TW202216316A - Forming die and partial support hot forming method of shell parts using the same - Google Patents

Abstract

A forming die and a local pressure holding hot forming method for a shell part thereof, the forming die comprises: A first mold base assembly has a first die; a second mold base assembly has a second die, the second die has a mold cavity, the second die and the first die can be mold-clamped and mold-opened, a sheet material placed between the second die and the first die. A supporting sliding block is set in the hollow part of the mold cavity. The first die can move linearly from a first position, a second position to a third position, the supporting sliding block can move linearly between a fourth position and a fifth position, and the supporting sliding block keeps an interval with the first die at the second position when the first die moves to the third position, The supporting sliding block and the first die move to the fifth position synchronously under the maintenance interval.

Description

Forming die and local pressure-holding thermoforming method using the same

The present invention relates to a local pressure-holding thermoforming method for a forming die and a shell using the same, in particular to a method that can maintain a certain thickness gap between the first die and the local pressure-holding mechanism through the double-acting mechanism during the forming process, and The shell must be kept flat for contact cooling, and the forming mold and thermoforming method must be maintained in a warm state.

Patent Publication No. TW201908094A of the Republic of China discloses a heat-dissipating heat-dissipating coating structure for the case of a portable electronic device, which is applied to the front case and the rear case of the electronic portable device. The front case and the rear case are correspondingly combined into a component, In the cavity between the rear case and the front case, the top surface of the front case and the front case are provided with predetermined electronic components, and a high heat dissipation material is transferred on the unmolded plasticizing plate to form a heat dissipation coating. The flat plate 11; then the flat plate 11 is inserted into a mold 1 that is clamped by the upper mold 13 and the lower mold 14, hot-pressed to form, heated to about 300-900 degrees Celsius, and after the flat plate 11 is softened, it is thermoplastically formed through the mold 1 , and hold pressure and shape in the mold cavity 12 to prevent springback deformation, as shown in Figure 1; in this way, a 3D front shell or shell is formed, and the heat dissipation coating on the surface is thermally pressed. The heat dissipation coating structure of the shell or the rear shell, the heat dissipation coating structure is arranged in the vertical direction of the surface of the shell to form a dense structure. However, when the mold is in the closed state during the hot press forming process of the present technology, the board surface will be bent and deformed, which may easily cause the problem of poor dimensional accuracy and yield.

In addition, in order to overcome the above-mentioned defects of the bending deformation of the board surface, the prior art discloses a The practice of placing thickness spacers in the sheet to maintain the gap, but this solution requires digging holes in the sheet for escape, resulting in the defect of holes in the final formed shell, which affects its design flexibility and structural performance strength. And generally there is no support plate design in the sheet metal forming process, so after forming, the cut section will be distorted when the mold is closed, resulting in deformation.

The purpose of the present invention is to provide a forming mold, which can use the first mold and the second mold to cooperate with a support slider that can move in the mold cavity during the mold clamping process. On the one hand, local contact cooling can be carried out on the flat part, and a warm state can be maintained on the part that needs to be formed.

In order to achieve the above object, the present invention provides a forming die suitable for partial pressure-holding thermoforming of a sheet material, comprising: a first die base assembly, which is fixed with a first die; a second die base assembly, connected with The first mold base assemblies are arranged in pairs and at a distance from each other, the second mold base assembly includes a second mold, the second mold has a mold cavity, the mold cavity has a hollow part, and the sheet material is placed on the cover Between the second mold and the first mold in the region of the mold cavity, the second mold and the first mold can be mutually mold-clamped and mold-opened; and a support slider is disposed at the hollowed-out portion; wherein , the first mold can move linearly relative to the second mold in a first position in the mold-opening state, through a second position in contact with the sheet material to a third position in a closed mold, and the support slider can Linearly moves between a fourth position protruding from the bottom surface of the mold cavity and a fifth position located in the mold cavity, and the support slider is in the fourth position with the first mold located in the second position. A gap is maintained, and when the first mold moves to the third position, the first mold moves to the fifth position synchronously with the first mold maintaining the gap.

