CN100402184C - Integrated die forge forming method for flange valve - Google Patents
Integrated die forge forming method for flange valve Download PDFInfo
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- CN100402184C CN100402184C CNB2006100467033A CN200610046703A CN100402184C CN 100402184 C CN100402184 C CN 100402184C CN B2006100467033 A CNB2006100467033 A CN B2006100467033A CN 200610046703 A CN200610046703 A CN 200610046703A CN 100402184 C CN100402184 C CN 100402184C
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Abstract
A method for manufacturing the whole valve body of a flanged valve by die forging includes such steps as blanking, primary forging to make its external diameter greater than that of flanges at both ends, pressing its middle part, unidirectional forging, cutting off edge, and fine forging.
Description
Technical field:
The present invention relates to a kind of whole die forging flange valve, particularly relate to a kind of die-forging forming processing process for forging of integral (type) flange valve.
Background technology:
Existing valve body die-forging forming method all is to take unidirectional contour forging technique, take blanking successively, blocking, finish-forging, side cut process, blocking after the blanking is the workpiece maximum outside diameter cylindricality suitable with length that bar is earnestly become external diameter and length and will process, and is put into up and down to carry out unidirectional die forging finish forging between the mould again.Blocking is just in order to change the performance of material.The unidirectional die forging process of finish-forging.Because unidirectional die forging is single load bearing downwards above mould up and down only, so can only process a direction or the smaller workpiece of position proportion of deformation.The die forging of the valve body of forged steel flange valve, valve manufacturer is because the contour forging technique condition of being heated is limit both at home and abroad for a long time, and the valve body of flange valve takes the valve body main body to forge the welding of processing back respectively with flange always.When manufacturing and designing U.S. API602 " compact forged steel valve " standard and Chinese JB/T7746 " undergauge forged steel valve " standard valve product, valve body three directions above dual-side portion and middle part all have flange, and flange and adjacent regions ratio differ bigger, so valve body processing technology of die forging flange valve, can only adopt domestic and international valve manufacturer to adopt the flange and the die forging respectively of valve body main part on both sides for a long time, the technology that welds together again, form the Welding Structure flange valve, as shown in Figure 2.The flange valve structure that this technology forms owing to weld the weld corrosion hidden danger of bringing, has reduced the intensity of valve body, has increased the nondestructive inspection operation.Welded flange valve production technology: [the valve body main body is forged, machined; The forging of two side flanges, machined] → [weldering front valve shell, flange The pre-heat treatment] → [welding of two side flange valve bodies] → [heat treatment elimination thermal stress] → [weld seam x-ray detection, dye-penetrant inspection] → [fine finishining] → [the assembling pressure testing is dispatched from the factory].
As take the valve body of whole die forging, can adopt multidirectional contour forging technique and mould, such mould design is complicated, cost is high, design forging equipment separately, forging equipment cost height, processing technology more complicated, and complicated operation, manufacturing cost are than higher.The inflammable and explosive high-temperature high pressure valve that domestic and international petrochemical enterprise is adopted requires very strict to valve body, because the casting defect that cast steel, cast iron valve caused, user and manufacturer adopted the forged steel structure valve in a large number in recent years, the strong valve FMT that promotes develops, the country that the world is the most flourishing has adopted 3 ton forging presses, three-dimensional die forging technology is forged large-scale or complex valve forging as shown in Figure 4.At present, the valve industry adopts three kinds of forms to DN≤50mm API swaged forging steel valve both at home and abroad, Fig. 3-1 is threaded, socket weld connection layout 3-2, welded flange valve Fig. 3-3, adopt screw thread common valve body of socket weld form and flange welding for the welded flange valve both at home and abroad, and common valve body forges the common forging equipment of employing; Pressure 400T, 460T, 1600T, 3150T, unidirectional die forging technology.
Summary of the invention:
The present invention will solve existing die forging processing flange valve to want problem that the split die forging welds again and whole die forging cost height, technology and pattern assembly equipment complicated technology problem, provide a kind of easy to operate, cost is low, utilizes the complex-shaped integral (type) flange valve die forging technological method for processing of single way stempressing equipment and mold processing structure.
