CN103464674B - A kind of hot forging forming method of duplex fork forging - Google Patents

A kind of hot forging forming method of duplex fork forging Download PDF

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Publication number
CN103464674B
CN103464674B CN201310398748.7A CN201310398748A CN103464674B CN 103464674 B CN103464674 B CN 103464674B CN 201310398748 A CN201310398748 A CN 201310398748A CN 103464674 B CN103464674 B CN 103464674B
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forging
die
finish
present
fork
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CN103464674A (en
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郭增均
赵震
杨帆
胡成亮
资小林
曾凡
吴公明
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Shanghai Jiaotong University
Wanxiang Qianchao Co Ltd
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Shanghai Jiaotong University
Wanxiang Qianchao Co Ltd
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Abstract

The present invention relates to a kind of hot forging forming method of duplex fork forging, comprise blanking, preheated mold, heating blank, flat-die jumping-up, the shaping of not contour cross section flash gutters finish-forging and punching trimming, wherein the blank heated is placed in jumping-up on flat-die, upset is the 15%-25% of height; Pre-forging is placed in finish-forging die cavity, carries out finish-forging shaping; Finish-forging part is placed in punching shaving die, carries out punching trimming, obtain final forging.The effect that the present invention is useful is: the present invention and the universal-joint fork by 2 standards are changed a social system compared with rear welding procedure, and present invention process flow process is short, and material use is high, and production efficiency is high, low cost of manufacture; Compared with cast forging process, gained duplex fork of the present invention is because having better mechanical property through plastic deformation; Compared with forward Splicing Mechanism technique, mould structure of the present invention is simple, and die cost is low, and process implementing is convenient.

