201200263 六、發明說明： 【發明所屬之技術領域】 本發明係有關於一種具倒凹角之殼件、成形裝置及成 形方法，特別是有關於一種應用電磁脈衝技藝成形的具倒 凹角之殼件、成形裝置及方法。 【先前技術】 請參見圖1A、圖1B，目前具有倒凹角12之殼件11， 特別是在3C電子產品10的應用上，因為具有倒凹角12 之側壁有時會有極淺（約10mm)的下凹深度的電子產品10 殼件11不利於傳統沖壓成形模具設計，在脫模時會在該倒 凹角12的部位卡模或難以組合並沖壓出極淺的凹模，因此 目前該殼件11多為塑膠材質並以射出成形或真空成形工 法所製成。但塑膠殼件11與金屬殼件相較之下，雖具有較 彈性的成形塑性，但卻具有散熱不佳、剛性不足、塑膠感 重等相對性的缺失。 【發明内容】 本發明目的係提供一種以電磁力進行殼件之自由脹形 或靠模成形的成形方法。本發明更包含上述成形方法之裝 置及其製成品。 為提供上述殼件之自由脹形的成形方法，本發明揭示 的成形方法步驟包括：提供一金屬薄板或其複合材所製成 的預成形基材，其具有一形成凹陷部的「内側」及一對應 201200263 於該凹陷部外圍形成一側壁的「外侧」。將預成形基材以凹 陷部面對該線圈固定座設置於一線圈固定座，線圈固定座 具有電性耦接一脈衝電流供應器之一電磁線圈。以一壓塊 抵靠預成形基材之外側，並預留側壁一自由脹形空間。接 通電磁線圈電力以進行電磁脈衝成形，使該側壁外擴而自 由脹形而形成一倒凹角。 為提供上述殼件之靠模成形的成形方法，本發明揭示 的成形方法步驟包括：提供一金屬薄板或其複合材所製成 的預成形基材，其具有一内侧及一外側，内側形成一凹陷 部，外侧對應於凹陷部外圍形成一側壁。將預成形基材置 於一線圈固定座及一分割式成形模具之間，凹陷部係面對 線圈固定座套置，線圈固定座具有電性耦接一脈衝電流供 應器之一電磁線圈，分割式成形模具對應於該側壁處的一 模穴具有一拔模角。提供電磁線圈電力以進行電磁脈衝成 形，使側壁外擴並貼合模穴而形成一對應該拔模角之倒凹 角。 本發明之特點係在於：1.本案利用電磁力進行殼件之 側壁成形，模具與線圈結構簡單，可成形具有倒凹角的殼 件。2.容易進行產品自動化及量化生產。3.尺寸精度高、產 品表面品質佳。 【實施方式】 茲配合圖式將本發明較佳實施例詳細說明如下。 本發明中之電磁脈衝成形係當電磁線圈組接通脈衝電 201200263 流時胚料（預成形基材）會感應產生渦電流並與線圈形成 一互斥電磁力，該互斥力係驅使金屬薄板或其複合材所製 成的預成形基材胚料外擴變形。 圖2A至圖2D繪示本發明一實施例之殼件的成形方法 的結構流程剖面示意圖，本實施例之殼件的成形方法屬於 自由脹形式，成形步驟包括： 請參閱圖2A，首先提供一預成形基材21，該預成形 基材21係為一高導電率之金屬薄板或其複合材所製成，可 以利用新式工法或習知技術之液壓、鑄造或衝壓預先成 形。較佳金屬薄板之製成材料包含鋁合金、積層板(Ti/Al)、 金、銀或銅。複合材可由金屬薄板及橡膠膜所構成、或由 金屬薄板及塑膠膜所構成。預成形基材21具有一内側211 及一外側212，内側211形成一凹陷部2111。在本實施例 中，該凹陷部2111具有正凹角，該凹陷部2111之下凹口 定義出一第一寬度D1。外側212對應於該凹陷部2111的 外圍形成一側壁213。 請參照圖2B，再將該預成形基材21套置於一線圈固 定座30上，其套置方式係將該凹陷部2111 (即内側211) 面對該線圈固定座3 0而設置’該線圈固定座3 0做為成形 過程中承受反作用力之支撐，該線圈固定座30具有一電磁 線圈31，該一電磁線圈31係電性耗接一脈衝電流供應器 32。 再如圖2C所示，續以一壓塊40抵靠該預成形基材21 201200263 ，之外側212而爽緊該預成形基材21於線圈固定座30上， 左塊40内面與預成形基材21之間並預留該側壁213 -自 由脹形空間A。 請參照圖2D，再以脈衝電流供應器32提供該電磁線 圈31脈衝％^力以進行電磁脈衝成形（Eiectromagnetic forming'Magnetic pulse forming)’ 使該側壁 213 自由脹形 而外擴成一已成形基材21a，該已成形基材21a之側壁213 具有一倒凹角214，該倒凹角214造成已成形基材21a之 # 相對兩側壁213之間的一第二寬度D2 (第二寛度D2垂直 於該壓塊40的加壓方向P或退出方向）大於該第一寬度 D1。 圖3A至圖3D繪示本發明另一實施例之殼件的成形方 法的結構流程剖面示意圖。本實施例之殼件的成形方法屬 於靠模成形的成形方式’成形步驟包括： 請參照圖3A ’提供一預成形基材21，該預成形基材 21為一金屬薄板或其複合材所製成，其具有一内侧211及 一外側212，該内側211形成一凹陷部2111。在本實施例 中’該凹陷部2111具有正凹角，該凹陷部2111之下凹口 定義出一第一寬度D1。外側212對應於該凹陷部2111的 外圍而形成一侧壁213。 請續參照圖3B、圖3C，將該預成形基材21以該凹陷 部2111係面對一線圈固定座3〇並套置於該線圈固定座3〇 上’且該預成形基材21位於一分割式成形模具5 0之下， 201200263 並定位該分割式成形模具50，即使得該預成形基材21位 於該線圈固定座30與該分割式成形模具50之間，該線圈 固定座30具有一電磁線圈31，該電磁線圈31電性耦接一 脈衝電流供應器32，該分割式成形模具50對應於該側壁 213處的一模穴51内具有一拔模角52，該拔模角52為負 角。 再該參閱圖3D，利用該脈衝電流供應器32提供該電 磁線圈31電力以進行電磁脈衝成形，使該側壁213外擴並 貼合該模穴51而形成一已成形基材21a，該已成形基材21a 對應於該拔模角52具有一倒凹角214，該倒凹角214造成 已成形基材21a之相對兩側壁213間的第二寬度D2(該第 二寬度D2垂直於該分割式成形模具50的拔模方向）大於 該第一寬度D1。 如圖4所示，上述方法在脫模、並自該線圈固定座30 取出該已成形基材21a後，去除該外圍廢料215 (該外圍 廢料215除了可額外加工去除外，也可利用模具造型設 計，在進行電磁脈衝成形時一併去除，如後述）之後，即 可形成一具倒凹角的殼件20。 另外，在前揭實施例中，該線圈固定座30係以絕緣材 料所製成，較佳者可包括工程塑膠或玻纖樹脂。 如圖5繪示的本發明之殼件的成形裝置第一實施例。 本實施例之電子產品之殼件的成形裝置係適用於對一預成 形基材21之金屬薄板或其複合材的塑形加工成具有倒凹 201200263 角的殼件，該預成形基材21具有一内側211及一外側212, 該内側211形成一凹陷部2111，該外側212對應於該凹陷 部2111外圍形成一側壁213，本實施例之成形裝置包含： 一具有一凸檯301的線圈固定座30，在該凸檯301内部靠 外側處匝設一電磁線圈31，該電磁線圈31電性耦接一脈 衝電流供應器32,並於該線圈固定座30上設置一壓塊40, 其中該預成形基材21係以該内側211對應於該線圈固定座 30的方式套設於該凸檯301上，該壓塊40係抵緊該預成 形基材21之該外側211，且與該外側211相對的該壓塊40 内面預留一自由脹形空間供該侧壁213成形。 如圖6所繪示的本發明之殼件的成形裝置第二實施 例。