CN203227749U

CN203227749U - Thermal necking die

Info

Publication number: CN203227749U
Application number: CN 201320271506
Authority: CN
Inventors: 程鸿林
Original assignee: SUZHOU BOXUN INSTRUMENTS CO Ltd
Current assignee: SUZHOU BOXUN INSTRUMENTS CO Ltd
Priority date: 2013-05-19
Filing date: 2013-05-19
Publication date: 2013-10-09
Anticipated expiration: 2023-05-19

Abstract

The utility model discloses a thermal necking die, comprising an upper die body, a die holder, a pull rod and a jacking device from top to bottom, wherein the upper die body is fixed on an upper template; a convex die is connected below the upper die body; the die holder is provided with a concave die; a concave die pad is arranged under the concave die; a resistance wire surrounds the periphery of the die holder and achieves a preheating function; an protective cover covers the die holder; a lower bolster is mounted below the die holder covered by the protective cover; one end of the pull rod is fixedly connected onto the upper die body while the other end is fixed on a pull plate; the middle of the pull rod is connected with the die holder by a pull rod sleeve; the lower end of the jacking device is fixed on the pull plate; during work, the upper die body and the jacking device perform vertical motion along with the pull plate at the same time; the other end of the jacking device is mounted right below the concave die; and during moving, the jacking device can jack a machined work piece in the concave die out. The thermal necking die is simple in structure, convenient to operate, and capable of ensuring the size demands of a machined part, improving the utilization ratio of materials, reducing machining cost and improving production efficiency.

Description

A kind of hot reducing die

[technical field]

The utility model relates to mechanical manufacturing field, relates 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 problem that prior art exists, it is a kind of simple in structure, easy to operate that the purpose of this utility model is to provide, and can effectively guarantee the hot reducing die of processing dimension.

The technical solution adopted in the utility model 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.

The beneficial effects of the utility model are: 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 utility model will be further described below in conjunction with accompanying drawing:

Fig. 1 is the utility model processing work schematic diagram;

Fig. 2 is the utility model processing work blank schematic diagram;

Fig. 3 is schematic diagram behind the utility model processing work pyrocondensation mouth;

Fig. 4 is the utility model structural representation;

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 utility model 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

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

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 utility model has been described, comprise that the inventor is used to implement known optimal mode of the present utility model.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 utility model.Therefore, the utility model comprises all modifications and the equivalents of the purport of quoting in the claim of enclosing, and 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 utility model, unless point out in addition or obvious contradiction in context at this.

Claims

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.