The present invention adopts common forging equipment, and unidirectional die forging technology (referring to as shown in Figure 5) is forged whole die forging flange valve blank.Integrated die forge forming method for flange valve of the present invention, be to take blanking, blocking, finish-forging, side cut successively, it is characterized in that: carry out blocking shape blank just after the blanking, be that the material external diameter is swaged into external diameter greater than valve body dual-side flange in advance, again the middle part is flattened, thickness after flatten at the middle part is greater than the external diameter of flange in the valve body, make the first shape blank (be called base) of length greater than valve body dual-side flange direction length, first shape blank behind the base is put into the finish-forging that carries out unidirectional die forging in the upper and lower mould, cuts edge behind the finish-forging.Further for small-bore flange valve since in the limit flange of the both sides distance flange more approaching, for flowing to two approaching flange positions fully simultaneously to the die forging process surplus, bonding discharges waste material, between limit flange and middle flange, leave the gap up and down between the die edge, unidirectional die forging process guarantees surplus effectively to adjacent limit flange and two flange positions of middle flange and Clearance Flow, helps the next procedure shaving die and cuts edge.In producing stainless valve or method with respect to the whole die forging flange of the heavy caliber valve body of press tonnage, also to behind blocking, carry out the thick finish-forging of unidirectional die forging to first shape blank with the mould up and down of thick finish-forging, and excise burr behind the thick finish-forging, carry out the smart finish-forging of unidirectional die forging again with the mould up and down of smart finish-forging, the shaping of cutting edge behind the smart finish-forging.
This invention only uses the common uniaxial pressure machine just can processing integral (type) flange valve blank, can adopt the 400T-3000T forcing press respectively less than 50mm forged steel valve, the whole valve body of unidirectional die forging, forging and pressing API602 standard carbon steel, steel alloy, stainless steel integrated die forging flange valve.The die forging flange integral body that the whole die forging flange of the present invention valve adopts.From the present invention and existing flange valve manufacturing process, form whole die forging flange valve and simplify the weld preheating that brings owing to welding greatly, operations such as post weld heat treatment, welding nondestructive testing, shortened the manufacturing cycle, reduce hot-working man-hour and expensive Non-Destructive Testing expense, fundamentally eliminated the potential safety hazard that weld seam brings.Compare with multidirectional contour forging technique and mould, simplified the mould design greatly, greatly reduce die cost, need not design forging equipment separately, reduced the forging equipment cost, simplified processing technology and operating process, greatly reduced processing cost.
Description of drawings:
Fig. 1 is the sectional structure schematic diagram that adopts the integral (type) flange valve of die forging technology manufacturing of the present invention.
Fig. 2 adopts the flange of the forged steel valve body that has the manufacturing of split die forging technology and the welded flange valve sectional structure schematic diagram that the valve body main body welds together.
Fig. 3-the 1st, the valve body sectional structure chart of existing internal thread valve (not with two side flanges);
Fig. 3-the 2nd, the valve body sectional structure chart of existing socket weld valve (not with two side flanges);
Fig. 3-the 3rd, the valve body sectional structure chart of existing flange valve (flange and valve body welding).
Fig. 4 is a three-dimensional die forging schematic diagram; Fig. 5 is unidirectional die forging schematic diagram.
Fig. 6 is socket welding flange valve main body (the not containing the dual-side flange) schematic diagram that the unidirectional die forging of prior art goes out; Fig. 7 is the integral (type) flange valve schematic diagram that explained hereafter of the present invention goes out; Fig. 8 is small-bore (light-duty) integral (type) flange valve schematic diagram that explained hereafter of the present invention goes out.
Fig. 9 is the schematic diagram of each process moulding of existing unidirectional contour forging technique processing flange valve main body (not containing the dual-side flange), wherein the bar of 9-1 blanking, 9-2 are the honest thick shapes of blocking, 9-3 is the valve body main body front schematic view behind the unidirectional die forging finish-forging of upper and lower mould, 9-4 is the valve body main body left side schematic diagram behind the unidirectional die forging finish-forging of upper and lower mould, 9-5 is the valve body main body front schematic view after cutting edge, and 9-6 is the valve body main body left side schematic diagram after cutting edge.
Figure 10 is the schematic diagram of each process moulding of process processing integral (type) flange valve of the present invention, wherein the bar of 10-1 blanking, 10-2 are that honest thick shape, the 10-3 of blocking is that just to forge shape front view, 10-4 after flatten at the middle part be that just to forge shape left view, 10-5 after flatten at the middle part be whole valve body front schematic view behind the unidirectional die forging finish-forging of upper and lower mould (or thick finish-forging), and 10-6 is the whole valve body left side schematic diagram behind the unidirectional die forging finish-forging of upper and lower mould (or thick finish-forging).Whole valve body front schematic view behind the smart finish-forging of the unidirectional die forging of 10-7 upper and lower mould, 10-8 is the whole valve body left side schematic diagram behind the smart finish-forging of the unidirectional die forging of upper and lower mould.Whole valve body front schematic view after the 10-9 finish-forging is cut edge again, 10-10 is the whole valve body left side schematic diagram after finish-forging is cut edge again.Further specify technology solid forging flange valve valve body of the present invention (containing the dual side-edge flange) technology below in conjunction with example and accompanying drawing.
