CN1060562C - Heat treatment furnaces and process for heat treatment of metal workpiece - Google Patents
Heat treatment furnaces and process for heat treatment of metal workpiece Download PDFInfo
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- CN1060562C CN1060562C CN 94101085 CN94101085A CN1060562C CN 1060562 C CN1060562 C CN 1060562C CN 94101085 CN94101085 CN 94101085 CN 94101085 A CN94101085 A CN 94101085A CN 1060562 C CN1060562 C CN 1060562C
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Abstract
The heat treatment furnace used for the heat treatment of the metal work piece comprises a high-temperature tunnel furnace and a low-temperature furnace, a receiving station of the heat treatment part that can move in whole tunnel furnace, and a feeding and discharging mouth which can be closed and is used for feeding and discharging the heat treatment part. The structure of the high-temperature furnace and the low-temperature furnace is ring-shaped. Either furnace has only one feeding mouth closed with one furnace door. The receiving station of the heat treatment part is born by the bottom of a concentric rotational turning furnace located on a rotary connecting unit. The receiving station rotates around the furnace.
Description
The present invention at first relates to a kind of heat-treatment furnace that metal works is heat-treated.This heat-treatment furnace is by forming with the lower part: one is used for the ring-type circular tunnel stove of high-temperature region and/or the ring-type circular tunnel stove that is used for low-temperature space; At the bottom of the rotary furnace that is rotated around continuous tunnel furnace, furnace bottom is divided into several and the annealing part receiving platform that heat treatment station adapts, and along with rhythmic program at the bottom of the rotary furnace is rotated, each part receiving platform of annealing all can be feeded.In addition, heat-treatment furnace is equipped with separated partition wall at the bottom of the rotary furnace and the charging door that is used for loading, unloading annealing part that can cut out.
By DE 3427716C1 patent, people have been familiar with such heat-treatment furnace, for example with this heat-treatment furnace malleable cast iron are heat-treated.This is used for the continuous tunnel furnace that heat treated workpiece will be divided into several different heat treatment districts by the dividing plate that is moved.A kind of furnace atmosphere in each heat-treatment zone.Problem is under high-temperature condition, and dividing plate is moved, and will cause very big mechanical loss.Although need so big loss, still can observe the less jump in temperature that is accompanied by the temperature feedback.And this jump in temperature, such as be quite serious to the structural damage that white heart malleable cast iron.
The task of the present invention is that development this paper starts described heat-treatment furnace.This heat-treatment furnace one side floor space when building is little, can avoid the temperature feedback on the other hand again effectively.
Ways of addressing this issue is, partition wall has the unlimited type opening that has all the time, and opening is basically with to be used for the external form of heat treated workpiece consistent; Carrying be used for heat treated workpiece first terminal station and carrying that regulation has 3 empty stations between last loading terminal of the intact workpiece of heat treatment.
Stipulate that on a kind of useful furnace binding the charging door of high temperature furnace and low temperature oven two stoves is relative arranges installation, in the middle of two stoves a central charger being installed is that two stoves are feeded incessantly; Another furnace binding stipulates that then several high temperature furnaces and several low temperature oven are arranged mutually and be mounted to delegation, is these charge of stove incessantly by a central charger.By above measure, just created a kind of heat-treatment furnace, it had both saved the continous way fire grate, had saved Dump gate again.Owing to be the circle structure, so the workpiece that stove only needs a common charging door dress to be used for annealing moves back the workpiece that overdoes with unloading.
For make in the continuous tunnel furnace inert gas atmosphere charging and during discharging owing to open charging door without interruption, done following regulation: the charging door at stove is equipped with flame curtains jet pipe and nitrogen nozzle.
Another task of the present invention is to create a kind of technology.Adopt this technology, when dress annealing part, can adopt simple method and don't produce jump in temperature.In the heat treatment time of regulation, can guarantee temperature-resistant simultaneously.