In some embodiments, the first mold base assembly of the present invention further includes a first mold base, a blanking plate fixed on the first mold base and disposed corresponding to the peripheral area of the mold cavity, and a first mold base located in the first mold base. A bolt member between the seat and the blanking plate and an elastic member corresponding to the screwing member, the blanking plate can move freely along the direction of the central axis of the screwing member.

In some embodiments of the present invention, the sheet material includes a flat area and a forming area, the area of the sheet material in contact with the support slider is the flat area, and the peripheral area of the flat area corresponds to the inner ring of the platen The area on the sheet material is the forming area.

In some embodiments, the present invention further includes an insulation mechanism disposed on the surface of the blanking plate in contact with the sheet metal.

In some embodiments of the present invention, the thermal insulation mechanism is a thermal insulation sheet or a gap.

The purpose of the present invention is to provide a partial pressure-holding thermoforming method for shell parts, which is formed by moving synchronously with the support slider under the contact and pressure-holding die of the forming die, and performing pressure-holding cooling on the flat part of a sheet metal by the forming die. The forming place is maintained warm to facilitate forming into a shell.

In order to achieve the above object, the present invention provides a method for partial pressure-holding thermoforming of a shell, the steps of which include: providing the above-mentioned forming mold, and positioning the first mold at the first position and the support slider at the fourth position position, the first mold is in a mold-parting state relative to the second mold; a heating and feeding step is to heat a thermoplastic composite sheet material and transfer it to the support slider above the mold cavity, the The sheet metal includes a flat area and a forming area located on the periphery of the flat area; a mold clamping step is to move the first mold base assembly toward the direction of the second mold base assembly, and make the pressing plate press the sheet material The first mold moves to the second position while outside the forming zone; in a forming step, the first mold is moved from the second position to the third position, and the support slider is moved to the first position at the same time. The mold moves from the fourth position to the fifth position synchronously, so that the first mold and the support slider jointly perform pressure-holding action displacement forming on the flat area of the sheet metal, and the first mold and the support slider The block maintains a certain thickness gap during the sheet metal forming process; and a pressure-holding cooling step makes the first mold and the support The slider continuously contacts the sheet material for a set time at the forming position to form the shell, and pushes out the shell after the first mold and the second mold are divided.

In some embodiments, it further includes a cutting step to remove waste around the shell to produce a shell product.

In some embodiments, the heating of the sheet material in the heating and loading step is to heat the sheet material to 160° C. to 250° C. in a heating furnace, and transfer the sheet material to the support within 8 to 13 seconds. on slider 5.

In some embodiments of the present invention, the temperature of the forming zone of the forming step is maintained at 160° C.˜250° C. during the forming process.

In some embodiments of the present invention, the flat area of the sheet material includes a functional element, and the functional element includes an antenna, a heating element or a thermally conductive element.

The present invention has at least the following features: the forming die of the present invention can be contacted and cooled for the place to be kept flat, and the place to be formed is maintained in a warm state for easy forming, so that the bottom surface of the shell to be formed can be kept flat and not easily twisted. In the initial forming stage, the forming die of the present invention can reduce the amount of strain and reduce the risk of rupture during forming under the action of micro-pressure fixing of the blanking plate. The present invention can make the thickness uniformity and reproducibility of the bottom surface of the formed shell piece high, and the functional sheet-like parts embedded in the formed shell piece can also be less likely to be crushed. The sheet metal processed by the invention only needs to be heated outside the line, and the forming mold does not need to be embedded in the heating source device, which can simplify the design, save heating energy, and have mass production capacity.

