WO2017067004A1

WO2017067004A1 - Method and mold for machining housing having side protrusion

Info

Publication number: WO2017067004A1
Application number: PCT/CN2015/092747
Authority: WO
Inventors: 王卫军
Original assignee: 华为技术有限公司
Priority date: 2015-10-23
Filing date: 2015-10-23
Publication date: 2017-04-27
Also published as: CN107530841B; CN107530841A

Abstract

A method for machining a housing having a side protrusion, comprising: performing stepped deep drawing on a sheet material (50) to obtain a housing having side walls (52), a bottom (53), and an opening (510), wherein rounded corners are formed between the side walls (52) and the bottom (53), and a deep-drawn step (55) having the height of a side protrusion is formed on the side wall (52); pressing the side walls (52) backward to decrease the rounded corners between the side walls (52) and the bottom (53), such that the thickness at the rounded corners subsequent to the backward pressing is sufficient for computer numerical control (CNC) machining; performing necking on the opening of the deep-drawn step (55), such that the inner side surface and outer side surface of the opening of the deep-drawn step (55) are respectively flush with the inner side surface and outer side surface of the opening of the side walls connected with the deep-drawn step (55); and performing CNC machining on the deep-drawn step (55) to obtain a housing having target dimensions. Moreover, a mold for machining a housing having a side protrusion is provided. The machining method can reduce the allowance for CNC machining, thereby decreasing the machining deformation caused by residual stresses generated by plenty of CNC machining, and meanwhile saves the sheet material, thereby reducing machining costs.

Description

Processing method and mold for housing with side protrusion

Technical field

The present invention relates to the field of terminal electronic products, and more particularly to a method and a mold for processing a housing having side projections.

Background technique

In the field of electronic products, consumer products such as mobile phones and tablets are increasingly using metal-like parts to increase the metal texture, three-dimensional curvature and local characteristics of the products.

In the processing technology of the existing metal appearance parts, the processing method of the side protrusion of the appearance part is: directly processing the board by using a computer numerical control machine tool (CNC) processing technology, thereby obtaining the shell and the shell The upper side is convex; the other processing method is: first, the sheet is punched and drawn to form a sidewall on the sheet; then the sidewall is processed by a CNC machining process, so that the sidewall has a target size side surface. Raised.

When the sheet material is processed by the above-described processing method to obtain a shell having side protrusions, since the side protrusions are completely produced by CNC machining, the above-described processing method makes the CNC processing amount large, and a large amount of CNC machining residues Stress can cause processing distortion; on the other hand, waste of raw materials makes processing cost high.

Summary of the invention

The invention provides a processing method and a mold for a shell with side protrusions, which can reduce the machining allowance of the CNC, thereby reducing the processing deformation caused by the residual stress generated by a large number of CNC machining, and also save the sheet material and reduce the processing cost.

In a first aspect, the present invention provides a method of processing a housing having side projections, comprising: stepping a flat sheet to obtain a housing including a side wall, a bottom portion and a mouth portion, the side wall and Forming a rounded corner between the bottom portions, and forming a drawing step having a height of a side protrusion on the side wall; reversing the side wall to reduce the rounded corner so that the rounded corner after the backing The thickness is sufficient for performing CNC machining; and the mouth portion of the drawing step is subjected to a shrinking process such that the inner side surface of the mouth portion of the drawing step is flush with the inner side surface of the side wall of the side wall to which the drawing step is connected The outer side surface of the mouth portion of the drawing step is flush with the outer side surface of the mouth portion of the side wall connected to the drawing step; and the housing is subjected to CNC machining to obtain a housing having a target size.

In conjunction with the first aspect, in a first possible implementation of the first aspect, the thickness of the planar sheet is less than or equal to the height of the side projections.

With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the drawing step and the sidewall between the two sides of the drawing step are The large arc transition prevents the deep rounding of the rounded corner between the drawing step and the bottom.

With reference to the first aspect or any one of the first to the second aspects of the first aspect, in a third possible implementation manner of the first aspect, the neutral layer unfolding length ratio of the drawing step The neutral layer of the non-draw step corresponding to the deep drawing step has a long unfolding length, and the difference between the unfolding length of the neutral layer of the drawing step and the unfolding length of the non-deep step is less than or equal to 0.05 mm. .

