TW201401966A - Method of manufacturing thin-type housing and product thereof - Google Patents

Abstract

A method of manufacturing thin-type housing and its product comprises: placing a flat-shaped blank between two molds correspondingly disposed, wherein at least one groove is arranged on a shaping mold surface of one of the molds; pre-heating the blank to achieve a forming temperature and performing a lamination by placing between the two molds; obtaining a semi-finished product of the thin-type housing after demolding, and forming at least one reinforcing rib corresponding to the groove on the semi-finished product of the thin-type housing; in the cooling process, balancing the shrinkage stress through the supporting of the reinforcing rib to effectively prevent the semi-finished product of the thin-type housing from being warped; and removing the reinforcing rib by milling after completing the cooling, thereby obtaining the thin-type housing.

Description

Manufacturing method of thin shell and product thereof

The present invention relates to the outer casing of the device, and more particularly to a method of manufacturing a thin casing and articles thereof.

Press, the outer casing of the electronic device is mainly used to protect the circuit and structure inside the electronic device to avoid damage or damage to the user. The traditional housing materials are made of plastic or stainless steel. With the development of technology and the needs of consumers, portable electronic devices such as notebook computers and mobile phones are becoming more and more lightweight and thinner. Housing materials have been unable to meet these needs, so thin shells made of lightweight materials such as aluminum, magnesium alloys, etc. have emerged. In addition to its light and thin features, the thin housing also provides sufficient strength to protect internal circuits and structures.

The conventional thin shell is made by a simple and rapid forging method, and the flat billet is heated and placed between the two molds, and is pressed by two molds to form a thin shell, and then cooled to complete the production. However, in the cooling process, the flat-shaped blank formed by the simple and rapid forging method tends to warp the thin casing due to the relationship between the processing stress and the thermal stress, resulting in difficulty in subsequent assembly, and moreover, formation. Defective products have greatly increased the non-performing rate and increased manufacturing costs.

In view of this, the main object of the present invention is to provide a thin casing system. The manufacturing method and the product thereof can prevent the thin casing from being warped during the cooling process after forging.

In order to achieve the above object, the present invention provides a method for manufacturing a thin casing for pressing a flat sheet material into a thin casing, comprising the following steps: A, providing a set of molds, the set of molds having a first a mold and a second mold, the forming surface of at least one of the first mold and the second mold is provided with at least one groove; B, preheating the billet to a forming temperature, and placing Between the first mold and the second mold; C, controlling the first mold to press the second mold to form the blank; D, obtaining a semi-finished product of the thin shell after demolding, and the thin shell The semi-finished product of the body is formed with at least one reinforcing rib at least one groove; E, cooling the semi-finished product of the thin casing to room temperature; and F, removing the reinforcing rib on the semi-finished product of the thin casing to obtain the thin shell body.

Wherein, in step F, the reinforcing rib is removed by milling.

Wherein, the forming surface of the first mold and the second mold are provided with at least one groove; the groove of the second mold is located at a position facing the groove of the first mold.

Wherein, after step E, a deburring step is further included to remove the burrs of the semi-finished edge of the thin casing.

The number of the at least one groove is plural, and the plurality of grooves are disposed in an equally spaced manner.

The number of the at least one groove is plural, and the plurality of grooves are disposed at unequal intervals.

The number of the at least one groove is plural, and the plurality of grooves are disposed to cross each other.

Wherein, the billet is an aluminum alloy, and in the step C, the forming temperature is 400 to 530 °C.

Wherein, the billet is a magnesium alloy, and in the step C, the forming temperature is 250 to 360 °C.

The present invention provides a thin casing having two parallel wide sides, and at least one of the wide sides has at least one retention zone; the grain flow direction of the thin casing cross-section is flat, to the location of the root zone The grain flow direction is wavy.

Wherein, the thin shell is discontinuous at the position of the root zone and the grain flow direction on the broad surface.

Wherein, the two broad sides respectively have at least one retention zone, and the grain flow direction of the thin shell cross section is flat, and the grain flow direction at the position of the root width of the two wide sides is wavy.