1: Mold

11: Tablet

111: Board surface

12: Mould cavity

13: Upper die

14: Lower die

2: Forming mold

3: The first die base assembly

31: The first mold

32: The first mold base

33: Binder plate

34: Bolt parts

35: Elastic

4: Second die base assembly

41: The second die base

42: Second mold

421: Mould cavity

422: hollow part

5: Support the slider

6: Insulation mechanism

7: Shell parts

D1: first position

D2: Second position

D3: Third position

S1: Fourth position

S2: Fifth position

P: sheet metal

P1: leveling area

P11: Functional elements

P2: forming area

P3: Pressing area

P4: First mold contact area

P5: Waste area

S11~S16: The steps of the partial pressure-holding hot forming method of the shell

S16: Cutting step

[FIG. 1] is a cross-sectional view of the prior art for hot-pressing a sheet before opening the mold and loading;

[Fig. 2] is a cross-sectional view before the mold clamping and pressure-holding forming of Fig. 1;

[Fig. 3] is a three-dimensional schematic diagram of the distortion of the bottom surface of the plate during mold clamping without a support block in the prior art;

[Fig. 4] is a perspective view of the mold parting state of the forming mold of the present invention;

[Fig. 5] is a perspective view of the mold clamping state of the forming mold of the present invention;

[Fig. 6] is a front cross-sectional view of the mold before mold clamping and molding of the forming mold of the present invention;

[Fig. 7] is a front cross-sectional view of the mold for forming and positioning the forming mold of the present invention;

[Fig. 8] is a front cross-sectional view of the mold parting state of the first mold and the second mold of the forming mold of the present invention;

[Fig. 9] is a front sectional view of the first mold of the forming mold of the present invention and the pressing plate pressing the sheet metal;

[Fig. 10] is a front sectional view of the mold action before the mold forming of the first mold of the forming mold of the present invention and the second mold;

Fig. 11 is the die action front sectional view of the first die and the second die of the forming die of the present invention;

[Fig. 12] is a schematic top view of the contact part between the sheet metal and the forming die of the present invention;

[FIG. 13] is a three-dimensional schematic diagram of the bottom surface of the sheet material kept flat after the forming die of the present invention is closed and cooperated with the supporting slider to act;

[FIG. 14] is a schematic diagram of the sheet metal leveling area including functional elements according to the present invention;

Fig. 15 is a flow chart showing the steps of the partial pressure-holding thermoforming method of the shell of the present invention.

Hereinafter, the embodiments of the present invention will be described in detail in conjunction with the drawings. The accompanying drawings are mainly simplified schematic diagrams, and only illustrate the basic structure of the present invention in a schematic manner. Therefore, only the elements related to the present invention are indicated in these drawings. , and the displayed components are not drawn according to the number, shape, size ratio, etc. of the actual implementation. The size of the actual implementation is actually a selective design, and the layout of the components may be more complicated.

The following descriptions of the various embodiments refer to the accompanying drawings to illustrate specific embodiments in accordance with which the invention may be practiced. The directional terms mentioned in the present invention, such as "up", "down", "front", "rear", "left", "right", "inside", "outside", "side", etc., are only for reference Additional schema orientation. Therefore, the directional terms used are used to describe and understand the present application, rather than to limit the present application. Additionally, in the specification, unless explicitly described to the contrary, the word "comprising" will be understood to mean the inclusion of stated elements but not the exclusion of any other elements.

