CN206351234U - Shell mould sintering equipment - Google Patents
Shell mould sintering equipment Download PDFInfo
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- CN206351234U CN206351234U CN201720002270.5U CN201720002270U CN206351234U CN 206351234 U CN206351234 U CN 206351234U CN 201720002270 U CN201720002270 U CN 201720002270U CN 206351234 U CN206351234 U CN 206351234U
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Abstract
The utility model discloses a kind of shell mould sintering equipment, belong to precision casting technology field.The shell mould sintering equipment includes intracavitary in sintering inner chamber, sintering and is provided with shell mould placement platform, and shell mould sintering equipment is electrothermal furnace, and the upper surface of shell mould placement platform is provided with multiple rows of groove, length direction extension of the groove along sintering inner chamber；Intracavitary is provided with the first air inlet pipe for providing air in sintering, and the first air inlet pipe, which is connected with air-blast device, the first air inlet pipe, is provided with first jet of the direction towards groove；Intracavitary is additionally provided with the second nozzle for providing imflammable gas or liquid in sintering；The height of exhanst gas outlet is higher than the height of shell mould placement platform.The utility model can greatly shorten the time for burning the wax stage, and to be changed into hypoxemia or oxygen-free environment from hyperoxia as early as possible in sintering furnace after in the burning wax stage terminating, the carbon dust added in shell mould is not burned consumption, it is ensured that the quality of shell mould, so as to improve the quality of casting.
Description
Technical field
The utility model is related to precision casting process, more particularly to a kind of shell mould sintering equipment.
Background technology
Hot investment casting is a kind of casting method for conventional casting techniques, and it results in relatively accurate shape
Shape and higher casting accuracy.The technical process of hot investment casting is：First, wax-pattern, the wax-pattern and the product of required casting are made
Size shape is consistent；Then, in made wax pattern surface formation pottery shell；Then, carrying out dewaxing treatment to the pottery shell (will
Removed after its internal wax-pattern fusing)；Afterwards, pottery shell is sintered at high temperature；Finally, the casting metal material into the pottery shell after sintering
Material, the pottery shell is removed after after metal material cooled and solidified, crushing, and obtained casting is required product.
In above-mentioned technical process, the making for shell of making pottery is most important, and its quality determines the quality of casting.Mesh
Before, pottery shell make the method that generally uses for：Shell moulding, specifically frequently with aqueous silica sol shell process, this method is in system
To prepare different slurries and sand using refractory material when making pottery shell, one layer of slurry, one layer of sand gradually from level to level be accumulated in wax-pattern
Surface, the pottery shell of thickness required for being made.Then, obtained pottery shell is dried, dewaxed and is put into sintering furnace in 900~1400
High temperature sintering at DEG C.Because sintering is that shell molding makees an essential step link, therefore, the quality of sintering directly influences shell
Mould quality, and final casting quality.
The earlier application CN105903898A of inventor discloses a kind of shell mould sintering method and the sintering using this method
Device, it uses Segmented heating method, and shell mould sintering process has been divided into burning wax stage and sintering stage, burns the guarantee of wax stage
Sintered ring has the oxygen of abundance and wax to carry out abundant combustion reaction within the border so that there's almost no in obtained shell mould because residual wax carbon
Change the carbon residue formed, it is to avoid the problem of molten steel expulsion problem and casting penetrating property stomata during the cast therefore produced.Together
When, in sintering stage the domestic oxygen concentration of sintered ring is reduced as far as possible, it is to avoid the carbon dust in shell mould is just complete in sintering stage
It has been burnt that, serious die wall reacting phenomenon occurs when causing shell mould pour steel.
