JPH0357423U

JPH0357423U -

Info

Publication number: JPH0357423U
Application number: JP11791489U
Authority: JP
Priority date: 1989-10-06
Filing date: 1989-10-06
Publication date: 1991-06-03

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例のダイとブランクホ
ルダとで平らな板材を挟んだ状態を示す縦断面図
、第２図は同実施例にポンチがダイの製品形成用
凹部に押し込まれた初期状態を示す要部の縦断面
図、第３図は同実施例のポンチがダイの製品形成
用凹部に押し込まれた後期で成形部分の湾曲部が
スプリングバツク矯正機構により曲げ戻された状
態を示す要部の縦断面図、第４図は同実施例のポ
ンチがダイの製品形成用凹部に押し込まれた後期
でダイが下死点に位置した状態を示す要部の縦断
面図、第５図は従来のプレス機械のダイとブラン
クホルダとで平らな板材を挟んだ状態を示す縦断
面図、第６図は同従来のダイが下死点に位置した
状態を示す要部の縦断面図、第７図は従来のプレ
ス機械でプレス加工したチヤンネル形の成形部分
の要部を示す斜視図、第８図は板材の板厚に対す
る曲率半径の割合とスプリングバツク量との関係
を示す特性図、第９図は従来のスプリングバツク
量矯正装置の縦断面図である。１……ダイ、２……ブランクホルダ、３……ポ
ンチ、５……製品形成用凹部、２２……サブポン
チ、２３……弾性体、Ｗ……板材、Ｗａ……成形
部分、Ｗａ_３（Ｗａ_３−１）……頂壁（湾曲部）
。 Fig. 1 is a longitudinal sectional view showing a state in which a flat plate material is sandwiched between a die and a blank holder according to an embodiment of the present invention, and Fig. 2 is a longitudinal sectional view showing a state in which a flat plate material is sandwiched between a die and a blank holder according to an embodiment of the present invention. FIG. 3 is a vertical sectional view of the main part showing the initial state, and shows the state in which the curved part of the forming part is bent back by the springback correction mechanism at the later stage when the punch of the same embodiment is pushed into the product forming recess of the die. FIG. 4 is a vertical cross-sectional view of the main part shown in FIG. 4, and FIG. The figure is a longitudinal cross-sectional view showing a state in which a flat plate is sandwiched between the die and blank holder of a conventional press machine, and Figure 6 is a longitudinal cross-sectional view of the main part of the conventional press machine, showing a state in which the die is located at the bottom dead center. , Fig. 7 is a perspective view showing the main parts of a channel-shaped molded part pressed with a conventional press machine, and Fig. 8 is a characteristic diagram showing the relationship between the ratio of the radius of curvature to the thickness of the plate material and the amount of spring back. 9 is a longitudinal cross-sectional view of a conventional spring back correction device. DESCRIPTION OF SYMBOLS 1...Die, 2...Blank holder, 3...Punch, 5...Recess for product formation, 22...Sub punch, 23...Elastic body, W...Plate material, Wa...Forming part, Wa ₃ (Wa _3-1 )...Top wall (curved part)
.

Claims

[Scope of utility model registration request]

In a press machine that sandwiches a plate material between a die and a blank holder and presses a punch into a product forming recess of the die to form a channel-shaped molded part on the plate material, an elastic material is attached to the bottom wall of the product forming recess of the die. A sub-punch is provided that is supported in a retractable manner and whose end protrudes from the bottom wall of the recess, and the top wall of the plate forming part lifts up from the punch while the punch is being pushed into the product forming recess, thereby punching the curved part. A press device characterized by being bent back to the side.