KR100542949B1 - Tube hydroforming method for reduction of bending process - Google Patents

Abstract

The present invention relates to a bending tube hydroforming method, comprising: fixing a point to be a reference point when the tube is mounted on a mounting guide and bent in a mold; and in a direction perpendicular to the direction in which the upper mold for hydroforming presses. Bending the tube by applying a force to close the lower mold, closing the upper mold to close the lower mold, and mounting the shaft feed cylinder and acting hydraulic pressure in the tube to hydraulically mold the product, Production time and cost can be greatly reduced by performing the most time-consuming bending process or parts of the process in a hydroforming mold.

Tube hydroforming, upper mold, lower mold, side cylinder, bending

Description

TUBE HYDROFORMING METHOD FOR REDUCTION OF BENDING PROCESS}

1 is an exemplary view of a hydroforming part shape;

2 is a block diagram showing a hydroforming apparatus according to the present invention,

Figure 3 is a schematic diagram showing a process of bending the material in the hydroforming mold according to the present invention, and

Figure 4 is a schematic diagram showing a closing state of the mold just before pressing in hydroforming according to the present invention.

<Explanation of symbols for main parts of the drawings>

1: hydroforming press upper bolster

2: hydroforming press lower bolster

3: upper mold 4: passing position groove of the side cylinder rod

5: side cylinder 6: lower mold

7: Hydroforming Tube 8: Tube Positioning Guide

9: Cavity in Hydroforming Mold

The present invention relates to a tube hydroforming method capable of reducing a bending process, and more particularly, to a tube hydroforming method of performing bending in a direction perpendicular to a press load direction in a closing process of a mold using a hydroforming mold. .

Currently, molding by the hydroforming method is generally performed in the order of bending, preforming, hydroforming, and post-treatment. In the bending process, the tube is bent by using a CNC bending machine, and in the preforming process, the tube can be mounted on a hydroforming mold while as close as possible to the designed product shape using a general stamping press. In the process, a tube is mounted in a cavity in a hydroforming mold to close the mold, and then the fluid is filled into the tube and pressurized to form a final product. In most cases the bending of the tubes takes place during the bending process.

However, the bending process takes the most processing time among the series of product forming processes (bending-preforming-hydroforming) by the hydroforming method, and when there are many bending parts, the cycle time of the hydroforming method increases, that is, the productivity is increased. There is a problem that greatly drops.

Therefore, in order to solve this problem, two or more bending machines are installed per hydroforming, or an expensive bending machine is installed, which solves the problem of raising the production cost.

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It is an object of the present invention to solve the above problems is to provide a method configured to greatly reduce the production time and cost by performing a bending process or a part of the process in a hydroforming mold.

In order to solve the object as described above, the present invention is a vertical reciprocating motion of the vertical mold and the side cylinders on both sides flow in a direction perpendicular to the flow direction of the upper mold, respectively, between A hydroforming device comprising a detachable lower mold in which a tube for bending and hydroforming is mounted in a cavity to be formed, the hydroforming device comprising: mounting a tube over a predetermined mounting guide and fixing a point to be a reference point when bending in the lower mold And bending the tube while closing the lower mold by applying a force in a direction perpendicular to the pressing direction of the upper mold, closing the upper mold to close and engage with the lower mold, and the shaft supply cylinder. Is mounted and hydraulic pressure acts on the tube to hydraulically mold the product. The.

In other words, the product is mounted in a hydroforming mold and the bending force can be added to the tube at the same time as the mold is closed by using the power of the side cylinder.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the case where it is determined that the gist of the present invention may be unnecessarily obscured, the detailed description thereof will be omitted.

Figure 2 is a block diagram showing a hydroforming apparatus according to the present invention, Figure 3 is a schematic diagram showing a process of bending the material in the hydroforming mold according to the present invention, Figure 4 is pressurized in hydroforming according to the present invention It is a schematic diagram which shows the closing state of the immediately previous mold.

As shown in Figs. 2 to 4, the apparatus includes a lower mold in which an upper bolster 1 of a hydroforming press, a lower bolster 2, and a cavity 9 of a hydroforming product shape are processed to form a product directly. (6), and the upper mold (3) and the hydroforming tube (7) to support the deformation caused by the hydraulic pressure acting on the lower mold from the outside, and the initial tube position in the tube mounting step to be the same position every product molding In the direction perpendicular to the direction in which the hydroforming upper mold presses the tube positioning guide (8) and the lower mold, which hold the tube at one side, which is the reference point at the beginning of the bending force, so that the position does not change during bending. Between the side cylinder (5), which moves to provide the power to bend in the mold, and allows the rod of the side cylinder to pass through the upper mold; It consists of a cylinder passage position groove 4.

In the present invention, by making the upper groove of the side cylinder rod in the upper mold, the upper mold is lowered immediately before the lower mold is closed, thereby minimizing the increase in cycle time in the hydroforming process, and tapered on the surface where the upper mold and the lower mold contact each other. A small slope was added to increase the lateral fastening force of the lower mold as the upper mold was closed. A sliding guide was installed between the lower mold and the lower bolster to easily and accurately move the lower mold.

Apparently, there are many ways to modify these embodiments while remaining within the scope of the claims. In other words, there may be many other ways in which the invention may be practiced without departing from the scope of the following claims.

Tube hydroforming method for reducing the bending process according to the present invention can significantly reduce the production time and cost by performing a bending process or a part of the process in the hydroforming mold that takes the most time in the hydroforming component manufacturing method It has an effect.

Claims (2)

Separated lower part which flows in the direction perpendicular to the flow direction of the said upper mold by the upper mold which reciprocates vertically, and the side cylinder of both sides, and the tube for bending and hydroforming is mounted in the cavity formed between them, respectively. In a hydroforming apparatus comprising a mold, Mounting a tube over a predetermined mounting guide and fixing one point which becomes a reference point when bending in the lower mold; Bending the tube while closing the lower mold by applying a force in a direction perpendicular to the pressing direction of the upper mold; Closing the upper mold by lowering and engaging the lower mold; And A method of hydroforming a tube, comprising: mounting an axial feed cylinder and hydraulically acting in the tube to hydraulically mold the product. The method of claim 1, The tube hydroforming method for reducing the bending process, characterized in that the inclined tapered to the upper mold to improve the transverse mold clamping force by the wedge action on the lower mold.

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