Ways of addressing this issue is that one of centre in 3 empty stations of position, top will be located immediately at charging door.An annealing of backward rotation part receiving platform at the bottom of the rotary furnace, first sky erect-position is in charging door at this moment, and the heat treated workpiece that is used on the new clothes is put into first empty station.Rotate 3 receiving platforms then at the bottom of the rotary furnace forward, at this moment want first receiving platform in the receiving platform of discharging to be positioned at the charging door discharging.After the intact workpiece of first heat treatment takes out from continuous tunnel furnace, receiving platform of backward rotation again at the bottom of the rotary furnace.Have 3 empty erect-positions again in charging door, adjacent back at charging door, the centre in them this moment.
Created a kind of like this technology by above measure, when adopting this technology, between the low temperature starting end of dress annealing material and high temperature terminal, formed a temperature bridges (buffering) in same charging door discharging.This temperature bridges (buffering) has guaranteed that last heat treatment station can keep desired temperature, and has loaded onto the cold burden that is used for heat-treating in its front, but has avoided jump in temperature.
That is to say to the present invention proposes a kind of heat-treatment furnace that metal works is heat-treated, it is by forming with the lower part: a ring-type continuous tunnel furnace and/or a ring-type continuous tunnel furnace that is used for low-temperature space that is used for the high-temperature region; One in continuous tunnel furnace at the bottom of the rotary furnace around its rotation, be divided into the annealing part receiving platform that several and heat treatment station adapt at the bottom of the rotary furnace, along with the rhythmic program of furnace bottom is rotated, each annealing part receiving platform all can be feeded, in addition, heat-treatment furnace also is equipped with separated partition wall at the bottom of the rotary furnace and the charging door that is used for loading, unloading annealing part that can cut out, and the characteristics of this heat-treatment furnace are: partition wall has one the type opening is arranged all the time, the profile basically identical of the shape of opening and annealing part; In first terminal station of carrying the heat treatment part with carrying that regulation has 3 empty stations between loading terminal in back of heat treated workpiece.
Be positioned at two empty stations of receiving platforms formation of annealing the part receiving platform and being adjacent at the bottom of the rotary furnace at charging door place.
Circular tunnel stove jet-flow heating tube or electricity consumption indirect.
The charging door of ring-type circular tunnel stove is equipped with flame curtains jet pipe and inert gas jet pipe.
The loading, unloading material all can be carried out by a central charger in the circular tunnel stove of several ring-types and the loading platform that is positioned at the stove outside that matches with it, discharging platform and modifier treatment station.
High temperature furnace is relative with low temperature oven arranges installation, and promptly the charging door of two stoves is relative.Central authorities' charger is positioned in the middle of two stoves.Therefore two stoves all can be feeded incessantly, and interconnect by an isolation ward.
Several high temperature furnaces and low temperature oven are arranged in together mutually, and can enough charger of walking on rail set feed incessantly.
To metal works heat-treating process flow process, the particularly technological process of the heat-treatment furnace of forming by the low temperature continuous tunnel furnace of the high temp tunnel stove of a ring-type and a ring-type.This heat-treatment furnace is equipped with at the bottom of the rotary furnace that rotates around continuous tunnel furnace, is divided into several receiving platforms at the bottom of the rotary furnace and is used to accept the charging basket that the annealing material is housed.Along with rhythmic stroke at the bottom of the rotary furnace rotates, each receiving platform at the bottom of the rotary furnace all can be feeded.In addition, be equipped with in the continuous tunnel furnace separated partition wall at the bottom of the rotary furnace and the charging door that is used for loading, unloading annealing part that can close.Particularly by above-described technological process, be characterized in: one of the centre that is arranged in 3 empty stations of position, top is located immediately at charging door.Receiving platform of backward rotation at the bottom of the rotary furnace, this moment, first sky erect-position was in charging door.The workpiece that will be used for annealing is put on first empty station subsequently, will rotate 3 receiving platforms forward along rotation direction at the bottom of the rotary furnace then, and first at this moment should the receiving platform of discharging is positioned at the charging door discharging.When first moves back after the workpiece that overdoes takes out from continuous tunnel furnace, a receiving platform rotates backward at the bottom of the rotary furnace.Have 3 empty erect-positions again in charging door this moment.Adjacent back, centre during 3 skies are stood at charging door.