Inventor has found that the earlier application is asked there are still following to a certain extent in further research process
Topic：
1st, the wax stage (it is required that hyperoxia low temperature) is being burnt, it is maintained in the oxygen content (i.e. hyperoxia) for having abundance in sintering furnace, stove
Temperature is 600 DEG C~800 DEG C (belonging to low temperature for sintering temperature), is held time as 5~20min, on this condition,
Because oxygen content is sufficient, in-furnace temperature is higher and it is longer to hold time, so the carbon dust added in shell mould is it is possible to part
It is burned to consume, so as to reduce protective effect of the carbon dust to shell mould, die wall reaction can still occur to a certain extent；
2nd, at sintering stage (it is required that low-oxygen high-temperature), it is controlled by way of closing air-blast device and air draft flue
It is hypoxemia or oxygen-free environment in sintering furnace, but at the end of the wax stage is burnt, because the oxygen content in sintering furnace is still in higher
Level, the oxygen of these residuals still may proceed to consume the carbon dust added in shell mould in sintering stage, further reduce carbon dust pair
The protective effect of shell mould, adds die wall reaction odds.
In addition, in the continuous production of shell mould, after the first furnace shell mould takes out from sintering furnace, in-furnace temperature about exists
900 DEG C or so, when being put into the second furnace shell mould, in-furnace temperature still can be higher, when carrying out burning wax to the second furnace shell mould, once shell
Mould temperature is raised, under oxygen environment, and the carbon dust added in shell mould is possible to start by burning consumption successively, so having
It is necessary to shorten the time (time for shortening hyperoxia) for burning the wax stage, and cause as far as possible after terminating in the burning wax stage in sintering furnace
Hypoxemia or oxygen-free environment are changed into from hyperoxia as early as possible, to reduce the consumption of the carbon dust added in shell mould.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of shell mould sintering equipment, and it can greatly shorten burning wax rank
The time of section, and to be changed into hypoxemia or oxygen-free environment from hyperoxia as early as possible in sintering furnace after in the burning wax stage terminating, reduce shell
The consumption of the carbon dust added in mould.
In order to solve the above technical problems, the utility model offer technical scheme is as follows：
On the one hand there is provided a kind of shell mould sintering equipment, including sintering inner chamber, intracavitary is provided with the placement of shell mould in the sintering
Platform and heater, one end of the sintering inner chamber are provided with closing door, and the other end of the sintering inner chamber is provided with flue gas
Outlet, the exhanst gas outlet is connected with air draft flue, wherein：
The shell mould sintering equipment is electrothermal furnace, and the upper surface of the shell mould placement platform is provided with multiple rows of groove, described
Length direction extension of the groove along the sintering inner chamber, the width of the groove is less than the diameter of the sprue cup of shell mould to be sintered；
The sintering inner chamber is set on the inside of one end of the exhanst gas outlet in the position corresponding with the shell mould placement platform
The first air inlet pipe being equipped with for providing air is installed, first air inlet pipe is connected with air-blast device, first air inlet pipe
On be provided with direction towards the first jet of the groove；
Intracavitary is additionally provided with the second nozzle for providing imflammable gas or liquid in the sintering；
The height of the exhanst gas outlet is higher than the height of the shell mould placement platform.
Further, the sintering inner chamber set on the inside of one end of the exhanst gas outlet with the shell mould placement platform phase
Corresponding position is additionally provided with the second air inlet pipe for providing imflammable gas or liquid, and the second nozzle is located at described the
In two air inlet pipe and direction is towards the groove.
Further, some deep beads are evenly arranged with the middle part of at least one side wall of the groove, each deep bead
Direction of the length along the sintering inner chamber from the inside to the outside is elongated successively.
Further, the end of the deep bead is arc air inducing portion.
Further, tilted backwards along deep bead top described in the direction from the inside to the outside of the sintering inner chamber, inclined angle
Spend for 1-10 °.
Further, the sintering inner chamber is set on the inside of one end of the closing door relative with the shell mould placement platform
The position answered is provided with knockout collecting tank, width extension of the knockout collecting tank along the sintering inner chamber.
Further, it is provided between the exhanst gas outlet and air draft flue in after-burning stove, the after-burning stove
It is provided with the 3rd nozzle for providing air and the 4th nozzle for providing imflammable gas or liquid, the exhanst gas outlet
For towards the contraction structure of the after-burning stove.
