Method and apparatus for making nipple holes in a double-walled hollow wheel rim of a spoke wheel
AssigneeHolland Mechanics B.V.
InventorJasper Johannes Wessels
Life of this patent
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Abstract
The invention relates to a method of making nipple holes or similar holes in a double-walled wheel rim having an inner wall positioned radially inward and outside of that an outer wall. The holes are made by punching by means of a punching tool provided with a cutting edge whereby the cutting edge is moved successively through the outer wall and the inner wall of the wheel rim and a punch die supporting the inner wall. The invention encompasses also an apparatus for the application of this method.
Claims16
An apparatus for punching holes in a double-walled hollow wheel rim comprising:
- a punching die for locally supporting an inside wall of the wheel rim around the hole to be made,
- a punching tool with a cutting edge which is movable from a start position at a distance from the punching die to a stop position wherein the cutting edge is inside the punching die and
- drive means for the punching tool wherein the drive means can accelerate the punching tool to a speed of at least 10 m/sec between its start position and before the cutting edge touches an outside wall of a double-walled hollow wheel rim which is positioned with the inside wall against the punching die.
A method for making aligned holes in both walls of a double-walled hollow wheel rim, the wheel rim comprising an inside wall and an outside wall, the method comprising the following steps:
- positioning the inside wall of the wheel rim against a punching die, which mainly supports the wheel rim locally around the hole to be made, and
- punching with a cutting edge of a punching tool from the outside toward the center of the wheel rim in a continuous movement through both walls of the wheel rim and into the punching die.
A method for making aligned holes in both walls of a double-walled hollow wheel rim, the wheel rim comprising an inside wall and an outside wall, the method comprising the following steps:
- positioning the inside wall of the wheel rim against a punching die, which mainly supports the wheel rim locally around the hole to be made,
- punching with a cutting edge of a punching tool provided with an expansion part from the outside toward the center of the wheel rim in a continuous movement through both walls of the wheel rim and into the punching die, and
- stopping the movement of the punching tool before the expansion part reaches the inside wall.
A method for making aligned holes in both walls of a double walled hollow wheel rim, the wheel rim comprising an inside wall and an outside wall, comprising the following steps:
- positioning the inside wall of the wheel rim against a punching die, which mainly supports the wheel rim locally around the hole to be made,
- punching with the cutting edge of a punching tool provided with an expansion tool from the outside toward the center of the wheel rim in a continuous movement through both walls of the wheel rim and into the punching die, and
- stopping the movement of the punching tool before the expansion tool reaches the inside wall by absorbing the kinetic energy of the punching tool in a hydraulic buffer.
A method for making aligned holes in both walls of a double-walled hollow wheel rim, the wheel rim having an inside wall and an outside wall, comprising the following steps:
- positioning the inside wall of the wheel rim against a punching die, which mainly supports the wheel rim locally around the hole to be made,
- punching with the cutting edge of a punching tool provided with an expansion tool from the outside toward the center of the wheel rim in a continuous movement through both walls of the wheel rim and into the punching die, and
- stopping the movement of the punching tool before the expansion tool reaches the inside wall by absorbing the kinetic energy of the punching tool in a hydraulic buffer and removing the absorbed kinetic energy with the aid of a fluid.
Dependencies are inferred from the claim text.