本實施例與第一實施例的線圈固定座30、凸檯301、 電磁線圈31的條件相似，而以一分割式成形模具50替代 該壓塊40，該分割式成形模具50，係供抵緊該預成形基材 21之該外侧212，該分割式成形模具50之對應於該側壁 213處的一模穴51具有一拔模角52供該預成形基材21成 形貼合，該拔模角52為負角。 如圖7所示，為本發明之殼件的成形裝置第三實施 例。其中該分割式成形模具50之該拔模角52内壁面53外 緣更具有切刃521，可使該電磁脈衝成形時，使該側壁213 外擴並貼合該模穴51的同時，一併將形成該殼件20之已 成形基材21a的外圍廢料215切除。 如圖8所示之本發明之殼件的成形裝置第四實施例。 201200263 其中，該線圈固定座30之凸檯301内的該電磁線圈可為單 匝或多匝繞線線圈312。 請參閱圖9所示，為使該預成形基材21側壁213外擴 的磁力得到較佳的發揮，該電磁線圈外側的輪廓曲線B可 作對應的形狀調整，原則上電磁線圈31愈靠近側壁213及 拔模角52，其可對該側壁213作微特徵(micro-featured)加 工能力愈強，固可根據側壁213之幾何造形，設計電磁線 圈31剖面形狀，藉由電磁線圈31與預成形基材21之相對 位置來控制胚料與線圈之間電磁力的強弱，因此，可將該 電磁線圈外側的輪廓曲線B大抵對應於該分割式成形模具 50之該拔模角52内壁面53的輪廓曲線C，以提高施加該 處的電磁力。 值得一提的是，上述實施例中，該分割式成形模具50 之該拔模角52的内壁面53上具有一淺凹541或淺凸541 的微特徵54造型（凹入深度或凸起高度為0.5 // m〜0.5mm)，這將使該電磁脈衝成形該侧壁213倒凹角214 的同時，也會在該倒凹角214外壁面形成對應的微特徵 2141造型（凹入深度或凸起高度亦為0.5/zm〜0.5mm)，如 圖10所示。 請再參見圖1 〇所示，由上述實施例可一次成形之殼件 20包含一金屬薄板或其複合材所製成之已成形基材21a， 該已成形基材21a包括一内側211及一外側212。内側211 形成有一凹陷部2111，該凹陷部2111之下凹口具有一第一 201200263 寬度D1。外侧212對應於該凹陷部2111外圍形成有一具 倒凹角214之侧壁213。倒凹角214造成相對兩側壁213 之間的第二寬度D2大於第一寛度D1。該側壁213之外壁 面具有一淺凹或淺凸高度為約0.5 // m〜約0.5mm的微特徵 2141造型。 本發明之特點係在於：本發明利用電磁力進行殼件之 側壁成形，模具與線圈結構簡單，可成形具有倒凹角及側 壁微特徵造型的殼件。本發明具有成形快速，容易進行產 品自動化及量化生產的優點。本發明的尺寸精度高、產品 表面品質佳，且本發明可在同一模具内成形倒凹角及邊線 棱角。 綜上所述，乃僅記載本發明為呈現解決問題所採用的 技術手段之實施方式或實施例而已，並非用來限定本發明 專利實施之範圍。即凡與本發明專利申請範圍文義相符， 或依本發明專利範圍所做的均等變化與修飾，皆為本發明 專利範圍所涵蓋。 【圖式簡單說明】 圖1A繪示先前技術之電子產品； 圖1B繪示圖1之殼件的側視剖面示意圖； 圖2A至圖2D繪示本發明一實施例之殼件的成形方法的結 構流程剖面不意圖， 圖3A至圖3D繪示本發明另一實施例之殼件的成形方法的 結構流程剖面示意圖； 201200263 圖4繪示圖3A至圖2D所成形之殼件側視剖面圖； 圖5繪示本發明之殼件的成形裝置第一實施例； 圖6繪示本發明之殼件的成形裝置第二實施例； 圖7繪示本發明之殼件的成形裝置第三實施例； 圖8繪示本發明之殼件的成形裝置第四實施例； 圖9繪示本發明之殼件的成形裝置第五實施例；以及 圖10繪示圖9之裝置所成形之殼件剖面圖。 【主要元件符號說明】201200263 VI. Description of the Invention: [Technical Field] The present invention relates to a shell member having an inverted concave angle, a forming device and a forming method, and more particularly to a shell member having an inverted concave angle formed by applying an electromagnetic pulse technique. Forming device and method. [Prior Art] Referring to FIG. 1A, FIG. 1B, there is currently a shell member 11 having an inverted concave corner 12, particularly in the application of the 3C electronic product 10, since the side wall having the inverted concave corner 12 sometimes has a very shallow (about 10 mm). The recessed depth of the electronic product 10 shell member 11 is not conducive to the conventional stamping forming die design, in the demolding portion will be stuck at the portion of the inverted concave corner 12 or difficult to combine and punch out a very shallow concave mold, so the current shell member More than 11 are made of plastic and are made by injection molding or vacuum forming. However, the plastic case member 11 has a relatively flexible forming plasticity compared with the metal case member, but has a relative lack of heat dissipation, insufficient rigidity, and plastic sensitivity. SUMMARY OF THE INVENTION An object of the present invention is to provide a forming method for freely expanding or forming a shell member by electromagnetic force. The present invention further includes the above-described forming method and its finished product. In order to provide a forming method for the free bulging