Cross-roll piercing ranks as the leading piercing method for seamless tubes and offers considerable advantages compared to alternative methods such as piercing presses or …
The quality and accuracy of pipes produced by modern pipe-rolling plants are mainly dependent on the quality of the shells produced by piercing mills. Therefore, in designing rolling tool, followed by setting up a piercing mill, it is necessary to ensure that shells produced are of high accuracy and quality. To this end, the effect of changes in the …
The invention relates to a cross-rolling mill, having a plurality of roll shafts ( 1 ), each applying a radially directed rolling force to a workpiece, wherein orientation of a roll axis (w) of at least one of the roll shafts ( 1 ) adjustably changes about a first adjustment axis (S 1 ) and a second adjustment axis (S 2 ), wherein an intermediate member ( 9, 10 ) is …
FIELD: pipelines. SUBSTANCE: invention relates to pipe-making and can be used on piercing mills for rolling shell casings with water-cooled mandrels. Water-cooled mandrel of the piercing mill for the manufacture of sleeves is mounted on the tip of a hollow rod with a coolant supply tube. Mandrel is made with a cavity of variable cross-section, formed by …
This process consisting of individual technological nodes on the rolling mill, in which eccentricity is created on the piercing press and the following steps eliminate it in other technological nodes.
The cone-type piercing mill was developed on the basis of the structural characteristics of the Diescher piercing mill. It is a conical, two-high cross-rolling piercing mill with an active rotating guide disk and a large feeding angle (Fig. 2). The diameter of the tone-type roll increases gradually along the piercing deformation zone, so the ...
Schematic of rod rolling from scrap rail heads, with the dimension in mm: (a) rolling of a preform in a longitudinal mill; (b) rolling of a rod in a skew mill; (c) shapes of the blanks after the successive passes; 1,2—grooved rolls of the longitudinal mill; 3—rail head; 4,5—grooves forming a hexagonal pass; 6—blank with a nearly regular polygonal cross …
Keywords: continuous-cast semifinished product, cross-rolling piercing mill, thin-walled hollow, finite-element method. One of the main priorities of the Severskii Pipe Plant at present is to reduce the cost of producing the pipes that it makes. The company's success in achieving this goal will depend largely on the efficiency of the ...
US1999987A US672585A US67258533A US1999987A US 1999987 A US1999987 A US 1999987A US 672585 A US672585 A US 672585A US 67258533 A US67258533 A US 67258533A US 1999987 A US1999987 A US 1999987A Authority US United States Prior art keywords cross rolls collars roll work Prior art date Legal status (The legal …
Piercing is the first step of seamless tube manufactur-ing. It is followed by different kinds of rolling processes (tube expansion, wall thickness reduction, diameter reduc-tion).1) It can be performed by drilling or press forging or by the Mannesmann cross-roll piercing, schematically pictured in Fig. 1. In the latter, a full hot cylindrical ...
The invention relates to a method of rotary piercing in seamless tube manufacturing under a rotary piercing process, such as Mannesmann mandrel mill process. Rotary piercing operation is carried out by employing a rotary piercing mill having a pair of cone-shaped main rolls adapted to cooperate with a plug for rotary piercing and disc rolls …
The ECPH Encyclopedia of Mining and Metallurgy. Gao Xiuhua. First, the stripped circular billet goes through piercing or broaching. After induction heating or salt …
and thus considered in this study. Skew-roll piercing is the first step in the seamless tube forming process, the hollow part of the billet is generated in a mill that can be set up with different dispositions. There are mills with two or three director rolls, but in general two roll mills are more common in the industry [2].
element modeling. New piercing-mill equipment has been developed to make thin-walled hollows. Computer software is used to evaluate the optimality of the mill's settings. …
The authors evaluate the degree of agreement between results obtained from piercing continuous-cast semifinished products on a cross-rolling piercing mill and the indices of this process determined by finiteelement modeling. New piercing-mill equipment has been developed to make thin-walled hollows. Computer software is used to evaluate …
Seamless tube manufacturing usually starts with hot cross-rolling in a piercer mill. Piercing is the first process step to make tube with a high-quality wall. This step usually is followed by one or more elongation processes that can improve wall quality while also increasing tube length. After the tube leaves the seamless mill and cools, it ...
The piercing with the use of two-roll mills having barrel-shaped rolls has become widespread owing to the following features: a favorable technique for obtaining sleeves with a diameter that differs from the billet diameter by no more than 10%; the lowest slipping level in contact with the rolls under satisfactory gripping conditions; a much …
Abstract. In this paper the friction conditions between the rolls and the workpiece of a hot skew roll piercing mill are studied. For that purpose a modified model of the process without the inner ...
rolling rolling mill movable flange movable Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Granted Application number DE2814493A Other languages German (de) Other versions ...