Further, the temperature in the after-burning stove is more than 1200 DEG C, and the oxygen content of the after-burning stove is
More than 25%.
Further, the air draft flue junction is being provided with the filtering of ceramic sponge formula in the after-burning stove
Device.
Further, first air inlet pipe is connected with metal preheating pipeline, and the metal preheating pipeline is arranged on described
In after-burning stove.
Further, intracavitary is provided with temperature sense module and oxygen concentration monitoring modular in the sintering.
On the other hand there is provided a kind of method that shell mould sintering is carried out using above-mentioned shell mould sintering equipment, including：
Step 1：Shell mould back-off to be sintered is placed in sintering on the shell mould placement platform of intracavitary, closing door is closed；
Step 2：Heater, air-blast device and air draft flue are opened, intracavitary in sintering is had sufficient oxygen content, heating
To the ignition temperature of shell mould wax, and maintain to sinter interior cavity temperature until the wax completely burnout of the residual in shell mould；
Step 3：Nozzle is opened, it is hypoxemia or oxygen-free environment to make intracavitary in sintering, is warming up to the sintering temperature and dimension of shell mould
The sintering temperature that cavity temperature in sintering is shell mould is held, until shell mould sintering is finished.
Further, in the step 2, when the oxygen content for detecting intracavitary in the sintering is not reduced within a certain period of time
When, go to the execution step 3.
Further, in the step 2, heater, air-blast device and air exhausting device is opened, makes the sintering inner chamber
Oxygen content is 16~20%；In the step 3, nozzle is opened, makes the oxygen content of the sintering inner chamber below 5%.
Further, in the step 2, the ignition temperature of the shell mould wax is 600 DEG C~800 DEG C, described to maintain to burn
Knot in-furnace temperature is held time as within 3min；In the step 3, the sintering temperature of the shell mould is 1150~1400 DEG C,
It is described to maintain sintering in-furnace temperature to hold time as 10~30min.
The utility model has the advantages that：
The utility model have adjusted the direction of shell mould placement platform upper groove, and reasonable Arrangement is used to providing the of air
The position of one nozzle so that sintering can form circulating current in inner chamber, improve the efficiency of heating surface, and the position of first jet
It is designed to drive inside shell mould and forms air-flow, can is the next enough oxygen of wax combustion zone burning the wax stage, enable wax
Faster burn, so as to greatly shorten the time for burning the wax stage；The utility model is also provided with sintering inner chamber
Nozzle, after the burning wax stage terminates, the nozzle can spray imflammable gas or liquid, be consumed by burning in sintering inner chamber
Oxygen, so as to reach the purpose of oxygen content in rapid reduction sintering inner chamber so that after terminating in the burning wax stage in sintering furnace as early as possible
Hypoxemia or oxygen-free environment are changed into from hyperoxia.In the continuous production of shell mould, the utility model also ensures that institute in shell mould
The carbon dust of addition is not burned consumption, it is ensured that the quality of shell mould, so as to improve the quality of casting.Using the utility model
The sufficiently high casting of precision can be produced so that subsequently or need not only need less finishing to can reach the casting essence of needs
Degree, reduces substandard products, percent defective, improves production efficiency, greatly reduce production cost.
Brief description of the drawings
Fig. 1 is the structural representation of one embodiment of shell mould sintering equipment of the present utility model；
Fig. 2 is shell mould placement platform A-A profile structure diagram in Fig. 1；
Fig. 3 is a kind of overlooking the structure diagram of frame mode of a groove of shell mould placement platform in Fig. 1；
Fig. 4 is the overlooking the structure diagram of another frame mode of a groove of shell mould placement platform in Fig. 1；
Fig. 5 is the positive structure schematic of the side wall with deep bead of groove shown in Fig. 3；
Fig. 6 is the structural representation of another embodiment of shell mould sintering equipment of the present utility model；
Fig. 7 is the schematic flow sheet of shell mould sintering method of the present utility model.
Embodiment
To make the technical problems to be solved in the utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing
And specific embodiment is described in detail.
