CN114082884B - Production process of lost foam casting plate - Google Patents
Production process of lost foam casting plate Download PDFInfo
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- CN114082884B CN114082884B CN202111372952.2A CN202111372952A CN114082884B CN 114082884 B CN114082884 B CN 114082884B CN 202111372952 A CN202111372952 A CN 202111372952A CN 114082884 B CN114082884 B CN 114082884B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- 238000010114 lost-foam casting Methods 0.000 title claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 77
- 238000005187 foaming Methods 0.000 claims abstract description 73
- 239000011324 bead Substances 0.000 claims abstract description 56
- 238000007493 shaping process Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000032683 aging Effects 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000011049 filling Methods 0.000 claims abstract description 6
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 21
- 238000005266 casting Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 6
- 238000005245 sintering Methods 0.000 abstract description 6
- 238000000465 moulding Methods 0.000 description 14
- 239000006260 foam Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- 208000029152 Small face Diseases 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000010115 full-mold casting Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
- B22C7/023—Patterns made from expanded plastic materials
Abstract
The application relates to the technical field of lost foam casting, in particular to a production process of lost foam casting plates, which comprises the following steps: s1, selecting samples; s2, pre-foaming; s3, curing; s4, forming, namely preheating a die to 85-100 ℃, and then adding cured pattern beads into the die for filling; introducing steam for heating after vacuumizing, wherein four times of steam heating are performed in total, and the four times of steam heating are performed from four different heating surfaces which are four large surfaces of the plate respectively; s5, shaping, namely starting vacuum when an expansion point generated by the penetrating pressure of steam reaches a set value in the shaping process, and cooling and shaping through vacuum negative pressure; until the pressure inside the die reaches the pressure stabilizing, then closing the vacuum, and opening the die to eject the plate; s6, aging. The method has the effect of improving the performances of the plate, such as density, density uniformity, sintering property and the like.
Description
Technical Field
The application relates to the technical field of lost foam casting, in particular to a production process of lost foam casting plates.
Background
The lost foam casting (also called full mold casting) is a novel casting method which is to combine foam models with similar sizes and shapes as castings into model clusters by bonding, brush refractory coating, dry, then embed in dry quartz sand for vibration molding, pour under negative pressure to gasify the models, occupy the model positions by liquid metal, solidify and cool to form castings.
Compared with the traditional casting technology, the lost foam casting is considered to be a green revolution of the casting industry because of the advantages of high surface smoothness, accurate size and shape of the obtained casting by adopting EPS, EPMMA, stMMA or StMMA-FD foam beads which are extremely easily gasified at high temperature as a pattern.
The quality of the lost foam is closely related to the density, density uniformity, sintering property and other properties of the plate formed after the lost foam is foamed.
Disclosure of Invention
In order to improve the quality of lost foam casting plates, the application provides a production process of lost foam casting plates.
The application provides a production process of lost foam casting plates, which adopts the following technical scheme: a production process of lost foam casting plates comprises the following steps:
s1, selecting a sample, and selecting a model bead with a corresponding diameter range according to casting requirements;
s2, pre-foaming, namely heating the pattern beads by using steam, and stirring the pattern beads to expand the pattern beads to finish foaming;
s3, curing, namely ventilating and curing the pre-foamed pattern beads;
s4, forming, namely preheating a die, and then adding cured pattern beads into the die for filling; introducing steam for heating after vacuumizing, wherein four times of steam heating are performed in total, and the four times of steam heating are performed from four different heating surfaces which are four large surfaces of the plate respectively;
s5, shaping, namely starting vacuum when an expansion point generated by the penetrating pressure of steam reaches a set value in the shaping process, and cooling and shaping through vacuum negative pressure; until the pressure inside the die reaches the pressure stabilizing, then closing the vacuum, and opening the die to eject the plate;
s6, aging, and standing the formed plate for volatilization treatment.
By adopting the technical scheme, the bead with the proper diameter is selected according to the casting, then the casting is molded after pre-foaming and curing, the molding time is shortened by preheating during molding, and simultaneously, the molding quality and the condensate water in the mold cavity during molding can be high.
