All-Steel Fitting
AssigneeGroz-Beckert KG
InventorsJohannes Bruske, Peter Meinert, Carmen Goltermann, Bernd Binder
Life of this patent
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Abstract
In the method according to the invention, a wire (11) provided with teeth (15) passes sequentially through a first inductor (16) and a second inductor (18). The inductors (16, 18) function at different frequencies and generate different temperatures. The first inductor (16) heats in particular the base section (17), which is not to be hardened, to a high temperature below the austenitizing temperature range. The second inductor (18) heats the teeth (15) to a still higher second temperature within the austenitizing temperature range. Defined, hardened teeth of consistently high quality result at quenching.
Claims16
Method for the production of an all-steel card clothing for carding machines, wherein the method comprises:
- providing a wire (11) having a base section (17) and a wall section (23) that extends away from the base section (17) and has a lower thickness (D15) than said base section,
- applying recesses (14) in the wall section (23) of raw material wire (12) in order to form teeth (15),
- in feed-through mode, heating at least the base section (17) of the wire (11) to a first temperature (t1),
- in feed-through mode, at least sectionwise induction heating the wall section (23) of the wire (11), said wire having been preheated at least on the base section (17), by at least one inductor (18) at a specific frequency (f2) to a second temperature (t2),
- wherein the second temperature (t2) is higher than the first temperature (t1),
- in feed-through mode, quenching at least the wall section (23) of the wire (11) with a cooling medium.
All-steel card clothing comprising a wire (11) defining a longitudinal direction (L), said wire having a base section (17) and a wall section (23) with teeth (15) having a tooth height (H15), said wall section having at least one section (19) having increased hardness and extending away from the base section (17),
- wherein the base section (17) has a greater thickness (D17) than the wall section (23), and
- the wall section (23) has a boundary following a straight line defining a transition zone (24) extending parallel to the longitudinal direction (L), in which transition zone wall section has the increased hardness begins and a width (H24) of which amounts to at most 20% of the tooth height (H15).
Dependencies are inferred from the claim text.