Wherein, the thin casing has discontinuous grain flow directions at the positions of the two wide and wide root regions and on the surface of the two wide surfaces.

Thereby, the thin casing manufactured by the manufacturing method of the thin casing, the semi-finished product of the thin casing is balanced in contraction stress during cooling, so that the thin casing does not Warp is produced.

In order that the present invention may be more clearly described, the preferred embodiments are illustrated in the accompanying drawings.

The manufacturing method of the thin-shaped casing of the first preferred embodiment of the present invention is for pressing a flat-shaped blank into a thin casing. In the embodiment, the blank is taken as an example of an aluminum alloy plate, and the manufacturing method is the same. Contains the following steps as shown in Figure 1:

A. Referring to FIG. 2, a set of molds 10 is provided. The set of molds 10 has a first mold 12 and a second mold 14. The first mold 12 and the second mold 14 are disposed opposite to each other, in this embodiment. A plurality of equally spaced grooves 12a are formed on the forming surface of the first mold 12.

B. Taking an aluminum alloy plate 20, the aluminum alloy plate 20 has two first faces 20a and a second face 20b that are wide and parallel to each other. The aluminum alloy plate 20 is preheated to a forming temperature and placed between the first mold 12 and the second mold 14. The first surface 20a of the aluminum alloy plate 20 faces the first mold 12, the aluminum alloy The second side 20b of the plate 20 faces the second mold 14. In the present embodiment, the preferred forming temperature is 480 ° C, but not limited thereto. The design of the thin shell of different structures and the alloy composition are different, so that the grain sliding force is different during forming, and the forming temperature range is different. Between 400~530 °C.

C. Controlling the first mold 12 and the second mold 14 to press the aluminum alloy flat plate 20 (refer to FIG. 3).

D. After the demolding, the semi-finished product of the thin shell (ie, the forged embryo) is obtained. A plurality of reinforcing ribs 22b (refer to FIG. 4) are formed by embossing a plurality of recesses 12a on the semi-finished product 22 of the thin casing.

E. The semi-finished product 22 of the thin casing is cooled to room temperature, and during the cooling process, the contraction stress is balanced by the support of the plurality of reinforcing ribs 22b, thereby effectively preventing the semi-finished product 22 of the thin casing from being warped. Referring to FIG. 4 and FIG. 5, the semi-finished product 22 of the thin-shell having a completed cooling has the following characteristics:

1. The semi-finished product 22 of the thin casing has two first faces 22a and a second face 22c which are wide and parallel to each other, and the material of the first face 20a of the aluminum alloy plate 20 is pushed to the first die. The recess 12a of the semi-finished product 22 of the thin casing 22 has a plurality of reinforcing ribs 22b complementary to the grooves 12a of the first mold 12, and the plurality of reinforcing ribs 22b are first along the first surface 22a. The direction D1 is formed.

2. The semi-finished product 22 of the thin casing is in a cross section in a second direction D2, and the grain flow at a position corresponding to the plurality of reinforcing ribs 22b is wavy, wherein the second direction D2 The lines intersect in the first direction D1 and are parallel to the first surface 22a and the second surface 22c.

The shrinkage stress of the semi-finished product 22 of the thin casing during the cooling process is balanced in the first direction D1 and the second direction D2, so that the semi-finished product 22 of the thin casing is not warped.

F. The thin casing is obtained after removing the reinforcing rib 22b on the semi-finished product 22 of the thin casing. In this embodiment, the plurality of reinforcing ribs 22b are milled. The way of cutting is removed. Referring to Figures 6 and 7, the thin housing 24 has the following features:

1. The thin casing 24 has two first faces 24a and a second face 24c which are wide and parallel to each other. The first face 24a of the thin casing 24 has a plurality of root zones 24b, the plurality of roots. The retaining zone 24b is the position of the plurality of reinforcing ribs 22b on the semi-finished product 22 of the thin casing 24 (shown imaginarily in Fig. 7) before milling. The grain flow direction of the cross section of the thin casing 24 in the second direction D2 is flat, and the grain flow direction at the position of the root retention zone 24b is wavy.

2. The thin casing 24 is in a state in which the flow direction of the crystal grains on the surface of the first surface 24a is discontinuous at the position of the plurality of root retention regions 24b.

