CN102990011A

CN102990011A - Casting molding process of large hook body cast steel element for petroleum drilling machine

Info

Publication number: CN102990011A
Application number: CN2012104464453A
Authority: CN
Inventors: 蒋春宏; 刘彩贤; 韩起超; 陈永丽
Original assignee: LANZHOU LANSHI CASTING CO Ltd
Current assignee: LANZHOU LANSHI CASTING CO Ltd
Priority date: 2012-11-09
Filing date: 2012-11-09
Publication date: 2013-03-27

Abstract

The invention provides a casting molding process of a large hook body cast steel element for a petroleum drilling machine, which belongs to a casting technology of hook body cast steel elements for petroleum machinery. According to the technical scheme, a modeling parting surface 3 is selected along the central line of a hook body 1 and the profile line on the inner side of a main hook 9; a technology tie bar is arranged between the main hook 9 and a cylinder body 2 and acts as an ingate 10 of a gating system, and a bottom return gate 11 and a stepped gate 8 are combined with the gating system; an arch back 7 is provided with two dead heads 6; the upper part of the cylinder body 2 at the hook body is additionally provided with a slag collecting dead head 4; and four outer molding cold iron blocks 5 are configured at an auxiliary hook 12. By virtue of the casting process provided by the invention, a large produced hook is good in molding, and a formed base body is compact in structure; all parts are checked according to an API8C standard, and all surfaces are checked according to an ASMEE709 standard, and the quality levels are all level I; the process is simple and convenient, materials are saved, and the mechanical property of the hook is good; and compared with the prior art, the casting molding process has the advantages of improving the product yield, lowering the production cost, and achieving good economic benefits.

Description

Oil-well rig is with the cast shaping process of large-scale hook body steel-casting

Technical field

The invention belongs to the casting field of large-scale hook body steel-casting.

Technical background

The hook body is one of vitals of oil drilling and r eoovery machine elevator system, and when assembling was used, the tap that the hook body hangs was the connection bearing object of heavy duty, variable load with a complete set of drilling tool.Particularly 9000 meters oil-well rigs are with hook body rated load 6750KN, and its examination requirements is strict, and its safety and reliability directly has influence on the safety and reliability of whole bench drill machine, must meet oil drilling and r eoovery machine API 8C standard.Conventional hook body cast shaping process design needs 15 cores to close, and moulding needs 62 man-hours, and the expense material is taken a lot of work, and difficulty reaches API 8C standard-required.

Summary of the invention

Purpose of the present invention: make hook body casting meet oil drilling and r eoovery machine API 8C standard, and material-saving, saving of labor.

Technique main feature of the present invention is divided into that die joint is chosen, Design of Runner System, Feeder Design and chill are arranged four aspects, and its concrete process characteristic is as follows:

1. choose along hook body 1 center line and main hook 9 nearside wheel profiles at moulding die joint 3, design technology lacing wire between main hook 9 and the cylindrical shell 2 with the ingate 10 of lacing wire as running gate system, adopts the end to return cast gate 11 and step gate 8 associating running gate systems; The back of a bow 7 positions arrange 2 rising heads 6, add scum riser 4 on hook body cylindrical shell 2 tops;

The benefit of doing like this is: be chosen at along comparing on the hook body back of a bow 7 large planes with the traditional handicraft die joint, die joint has rotated 90 ° along hook body center line, reduced the quantity of core, be convenient to mould assembling and check relevant cavity dimension, reduced time core assembling deviation, molding operation is convenient, has improved each spot size precision of foundry goods; . the design technology lacing wire prevents casting deformation between main hook 9 and cylindrical shell 2, guarantees dimensional accuracy.With the ingate 10 of lacing wire as running gate system, adopt the end to return cast gate 11 and step gate 8 associating running gate systems, Filling Processes of Castings is steady, avoid pouring into a mould sand washing, the directed flow of molten steel when this running gate system can realize the foundry goods casting, each type impurity is collected in the rising head, reduce foundry goods sand holes, be mingled with the class defective; . hunchbacked 7 positions arrange 2 rising heads 6, add scum riser 4 on hook body cylindrical shell 2 tops, the back of a bow 7 and main hook 9 are main force parts of hook body 1, adopt this rising head set-up mode, and feeding is abundant, the dense structure that forms, it is remarkable to collect simultaneously the slag effect, and when less rising head adopted the oxy-acetylene flame cutting to remove, surface quality was good, be not easy to crack, reduced the workload of polishing operation;

2. 4 formation of lots external chills 5 have been arranged at auxiliary hook 12 places.