In conjunction with the first aspect, or any one of the first to third aspects of the first aspect, in a fourth possible implementation of the first aspect, the amount of backlash of the sidewall is less than or equal to 1 mm.

In a second aspect, the present invention provides a mold for processing a housing having side projections, comprising: a stepped drawing module for stepping a flat sheet to obtain a side wall, a bottom and a mouth a casing having a rounded corner formed between the side wall and the bottom portion, and a drawing step having a height of a side protrusion formed on the side wall; a back-squeeing module for retracting the side wall to reduce The rounded corners are such that the thickness of the rounded corners after the back-squeezing is sufficient for CNC machining; the shrinking module is configured to perform a shrinking process on the mouth of the drawing step, so that the mouth of the drawing step is An inner side surface of the inner side surface of the side wall of the side wall connected to the drawing step is flush, and an outer side surface of the opening portion of the drawing step is flush with an outer side surface of the side wall of the side wall connected to the drawing step CNC for machining the housing to obtain a housing having a target size.

In conjunction with the second aspect, in a first possible implementation of the second aspect, the thickness of the planar sheet is less than or equal to the height of the side protrusions.

With reference to the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the drawing step and the sidewall between the two sides of the drawing step are The large arc transition prevents the deep rounding of the rounded corner between the drawing step and the bottom.

With reference to the second aspect or any one of the first to the second aspects of the second aspect, in a third possible implementation manner of the second aspect, the neutral layer unfolding length ratio of the stretching step The neutral layer of the non-draw step corresponding to the deep drawing step has a long unfolding length, and the difference between the unfolding length of the neutral layer of the drawing step and the unfolding length of the non-deep step is less than or equal to 0.05 mm. .

In conjunction with the second aspect or any one of the first to third possible implementations of the second aspect, in a fourth possible implementation of the second aspect, the amount of backlash of the sidewall is less than or equal to 1 mm.

According to the technical solution of the present invention, the sheet material is first processed into a casing including a bottom portion and a side wall by using a step-type drawing process, and a drawing step having a height of the side protrusion is formed on the side wall, and then a back-squeezing process is used. The shrinking process and the CNC process process the deep drawing step to obtain a housing with side protrusions to reduce the machining allowance of the CNC, thereby reducing the machining deformation caused by the residual stress generated by a large number of CNC machining; Reduce processing costs.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

Figure 1 is a schematic illustration of an electronic product housing having side projections.

2 is a schematic view showing the effect of processing a housing having side projections using a CNC process in the prior art.

3 is a schematic view showing the effect of processing a housing having side projections using a stamping drawing and a CNC process in the prior art.

4 is a schematic flow chart of a method of processing a housing having side projections in accordance with one embodiment of the present invention.

Fig. 5 is a schematic view showing the effect of stepped drawing of a flat sheet material in a processing method of a housing having side projections according to an embodiment of the present invention.

Fig. 6 is a view showing the effect of back-squeezing the side wall in the processing method of the housing having the side projections according to an embodiment of the present invention.

Fig. 7 is a view showing the effect of shrinking the drawing step in the processing method of the housing having the side projections according to an embodiment of the present invention.

Figure 8 is a schematic frame view of a mold for processing a housing having side projections in accordance with one embodiment of the present invention.

Figure 9 is a schematic view showing the structure of a back-squeezing module for processing a mold having a side convex housing according to an embodiment of the present invention.

Figure 10 is a schematic view showing the structure of a necking module in a mold for processing a housing having side projections according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Figure 1 includes a cross-sectional view and a top view of a housing having side projections. The right side view of Fig. 1 is a plan view of the housing, and the left side view is a cross-sectional view of the right side housing in the A-A direction.

The housing shown in the top view on the right side of Figure 1 includes a bottom portion 10 and side walls 11 with side projections 12 thereon. The solid line 13 is the outer contour line of the side wall 11 and the broken line 14 is the inner contour line of the side wall 11. In the cross-sectional view on the left side in Fig. 1, the solid line 15 is the outline of the mouth of the casing.

The shape of the housing shown in Fig. 1 is only an example for better understanding of the embodiment of the present invention, and the shape of the housing described in the embodiment of the present invention should not be limited.