On the one hand, the utility model provides a kind of shell mould sintering equipment, as Figure 1-5, including sintering inner chamber 1, sintering
Shell mould placement platform 2 and heater (not shown) are provided with inner chamber 1, one end of sintering inner chamber 1 is provided with closing door 3, burnt
The other end of knot inner chamber 1 is provided with exhanst gas outlet 4, and exhanst gas outlet 4 is connected with air draft flue 5, wherein：
Shell mould sintering equipment is electrothermal furnace, and the upper surface of shell mould placement platform 2 is provided with multiple rows of groove 21, and groove 21 is along burning
Length direction (i.e. left and right directions in Fig. 1) extension of inner chamber 1 is tied, the width of groove 21 is less than the sprue cup 8 of shell mould to be sintered
Diameter；
Sintering inner chamber 1 sets and the position corresponding with shell mould placement platform 2 is provided with use on the inside of one end of exhanst gas outlet 4
In the first air inlet pipe 6 for providing air, the first air inlet pipe 6 is connected with air-blast device (not shown), the first air inlet pipe 6 and is provided with
First jet 61 of the direction towards groove 21；
The second nozzle for providing imflammable gas or liquid (such as gas, alcohol) is additionally provided with sintering inner chamber 1
71；
The height of exhanst gas outlet 4 is higher than the height of shell mould placement platform 2, and in general difference in height can be 5-20cm, this
Art personnel can also be adjusted flexibly according to actual conditions.
Inventor has found that sintering furnace is broadly divided into two kinds in the prior art in research process, and the first is electrothermal furnace, its
Shortcoming is：1st, heated by the electrothermal tube in stove in three side arrangements, only heat radiation is heated, and heat is uneven, efficiency
It is not good；2nd, electrothermal furnace is mostly closed, and stuffy without convection current, oxygen content is inadequate, it is difficult to provide the hyperoxia burnt needed for the wax stage
Environment；Second is combustion gas/oil burner, and its shortcoming is：Although the 1, there is ventilating convection, due to being to rely on combustion gas/fuel oil to come
Heating, consumes most of oxygen, therefore is also frequently present of and burns the not enough defect of wax stage oxygen content；If the 2, increasing oxygen-supplying amount
Words, then be easily caused the carbon dust that is added in shell mould and be burned and consume again in sintering stage.
The beneficial effects of the utility model are：
1st, on the basis of existing electrothermal furnace, and the earlier application of inventor is combined, have adjusted the fovea superior of shell mould placement platform 2
The direction of groove 21, and reasonable Arrangement is used for the position that provides the first jet 61 of air so that sintering can be formed in inner chamber 1
Circulating current, improves the efficiency of heating surface, is described as follows：
Air-blast device is introduced on electrothermal furnace, the air in stove can be stirred, electrothermal furnace is solved and there was only heat radiation, efficiency
Not good shortcoming, because air blast stirs the air in stove, creates the optimal heat transfer condition of thermal convection current, heat transfer and heat radiation, fills
Divide and the hot Quick uniform of electrothermal tube is passed on shell mould, the increase efficiency of heating surface saves the energy, shortens the time needed for sintering, increases
Production efficiency；
Arrow represents air current flow direction in each figure.Circulating current direction such as Fig. 1 institutes formed in the utility model
Show, the utility model is for the earlier application of inventor, and airflow direction is more reasonable, and the efficiency of heating surface is higher.
Moreover, length direction of the groove 21 along sintering inner chamber 1 extends, this setup is conducive to produce in sintering process
Raw peeling comes out (both beneficial to artificial sand removal, also beneficial to the utilization automatic sand removal of air intake air-flow).
