Tool changing – Process
Patent
1993-05-13
1994-03-29
Briggs, William
Tool changing
Process
83 39, 83 55, 36447421, B23Q 3155, G05B 1918, B21D 3100
Patent
active
052980065
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Background Art
In a general punch press machining, a plurality of punching tools are alternately used to expand the machining conditions of a punch press machine. Further, a plurality of products having the same punching configuration are made from a single piece of a raw material sheet at the same time to increase the machining efficiency of the punch press machine. In particular, when the size of a product is small relative to the size of a raw material sheet, the number of products punched from a single piece of the raw material sheet is increased to effectively use the sheet. Therefore, in a process for punching respective products, a time necessary to move a punching tool to punching positions is increased and thus a time necessary to finish the punching process is also increased.
Conventionally, the movement of a workpiece table is controlled by a numerical control apparatus to reduce the moving time thereof. More specifically, a machining program is created to machine a single piece of a raw material sheet and stored in the memory of the numerical control apparatus. When the numerical control machine commands a punch press machine to punch a plurality of products, the punch press machine accesses the machining program stored in the memory commanded times. At this time, machining positions on a piece of the raw material sheet are located in a grid-shape to effectively punch a multiplicity of products.
The machining program commands a machining sequence and the like to a tool. Then, a machining command for driving a punching head in accordance with a commanded machining sequence is applied to the punch press machine. With this arrangement, a workpiece table on which the raw material sheet is fixed is sequentially moved so that a predetermined punch press machining is executed to the raw material sheet.
This machining program executes a punch press machining by two kinds of methods: in one of the methods, a punch press machining is executed while changing a tool for each product and this tool change is repeated for the predetermined number of products; and in the other of the methods, a multiplicity of products are machined by a single tool, and in this method, a punch press machining is executed predetermined times while changing a tool.
In general, the number of tool changes of the latter method is less than that of the former method and thus a time necessary to change all the tools and an entire machining time in the later method are shorter than those in the former method. Therefore, a punch press machine employs the latter machining method.
Nevertheless, a conventional machining method of the punch press machine executed by a machining program starts a machining operation from a fixed position. As a result, when a tool is to be changed, a time is needed to move a workpiece table from a position where previous machining is finished to a position from which a next machining is started, and thus a problem arises in that a time for waiting the start of the next machining is wasteful.
DISCLOSURE OF THE INVENTION
Taking the above into consideration, an object of the present invention is to provide a machining method of a punch press machine by which a moving time of a workpiece table is excluded to improve an operation efficiency.
To attain the above object, according to the present invention, there is provided a machining method of a punch press machine for making a plurality of products from a single piece of a raw material sheet, comprising the steps of fixing a tool and punching the raw material sheet at grid positions in a particular sequence, executing a tool change when a machining by the tool has been finished, and executing a machining in a sequence opposite to the sequence.
A machining program for machining a single piece of a raw material sheet is stored in the memory of a numerical control machine. When a punch press machine is commanded to punch a multiplicity of products, the raw material sheet is punched at grid positions by a punching tool in accordance with a particul
REFERENCES:
patent: 3448645 (1969-06-01), Graf et al.
patent: 4667294 (1987-05-01), Shima et al.
patent: 4823255 (1989-04-01), Tanaka et al.
patent: 4965737 (1990-10-01), Iwagaya
patent: 5041985 (1991-08-01), Fujita
patent: 5150303 (1992-09-01), Fukaya et al.
Briggs William
Fanuc Ltd.
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