The diagram on the left side of Fig. 2 is a schematic view of the shape of the pre-processed sheet material 20, which is a block-shaped sheet material. 2 is a cross-sectional view of the housing having side projections 21 after CNC machining, the cross-sectional view including only the side projections 21 and the partial bottom portions 22, respectively corresponding to the side projections 12 and the bottom portion 10 of FIG. portion. As can be seen from Fig. 2, in the prior art, when the planar plate is only subjected to CNC machining to obtain a casing having side projections, the amount of CNC machining is large, and raw materials are wasted.

FIG. 3 is a schematic view showing the effect of processing a housing having side protrusions using a stamping drawing and a CNC process in the prior art.

3 is a schematic view showing the shape of a casing having a side wall 30 and a bottom portion 31 obtained by press working a flat plate material, and the right side view is obtained by CNC machining the casing shown on the left side. A partial cross-sectional view of the housing of the side projections 32, the cross-sectional view including only the side projections 32 and the portion of the bottom portion 31' after the CNC machining, corresponding to the side projections 12 and a portion of the bottom portion 10 of FIG. 1, respectively.

As can be seen from Figure 3, the thickness of the sheet used for processing must be greater than the height of the side projections. That is, if the height of the side projections is 1.4 mm, the thickness of the sheet material must be greater than 1.4 mm.

The above-mentioned processing method for the sheet material having a thickness larger than the height of the side protrusions has a large amount of CNC processing, and the residual stress of the CNC processing is large, so that a large amount of CNC processing is liable to cause processing deformation; and the above processing method wastes raw materials, so that the processing cost high.

S410, performing step-type drawing on the flat plate to obtain a casing including a side wall and a bottom, and the side wall and the bottom are formed with rounded corners, and the side wall is formed with a drawing step having a height of the side protrusion. The flat plate may be a metal flat plate such as a steel piece or a copper piece.

S420, retreating the side wall to reduce the rounded corner between the side wall and the bottom, so that the thickness of the rounded corner after the backing is sufficient for CNC machining.

S430, performing a shrinking process on the mouth of the drawing step, so that the inner side surface of the mouth portion of the drawing step is flush with the inner side surface of the side wall connected to the drawing step, and the outer side surface of the mouth portion of the drawing step is The outer side of the side wall to which the deep steps are connected is flush.

S440, performing CNC machining on the casing to obtain a casing having a target size.

According to the technical solution of the present invention, the planar plate material is first processed into a casing including a bottom portion and a side wall by using a step-type drawing process, and a drawing step having a height of the side protrusion is formed on the side wall, and then the back-squeezing process is used. The shrinking process and the CNC process process the deep drawing step to obtain a housing having a side protrusion, so that the sheet having a thickness equal to or smaller than the side protrusion can be processed to obtain a housing having a side protrusion. In order to reduce the machining allowance of CNC, and thus reduce the processing distortion caused by the residual stress generated by a large number of CNC machining; at the same time, it can save sheet material and reduce processing cost.

It should be understood that the drawing step and the side protrusion formed on the side wall are all part of the side wall, so that the drawing step and the side protrusion are also the side walls in a broad sense.

In the embodiment of the present invention, the method for processing the housing having the side protrusions can process the flat sheet material having a thin thickness, that is, the thickness of the sheet material depends on the thickness of most of the area of the housing product, rather than depending on the side protrusion. the height of. If the thickness of the bottom of the casing product is 1.0 mm and the height of the side projections is 1.4 mm, the sheet having a thickness of 1.0 mm can be processed to obtain a casing having a side projection having a height of 1.4 mm.

When the technical method according to the embodiment of the present invention processes a sheet having a thickness less than or equal to the height of the side protrusion of the casing, it is possible to ensure that the CNC processing is not required at a large area of the sheet, thereby reducing the CNC machining allowance and reducing the amount of the machining. The residual stress generated by CNC machining is a problem that causes machining deformation and poor flatness, while saving sheet material and reducing processing costs.

Optionally, as another embodiment, when the flat plate is stepped deep so that a drawing step having a height of the side protrusion is formed on the side wall, the drawing step and the side wall on both sides of the drawing step may be In order to pass through a large arc transition, to avoid serious deep drawing marks on the rounded corner between the drawing step and the bottom.