2nd, in the utility model, direction is provided with towards the first of groove 21 in the first air inlet pipe 6 for providing air
Nozzle 61, because shell mould back-off to be sintered is placed on shell mould placement platform 2, is placed exactly in the top of groove 21, so with
The flowing of the charge air flow of first jet 61, can be driven inside shell mould and form air-flow, be advantageous in that：One is to burn the wax stage
Enough oxygen can be carried out for wax combustion zone, wax has faster been burnt, two be that can reduce shell mould in sintering stage
Internal-external temperature difference (in the utility model shell mould internal-external temperature difference can as little as 5 DEG C within), so as to avoid due to caused by internal-external temperature difference
The problem of swell increment difference hair check can occur on shell mould inside and outside shell mould in sintering process, and then avoid the surface of casting
The problem of producing outstanding flash or convex water wave/recessed water wave；
3rd, the width of groove 21 is less than the diameter of the sprue cup 8 of shell mould to be sintered, so shell mould can be made smoothly to place
On shell mould placement platform 2, do not slide/skew in groove 21, so that the knockout dropped in sintering process will not be adhered to, it is ensured that
Casting will not produce husky hole；
4th, sintering inner chamber 1 is provided with the second nozzle 71 for providing imflammable gas or liquid, terminates in the burning wax stage
Afterwards, the second nozzle 71 can spray imflammable gas or liquid, the oxygen in sintering inner chamber 1 be consumed by burning, so as to reach
The purpose of oxygen content into rapid reduction sintering inner chamber 1.
To sum up, the utility model have adjusted the direction of shell mould placement platform upper groove, and reasonable Arrangement is used to providing sky
The position of the first jet of gas so that sintering can form circulating current in inner chamber, improve the efficiency of heating surface, and first jet
Position Design can be driven inside shell mould and form air-flow, can carry out enough oxygen for wax combustion zone burning the wax stage, make
Wax can faster burn, so as to greatly shorten the time for burning the wax stage；The utility model is also in sintering inner chamber
Nozzle is provided with, after the burning wax stage terminates, the nozzle can spray imflammable gas or liquid, is consumed by burning in sintering
Oxygen in chamber, so as to reach the purpose of oxygen content in rapid reduction sintering inner chamber so that sintering furnace after terminating in the burning wax stage
Hypoxemia or oxygen-free environment are inside changed into from hyperoxia as early as possible.In the continuous production of shell mould, the utility model also ensures that shell
The carbon dust added in mould is not burned consumption, it is ensured that the quality of shell mould, so as to improve the quality of casting.Using this reality
The sufficiently high casting of precision can be produced with new so that subsequently or need not only need less finishing to can reach needs
Casting accuracy, reduces substandard products, percent defective, improves production efficiency, greatly reduce production cost.
As shown in Figure 1, it is preferred that sintering inner chamber 1 set exhanst gas outlet 4 one end on the inside of with the phase of shell mould placement platform 2
Corresponding position is additionally provided with the second air inlet pipe 7 for providing imflammable gas or liquid, and second nozzle 71 enters positioned at second
On tracheae 7 and direction is towards groove 21.
The Position Design (direction towards groove 21) of the second nozzle 71 can make groove 21 turn into quirk so that it can
Oxygen outside shell mould is quickly consumed, also directly the oxygen inside shell mould can quickly be consumed, be further increased and remove
The speed of oxygen.And as remained in shell mould because not completely out wax be carbonized under high-temperature low-oxygen environment formed it is residual
Carbon, then this Position Design of second nozzle 71 can also blow away the carbon residue, so as to improve the quality of shell mould.
In the utility model, the groove 21 on shell mould placement platform 2 can be variously-shaped, such as U-shaped, trapezoidal, triangle
Deng, embodiment illustrated in fig. 2 is triangular groove, in the embodiment, for increase knockout saturation, the bottom of groove is also additionally arranged
Semi-cylindrical canyon 24.
As Figure 2-3, the middle part of at least one side wall of groove 21 is perfectly even provided with some deep beads 22, each gear
Direction of the length of aerofoil 22 along sintering inner chamber 1 from the inside to the outside is elongated successively, it is seen in figure 3 that closer to left side (sintering
The direction of closing door 3 of inner chamber 1), the length of deep bead is longer.Such to be advantageous in that, when charge air flow flows through, deep bead can
To keep off and be introduced in the sprue cup of the shell mould of top a part of windage, the throughput in shell mould is increased.In order to
Blower effect is improved, as shown in figure 3, the end of deep bead 22 can be arc air inducing portion 221.
