CN101574721A

CN101574721A - Once hot-forging shaping process for manufacturing joint hinge

Info

Publication number: CN101574721A
Application number: CNA2009100527818A
Authority: CN
Inventors: 周菊明
Original assignee: SHANGHAI CHANGQIANG POWER STATION FITTINGS CO Ltd
Current assignee: Shanghai Chang Qiang industrial Polytron Technologies Inc
Priority date: 2009-06-09
Filing date: 2009-06-09
Publication date: 2009-11-11
Anticipated expiration: 2029-06-09
Also published as: WO2010142069A1; CN101574721B

Abstract

The invention relates to the technical field of joint hinge manufacturing, in particular to a once hot-forging shaping process for manufacturing a joint hinge. The once hot-forging shaping process is characterized by adopting the following steps of: (1) adopting an intermediate frequency heating furnace to heat blanked material to 1050 to 1150 DEG C; (2) adopting a pneumatic hammer to directly and lightly upset the material heated by the intermediate frequency heating furnace to remove roll scale on the surface of the material; (3) adopting a friction press blocker to mould unfolding sheet of the joint hinge; (4) utilizing a friction press finisher provided with a V-shaped lower die to mould the unfolding sheet into the joint hinge; (5) adopting a hydraulic shape-adjuster to adjust the shape of the joint hinge; and (6) adopting a metal steel-shot to carry out shot blasting so as to lead the surface of forgeable piece to become silvery white. Compared with the prior art, the invention adopting the once hot-forging shaping process has high efficiency. The roll scale is so thin that the roll scale can be removed before forging so as to obtain excellent surface quality; and after the forgeable piece is shaped, the metal steel-shot is adopted to lead the surface of the forgeable piece to become silvery white through shot blasting so as to bring convenience for metal surface fault detection and to avoid painting treatment; and compared with the cost of flat die forging, the cost of the once hot-forging shaping process can be reduced at least by three times.

Description

One pyrogene type preparation technology of joint hinge

[technical field]

The present invention relates to the joint hinge preparing technical field, relate in particular to an a kind of pyrogene type preparation technology of joint hinge.

[background technology]

Joint hinge, claim U type folder again, U type chuck, suspension clamp, be a large amount of products that use in the station boiler, present boiler seven, 80 meters high, and several ten thousand tons of steel constructions all rely on joint hinge to lift from top to down, so the joint hinge quality is extremely important, must adopt forging to the joint hinge regulation in the world, and need do nondestructive inspection, destructive pull test, former boiler industry adopts the open die forging swage forging, general smallclothes five pyrogene types, middle part seven pyrogene types, make the problem of joint hinge production domesticization obtain the part solution, but part can't be done greatly, but this technology have very big deficiency, need five to seven pyrogene types, greater than 20 kilograms seven fire, so the manufacturing cost height, efficient is low, a class can only produce 4-10 spare, and the heating number of times is too much, the general technology regulation is heated to 950 ℃-1050 ℃, final forging temperature causes element losses such as decarburization greater than 850 ℃, influences quality; In addition, forging has only first fire can remove oxide skin, and back six fire all can not remove, and cause product in fetal membrane, and oxide skin is forged in product, the surface quality extreme difference; And open die forging since oxide skin be clipped in the product, can not ball blast, a ball blast blemish just exposes undoubtedly, the darkest depression can reach and have a strong impact on quality about 4mm and the processing that needs painting; Because five～seven pyrogene types, each temperature is difficult to control evenly, so can cause about two pin, front and back, height are inconsistent, even the tolerance that the drawing design provides is very big, repair rate, scrappage are also still very high.

[summary of the invention]

The objective of the invention is to adopt heating in medium frequency one pyrogene type to prepare joint hinge for overcoming the deficiencies in the prior art.

For achieving the above object, the present invention designs an a kind of pyrogene type preparation technology of joint hinge, it is characterized in that adopting following steps: (1) heating in medium frequency: the good material that will fall adopts the heating in medium frequency stove to be heated to 1050～1150 ℃; (2) remove oxide skin: the raw material that adopts the vertical light rammer heating in medium frequency of pneumatic hammer to cross removes the stock chart surface oxidized skin; (3) blocking: adopt the friction press blocker will remove the expansion sheet that raw material mold pressing after the oxide skin goes out joint hinge; (4) finish-forging: and then adopt the friction press finisher be provided with V-arrangement shape die, the expansion sheet of joint hinge is molded into joint hinge; (5) integer: adopt joint hinge hydraulic pressure reshaper, the joint hinge that mold pressing is gone out carries out integer; (6) metal ball blast: adopt the metal shot to carry out ball blast the joint hinge forging after the integer, make the surface of forging become silvery white.

Described pneumatic hammer is the 750KG pneumatic hammer, and gently upset time of raw material of pneumatic hammer is 5～10 seconds, and raw material length is upset short 4.8%～5.1%.

Shape when described blocker employing is launched into the plane with joint hinge, i.e. the expansion plate shape of joint hinge.

Described friction press adopts 560T or 1600T friction press.