The larger arc in the embodiment of the present invention includes an arc whose arc is within a certain upper threshold to a lower threshold, and the upper threshold and the lower threshold depend on the thickness of the planar sheet. For example, when the material thickness of the flat sheet is 1 mm, the upper threshold is R3, and the lower threshold is R6, that is, the arc between the sidewalls on both sides of the drawing step and the drawing step can be arc-shaped in the range of R3 to R6. To avoid serious deep drawing marks on the rounded corner between the deep step and the bottom.

According to an embodiment of the present invention, when the planar sheet material is subjected to step-type drawing processing, the neutral layer unfolding length of the drawing step is longer than the unfolding step neutral layer unfolding length, and the neutral layer unfolding length is longer than the non-deep drawing step The difference in the unfolded length of the neutral layer is less than or equal to 0.05 mm. In this way, after the subsequent deepening step of the drawing step, the opening end surface of the drawing step and the opening end surface of the side wall of the two sides of the drawing step are kept straight.

According to an embodiment of the present invention, when the side wall is back-compressed, the amount of back-squeezing of the side wall may be less than or equal to 1 mm to avoid the occurrence of back-squeezing or uneven color on the top surface of the side wall.

The processing of the present invention will be described in more detail below with reference to the structural schematic of the housing.

Fig. 5 is a schematic view showing the effect of stepped drawing of a flat sheet material in a processing method of a housing having side projections according to an embodiment of the present invention. The upper view in Fig. 5 is a plan view of the planar sheet 50, and the solid line 51 is the outline of the flat sheet 50. The lower right view of Figure 5 is a top view of the housing. The lower left view in Fig. 5 is a left side view of the casing shown in the right lower plan view in the A-A direction.

In S410, the planar plate 50 is stepped deep, and a casing including the side wall 52, the bottom portion 53, and the mouth portion 510 can be obtained. A rounded corner 54 is formed between the side wall 52 and the bottom portion 53 and has a drawing step 55 on the side wall 52.

In addition, when the flat plate 50 is stepped deep so that the drawing step 55 having the height of the side protrusion is formed on the side wall 52, the drawing step 55 and the side wall on both sides of the drawing step can pass through a large The arc 57 transitions to avoid severe deep drawing marks on the fillet 54.

In Fig. 5, the height 56 of the drawing step 55 is the height of the side protrusion to be finally processed; the broken line 58 is used to indicate the length of the neutral layer of the drawing step 55; and the distance (d) 59 is used to indicate the drawing step. The neutral layer unfolding length of the corresponding non-deep step of 55.

In the lower left diagram of FIG. 5, the solid line 511 is the outer side contour of the side wall 52 at the non-deep step, and the solid line 512 is the outer side contour of the drawing step 55.

Optionally, when stepping the flat sheet 50, the neutral layer of the step 55 is drawn. The unfolding length may be longer than the unfolding step of the neutral layer, and the difference between the neutral layer unfolding length and the non-deep step's neutral layer unfolding length may be less than or equal to 0.05 mm, that is, the length of the dotted line 58 is greater than the distance 59. The length is long and the difference between the length of the dashed line 58 and the length of the distance 59 is less than or equal to 0.05 mm. In this way, after the subsequent drawing process of the drawing step 55 is performed, the inner side surface and the outer side surface of the side wall of the side wall of the opening portion 55 of the drawing step 55 and the outer side surface respectively connected to the drawing step 55 are flush. .

It should be understood that the shape of the planar sheet material 50 and the shape of the casing shown in Fig. 5 are merely examples for better understanding of the present invention, and the shape of the flat sheet and the casing in the embodiment of the present invention should not be limited.

After the stepping of the flat sheet is performed to form the side wall and the drawing step, the side wall needs to be backed up.

The left side view of Fig. 6 is a schematic view of the shape of the side wall 52 shown in Fig. 5 before the back-pressing process. In Fig. 6, the rounded corner 54 is a rounded corner between the side wall 52 and the bottom portion 53. The right side view of Fig. 6 is a schematic view showing the shape of the side wall 52 shown on the left side after being subjected to the back-pressing process.

In S420, the side wall 52 is back extruded, and the rounded corners between the side wall 52 and the bottom portion 53 are reduced, so that the thickness of the rounded corner after the backing is sufficient for CNC machining.