It should be noted that deep bead 22 is arranged on the middle part of the side wall of groove 21, lower end is not extended downwardly, such air inlet gas
Stream still can be along whole groove flowing underneath, so as to which the knockout dropped in sintering process is blown out to closing door side.Such as Fig. 2 institutes
Show, the height of each deep bead can be with identical, and only length is different.In addition, deep bead can have both been designed in a side of groove
On wall (as shown in Figure 3), it can also design on two side walls of groove (as shown in Figure 4).It is understood that groove and gear
The design parameters such as the size and number of aerofoil, those skilled in the art can flexibly set according to actual needs, herein no longer
Citing is repeated.
As shown in Figure 5, it is preferred that tilted backwards along the top of direction deep bead 22 of sintering inner chamber 1 from the inside to the outside, it is inclined
Angle (i.e. the angle of deep bead and vertical direction) α can be 1-10 °.So, there will be more wind to be connect to introduce in shell mould
Portion, further increases the throughput in shell mould.
In the utility model, sintering inner chamber 1 is set on the inside of one end of closing door 3 corresponding with shell mould placement platform 2
Position is preferably provided with knockout collecting tank 9, and width of the knockout collecting tank 9 along sintering inner chamber 1 extends, in order to periodic collection
Knockout.When sintering equipment is shut down, it can also be entered by means of air-blast device strength air-supply by the first air inlet pipe and first jet
Row blast, the knockout in groove is blown in knockout collecting tank, is cleared up with facilitating to concentrate.
As further improvement of the utility model, as shown in fig. 6, being provided with two between exhanst gas outlet 4 and air draft flue 5
Be provided with secondary combustion furnace 10, after-burning stove 10 the 3rd nozzle 11 for providing air and for provide imflammable gas or
4th nozzle 12 of liquid, exhanst gas outlet 4 is the contraction structure towards after-burning stove 10.
During wax is burnt, black smoke is easily produced, this is due to that burning is insufficient, and charcoal ash powder is mingled with flue gas to be caused
, the environment that the after-burning stove can provide the sufficient oxygen of high temperature consumes the charcoal ash powder being mingled with so as to burn, it is to avoid black smoke, makes
Obtain the flue gas finally discharged and meet environmental requirement., then can be effective and exhanst gas outlet is the contraction structure towards after-burning stove
Avoid influenceing the quality of shell mould into sintering inner chamber with oxygen stream blowback in after-burning stove.
It is preferred that, the after-burning stove 10 is high temperature oxygen environment, and preferably its interior temperature is more than 1200 DEG C, and oxygen content is
More than 25%.Further, the junction of air draft flue 5 is being provided with ceramic sponge formula filter 13 in after-burning stove 10,
To adsorb the charcoal ash powder for not being in time for burning, because the ceramic sponge formula filter 13 is located in after-burning stove 10, so by
The charcoal ash powder of absorption can still burn under the high temperature oxygen environment of after-burning stove 10 later is changed into gas discharge.
In the utility model, because the first air inlet pipe 6 is that extraneous air is introduced into sintering inner chamber 1, to avoid outdoor sky
Gas brings the adverse effect of cooling, it is preferred that the first air inlet pipe 6 is connected with metal preheating pipeline (not shown), metal preheating
Pipeline can use metal coil pipe, and metal preheating pipeline can be arranged in after-burning stove 10, to make full use of in stove
Waste heat.In addition, temperature sense module and oxygen concentration monitoring modular are preferably provided with sintering inner chamber 1, to monitor stove inside information in real time
Condition, and controlled accordingly in time.