The annealing part in the stop process of a heat treatment station, for balanced annealing temperature, can be forward or the width of the receiving platform that rotates backward.
Heat-treatment furnace can use a kind of protective gas annealing.
This invention will be set forth with example and illustrated by means of the drawing of enclosing.These drawings are:
Fig. 1 is a front view that is installed in the heat-treatment furnace that the charger in the middle of two stoves forms by a high temperature furnace, low temperature oven and.
Fig. 2 is the top view of the heat-treatment furnace shown in Fig. 1.
Fig. 3 is a kind of top view of heat-treatment furnace.This heat-treatment furnace by two pairs each by a high temperature rotating furnace bottom continuous tunnel furnace and low temperature rotary furnace at the bottom of continuous tunnel furnace the annealing device that is arranged in together be installed formed.Continuous tunnel furnace is by a charger charging of walking on rail set.
Fig. 4 is the front view of the heat-treatment furnace shown in Fig. 3, and part is analysed and observe.
Fig. 5 A to Fig. 5 D is that jump in temperature is feeded in order to avoid, the caption of discharging stroke according to the requirement of invention.In loading, unloading material process, rotate 4 different positions at the bottom of the rotary furnace.
Heat-treatment furnace 10 shown in Fig. 1 and Fig. 2 at first is made up of 11 and low temperature oven of a high temperature furnace (HT-stove) (NT-stove) 12.A central charger is housed between two stoves, and promptly automatic loading machine 13.
As shown in Figure 2, high temperature furnace 11 and low temperature oven 12 respectively are made up of the tunnel 15 of a circle, and all there is a charging door 36 in each tunnel.Two charging doors 36 are arranged relatively, and each charging door is closed by a door 31 that moves up and down.
As shown in Figure 1, high temperature furnace 11 and low temperature oven 12 respectively are equipped with a concentric revolving joint 14, for example a large-scale ball bearing revolving joint.On revolving joint, the rotary bracket 16 that is supported by rotating turret 16a can rotate.The outside direction of rotary bracket 16 upper edge radiuses is at the bottom of the rotary furnace of a ring-type 28.It at the bottom of the rotary furnace a fixing ring-type annealing chamber 43 that is closed.
Annealing chamber 43 28 forms at the bottom of the rotary furnace of bottom lock by the fire clay muffle 26 of 15, one bottom-open of circular tunnel with fire clay muffle 26.In order to make sealing between 28 at the bottom of fire clay muffle 26 and the rotary furnace, circular tunnel 15 is installed 2 concentric seal cups 25 and 25a.The outside seal cup 25 in footpath is by fixing with 28 concentric sealed supports 17 at the bottom of the ring-type rotary furnace, and the outside seal cup 25a in footpath is then fixing by stove shell 47.
28 are manufactured by refractory material at the bottom of circular tunnel 15 and the rotary furnace.28 are divided into annealing part receiving platform 48 at the bottom of several rotary furnaces at the bottom of the rotary furnace.Furnace bottom annealing part receiving platform 48 matches with heat treatment station 37.The basket formula charging pallet 35 that annealing part 23 is housed of putting several lattice-shapeds that can be paired on furnace bottom annealing part receiving platform 48.Rotary bracket 16 by the rotary furnace that is installed in below stove 11 and 12 at the bottom of driving terminal 18 drive.
Central automatic loading machine 13 is installed between high temperature furnace 11 and low temperature oven 12.Central authorities' automatic loading machine 13 has a filling place 21 and an electric hoist 20.Electric hoist can rotate on 360 ° the crane rail 19 at one and move forward and backward.This rotary crane rail 19 is suspended on the rotary connecting device 46, and is fixing by the rail bracket 49 that bearing 27 is housed.
A charging fork 22 is installed on electric hoist 20, and its size is coincide with basket formula charging pallet 35 and heat treatment station 37.Charging fork 22 and electric hoist 20 can arrive sky station 38 in a loading platform 41, the high temperature furnace 11 automatically, be installed in the modifier treatment station 44 and 45 of stove 11 and 12 outsides, sky station 38 and a discharging platform 42 in the low temperature oven 12 in charging circumference 34, and the basket formula that the part 23 of annealing will be housed pallet 35 shove charges of feeding.
