CN103240340A - Thermal necking die - Google Patents

Thermal necking die Download PDF

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Publication number
CN103240340A
CN103240340A CN2013101841194A CN201310184119A CN103240340A CN 103240340 A CN103240340 A CN 103240340A CN 2013101841194 A CN2013101841194 A CN 2013101841194A CN 201310184119 A CN201310184119 A CN 201310184119A CN 103240340 A CN103240340 A CN 103240340A
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Prior art keywords
die
die holder
holder
upper die
backing
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CN2013101841194A
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Chinese (zh)
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程鸿林
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SUZHOU BOXUN INSTRUMENTS CO Ltd
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SUZHOU BOXUN INSTRUMENTS CO Ltd
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Priority to CN2013101841194A priority Critical patent/CN103240340A/en
Publication of CN103240340A publication Critical patent/CN103240340A/en
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Abstract

The invention discloses a thermal necking die. The thermal necking die comprises an upper die body, a die holder, a pull rod and an ejector, wherein the upper die body is fixed on an upper template and the lower portion of the upper die body is connected with a male die. A female die is installed on the die holder, a female die cushion is positioned below the female die, resistance wires are surrounded on the periphery of the die holder and have preheating effect, a protecting cover is further covered outside the die holder, and a lower cushion plate is installed below the die holder where the protecting cover is covered. One end of the pull rod is fixedly connected to the upper die body, the middle of the pull rod is connected with the die holder through a pull rod sleeve, the other end of the pull rod is fixed on a pulling plate, the lower end of the ejector is also fixed on the pulling plate simultaneously, and in work, the upper die body and the ejector can simultaneously move up and down along with the pulling plate; the other end of the ejector is installed under the female die, and the ejector can eject a processed workpiece in the female die when moving upwards. The thermal necking die is simple in structure and convenient to operate, not only meets the dimension requirements of processed parts, but also improves material utilization rate, reduces processing cost and improves production efficiency.