The back side of the sidewall is mainly processed to reduce the rounding generated by the drawing, such as reducing the rounded corner 54 in FIG. 6 to ensure that the thickness of the rounded corner after the backing is sufficient for subsequent CNC machining, so that A target size housing is obtained between the side wall and the bottom.

As shown in the figure on the left side of FIG. 6, the drawing step 55 and the bottom portion 53 before the back-pressing process are connected by a rounded corner 54. After the side wall 52 is subjected to the back-squeezing process, as shown in the right side of FIG. 6, the back-extruded side wall 52' and the bottom portion 53 are connected by a sharp corner 54', and the processed side wall 52' is retracted. The difference between the height of the backing and the height of the side wall 52 before the back-pressing process may occur.

The angle formed by the back-squeezing process shown in the right side of Fig. 6 is a sharp angle 54' for better comparison of the effects before and after the back-squeezing process of the side wall. Therefore, the sharp corner 54' shown in Fig. 6 should not limit the shape of the angle formed between the side wall and the bottom portion after the side wall is subjected to the back-squeezing process in the embodiment of the present invention.

Alternatively, the amount of back-injection 61 may be less than or equal to 1 mm to avoid the occurrence of back-squeezing or uneven colors on the top surface of the side wall.

After the side wall of the casing is subjected to the back-squeezing process, the mouth of the drawing step is then subjected to shrinkage processing.

The left side view of Fig. 7 is a partial schematic view of the side wall 52' after the back-squeezing process of S420 of Fig. 4, as shown in the right side of Fig. 6. The right side view of Fig. 7 is a schematic view showing the shape of the mouth portion of the drawing step 55 after the necking process.

In S430, the mouth portion of the drawing step is subjected to a shrinking process such that the inner side surface and the outer side surface of the mouth portion of the drawing step are flush with the inner side surface and the outer side surface of the side wall of the side wall respectively connected to the drawing step. .

As shown in the left side view of Fig. 7, the inner side surface 72 and the outer side surface 512 of the mouth portion of the drawing step 55 before the necking process and the inner side surface 71 of the mouth portion of the side wall on both sides of the stretching step are performed. The side faces 511 are respectively protruded outward. The inner side surface and the outer side surface of the mouth portion of the drawing step 55 after the necking process are respectively retracted inward. As shown in the right diagram of Fig. 7, the inner side surface 71' and the outer side surface 512 of the side wall of the side portion 72' and the outer side surface 512' of the drawing step 5 after the necking process are connected to the drawing step are shown. They are flush.

After the mouth of the drawing step is subjected to the shrinking process, the casing is further subjected to CNC machining so that the dimensions of the various aspects of the casing meet the target requirements.

According to the technical solution of the present invention, the sheet material is first processed into a casing including a bottom portion and a side wall by using a step-type drawing process, and a drawing step having a height of the side protrusion is formed on the side wall, and then a back-squeezing process is used. The drawing process and the CNC process process the drawing step to obtain a housing having a side protrusion, so that the sheet having a thickness equal to or smaller than the side protrusion can be processed to obtain a housing having a side protrusion, Reduce the machining allowance of CNC, and thus reduce the machining deformation caused by the residual stress generated by a large number of CNC machining; at the same time save plate material and reduce processing cost.

The processing method of the housing with the side protrusions and the effect comparison diagram during the processing according to the embodiment of the present invention are described in detail above with reference to FIG. 4 to FIG. 7 , and the following is used in the embodiment of the present invention with reference to FIGS. 8 to 10 . A partial module in a mold for machining a housing having a side projection is described in detail.

Figure 8 is a schematic frame view of a mold 800 for processing a housing having side projections in accordance with one embodiment of the present invention.

As shown in FIG. 8, the mold 800 includes a stepped drawing module 810, a back extrusion module 820, a necking module 830, and a CNC 840.

The stepped drawing module 810 is used for stepping the flat plate to obtain a casing including a side wall and a bottom. The side wall and the bottom are rounded, and the side wall is formed with a height of the side protrusion. Deep steps. The flat sheet may be a metal flat sheet, for example, a steel sheet, a copper sheet or the like.