of the above-mentioned case member, the forming method step disclosed in the present invention comprises: providing a preformed substrate made of a metal thin plate or a composite material thereof, having a "inside" forming a depressed portion and One corresponding to 201200263 forms a "outer side" of a side wall around the periphery of the recess. The pre-formed substrate is disposed on the coil fixing base with the concave portion facing the coil fixing base, and the coil fixing base has an electromagnetic coil electrically coupled to a pulse current supply. A press block abuts the outer side of the preformed substrate, and a side wall is provided as a free bulging space. The electromagnetic coil power is turned on for electromagnetic pulse forming, and the side wall is expanded and freely bulged to form an inverted concave angle. In order to provide a molding method for forming the above-mentioned shell member, the forming method step disclosed in the present invention comprises: providing a preformed substrate made of a metal thin plate or a composite material thereof, having an inner side and an outer side, and an inner side forming a In the depressed portion, the outer side forms a side wall corresponding to the periphery of the depressed portion. The pre-formed substrate is placed between a coil fixing base and a split forming mold, and the concave portion is sleeved facing the coil fixing seat, and the coil fixing base is electrically coupled with one electromagnetic current coil of a pulse current supply, and is divided The forming die has a draft angle corresponding to a cavity at the side wall. The electromagnetic coil power is supplied to form an electromagnetic pulse, and the side walls are expanded and fitted to the cavity to form a pair of inverted concave angles which should be drafted. The invention is characterized in that: 1. In this case, the side wall of the shell member is formed by electromagnetic force, and the mold and the coil structure are simple, and the shell member having the inverted concave angle can be formed. 2. Easy product automation and quantitative production. 3. High dimensional accuracy and good surface quality of the product. [Embodiment] A preferred embodiment of the present invention will be described in detail below with reference to the drawings. In the electromagnetic pulse forming method of the present invention, when the electromagnetic coil group is turned on and the pulse current is 201200263, the billet (preformed substrate) induces an eddy current and forms a mutually exclusive electromagnetic force with the coil, and the mutual repulsive force drives the metal sheet or The preformed substrate blank made of the composite material is expanded and deformed. 