35results about How to "Improve width precision" patented technology

An edge exposure apparatus performing an exposure process on an edge portion of a wafer having a coating film (resist film) formed thereon includes position detection means for detecting positional data of an outer edge of a wafer held by a spin chuck, an exposure portion for performing an exposure process on the edge portion of the wafer, a development nozzle supplying a developer to the exposed region, and alignment means for horizontally moving the spin chuck. An exposure process is performed by the exposure portion on the edge portion of the wafer held by the spin chuck while the alignment means is controlled, based on the positional data of the outer edge of the wafer which is detected by the position detection means, such that the positional relation between the outer edge of the wafer and the exposure portion is kept constant.

The invention discloses a method for controlling transverse rolling width and longitudinal rolling width of a moderately-thick plate, and relates to the technical field of pressure processing of metals. The method comprises the following steps: A, setting rolling procedures, wherein the rolling reduction of all passes before the last pass in the transverse rolling stage is set according to the maximum allowable load which can be borne by a rolling machine; B, shooting a shape image of the side surface of a rolling part in front of an inlet of the last pass so as to obtain the ratio of the effective width of the middle part of the rolling part in the image to the thickness of the rolling part in the image, and synchronously measuring the actual thickness of the rolling part at the moment to obtain the width deviation; C, calculating the compensation rolling reduction of the last pass of the rolling part according to the width deviation, summing the compensation rolling reduction and the set rolling reduction of the last pass to obtain the compensated rolling reduction of the last pass, and then adjusting the roll gap value of the last pass or the last two passes according to the compensated rolling reduction, so as to obtain the expected effective width of the middle part of the finished product of the rolling part. Compared with the prior art, the method has the advantage that the width accuracy of the moderately-thick plate in the transverse rolling stage can be effectively improved.

The invention provides a production method of a hot dipped steel coil. The method comprises steps of hot rolling, cold rolling, annealing, galvanizing and straightening on a billet. The batching temperature of the hot rolling is 500-550 DEG C; and the billet contains, calculated by a total weight of the billet, 0.04-0.1 wt% of carbon, 0.2-0.5 wt% of manganese, 0.06-0.09 wt% of phosphorus and 0.015-0.03 wt% of niobium. The method provided by the invention can obtain structural hot dipped steel coil with high width precision, and yield strength level of grade 350M Pa.