The specific embodiment:
Common valve chaeta base (not containing the dual side-edge flange) is called " racemosus type " forging (as shown in Figure 6), die forging is just relatively more difficult, and integral (type) flange valve blank is called " branch's racemosus shape " forging, complex-shaped coefficient is called as complex levels, therefore adopts existing valve body Forging Technology process (process as shown in Figure 9) to realize.The zone that dual-side flange and middle flange form shown in Fig. 7,8, a, b, c, d place three-dimensional are pushed side crops and can't be got rid of, and cause foldingly, and expander or mould body cavity forge discontented.The both sides flange thickness surpasses the complex-shaped coefficient requirement of forging with the ratio of forging thickness, adopts existing unidirectional die forging technical difficulty very big.
Embodiment one, a kind of integrated die forge forming method for flange valve of the present invention are to take according to valve body materials and surplus blanking equally; The bar (10-1 among Figure 10) that goes out is down carried out blocking shape blank just, before this bar external diameter φ blocking (honest one-tenth) φ 1 (φ 2) was become greater than valve body dual-side flange outer diameter shape (10-2 among Figure 10), again the middle part is flattened, the thickness b1 that flatten at the middle part is greater than the external diameter of flange in the valve body, make length L 2 (L1 becomes L2) and (abbreviate base as greater than the first shape blank of valve body dual-side flange direction length, see the 10-3 among Figure 10,10-4), first shape blank is put into, carry out the finish-forging (10-5 among Figure 10 of unidirectional die forging in the counterdie, 10-6), cut edge behind the finish-forging and form the integral (type) flange valve and (see the 10-9 among Figure 10,10-10).Valve body for small-bore flange valve, because flange is relatively near (see figure 8) in the limit flange distance on both sides, for bonding flows to two approaching flange positions fully simultaneously to the die forging process surplus, and discharge waste material (seeing the A among Fig. 8), leaving gap value up and down between the die edge between the flange in length and breadth, unidirectional die forging process guarantees that surplus is effectively fully mobile to adjacent two flange positions in length and breadth, helps the next procedure shaving die and cuts edge.The round steel blank size will satisfy an actor's rendering of an operatic tune and overlap amount, and the too for a short time body cavity that is not fully filled of blank size is crossed very much not moulding, the mold damage waste material.
Embodiment two, a kind of small-bore or light integral flange valve valve body die forging forging molding process method: carry out blocking after the blanking, be that the bar external diameter is swaged into external diameter greater than valve body dual-side flange in advance, again the middle part is flattened, the thickness that flatten at the middle part is made the first shape blank (be called base) of length greater than valve body dual-side flange direction length greater than the external diameter of flange in the valve body; Small-bore flange valve is owing to flange in the flange distance of both sides is more approaching, leaving gap value up and down between the die edge between the flange in length and breadth, blank behind the base is put into the finish-forging that carries out unidirectional die forging in the upper and lower mould, unidirectional die forging process guarantees that surplus is effectively fully mobile to adjacent two flange positions in length and breadth, cuts edge behind the finish-forging.
The present invention is that flange is the Forging Technology needs with two side flange inner spaces according to the different additional different-thickness gussets of thickness, this gusset in valve body, the producer can or keep by cold process means excision under the condition of meeting design requirement, thereby satisfies the Forging Technology requirement.
Embodiment three, a kind of austenitic stainless steel integral (type) flange valve die forging forging molding process method of the present invention.
In producing stainless valve or method with respect to the whole die forging flange of the heavy caliber valve body of press tonnage, also to behind blocking, carry out the thick finish-forging of unidirectional die forging to blank with the mould up and down of thick finish-forging, and excise burr behind the thick finish-forging, carry out the smart finish-forging of unidirectional die forging again, the shaping of cutting edge behind the smart finish-forging.Austenitic stainless steel is owing to be subjected to thermal conductivity factor, forging temperature, its plasticity of condition restriction such as material deformation drag (sclerosis tendentiousness) plasticity is low are minimum, the high temperature deformation drag of stainless steel forgings is big, same identical forging of weight shape of common valve body forging, forge stainless bang number of times and increase by 50% than carbon steel, the forging die life-span is a carbon steel 1/5, different classes of stainless steel difference is bigger, main is closely related with the size and the complexity of forging, and the common stainless steel forging process for fuel also is very difficult.