For annealing part 23 and the atmosphere outside that contains oxygen are isolated, flame curtains jet pipe 32 and inert gas nozzle 33 are installed.Therefore when fire door 31 is opened when, upwards having formed from the bottom in the front of charging door 36 does not have the inert gas curtain represented equally among the flame curtains that not have expression the figure and the figure.The inert gas that uses mainly is a nitrogen, and flame curtains jet pipe 32 uses natural gas.
As shown in Figure 1, flame curtains jet pipe 32 be installed in charging door 36 below, and inert gas nozzle 33 is installed in the side of charging door 36, so that nozzle is tangentially blown nitrogen or another inert gas before charging door 36.
The fire door 31 of closing charging door 36 is installed in the vertical fire door guide rail 40, and can move up and down in guide rail.As shown in Figure 1, take off or put a basket formula charging pallet 35 in order to give high temperature furnace 11 with charging fork 22, fire door 31 can move up in vertical fire door guide rail 40.Meanwhile, light flame curtains jet pipe 32, open inert gas nozzle.So just, formed a barrier in the outside of charging door 36.At this moment, in circular tunnel 15, formed a kind of inert gas atmosphere of superpressure.Because superpressure, oxygen just can not enter in the continuous tunnel furnace.
When opening charging door 36 and put the basket formula charging pallet 35 of adorning cold annealing material 23 into, for fear of the temperature loss of each heat treatment station 37, several radially are installed in circular tunnel 15 type sealing (partition wall) 29.There is type sealing (partition wall) 29 to have type opening 30 is arranged, the external dimensions of opening and basket external dimensions basically identical of formula charging pallet 35.28 follow procedures rotate rhythmically at the bottom of rotary furnace, and in the time of the annealing chamber 43 of each heat treatment station 37 by circular tunnel 15, basket formula charging pallet 35 will be as sealing (partition wall) 29 sealings of dividing plate.
By type sealing (partition wall) 29 single annealing chamber spaced apart from each other 43 usefulness jet-flow heating tubes, 24 indirect are arranged.According to the requirement that metallurgy is handled, the temperature of each annealing chamber 43 can be the same, also can be different.When the annealing part when a heat treatment station 37 stops, in order to make annealing temperature equilibrium separately, the annealing part station that can forward or rotate backward.After heat treatment finishes, adorning the basket formula charging pallet 35 of heat treated metalwork 23 and taking off from last terminal station 39, this terminal station is at this moment just on the position at the sky station 38 of fire door 31 back.With central automatic loading machine 13 this basket formula charging pallet is put on the 1st the empty station 38 of low temperature oven 12 then.
Heat-treat and the tempering carried out in low temperature oven 12 subsequently and forming in the middle of the ferritic processing procedure at high temperature furnace 11, heat treated annealing part can carry out modifier treatment at modified station 44 and 45.Can water at modified station 44 and 45, quenching oil or air stream carry out modifier treatment.
After modifier treatment finished, central automatic loading machine 13 moved in the discharging platform 42 in charging circumference 34, and the annealing part that heat treatment is intact is put into to be waited on the discharging platform to transport.Central authorities' automatic loading machine 13 can be rotated further loading platform 41 beginning new one take turns charging.
As shown in Figure 2, are furnished with two loading platforms 41 for central automatic loading machine 13.On these two loading platforms, alternately put and fill the basket formula charging pallet 35 of preparing heat treated workpiece 23.Pallet can be put into respectively in stove 11 and the stove 12 subsequently.For with the pallet shove charge, the charging fork 22 that is fixed on the electric hoist 20 radially moves inwards, shifts to the charging door 36 of stove to be feeded 11 and 12 then on charging circumference 34.
Among Fig. 3 two couples of stove device 10a and 10b that vertically arrange.Each is formed by a high temperature furnace 11 and a low temperature oven 12 stove device 10a and 10b.At stove 11,11a, 12 and fire door 31 fronts of 12a a rail set 50 is arranged.As shown in Figure 4, vertically move on the rail set of charger 51 in workshop 52.
