KR101462640B1 - progressive type fine blanking press for manufacturing a product having multilayer and manufacturing method therof - Google Patents

Abstract

The present invention relates to a progressive type fine blanking apparatus for manufacturing a multi-layered product according to a new type which enables a blanked product to be smoothly taken out from a blanked material for a multi-layered product, and a method for manufacturing a multi-layered product using the same.
To this end, the present invention relates to an upper mold comprising a plurality of upper punches provided on a step-by-step basis for multi-layer molding of a material; A lower mold having a plurality of lower punches provided on a step-by-step basis for multi-layer molding of the material while performing relative movement with the upper punches of the upper mold; An insert ring provided at an upper end of the upper mold and at a lower end of the lower mold to provide a pressing force with each of the cushion fins when the material is formed by the relative movement of the respective dies; A pair of movable punches which are positioned at a position corresponding to a non-formed portion of the material among the portions provided with at least one of the upper and lower punches, and grip the non-formed portion of the material; And a hydraulic actuating part provided on each of the insert rings to provide an actuating force for selectively actuating the movable punches by oil pressure, respectively. The present invention also provides a progressive type fine blanking apparatus for manufacturing a multilayered product.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a progressive type fine blanking apparatus and a method for manufacturing the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a progressive fine blanking apparatus, and more particularly, to a progressive fine blanking apparatus which is capable of smoothly taking out a blanked product from a blank during fine blanking of a multi- Type fine blanking apparatus and a method of manufacturing a multi-layer product using the same.

In general, the vehicle seat includes a seat cushion frame on which a seat cushion is mounted, and a seatback frame on which a seatback is mounted. The seat cushion frame and the seatback frame are structured to be adjustable in angle by a seat recliner .

The seat recliner 10 includes a plate holder 11 coupled to a seat cushion frame (not shown) as shown in FIG. 1, a sector gear 12 coupled to a seatback frame (not shown) A shaft 13 and a cover bracket 14 to which a recliner lever (not shown) is coupled at one end and a cam 15 is interposed between the plate holder 11 and the sector gear 12. [ A cam spring 16, and a lock gear 17, respectively.

2 of the accompanying drawings shows the sector gear 12 among the various configurations of the seat recliner 10 described above.

The sector gear 12 is held in such a state that the seatback frame is prevented from being angularly adjusted in the state of being engaged with the lock gear 17, and when the engagement with the lock gear 17 is released, It plays a role.

The sector gear 12 includes a base layer 12a on which gears are formed along an inner circumferential surface of the base gear 12a and a pair of cam gears 16a, And a stopper layer 12c protruding from the upper surface of the cover layer 12b and restricting the range of the reclining angle, (Not shown) provided on the seat back frame, and a coupling protrusion 12d protruding from the upper surface of the seat back 12c and inserted into and coupled with a coupling hole (not shown) provided in the seatback frame.

Accordingly, conventionally, in order to manufacture the sector gear 12, a basic multi-layer structure is formed in a general press die, and precision machining is performed to form a coupling portion between the gear and each component and a coupling protrusion 12d. I have.

However, the process for manufacturing a product having a multi-step structure such as the sector gear 12 as described above has a problem that it takes a long time to manufacture because the press process and the machining process must be sequentially performed.

Of course, it is possible to manufacture a multi-step product using fine blanking. However, for a multi-layered product such as the sector gear 12, it is extremely difficult to form a conventional fine blanking apparatus, Which is a problem in that it can not be achieved.

Furthermore, even if the multilayered product is formed into fine blanking, there is a problem that the multilayered product blanked from the blank can not be smoothly taken out.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a multi-layered product, such as a sector gear, And a method of manufacturing a multilayered product using the same.