Please refer to Figure 4 to Figure 11. The embodiment of the forming die 2 provided by the present invention is a forming die 2 suitable for performing partial pressure-holding thermoforming on a sheet material P, especially a sheet material containing a thermoplastic composite layer. The sheet material containing thermoplastic composite material mentioned in the present invention refers to a multi-layer structural sheet material having a thermoplastic composite material layer and a metal sheet material layer; the thermoplastic composite material includes fiber and thermoplastic polymer, and the fiber includes glass fiber and carbon fiber; Sheet metal materials include aluminum (alloy), magnesium (alloy) or steel, and light metals such as aluminum (alloy) and magnesium (alloy) are preferred for lightweight requirements. The above-mentioned multi-layer structure may refer to a structure in which two or more layers, thermoplastic composite material layers and metal sheet material layers are alternately stacked. The forming mold 2 includes: a first mold base assembly 3 , a second mold base assembly 4 and a support slider 5 ; a first mold 31 is fixed on the first mold base assembly 3 , and the first mold 31 can be It is an upper die, such as a punch element; the second die base assembly 4 is paired with the first die base assembly 3, and its initial position is the first die base assembly 3 and the second die base assembly 4 The second mold base assembly 4 includes a second mold base 41, a second mold 42 fixed to the second mold base 41, and the second mold 42 has a A cavity 421, the cavity 421 has a hollow part 422, the sheet material P is placed on the area covering the cavity 421, that is, between the second mold 42 and the first mold 31, the second mold The mold 42 and the first mold 31 can be closed and opened with each other; the support slider 5 is disposed on the hollow part 422 . In some embodiments, the support slider 5 and/or the first mold A cooling mechanism can be added to the 31 , such as the design of water channels, to speed up the cooling speed of the support slider 5 and/or the first mold 31 , so that the sheet material P can be processed more efficiently to reduce the forming cycle.

As shown in FIGS. 8 to 11 , according to the aforementioned structure, the first mold 31 can move linearly between a first position D1 to a third position D3 : the first position D1 of the first mold 31 refers to the The relative positions of the first mold 31 and the second mold 42 are in an open state (ie, the first mold 31 and the second mold 42 are separated), as shown in FIG. 8 .

As shown in FIG. 9 , the second position D2 of the first mold 31 refers to the position where the first mold 31 moves toward the second mold 42 and the first mold 31 just contacts the sheet material P. As shown in FIG.

As shown in FIG. 11 , the third position D3 of the first mold 31 means that when the first mold 31 and the second mold 42 are in a closed molding state, the first mold 31 moves to the cavity 421 A forming fixed point inside: that is, the end position of the stroke where the first mold 31 presses the sheet material P to the bottom surface of the mold cavity 421 .

According to the aforementioned structure, the support slider 5 can move linearly between a fourth position S1 protruding from the bottom surface of the mold cavity 421 and a fifth position S2 located in the mold cavity 421 , and the support slider 5 is positioned at the first position S2 in the mold cavity 421 . The fourth position S1 maintains an interval with the first mold 31 located at the second position D2 (as shown in FIG. 8 ), and is separated from the first mold 31 when the first mold 31 moves to the third position D3 Maintain the interval and move to the fifth position S2 synchronously (as shown in FIG. 9 to FIG. 10 ).

In some embodiments, the first mold base assembly 3 of the present invention further includes a first mold base 32 , a blanking plate 33 fixed to the first mold base 32 and corresponding to the peripheral area of the mold cavity 421 , and a A bolt member 34 located between the first die base 32 and the blanking plate 22 and an elastic member 35 (such as a compression spring) corresponding to the screwing member 34 , the blanking plate 22 can move along the screwing member 34 move freely in the direction of the central axis.

As shown in FIG. 12 , in some embodiments of the present invention, the sheet material P includes a flat area P1 and a forming area P2 , and the area of the sheet material P that the support slider 5 contacts is the flat area P1 . The forming area P2 is the area from the peripheral area of the flattening area P1 to the area corresponding to the inner ring of the pressing plate 33 that is in contact with the sheet material P.

As shown in FIG. 9 , in some embodiments, the present invention further includes an insulation mechanism 6 disposed on the surface of the second mold 42 and/or the pressing plate 33 in contact with the sheet material P, for example The surface of the blanking plate 33 and the peripheral surface of the cavity 421 of the second mold 42 can reduce the loss of heat energy in the forming area P2 of the sheet material P, and can maintain a relatively high temperature suitable for forming.

In some embodiments of the present invention, the thermal insulation mechanism 6 is a thermal insulation sheet. In other embodiments of the present invention, a gap can be maintained between the sheet material P and the second mold 42 .