Stove device group 10a and 10b respectively have a common heating gas contact 53 and a nitrogen contact 54.Same common electric power system 55 in addition.Stove 11 and 12 respectively has a waste gas contact 56.
Heat treatment station just is located at fire door 31 places, and for example the air cooling stations 57.The annealing part that for ready for will heat-treat is provided with buffered station 58.Can do charging for basket formula charging pallet 35 at buffered station prepares.
As shown in Figure 4, the crane 20a that vertically walks on the crane runway 19 in workshop 52 can shift to whole stove device group 10a and 10b by an electric hoist 20.
Fig. 5 A to Fig. 5 D is described, is the loading method of giving stove 11 and 12 according to the present invention, the reciprocating type loading, unloading material of promptly so-called three insertions and one withdrawal.With the beginning of position shown in Fig. 5 A, before the fire door shown in the arrow 31 empty station L3, empty station L2 and L4 are in its both sides.Facing to direction of rotation 59, that nestle up empty station is terminal station E1 and E0; And along direction of rotation 59, against the sky station is B5 of loading terminal and B6.Each empty station " L " (Leerstation), terminal station " E " (Endstation) and loading terminal " B " (Beladestation) all consistent with 28 the part receiving platform 48 of annealing at the bottom of the rotary furnace.
Charging is shown in Fig. 5 B, and 28 draw back one and stand facing to direction of rotation 59 at the bottom of the rotary furnace, stand " 4 " just directly arrived the back of fire door 31 and feed.Therefore station " 4 " has become a B4 of loading terminal by an empty station L4.At the terminal station of high temperature E1 with just adorned punishment in advance and between the also very low B4 of loading terminal of temperature, two empty station L3 and L2 are arranged this moment.
Shown in Fig. 5 C, close fire door 31 after, 28 have rotated 3 stations forward along direction of rotation 59 at the bottom of the rotary furnace.Therefore the back of fire door 31 has just been arrived in the E1 position, and opening fire door 31 backs just can discharging.Terminal station E1 has become empty station L1 again like this.
Shown in Fig. 5 D, close fire door 31 after, 28 facing to direction of rotation 59 station of drawing back at the bottom of the rotary furnace.This space-time station L2 has moved on to the back of the fire door 31 of closing.Therefore between also low B4 of loading terminal of temperature and the new sky station L1 3 empty stations are arranged in charging just now, i.e. L1, L2 and L3.With respect to start bit Fig. 5 A, 28 have rotated a station forward along direction of rotation 59 at the bottom of the whole rotary furnace, feed again one and stand, station of discharging.More than by means of high temperature furnace 11 described loading, unloading material processes, also be like this in low temperature oven 12.
In annealing process, by this reciprocating type loading, unloading material method, guaranteed at new clothes enough temperature isolation district to be arranged all the time by 3 empty stations " L " process annealing material 23 on the 1st heat treatment station " B " and moving back between the fiery high annealing material 23 on terminal station " E " in the back.Therefore need not consume a lot of technology and design charges, for example design dividing plate, just can avoid influencing each other between cold bridge and other each annealing chamber 43 effectively.
10; 10a; 10b stove device group 11; 11a high temperature furnace 12; 12a 13 14 15 16 16a 17 18 19 20 20a 21 22 23 24 25,25a 26 27 28 29 ( ) 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59
Claims (10)
1, the heat-treatment furnace that metal works is heat-treated is by forming with the lower part: one is used for the ring-type circular tunnel stove of high-temperature region and/or the ring-type circular tunnel stove that is used for low-temperature space; One in continuous tunnel furnace at the bottom of the rotary furnace around its rotation, be divided into the annealing part receiving platform that several and heat treatment station adapt at the bottom of the rotary furnace, along with the rhythmic program of furnace bottom is rotated, each annealing part receiving platform all can be feeded, in addition, heat-treatment furnace also is equipped with separated partition wall at the bottom of the rotary furnace and the charging door that is used for loading, unloading annealing part that can cut out, the feature of this heat-treatment furnace is: partition wall (29) has one type opening (30) is arranged all the time, the profile basically identical of the shape of opening and annealing part (23); In first terminal station (39) of carrying heat treatment part (23) with carrying that regulation has 3 empty stations (38) between the loading terminal in back (37) of heat treated workpiece (23).
