JPH0352722A - Lead frame coining method - Google Patents

Lead frame coining method

Info

Publication number
JPH0352722A
JPH0352722A JP1190736A JP19073689A JPH0352722A JP H0352722 A JPH0352722 A JP H0352722A JP 1190736 A JP1190736 A JP 1190736A JP 19073689 A JP19073689 A JP 19073689A JP H0352722 A JPH0352722 A JP H0352722A
Authority
JP
Japan
Prior art keywords
coining
punch
head
lead frame
inner lead
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP1190736A
Other languages
Japanese (ja)
Inventor
Shinichi Shozui
勝瑞 真一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Metal Mining Co Ltd
Original Assignee
Sumitomo Metal Mining Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Metal Mining Co Ltd filed Critical Sumitomo Metal Mining Co Ltd
Priority to JP1190736A priority Critical patent/JPH0352722A/en
Publication of JPH0352722A publication Critical patent/JPH0352722A/en
Pending legal-status Critical Current

Links

Landscapes

  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Lead Frames For Integrated Circuits (AREA)

Abstract

PURPOSE:To prevent the spring-up at a top end part of the inner lead by using a coining punch with its head surface inclined and coining while its long side of the above punch head is directed toward the top end part of the lead frame. CONSTITUTION:A square punch head 4 is set in projecting state at one surface of the coining punch 3 and its surface of the punch head 4 is made inclined surface 5. The incline angle theta of this surface 5 against the horizontal surface is varied respectively with the material quality of lead frame, the inner lead width and the coining depth, etc., but may be decided to the angle equal to the angle of the spring-up against the horizontal surface generated by using the usual flat head coining punch. When coining is executed by using this type punch 3, work may be executed as usual by setting the punch with the long side 6 of the punch head 4 toward the top end side of the inner lead 2. Therefore, the lead frame having the inner lead 2 which is worked with coining with dimensional accuracy in plate thickness direction and without the spring-out is obtained.

Description

【発明の詳細な説明】 (産業上の利用分野〉 本発明は、半導体装置に使用されるリードフレームのイ
ンナーリード先端部をコイニングする際のインナーリー
ド先端部のハネ上りを防止することができ、板厚方向の
寸法精度を高くし得るリードフレームのコイニング方法
に関するものである。
Detailed Description of the Invention (Industrial Application Field) The present invention can prevent the inner lead tip from springing up when coining the inner lead tip of a lead frame used in a semiconductor device. The present invention relates to a lead frame coining method that can improve dimensional accuracy in the thickness direction.

(従来の技術) 従来から第■図に示すようなリードフレーム1をプレス
加工によって製造するには、打抜き素材を順送り金型に
間欠的に供給し、順次打抜いて所定形状に加工する。そ
して、最終工程の間近の工程で、インナーリード2先端
部を、その先端の断面形状をワイヤーボンディングし易
いように平坦部を拡張する目的で平頭コイニングパンチ
で押し潰す加工いわゆるコイニングをしてワイヤーボン
ディング町能な寸法の平坦部を確保した後、素材から切
断して仕上げるという方法がとられている。
(Prior Art) Conventionally, in order to manufacture a lead frame 1 as shown in FIG. 3 by press working, a punching material is intermittently supplied to a progressive die, and is sequentially punched out into a predetermined shape. Then, in a step near the final process, the tip of the inner lead 2 is crushed with a flat head coining punch in order to expand the flat part so that the cross-sectional shape of the tip can be easily wire bonded. The method used is to secure a flat section of suitable dimensions, then cut it from the material and finish it.