According to an aspect of the present invention, there is provided a progressive-type fine blanking apparatus for manufacturing a multi-layered product, comprising: an upper mold having a plurality of upper punches provided for respective steps for forming a multi- A lower mold having a plurality of lower punches provided on a step-by-step basis for multi-layer molding of the material while performing relative movement with the upper punches of the upper mold; An insert ring provided at an upper end of the upper mold and at a lower end of the lower mold to provide a pressing force with each of the cushion fins when the material is formed by the relative movement of the respective dies; A pair of movable punches which are positioned at a position corresponding to a non-formed portion of the material among the portions provided with at least one of the upper and lower punches, and grip the non-formed portion of the material; And a hydraulic actuating part provided on each of the insert rings to provide an actuating force for selectively actuating the movable punches by oil pressure.

Here, the hydraulic actuating part may include a working groove formed in the surface of the insert ring so as to correspond to a position of each movable punch and forming a space to be provided with an oil pressure and forming a working space, And a lower end connected to the movable punches so as to be vertically connected to the upper and lower movable blocks, respectively, and vertically penetrating the respective molds, And a movable pin for selectively pressing each movable punch.

The operating height of the movable punch may be a height of the stepped portion formed in the material in the preceding step.

The upper mold and the lower mold are provided with hydraulic terminals for supplying hydraulic pressure for operation of the hydraulic actuating part, and the respective molds and the respective insert rings are moved from the hydraulic terminal to a space in the operating groove constituting the hydraulic actuating part, And the hydraulic pressure supplied to the hydraulic pressure terminal is transmitted through the hydraulic pressure conduit into the operating groove to force the elevating block to move.

According to another aspect of the present invention, there is provided a method of manufacturing a multi-layer product using a progressive fine blanking apparatus for manufacturing a multi-layer product, including: a first step of transporting a material to a process position; A second step of moving the upper mold downward to perform forming or blanking of the material through a corresponding operation between the upper punch and the lower punch; The upper hydraulic actuating part provided on the upper insert ring and the lower hydraulic actuating part provided on the lower insert ring are operated so that the upper movable punch and the lower movable punch correspond to each other, A third step of gripping the molded part; A fourth step of raising the upper mold when the forming and blanking of the material is completed; When the upper punch and the upper movable punch are moved upward together with the upper mold halfway through the fourth step, the lower movable punch is further elevated through the operation control of the lower hydraulic actuating part to complete the upward movement of the upper mold A fifth step of keeping the multilayered article in a grip state continuously; And a sixth step of simultaneously releasing the upper hydraulic actuating part and the lower hydraulic actuating part of the multi-layered product separated from the workpiece when the upward movement of the upper mold is completed in the fifth step .

As described above, the progressive-type fine blanking apparatus for manufacturing a multilayered product of the present invention has the effect of making it possible to manufacture a multi-layered product of a multi-layer embossing structure using the fine blanking method.

Particularly, the progressive-type blank blanking apparatus for manufacturing a multilayered product of the present invention further comprises a hydraulic actuating part for each of the upper insert ring and the lower insert ring, and each of these hydraulic actuating parts is connected to the third upper punch and the lower third punch So that the product can be smoothly taken out from the blank during the final blanking process even though the product is a multi-stage embossing structure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view illustrating an inner structure of a conventional seat recliner,
2 is a perspective view illustrating a conventional sector recliner sector gear.
3 is an internal state diagram for illustrating a fine blanking apparatus according to an embodiment of the present invention.
FIG. 4 is a state view of the upper mold of the fine blanking apparatus viewed from the bottom of the apparatus according to the embodiment of the present invention
5 is a plan view of the lower mold of the fine blanking apparatus according to the embodiment of the present invention
Fig. 6 is an enlarged view of the portion " A "
FIGS. 7 to 9 are diagrams illustrating a state in which the material is seen from the front to explain the process of forming the material by the fine blanking apparatus according to the embodiment of the present invention. FIG.
FIGS. 10 to 12 are diagrams illustrating a state in which the material is viewed from a plane to explain a forming process of the material by the fine blanking apparatus according to the embodiment of the present invention. FIG.

Hereinafter, embodiments of a progressive fine blanking apparatus for manufacturing a multi-layer product and a method of manufacturing a multi-layer product using the apparatus according to the present invention will be described with reference to FIGS. 3 to 12.

Prior to the description of the embodiment, it is assumed that the multilayered product manufactured by the fine blanking apparatus of the present invention is the sector gear 12.