And then four times of heating are respectively carried out on four different heating surfaces, so that the heating uniformity can be effectively ensured, and the performances of density, density uniformity, sintering property and the like of the formed plate after foaming are effectively improved. And then shaping is carried out by vacuum negative pressure, and when cooling, the phenomenon that the surface layer is cooled, solidified and shaped and the temperature of the core part is high often occurs because the model bubble body is a hot poor conductor. If cooling and shaping are insufficient, a large amount of heat of the core part is continuously transmitted outwards although the skin layer is solidified and shaped, so that the temperature of the skin layer is raised, and the expansion force of the core foam body of the model sample can possibly generate three foaming phenomena, so that the shape of the shaped model sample is deformed or destroyed, and the model sample is cooled under the vacuum negative pressure condition, so that the phenomenon can be effectively avoided.
Finally, aging is carried out to volatilize water, pentane and the like.
Optionally: in the step S2, before feeding, the pre-foaming machine is preheated by steam to reach the temperature condition required by foaming, wherein the pressure of pipeline steam is controlled to be 0.1-0.3 Mpa in the pre-foaming process, the pressure of an expansion chamber of the pre-foaming machine is controlled to be 0.03-0.06 Mpa, the pre-foaming temperature is 90-100 ℃, and the foaming time is 38-60 seconds.
Through adopting above-mentioned technical scheme, above-mentioned regulation setting makes the foaming effect of pearl better, on the one hand can not consume too much foaming agent, on the other hand can make the surface luster of pearl, mellow and smooth, have good resilience.
Optionally: the water content of the pattern beads added into the pre-foaming machine is required to be detected to be less than or equal to 1 percent; and when the data value of volatile matters of the pattern beads is detected to be less than 9.5%, the foaming time is controlled to be 55-65 seconds, and when the data value of volatile matters is detected to be more than or equal to 9.5%, the foaming time is controlled to be 36-45 seconds.
By adopting the technical scheme, the specific gravity after pre-expansion can be well controlled, the product waste and quality deviation caused by instability are reduced, and meanwhile, the surface gloss, roundness and good resilience of the beads are further ensured.
Optionally: in the step S2, the working frequency of a stirring shaft of the pre-foaming machine during feeding is smaller than that of a stirring shaft of the pre-foaming machine during foaming, and the working frequency of the stirring shaft of the pre-foaming machine during foaming is smaller than that of the stirring shaft of the pre-foaming machine during discharging.
By adopting the technical scheme, raw materials are paved by stirring during feeding, and the rapid stirring frequency is not needed at the moment; after steam is fed, the beads need to be heated more uniformly, so that the stirring frequency needs to be increased; finally, during discharging, the stirring frequency is quickened to achieve the effect of quick discharging, because the steam stops at the moment, but the foaming barrel has higher temperature, so that the discharging is needed as soon as possible, otherwise, the beads can be continuously foamed, and the foaming is uneven.
Optionally: in the step S3, the volatile matters of the pattern beads are controlled to be 7-8%.
By adopting the technical scheme, the volatile matters are controlled so as to reduce the possibility of three foaming after the bead is formed.
Optionally: and S4, in the preheating process of the die, the temperature of the whole die is kept to be uniform.
By adopting the technical scheme, the phenomenon that the temperature of the die rises unevenly due to too fast heating is avoided, so that fusion of beads on the surface of the die sample is inconsistent.
Optionally: in the step S4, the four heating surfaces are sequentially heated once, and the two opposite surfaces are sequentially heated;
or, two heating surfaces are opposite surfaces or adjacent surfaces each time, the same heating surface is not heated by the two adjacent heating surfaces, and the two opposite surfaces are heated at most twice in the same heating mode.
Through adopting above-mentioned technical scheme, can be better heat the core, simultaneously, can improve the homogeneity of heating, avoid local temperature too high to make performances such as density uniformity, sintering nature better.
Optionally: in the step S4, four times of heating are performed, and simultaneously steam is respectively introduced from two small surfaces of the plate for heating, and the heating steam of the two small surfaces is staggered; the vapor pressure of the facets is less than the heating vapor pressure of the four major facets.
By adopting the technical scheme, on one hand, the sintering property of the ends where the two facets are located can be improved, and on the other hand, the heating effect on the core part can be further improved. The staggered steam inlet ends are arranged on one small face, so that the steam inlet ends and the steam outlet ends are arranged on one small face, the steam inlet temperature is high, and the steam outlet temperature is high, so that certain staggered transmission can be formed, and the whole plate can be heated more uniformly in the length direction.
The heating of the facets is always kept, and welding is generated after the first heating, so that smaller steam pressure is needed, and the situation that the facets are thoroughly welded during subsequent heating is avoided, so that steam cannot pass through.