Description

A kind of hot forging forming method of duplex fork forging
Technical field
The present invention relates to metal hot forging forming and manufacture field, especially a kind of hot forging forming method of duplex fork forging.
Background technology
Duplex fork is a complex-shaped class fork-shaped part, and all there is the fork configuration of certain altitude these part both sides, and traditional duplex fork structure is welded after needing to carry out transformation of the way processing with the universal-joint fork of 2 standards, waste of raw materials is serious, production process is many, and efficiency is low, and manufacturing cost is high.Zhang Jiali etc. are in paper " the improvement analysis of experiments of transmission shaft with duplex fork structure " (agriculture project, 2012,2 (2), point out 90-92), adopt cast forging process one-shot forming duplex fork, both added intensity and turn improved precision, and shortened the manufacturing cycle.Summer, huge Zan waited at paper " research of power transmission shaft Y-piece forward Splicing Mechanism technique " (forging technology, 1991,16 (4), propose 15-18) and adopt forward Splicing Mechanism technique, the bar blank being heated to initial forging temperature is placed in the closed impression that can divide die, under the effect of drift, bar blank is extruded die forging and becomes universal-joint fork.This process increases stock utilization, but do not relate to duplex fork forging; And the divided die adopted, mould structure is complicated, if for duplex fork, patrix and counterdie all need employing can separation structure, and Mould design and manufacturing is very difficult.
Summary of the invention
The present invention will solve the shortcoming of above-mentioned prior art, a kind of hot forging forming method provide that stock utilization is high, abrasive article structures is simple, produced stable duplex fork forging in batches.
The present invention solves the technical scheme that its technical problem adopts: the hot forging forming method of this duplex fork forging, and step is as follows:
(1) blanking: adopt round bar sawing, ratio of height to diameter of the ingot is not more than 1.5;
(2) preheated mold: heat Preform Die and finish-forging die, makes mold temperature maintain 200 DEG C ~ 300 DEG C;
(3) blank is heated: be placed in by blank in intermediate frequency furnace and be heated to 1100 DEG C ~ 1150 DEG C;
(4) flat-die jumping-up: the blank heated is placed in jumping-up on flat-die, upset is the 15%-25% of height;
(5) not contour cross section flash gutters finish-forging is shaped: be placed in by pre-forging in finish-forging die cavity, carry out finish-forging shaping;
(6) punching trimming: finish-forging part is placed in punching shaving die, carries out punching trimming, obtains final forging.
The upper die and lower die of described blocking heading die all have horizontal cross-section.
Described finish-forging die is vertical mould-dividing mode, finish-forging punch is identical with finish-forging die shape, be arranged symmetrically with, the flash gutters structure of finish-forging die adopts unequal section flash gutters form, forging fork-shaped side flash thickness is larger than connecting portion side flash thickness, neither contour cross section intersection adopts chamfered transition, and the shape of finish impression and size and the duplex fork finish-forging hot forging shape designed in advance and size match.
The effect that the present invention is useful is: the present invention and the universal-joint fork by 2 standards are changed a social system compared with rear welding procedure, and present invention process flow process is short, and material use is high, and production efficiency is high, low cost of manufacture; Compared with cast forging process, gained duplex fork of the present invention is because having better mechanical property through plastic deformation; Compared with forward Splicing Mechanism technique, mould structure of the present invention is simple, and die cost is low, and process implementing is convenient.
Accompanying drawing explanation
Fig. 1 is a kind of forging front view of duplex fork;
Fig. 2 is a kind of forging side view of duplex fork;
Fig. 3 is finish-forging die front view of the present invention;
Fig. 4 is finish-forging die side view of the present invention;
Fig. 5 is finish-forging die top view of the present invention;
Fig. 6 is the schematic diagram of unequal section transition position of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in the figure, the hot forging forming method of this duplex fork forging, concrete steps are as follows:
(1) blanking: adopt round bar sawing, ratio of height to diameter of the ingot is not more than 1.5;
(2) preheated mold: heat Preform Die and finish-forging die, makes mold temperature maintain 200 DEG C ~ 300 DEG C;
(3) blank is heated: be placed in by blank in intermediate frequency furnace and be heated to 1100 DEG C ~ 1150 DEG C;
(4) flat-die jumping-up: the blank heated is placed in jumping-up on flat-die, upset is the 15%-25% of height;
(5) not contour cross section flash gutters finish-forging is shaped: be placed in by pre-forging in finish-forging die cavity, carry out finish-forging shaping;
(6) punching trimming: finish-forging part is placed in punching shaving die, carries out punching trimming, obtains final forging.
Implementation process needs a set of blocking heading die and a set of finish-forging shaping dies.The upper die and lower die of blocking heading die all have horizontal cross-section.Finish-forging die is vertical mould-dividing mode, finish-forging punch is identical with finish-forging die shape, be arranged symmetrically with, the flash gutters structure of finish-forging die adopts unequal section flash gutters form, forging fork-shaped side flash thickness is larger than connecting portion side flash thickness, namely forging fork-shaped side flash thickness is 4mm ~ 6mm, 2mm ~ 3mm larger than connecting portion side flash thickness, neither contour cross section intersection adopts chamfered transition, surface width 35mm ~ 40mm, the shape of finish impression and size and the duplex fork finish-forging hot forging shape designed in advance and size match.
Embodiment 1
Certain model power transmission shaft duplex fork, material selection SAE1141 steel alloy, process equipment is 25000kN hotdie forging press, and its technical process is:
One, blanking: adopt play to cut cutting mode, billet size Φ 70 × 100mm;
Two, preheated mold: the impression up and down of Preform Die and finish-forging die is heated, by mold heated to 220 DEG C;
Three, blank is heated: blank is placed in intermediate frequency furnace and is heated to 1100 DEG C;
Four, flat-die jumping-up: by the round bar shape blank jumping-up on flat-die heated, upset is 20mm.
Five, finish-forging is shaped: be placed in by pre-forging in finish-forging die cavity, carry out finish-forging shaping.Fork-shaped side flash thickness is 5mm, and connecting portion side flash thickness is 3mm, and two overlap unequal sections adopt chamfered transition, and slope level width is 40mm;
Six, punching trimming: finish-forging part is placed in punching shaving die, carries out punching trimming, obtains final forging.
The forging filling that the present embodiment obtains is full, and intensity is high, has no crackle after magnetic powder inspection.
Embodiment 2
Certain model power transmission shaft duplex fork, material selection No. 45 steel, process equipment is 25000kN hotdie forging press, and its technical process is:
One, blanking: adopt play to cut cutting mode, billet size Φ 70 × 100mm;
Two, preheated mold: the impression up and down of Preform Die and finish-forging die is heated, by mold heated to 250 DEG C;
Three, blank is heated: blank is placed in intermediate frequency furnace and is heated to 1150 DEG C;
Four, flat-die jumping-up: by the round bar shape blank jumping-up on flat-die heated, upset is 20mm;
Five, finish-forging is shaped: be placed in by pre-forging in finish-forging die cavity, carry out finish-forging shaping.Fork-shaped side flash thickness is 5mm, and connecting portion side flash thickness is 3mm, and two overlap unequal sections adopt chamfered transition, and slope level width is 40mm;
Six, punching trimming: finish-forging part is placed in punching shaving die, carries out punching trimming, obtains final forging.
The forging filling that the present embodiment obtains is full, and intensity is high, has no crackle after magnetic powder inspection.
Embodiment 3
Certain model power transmission shaft duplex fork, material selection SAE1141 steel alloy, process equipment is 25000kN hotdie forging press, and its technical process is:
One, blanking: adopt play to cut cutting mode, billet size Φ 70 × 100mm;
Two, preheated mold: the impression up and down of Preform Die and finish-forging die is heated, by mold heated to 250 DEG C;
Three, blank is heated: blank is placed in intermediate frequency furnace and is heated to 1120 DEG C;
Four, flat-die jumping-up: by the round bar shape blank jumping-up on flat-die heated, upset is 18mm;
Five, finish-forging is shaped: be placed in by pre-forging in finish-forging die cavity, carry out finish-forging shaping.Fork-shaped side flash thickness is 5mm, and connecting portion side flash thickness is 3mm, and two overlap unequal sections adopt chamfered transition, and slope level width is 40mm;
Six, punching trimming: finish-forging part is placed in punching shaving die, carries out punching trimming, obtains final forging.
The forging filling that the present embodiment obtains is full, and intensity is high, has no crackle after magnetic powder inspection.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.