Here, the sector gear 12 is formed by a three-layer embossed structure of a coupling protrusion layer, a stopper layer 12c, and a root layer 12a. The stopper layer 12c is formed in a region where the engaging projections 12d of the workpiece 20 are molded in a range of the reclining angle And the cam ring layer 12a is formed so as to have a space for covering the respective lock gears 17, the cam springs 16 and the cams 15, The small gear 12e engaging with the small gear 12e is formed.

FIG. 3 is an internal state view for explaining a fine blanking apparatus according to an embodiment of the present invention, and FIG. 4 is a plan view of a lower mold of a fine blanking apparatus according to an embodiment of the present invention.

As can be seen from these drawings, a progressive type fine blanking apparatus (hereinafter referred to as "fine blanking apparatus") for manufacturing a multilayered product according to an embodiment of the present invention includes an upper mold 100, a lower mold 200, The insert rings 610 and 620, the movable punches 510 and 520, and the hydraulic actuators 300 and 400, respectively.

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The lower mold 200 constituting the fine blanking apparatus according to the embodiment of the present invention is installed on the ground and the upper mold 100 is positioned on the upper portion of the lower mold 200, 200 that can move up and down.

The upper mold 100 includes an upper holder 110 constituting an upper body and upper and lower punches 150, 160 and 170 for forming a material while being provided below the upper holder 110 and supporting the upper punch 150, A punch holder 120 and an upper backing plate 140 provided inside the upper holder 110 to support the punch holder 120. [ At this time, the pressing plate 130 is provided around the punch holder 120 to stably press and fix the workpiece 20 during the process.

Here, the upper punches 150, 160, and 170 include upper punches 150 (hereinafter, referred to as " first upper punches ") for forming the engaging projections 12d of the engaging projection layers forming the sector gear 12, (Hereinafter referred to as "second upper half punch") 160 for forming a stopper layer 12c constituting the sector gear 12 and a lower half punch (Hereinafter, referred to as " third-phase punch ") 170 for forming the gearing layer 12a and the gear 12e and gear forming and blanking for blanking the completed sector gear 12 And the upper punches 150, 160, and 170 are spaced apart from each other along the conveying direction of the work 20.

The lower mold 200 includes a lower holder 210 constituting a lower body, a die backing 220 mounted on the upper surface of the lower holder 210, A die holder 230 which is vertically movable up and down and a die holder 230 supported by the die holder 230 so as to move up and down relative to the upper punches 150, And a die plate 240 for supporting the lower punches 250, 260 and 270. The upper and lower punches 250, 260,

Each of the lower punches 250, 260 and 270 includes a lower punch for forming a projection (hereinafter, referred to as "first lower punch") 250 (hereinafter referred to as a "lower punch") for forming each of the engaging projections 12a of the engaging projection layer constituting the sector gear 12 (Hereinafter referred to as a "second lower die punch") 260 for forming a stopper layer 12c constituting the sector gear 12 and a lower die punch (Hereinafter referred to as " third lower die punch ") 270 for forming the gearing layer 12a and the gear 12e and for gearing the finished sector gear 12 for blanking The lower punches 250, 260, and 270 are spaced apart from each other along the conveying direction of the work 20, and are provided at positions corresponding to the positions of the upper punches 150, 160, and 170, respectively.

The first upper die punch 150 and the lower first die punch 250 are formed as a primary molding part forming a plurality of engaging projections 12d while exerting pressure corresponding to each other. And the second lower die punch 260 form a secondary molding part that forms a stopper layer 12c while exerting pressure corresponding to each other, and the third upper die punch 170 and the third lower die punch 270 correspond to each other And forms a tertiary forming part performing blanking together with the shaping of the girder layer 12a and the gear 12e while exerting pressure.

The third lower die punch 270 includes a cylindrical blanking punch 271 provided along the front end region of the work 20 and operated to shear the front end region of the work 20, Is formed along the inner periphery of the blanking punch 271 and has a protrusion 272a for protruding the protrusion layer 12a and is formed on the outer circumference of the protrusion 272a, And a gear punch 272 having a gear-shaped gear forming portion 272b for forming a gear 12e on the inner peripheral surface.

