CN102837162A

CN102837162A - Method for producing thick-wall hollow valve cores of large-scale ball valves

Info

Publication number: CN102837162A
Application number: CN2012103625759A
Authority: CN
Inventors: 张轩
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-09-26
Filing date: 2012-09-26
Publication date: 2012-12-26
Anticipated expiration: 2032-09-26
Also published as: CN102837162B

Abstract

The invention discloses a method for producing thick-wall hollow valve cores of large-scale ball valves. The method comprises the following specific steps of: a. selecting a steel plate as a material; b. rolling the thick steel plate selected in the step a into a circular pipe shape so as to finally obtain a thick-wall seamed steel pipe; c. respectively chamfering the outer walls of two orifices of the steel pipe obtained in the step b into circular conical surfaces; d. pre-pressing the outer walls of the two orifices of the steel pipe obtain in the step c into arc-shaped surfaces; and e. arranging an upper die and a lower die on a press, placing the steel pipe obtained in the step d in the lower die, and combining and pressurizing the upper and lower dies to obtain a finished thick-wall hollow valve core. According to the method, the complicated computing and lofting are not required and the splicing and the welding are also not required, so that the process is markedly simplified, the process difficulty is reduced, the product precision is reliably ensured, the processing cost is reduced, and excellent technological and economical values are provided, so that the method is suitable to large-scale popularization and application.

Description

The heavy wall hollow spool production method of large-scale ball valve

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Technical field

The invention belongs to large-scale ball valve element and make the field, specifically, relate to a kind of method of producing large-scale ball valve heavy wall hollow spool.

Background technology

Large-scale ball valve generally is meant the valve of latus rectum DN >=300mm, and it is widely used in fields such as oil transportation route, chemical industry, power equipment.The heavy wall hollow spool is the vitals of large-scale ball valve, and it is used for the flow regime of control valve in-core fluid.At present; The heavy wall hollow spool of producing large-scale ball valve generally adopts following steps: at first on steel plate, calculate, setting-out; Secondly on press according to the parts of the data processing multi-disc melon lobe formula of setting-out, the parts with multi-disc melon lobe formula are stitched together then, form the shape of heavy wall hollow spool; At last that the parts welding of adjacent two melon lobe formulas is fixing, finally obtain heavy wall hollow spool finished product.

In process of production, we find that the production technology of existing heavy wall hollow spool is comparatively complicated, need carry out miscellaneous calculating and setting-out; And operation is many; The precision of product is difficult to reliably guaranteed, production cost is also than higher in addition, needs badly to solve the problems of the technologies described above for this reason.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of heavy wall hollow spool production method of large-scale ball valve, with simplification technology, and the precision of assurance product.

Technical scheme of the present invention is introduced a kind of heavy wall hollow spool production method of large-scale ball valve, and its concrete step is following:

A, selection, material are steel plate, and the thickness of steel plate is 50～200mm;

B, pipe crimping, through large-scale veneer reeling machine with step a select steel plate be rolled into the pipe shape, weld the slit of joint again, finally obtain the heavy wall seamed steel pipe, and the latus rectum DN >=2.6m of steel pipe;

C, the rounding conical surface, two mouth of pipe outer walls with step b gained steel pipe fall into taper seat respectively;

D, precompressed, at first a mouth of pipe with step c gained steel pipe is heated to 850 ℃～900 ℃, on forcing press, the outer wall of this mouth of pipe is pressed into arcwall face again; Then with steel pipe switching-over, another mouth of pipe of step c gained steel pipe is heated to 850 ℃～900 ℃, on forcing press, the outer wall of this mouth of pipe also is pressed into arcwall face again;

E, moulding; At first on the table top of forcing press, counterdie is set, and on pressure head fixing patrix, and upper die and lower die are the hemisphere shell-like structure; The steel pipe that then steps d is made is put into counterdie; Obtain the heavy wall hollow spool of finished product after the pressurization of upper die and lower die matched moulds, and the latus rectum DN >=500mm of gained heavy wall hollow spool, and the wall thickness of heavy wall hollow spool is 50～200mm.

Because the seamless steel pipe latus rectum DN that now can buy on the market is smaller, and general≤800mm, the satisfactory steel pipe of latus rectum so at first need be obtained.In above-mentioned processing method, step b with step a select steel plate be rolled into seamed steel pipe, and the steel pipe latus rectum DN >=2.6m that makes.What this need specify be, need do not adopt step a and b when making small-sized thin-walled hollow spool, only need to process purchasing a ready-made seamless steel pipe on the market.

