1、毕 业 设 计（论 文）外 文 参 考 资 料 及 译 文译文题目： Punch press with automatic tool changer 具有自动换刀装置的冲压机学生姓名： 学 号： 专 业： 所在学院： 指导教师： 职 称： 20xx年 2月 27日Punch press with automatic tool changerAbstract: The punch, stripper and die holders of a punch press are moved bodily toward an indexable turret and automatically pick
2、 up a punch, a stripper and a die from the turret preparatory to being shifted bodily away from the turret to perform a punching operation. When the punching operation is completed, the holders return the tools to the turret, the turret is indexed and then the holders pick up a different set of tool
3、s from the turret. Means are provided for shielding vulnerable areas of the holders from debris created during the operation of a plasma-arc torch which is associated with the press. The tools on the turret also are shielded from the debris. Claims:1. A punch press comprising a support, a vertically
4、 reciprocable ram, a tool holder on the lower end of said ram and having an opening for receiving a punch, a die holder spaced below said tool holder and having means for supporting a die, said die holder having a slug opening extending therethrough, a tool magazine on said support and releasably ho
5、lding a plurality of tool sets each comprising a punch and a vertically alined die adapted to coact with one another to form a hole in a workpiece, said magazine also releasably holding a dummy set comprising a first shield adapted to cover the opening in said tool holder and further comprising a se
6、cond shield adapted to cover said die holder and close off said slug opening, means for moving said magazine on said support to advance any selected one of said sets to a tool changing station, means selectively operable to cause the set in said tool changing station to be transferred from said maga
7、zine to said tool and die holders and then subsequently back to said magazine, a housing fixed to said support and enclosing said magazine, an access opening in said housing at said tool changing station and exposing the set at said tool changing station, and shield means carried by and movable with
8、 said magazine, said shield means being located adjacent the home of said dummy set and being operable, when said home is in said tool changing station, to close off said access opening and protect said tool sets of said magazine from foreign material entering into said housing through said access o
9、pening. 2. A punch press as defined in claim 1 further including means for moving said tool and die holders bodily on said support and toward and away from said magazine. 3. A punch press comprising a support, a vertically reciprocable ram, a tool holder on the lower end of said ram and having a dow
10、nwardly and laterally facing opening for receiving a punch, said opening having a lower side and a lateral side, a die holder spaced below said tool holder and having means for supporting a die, said die holder having a slug opening extending therethrough, a first dummy tool for covering the lower s
11、ide of the opening in said tool holder and having an upright shield for covering the lateral side of the opening in said tool holder, and a second dummy tool having a shield for covering said die holder and closing off said slug opening. 4. A punch press as defined in claim 3 further including means
12、 for holding said first and second dummy tools in superimposed relationship at a location outside of said holders. Description:BACKGROUND OF THE INVENTIONThis invention relates to a punch press of the type in which a vertically reciprocable punch coacts with an underlying die to form a hole in an in
13、tervening workpiece. A stripper usually encircles the punch and holds the workpiece downwardly against the die when the punch is retracted in order to prevent the workpiece from being lifted upwardly by the punch. The invention more particularly relates to a punch press of the tool changing type in
14、which the punch, the stripper and the die are adapted to be removed automatically from their respective holders and replaced with another set of tools of a different size or shape. Tool changing presses have been marketed previously by Trumpf & Co. and include a magazine which holds several sets of
15、vertically alined punches, strippers and dies. The magazine is indexed to bring a given set of tools to a tool changing station and then the tools are transferred from the magazine to the various holders. When the punching operation has been completed, the tools are transferred from the holders to the magazine preparatory to the magazine being indexed to bring a different set of tools to the tool changing station. The press of the present invention preferably is equipped with a metal melting tool such as a plasma-arc torch of the type disclosed in Brolund et