Optionally: in step S4, the steam pressure and/or time of the two heating of the two opposite end surfaces are set in a decreasing manner.
By adopting the technical scheme, the plate is welded by steam penetration, the subsequent penetration pressure can be reduced, if the steam pressure is too high, the surface is thoroughly welded, the steam cannot pass through, and poor internal welding of the plate can be caused.
Optionally: in the steps S4 and S5, the vacuum pumping is kept at the vacuum condition of minus 0.07 to minus 0.08Mpa, and the two steps are kept in the vacuum state for 380 to 430 seconds.
By adopting the technical scheme, the plate is cooled and shaped in vacuum, so that the plate is not expanded any more and reaches a critical value, the vacuum can be stopped at the moment, and the time for reaching the critical value is basically 380-430 seconds.
Optionally: after the vacuum is turned off for 35-50 seconds, the mold is opened again.
By adopting the technical scheme, after vacuum is closed, the plate is stabilized for 35-50 seconds, and then the plate is opened and taken out, so that the plate has stable time after reaching a critical value.
Optionally: the side wall of the die is arranged in an adjustable size, and in the step S4, the size of a die cavity is larger than that of a finished plate; in step S5, the sheet is extruded through the die sidewall to the sheet size.
Through adopting above-mentioned technical scheme, can pack more beads, and carry out the extrusion by a small margin at the shaping, can form better density, and the appearance quality of panel also can be better, can reduce appearance quality defect's appearance.
Optionally: and (2) after foaming is completed in the step (S2), 5-20L of material is pumped for density test, and then the material feeding amount of the next batch is adjusted according to the test result.
By adopting the technical scheme, the feeding amount of the beads in the next batch is regulated according to the foaming result of the beads in the previous batch, and the foaming density of the beads is controlled, so that the foaming effect is controlled, and the quality of the plate is ensured.
Drawings
FIG. 1 is a diagram showing the structure of a product obtained by pre-foaming beads in the first example under observation by a microscope;
FIG. 2 is a diagram showing the structure of a defective product after pre-foaming of beads in example one under observation by a microscope;
FIG. 3 is a structural view showing the first steam heating in the molding step of the first embodiment;
fig. 4 is a structural view of the second steam heating in the molding step of the first embodiment;
fig. 5 is a structural view of the third steam heating in the molding step of the first embodiment;
fig. 6 is a structural view of the fourth steam heating in the molding step of the second embodiment;
fig. 7 is a structural view of the first steam heating in the molding step of the second embodiment;
fig. 8 is a structural view of the second steam heating in the molding step of the second embodiment;
fig. 9 is a structural view of the third steam heating in the molding step of the second embodiment;
fig. 10 is a structural diagram at the fourth steam heating in the molding step of the second embodiment.
Detailed Description
The present application is described in further detail below with reference to the accompanying drawings.
Example 1: a production process of lost foam casting plates comprises the following steps:
s1, selecting a model bead with a corresponding diameter range according to one tenth of the thinnest wall thickness of a casting, wherein the diameter range of the bead can be divided into five specifications of 0.25-0.35mm, 0.40-0.55mm, 0.45-0.60mm and 0.60-0.90mm in the embodiment.
In the selection, it is considered that the bead of which specification is within the range of which one tenth of the thinnest wall thickness is selected, because when the bead diameter is too large, the density is reduced correspondingly, and when the bead is too small, the production cost and difficulty are increased, so that when the surface requirement is high, the diameter of the bead can be reduced appropriately on the basis of the above. If the surface requirement of the casting is high, the casting is selected to be finer by one specification.
The number of specifications may be divided into four or more than five according to the requirement, but conventionally, the five specifications in this embodiment are already suitable for most cases, and too thin the specification increases the production cost, while too thick the specification affects the quality of the finished product.
S2, pre-foaming, wherein an intermittent steam pre-foaming machine is adopted in the embodiment, the pre-foaming machine is preheated for a plurality of times by steam before feeding, usually 5-8 times are needed until the temperature condition required by foaming is reached, and then feeding is started.
Wherein, the volatile and moisture content of the pattern beads need to be detected before the pattern beads are added into a pre-foaming machine, and the moisture detection is required to be less than or equal to 1 percent. When the data value of volatile matters of the pattern beads is detected to be less than 9.5%, the foaming time is controlled to be 55-65 seconds; and when the data value of volatile matters is detected to be more than or equal to 9.5%, the foaming time is controlled to be 36-45 seconds.