しかして、このコイニングの際、インナーリード先端部
を押し潰すために、平頭コイニングパンチの平頭の角部
に、応力集中が作用し、その角部によって押し潰ぶされ
た箇所を支点としてインナーリード先端部が押された方
向と反対方向にハネ上ることが生じるのは避けられない
現象である(第5図参照〉。ワイヤーボンディング加工
が、インナーリードにヒーターブロックから熱を加えて
行なわれるために、インナーリード先端部がハネ上って
いると、ヒーターブロックへのインナーリードの接触面
積が少なくなり、熱伝導が低下し、ワイヤーボンデイン
グ加工が不可能になるという事態に陥いるものである。
During coining, in order to crush the tip of the inner lead, stress concentration acts on the corner of the flat head of the flat head coining punch, and the tip of the inner lead uses the crushed part by the corner as a fulcrum. It is an unavoidable phenomenon that the part springs up in the opposite direction to the direction in which it is pressed (see Figure 5).Since the wire bonding process is performed by applying heat from the heater block to the inner lead, If the tips of the inner leads spring up, the contact area of the inner leads with the heater block decreases, heat conduction decreases, and wire bonding becomes impossible.

このインナーリード先端部のハネ上りを防ぐために、従
来、千頭コイニングパンチの頭部角部に切欠き部を設け
ておいて、コイニングしたときに、第4図に示すように
、いわゆるC面が残るようにしてハネ上りを防ぐとか、
あるいは、コイニングを2工程に分け、初めには所要面
積より広く軽打した後に、所要面積を再度プレスする方
法、又は、コイニングを施すライン上に溝をあらかじめ
設けておいてコイニング中の平頭角部の応力集中を緩和
する方法などがとられている。
In order to prevent the tip of the inner lead from springing up, conventionally, a notch is provided in the head corner of the Senzu coining punch, so that when coining, the so-called C surface is formed as shown in Fig. 4. To prevent splashing by leaving it behind,
Alternatively, the coining process is divided into two steps, and the first step is to tap the area wider than the required area, and then press the required area again. Alternatively, a groove can be created in advance on the coining line and the flat head corner during coining can be made. Measures are being taken to alleviate stress concentration.

(発明が解決しようとする課題〉 しかしながら、前述のようなハネ上り防止方法は、作業
時に生じるダイス1−ロークの変動の中で、コイニング
の深さが深くなり、歪が大きくなると効果が少なくなっ
たり、手数が余分にかかるなど実用上不満足なものであ
る。
(Problems to be Solved by the Invention) However, the above-mentioned method for preventing splashing becomes less effective as the depth of coining becomes deeper and the distortion becomes larger due to fluctuations in the die 1-loak ratio that occur during work. This method is unsatisfactory from a practical point of view, as it requires additional time and effort.

本発明は、前記問題を解決し、リードフレームのインナ
ーリード先端部のコイニングに際して、八ネ上りを防止
し得る手段を得ることを目的とするものである。
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a means for preventing the coining of the tip of the inner lead of a lead frame.

(課題を解決するための手段) 本発明者は、前記問題を解決し、前記目的を達或するた
めに研究の結果、コイニングパンチの頭面をインナーリ
ード先端部のハネ上り角度に相当する角度の傾斜面とす
ることによって目的を達し得ることを見出して本発明を
完或するに至った。
(Means for Solving the Problems) In order to solve the above problems and achieve the above objects, the inventors of the present invention, as a result of research, have determined that the head of the coining punch is set at an angle corresponding to the spring angle of the tip of the inner lead. The present invention has been completed by discovering that the object can be achieved by using an inclined surface.

すなわち、本発明は、リードフレームのインナーリード
先端部にコイニングパンチによってコイニングする方法
において、コイニングバンチ頭面を傾斜面としたコイニ
ングパンチを使用してコイニングパンチのパンチ頭の長
辺側をリードフレーム先端側に向けてコイニングするリ
ードフレームのコイニング方法である。
That is, the present invention provides a method of coining the tip of an inner lead of a lead frame with a coining punch, in which a coining punch whose coining bunch head is an inclined surface is used, and the long side of the punch head of the coining punch is attached to the tip of the lead frame. This is a lead frame coining method that coins toward the side.

次に、添付図面に基づいて本発明を説明する。Next, the present invention will be explained based on the accompanying drawings.

