Cutting – Tool or tool with support – Cutting couple type
Patent
1997-03-06
2000-01-04
Rachuba, M.
Cutting
Tool or tool with support
Cutting couple type
83420, 83452, 83684, 269 63, 269287, B26F 114, B26D 702
Patent
active
060097876
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a process for punching holes in flat workpieces and a device for carrying out this process. In particular, the present invention relates to a process for manufacturing orifice disks in series for multihole fuel-injection nozzles, comprising punching holes successively with a single punch by stepwise angular adjustment of a sheet-metal workpiece.
2. Discussion of Background
Injection valves with orifice disks having perpendicular or oblique holes are increasingly used in car engines and require uniform distribution of the fuel injected into each cylinder of the engine. The series production of such orifice disks requires the punching of identical symmetrically arranged holes and is problematic inasmuch as slight deviations resulting from punching; can impair the uniform distribution of fuel.
The series production of orifice disks for multihole nozzles for use in fuel-injection engines is therefore particularly problematic inasmuch as an extremely high reproducibility of the precision of the quality and the position of each of the holes punched with narrow spacing has to be guaranteed in order to ensure the efficient operation of fuel-injection engines produced in large series.
SUMMARY OF THE INVENTION
The object of the invention is essentially to enable the punching of identical holes with relatively simple technical means in such a manner that the series production of such orifice plates with various symmetrical hole arrangements can be ensured with high precision and reproducibility to ensure the efficient operation of fuel-injection engines.
Accord to the invention all the holes are punched with a single punch, while the workpiece is positioned successively in predetermined angular positions and thereby respectively defines the position of each hole to be punched in the workpiece.
The workpiece is advantageously designed in the form of a polygon which defines the different angular positions for positioning the workpiece with the aid of corresponding lateral stops.
The outer form or contour of the polygonally shaped workpiece performs the function of a template which interacts with the lateral stops in a particularly simple manner so as to position the workpiece in predetermined angular positions according to the invention and to thereby define the position of each hole punched in the workpiece.
The lateral stops are respectively arranged on a fixed die and adapted to the polygonal workpiece so that they enable the selective arrangement of the workpiece in different predetermined angular positions for successively punching holes in corresponding predetermined locations in the workpiece.
Holes extending obliquely to the workpiece surface can moreover be punched by positioning the workpiece on a bearing surface of a die which is inclined accordingly.
Pairs of holes extending parallel to each other can moreover be punched by providing a workpiece with two opposite sides having recesses of different depths, while the lateral stops are caused to act selectively on these recesses in corresponding angular positions of the workpiece.
Such pairs of holes extending parallel to each other may be punched obliquely to the workpiece surface in a simple manner by lateral displacement of the polygonal workpiece with the aid of adjustable or interchangeable stops. The symmetry of the holes punched parallel to each other in relation to the workpiece is ensured by respectively rotating the workpiece to punch symmetrically arranged holes.
The device for carrying out the process according to the invention comprises a single punch and a fixed die with a passage for the punch and a bearing surface for the workpiece as lateral well as stops which exclude any rotation of the polygonal workpiece while punching and define the different angular positions as well as the position of each punched hole.
As a result of the polygonal form of the workpiece according to the invention and the predetermined angular positions in relation to the lateral s
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patent: 4373980 (1983-02-01), Skalmierski et al.
patent: 4491307 (1985-01-01), Ellefson
patent: 4619448 (1986-10-01), Leibinger et al.
patent: 5005618 (1991-04-01), Stegherr
patent: 5105696 (1992-04-01), Baubles
A Copy of the Preliminary Examination Report in original German language.
A Partial literal English language translation of the same.
H. Mauri, "Der Vorrichtungsbau", Part I, 1957, pp. 42-43, Fig. 183-184.
Pryor Sean
Rachuba M.
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