CN1120984A - Pumping-rod forging process and the die thereof - Google Patents

Abstract

The present invention relates to a forging press process, which is esp suitable for moulding pumping rod and similar long rod. The conical cavity of terrace die used in material collection has a large- end taper greater than 2 deg and a cylinder small end. The male and female dies have their die-parting faces in the same plane and the stock interfaces in die cavity are in the same plane except in a few of processes. The present invention can greatly raise the finished product rate.

Description

Sucker rod forging and forming technology and mould thereof

The present invention relates to a kind of Forging Technology, be specially adapted to sucker rod forging and forming technology and mould thereof, also be applicable to the making of similar long pole.

The sucker rod forging and molding relates to the upsetting technology of long pole, works out long pole upsetting technology.Follow " taper forging die upsetting rule " at present both at home and abroad, the fifties, The former Russian scholar А. л. Т о m л e н о в works out the rammer limit alpha (Fig. 1) of draw ratio ψ≤9 by experiment, for ψ ₀＜9 o'clock, think that should satisfying rammer contracts than β＜3, thereby adopted a horizontal constraints curve, the eighties, The former Russian scholar Е. И. people such as С e м e н о в are to ψ ₀＜7 lead and the experimental study of aluminium base, though drawn the Е as a result that exceeds restrictive curve α (Fig. 1). И. С e м л e н о в, И. С. З а н о ъ e в, Р а с ч т Л в а р а т л ь н о и в ы с а я ю и в к о н и ч e с н e с к о м л у а н с о н e ш р и ш т а м п о к e н а ш а ш и н о с т р о ш н а л ь н о к о в о ч н ы Х ш а ш и н я Х, ш а ш и н о с т о р о e н а я, 1981.NO.6.C.50-51.But still unresolved ψ ₀＞9 upsetting limit problem, for example its draw ratio of sucker rod forging CYG φ 16mm ψ ₀=18.13, can't use existing " conical die upsetting rule ", thereby many countries are when sucker rod Forging Technology and mould design thereof, add the experience design with reference to above-mentioned rule, on horizontal forging and upsetting machine during upsetting, upsetting is under the astable condition, often produce folding because of axial unstability, defectives such as misrun cause percent defective up to more than 20%, the cost height, work efficiency is low, in China, annual need sucker rod 2500～3000 myriametres (about 312～3,700,000) if with percent defective 20% with on calculate that its waste is quite serious.

At the shortcoming that above-mentioned prior art exists, the present invention discloses a kind of forging and forming technology and mould thereof that is applicable to the big L/D ratio sucker rod.

The present invention puts forward on following experimental basis, and succeeds in practice.To draw ratio ψ ₀=10-20 aluminium base, under 4-1.06 situation of impression coefficient of unfullness μ=1.04-1.06, carry out upending test, special to restrictive curve n (Fig. 1), through revise practical curve m (Fig. 1), thus, the present invention implements by the following technical programs: (one) sucker rod forging and molding is carried out on horizontal forging and upsetting machine (Fig. 2) by six work steps such as three poly-material work steps, preform work step, shaping work steps and the typewriting work steps of cutting edge.Described first work step (Fig. 2 (1)) is poly-material work step, and this work step jumping-up deflection is β ₁, it is greater than the second work step jumping-up deflection β ₂, i.e. β ₁＞β ₂The big end in the punch of this work step awl chamber increases cone angle＞2 °, this prevents to produce radially, and overlap folds with forming, awl chamber small end is one section cylindrical cavity, to improve blank deformation stability, the impression roughness reduces to the shaping work step gradually from first work step, and the roughness of this work step is that 12.5-6.3 described second work steps (Fig. 2 (2)) are poly-material work step, this work step jumping-up deflection β ₂＞β ₃, the big end in the punch of this work step awl chamber increases cone angle＞2 °, and to prevent to produce radially overlap and to form foldingly, awl chamber small end is that one section cylindrical cavity is to improve blank deformation stability, roughness 6.3-3.2; Described the 3rd work step (Fig. 2 (3)) is poly-material work step, this work step jumping-up deflection β ₃＞β ₄, the big end in the punch of this work step awl chamber increase cone angle＞2 ° with prevent radially overlap and form folding, roughness 3.2-1.6.

(2) mould (Fig. 3) that is complementary with above-mentioned sucker rod forging and forming technology is, it is used for forging on the horizontal forging and upsetting machine sucker rod, it is by punch, punch holder, screw, die, clamping die, set upright mould, typewriting mould, grip slide are formed, the punch-die die joint of each poly-material work step is in same plane F, blank at impression internal strain and indeformable interface in each work step except that cut edge, the typewriting work step all in same plane E, be convenient to operation and realize the automatic cut-to-length feeding.Poly-material work step is established punch awl chamber, its big end increases cone angle＞2 °, poly-material work step punch awl chamber small end is established one section cylindrical cavity, punch 16,17,18,19,20,21 is fixed on the punch holder 22 by screw, die 1,3,5,7,9,12 and clamp die 2,4,6,8,10, set upright mould 13, typewriting mould 14 is fixed on the grip slide 15 by screw.

Advantage of the present invention: (one) this technology can rationally be determined each work step forging deflection; (2) poly-material work step is established punch awl chamber, its small end is established a cylindrical cavity, to improve the stability of blank deformation, reduce upsetting variable amount, awl chamber big end is established a cone angle＞2 °, can prevent that blank from producing radially overlap, folding, and can make each work step deflection enough big and don't as for the excessive buckling of generation.(3) blank at die cavity internal strain and indeformable interface in each work step except that the typewriting work step of cutting edge all in same plane, be convenient to realize the automatic cut-to-length feeding, easy to operate; (4) mould structure is reasonable, and processing is simple, adopts technology of the present invention and mould can make sucker rod forge yield rate and is brought up to more than 95% by average 70% of the past, and forging quality reaches API standard and GB GB7229-87 comprehensively.