The present invention compared with prior art adopts heating in medium frequency one pyrogene type, so efficient is high, output was 240 in eight hours, actually can reach 360; Owing to be heating in medium frequency one pyrogene type, oxide skin is very thin, and can remove before forging, so surface quality is very good, after the forging moulding, adopt metal shot ball blast, it is silvery white that the surface becomes, be the metal true qualities, very convenient to the metal surface flaw detection, so the processing that do not need painting behind the metal ball blast; Die forging, the mould and die accuracy that adopts all is higher than open die forging far away in addition, and a pyrogene type, and joint hinge two pin all arounds misplace far below open die forging, and forging external form surplus is also put fewly more than open die forging, so cost is than low three times at least of open die forgings.

[description of drawings]

Fig. 1 is the schematic diagram of joint hinge in the embodiment of the invention.

Fig. 2 is the expansion sheet of joint hinge in the embodiment of the invention.

Fig. 3 is the schematic diagram of friction press finisher in the embodiment of the invention.

Appointment Fig. 2 is a Figure of abstract.

[specific embodiment]

Below the present invention will be further described.

The material employing heating in medium frequency stove that one, will fall good is heated to 1050-1150 ℃, and firing rate is decided to be 1-2 minute/part according to the workpiece size, and heating in medium frequency stove power is 100-500KV;

With the 750KG pneumatic hammer workpiece is vertically gently upset, the time is 5-10 second, and length is upset short by about 5%, and removing thickness is 0.1mm left and right sides surface scale;

Two, in 560T or 1600T friction press, process then, according to the workpiece size, process in the 560T press less than the workpiece of 16KG, process in the 1600T press greater than the workpiece of 16KG, basic one-tenth plane in the blocker, the main dispensing materials operating time is 10-20 second.Referring to Fig. 2, this process characteristic is an A, the impact forging moulding of three holes of B, because of workpiece A, B place overall volume maximum, feed consumption is also maximum, and has reduced the materials at the maximum positions of feed consumption after the punching, makes the material distribution at each position in the forging die quite reasonable, thereby make the forging forming, overlap reduces;

Three, adopt again to be provided with and be down trapezoidal shape, the friction press finisher of the die of approximate V font, the expansion sheet of joint hinge is molded into joint hinge, and finisher is referring to Fig. 3, maximum characteristics are as follows: 1, the old technology in C place is the angle that becomes not have radian among the figure, when bending moulding, because interior excessive to deflection, the crooked number of degrees are generally 100 °, it is folding to cause the C place to produce, cause scrappage very high, so former technology necessary 100% is in this place's magnetic and dye penetrant inspection;

And the C place is provided with the radian of buffering in the new technology, referring to Fig. 3, makes crooked about 60 ° of joint hinge moulding, deflection reduces greatly when brake forming, so folding with regard to not causing, the operating time is 5-10 second, be reduced to 5% in industry regulation flaw detection now, some in addition inspection-free.2, the perspective plane reduces greatly during moulding, makes the 1600T friction press just can process maximum joint hinge, and promptly the U type presss from both sides, and reduces cost greatly.

Four, joint hinge integer:

Adopt two symmetric arms of the joint hinge that joint hinge goes out mold pressing with the hydraulic pressure reshaper to locate moulding by the required bending angle of product Fig. 1, its physical dimension has all kept very high precision, changed former two pin length, about the asymmetric equal error in dislocation center, improved product quality greatly, this operating time in step is 5-10 second.

Five, metal ball blast: adopt the metal shot to carry out ball blast the joint hinge after the integer, make the surface of joint hinge become silvery white.

Claims

1. a pyrogene type preparation technology of a joint hinge is characterized in that adopting following steps: (1) heating in medium frequency: the good material that will fall adopts the heating in medium frequency stove to be heated to 1050～1150 ℃; (2) remove oxide skin: the raw material that adopts the vertical light rammer heating in medium frequency of pneumatic hammer to cross removes the stock chart surface oxidized skin; (3) blocking: adopt the friction press blocker will remove the expansion sheet that raw material mold pressing after the oxide skin goes out joint hinge; (4) finish-forging: and then adopt the friction press finisher be provided with the die of falling the trapezoidal shape, the expansion sheet of joint hinge is molded into joint hinge; (5) integer: adopt joint hinge hydraulic pressure reshaper, the joint hinge that mold pressing is gone out carries out integer; (6) metal ball blast: adopt the metal shot to carry out ball blast the joint hinge after the integer, make the surface of joint hinge become silvery white.

2. a pyrogene type preparation technology of joint hinge as claimed in claim 1, it is characterized in that: described pneumatic hammer is the 750KG pneumatic hammer, gently upset time of raw material of pneumatic hammer is 5～10 seconds.

3. a pyrogene type preparation technology of joint hinge as claimed in claim 1 is characterized in that: the shape when described blocker employing is launched into the plane with joint hinge.

4. a pyrogene type preparation technology of joint hinge as claimed in claim 1 is characterized in that: described friction press employing 560T or 1600T friction press.