The benefit of doing like this is: accelerated cooling velocity herein, realized the consecutive solidification of foundry goods, reduced the casting stress of foundry goods and shrinkage porosite, crack defect.

Advantage of the present invention, the hook forming of adopting casting technique of the present invention to produce, the matrix of formation is fine and close, meets oil drilling and r eoovery machine API 8C product requirement, and it is 100% qualified to check.According to API 8C PSL-2 requirement, exemplar is adopted ASME V, 2010, an A piece of writing the 5th a Zhanghe B piece of writing the 23rd chapter carries out ultrasonic inspection to all sites, 1 grade of quality level; Adopt ASME E709 that all surface is carried out magnetic powder test, and carry out the result according to ASME E125 and judge 1 grade of quality level.Now only need 4 cores to close, moulding only needs 20 man-hours.Manufacture craft of the present invention is easy, and save moulding and smelt material, good mechanical properties, compare with the cast shaping process of traditional production hook body yield rate and the rate of output improve, and production cost descends, and has improved economic benefit.

Description of drawings

Fig. 1 is cast shaping process die joint of the present invention, rising head, chill and Design of Runner System schematic diagram.

Return cast gate 12-auxiliary hook at the bottom of the 1-hook body 2-cylindrical shell 3-die joint 4-scum riser 5-chill 6-rising head 7-back of a bow 8-step gate 9-main hook 10-ingate 11-.

The specific embodiment

Embodiment 1, adopts cast shaping process shown in the accompanying drawing, uses wooden mold, and the furane resins sand molding, and production load is the hook body of 2250KN, and hook body gross weight is 810kg, and dead head heavily is 390kg, and yield rate 67.5% has been produced 38 with this technique altogether trial-production.According to API 8C PSL-2 requirement, adopt ASME V, 2010, an A piece of writing the 5th a Zhanghe B piece of writing the 23rd chapter carries out ultrasonic inspection to all sites, 1 grade of quality level; According to API 8C PSL-2 requirement, adopt ASME E709 that all surface is carried out magnetic powder test, and carry out the result according to ASME E125 and judge 1 grade of quality level.

Embodiment 2, adopt cast shaping process shown in the accompanying drawing, use wooden mold, and the furane resins sand molding, and production load is the hook body of 4500KN, and hook body gross weight is 1720kg, and dead head heavily is 1100kg, and yield rate 61% has been produced 29 with this technique altogether trial-production.According to API 8C PSL-2 requirement, adopt ASME V, 2010, an A piece of writing the 5th a Zhanghe B piece of writing the 23rd chapter carries out ultrasonic inspection to all sites, 1 grade of quality level; According to API 8C PSL-2 requirement, adopt ASME E709 that all surface is carried out magnetic powder test, and carry out the result according to ASME E125 and judge 1 grade of quality level.

Embodiment 3, adopt cast shaping process shown in the accompanying drawing, use wooden mold, and the furane resins sand molding, production load is the hook body of 6750KN, hook body gross weight is 3250kg, dead head heavily is 2150kg, and yield rate 60.2% has been produced 15 with this technique altogether trial-production.According to API 8C PSL-2 requirement, adopt ASME V, 2010, an A piece of writing the 5th a Zhanghe B piece of writing the 23rd chapter carries out ultrasonic inspection to all sites, 1 grade of quality level; According to API 8C PSL-2 requirement, adopt ASME E709 that all surface is carried out magnetic powder test, and carry out the result according to ASME E125 and judge 1 grade of quality level.

Claims

1. an oil-well rig is with the cast shaping process of large-scale hook body steel-casting, it is characterized in that moulding die joint (3) chooses along hook body (1) center line and main hook (9) nearside wheel profile; Design technology lacing wire between main hook (9) and cylindrical shell (2) with the ingate (10) of lacing wire as running gate system, adopts the end to return cast gate (11) and step gate (8) associating running gate system; The back of a bow (7) position arranges 2 rising heads (6), adds scum riser (4) on hook body cylindrical shell (2) top.

2. a kind of oil-well rig according to claim 1 is characterized in that locating to have arranged 4 formation of lots external chills (5) at auxiliary hook (12) with the cast shaping process of large-scale hook body steel-casting.