Description of drawings is as follows:

Accompanying drawing 1. taper impression size limits

Accompanying drawing 2. sucker rod Forging Technology figure

Accompanying drawing 3. mould structure schematic diagrams

Below with sucker rod CYG

16mm is that example is described as follows its Forging Technology:

First work step: the blank that heats is placed on the clamping die 2, during grip slide 15 closures, blank is clamped, when punch binding clasp 22 travelled forward, 16 pairs of blanks of taper punch of fixing on it carried out upsetting; Blank is after upsetting is finished in the 16 awl chamber internal strains of die 1 and punch, punch holder 22 returns drive punch 16 and return, finish demoulding, grip slide unclamps, and for preventing to produce radially overlap, increases cone angle at distance die joint 35mm place and makes α＞2 ° 30 ' simultaneously, in order to reduce to be out of shape the relative length of blank, and the backstroke (30mm is for 250～500T horizontal forging and upsetting machine) of consideration grip slide master slider under closure state, make in the little bottom of punch impression

${16.5}_{+0.1}^{+0.2}\×28\mathrm{mm}$ The garden cylinder chamber.

Second work step: blank is placed on the clamping die 4, grip slide 15 closures clamp blank, punch holder 22 drives the punch of fixing on it 17 and travels forward, blank is carried out upsetting, blank is in die 3 and punch 17 impression internal strains, after this, and punch holder 22 returns, the punch 17 and the blank demoulding, grip slide 15 unclamps.

The 3rd work step: the blank after second work step is forged places on the clamping die 6, grip slide 15 closures clamp blank, punch holder 22 drives the punch of fixing on it 18 and travels forward, and blank is carried out upsetting, and blank is in die 5 and punch 18 impression internal strains, after this, punch holder 22 returns, the punch 18 and the blank demoulding, grip slide 15 unclamps, in continuous work step down, produce foldingly for avoiding producing radially overlap, stay the 3mm gap between punch 18 and the die 5.

The 4th work step: blank is placed on the clamping die 8, grip slide applies active force by die 7 and gives blank, make cross section, garden blank become the forging of square section, punch holder 22 drives the punch of fixing on it 19 and travels forward, when die 7 is rectangular, blank is imposed axial forging squeeze, with the deficiency of compensation blank side distortion.After this, punch holder 22 drives punch 19 returns, finishes the demoulding, and grip slide 15 unclamps, and takes out blank.

The 5th work step: the 4th work step is given blank after rectangular does not have axially that half-twist places on the die 9, during grip slide 15 closures, by clamping die 10 blank is clamped, simultaneously, 9 pairs of blanks of die are further rectangular, punch holder 22 moves forward, drive is fixed 20 pairs of blanks of punch on it and is imposed axial forging and squeeze, quadrate part is full of well, simultaneously big flange place upsetting extrusion, unnecessary metal forms radially overlap between punch 20 and die 9, and punch holder 22 drives punch 20 returns, finish the demoulding, grip slide 15 unclamps.

The 6th work step: cut edge, typewrite, the indeformable bar of forging is deployed in setting upright on the mould 13, head places on the trim die 12, during punch 21 reach, the radially overlap at big flange place is cut away, punch 21 is during with the punch holder return, and the overlap woolen cloth is by unloading overlap device 11 removals.This forging that removes behind the burr is moved after axially, quadrate part is placed on the typewriting mould 14, when grip slide was closed, the typewriting mould applied active force at the forging quadrate part, finishes typewriting.

Claims (2)

1. shafting oil bar forging and forming technology, it is carried out on the hand forging machine by six work steps such as three poly-material work steps, preform work step, shaping work steps and the typewriting work steps of cutting edge, it is characterized by first work step and is poly-material work step, and it is β that this work step is forged thick deflection ₁, it forges jumping-up deflection β greater than second work step ₂, i.e. β ₁＞β ₂, the big end in protruding film awl chamber of this work step increases cone angle＞2 °, and awl chamber small end is one section cylindrical cavity, and the impression roughness is that 12.5-6.3, the second work step is poly-material work step, this work step jumping-up deflection β ₂＞β ₃, the big end in the punch of this work step awl chamber increases cone angle＞2 °, and awl chamber small end is one section cylindrical cavity, and the impression roughness is that the 6.3-3.2, the 3rd work step is poly-material work step, this work step jumping-up deflection β ₃＞β ₄, the big end in the punch of this work step awl chamber increases cone angle＞2 °, roughness 3.2-1.6.

2. according to the mould of the described sucker rod forging and forming technology of claim, it is by punch, punch holder, screw, die, clamp recessed film, set upright mould, the typewriting mould, grip slide is formed, the punch-die die joint that it is characterized by each poly-material work step is in same plane (F), blank removes side cut in impression internal strain and indeformable interface in each work step, the typewriting work step is outward all in same plane (E), the big end in punch awl chamber of poly-material work step increases cone angle＞2 °, poly-material work step punch awl chamber small end is established one section cylindrical cavity, protruding film (16), (17), (18), (19), (20), (21) be fixed on the punch holder (22) die (1) by screw, (3), (5), (7), (9), (12) and clamp die (2), (4), (6), (8), (10), set upright mould (13), typewriting mould (14) is fixed on the grip slide (15) by screw.

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