The back extrusion module 820 is used for back-squeezing the side walls to reduce the rounded corners formed between the side walls and the bottom portion, so that the material thickness of the rounded corners is sufficient for CNC machining.

The necking module 830 is configured to perform a shrinking process on the mouth of the drawing step such that the inner side surface and the outer side surface of the mouth portion of the drawing step are flush with the inner side surface and the outer side surface of the side wall respectively connected to the drawing step.

The CNC 840 is used for CNC machining of the housing to obtain a housing having a target size.

In the mold of the present invention, the plate is first processed into a casing including a bottom portion and a side wall by using a step type drawing module, and a drawing step having a height of the side protrusion is formed on the side wall, and then the back extrusion module and the neck are used. The module and the CNC machining module process the deep drawing step to obtain a side convex curved shape, so that the plate having a thickness equal to or smaller than the side convex height can be processed to obtain a housing having a side convex shape to reduce the CNC machining. The balance, in turn, reduces the machining distortion caused by the residual stress generated by a large number of CNC machining; at the same time, it saves plate material and reduces processing cost.

In the embodiment of the invention, the mold for processing the housing having the side protrusions can process the thin plate material, that is, the thickness of the plate material depends on the thickness of the large area of the casing product, rather than depending on the side protrusion. height. If the thickness of the bottom of the casing product is 1.0 mm and the height of the side projections is 1.4 mm, the sheet having a thickness of 1.0 mm can be processed to obtain a casing having a side projection having a height of 1.4 mm.

When the mold of the embodiment of the present invention is used to process a sheet having a thickness less than or equal to the height of the side protrusion of the casing, it is ensured that the large area of the sheet is not subjected to CNC machining, thereby reducing the CNC machining allowance and reducing the large amount of CNC. Residual stress generated by machining to the problem of processing deformation and poor flatness, while saving sheet material and reducing processing costs.

When the stepped drawing is performed on the sheet by using the step type drawing module 810, when the drawing step is formed on the side wall with the height of the side protrusion, the drawing between the drawing step and the side wall on both sides of the drawing step can be relatively large. Arc transitions to avoid severe deep drawing marks on the rounded corners between the sidewall and the bottom.

Optionally, according to an embodiment of the present invention, when the stepped drawing process is performed on the sheet material by using the step type drawing module 810, the developed layer has a developed layer having a longer development length than the non-draw stepped neutral layer. And the difference between the unfolding length of the neutral layer of the drawing step and the unfolding length of the neutral layer of the non-deep step may be less than or equal to 0.05 mm. In this way, after the subsequent deepening of the drawing step, the opening end surface of the drawing step and the opening end surface of the side wall on both sides of the drawing step can be kept straight.

Alternatively, when the back side of the housing is back-pressed using the back-squeeing module 820, the amount of back-squeezing of the side wall may be less than or equal to 1 mm to avoid the occurrence of back-squeezing or uneven colors on the top surface of the side wall.

Figure 9 is a schematic view showing the structure of a back-squeezing module for processing a mold having a side convex housing according to an embodiment of the present invention. The back extrusion module 820 in the processing apparatus shown in FIG. 8 may be the back extrusion module shown in FIG. S420 of Fig. 4 can be performed using the back extrusion module shown in Fig. 9 to achieve the effect of the back extrusion process shown in Fig. 6.

The back-squeezing module shown in FIG. 9 includes an upper die 91, a punch 92, a lower die 93, a reverse squeegee 94, and a lower die plate 96. The portion of the backslash 95 in the figure indicates the housing for the back extrusion process. The upper mold 91, the lower mold 93 and the punch 92 are used to fix the casing, the lower mold plate 96 is used to fix the lower mold 93, and the reverse crushing blade 94 is used to fix the casing in the upper mold 91, the lower mold 93, and the male mold 92. The side walls of the casing are backed up to form a casing as shown in FIG.

Figure 10 is a schematic view showing the structure of a necking module in a mold for processing a housing having side projections according to an embodiment of the present invention. The necking module 830 in the mold shown in FIG. 8 may be the necking module shown in FIG. S430 in Fig. 4 can be performed using the necking module shown in Fig. 10 to achieve the processing effect shown in Fig. 7.

