Super-huge thick wall head forging rotary rolling manufacturing process and forming device
The present invention relates to end socket forging manufacturing process, especially a kind of super-huge thick wall head forging rotary rolling at
Shape method and forming device.
With Nuclear Power Industry, the development of petrochemical industry, the operating temperature range of pressure vessel is more and more wider, and container dimensional is set
Increasing, performance requirement continuous improvement is counted, shape is increasingly complex.Super-huge thick wall head refers generally to diameter and is greater than 3m or more,
Wall thickness reaches the end socket of 150mm.In order to guarantee safety, meet higher technical requirements, the manufacturing technology of many large-sized end enclosures changes
For solid forging, instead of original welding, cast form.The forming mode of usual end socket has integral spinning forming and slab drawing
Forming.Whole rotary press modelling is suitable only for simple shape, thin-walled, and the end socket without regular shapes such as ozzle, boss.Slab drawing at
It is larger that the method for shape can be used for forging wall thickness, simple shape and symmetrical end socket.But it is especially big for diameter, wall thickness, and have
The especially big special-shaped heavy wall class end socket of the special constructions such as ozzle, boss, flange, is often restricted by structure snd size, required load
Also above the existing weaponry and equipment limit, above two method cannot be used to be manufactured.Generally use local upper mold rotary forming method
Manufacture especially big special-shaped heavy wall class end socket.The manufacturing method is put into designed mold first by steel ingot cogging, then by steel ingot, so
Forging shapes in such a way that local upper mold carries out circulation rotating spreading afterwards, finally obtains finished product forging using machining.Although
Have part wall thickness thicker, the less complicated end socket of shape can the forging using slab drawing and forming by the way of, but part upper mold
The method of rotary rolling, which is omitted, prepares this process of slab, therefore production efficiency greatly improves.
The process flow of especially big abnormity heavy wall class end socket forging is general are as follows: rotation is rolled in jumping-up → mould in steel ingot base → mould
Pressure → go out finished product.The difficult point of whole process is rotary rolling process in mould.In this process, forging is placed in mold, is belonged to
Constrained reshaping, required load are very big.It according to existing capacity of equipment, can only push, then rotate using bar shaped anvil part is a small amount of
Certain angle is increased drafts after completing a circle, is started new rotating down pressing cycle period, directly with the pushing of identical drafts
To product shaping.This operating method is rotary rolling forming process.
General upper mold rotary rolling forming process cloth anvil is as illustrated in fig. 1 and 2.The upper mold of rotary rolling is generally bar shaped,
Working face is mainly designed as the local anvil of width suitable with the shape according to product profile.Upper mold is according to clockwise or counterclockwise one
It is pushed after fixed angle, i.e., according to the sequence spreading of A, B, C ... X shown in Fig. 2, the arc length rotated each time and upper mold width
It is almost the same, to ensure that entire inner surface can uniform spreading.Upper mold two sides are straight, with working face junction rounding.But
Due to the intrinsic limitation of this technology, during rotary rolling, end socket inner surface will form a large amount of injureds.Through multi-pass
After rotating down pressing, injured falls into forging body entrainment of oxide skin, or even influences workpiece body size, and there are larger quality is hidden
Suffer from.To improve forging quality, traditional forming mode need to increase inner wall surplus, and to process removal injured part, this is just led
Cause the following process period long, cost rises with it.
Summary of the invention
Technical problem to be solved by the invention is to provide one kind it is possible to prevente effectively from forging inner surface injured it is super-huge
Thick wall head forging rotary rolling manufacturing process and forming device.
Super-huge thick wall head forging rotary rolling manufacturing process disclosed by the invention,
Forging is placed in lower die, the period is divided to carry out rotary rolling shaping operation, each rotary rolling period is divided into two
Circle, two circle upper mold depressed positions are mutually staggered, and the angle of first lap upper mold adjacent pushing twice is γ, and θ < γ≤2 θ, and second
The angle of circle adjacent pushing twice is similarly γ, the non-spreading region spreading of first lap is completed, a cycle mould pressing is completed
The rotary rolling of next cycle is carried out again afterwards, until finished product out；
The upper mold is bar shaped anvil, the θ indicate upper mold working face two sides to the angle of upper mold centre rotational axis.
Preferably, in each rotary rolling period, angle γ=2 θ of first lap upper mold adjacent pushing twice, the second circle the
Primary push is staggered with first lap last time pushing, and wrong beak iron degree is θ, and the rotation of the second circle is carried out according still further to the rotation angle of 2 θ
Turn spreading, the rotary rolling until completing a cycle.
Preferably, upper mold volume under pressure control each time is within 100 ㎜.
Super-huge thick wall head forging rotary rolling forming device disclosed by the invention, including upper mold, upper mold rotating seat,
Lower die and pedestal, the lower die are set on pedestal, and the upper mold rotating seat is set to above pedestal, and the upper mold is connected to
Mould rotating seat bottom, the upper mold include top surface, working face and two sides, and the working face and two sides use chamfered transition,
Two sides chamfer angle is respectively 20 °≤α≤70 °, and 20 °≤β≤70 °, in the ㎜ of 100 ㎜~200 between the side length of chamfering both sides.
Preferably, the chamfering of the working face two sides presses arrangement substantially symmetrical about its central axis, and symmetrical centre is upper mold centre rotational axis,
It is greater than the chamfered part backwards to direction of advance in the chamfered part of rotary rolling direction of advance.
Preferably, the width of the upper mold is L, and the ㎜ of 600 ㎜≤L≤900.