The data values of the two foaming times are specifically required to be adjusted according to the pre-foaming equipment, the model beads and the like.
During feeding, the stirring shaft of the pre-foaming machine is usually started at 28-35 HZ, and stirring ensures that the beads are spread.
In the pre-foaming process, the steam pressure of the pipeline is controlled to be 0.1-0.3 Mpa, the pressure of an expansion chamber of a pre-foaming machine is controlled to be 0.03-0.06 Mpa, the pre-foaming temperature is 90-100 ℃, and the foaming time is controlled according to volatile matter data values.
In the steam foaming process, the stirring frequency of the stirring shaft is automatically increased, which is generally 1.2-2 times that of the stirring shaft in the feeding process, and the frequency is converted into 47-55 HZ under normal conditions.
After foaming, the material gate of the pre-foaming machine is opened to make the beads enter the fluidized bed for stabilizing pressure, and the reason is that the inside of the foam holes of the beads are in a negative pressure state, hot air of the fluidized bed is needed for shaping, and then the beads enter a storage bin for curing. Wherein, when discharging, the top of the pre-foaming machine starts to send air for discharging, the stirring frequency of the stirring shaft is automatically increased, which is generally 1.2-1.6 times of that of foaming, and the frequency is automatically changed to 66-75 HZ under normal conditions.
In the discharging process, 5-20L of automatic system material drawing enters a density test, 10L of conventional material drawing is performed, the system records and feeds back to a DWS information acquisition and management system, the DWS information acquisition and management system calculates the material feeding amount of the next pot, and then the next batch production is started according to the calculated material feeding amount.
After the prefoaming is finished, the extracted beads are cut into slices and then observed under a microscope at 40-50 times, the slices are qualified products shown in fig. 1, the slices are broken unqualified products shown in fig. 2, the observation result under the normal condition of the prefoaming is similar to that of fig. 1, and if the observation result is different from that of fig. 1 to a certain extent, specific parameters in the prefoaming step can be adjusted. And if the situation described in fig. 2 occurs, a shutdown is required to detect the cause.
S3, curing, namely ventilating and curing the pre-foamed pattern beads in a storage bin, and controlling the volatile matters of the pattern beads to be 7-8% so as to reduce the possibility of three foaming after the molding of the beads.
The curing time of the beads is generally controlled to be 12 to 48 hours, and is specifically adjusted according to curing equipment, curing environment and volatile matters.
S4, forming, namely preheating the die to 85-100 ℃, wherein the specific preheating temperature is determined by the foaming temperature of the beads in the forming step, so that the preheating temperature and the foaming temperature tend to be consistent, and the temperature is usually 90 ℃, and can be specifically adjusted according to actual conditions.
In addition, during preheating of the mold, it is necessary to keep the temperature rise of the entire mold uniform.
After the mould is preheated, the cured pattern beads are added into the mould for filling, and in the filling process, uniform and compact filling needs to be ensured, otherwise, qualified and high-quality products cannot be obtained.
After filling, vacuumizing to-0.07 to-0.08 Mpa, and taking an intermediate value of-0.075 Mpa. And introducing steam for heating after vacuumizing, wherein four times of steam heating are performed in total, and the four times of steam heating are performed from four different heating surfaces, wherein the heating surfaces are four large surfaces of the plate respectively.
The heated steam temperature is not allowed to be set too high, normally 85-100 ℃ is adopted, and is kept above and below 90 ℃ initially, if the temperature is too high, internal sintering is poor, and if the temperature is required to be adjusted later, the temperature can be increased or decreased appropriately.
As shown in fig. 3 to 6, the four heating surfaces are heated one time in sequence, and the two opposite surfaces are heated one by one.
And, when heating four big faces, respectively leading steam from the facet of two panel heats, and a facet is simultaneously at same time at steam inlet district and play vapour district, makes the heating steam to two facets be crisscross setting, and it is noted here that the steam pressure of facet is less than the heating steam pressure of four big faces.
The pressure of the heating steam is controlled to be 0.07-0.1 Mpa, and the time for heating the steam each time is controlled to be 6-13 seconds. The steam pressure of the facets is usually set to 0.07-0.8 Mpa, and the initial steam pressure is 0.07Mpa, and the subsequent steam pressure is properly increased according to the quality of the product.
In the heating process of two adjacent times, namely when the two opposite end surfaces are heated respectively, the steam pressure and/or the time of the two heating times are in a decreasing setting. It should be noted here that, according to circumstances, the steam pressure may be set to remain the same or be increased when the time is set to decrease gradually; or the time may be set to remain the same or to increment while the steam pressure is decremented.