Please refer to Fig. 6 to Fig. 11 in conjunction with Fig. 13 and Fig. 15. The partial pressure-holding thermoforming method for the shell of the present embodiment includes the following steps:

Step S11 : Provide the forming mold 2 as described above, and make the first mold 31 located at the first position D1 and the support slider 5 at the fourth position S1 , and the first mold 31 is positioned relative to the second mold 42 . In a mold-parting state, the position of the forming mold 2 shown in Figure 8;

Step S12 : a heating and feeding step, which is to heat a thermoplastic composite sheet material P and transfer it to the support slider 5 above the mold cavity 421 , the sheet material P includes a flat area P1 and a flat area P1 The peripheral forming area P2, as shown in Figure 8;

Step S13 : a mold clamping step, moving the first mold base assembly 3 toward the direction of the second mold base assembly 4 , and while pressing the blanking plate 33 against the outside of the forming area P2 of the sheet material P, The first mold 31 is moved to the second position D2, as shown in FIG. 10 to FIG. 11 ;

Step S14: a forming step, moving the first mold 31 from the second position D2 move to the third position D3, and simultaneously move the support slider 5 and the first mold 31 from the fourth position S1 to the fifth position S2, so that the first mold 31 and the support slider 5 together The flat area P1 of the sheet material P is subjected to pressure-holding action displacement forming, and a certain thickness gap is maintained between the first die 31 and the support slider 5 during the forming process of the sheet material P, as shown in FIGS. 10 to 11 . In addition, during the entire forming process of the sheet material P, the sheet material P can be prevented from being bent and deformed at this position due to the support of the slider 5; and

Step S15 : a pressure-holding cooling step, the first mold 31 and the support slider 5 are continuously contacted with the sheet material P at the forming position for a set time to form the shell 7 , and the first mold 31 and the support block 5 are formed into the shell 7 . After the second mold 42 is split, the shell 7 is ejected to complete a forming metal laminate (FML) shell 7 product, as shown in FIG. 11 .

12 is a schematic top view of the contact part between the sheet metal and the forming die of the present invention, the flat area P1 is represented by a dotted area in the figure, which is the area that is in contact with the support slider 5 during the forming process of the sheet metal P, and the The area is contacted by the support slider 5, so it has a faster cooling and cooling rate than other areas of the sheet metal P; in FIG. During the process, the area where the first mold 31 is contacted and moved, the flat area P1 in contact with the support slider 5 is the area where the mold is kept under pressure and cooled, which is beneficial to eliminate the rebound force after the material is formed, especially the above-mentioned thermoplastic compound. The warpage caused by the springback of the sheet material of the material layer or the thin sheet material after thermoforming is particularly serious; The pressing area, from the periphery of the first die contact area P4 to the inner edge of the pressing area P3 in FIG. 12 is the forming area P2, and its temperature is relatively high, because after the self-heating sheet material P is moved into the forming die 2, the The heat insulation mechanism 6 works, so that a higher temperature can be maintained, which is favorable for forming the outer wall portion of the shell member 7 .

It is worth mentioning that, in an embodiment of the present invention, it further includes: step S16: a cut A cutting step is performed to remove the waste area P5 around the shell 7 to produce a molded shell 7 product.

In some embodiments, the heating of the sheet material P in the heating and feeding step S12 uses a heating furnace (not shown) to heat the sheet material P to 160° C.˜250° C. within 8˜13 seconds. The sheet material P is transferred to the support slide 5 .

In some embodiments of the present invention, the temperature of the forming zone of the forming step is maintained at 160° C.˜250° C. during the forming process.

As shown in Figure 14. In some embodiments of the present invention, the flat area P1 of the sheet material P includes a functional element P11, and the functional element P11 includes an antenna, a heating element or a thermally conductive element. In one embodiment, the antenna may be a 5G array antenna.

