Drum (1) for a washing machine or a dryer including a cylindrical metal body part (100), reduced parts (110) at opposite ends of the body part, each having a diameter smaller than a diameter of the body part, and bent parts (120) each having a folded edge of the reduced part, thereby providing a drum that preventing occurrence of vibration and noise

Drum for washer and dryer

PROBLEM TO BE SOLVED: To provide a wet temper rolling method by which a steel sheet having the surface roughness (Ra) of a metallic strip which is specially desired. SOLUTION: About transfer efficiency (α(e, σy)) defined by the surface roughness (S) of a metallic strip after the temper rolling, the surface roughness (S 0 ) of the metallic strip before the temper rolling, thickness (H) and the roughness (Sw) of a work roll, a regression expression by the elongation percentage (e) at the temper rolling and the 0.2% yield strength (σy) of the metallic strip before the temper rolling is beforehand determined by experiments, the initial roughness (Sw 0 ) of the work rolls to be built-in in the temper rolling mill is determined from the surface roughness (S 0 ) of the metallic strip to be temper rolled, the thickness (H), the 0.2% yield strength (σy), an aimed elongation percentage (eaim) and the surface roughness (Saim) of the metallic after rolling on the basis of the transfer efficiency and the temper rolling is performed by selecting the work rolls near the surface roughness and building-in them into the temper rolling mill. COPYRIGHT: (C)2009,JPO&INPIT

Temper rolling method

The invention relates to a milling surface roughness online prediction method based on acoustic emission signals. An acoustic emission sensor is installed on a workpiece to be milled and used for monitoring the acoustic emission signals emitted by material deformation of the workpiece to be milled in the milling process of the workpiece. According to a theory that changes of milling thicknesses reflect milling surface roughness in a milling theory, sensitive reaction of the acoustic emission signals to the changes of the milling thicknesses in practical machining is used for analyzing and processing the detected acoustic emission signals emitted by the workpiece to be milled during milling of the workpiece so as to predict the magnitude of the milling surface roughness. According to the method, online prediction of the magnitude of the milling surface roughness during milling of the workpiece is achieved, the method has important significance on workpiece milling quality stabilizing, workpiece rejection rate reducing and milling efficiency improving, and meanwhile an important basis is provided for real-time prediction of reasonability of milling technological parameters in the milling process.

Milling surface roughness online prediction method based on acoustic emission signals

The invention discloses a method for temper rolling of ultra-low roughness guide rail steel. The method comprises the steps of adjusting the rolling mode of a leveling machine to a constant rolling force mode when a steel coil reaches the leveling machine; when the leveling machine is in the constant rolling force mode, setting the starting rolling force of the leveling machine as 2500-2800 KN; adjusting the tension value of front and rear tension rollers of the leveling machine; and setting the height of an inlet anti-wind anti-wrinkle roller of the leveling machine as 125-130 mm, the heightof an outlet anti-wind anti-wrinkle roller as 120-125 mm, and the initial speed of the leveling machine as 30-45 m/min, and then starting rolling, thereby obtaining the ultra-low roughness guide railsteel after rolling is completed. The technical problems that the ultra-low roughness guide rail steel is difficult to roll, and it is difficult for the wave shape, warpage and roughness indexes of the strip steel to meet the requirements of customers are solved. The technical effects that by setting the rolling force, tension and various rolling parameters of the anti-wind anti-wrinkle rollers and through the synergy of the rollers, the high-quality mass production of the ultra-low-roughness guide rail steel is achieved, and the customer requirements are met are achieved.

Method for temper rolling of ultra-low roughness guide rail steel

この方法において、以下の式の少なくとも１つが実証され、式中、Ｚは、主要な放出方向（Ｅ）に沿った金属シート（１）とノズル（１７）との間の距離であり、Ｚは、ｍｍで表現され、ｄは、ノズル（１７）の前側での金属シート（１）の走行方向（Ｓ）に沿ったノズル（１７）の出口（２５）の平均高さであり、ｄは、ｍｍで表現され、Ｖは、ノズル（１７）の前側での金属シート（１）の走行速度であり、Ｖは、ｍ・ｓ−１で表現され、Ｐは、ノズル（１７）内の拭きつけガスの圧力であり、Ｐは、Ｎ・ｍ−２で表現され、ｆＯ２は、拭きつけガス中の酸素の体積分率である。

ＺｎＡｌコーティングおよび最適化された拭きつけを用いて金属シートを製造するための方法、対応する金属シート、部品および車両

PROBLEM TO BE SOLVED: To provide a method for controlling a surface roughness of a steel band in a temper rolling which enables the surface roughness of the steel band to promptly and accurately enters into the target roughness limit at the time of performing the temper rolling with a rolling roll dull-processed even if the surface roughness of the steel band after the rolling deviates from the target roughness limit owing to the rolling roughness variation accompanying an increase of the rolling length. SOLUTION: When an actually measured surface roughness obtained through an actual measurement of the surface roughness after the rolling of the steel band deviates from the limit of the targeted steel surface roughness predetermined, elongation percentage is altered so that the roughness deviation between the upper limit value and the lower limit value of the range of the actual measurement of the surface roughness and the targeted steel surface roughness becomes zero.

Method for controlling surface roughness of steel band in temper rolling

PROBLEM TO BE SOLVED: To solve the adhesion of zinc powder onto skinpass rolls experienced at the time of production of hot dip zinc coated steel sheet featuring highly coarse zinc surface and further provide an improved skinpass rolling method that is capable of producing in high efficiency hot dip zinc coated steel sheet with a specified surface roughness. SOLUTION: This invention provides a rolling process for the production of hot dip zinc coated steel sheet where hot dip zinc coated steel sheet is skinpass rolled by skin pass work rolls of the surface roughness (Ra) ranging from 1.5 to 5.0 μm on the arithmetical average. Further the skinpass rolling coolant oil (solution) sprayed onto said skin pass work rolls and/or said steel sheet during the rolling contains surface active agent and/or chelate agent with the coolant viscosity controlled to 2.7 cp or less. COPYRIGHT: (C)2001,JPO

Kiyasu Tetsuya

Papers

Method for controlling surface roughness of steel band in temper rolling

Skinpass rolling method for hot-dip zinc coated steel sheet