第1図は、リードフレームの一実施例を示す平面図、第
2図は、本発明に使用するコイニングパンチの一実施例
を示す側面図、第3図は、本発明方法によってコイニン
グして得たインナーリード先端部の一実施例を示す斜視
図である。
FIG. 1 is a plan view showing an embodiment of the lead frame, FIG. 2 is a side view showing an embodiment of the coining punch used in the present invention, and FIG. 3 is a plan view showing an embodiment of the coining punch used in the present invention. FIG. 3 is a perspective view showing an example of the tip end portion of the inner lead.

lは、リードフレームであって、プレス法で所定形状の
インナーリード2が設けられている。3は、コイニング
パンチであって、その1面に、角形のバンチ頭4が突設
され、パンチ頭4面は、傾斜面5とされている。しかし
て、この傾斜面5の水平面となす傾斜角θは、リードフ
レームの材質やインナーリード幅、コイニング深さなど
によっでも異なるが、パンチ頭4の長辺6と水平面とな
す角度が、通常の千頭コイニングパンチを使用して生じ
るハネ上りの水平面となす角度に相当する程度の角度に
とればよく、通常、2〜3゜程度にとればよい。
Reference numeral 1 denotes a lead frame, on which inner leads 2 of a predetermined shape are provided by a pressing method. 3 is a coining punch, on one side of which a square bunch head 4 is protruded, and the punch head 4 has an inclined surface 5. Although the inclination angle θ between the inclined surface 5 and the horizontal plane varies depending on the material of the lead frame, the inner lead width, the coining depth, etc., the angle between the long side 6 of the punch head 4 and the horizontal plane is usually The angle may be approximately equivalent to the angle formed with the horizontal plane of the bounce generated using the Senzu Coining Punch, and is usually approximately 2 to 3 degrees.

このようなコイニングパンチを使用してコイニングする
には、パンチ頭4の長辺6側をリードフレーム1のイン
ナーリード2の先端側にあるように向けて設定して通常
のようにコイニング作業を行なえばよく、このようにし
て第3図に示すように、ハネ−Eりのない、板厚方向の
寸法精度のよいコイニングを施したインナーリ一ドをも
つリード5 フレームを得ることができるものである。
To coin using such a coining punch, set the long side 6 of the punch head 4 toward the tip of the inner lead 2 of the lead frame 1, and perform coining as usual. In this way, as shown in Fig. 3, it is possible to obtain a lead 5 frame with an inner lead that is coined and has good dimensional accuracy in the plate thickness direction without any fly-E. .

(実施例〉 以下、本発明の実施例を述べる。(Example> Examples of the present invention will be described below.

実施例 1 厚さ0.25mmの42合金素材を使用して、第l図に
示すように、先端部の幅が0.28mmのインナーリー
ド2を40本有するリードフレーム■を打抜いて製造し
、第2図に示すような傾斜角θが2°30゛の角度で傾
斜面5を設けたコイニングバンチ3を使用して、コイニ
ングパンチ3のパンチ頭4の長辺6がインナーリード2
の先端部方向に向くようにして設置してコイニングを行
なった。
Example 1 Using 42 alloy material with a thickness of 0.25 mm, a lead frame (2) having 40 inner leads 2 each having a width of 0.28 mm at the tip as shown in Fig. 1 was manufactured by punching. , using a coining bunch 3 having an inclined surface 5 with an inclination angle θ of 2°30° as shown in FIG.
Coining was performed by placing the coins facing toward the tip of the coin.

この結果、第4図に示すような所定寸法で、打抜き素材
表面とほぼ平行なコイニングされた面を得ることができ
た。
As a result, a coined surface with predetermined dimensions and substantially parallel to the surface of the punched material as shown in FIG. 4 could be obtained.

実施例 2 コイニングバンチ3のパンチ頭4の傾斜角θを2゜とし
たコイニングパンチ3を使用した以外は、実施例゛1と
同様にしてコイニングを行なった。
Example 2 Coining was carried out in the same manner as in Example 1, except that a coining punch 3 in which the punch head 4 of the coining bunch 3 had an inclination angle θ of 2° was used.

この結果も、所定の寸法で、打抜き素材表面と6 ほぼ平行なコイニングされた面を得ることができた。This result also shows that, with the predetermined dimensions, the surface of the punched material and the Almost parallel coined surfaces could be obtained.