The fine blanking apparatus according to the present invention as described above includes upper and lower punches 150, 160 and 170 and lower punches 250, 260 and 270 having a structure corresponding to the upper and lower molds 100 and 200, The presser plate 130 of the upper mold 100 presses the surface of the workpiece 20 and presses the surface of the workpiece 20 in a stable state while the punching process is in progress. It is possible to form the sector gear 12 in a fine blanking manner in which precision parts can be produced.

Next, the insert rings 610 and 620 press the cushion fins 190 and 190 provided on the respective molds 100 and 200 in the molding process of the material by the relative movement of the upper mold 100 and the lower mold 200, .

The insert rings 610 and 620 include an upper insert ring 610 positioned at an upper end of the upper mold 100 and a lower insert ring 620 positioned at a lower end of the lower mold 200.

The cushion pins 190 and 190 are configured to grip the workpiece 20 while the shape is being formed by the punches 150, 160, 170, 250, 260 and 270 from the workpiece 20, And the lower end is pressed by the upper insert ring 610 and the lower insert ring 620 to grip the workpiece 20.

Next, the movable punches 510 and 520 press the unformed portions of the multi-layered product (sector gear) formed in the material 20 during the forming and blanking processes for the material 20, Layered product can be smoothly taken out from the multi-layered product (20).

In the embodiment of the present invention, the above-described movable punches 510 and 520 include an upper movable punch 510 positioned inside the third upper punch 170 and a lower movable punch 510 positioned inside the third lower punch 270 520 as shown in FIG. Of course, although not illustrated in the embodiment, the movable punches 510 and 520 may be additionally installed on the side or inner side of the second upper punch 160 and the second lower punch 260.

Next, the hydraulic actuating parts 300 and 400 are configured to provide an operating force to selectively actuate the movable punches 510 and 520 by oil pressure. The hydraulic actuating parts 300 and 400 may be operated from the process of blanking the multi- The movable punches 510 and 520 provide an operating force so that the movable punches 510 and 520 continuously fix the multi-layered product until the multi-layered product is taken out, thereby assisting in smoothly taking out the blanked multi-layered product.

That is, in the progressive-type fine blanking apparatus as in the embodiment of the present invention, when each step progresses step by step, the thickness of the multi-layered product (the sector gear The movable punches 510 and 520 and the hydraulic actuating parts 300 and 400 are additionally provided so that the final step (the step of the portion formed by the tertiary forming part) of the workpiece 20, So that it is possible to smoothly take out the product from the raw material 20. [0031] As shown in FIG.

The hydraulic actuating part 300 and 400 includes an upper hydraulic actuating part 300 provided on the upper insert ring 610 and providing an additional actuating force to the upper movable punch 510 of the upper mold 100, And a lower hydraulic actuating part 400 provided in the lower mold 200 to provide additional operating force to the lower movable punch 520 of the lower mold 200.

The upper hydraulic actuating part 300 includes an upper side operating groove 310 formed in a lower surface of the upper insert ring 610 so as to have a working space at a position corresponding to the upper movable punch 170, An upper side lifting block 320 installed to move up and down in the operating groove 310 and to be lifted and lowered by hydraulic pressure provided in the upper side operating groove 310, Vertically passing through the upper backing plate 120 and the upper backing plate 140 and the upper holder 110 so that the upper end thereof is pressed by the upper side lifting block 320 while being connected to the upper side lifting block 320, And an upper side movable pin 330 for transmitting operating force to the upper movable punch 510 while being connected to the upper movable punch 510.

In addition, the lower hydraulic actuating part 400 includes a lower side operating groove 410 formed on the upper surface of the lower insert ring 620 and formed to have a working space at a position corresponding to the lower movable punch 520, A lower side lift block 420 installed to be movable up and down within the lower operation groove 410 and to be raised and lowered by hydraulic pressure provided in the lower operation groove 410, The lower end is vertically passed through the holder 210, the die backing 220 and the die holder 230 and is pressed by the lower side lifting block 420 while being connected to the lower side lifting block 420, And a lower side movable pin 430 for transmitting operating force to the lower movable punch 520 in a state where the upper end is connected to the lower movable punch 520.