Claims (1)

1. a hot forging forming method for duplex fork forging, is characterized in that: concrete steps are as follows:
(1) blanking: adopt round bar sawing, ratio of height to diameter of the ingot is not more than 1.5;
(2) preheated mold: heat Preform Die and finish-forging die, makes mold temperature maintain 200 DEG C ~ 300 DEG C;
(3) blank is heated: be placed in by blank in intermediate frequency furnace and be heated to 1100 DEG C ~ 1150 DEG C;
(4) flat-die jumping-up: the blank heated is placed in jumping-up on flat-die, upset is the 15%-25% of height, and the upper die and lower die of described Preform Die all have horizontal cross-section;
(5) not contour cross section flash gutters finish-forging is shaped: be placed in by pre-forging in finish-forging die cavity, carry out finish-forging shaping; Described finish-forging die is vertical mould-dividing mode, finish-forging punch is identical with finish-forging die shape, be arranged symmetrically with, the flash gutters structure of finish-forging die adopts unequal section flash gutters form, forging fork-shaped side flash thickness is larger than connecting portion side flash thickness, neither contour cross section intersection adopts chamfered transition, and the shape of finish impression and size and the duplex fork finish-forging hot forging shape designed in advance and size match;
(6) punching trimming: finish-forging part is placed in punching shaving die, carries out punching trimming, obtains final forging.
CN201310398748.7A 2013-09-04 2013-09-04 A kind of hot forging forming method of duplex fork forging Active CN103464674B (en)

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105127357A (en) * 2015-08-12 2015-12-09 曹立新 Method for realizing hot extrusion forging of forging blank for flange yoke
CN105127356A (en) * 2015-08-12 2015-12-09 曹立新 Method for implementing hot extrusion forging of universal joint yoke forging blank
CN105855799A (en) * 2016-04-21 2016-08-17 昌利锻造有限公司 Machining method of axial joint fork
CN109773098B (en) * 2019-03-15 2020-04-21 上海嘉仕久企业发展有限公司 Automobile steering knuckle processing technology and blanking measuring device used for same

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Publication number Priority date Publication date Assignee Title
DE3612893A1 (en) * 1986-04-17 1987-10-29 Falkenroth Soehne Method and forging die for manufacturing universal joint halves with in each case fork and shaft connection flange for universal joint shafts
CN1785550A (en) * 2005-11-08 2006-06-14 内蒙古第一机械制造(集团)有限公司 Forging method of soliding fork
CN102371326A (en) * 2010-08-20 2012-03-14 上海交大中京锻压有限公司 Preforging mould structure for processing shaft fork part stamp forgings
CN202894165U (en) * 2012-09-26 2013-04-24 湖北林杰实业有限公司 Double-lug flat-base flange yoke forging die
CN103121075A (en) * 2013-03-07 2013-05-29 上海交通大学 Hot forging method for transmission shaft yoke with horizontal yoke part
CN202984562U (en) * 2012-12-26 2013-06-12 许昌中兴锻造有限公司 Pre-forging die for spline shaft yokes

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DE3612893A1 (en) * 1986-04-17 1987-10-29 Falkenroth Soehne Method and forging die for manufacturing universal joint halves with in each case fork and shaft connection flange for universal joint shafts
CN1785550A (en) * 2005-11-08 2006-06-14 内蒙古第一机械制造(集团)有限公司 Forging method of soliding fork
CN102371326A (en) * 2010-08-20 2012-03-14 上海交大中京锻压有限公司 Preforging mould structure for processing shaft fork part stamp forgings
CN202894165U (en) * 2012-09-26 2013-04-24 湖北林杰实业有限公司 Double-lug flat-base flange yoke forging die
CN202984562U (en) * 2012-12-26 2013-06-12 许昌中兴锻造有限公司 Pre-forging die for spline shaft yokes
CN103121075A (en) * 2013-03-07 2013-05-29 上海交通大学 Hot forging method for transmission shaft yoke with horizontal yoke part

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