Austenitic stainless steel of the present invention forges and presses the whole die forging flange of different size austenitic stainless steel valve blank to whole die forging valve flanges valve, the unidirectional die forging technology of employing ordinary press,
Concrete technology is as follows:
1) blanking
Blank size will satisfy die cavity and slitter edge amount, blank size is too little, is not fully filled body cavity, crosses very much not moulding mold damage, waste material.
2) first blocking
Blocking will satisfy dual side-edge flange blocking amount with the honest thick φ 1 (long L1) of the bar φ (long L) of blanking, and φ 1 is greater than valve body dual-side flange outer diameter, and L1 will satisfy valve body blocking amount.
3) forge shape base just in advance: the middle part is flattened, the thickness b1 that flatten at the middle part makes the first shape blank of length L 2 greater than valve body dual-side flange direction length greater than the external diameter of flange in the valve body again.
The size of L2, φ 2, b1 base is the key of integral (type) flange valve moulding, is the critical process parameter of control.The size of H guarantees valve body height blocking amount.
4) thick finish-forging
In view of the thick finish-forging that increases the blocking step and carry out unidirectional die forging with mould about the thick finish-forging folding or seminess appear, in the difficult overload of stainless steel special material resistance of deformation large deformation.During thick finish-forging, valve body blocking thickness＞valve body blank actual (real) thickness, its magnitude of interference is formulated corresponding process by different bore valve bodies.
5) cut edge
The slitter edge (referring to the 10-5 among Figure 10,10-6) that thick finish-forging produces carries out the side cut first time and forms whole die forging flange valve type just.
6) smart finish-forging
Mould final molding (referring to the 10-7 among Figure 10,10-8) about just the whole die forging valve body blank of finish-forging and trimming for forming enters smart finish-forging.
7) side cut finishing
Excise unnecessary slitter edge finishing moulding (referring to the 10-9 among Figure 10,10-10).
The rough forging of whole die forging flange valve, adopt Forging Technology of the present invention, improve the blocking operation, increase preforming and finish-forging (thick finish-forging and smart finish-forging) operation, according to the blank shape coefficient, material deformation coefficient difference, corresponding finish-forging (thick finish-forging), the finish forge operation can be given up and be got, utilize common forging equipment, single-phase die forging technology is forged " branch racemosus type " complex forging, adopting new Forging Technology technology must verify repeatedly simultaneously, forms whole die forging flange valve blank smithing technological parameter.Thick blocking, circular diameter size satisfy two side flange blocking amounts, length satisfies valve body blocking amount, the size of base b1 guarantees valve body width blocking amount, the size of H guarantees valve body height blocking amount, finally being based upon the precision control of blocking base, is the key (referring to the 10-3 among Figure 10,10-4) of finish forge moulding.
Claims (3)
1. integrated die forge forming method for flange valve, be to take blanking successively, blocking, finish-forging, side cut, it is characterized in that: carry out blocking shape blank just after the blanking, be that the material external diameter is swaged into external diameter greater than valve body dual-side flange in advance, again the middle part is flattened, thickness after flatten at the middle part is greater than the external diameter of flange in the valve body, make the first shape blank of length greater than valve body dual-side flange direction length, first shape blank is put into the finish-forging that carries out unidirectional die forging in the upper and lower mould, cuts edge behind the finish-forging.
2. as the said integrated die forge forming method for flange valve of claim 1, it is characterized in that: leave the gap up and down between the die edge between limit flange and middle flange, unidirectional die forging process surplus is to adjacent limit flange and middle flange position and the Clearance Flow between the die edge up and down.
3. as the said integrated die forge forming method for flange valve of claim 1, it is characterized in that: the thick finish-forging that behind blocking, first shape blank is carried out unidirectional die forging with the mould up and down of thick finish-forging, and excise burr behind the thick finish-forging, carry out the smart finish-forging of unidirectional die forging again with the mould up and down of smart finish-forging, the shaping of cutting edge behind the smart finish-forging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100467033A CN100402184C (en) | 2006-05-22 | 2006-05-22 | Integrated die forge forming method for flange valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100467033A CN100402184C (en) | 2006-05-22 | 2006-05-22 | Integrated die forge forming method for flange valve |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2008101286369A Division CN100567786C (en) | 2006-05-22 | 2006-05-22 | Integral (type) flange valve and valve body and die-forging forming method |
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| CN1981952A CN1981952A (en) | 2007-06-20 |
| CN100402184C true CN100402184C (en) | 2008-07-16 |
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| CNB2006100467033A Expired - Fee Related CN100402184C (en) | 2006-05-22 | 2006-05-22 | Integrated die forge forming method for flange valve |
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| CN112719201B (en) * | 2020-12-02 | 2022-09-23 | 浙江欧伦泰防火设备有限公司 | Valve forging and pressing process |
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