The upper side movable pin 330 and the lower side movable pin 430 are provided separately from the upper movable punch 510 and the lower movable punch 520. However, Do not. That is, the upper side movable pin 330 and the lower side movable pin 430 may be integrally formed with the upper movable punch 510 and the lower movable punch 520, respectively, The lower side lifting block 420 and the lower side lifting block 420 may be integrally formed.

In addition, the elevation height of the movable punches 510 and 520 may be a height of a stepped portion formed in the workpiece 20 in a previous process. That is, each of the elevating blocks 320 and 420 is elevated by a step corresponding to the height of the girder layer 12a formed in the workpiece 20 by the third upper punch 170 and the third lower punch 270, It is possible to operate the upper movable punch 510 and the lower movable punch 520 so as to prevent defective product removal during blanking due to the additional step height formed in the workpiece 20 in accordance with the molding of the girder layer 12a To be able to do.

In addition, the upper holder 110 and the lower holder 210 are provided with hydraulic pressure terminals 340 and 440, respectively, which provide hydraulic pressures for operating the hydraulic operating parts 300 and 400, Hydraulic passages 350 and 450 are formed to pass through the operating grooves 310 and 410 of the respective hydraulic rings 300 and 400 formed in the insert rings 610 and 620 from the hydraulic rings 340 and 440, Through conduits (350, 450) into the respective actuating grooves (310, 410).

Of course, the upper insert ring 610 and the lower insert ring 620 may each have the hydraulic terminals 340 and 440, but the circumferential surfaces of the upper insert ring 610 and the lower insert ring 620 may be formed as fine blanking It is difficult to provide the hydraulic terminal at the corresponding portion because the structure is accommodated in the structure of the apparatus. Thus, the hydraulic terminals 340 and 440 are formed in the upper holder 110 and the lower holder 210, respectively, It is preferable that the hydraulic transmission conduits 350 and 450 are formed so as to communicate with each other until the grooves 310 and 410 of the insert rings 610 and 620 are connected.

In the embodiment of the present invention, a plurality of reference holes 21, which are formed for determining the reference position in the forming process of the work 20, are formed at the positions where the primary forming parts are located among the respective parts of the upper mold 100, And a plurality of reference hole forming punches 180 for forming the reference holes.

That is, the plurality of reference holes 21 may be formed together in the process of forming the engaging projections 12d in the workpiece 20 in the primary forming unit, and then the secondary forming unit and the tertiary forming unit The process can be performed on the basis of the reference hole 21, thereby enabling precise molding of the product.

Of course, in the case of the reference hole forming punch 180, the reference hole forming punch 180 may be additionally provided on the side of the material feeding side which is the side of the primary forming part. However, in this case, the size of the entire fine blanking device is necessarily increased. It is most preferable to provide the reference hole forming punch 180 together in the primary forming portion as in the embodiment.

Hereinafter, a process of manufacturing a multilayer product using the fine blanking apparatus according to an embodiment of the present invention will be described in detail with reference to FIGS. 7 to 12. In this case, the multi-layered product is a sector gear 12, and the reference numerals of the sector gears are also referred to.

First, when the flat plate material 20 is transferred between the upper mold 100 and the lower mold 200, the material 20 is transferred to the upper mold 100 and the lower mold 200, The position of the secondary forming part, and the position of the tertiary forming part.

In this process, the material 20 is formed with a plurality of engaging projections 12d and a reference hole 21, as shown in FIGS. 7 and 10, respectively, in the process of passing through the primary forming part.

Each of the engaging protrusions 12d is formed by a corresponding operation between a plurality of first upper type punches 150 and a plurality of first lower type punches 250 provided in the primary forming part, Is formed by the operation of the reference hole forming punch 180 provided in the primary forming section.

Particularly, each of the engaging projections 12d protrudes from the upper surface of the flat plate material 20, and a step is formed on the bottom surface of the material 20 by a projecting height of the projecting portion, thereby forming a single-stage embossing structure.