2A to 2D are schematic cross-sectional views showing the structure of a method for forming a shell member according to an embodiment of the present invention. The forming method of the shell member of the present embodiment belongs to a form of free expansion, and the forming step includes: Referring to FIG. 2A, firstly, a The preformed substrate 21 is made of a high-conductivity metal sheet or a composite thereof, and can be preformed by hydraulic, casting or stamping using a new method or a conventional technique. The material of the preferred metal sheet comprises an aluminum alloy, a laminate (Ti/Al), gold, silver or copper. The composite material may be composed of a metal thin plate and a rubber film, or a metal thin plate and a plastic film. The preformed substrate 21 has an inner side 211 and an outer side 212, and the inner side 211 forms a recessed portion 2111. In the present embodiment, the recess 2111 has a positive concave corner, and the recess below the recess 2111 defines a first width D1. The outer side 212 forms a side wall 213 corresponding to the outer periphery of the recessed portion 2111. Referring to FIG. 2B, the preformed substrate 21 is placed on a coil holder 30 in such a manner that the recess portion 2111 (ie, the inner side 211) faces the coil holder 30. The coil holder 30 is supported by a reaction force during the forming process. The coil holder 30 has an electromagnetic coil 31 electrically consuming a pulse current supply 32. As shown in FIG. 2C, the preformed substrate 21 is fastened to the coil holder 30 by a pressing block 40 against the pre-formed substrate 21 201200263, the outer side 212, and the inner surface of the left block 40 and the preform base. The side wall 213 - free bulging space A is reserved between the materials 21. Referring to FIG. 2D, the electromagnetic current of the electromagnetic coil 31 is provided by the pulse current supply 32 to perform electromagnetic pulse forming (Eiectromagnetic forming 'Magnetic pulse forming'. The sidewall 213 is freely expanded and expanded into a formed substrate. 21a, the sidewall 213 of the formed substrate 21a has an inverted concave angle 214 which causes a second width D2 between the opposite side walls 213 of the formed substrate 21a (the second twist D2 is perpendicular to the The pressing direction P or the exiting direction of the pressing block 40 is larger than the first width D1. 3A to 3D are schematic cross-sectional views showing the structure of a method for forming a shell member according to another embodiment of the present invention. The forming method of the shell member of the present embodiment belongs to a molding method of forming a mold. The forming step includes: Referring to FIG. 3A', a pre-formed substrate 21 is provided, which is made of a metal thin plate or a composite material thereof. The 211 has an inner side 211 and an outer side 212, and the inner side 211 forms a recess 2111. In the present embodiment, the recess 2111 has a positive concave corner, and the recess below the recess 2111 defines a first width D1. The outer side 212 corresponds to the outer periphery of the recessed portion 2111 to form a side wall 213. Referring to FIG. 3B and FIG. 3C, the preformed substrate 21 faces the coil holder 3〇 with the recessed portion 2111 and is sleeved on the coil holder 3' and the preformed substrate 21 is located. The split molding die 50 is positioned under a split