The beneficial effects of the present invention are:
(1) the rotary rolling device in the present invention is not necessarily to change tooling other than upper mold, newly-designed upper mold simple shape,
Easy to manufacture, input cost is low；
(2) rotary rolling mode of operation of the invention, operating process is simple, and the large area that can effectively reduce injured goes out
It is existing, and forging surplus can be reduced, improve steel ingot utilization rate；
(3) forging using the present invention compared to the production of general rotary rolling forming process, subsequent mechanical machining allowance is less,
Overall production efficiency is higher；
Detailed description of the invention
Fig. 1 is the schematic device of upper mold rotary forming method；
Fig. 2 is the cloth anvil schematic diagram of traditional upper mold rotary forming method；
Fig. 3 is cloth anvil schematic diagram of the invention；
Fig. 4 is the main view of upper mold of the invention；
Fig. 5 is the top view of upper mold of the invention；
Fig. 6 is the side view of upper mold of the invention.
Appended drawing reference: upper mold 1, lower die 2, pedestal 3.
The present invention is further described below.
The process flow for manufacturing super-huge thick wall head forging using method of the invention is roughly the same with traditional handicraft:
Rotary rolling in jumping-up → mould in steel ingot base → mould → go out finished product, the present invention is primarily directed to this technique of rotary rolling in mould
Step is improved, and this method is placed in forging in lower die 2, and the period is divided to carry out rotary rolling shaping operation, Mei Yixuan
Turning the spreading period is divided into two circles, and two circle 1 depressed positions of upper mold are mutually staggered, and after the completion of first lap spreading, can leave and multiple is in
The non-spreading region of triangle, due to the interval in these non-spreading regions, this circle does not have injured part and enters forging sheet by spreading
Body, the angle of the adjacent pushing twice of first lap upper mold 1 are γ, and the θ < θ of γ≤2, during the second circle spreading, each triangle
Non- spreading region can disposably be covered by upper mold 1 completely, during second rolling, second circle it is adjacent twice under
The angle of pressure is similarly γ, non-spreading part will spreading, since non-spreading region two sides are spreading regions, by the object of spreading
Matter can be flowed towards two sides, therefore do not had injured part equally and entered forging body by spreading, the second circle adjacent pushing twice
Angle is similarly γ, in this way, the second circle completes the non-spreading region spreading of first lap, i.e., as shown in figure 3, first lap by A in figure,
A, A ... X carries out spreading, and the second circle carries out spreading by B, B, B ... Y in figure, it is ensured that and two circle depressed positions are mutually staggered, and one
The rotary rolling of next cycle is carried out after the completion of period mould pressing again, until finished product out, the upper mold 1 is bar shaped anvil, institute
State θ indicate 1 working face two sides of upper mold to the angle of 1 centre rotational axis of upper mold.The method can avoid the occurrence of traditional handicraft
The large area injured of middle appearance, injured are limited in bottom buildup area, will not impact to product ontology.This rotary rolling control
Method processed efficiently reduces forging surplus, improves steel ingot utilization rate, and following process surplus is also greatly reduced, and production cost is therewith
To improve spreading efficiency to greatest extent, in each rotary rolling period, the adjacent pushing twice of first lap upper mold 1
The θ of angle γ=2, the second circle are pushed to push with first lap last time for the first time and be staggered, and wrong beak iron degree is θ, according still further to the rotation of 2 θ
Gyration carries out the rotary rolling of the second circle, the rotary rolling until completing a cycle.In this way, remaining after first lap do not roll over
Intermediate pressure section just can be by the second complete spreading of circle.Volume under pressure is excessive to be also easy to produce injured, therefore the volume under pressure each time of upper mold 1
It preferably controls within 100 ㎜.
In order to further prevent that forging is made to form injured using above-mentioned spreading method, the present invention also specially devises one thus
The super-huge thick wall head forging rotary rolling forming device of kind, which includes upper mold 1,1 rotating seat of upper mold, lower die 2 and bottom
Seat 3, the lower die 2 is set on pedestal 3, and 1 rotating seat of upper mold is set to 3 top of pedestal, and the upper mold 1 is connected to upper mold
1 rotating seat bottom, the upper mold 1 include top surface, working face and two sides, and top surface has dovetail design, for rotating with upper mold 1
Seat is connected.Working face two sides are the conical surface or spherical surface, end face diameter φ.1 width of upper mold is L, the ㎜ of usual 600 ㎜≤L≤900.
The working face and two sides use chamfered transition, chamfer angle (i.e. the angle of chamfering and perpendicular) be respectively 20 °≤α≤
70 °, 20 °≤β≤70 °, in the ㎜ of 100 ㎜~200 between the side length of chamfering both sides.Wherein, the working face of upper mold 1 is upper compared to traditional
Mould 1 has bigger chamfering, can be effectively prevented and generates injured at the non-spreading region of the second circle spreading first lap.Two sides chamfering
Angle can be equal or unequal, but must press arrangement substantially symmetrical about its central axis, and symmetrical centre is 1 centre rotational axis of upper mold, bottom
Chamfering contends gradual transition according to leaning now to one side, then to the other.During first lap spreading, there are triangles for meeting between the adjacent pushing twice of upper mold
Non- spreading region, and its section is that perhaps the trapezoidal optimal shape in the section is isosceles triangle or isosceles to triangle
It is trapezoidal, in this way, the injured least easy to form during the second circle spreading.But if the chamfering of upper mold two sides is identical, first
It encloses during adjacent spreading twice, rear primary spreading can squeeze the direction of a blank spreading forward, so that rolling over twice
Non- spreading regional cross section between pressure becomes the non-isosceles triangle for being biased to a preceding spreading region, therefore, it is preferred that,
It is greater than the chamfered part backwards to direction of advance in the chamfered part of rotary rolling direction of advance.In this way, being formed not after first lap
Spreading regional cross section can prevent from causing injured during the second circle spreading more close to isosceles triangle or isosceles trapezoid.