Ludwig Hettich & Co.
Ludwig Hettich & Co. Patent applications | ||
Patent application number | Title | Published |
---|---|---|
20120316000 | Method and Rolling Die for Manufacturing A Screw - A method for manufacturing a screw is disclosed where a blank is rolled between two rolling dies. In each rolling die a rolling profile has been formed that comprises a host of elongated depressions. The rolling die has a first and a second end which are spaced apart from each other in the direction of rolling. During rolling, the blank is moved relative to the die from the first end in the direction of the second end. The mean pitch of the centre lines of the depressions, which pitch is defined as the quotient of the changes in the positions of the centre line in the direction across or parallel to the direction of rolling, in a region of the first end of the rolling die differs from the mean pitch in a region of the second end of the rolling die. | 12-13-2012 |
20120309548 | Method and Rolling Die for Producing a Screw with A Variable Thread Pitch - Disclosed herein is a method for manufacturing a screw comprising a continuous thread with a variable thread pitch, in which method a blank is rolled between two rolling dies, wherein in each rolling die a rolling profile is formed that comprises a host of curved non-parallel depressions. The depressions are designed and arranged in such a manner that during rolling no volume transport, or as little volume transport as possible, in the axial direction takes place, or a volume transport from a region of the blank where a thread section with a larger thread pitch is to be formed, to a region in which a thread section with a smaller thread pitch is to be formed takes place. | 12-06-2012 |