Description

A kind of hot reducing die
 
[technical field]
The present invention relates to mechanical manufacturing field, relate in particular to a kind of hot reducing die.
[background technology]
Workpiece as shown in Figure 1, workpiece material is 2A12, require solution treatment natrual ageing after, σ-b 〉=412MPa, δ 〉=8%.Described workpiece is combined by large and small pipe and circular arc, and wall thickness is unequal everywhere, and maximum ga(u)ge is 5.6mm, and minimum thickness is 1.85mm(microcephaly screw thread undercut), differ bigger, be that a typical case does not wait the tubaeform workpiece of wall thickness.Usually this workpiece adopts a series of manufacturing procedures such as tubing pyrocondensation mouth, shaping base and then machining.In pyrocondensation mouth operation, need to design the hot reducing die of a cover so.
[summary of the invention]
At the shortcoming of prior art, the object of the present invention is to provide a kind of simple in structurely, easy to operate, can effectively guarantee the hot reducing die of processing dimension.
The technical solution used in the present invention is: a kind of hot reducing die is characterized in that: comprise upper die body, die holder, pull bar and backing-out punch four major parts from top to bottom; Wherein upper die body is fixed on the cope match-plate pattern, and the below of upper die body is connected with punch; Die is installed on the die holder, under the die die supporter is arranged, around resistance wire, resistance wire plays the effect of preheating around the die holder, and die holder also is covered with guard shield outward, and the die holder below that is covered with guard shield is equipped with lower bolster; One end of pull bar is fixedly connected on the upper die body, middle is connected with die holder by drag link sleeve, and the other end is fixed on the arm-tie, and the while lower end of backing-out punch also is fixed on the arm-tie, and during work, upper die body and backing-out punch can be done simultaneously and move up and down along with arm-tie; The other end of backing-out punch be installed in die under, can eject the processing work in the die when moving on the backing-out punch.
Further, described upper die body is fixedly connected on the cope match-plate pattern by screw.
Further, described die holder is fixedly connected on the lower bolster by screw.
Further, the resistance wire power line passes guard shield by the porcelain circle.
Beneficial effect of the present invention is: simple in structure, easy to operate, and namely guarantee the dimensional requirement of processing parts, and improved the utilization rate of material, reduced processing cost, improved production efficiency.
[description of drawings]
The invention will be further described below in conjunction with accompanying drawing:
Fig. 1 is processing work schematic diagram of the present invention;
Fig. 2 is processing work blank schematic diagram of the present invention;
Fig. 3 is schematic diagram behind the processing work pyrocondensation mouth of the present invention;
Fig. 4 is structural representation of the present invention;
1, cope match-plate pattern 2, upper die body 3, pull bar 4, punch 5, pressing plate 6, porcelain circle 7, die 8, die supporter 9, resistance wire 10, guard shield 11, die holder 12, backing-out punch 13, lower bolster 14, drag link sleeve 15, arm-tie
[specific embodiment]
Referring to accompanying drawing, the present invention is a kind of hot reducing die, it is characterized in that: comprise upper die body 2, die holder 11, pull bar 3 and backing-out punch 12 4 major parts from top to bottom; Wherein upper die body 2 is fixed on the cope match-plate pattern 1, and the below of upper die body 2 is connected with punch 4; Die 7 is installed on the die holder 11, and die has die supporter 87 times, and around resistance wire 9, resistance wire 9 plays the effect of preheating around the die holder 11, also is covered with guard shield 10 outside the die holder 11, and die holder 11 belows that are covered with guard shield 10 are equipped with lower bolster 13; One end of pull bar 3 is fixedly connected on the upper die body 2, the middle drag link sleeve 14 that passes through is connected with die holder 11, and the other end is fixed on the arm-tie 15, and the lower end of backing-out punch 12 also is fixed on the arm-tie 15 simultaneously, during work, upper die body 2 and backing-out punch 12 can be done simultaneously and move up and down along with arm-tie 15; The other end of backing-out punch 12 be installed in die 7 under, can eject the processing work in the die 7 when moving on the backing-out punch 12.
Further, described upper die body 2 is fixedly connected on the cope match-plate pattern 1 by screw.
Further, described die holder 11 is fixedly connected on the lower bolster 13 by screw.
Further, resistance wire 9 power lines pass guard shield 10 by the porcelain circle.
Operation principle: the calculating of reducing deformation extent: the reducing deformation extent with reducing after the expression recently of blank smuggling before diameter of work and the reducing, this ratio is called necking coefficient.Necking coefficient m represents m=d/D, and wherein d is the diameter after the reducing, and D is the diameter before the reducing.Be example with part shown in Figure 1: m=d/D=68/110=0.618.
By above calculating, to the 2A12 material, when outside adopting, supporting reducing, limit necking coefficient [m]=0.60~0.63, although this part necking coefficient m is near limit necking coefficient [m], we take some technological measures can a necking forming when reducing.
The calculating of blank height: to the taper reducing, when the tubular exit portion is arranged, the blank height
Figure 2013101841194100002DEST_PATH_IMAGE001
In the formula, h 1 is part oral area height after the reducing; H 2 is reducing crushed element height not; D is not crushed element diameter (middle footpath) of reducing; D is part oral area smuggling (middle footpath) after the reducing; α is the half-angle of taper reducing.
For this part, h 1=29.6mm, h 2=24mm, D=101mm, d=58mm, α=31.4 °.
With above numerical value substitution following formula
Figure 2013101841194100002DEST_PATH_IMAGE002
Blank H=85.5mm.
The calculating of necking force and equipment are selected: in the reducing deformation process, and except oral area, the change of shoulder diameter, the change of wall thickness also will be through twice bending.Therefore, the calculating more complicated of necking force.When no core reducing die reducing, the calculating of necking force is general adopts following formula
In the formula, P is necking force; T 0 is material thickness before the reducing; D is blank diameter (middle footpath) before the reducing; D is workpiece reducing section diameter; μ is blank and die contact-making surface coefficient of friction, adopts the oil base graphite lubrication, general μ=0.15~0.25; σ b is the tensile strength of material, σ b=147~211MPa; α is die circular cone semi-cone angle; K is velocity coeffficient, on hydraulic press during workpiece, and K=1.
For this part t 0=9mm, D=101mm, d=58mm, α=31.4 °, μ=0.25, σ b=211MPa, K=1.
With numerical value substitution following formula: P=008N ≈ 4205kN
Select the Y32-500 hydraulic press for use.
In process of production, before the pyrocondensation mouth, must carry out preheating to mould, preheat temperature is 280~320 ° of C.
During the pyrocondensation mouth, must be lubricated reducing punch 4, die 7.Lubricant is selected the oil base aquadag for use.
To the 2A12 material, when heating-up temperature reached 506 ° of C, blank will produce burn-off phenomenon, therefore must strict heating-up temperature and the temperature thereof of controlling blank beat.The heating-up temperature of blank is 400~450 ° of C.
At this preferred embodiment that this invention has been described, comprise that the inventor is used to implement known optimal mode of the present invention.The change of preferred embodiment is apparent for those of ordinary skills after reading above-mentioned explanation.The inventor wishes the change that the those of ordinary skill rational Application is such, and the inventor thinks and offers some clarification on different application at this and also can realize the present invention.Therefore, the present invention includes all modifications and the equivalents of the purport of quoting in the claim of enclosing, this allows in the law that is suitable for.In addition, any combination of all possible change of above-mentioned key element is also comprised by the present invention, unless point out in addition or obvious contradiction in context at this.
?