molding die 50, 201200263, such that the preformed substrate 21 is positioned between the coil mount 30 and the split mold 50, the coil mount 30 has An electromagnetic coil 31 is electrically coupled to a pulse current supply 32. The split molding die 50 has a draft angle 52 corresponding to a cavity 51 at the sidewall 213. The draft angle 52 is 52 It is a negative angle. Referring to FIG. 3D, the electromagnetic current of the electromagnetic coil 31 is provided by the pulse current supply 32 for electromagnetic pulse forming, and the sidewall 213 is expanded and attached to the cavity 51 to form a formed substrate 21a. The substrate 21a has an inverted concave angle 214 corresponding to the draft angle 52, and the inverted concave angle 214 causes a second width D2 between the opposite side walls 213 of the formed substrate 21a (the second width D2 is perpendicular to the split forming mold) The draft direction of 50 is greater than the first width D1. As shown in FIG. 4, after the mold is demolded and the formed substrate 21a is taken out from the coil holder 30, the peripheral waste 215 is removed (the peripheral waste 215 can be molded by using an additional mold. The design is performed by collectively removing electromagnetic pulse forming, as will be described later, to form a shell member 20 having an inverted concave angle. Further, in the foregoing embodiment, the coil holder 30 is made of an insulating material, preferably an engineering plastic or a glass fiber resin. A first embodiment of a forming apparatus for a casing member of the present invention as shown in FIG. The forming device of the shell member of the electronic product of the present embodiment is suitable for shaping a metal sheet of a preformed substrate 21 or a composite thereof into a shell member having an inverted concave angle of 201200263, the preformed substrate 21 having An inner side 211 and an outer side 212, the inner side 211 defines a recessed portion 2111. The outer side 212 defines a side wall 213 corresponding to the outer periphery of the recessed portion 2111. The forming device of the embodiment comprises: a coil fixing base having a boss 301 30. An electromagnetic coil 31 is disposed on the outer side of the boss 301. The electromagnetic coil 31 is electrically coupled to a pulse current supply 32, and a pressing block 40 is disposed on the coil fixing base 30. The forming substrate 21 is sleeved on the boss 301 so that the inner side 211 corresponds to the coil fixing base 30. The pressing block 40 abuts the outer side 211 of the preformed substrate 21, and the outer side 211 A free bulging space is reserved on the inner surface of the pressing block 40 for forming the side wall 213. A second embodiment of a forming apparatus for a casing member of the present invention as shown in Fig. 6. The present embodiment is similar to the conditions of the coil holder 30, the boss 301, and the electromagnetic coil 31 of the first embodiment, and the split block 40 is replaced by a split mold 50, which is used for abutting. The outer surface 212 of the pre-formed