The stopper layer 12c, which is provided to the secondary forming part and limits the range of the reclining angle during passing through the secondary forming part, 17 and the cover layer 12b covering the cam spring 16 and the cam 15 are formed.

The stopper layer 12c and the cover layer 12b are formed by a corresponding operation between the second upper mold punch 160 and the second lower mold punch 260 provided in the secondary molding section.

Particularly, the stopper layer 12c is formed by protruding from the upper surface of the flat plate material 20, and the space for forming the cover layer 12b is formed by the protrusion height of the stopper layer 12c, Is formed through additional steps on the bottom surface of the base 20.

At this time, the engaging projections 12d formed by the primary forming unit are positioned on the upper surface of the stopper layer 12c, so that the material 20 has a two-stage embossing structure. This is as shown in Figs. 8 and 11 attached hereto.

Through the above process, the portions where the stopper layer 12c and the cover layer 12b have been formed are supplied to the tertiary forming portion, and then the intermediate layer 12a and the gear 12e passing through the tertiary forming portion And at the same time, the portion where the molding is performed is blanked and sheared.

Here, the girder layer 12a and the gear 12e are formed by a corresponding operation between the third and fourth lower mold punches 170 and 270 provided in the third molding section.

Particularly, the girder layer 12a is formed by protruding from the upper surface of the flat plate material 20, and the space for forming the gear 12e is formed by the protruding height with respect to the protruding portion of the girder layer 12a Is formed on the bottom surface of the material (20) through additional steps.

Since the gear forming portion 272b is formed in the gear punch 272 forming the third lower die punch 270, the forming and blanking of the material 20 by the pressing of the third upper die punch 170 A gear 12e is formed on the inner circumferential surface of the base layer 12a of the workpiece 20 by the gear forming portion 272b of the third lower die punch 270. [ The stopper layer 12c formed by the secondary forming part is formed on the upper surface of the initial layer 12a so that the multi-layered product 12 having a three- Is formed.

While the forming and blanking of the workpiece 20 due to the relative motion between the third and fourth upper mold punches 170 and 270 is proceeding, the upper and lower hydraulic actuators 300 and 400 Is operated.

That is, in addition to the fluid being supplied through the hydraulic terminals 340 and 350, the fluid thus provided is supplied to the upper side operation groove 310 and the lower insert ring 620 of the upper insert ring 610 through the hydraulic transmission conduits 350 and 450, And the lift pins 320 and 420 in the respective operation grooves 310 and 410 are lifted and lowered respectively by the pressure of the fluid transmitted to the upper and lower operation grooves 410 and 410, The upper movable punch 510 and the lower movable punch 520 which are connected to the movable pins 330 and 430 move in the direction of the plane of the multi-layered product 12 of the material 20, The unmolded portion at the time of the corresponding process, which is an inner side portion of the upper die 12a, is pressed and fixed at the same time.

In this state, when the blanking of the multi-layered product 12 is completed from the material 20, the upper mold 100 is lifted. At this time, the two movable punches 510, The gripping portion 12 is kept gripped.

Also, when the upper mold 100 is raised to a predetermined height (downward movement distance of the upper movable punch) by the above process, the upper movable punch 510 and the third upper punch 170 are raised simultaneously. In this case, however, the lower hydraulic actuating part 400 further raises the lower movable punch 520 through the additional hydraulic supply, so that the multilayered product 12 maintains a continuous gripping state, The product 12 can be smoothly separated from the material 20. [

The hydraulic pressure provided to the upper hydraulic actuating part 300 and the lower hydraulic actuating part 400 is released at the same time and the multi-layered product 12 separated from the workpiece 20 is moved in the carrying direction And is discharged in the corresponding direction by the output of the instantaneous discharge air blown in the direction perpendicular to the direction of the discharge.

As a result, the progressive-type fine blanking apparatus for manufacturing a multilayered product of the present invention and the method for manufacturing a multilayered product using the apparatus have an advantage in that it is possible to manufacture a sector gear 12 having a multi-layer embossing structure using a fine blanking method.