On the other hand, the utility model also provides a kind of side that shell mould sintering is carried out using above-mentioned shell mould sintering equipment
Method, as shown in fig. 7, comprises：
Step S1：Shell mould back-off to be sintered is placed in sintering on the shell mould placement platform of intracavitary, closing door is closed；
Step S2：Heater, air-blast device and air draft flue are opened, intracavitary in sintering is had sufficient oxygen content, rises
The warm ignition temperature to shell mould wax, and maintain to sinter interior cavity temperature until the wax completely burnout of the residual in shell mould；
Because when oxygen content is 16.5%, charcoal more can sufficiently burn, therefore herein preferably by controlling air blast to fill
Put with air draft flue, make the oxygen content of sintering inner chamber 16~20%；Shell mould is preferably 600 DEG C~800 with the ignition temperature of wax
DEG C, maintain holding time as within 3min for sintering in-furnace temperature.
Step S3：Nozzle is opened, it is hypoxemia or oxygen-free environment to make intracavitary in sintering, is warming up to the sintering temperature and dimension of shell mould
The sintering temperature that cavity temperature in sintering is shell mould is held, until shell mould sintering is finished.
In this step, open after nozzle, nozzle sprays imflammable gas or liquid, consumed by burning in sintering inner chamber
Oxygen, so that the purpose of oxygen content in rapid reduction sintering inner chamber is reached, to realize hypoxemia or oxygen-free environment；And it is warming up to shell
The sintering temperature of mould is realized by the electrothermal tube of electrothermal furnace itself.Relative to earlier application, the utility model does not close drum
Wind apparatus and air draft flue (only need the high-temperature low-oxygen fitness of environment according to required by sintering stage to adjust air-blast device and air draft cigarette
The unlatching size in road) so that intracavitary is still formed with circulating current in sintering, the air in stove can be stirred, is maintained
The higher efficiency of heating surface.
In this step, hypoxemia refers to the oxygen content for sintering inner chamber below 5%.The sintering temperature of shell mould can for 1150~
1400 DEG C, it can be 10~30min to maintain holding time for in-furnace temperature of sintering.
Because intracavitary has air-flow is also formed with circulating current, sprue cup in sintering of the present utility model, therefore this practicality is new
Type can in the short period of time (within 3min) by the complete burn off of wax, and can make in 1min in sintering inner chamber oxygen content from
16-20% is reduced to less than 5%, (10~30min) can also finish shell mould sintering in the short period of time.For general
Shell mould, prior art, which usually requires more than 45min, could complete whole sintering process, and can also exist such as earlier application and this
Many defects mentioned in the background skill of case；And the utility model can then complete sintering in 20min, and it ensure that shell
The quality of mould, improves the quality of casting.
Inventor is in research process it has furthermore been found that because sintering process is divided into burning wax stage and sintering stage, burning wax
Stage keeps low temperature hyperoxia, and sintering stage keeps high-temperature low-oxygen, and two stages are accurate, be switched fast and just can ensure that final shell mould
Quality, so the timing of switching is extremely important.In this regard, inventor's research is found, preferably in step 2, when detecting burning
(now illustrate that the wax of residual in shell mould has burnt when the oxygen content of intracavitary is not reduced (such as in 3-5s) within a certain period of time in knot
Finish, oxygen is no longer consumed in sintering inner chamber), execution step 3 is gone to, starts sintering stage.The switching is accurate, does not judge by accident.
Described above is preferred embodiment of the present utility model, it is noted that for the ordinary skill of the art
For personnel, on the premise of principle described in the utility model is not departed from, some improvements and modifications can also be made, these improvement
Protection domain of the present utility model is also should be regarded as with retouching.
Claims (10)
1. intracavitary is provided with shell mould placement platform in a kind of shell mould sintering equipment, including sintering inner chamber, the sintering and heating is filled
Put, one end of the sintering inner chamber is provided with closing door, and the other end of the sintering inner chamber is provided with exhanst gas outlet, the flue gas
Outlet is connected with air draft flue, it is characterised in that
The shell mould sintering equipment is electrothermal furnace, and the upper surface of the shell mould placement platform is provided with multiple rows of groove, the groove
Extend along the length direction of the sintering inner chamber, the width of the groove is less than the diameter of the sprue cup of shell mould to be sintered；
The sintering inner chamber sets and set on the inside of one end of the exhanst gas outlet in the position corresponding with the shell mould placement platform
The first air inlet pipe for providing air is equipped with, first air inlet pipe is connected with air-blast device, first air inlet pipe and set
Direction is equipped with towards the first jet of the groove；
Intracavitary is additionally provided with the second nozzle for providing imflammable gas or liquid in the sintering；
The height of the exhanst gas outlet is higher than the height of the shell mould placement platform.