The necking module shown in FIG. 10 includes an upper die 101, a slider body 102, a slider 103, and a neck slider 104. The portion of the back oblique line 105 in Fig. 10 indicates the housing for performing the necking process. The upper mold 101, the slider main body 102, and the slider 103 are used to fix the housing, and the constricting slider is used to perform the mouth of the stretching step when the upper mold 101, the slider main body 102, and the slider 103 are fixed to the housing. The pressing is performed such that the inner side surface and the outer side surface of the opening portion of the opening portion of the drawing step are flush with the inner side surface and the outer side surface of the side wall of the side wall respectively connected to the drawing step, thereby obtaining the housing shown in Fig. 7.

It should be noted that Figures 9 and 10 are merely examples to help those skilled in the art to better understand the mold of the present invention, and do not limit the specific form of the mold of the present invention. For example, in the back-pressing mold, a concave mold having the same shape as that of the upper mold and the lower mold may be used to fix the housing with the punch; in the shrink mold, only the slider and the upper mold may be used to fix the housing.

In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method, It can be implemented in other ways.

In addition, each functional module in each embodiment of the present invention may be integrated into one processing device, or each module may exist physically separately, or two or more modules may be integrated into one device.

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

A processing method for a housing having side projections, comprising:

Performing step-type drawing on the flat plate to obtain a casing including a side wall, a bottom portion and a mouth portion, the side wall and the bottom portion are rounded, and the side wall is formed with a deep drawing having a height of the side protrusion Step

Retracting the side wall to reduce the rounded corners, so that the thickness of the rounded corner after the backing is sufficient for CNC machining of the computer numerical control machine tool;

Performing a shrinking process on the mouth portion of the drawing step such that the inner side surface of the mouth portion of the drawing step is flush with the inner side surface of the mouth portion of the side wall of the drawing step, the drawing step The outer side of the mouth is flush with the outer side of the mouth of the side wall to which the deep drawing step is connected;

The casing is subjected to CNC machining to obtain a casing having a target size.
The processing method according to claim 1, wherein the thickness of the planar sheet is less than or equal to the height of the side projections.
The processing method according to claim 1 or 2, wherein the drawing step and the sidewalls on both sides of the drawing step are transitioned by a large arc to avoid the drawing step and the bottom portion The rounded corners appear severely deep drawing marks.
The processing method according to any one of claims 1 to 3, wherein a neutral layer unfolding length of the drawing step is longer than a neutral layer unfolding length of the non-deep step corresponding to the drawing step And a difference between the developed layer of the drawing step and the developed layer of the non-draw step is less than or equal to 0.05 mm.
The processing method according to any one of claims 1 to 4, wherein the amount of back-stretching of the side wall is less than or equal to 1 mm.
A mold for processing a housing having side projections, comprising:

a stepped drawing module for stepping the flat plate to obtain a casing including a side wall, a bottom portion and a mouth portion, the side wall and the bottom portion are rounded, and the side wall is formed with a deep drawing step with a raised height on the side;

Rewinding the module, back-squeezing the side wall, reducing the rounded corners, so that the thickness of the rounded corners after the back-squeezing is sufficient for computer numerical control machine tool CNC machining;

a necking module for performing a shrinking process on the mouth of the drawing step, such that the inner side surface of the mouth portion of the stretching step is flush with the inner side surface of the side wall of the side wall connected to the drawing step The outer side surface of the mouth portion of the drawing step is flush with the outer side surface of the side wall of the side wall connected to the drawing step;

A CNC is used for CNC machining the housing to obtain a housing having a target size.
The mold according to claim 6, wherein the thickness of the planar sheet is less than or equal to the height of the side projections.
The mold according to claim 6 or 7, wherein the drawing step and the side walls of the two sides of the drawing step are transitioned by a large arc to avoid the drawing between the drawing step and the bottom portion. The rounded corners appear severely drawn.
The mold according to any one of claims 6 to 8, wherein a stretching layer has a neutral layer unfolding length longer than a non-deep stepped neutral layer of the side wall, and The difference between the unfolded length of the neutral layer of the deep drawing step and the unfolded length of the neutral layer of the non-draw step is less than or equal to 0.05 mm.
The mold according to any one of claims 6 to 9, wherein the amount of backlash of the side wall is less than or equal to 1 mm.