substrate 21, a cavity 51 corresponding to the sidewall 213 of the split molding die 50 has a draft angle 52 for forming and fitting the preformed substrate 21, the draft angle 52 is a negative angle. As shown in Fig. 7, a third embodiment of the forming apparatus for the case member of the present invention is shown. The outer edge of the inner wall surface 53 of the draft angle 52 of the split molding die 50 further has a cutting edge 521, so that when the electromagnetic pulse is formed, the side wall 213 is expanded and attached to the cavity 51, and The peripheral waste 215 of the formed substrate 21a forming the shell member 20 is cut away. A fourth embodiment of a forming apparatus for a casing member of the present invention as shown in FIG. 201200263 The electromagnetic coil in the boss 301 of the coil holder 30 may be a single or multiple turns coil 312. Referring to FIG. 9 , in order to better exert the magnetic force of the sidewall 213 of the preformed substrate 21 , the contour curve B on the outer side of the electromagnetic coil can be adjusted correspondingly. In principle, the electromagnetic coil 31 is closer to the sidewall. 213 and the draft angle 52, the micro-featured processing capability of the sidewall 213 is stronger, and the cross-sectional shape of the electromagnetic coil 31 is designed according to the geometric shape of the sidewall 213, and the electromagnetic coil 31 and the preform are formed. The relative position of the substrate 21 controls the strength of the electromagnetic force between the blank and the coil. Therefore, the contour curve B outside the electromagnetic coil can be largely corresponding to the inner wall surface 53 of the draft angle 52 of the split molding die 50. Contour curve C to increase the electromagnetic force applied there. It is to be noted that, in the above embodiment, the inner wall surface 53 of the draft angle 52 of the split molding die 50 has a micro-feature 54 shape (recessed depth or raised height) of a shallow concave 541 or a shallow convex 541. 0.5/5 m~0.5 mm), which will cause the electromagnetic pulse to form the recessed angle 214 of the side wall 213, and also form a corresponding microfeature 2141 shape on the outer wall surface of the inverted concave angle 214 (recessed depth or protrusion) The height is also 0.5/zm~0.5mm), as shown in Figure 10. Referring to FIG. 1 again, the case member 20 which can be formed at one time by the above embodiment comprises a formed substrate 21a made of a metal thin plate or a composite material thereof. The formed substrate 21a includes an inner side 211 and a Outside 212. The inner side 211 is formed with a recess 2111, and the recess below the recess 2111 has a first 201200263 width D1. The outer side 212 defines a side wall 213 having an inverted concave angle 214 corresponding to the periphery of the recessed portion 2111. The undercut 214 causes the second width D2 between the opposite side walls 213 to be greater than the first twist D1. The outer wall of the side wall 213 has a microfeature 2141 shape having a dimple