In the first preferred embodiment described above, the number of the plurality of grooves 12a is set according to the size of the aluminum alloy plate 20. The semi-finished product 22 of the thin casing 24 can balance the contraction stress through the support of the plurality of reinforcing ribs 22b during the cooling process, thereby effectively avoiding warpage, and removing the plurality of reinforcing ribs 22b by milling, thereby obtaining warp-free Thin housing 24.

Further, other specific embodiments capable of achieving the same effects described above are provided, wherein: FIG. 8 and FIG. 9 show a thin casing 30 manufactured by the method for manufacturing the thin casing of the second preferred embodiment of the present invention, which also has two a first surface 30a and a second surface 30c which are wide and parallel to each other, and having a first surface 30a having a plurality of root regions 30b on the first surface 30a, the plurality of root regions 30b being the thin shell The position of the plurality of reinforcing ribs 32b on the semi-finished product 32 of the body 30 before milling. Different from the above first preferred embodiment, in the embodiment, the plurality of grooves on the first mold have a deeper depth, so that the height of the formed plurality of reinforcing ribs is higher, thereby increasing the height The supporting force of the plurality of reinforcing ribs 32b on the first face 32a of the semi-finished product 32 of the thin casing 30. In addition, in order to prevent the semi-finished product 32 of the thin casing 30 from forming a depression recessed into the second surface 32c on the second surface 32c relative to the reinforcing rib 32b after forming, the forming surface of the second mold is formed. Further, a plurality of grooves are disposed, the plurality of grooves are located at a position facing the plurality of grooves of the first mold, and the groove depth on the second mold is smaller than the concave on the first mold The groove depth, whereby the opposing mass flow of the first face 32a can be balanced to avoid the formation of depressions in the second face 32c. The plurality of grooves of the second mold cause the formed semi-finished product 32 of the thin casing 30 to form a plurality of reinforcing ribs 32d on the second surface 32c thereof.

Then, the plurality of reinforcing ribs 32b and the plurality of reinforcing ribs 32d are removed by milling to obtain the thin casing 30. The body 30 also has a plurality of root regions 30d on the second surface 30c of the thin casing, and the plurality of root regions 30d are a plurality of reinforcing ribs on the second surface 32c of the semi-finished product 32 of the thin casing 30. 32d position before milling. Similarly, the grain flow direction of the cross-section of the thin casing 30 is flat, and the grain flow direction at the position of the root zone 30b and the root zone 30d is wavy, and the thin casing 30 is The grain flow direction at the position of the root land 30b and the root land 30d and on the surfaces of the first surface 30a and the second surface 30c is discontinuous.

It is further worth mentioning that the reinforcing rib 32d on the second surface 32c of the semi-finished product 32 of the thin casing 30 also has the effect of reinforcing the supporting force to avoid the warpage of the semi-finished product 32 of the thin casing 30, and the warpage can be obtained. Thin shell 30.

10 and FIG. 11 show a thin casing 40 manufactured by the method for manufacturing a thin casing according to a third preferred embodiment of the present invention, which is different from the first preferred embodiment in that: The grooves are arranged in a manner that the contraction stress balance is unequally spaced, and unequal-spaced reinforcing ribs 52a are formed along the first direction D1 on the formed semi-finished product 42 of the thin casing 40. Similarly, in the second direction D2, the grain flow direction at the position corresponding to the plurality of reinforcing ribs 52a is wavy (refer to Fig. 10).

Then, the plurality of reinforcing ribs 52a are removed by milling, that is, the thin casing 40 (refer to FIG. 11) body 40 is obtained. A plurality of root regions 40b are formed on the first surface 40a of the thin casing 40, and the plurality of strand regions 40b are positions before the plurality of reinforcing ribs 42a on the semi-finished product 42 of the thin casing 40 are milled. The grain flow direction of the cross section of the thin casing 40 in the second direction D2 is flat, and the grain flow direction at the position of the root retention zone 40b is wavy. The thin casing 40 is in a state in which the flow of the crystal grains on the surface of the first surface 40a is discontinuous at the position of the plurality of root regions 40b.