The embodiments disclosed above are only illustrative of the principles, features and effects of the present invention, and are not intended to limit the scope of the present invention. Modifications and changes are made to the above-described embodiments. Any equivalent changes and modifications made by using the contents disclosed in the present invention should still be covered by the following claims.

S11~S16: The steps of the partial pressure-holding hot forming method of the shell

Claims (10)

A forming die suitable for partial pressure-holding thermoforming of a sheet material, the forming die comprising: a first mold base assembly having a first mold; A second mold base assembly is paired with the first mold base assembly, the second mold base assembly includes a second mold, the second mold includes a mold cavity, the mold cavity has a hollow part, the sheet metal It is placed between the second mold and the first mold covering the area of the cavity, and the second mold and the first mold can be mutually mold-clamping and mold-opening; and a support slider, which is arranged on the hollow part; Wherein, the first mold can move relative to the second mold from a first position in the mold opening state, through a second position contacting the sheet material to a third position for mold closing, and the support slider can It moves between a fourth position protruding from the bottom surface of the mold cavity and a fifth position located in the mold cavity, and the support slider is held at the fourth position with the first mold located in the second position an interval, and when the first mold moves to the third position, the first mold moves to the fifth position synchronously with the first mold maintaining the interval. The forming die according to claim 1, wherein the first die base assembly further comprises a first die base, a blanking plate fixed on the first die base and corresponding to the peripheral area of the die cavity, and a A bolt piece between the first die base and the pressing plate and an elastic piece corresponding to the bolt piece, the corresponding two ends of the elastic piece are respectively abutted against the first die base and the pressing plate, The pressing plate system can move freely along the direction of the central axis of the bolt element and generate a reaction pressure when pressing the elastic element. The forming die according to claim 1, wherein the sheet material comprises a flat area and a forming area, the area of the sheet material in contact with the support slider is the flat area, and the peripheral area of the flat area reaches the platen The area of the inner ring corresponding to the sheet material is the forming area. The forming die according to claim 1, further comprising a heat insulation mechanism disposed on the second die and/or the surface of the pressing plate in contact with the sheet metal. The forming mold of claim 4, wherein the heat insulating mechanism is a heat insulating sheet. The forming die as claimed in claim 4, wherein the heat insulation mechanism is to maintain a gap between the sheet metal and the second die. A method for partial pressure-holding thermoforming of a shell, the steps comprising: Provide the forming mold as claimed in claim 4, and make the first mold located at the first position, the support slider at the fourth position, and the first mold is in a mold-parting state relative to the second mold; a heating and feeding step, which is to heat a sheet of thermoplastic composite material and transfer it to the support slider above the die cavity, the sheet material includes a flat area and a forming area located at the periphery of the flat area; In a mold clamping step, the first mold base assembly is moved toward the direction of the second mold base assembly, and the first mold is moved to the first mold while the blanking plate is pressed against the outside of the forming area of the sheet metal. two positions; In a forming step, the first mold is moved from the second position to the third position, and the support slider and the first mold are simultaneously moved from the fourth position to the fifth position, so that the first mold is moved from the fourth position to the fifth position. performing pressure-holding action displacement forming on the flat area of the sheet material together with the support slide block, and maintaining a certain thickness gap during the sheet metal forming process between the first die and the support slide block; and In a pressure-holding cooling step, the first mold and the support slider are kept in contact with the sheet material at the forming position for a set period of time to form the shell, and the first mold and the second mold are separated after mold separation. out of the shell. The method for partial pressure-holding thermoforming of a shell as claimed in claim 7, wherein the temperature of the forming zone in the forming step is maintained at 160°C to 250°C during the forming process. The method for partial pressure-holding thermoforming of a shell as claimed in claim 7, wherein the flat area of the sheet material includes a functional element. The method for partial pressure-holding thermoforming of a shell as claimed in claim 9, wherein the functional element comprises an antenna, a heating element or a heat conducting element.

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