摘要:
A process and a system are proposed for short-time arc-welding elements, such as for example metal studs, on to components, such as for example metal sheets, wherein an element in the context of a welding operation is initially raised in relation to the component, a welding arc is formed between the element and the component, and the element is lowered again, the lifting height of the element in relation to the component being detected at least within a time segment between raising and lowering of the element. The initiation of the lowering operation and/or the lowering operation itself is controlled as a factor of the detected lifting height such that a previously specified total welding time is achieved.
摘要:
A process and a system are proposed for short-time arc-welding elements, such as for example metal studs, on to components, such as for example metal sheets, wherein an element in the context of a welding operation is initially raised in relation to the component, a welding arc is formed between the element and the component, and the element is lowered again, the lifting height of the element in relation to the component being detected at least within a time segment between raising and lowering of the element. The initiation of the lowering operation and/or the lowering operation itself is controlled as a factor of the detected lifting height such that a previously specified total welding time is achieved.
摘要:
A heating current used to inductively heat a metallic or magnetic work-piece is generated by an inverter supplied by a supply voltage. The inverter includes four switching elements arranged in an H-bridge circuit having two parallel longitudinal branches and a transverse branch. The switches are controlled so the heating current flows through the transverse branch. The diagonally opposed switching elements are switched from a conductive to a non-conductive state in a temporally staggered manner.
摘要:
A heating current used to inductively heat a metallic or magnetic work-piece is generated by an inverter supplied by a supply voltage. The inverter includes four switching elements arranged in an H-bridge circuit having two parallel longitudinal branches and a transverse branch. The switches are controlled so the heating current flows through the transverse branch. The diagonally opposed switching elements are switched from a conductive to a non-conductive state in a temporally staggered manner.
摘要:
A heating current used to inductively heat a metallic or magnetic work-piece is generated by an inverter supplied by a supply voltage. The inverter includes four switching elements arranged in an H-bridge circuit having two parallel longitudinal branches and a transverse branch. The switches are controlled so the heating current flows through the transverse branch. The diagonally opposed switching elements are switched from a conductive to a non-conductive state in a temporally staggered manner.
摘要:
A metallic flat gasket with a solid bead has at least one metallic layer (2), wherein the metallic gasket comprises at least one solid bead (6), which is formed in at least one layer (2) of the metallic gasket, wherein the solid bead (6) comprises two flanks (8, 10) lying opposite one another. The gasket comprises, between the two flanks (8, 10) in the circumferential direction of the solid bead (6), at least one row (12, 14, 16) of adjacent depressions or bead sections (18, 20, 22), which in each case form an integral contour with the solid bead (6) and are orientated in the opposite direction with respect to the solid bead (6).
摘要:
The invention relates to a metal cylinder head gasket provided with at least one opening corresponding to a combustion chamber of an internal combustion engine, comprising a function layer and an annular support arranged thereon. The functional layer comprises one full bead. The cylinder head gasket is characterized in that the annular support comprises one full bead which is defined on the functional layer, and the annular support comprises one bead which is arranged on the side of the full bead which is oriented away from the combustion chamber The invention also relates to a metal cylinder head gasket provided with at least one opening corresponding to a combustion chamber of an internal combustion engine, comprising an upper functional layer, an annular support and a lower functional layer. The annular support is arranged between the upper functional layer and the lower functional layer and is adjacent to the lower functional layer. The upper functional layer comprises one full bead which is adjacent to the annular support. The cylinder head gasket is characterized in that the lower functional layer comprises one bead which is arranged on the side of the full bead which is oriented away from the combustion chamber.
摘要:
A sealing ring for components of an internal combustion engine, with a first and a second axial sealing zone, includes an inner closed ring with a V-shaped cross-section, and an outer closed ring with a V-shaped cross-section. The open side of the outer closed ring points in the same direction as that of the inner ring.
摘要:
A process for the production of a suspension of crystalline and/or densified, surface-modified nanoscale particles in a dispersant. The process comprises: (a) heat-treating a suspension of amorphous or semicrystalline, non-surface-modified nanoscale particles in a first dispersant to obtain crystallized and/or densified particles; and (b) mechanically activating, in the presence of at least one modifying agent, the particles obtained according to (a) as a suspension in the first dispersant or in a different dispersant to obtain a suspension of crystalline and/or densified nanoscale particles which are surface-modified by the at least one modifying agent.
摘要:
The present invention relates to flat metallic gaskets, such as, for example, cylinder head gaskets on internal combustion engines, with at least three layers, namely a mid-layer, a function layer and a layer of a compression limiter. The mid-layer is arranged between the function layer and the compression limiter. The mid-layer has at least two essentially round fixing openings, outside a sealing region. The compression limiter is beaded around the edges of the fixing openings in the region thereof, and in this way fixes the compression limiter to the mid-layer. The function layer has recesses in the region of the fixing openings of the mid-layer, in order to accommodate the beaded region of the compression limiter, without increasing the total thickness of the gasket in the region of the fixing of the compression limiter.