S5, shaping, namely starting vacuum when an expansion point generated by the penetrating pressure of steam reaches a set value in the shaping process, and cooling and shaping through vacuum negative pressure until the inside of the die is stabilized.
In the whole S4 forming and S5 forming process, the vacuum is carried out for 380-430 seconds, and the specific time is based on the time when the plate reaches the critical value and is not expanded any more.
And closing vacuum after the pressure stabilization is achieved in the die, and opening the die to eject the plate after 35-50 seconds. The purpose of die opening after 35-50 seconds is to make the plate have stable time, and the specific time is different according to different bead diameters, different foaming conditions and different density requirements, and the plate is usually set to about 40S.
S6, aging, namely placing the formed plate into a curing area for standing for volatilizing treatment, and placing the plate into a drying room at 50 ℃ after standing for 1-3 days in the curing area under normal conditions until the detection value of volatile matters is less than or equal to 2%.
Wherein, during the aging process, the alkane volatilizes faster in spite of the high temperature. But cannot be directly dried, and the foam has insulativity, so that the water in the foam cannot be dried out, and the foam needs to be firstly stood.
The rest time is required to be prolonged if it is not performed in a drying room.
In the production process, the bead material, the plate size, the die structure, the foaming density and the like have influence on various parameters in the process, so that the process needs to be properly adjusted according to different conditions.
Table 1 below shows some of the possible drawbacks of the finished sheet material during the production process, namely the solutions concerned.
TABLE 1
Example 2: the difference from example 1 is that: the side walls of the mold in this embodiment are sized adjustably, typically the side walls on the side of the mold opening.
And, in step S4, the mold cavity size is set to be larger than the size of the finished sheet, so that more beads can be filled.
In the step S5, the plate is extruded through the side wall of the die, and the amplitude of extrusion is generally 1/500-1/200 of the size of the plate in the direction.
In this embodiment, the pressure and/or time of heating all the steam in the step S4 may be reduced by 0.02-0.06 Mpa.
Example 3: the difference from example 1 is that: the two heating surfaces are opposite surfaces or adjacent surfaces each time, the same heating surface is not heated by the two adjacent heating surfaces, and the two opposite surfaces are heated at most twice in the same heating mode.
As shown in fig. 7 to 10, in this embodiment, a mode of heating two opposite surfaces simultaneously is adopted first, and after two times of heating, one time of heating is completed on four heating surfaces; the heating effect in the middle region is not good at this time.
Therefore, the two adjacent surfaces are heated at the same time, and the four heating surfaces are heated once again, so that the middle area can be heated well.
The embodiments of the present invention are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in this way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (10)
1. The production process of the lost foam casting plate is characterized by comprising the following steps of:
s1, selecting a sample, and selecting a model bead with a corresponding diameter range according to casting requirements;
s2, pre-foaming, namely heating the pattern beads by using steam, and stirring the pattern beads to expand the pattern beads to finish foaming;
s3, curing, namely ventilating and curing the pre-foamed pattern beads;
s4, forming, namely preheating a die, and then adding cured pattern beads into the die for filling; introducing steam for heating after vacuumizing, wherein four times of steam heating are performed in total, and the four times of steam heating are performed from four different heating surfaces which are four large surfaces of the plate respectively;
the four heating surfaces are sequentially heated once, the two opposite surfaces are sequentially heated, and the steam pressure and/or the steam time for the two heating of the two opposite end surfaces are in decreasing arrangement;
or, heating two heating surfaces each time, wherein the two heating surfaces are opposite surfaces or adjacent surfaces, the same heating surface is not heated by the two adjacent heating surfaces, and the two opposite surfaces are heated at most twice in the same heating mode;
and the four times of steam heating are simultaneously carried out, steam is respectively introduced from two small surfaces of the plate for heating, and the heating steam of the two small surfaces is arranged in a staggered way; the steam pressure of the small surface is smaller than the heating steam pressure of the four large surfaces;
s5, shaping, namely starting vacuum when an expansion point generated by the penetrating pressure of steam reaches a set value in the shaping process, and cooling and shaping through vacuum negative pressure; until the pressure inside the die reaches the pressure stabilizing, then closing the vacuum, and opening the die to eject the plate;
s6, aging, and standing the formed plate for volatilization treatment.