12 and FIG. 13 show a thin casing 50 manufactured by the method for manufacturing a thin casing according to a fourth preferred embodiment of the present invention, which differs from the foregoing embodiments in a plurality of the first molds 12. The grooves are arranged to intersect each other, and a plurality of mutually complementary patches are formed on the semi-finished product 52 of the formed thin casing 50. Strong ribs (refer to Figure 12). Wherein: the plurality of reinforcing ribs includes a plurality of first reinforcing ribs 62a and a plurality of second reinforcing ribs 62b, wherein the plurality of first reinforcing ribs 62a are formed along the first direction D1, and the plurality of second reinforcing ribs 62b are along the second The direction D2 is formed; the semi-finished product 52 body 50 of the thin casing 50 is in the second direction D2, and the grain flow direction corresponding to the position of the plurality of first reinforcing ribs 62a is wavy; the semi-finished product 52 of the thin casing 50 is The grain flow direction at the position of the plurality of second reinforcing ribs 62b in the first direction D1 is also wavy.

Next, the plurality of first reinforcing ribs 62a and the plurality of second reinforcing ribs 62b are removed by milling to obtain the thin casing 50. Referring to FIG. 13, the thin casing 50 has a plurality of root regions 50b on the first surface 50a thereof. The plurality of root regions 50b are the plurality of first reinforcing ribs 52a on the semi-finished product 52 of the thin casing 50. The position of the plurality of second reinforcing ribs 52b before milling.

The flow direction of the grain in the cross section of the thin shell 50 in the first direction D1 is flat, and the flow direction of the grain to the root stub 50b is wavy; the thin shell 50 is in the second direction D2 The grain flow direction of the cross section is flat, and the grain flow direction to the plurality of root retention regions 50b is wavy. And the thin shell 50 is in a discontinuous state at the position of the root dead zone 50b and the grain flow direction on the surface of the first surface 50a.

It should be noted that, in each of the above embodiments, the grooves of the first mold are disposed at equal intervals, unequal intervals, or intersecting each other, and the number of the grooves and the spacing thereof are determined by the size of the aluminum alloy plate. The purpose is to set the groove The semi-finished product placed in the thin casing is prone to warp, whereby a plurality of reinforcing ribs formed by pressing the composite shape can balance the shrinkage stress of the semi-finished product of the thin casing during the cooling process, avoiding warpage and removing the reinforcing ribs. A thin housing without warping can be obtained.

In the above first to fourth preferred embodiments, the billet may also be a magnesium alloy flat plate, and the forming temperature of the magnesium alloy flat plate is 300 ° C, and the crystal grains are formed according to the design of the thin shell of different structures and the alloy composition. The sliding force is different, and the forming temperature ranges from 250 to 360 °C.

In addition, the first to fourth preferred embodiments described above are formed by a closed mold forging process, and can also be fabricated by open die forging; if open die forging is used, the semi-finished product of the thin casing can be cooled simultaneously. A deburring step is performed to remove the burrs of the semi-finished edges of the thin casing.

The above description is only a preferred embodiment of the present invention, and the method and equivalent structural changes of the present invention and the scope of the patent application are intended to be included in the scope of the present invention.