Furthermore, the fine blanking apparatus can be manufactured in a progressive manner, thereby making it possible to manufacture the sector gear 12 by a single fine blanking apparatus. In particular, the upper hydraulic actuating unit 300 and the lower hydraulic actuating unit 400 The sector gear 12 formed in the multi-stage embossing structure can be smoothly taken out from the work 20.

100. Upper mold 110. Upper holder
120. Punch holder 130. Presser plate
140. Upper backing plate 150. First upper punch
160. Second Hollow Punch 170. Third Hollow Punch
180. Reference hole forming punch 200. Lower mold
210. Lower holder 220. Die backing
230. Die holder 240. Die plate
250. First lower punch 260. Second lower punch
270. Third Lower Punch 271. Blanking Punch
272. Gear Punch 272a. projection part
272b. Gear forming section 300. Upper hydraulic operating section
310. Upper side operating groove 320. Upper side lifting block
400. Lower hydraulic operating portion 410. Lower operating groove
420. Lower side lift block 340, 440. Hydraulic terminal
350,450. Hydraulic transmission line 610. Upper insert ring
620. Lower insert ring

Claims (5)

An upper mold having a plurality of upper punches provided on a step-by-step basis for multi-layer molding of a material;
A lower mold having a plurality of lower punches provided on a step-by-step basis for multi-layer molding of the material while performing relative movement with the upper punches of the upper mold;
An insert ring provided at the upper end of the upper mold and at the lower end of the lower mold, respectively, for providing a pressing force to the cushion pin provided on the upper mold and the lower mold for holding the material when the material is formed by the upper mold and lower mold;
A pair of movable punches which are positioned at a position corresponding to a non-formed portion of the material among the portions provided with at least one of the upper and lower punches, and grip the non-formed portion of the material; And,
And a hydraulic actuating part provided on each of the insert rings to provide an actuating force for selectively actuating the movable punches by oil pressure, respectively. ≪ Desc / Clms Page number 19 > The method according to claim 1,
The hydraulic actuating part
A working groove formed in the surface of the insert ring so as to be formed in a region corresponding to a position of each of the movable punches to form a space provided with an oil pressure,
A lifting block installed in the operating groove to be lifted and lowered by the hydraulic pressure;
And a movable pin which vertically passes through the metal mold and receives an urging force from the elevating block while the upper end thereof is connected to the elevating block and the lower end selectively presses the movable punches while being connected to the movable punches Wherein the first and second blanks are disposed in the same plane. The method according to claim 1 or 2,
Wherein the operating height of the movable punch is a height of a stepped portion formed in the material in a preceding step. 3. The method of claim 2,
Wherein the upper mold and the lower mold are provided with hydraulic terminals for supplying hydraulic pressure for operation of the hydraulic actuating part,
Wherein each of the metal molds and each insert ring is formed with a hydraulic pressure transmission line communicated from the hydraulic pressure terminal to a space in a working groove constituting the hydraulic operation portion,
Wherein the hydraulic pressure provided to the hydraulic terminal is transmitted through the hydraulic pressure conduit into the operating groove to force the elevating block to move. A first step of conveying the material to a process position;
A second step of moving the upper mold downward to perform forming or blanking of the material through a corresponding operation between the upper punch and the lower punch;
The upper hydraulic actuating part provided on the upper insert ring and the lower hydraulic actuating part provided on the lower insert ring are operated so that the upper movable punch and the lower movable punch correspond to each other, A third step of gripping the molded part;
A fourth step of raising the upper mold when the forming and blanking of the material is completed;
When the upper punch and the upper movable punch are moved upward together with the upper mold halfway through the fourth step, the lower movable punch is further elevated through the operation control of the lower hydraulic actuating part to complete the upward movement of the upper mold A fifth step of keeping the multilayered article in a grip state continuously; And,
And a sixth step of simultaneously releasing the operation of the upper hydraulic actuating part and the lower hydraulic actuating part to take out the multi-layered product separated from the work to the outside when the upward movement of the upper mold is completed in the fifth step Wherein the step of forming the multi-layered product comprises the steps of:

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