2. The production process of the lost foam casting plate according to claim 1, wherein the production process is characterized in that: in the step S2, before feeding, the pre-foaming machine is preheated by steam to reach the temperature condition required by foaming, wherein the pressure of pipeline steam is controlled to be 0.1-0.3 mpa in the pre-foaming process, the pressure of an expansion chamber of the pre-foaming machine is controlled to be 0.03-0.06 mpa, the pre-foaming temperature is 90-100 ℃, and the foaming time is 38-60 seconds.
3. The production process of the lost foam casting plate according to claim 1, wherein the production process is characterized in that: the water content of the pattern beads added into the pre-foaming machine is required to be detected to be less than or equal to 1 percent; and when the data value of the volatile matters of the pattern beads is detected to be less than 9.5%, the foaming time is controlled to be 55-65 seconds, and when the data value of the volatile matters is detected to be more than or equal to 9.5%, the foaming time is controlled to be 36-45 seconds.
4. The production process of the lost foam casting plate according to claim 1, wherein the production process is characterized in that: in the step S2, the working frequency of a stirring shaft of the pre-foaming machine during feeding is smaller than that of a stirring shaft of the pre-foaming machine during foaming, and the working frequency of the stirring shaft of the pre-foaming machine during foaming is smaller than that of the stirring shaft of the pre-foaming machine during discharging.
5. The production process of the lost foam casting plate according to claim 1, wherein the production process is characterized in that: and S3, controlling the volatile matters of the pattern beads to be 7-8%.
6. The production process of the lost foam casting plate according to claim 1, wherein the production process is characterized in that: and S4, in the preheating process of the die, the temperature of the whole die is kept to be uniform.
7. The production process of the lost foam casting plate according to claim 1, wherein the production process is characterized in that: in the steps S4 and S5, the vacuum pumping is kept at the vacuum condition of minus 0.07 to minus 0.08Mpa, and the two steps are kept in the vacuum state for 380 to 430 seconds.
8. The production process of the lost foam casting sheet according to claim 1 or 7, wherein the production process is characterized in that: and opening the die after the vacuum is turned off for 35-50 seconds.
9. The production process of the lost foam casting plate according to claim 1, wherein the production process is characterized in that: the side wall of the die is arranged in an adjustable size, and in the step S4, the size of a die cavity is larger than that of a finished plate; in step S5, the sheet is extruded through the die sidewall to the sheet size.
10. The production process of the lost foam casting plate according to claim 1, wherein the production process is characterized in that: and (2) after foaming is completed in the step (S2), performing density test by pumping 5-20L of materials, and adjusting the feeding amount of the next batch according to the test result.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02292026A (en) * | 1989-05-01 | 1990-12-03 | Nabeya Iron & Tool Works Ltd | Molding method of foam casting model |
| US5078932A (en) * | 1983-12-30 | 1992-01-07 | Grunzweig & Hartmann Und Glasfaser Ag | Method and apparatus for making a disposable casting pattern of expanded foamed beads |
| CN107552725A (en) * | 2017-09-21 | 2018-01-09 | 安徽工程大学 | A kind of STMMA large scales cavityless casting sheet material evaporative pattern and preparation method thereof |
| CN107650395A (en) * | 2017-09-21 | 2018-02-02 | 安徽工程大学 | A kind of FD disappearances template material preparation method and its obtained disappearance template material |
| CN112936706A (en) * | 2021-01-27 | 2021-06-11 | 芜湖冠锋模具塑料有限公司 | Lost foam plate production process using STMMA material |
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2021
- 2021-11-18 CN CN202111372952.2A patent/CN114082884B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5078932A (en) * | 1983-12-30 | 1992-01-07 | Grunzweig & Hartmann Und Glasfaser Ag | Method and apparatus for making a disposable casting pattern of expanded foamed beads |
| JPH02292026A (en) * | 1989-05-01 | 1990-12-03 | Nabeya Iron & Tool Works Ltd | Molding method of foam casting model |
| CN107552725A (en) * | 2017-09-21 | 2018-01-09 | 安徽工程大学 | A kind of STMMA large scales cavityless casting sheet material evaporative pattern and preparation method thereof |
| CN107650395A (en) * | 2017-09-21 | 2018-02-02 | 安徽工程大学 | A kind of FD disappearances template material preparation method and its obtained disappearance template material |
| CN112936706A (en) * | 2021-01-27 | 2021-06-11 | 芜湖冠锋模具塑料有限公司 | Lost foam plate production process using STMMA material |
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