2. shell mould sintering equipment according to claim 1, it is characterised in that the sintering inner chamber sets the exhanst gas outlet
One end on the inside of be additionally provided with the position corresponding with the shell mould placement platform for providing imflammable gas or liquid
Second air inlet pipe, the second nozzle is located in second air inlet pipe and direction is towards the groove.
3. shell mould sintering equipment according to claim 1, it is characterised in that the middle part of at least one side wall of the groove
It is evenly arranged with some deep beads, the direction of the length of each deep bead along the sintering inner chamber from the inside to the outside is elongated successively.
4. shell mould sintering equipment according to claim 3, it is characterised in that the end of the deep bead is arc air inducing
Portion.
5. shell mould sintering equipment according to claim 4, it is characterised in that along the direction of the sintering inner chamber from the inside to the outside
The deep bead top is tilted backwards, and inclined angle is 1-10 °.
6. shell mould sintering equipment according to claim 1, it is characterised in that the sintering inner chamber sets the closing door
Knockout collecting tank is provided with the inside of one end in the position corresponding with the shell mould placement platform, the knockout collecting tank is described in
Sinter the width extension of inner chamber.
7. according to any described shell mould sintering equipment in claim 1-6, it is characterised in that the exhanst gas outlet and air draft cigarette
It is provided between road and the 3rd nozzle for providing air is provided with after-burning stove, the after-burning stove and for providing
4th nozzle of imflammable gas or liquid, the exhanst gas outlet is the contraction structure towards the after-burning stove.
8. shell mould sintering equipment according to claim 7, it is characterised in that the temperature in the after-burning stove is 1200
More than DEG C, the oxygen content of the after-burning stove is more than 25%.
9. shell mould sintering equipment according to claim 7, it is characterised in that in the after-burning stove with the air draft
Flue junction is provided with ceramic sponge formula filter.
10. shell mould sintering equipment according to claim 7, it is characterised in that it is pre- that first air inlet pipe is connected with metal
Pipe line, the metal preheating pipeline is arranged in the after-burning stove.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720002270.5U CN206351234U (en) | 2017-01-03 | 2017-01-03 | Shell mould sintering equipment |
| TW106201726U TWM545002U (en) | 2017-01-03 | 2017-02-03 | Shell mold sintering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720002270.5U CN206351234U (en) | 2017-01-03 | 2017-01-03 | Shell mould sintering equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206351234U true CN206351234U (en) | 2017-07-25 |
Family
ID=59349180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720002270.5U Expired - Fee Related CN206351234U (en) | 2017-01-03 | 2017-01-03 | Shell mould sintering equipment |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN206351234U (en) |
| TW (1) | TWM545002U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106734883A (en) * | 2017-01-03 | 2017-05-31 | 蔡政达 | Shell mould sintering equipment and method |
-
2017
- 2017-01-03 CN CN201720002270.5U patent/CN206351234U/en not_active Expired - Fee Related
- 2017-02-03 TW TW106201726U patent/TWM545002U/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106734883A (en) * | 2017-01-03 | 2017-05-31 | 蔡政达 | Shell mould sintering equipment and method |
| WO2018126502A1 (en) * | 2017-01-03 | 2018-07-12 | 蔡欲期 | Shell mold sintering device and method |
| CN106734883B (en) * | 2017-01-03 | 2018-10-02 | 蔡耀名 | Shell mold sintering equipment and method |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM545002U (en) | 2017-07-11 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170725 Termination date: 20200103 |
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| CF01 | Termination of patent right due to non-payment of annual fee |