10‧‧‧Mold

12‧‧‧First mould

12a‧‧‧ Groove

14‧‧‧Second mold

20‧‧‧Aluminum alloy plate

20a‧‧‧ first side

20b‧‧‧ second side

22‧‧‧Semi-finished products

22a‧‧‧ first side

22b‧‧‧Reinforced ribs

22c‧‧‧ second side

24‧‧‧ Thin shell

24a‧‧‧ first side

24b‧‧‧ Roots

24c‧‧‧ second side

30‧‧‧Thin shell

30a‧‧‧ first side

30b‧‧‧ Roots

30c‧‧‧ second side

30d‧‧‧ Roots

32‧‧‧Semi-finished products

32a‧‧‧ first side

32b‧‧‧Reinforced ribs

32c‧‧‧ second side

32d‧‧‧Reinforced ribs

40‧‧‧Thin shell

40a‧‧‧ first side

40b‧‧‧ Roots

42‧‧‧Semi-finished products

42a‧‧‧Reinforced ribs

50‧‧‧ Thin shell

50a‧‧‧ first side

50b‧‧‧ Roots

52‧‧‧Semi-finished products

52a‧‧‧First reinforcing ribs

52b‧‧‧Second reinforcing ribs

D1‧‧‧ first direction

D2‧‧‧ second direction

1 is a flow chart of a method for manufacturing a thin casing according to a first preferred embodiment of the present invention; FIG. 2 is a schematic view showing a configuration of a die and an aluminum alloy plate according to a first preferred embodiment of the present invention; FIG. 3 is a first preferred embodiment of the present invention. FIG. 4 is a schematic perspective view of a thin-shell semi-finished product according to a first preferred embodiment of the present invention; FIG. 5 is a schematic view showing the flow direction of a thin-shell semi-finished product according to a first preferred embodiment of the present invention; 6 is a schematic perspective view of a thin casing according to a first preferred embodiment of the present invention; FIG. 7 is a schematic view showing a flow direction of a thin casing according to a first preferred embodiment of the present invention; and FIG. 8 is a second preferred embodiment of the present invention. FIG. 9 is a schematic perspective view of a thin casing of a second preferred embodiment of the present invention; FIG. 10 is a schematic perspective view of a thin casing semi-finished product according to a third preferred embodiment of the present invention; FIG. FIG. 12 is a schematic perspective view of a thin casing semi-finished product according to a fourth preferred embodiment of the present invention; and FIG. 13 is a thin type according to a fourth preferred embodiment of the present invention; Shell Body diagram.

Claims (13)

A method for manufacturing a thin shell for pressing a flat sheet of billet into a thin shell, comprising the steps of: A, providing a set of molds, the set of molds having a first mold and a second mold, Forming a mold surface of at least one of the first mold and the second mold is provided with at least one groove; B, preheating the blank to a forming temperature, and placing the first mold and the second mold C, controlling the first mold to press the second mold to form the blank; D, obtaining a semi-finished product of the thin shell after demolding, and the semi-finished product of the thin shell corresponds to at least one groove Forming at least one reinforcing rib; E, cooling the semi-finished product of the thin casing to room temperature; and F, removing the reinforcing rib on the semi-finished product of the thin casing to obtain the thin casing. A method of manufacturing a thin casing according to claim 1, wherein the reinforcing rib is removed by milling in step F. The manufacturing method of the thin casing according to claim 1, wherein the forming surface of the first mold and the second mold are provided with at least one groove; the groove of the second mold is located with the first mold The position where the grooves face each other. The method of manufacturing a thin casing according to claim 1, wherein after the step E, a deburring step is further included to remove the burrs of the semi-finished edge of the thin casing. The method of manufacturing a thin casing according to claim 1, wherein the number of the at least one groove is plural, and the plurality of grooves are disposed at equal intervals. The method of manufacturing a thin casing according to claim 1, wherein the number of the at least one groove is plural, and the plurality of grooves are disposed at unequal intervals. The manufacturing method of the thin casing according to claim 1, wherein the number of the at least one groove is plural, and the plurality of grooves are disposed to intersect each other. The method of manufacturing a thin casing according to claim 1, wherein the billet is an aluminum alloy, and in the step C, the forming temperature is 400 to 530 °C. The method of manufacturing a thin casing according to claim 1, wherein the billet is a magnesium alloy, and in the step C, the forming temperature is 250 to 360 °C. A thin casing having two parallel wide sides, and at least one of the wide sides has at least one retention zone; the grain direction of the thin casing cross-section is flat, and the crystal is located at the location of the root zone The flow direction of the particles is wavy. The thin casing of claim 10, wherein the thin casing is discontinuous at the root zone location and the grain flow direction on the broad surface. The thin casing of claim 10, wherein the two wide sides respectively have at least one retention zone, and the grain flow direction of the thin casing cross section is flat, to the position of the root zone of the two wide sides The grain flow direction is wavy. The thin casing of claim 12, wherein the thin casing is discontinuous in the flow direction of the two wide-width root regions and on the surface of the two wide surfaces.