比較例 コイニングパンチ3のパンチ頭4が水平面である従来の
千頭コイニングパンチを使用してコイニングを行なった
Comparative Example Coining was carried out using a conventional 1,000-head coining punch in which the punch head 4 of the coining punch 3 was a horizontal surface.

この結果は、第5図に示すように、打抜き素材表面に対
して、2゜30’の角度をもったハネ上ったコイニング
された面となった。
The result was a coined surface that was raised at an angle of 2°30' with respect to the surface of the punched material, as shown in FIG.

(発明の効果〉 本発明は、コイニングパンチのパンチ頭面をインナーリ
ードのハネ上り角度に相当する角度の傾斜面としたコイ
ニングパンチを使用してコイニングするものであるから
、インナーリードのハネ上りを防止し得て打抜き素材表
面とほぼ平行なコイニングされた面となし得、イナンー
リード先端部のコイニングされた部分の板厚方向の寸法
精度を高くし得、ワイヤーボンディング性と歩留りを向
上し得るなど顕著な効果が認められる。
(Effects of the Invention) The present invention is for coining using a coining punch in which the punch head surface of the coining punch is an inclined surface at an angle corresponding to the spring-up angle of the inner lead. The coined surface can be made almost parallel to the surface of the punched material, the dimensional accuracy in the plate thickness direction of the coined part at the tip of the iner lead can be increased, and wire bonding performance and yield can be improved. A significant effect was observed.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は、リードフレームの一実施例を示す平面図、第
2図は、本発明に使用するコイニングパンチの一実施例
を示す側面図、第3図は、本発明方法によってコイニン
グして得たインナーリード先端部の一実施例を示す斜視
図、第4図は、従来のハネ上り防止例を示す切欠斜視図
、第5図は、従来法によるインナーリード先端部のハネ
上り例を示す斜視図である。 1・・・リードフレーム、2・・・インナーリード、3
・・・コイニングパンチ、4・・・パンチ頭、5・・・
傾斜面、6・・・長辺、θ・・・傾斜角
FIG. 1 is a plan view showing an embodiment of the lead frame, FIG. 2 is a side view showing an embodiment of the coining punch used in the present invention, and FIG. 3 is a plan view showing an embodiment of the coining punch used in the present invention. FIG. 4 is a cutaway perspective view showing an example of conventional spatter prevention, and FIG. 5 is a perspective view showing an example of spatter at the inner lead tip according to the conventional method. It is a diagram. 1... Lead frame, 2... Inner lead, 3
... Coining punch, 4... Punch head, 5...
Inclined surface, 6...Long side, θ...Inclination angle

Claims (1)

【特許請求の範囲】[Claims] (1)リードフレームのインナーリード先端部をコイニ
ングパンチによってコイニングする方法において、コイ
ニングパンチ頭面を傾斜面としたコイニングパンチを使
用してコイニングパンチのパンチ頭の長辺側をリードフ
レーム先端側に向けてコイニングすることを特徴とする
リードフレームのコイニング方法。
(1) In the method of coining the tip of the inner lead of a lead frame with a coining punch, use a coining punch whose coining punch head is inclined, and direct the long side of the punch head of the coining punch toward the tip of the lead frame. A lead frame coining method characterized by coining a lead frame.
JP1190736A 1989-07-20 1989-07-20 Lead frame coining method Pending JPH0352722A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1190736A JPH0352722A (en) 1989-07-20 1989-07-20 Lead frame coining method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1190736A JPH0352722A (en) 1989-07-20 1989-07-20 Lead frame coining method

Publications (1)

Publication Number Publication Date
JPH0352722A true JPH0352722A (en) 1991-03-06

Family

ID=16262921

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1190736A Pending JPH0352722A (en) 1989-07-20 1989-07-20 Lead frame coining method

Country Status (1)

Country Link
JP (1) JPH0352722A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106971996A (en) * 2015-12-21 2017-07-21 瑞萨电子株式会社 Semiconductor devices

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106971996A (en) * 2015-12-21 2017-07-21 瑞萨电子株式会社 Semiconductor devices

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