2, heat-treatment furnace according to claim 1 is characterized in that: be positioned at annealing part receiving platform (48) at the bottom of the rotary furnace that charging door (36) locates and two receiving platforms (48) of being adjacent constitute empty stand (38).
3, heat-treatment furnace as claimed in claim 1 or 2 is characterized in that: circular tunnel stove (11,12) is with jet-flow heating tube (24) or electricity consumption indirect.
4, heat-treatment furnace as claimed in claim 1 or 2, it is characterized in that: the charging door (36) of ring-type circular tunnel stove (11,12) is equipped with flame curtains jet pipe (32) and inert gas jet pipe (33).
5, heat-treatment furnace as claimed in claim 1 or 2, it is characterized in that: the circular tunnel stove (11 of several ring-types, 12) and the loading platform that is positioned at the stove outside (41) that matches with it, discharging platform (42) and modifier treatment station (44,45) all can carry out the loading, unloading material by a central charger (13).
6, heat-treatment furnace as claimed in claim 1 or 2, it is characterized in that: the relative arrangement with a low temperature oven (12) of a high temperature furnace (11) is installed, promptly the charging door of two stoves (36) is relative, central authorities' charger (13) are positioned in the middle of two stoves, so two stoves (11,12) all can feed incessantly, and interconnect by an isolation ward.
7, heat-treatment furnace as claimed in claim 1 or 2 is characterized in that: several high temperature furnaces (11,11a) and low temperature oven (12,12a) be arranged in together mutually, and can be enough a charger (51) that goes up walking at rail set (50) feed incessantly.
8, the method of in according to the heat-treatment furnace of one of claim 1 to 7, metal works being heat-treated, it is characterized in that: one of the centre that is arranged in 3 empty stations of position, top is located immediately at charging door, receiving platform of backward rotation at the bottom of the rotary furnace, this moment, first sky erect-position was in charging door, the workpiece that will be used for annealing is put on first empty station subsequently, to rotate 3 receiving platforms forward along rotation direction at the bottom of the rotary furnace then, at this moment first in should the receiving platform of discharging is positioned at the charging door discharging, when first moves back after the workpiece that overdoes takes out from continuous tunnel furnace, a receiving platform rotates backward at the bottom of the rotary furnace, have 3 empty erect-positions again in charging door this moment, one of centre during 3 skies are stood is adjacent in the back of charging door, faces charging door.
9, method as claimed in claim 8 is characterized in that: the annealing part in the stop process of a heat treatment station, for balanced annealing temperature, can be forward or the width of the receiving platform that rotates backward.
10, method as claimed in claim 8 or 9 is characterized in that: heat-treatment furnace can use a kind of protective gas annealing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4303686A DE4303686C2 (en) | 1992-10-07 | 1993-02-09 | Furnace plant and method for the heat treatment of metallic workpieces |
| DEP4303686.4 | 1993-02-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1091821A CN1091821A (en) | 1994-09-07 |
| CN1060562C true CN1060562C (en) | 2001-01-10 |
Family
ID=6479950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94101085 Expired - Fee Related CN1060562C (en) | 1993-02-09 | 1994-01-21 | Heat treatment furnaces and process for heat treatment of metal workpiece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1060562C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014257B (en) * | 2012-12-12 | 2014-11-26 | 肇庆宏旺金属实业有限公司 | Continuous annealing furnace |
| CN105214919B (en) * | 2015-10-10 | 2017-09-05 | 厦门市英泰尔工贸有限公司 | Efficient industrial baking oven |
| CN107101497B (en) * | 2017-06-19 | 2022-07-01 | 中南大学 | High-low temperature double-body vacuum hot-pressing sintering furnace |
| CN113046521A (en) * | 2021-03-29 | 2021-06-29 | 杭州汽轮铸锻有限公司 | Corrosion-resistant treatment device and treatment process for stainless steel compressor screw |
-
1994
- 1994-01-21 CN CN 94101085 patent/CN1060562C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1091821A (en) | 1994-09-07 |
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