KR200368378Y1 - Z bending die - Google Patents

Abstract

The present invention relates to a mold apparatus for stair bends, comprising: a base frame; A lower mold provided on an upper surface of the base frame and having a Z-shaped step portion at a lower end thereof; Buffer means interposed between the base frame and the lower mold; An upper mold provided at an upper portion of the lower mold and having a Z shape symmetrical with a Z-shaped step portion of the lower mold; By including a press unit connected to the upper mold, it is possible to perform a Z-shaped staircase at a time has the effect of maximizing the work productivity.

Description

Molding apparatus for stair bend {Z BENDING DIE}

The present invention relates to a stair bend mold apparatus that can process a Z-shaped step difference by a primary bending process.

Bending is a process of bending a thin metal sheet along a bending line to cause permanent deformation and bending it to a desired shape. Compression stresses occur inside the bend and tensile stresses outside, and due to the inherent elasticity of the material, complete plastic deformation is difficult. In the case of bending a fine size shape, it is classified as an ultra-precision shear mold, and in the case of strictly restricting the shape precision tolerance after bending, a precise mold design and manufacture are required.

In bending, springback refers to a phenomenon in which the material is deformed beyond the elastic limit by applying an external force to the material and then partially recovered to its original shape due to residual stress even after removing the external force. In order to obtain a precise product in bending, This is the most difficult phenomenon. Various methods have been devised and used to suppress this, but they cannot be eliminated at the source, but are reduced or predicted and precisely molded.

In general, in order to perform a bending process to form a Z-shaped step difference, since the first and second bending processes must be sequentially performed, a thin metal plate has a problem in that the manufacturing efficiency is not good. .

An object of the present invention devised to solve the above problems is to provide a mold apparatus for a staircase bend that can maximize the productivity of the bending process.

An object of the present invention, the base frame; A lower mold provided on an upper surface of the base frame and having a Z-shaped step portion at a lower end thereof; Buffer means interposed between the base frame and the lower mold; An upper mold provided at an upper portion of the lower mold and having a Z shape symmetrical with a Z-shaped step portion of the lower mold; It can be achieved by a mold apparatus for a staircase bend comprising a press portion connected to the upper mold.

Preferably, the upper end of the upper mold of the present invention is fastened to be detachable with the lower end of the press.

Preferably, the Z-shaped stepped portions formed in the upper mold and the lower mold of the present invention are each formed of a first stepped surface, a second stepped surface, and a third stepped surface, and the first and third stepped surfaces are It consists of an acute angle θ ₁ and θ ₃ , and the stepped surface is formed at an obtuse angle θ ₂₁ and θ ₂₂ .

1 is a front view schematically showing a mold apparatus for a stair bend according to an embodiment of the present invention.

FIG. 2 is a front view schematically showing an operating state of the mold apparatus for staircase bends in FIG. 1; FIG.

<< Explanation of symbols for main part of drawing >>

10: base frame

20: lower mold

21, 23, 25: stepped surface

30: buffer means

31: cushioning shaft 33: spring

35: insertion hole

40: upper mold

41, 43, 45: stepped surface

50: press section

200: bending device

300 moldings

Hereinafter, the configuration of the present invention with reference to the drawings in detail.

FIG. 1 is a front view schematically showing a stair die mold apparatus according to an embodiment of the present invention, and FIG. 2 is a front view schematically showing an operating state of the FIG. 1 step die mold apparatus.

1 and 2, the stair bend mold apparatus according to the present invention is provided with a base frame 10 and a lower mold 20 provided with an upper surface of the base frame and having a Z-shaped step portion at a lower end thereof; A cushioning means 30 interposed between the base frame 10 and the lower mold, and a Z-shape provided at the upper portion of the lower mold 20 and symmetrical with the Z-shaped stepped portion of the lower mold 20 at the lower end thereof. The upper mold 40 formed and the press part 50 connected to the upper mold 40 are comprised.

Here, the base frame 10 is typically firmly fastened to the base upper surface of the bending device 200.

The lower mold 20 is provided on the upper surface of the base frame 10 and provided to the buffer means 30 to disperse the impact during the bending process. Here, the buffer means 30 is provided between the base frame 10 and the lower mold 20, the shock absorbing shaft 31 in the insertion hole 35 formed to communicate the base frame 10 and the lower mold 20. And a spring 33 are provided.

In the upper surface of the lower die 20, a so-called Z-shaped step portion is formed. Here, the stepped portions are divided into first, second and third stepped surfaces 21, 23 and 25, and the first and third stepped surfaces 21 and 25 are each acute angle (θ) with respect to the reference line. ₁ ) (θ ₃ ), and the second stepped surface 23 is formed at an obtuse angle θ ₂₁ (θ ₂₂ ) with respect to the reference line. And the right end part of the 3rd step surface 25 of the lower metal mold | die 20 forms a horizontal surface.

The upper mold 40 is located on the upper side of the lower mold 20 and fastened to be detachable from the lower end of the press part 50.

Here, the lower surface of the upper mold 40 is formed with a stepped portion so as to be symmetrical to each of the Z-shaped stepped portion of the lower mold 20 described above. Here, the stepped portion of the upper mold 40 is divided into first, second and third stepped surfaces 41, 43, 45, and the first and third stepped surfaces 41, 45 are reference lines. each are formed at an acute angle (θ _1), (θ ₃₎ with respect to the second step face 43 is formed at an obtuse angle (θ ₂₁₎ (θ ₂₂₎ with respect to the reference line. The left end of the first stepped surface 41 of the upper mold 40 forms a horizontal plane.

Referring to Figure 2 describes the operating state of the mold apparatus for stair bends of the present invention having the above configuration as follows.

As shown in FIG. 1, the molding 300 is seated on an upper surface of the lower mold 20 in a state where the upper mold 40 and the lower mold 20 are spaced apart from each other.

When the mounting of the molding 300 is completed, the press unit 50 is vertically lowered together with the upper mold 40 at an arbitrary pressure by a control unit (not shown) of the bending apparatus 300.

When the press part 50 is lowered in this way, the step part of the upper mold 40 and the step part of the lower mold 20 are engaged with each other, and the molded product 300 is completed with a Z-shaped stair.

Although the present invention described above has been described with reference to a few embodiments, the present invention is not limited thereto, and the present invention may be easily modified by those skilled in the art. It is obvious that it belongs to the technical idea.

The present invention having the above configuration can perform a step bending, for example, a Z-shaped step bending at a time, there is an advantage that can maximize work productivity.

Therefore, the present invention is a very useful design that can produce a large amount in terms of time and efficiency when mass production is desired.

Claims (3)

A base frame; A lower mold provided on an upper surface of the base frame and having a Z-shaped step portion at a lower end thereof; Buffer means interposed between the base frame and the lower mold; An upper mold provided at an upper portion of the lower mold and having a Z shape symmetrical with a Z-shaped step portion of the lower mold; Step device according to claim 2, characterized in that it comprises a press unit connected to the upper mold. The method of claim 1, The upper end of the upper mold is a staircase mold device, characterized in that the fastening is detachable with the lower end of the press portion. The method of claim 1, The Z-shaped stepped portions formed in the upper mold and the lower mold are each formed of a first stepped surface, a second stepped surface, and a third stepped surface, The first and third stepped surfaces are formed at an acute angle (θ ₁ ) (θ ₃ ), and the second stepped surface is formed at an obtuse angle (θ ₂₁ ) (θ ₂₂ ).