of the cylinder material (S), the sealing of the cylinder material (S) is provided. It is possible to achieve smooth pipe expansion by the pressure of high-pressure water while preventing excessive deformation of the part.

As a material usable as the thermoelectric member 140 in the above, it is configured by applying a tungsten copper alloy, etc., which has better thermal conductivity than general cast iron.

The rapid cooling forming unit 200 performs a function of sealing the inlet of the cylinder material (S) and expanding the tube at the same time.

As shown in FIGS. 3 and 6 , the rapid cooling forming unit 200 includes a pressure punch 210 provided to seal the inlet of the cylinder material S by pressure and high pressure into the inside of the cylinder material S. By spraying water, the high-pressure harvesting pipe unit 220 capable of expanding the cylinder material (S) to form forming is configured.

The pressure punch 210 moves linearly back and forth toward the upper and lower molding parts 111 and 121 of the upper and lower molds 110 and 120 that are vertically molded from the rear of the heating mold part 100 . possible drive structures. That is, the pressure punch 210 is provided with a hydraulic cylinder 217 is configured to be movable forward and backward linearly.

As shown in FIGS. 6 and 7, the pressure punch 210 directly contacts the inlet of the cylinder material (S) at the front end corresponding to the heating mold part 100 and is in direct contact with the taper compression head 211. and a guide portion 213 that forms a guide surface of a straight path at the rear of the tapered compression head 211 .

The tapered compression head 211 forms an inclined surface for sealing contact of the cylinder material (S).

In the pressing punch 210 , a stepped jaw 215 is formed at the boundary between the tapered compression head 211 and the guide part 213 .

Since the stepped jaw 215 forms a step between the inclined surface of the tapered compression head 211 and the guide surface of the guide part 213 , the cylinder material inlet is formed by the stepped jaw 215 into the upper/lower forming part. (111) (121) Sealing is performed while reducing the thickness of the pressure-adhesive to the inclined surface of the inlet. That is, the step 215 is formed to a depth smaller than the thickness of at least the cylinder material (S), and in consideration of the thickness of the cylinder material (S), depending on the depth of the step step (215) of the cylinder material (S). It is possible to adjust the thickness of pressing the inlet.

In the pressure punch 210 , the taper compression head 211 may be integrally formed with the guide part 213 , and is detachable from the guide part 213 , so that the taper is a detachable type having a structure that can be replaced at any time. It is also possible to configure the compression head 211 .

The high-pressure harvesting pipe unit 220 has a structure in which the cylinder material S is expanded by spraying high-pressure water into the cylinder material S after sealing according to the pressure adhesion of the pressure punch 210 .

As shown in FIG. 6 , the high-pressure harvesting pipe unit 220 has a structure capable of injecting high-pressure water toward the cylinder material S by penetrating the pressure punch 210, and includes a high-pressure water supply path 221 and The injection nozzle 223 is constituted.

The high-pressure water supply path 221 is formed to extend in a straight direction corresponding to the pressure punch 210 and is formed so as to supply high-pressure water. That is, the high-pressure water supply path 221 serves to supply high-pressure water to the injection nozzle 223 and at the same time cools the pressure punch 210 by itself.

The injection nozzle 223 is formed to correspond to the taper compression head 211 of the pressure punch 210, and the inside of the cylinder material S located in the upper/lower molding parts 111 and 121. The high-pressure water is strongly ejected toward the

The injection nozzle 223 communicates with the high-pressure water supply path 221 and communicates with the main injection nozzle 223a for spraying the high-pressure water in a straight direction, and the high-pressure water supply path 221, but the taper compression head ( 211) to form a rapid cooling injection nozzle (223b) extending in an inclined direction to correspond to the inclined surface.

The rapid cooling injection nozzle 223b ejects high-pressure water of strong pressure in the cylinder material S together with the main injection nozzle 223a and at the same time comes in contact with the sealing surface of the cylinder material S among the pressure punches 210. The tapered compression head 211 is rapidly cooled while flowing along the inclined surface of the tapered compression head 211 .

Briefly looking at the operating relationship of the present invention as described above, the cylinder material ( After positioning S), the upper mold 110 and the lower mold 120 are mold-coupled, but heat is applied to the cylinder material (S) due to the heat generated by the heating unit 130, and the press punch ( 210) advances the sealing operation to press and close the inlet of the cylinder material (S), but the taper pressing head 211 of the pressure punch 210 closes the inlet of the cylinder material (S) to the upper molding part 111 and The lower molding part 121 is sealed while pressurized and closely adhered to the inclined surface, and in the quench molding part 200, high-pressure water in the cylinder material is sprayed from the high-pressure harvesting pipe unit 220 at the same time as sealing by the pressure punch 210. Thus, the entire sealing portion of the cylinder material (S) as well as the cylinder material (S) is rapidly cooled and an outward expansion pressure is applied to the cylinder material (S), so that the shape of the upper molding part 111 and the lower molding part 121 is affected. It is custom-expanded and formed by forming.