Claims (4)

1. a hot reducing die is characterized in that: comprise upper die body, die holder, pull bar and backing-out punch four major parts from top to bottom; Wherein, upper die body is fixed on the cope match-plate pattern, and the below of upper die body is connected with punch; Die is installed on the die holder, under the die die supporter is arranged, around resistance wire, resistance wire plays the effect of preheating around the die holder, and die holder also is covered with guard shield outward, and the die holder below that is covered with guard shield is equipped with lower bolster; One end of pull bar is fixedly connected on the upper die body, middle is connected with die holder by drag link sleeve, and the other end is fixed on the arm-tie, and the while lower end of backing-out punch also is fixed on the arm-tie, and during work, upper die body and backing-out punch can be done simultaneously and move up and down along with arm-tie; The other end of backing-out punch be installed in die under, can eject the processing work in the die when moving on the backing-out punch.
2. hot reducing die according to claim 1, it is characterized in that: described upper die body is fixedly connected on the cope match-plate pattern by screw.
3. hot reducing die according to claim 1, it is characterized in that: described die holder is fixedly connected on the lower bolster by screw.
4. hot reducing die according to claim 1, it is characterized in that: described resistance wire power line passes guard shield by the porcelain circle.
CN2013101841194A 2013-05-19 2013-05-19 Thermal necking die Pending CN103240340A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104128503A (en) * 2014-07-23 2014-11-05 成都市龙泉驿区齐盛机械厂 Self-return necking die
CN104139114A (en) * 2014-07-23 2014-11-12 成都市龙泉驿区齐盛机械厂 Self-return type necking die with sealing structure
CN110116171A (en) * 2019-05-29 2019-08-13 远军热能动力科技有限公司 Necking processing mold and its processing method in a kind of workpiece

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1461564A1 (en) * 1986-12-22 1989-02-28 Предприятие П/Я А-1928 Die for reducing thin-walled tubular billets
CN1500575A (en) * 2002-11-13 2004-06-02 中国船舶重工集团公司第七一一研究所 Necking-down process for aluminium alloy air bottle
CN101670400A (en) * 2009-09-24 2010-03-17 成都联创精密机械有限公司 Combined necking die
CN202398731U (en) * 2012-01-16 2012-08-29 浙江金盾消防器材有限公司 Necking device for bottom of steel seamless gas cylinder
CN102699218A (en) * 2012-05-17 2012-10-03 太仓奥科机械设备有限公司 Necking device of gas cylinder
CN202655498U (en) * 2012-06-27 2013-01-09 晋西工业集团有限责任公司 Hot shell nosing device for rear section of rocket nozzle
CN203227749U (en) * 2013-05-19 2013-10-09 苏州博讯仪器有限公司 Thermal necking die

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1461564A1 (en) * 1986-12-22 1989-02-28 Предприятие П/Я А-1928 Die for reducing thin-walled tubular billets
CN1500575A (en) * 2002-11-13 2004-06-02 中国船舶重工集团公司第七一一研究所 Necking-down process for aluminium alloy air bottle
CN101670400A (en) * 2009-09-24 2010-03-17 成都联创精密机械有限公司 Combined necking die
CN202398731U (en) * 2012-01-16 2012-08-29 浙江金盾消防器材有限公司 Necking device for bottom of steel seamless gas cylinder
CN102699218A (en) * 2012-05-17 2012-10-03 太仓奥科机械设备有限公司 Necking device of gas cylinder
CN202655498U (en) * 2012-06-27 2013-01-09 晋西工业集团有限责任公司 Hot shell nosing device for rear section of rocket nozzle
CN203227749U (en) * 2013-05-19 2013-10-09 苏州博讯仪器有限公司 Thermal necking die

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
李林鑫: "后支撑加工工艺研究", 《热加工工艺》 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104128503A (en) * 2014-07-23 2014-11-05 成都市龙泉驿区齐盛机械厂 Self-return necking die
CN104139114A (en) * 2014-07-23 2014-11-12 成都市龙泉驿区齐盛机械厂 Self-return type necking die with sealing structure
CN110116171A (en) * 2019-05-29 2019-08-13 远军热能动力科技有限公司 Necking processing mold and its processing method in a kind of workpiece
CN110116171B (en) * 2019-05-29 2024-03-29 远军热能动力科技有限公司 Workpiece inner shrinkage processing die and processing method thereof

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