The purpose of the research reported here was to establish how plug shape influences the size and porosity of hollow shells produced by Mannesmann piercing of an ingot. Ingots were cast from 6060 aluminium alloy and then pierced with a solid plug, a plug with a cavity or a hollow plug. Computer simulation of these processes was carried out …
A numerical parametric study on friction in cross-roll tube piercing is reported in this paper, in order to assess the role of the different friction coefficients on the different parts of...
Pater et al. used also this model to compare the RTP process in two and three-roll mills. Murillo-Marrodán et al. [28,29] used this formulation for the ... Yu E., Yan T. Deformation analysis of seamless steel tube in cross rolling piercing process; Proceedings of the 2010 International Conference On Computer Design and Applications ...
Although eccentricity is mainly caused by abnormal process conditions in the cross-roll piercing mill, most seamless tube plants lack the monitoring at the hot piercing stage but only inspect the ...
RU2378062C1 Manufacturing method of bushings cross-screw rolling mill. CN103917308B The manufacture method of the plug that punching machine, punching machine use and seamless steel pipe. US20130074563A1 Tube rolling plant. RU2250147C1 Method for helical piercing of cast billet.
Piercing mills that count with two rolls are the most extended ones. In addition, they are sorted in Diescher's or Stiefel's mills when their guides are discs or shoes respectively …
Piercing mills that count with two rolls are the most extended ones. In addition, they are sorted in Diescher's or Stiefel's mills when their guides are discs or shoes respectively [2]. Recently three-roll mills are becoming popular as they do not require guiding devices and tandem solutions have been evaluated [3].
Indian Institute of Technology Kharagpur. Abstract and Figures. The chapter deals with cross rolling where the workpiece is rotated by 90° in the rolling plane after …
- piercing by cross rolling with an elongation at the cross rolling stand by Diescher's discs with the retained mandrel, developed by Aetna Standard Co. in 4 versions ... the modern continuous mills use skew roll piercing mills with tapered rolls and guide discs. Taking into consider-ation the fact that two or three billet sizes are rolled at a
Many seamless tube producers in North America use cross-roll piercing mills built in the 1950s that were based on designs from the1930s. While it would be advantageous to replace such aged equipment, that isn't always necessary. A minor equipment upgrade can do wonders. Improving the bar steadiers—the devices that hold …
The CPE (Cross Roll Piercing and Elongation) process begins with the piercing of a hot billet on the piercer, followed by crimping and then elongation on the push-bench and finally the dimensions are controlled within specified variation on the Stretch Reducing Mill (SRM). This process minimises longitudinal and transverse defects in pipes and ...
Piercing is the first step of seamless tube manufacturing. It is followed by different kinds of rolling processes (tube expansion, wall thickness reduction, diameter reduction). 1) It can be performed by drilling or press forging or by the Mannesmann cross-roll piercing, schematically pictured in Fig. 1.In the latter, a full hot cylindrical billet is entrained by two …
CF01 Termination of patent right due to non-payment of annual fee. The present invention relates to a hot-rolling metal seamless pipe three-roll piercing mill which is characterized in that the piercing mill is formed by the method that a three-roll punching mill and a three-roll pipe mill are combined into a whole so as to form a ...
A solid billet is piercing-rolled using a 4 roll-type inclined rolling mill including larger-diameter cone-type main rolls arranged horizontally or vertically to face each other across a pass line and smaller-diameter auxiliary rolls arranged vertically or horizontally to face each other similarly across the pass line between the facing main …
Cross-roll piercing and cross helical rolling. Cross-roll piercing simulation in QForm. Plastic strain distribution field in the cross section Cross-roll piercing (rotary tube …
A tube making mill setup includes an induction heater for a billet, with means to transfer the heated billet directly to a piercing machine. The piercing machine includes main driving and gripping rolls on skewed axes and which drive the billet onto a piercing point. Upper and lower control rolls have axes parallel to the direction of billet drive through the machine.
In a rolling mill or the like, a rotary head,-.a plurality of rolls carried thereby, slidable" roll-carrying frames in the head, right and left hand screws connecting the frames, pinions carried by said screws, racks meshing with said pinionsyand means. for inovin the racks. r" V 10, n a rolling mill or the like, a rotary head a. plurality of ...
Context 1. ... the power consumed by the piercing mill is validated. Figure 3 compares the power consumption of model 1 (α=0.27) with experimental data of the piercing process, …