As for step c then is for the ease of the carrying out smoothly of steps d, and two mouth of pipe outer wall chamfering taperings of steel pipe can be between 30 ° to 45 ° and 60 °, and this taper seat plays guiding, transmits pressure.

Steps d earlier with two mouths of pipe of steel pipe precompressed camber face roughly, obtains finished product heavy wall hollow spool through step e at last.

are compared with existing manufacturing technique, and this production method need not be carried out complicated calculation, setting-out, also need not splice and weld; So just simplified technology significantly; Reduced technology difficulty, and can guarantee the precision of product reliably, cut down finished cost; Have good technology and economic worth, be suitable for the large-scale promotion utilization.

In the present invention, the pressure of used forcing press is preferably 2000T～8000T among said steps d and the e, and the pressure ratio of used forcing press is more moderate, can work the work piece into type, can avoid again that pressure is excessive to cause unnecessary waste.

In above production method, step c accomplishes on lathe or emery wheel grinding machine or beveler, and two mouth of pipe outer wall chamfering taperings of steel pipe are 30 ° to 45 °.

Certainly, satisfying under the prerequisite of processing request, we also can come completing steps c according to existing equipment at hand.In addition, two mouth of pipe outer wall chamfering tapering size to fits of steel pipe, the effect that this taper seat can play guiding well, transmit pressure.

In the present invention, said material is preferably corrosion resistant plate.

Beneficial effect: this production method need not be carried out complicated calculation, setting-out, also need not splice and weld, and has so just simplified technology significantly; Reduced technology difficulty, and can guarantee the precision of product reliably, cut down finished cost; Have good technology and economic worth, be suitable for the large-scale promotion utilization.

Description of drawings

Fig. 1 is by the change in shape sketch map of raw material to finished product when adopting this production method to produce the heavy wall hollow spool.

The specific embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is described further:

With reference to Fig. 1, a kind of heavy wall hollow spool production method of large-scale ball valve, its steps in sequence is following:

A, selection, material are steel plate, and this steel plate is preferably corrosion resistant plate, and the thickness of steel plate is 50～200mm, and the length of steel plate is according to the latus rectum DN decision of the required steel pipe of step b.

B, pipe crimping, through large-scale veneer reeling machine with step a select steel plate be rolled into the pipe shape, weld the slit of joint again, finally obtain the heavy wall seamed steel pipe, and the latus rectum DN >=2.6m of steel pipe.

C, the rounding conical surface, two mouth of pipe outer walls with step b gained steel pipe fall into taper seat respectively, and the tapering of taper seat is preferably 30 ° to 45 °.In addition, step c accomplishes on lathe or emery wheel grinding machine or beveler.

D, precompressed at first are heated to 850 ℃～900 ℃ with the mouth of pipe of step c gained steel pipe in heating furnace, on forcing press, the outer wall of this mouth of pipe is pressed into arcwall face again.With steel pipe switching-over, another mouth of pipe with step c gained steel pipe in heating furnace is heated to 850 ℃～900 ℃ then, on forcing press, the outer wall of this mouth of pipe also is pressed into arcwall face again.In addition, the pressure >=2000T of institute's employing forcing press in the steps d.

E, moulding at first are provided with counterdie on the table top of forcing press, and on pressure head fixing patrix, and upper die and lower die are the hemisphere shell-like structure.Then, a mouth of pipe of steps d gained steel pipe is put into counterdie, obtain the heavy wall hollow spool of finished product after the pressurization of upper die and lower die matched moulds, this heavy wall hollow spool is the spherical shape structure, and the center has via hole.Latus rectum DN >=the 500mm of above-mentioned gained heavy wall hollow spool center via hole, and the wall thickness of heavy wall hollow spool is 50～200mm.In addition, the pressure >=2000T of used forcing press among the said step e.

The above is merely preferred embodiment of the present invention, is not restriction with the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to replacement and improvement etc., all should be included within protection scope of the present invention.

Claims

1. the heavy wall hollow spool production method of a large-scale ball valve, its step is following:

2. according to the heavy wall hollow spool production method of the said large-scale ball valve of claim 1, it is characterized in that: the pressure >=2000T of used forcing press among said steps d and the e.

3. according to the heavy wall hollow spool production method of claim 1 or 2 said large-scale ball valves, it is characterized in that: step c accomplishes on lathe or emery wheel grinding machine or beveler, and two mouth of pipe outer wall chamfering taperings of steel pipe are 30 ° to 45 °.

4. according to the heavy wall hollow spool production method of the said large-scale ball valve of claim 1, it is characterized in that: said material is a corrosion resistant plate.