That is, according to the hydroforming molding apparatus for forming an air suspension cylinder using the heating and quenching method according to the present invention configured as described above, while maintaining the heating state of the cylinder material around the forming part, sealing by pressurization by a pressure punch and At the same time, it is composed of rapid cooling and pipe expansion by high-pressure water, so it is possible to improve the quality of the product as well as promote the production of good products by preventing the molding defect of the product while promoting excellent workability and productivity.

In the above, a preferred embodiment of a hydroforming molding apparatus for forming an air suspension cylinder using a heating and quenching method according to the present invention has been described, but the present invention is not limited thereto. It is possible to carry out various modifications within the scope, and this also falls within the scope of the present invention.

100: heating mold part 110: upper mold
111: upper molded part 120: lower mold
121: lower molding unit 130: heating unit
131: heating rod 133: temperature control means
140: thermoelectric member 200: quick cooling forming part
210: pressure punch 211: taper compression head
213: guide part 215: stepped jaw
217: hydraulic cylinder 220: high pressure harvesting pipe unit
221: high pressure water supply path 223: injection nozzle
223a: main injection nozzle 223b: rapid cooling injection nozzle
S: Cylinder material

Claims (5)

An upper mold forming an upper molding part having a shape for cylinder molding, a lower mold provided to correspond to the lower part of the upper mold and forming a lower molding part having a shape for cylinder molding, the upper mold and the lower mold a heating mold part embedded in a heating mold unit including a heating unit that heats the cylinder material by generating heat around the upper molding part and the lower molding part;
A pressure punch having a tapered compression head capable of moving forward and backward linearly from the rear of the heating mold part toward the upper molding part and the lower molding part, but sealing the inlet of the cylinder material by pressing and close contact with the front, and penetrating the pressure punch; Air suspension using a heating and rapid cooling method comprising a; a rapid cooling molding unit comprising a high-pressure harvesting pipe unit capable of expanding the cylinder material by spraying high-pressure water into the cylinder material after sealing according to the pressure adhesion of the pressure punch A hydroforming molding device for cylinder molding, comprising:
An inclined surface is formed at the inlet of the upper molding part and the lower molding part to support the sealing contact when the taper pressing head of the pressure punch of the quench molding part is in press contact,
The heating unit of the heating mold part is formed to extend in the longitudinal direction of the upper molded part and the lower molded part, and a heating rod configured to be provided with a plurality of spaced apart in the circumferential direction of the upper molded part and the lower molded part, and a plurality of the heating parts Consists of including a temperature control means for setting and controlling the temperature in response to the rod,
A tungsten copper alloy material having superior heat conduction than cast iron for intensively transferring heat of the heating rod toward the upper and lower molded parts and disposed adjacent to the upper and lower molding parts than the heating rod in the heating mold part of the thermoelectric member, wherein the thermoelectric member is disposed in a portion corresponding to only the molding area expanded by the high-pressure water of the rapid cooling molding part and pressurizes and closes the inlet of the cylinder material to seal the cylinder by a tapered compression head. It is made to prevent excessive deformation of the sealing part of the material,
The press punch of the rapid cooling forming part includes a guide part forming a guide surface of a straight path at the rear of the tapered compression head for linear movement back and forth on the heating mold part, an inclined surface of the tapered compression head and a guide surface of the guide part Including a step step to form a step between the steps, the step step is made adjustable to form a depth smaller than the thickness of the cylinder material,
A hydroforming molding apparatus for air suspension cylinder molding using a heating and quenching method, wherein the taper pressing head of the pressure punch is separable from the guide part and is of a separable type having a structure that can be replaced at any time.
delete delete The method according to claim 1,
The high-pressure harvesting pipe unit of the rapid cooling forming part extends in a straight direction in response to the pressure punch and forms a high-pressure water supply path for supplying high-pressure water, and high-pressure water in response to the taper compression head among the pressure punches. A hydroforming molding device for air suspension cylinder molding using a heating and rapid cooling method including a strong jetting nozzle.
5. The method according to claim 4,
The injection nozzle includes a main injection nozzle that communicates with the high-pressure water supply path and sprays high-pressure water in a straight direction, and a rapid cooling that communicates with the high-pressure water supply path but extends in an oblique direction to correspond to the inclined surface of the taper compression head. Hydroforming molding device for air suspension cylinder molding using heating and quenching method including injection nozzle.

Images