or shallow convex height of about 0.5 // m to about 0.5 mm. The invention is characterized in that the invention utilizes electromagnetic force to form the side wall of the shell member, and the mold and the coil structure are simple, and the shell member having the inverted concave angle and the side wall micro-feature shape can be formed. The invention has the advantages of rapid forming, easy product automation and quantitative production. The present invention has high dimensional accuracy and good surface quality, and the present invention can form undercut angles and edge edges in the same mold. In the above, it is merely described that the present invention is an embodiment or an embodiment of the technical means for solving the problem, and is not intended to limit the scope of the practice of the present invention. That is, the equivalent changes and modifications made in accordance with the scope of the patent application of the present invention or the scope of the invention are covered by the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a front cross-sectional view of the casing of FIG. 1; FIG. 2A to FIG. 2D are diagrams showing a method of forming a casing according to an embodiment of the present invention. 3A to 3D are schematic cross-sectional views showing the structure of a method for forming a shell member according to another embodiment of the present invention; 201200263 FIG. 4 is a side cross-sectional view showing the shell member formed by FIGS. 3A to 2D. Figure 5 is a first embodiment of a forming device for a shell member of the present invention; Figure 6 is a second embodiment of a forming device for a shell member of the present invention; Figure 7 is a third embodiment of a forming device for a shell member of the present invention; 8 is a fourth embodiment of a forming device for a shell member of the present invention; FIG. 9 is a fifth embodiment of a forming device for a shell member of the present invention; and FIG. 10 is a view showing a shell member formed by the device of FIG. Sectional view. [Main component symbol description]
[先前技術部分] 10 電子產品 11 塑膠殼件 12 倒凹角 [本發明部分] 20 殼件 21 預成形基材 21a 已成形基材 211 内側 2111 凹陷部 212 外側 213 側壁 214 倒凹角 2141 微特徵 215 外圍廢料 30 線圈固定座 [s] 11 201200263 301 凸檯 31 電磁線圈 312 多匝繞線線圈 32 脈衝電流供應器 40 壓塊 50 分割式成形模具 51 模穴 52 拔模角 521 切刃 53 内壁面 54 微特徵 541 淺凹 542 淺凸 A 自由脹形空間 B 電磁線圈外側的輪廣曲線 C 倒凹角壁面的輪廓曲線 D1 第一寬度 D2 第二寬度 P 加壓方向 m 12[Prior Art] 10 Electronics 11 Plastic Case 12 Indentation Angle [Part of the Invention] 20 Shell 21 Preformed Substrate 21a Formed Substrate 211 Inner 2111 Recessed 212 Outside 213 Sidewall 214 Indented Corner 2141 Microfeature 215 Peripheral Waste 30 Coil holder [s] 11 201200263 301 Boss 31 Electromagnetic coil 312 Multi-twist winding 32 Pulse current supply 40 Clamp 50 Split forming die 51 Mold 52 Draft angle 521 Cutting edge 53 Inner wall 54 Micro Feature 541 Shallow concave 542 Shallow convex A Free bulging space B Curve of the outer side of the electromagnetic coil C Contour curve of the inverted concave wall D1 First width D2 Second width P Pressurization direction m 12