CN112295871A - Technology for pressurizing and permeating reinforcer on surface of mould and container - Google Patents
Technology for pressurizing and permeating reinforcer on surface of mould and container Download PDFInfo
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- CN112295871A CN112295871A CN201910699197.5A CN201910699197A CN112295871A CN 112295871 A CN112295871 A CN 112295871A CN 201910699197 A CN201910699197 A CN 201910699197A CN 112295871 A CN112295871 A CN 112295871A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/11—Vats or other containers for liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
- B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
- B05C3/09—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating separate articles
Abstract
A technology for pressurizing and permeating a reinforcer on the surface of a mold comprises the steps of immersing the mold in a container filled with the reinforcer, sealing the container to enable the container to be in a positive pressure state and to be kept for a set time so that the reinforcer permeates into the mold, opening the container, and taking out to obtain the mold coated with the reinforcer; the mold is formed by pressing or printing granular materials, the reinforcer is filled in a container in a liquid state and permeates into the mold in a liquid state, the reinforcer has a hardening process of changing the liquid state into a solid state, and the surface hardness of the mold coated with the reinforcer is not lower than 78HD after being hardened. The problems of difficult and slow permeation and uneven permeation of the mold are well solved, the permeation rate is dozens of times of natural permeation, the required permeation depth can be obtained by adjusting the pressure, and the technical problem that some high-viscosity glue cannot be permeated and enhanced is also solved.
Description
Technical Field
The invention relates to a mold surface treatment process formed by pressing or printing a granular material, in particular to a mold surface pressurization permeation enhancer process and a container.
Background
At present, the surface hardening agent is coated in two ways, one is brush-coated by a brush, the other is soaked in the hardening agent, the former is slow in coating efficiency and needs repeated brush-coating, the later obtained product has uneven thickness of the surface hardening agent layer, and the obtained product has uneven quality level, so a new surface hardening agent coating process is needed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a process and a container for pressurizing and permeating a reinforcer on the surface of a mold.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a technology for pressurizing and permeating a reinforcer on the surface of a mold comprises the steps of immersing the mold in a container filled with the reinforcer, sealing the container to enable the container to be in a positive pressure state and to be kept for a set time so that the reinforcer permeates into the mold, opening the container, and taking out to obtain the mold coated with the reinforcer; the mold is formed by pressing or printing granular materials, the reinforcer is filled in a container in a liquid state and permeates into the mold in a liquid state, the reinforcer has a hardening process of changing the liquid state into a solid state, and the surface hardness of the mold coated with the reinforcer after being hardened is not lower than 85 HD.
The improvement is that the reinforcer permeates into the die in a positive pressure mode, the active permeation mode is superior to the original diffusion permeation mode, the diffusion time is short, the efficiency is high, the permeation of each surface is uniform, the controllability is strong, the operation is convenient, the adaptive pressure and time are selected according to the requirements of different dies, and the surface hardness of the die can be obviously enhanced and the die performance is improved by the mode of coating the reinforcer on the die. The mould in the scheme can be a handicraft or a casting pattern.
Preferably, the tensile strength of the mold coated with the reinforcing agent is not lower than 15MPa after hardening.
The surface hardening agent has the function of improving the surface hardness and tensile strength of the die, so that the originally fragile and fragile die is firmer and is convenient to transport and work.
Preferably, the hardening process of the reinforcing agent from a liquid state to a solid state at normal temperature takes more than 12 hours.
The hardening agent with long hardening time is selected, so that the hardening agent is more suitable for the industrial production, and the hardening agent can be hardened after one week at the longest, so that the operation is convenient, and the industrial production is facilitated.
Preferably, the die is made of 5-2000 mesh particle materials, and preferably, the die is made of 70-800 mesh particle materials.
The mold is formed by pressing or printing granular materials, gaps are formed among granules to enable the reinforcer to permeate, corresponding requirements are also made on the mesh number of the granular materials, and the granularity is in a certain range, so that the mold is suitable for permeating the reinforcer with certain viscosity.
Preferably, the mold is made of at least one granular material selected from silica sand, fused quartz, fused corundum particles, mullite particles, sillimanite particles, kaolinite clinker, refractory clay, zircon sand, rutile particles, spinel particles, magnesium oxide, calcium oxide, ceramsite sand, complex ore sand, silicon carbide powder, silicon nitride powder, aluminum oxide powder and starch; preferably, the mould is made of silica sand particles.
The materials have respective properties, can be made into corresponding moulds, for example, silica sand is widely applied at present, is used as a raw material of a sand core for subsequent casting work and the like, and the rest materials can be made into different moulds in a pressing or printing mode.
Preferably, the reinforcing agent comprises epoxy resin AB glue, epoxy-polyamide AB glue, phenol-epoxy resin AB glue, phenol-formaldehyde resin, urea-formaldehyde resin, polyurea resin, polyurethane glue, melamine-formaldehyde resin, epoxy resin, silicone resin, furan resin, unsaturated polyester, acrylic resin, polyimide, polybenzimidazole, phenol-polyvinyl acetal, phenol-polyamide, epoxy-polyamide, at least one of vinyl polymer, polyvinyl acetate, polyvinyl alcohol, perchloroethylene, polyisobutylene, polyester, polyether, polyamide, polyacrylate, a-cyanoacrylate, polyvinyl acetal, ethylene-vinyl acetate copolymer, phenolic-butyronitrile glue, phenolic-neoprene glue, phenolic-polyurethane glue, epoxy-butyronitrile glue, and epoxy-polysulfide glue; preferably, the reinforcing agent comprises at least one of epoxy resin AB glue, epoxy-polyamide AB glue, phenolic-epoxy resin AB glue, polyurea resin, epoxy resin, polyurethane glue and phenolic resin; preferably, the reinforcing agent is a two-component adhesive, namely at least one of epoxy resin AB adhesive, epoxy-polyamide AB adhesive and phenolic-epoxy resin AB adhesive.
Listed above are suitable as reinforcing agents for industrial applications, which materials, after curing, have a significantly improved hardness and which can be subjected to a combustion treatment by means of a thermal process regeneration plant in order to recover the particulate material, which is easier to recycle industrially and saves costs. The enhancer is one component or two components, and the two components need to be mixed in proportion before use.
Preferably, the reinforcer penetrates into the surface of the mold by at least 2 mm, and preferably, the reinforcer penetrates into the surface of the main body by 2-8 mm.
According to experiments, the surface hardness and tensile strength of the mold can be enhanced by times when the reinforcer permeates into the mold by 2 mm under the condition of a common small mold, so that the use requirement is met, the large mold needs to permeate deeper, generally not more than 5 mm, and only the mold with special requirement needs the reinforcer to permeate into the mold by the depth of more than 5 mm. The penetration depth is proper, the recovery load is increased when the penetration depth is too thick, and the use requirement cannot be met due to the property of a too thin surface.
Preferably, the depth of the fortifier in the container is no more than 6 meters.
The depth of the reinforcer is not too deep easily, it is enough that the reinforcer generally submerges several centimeters from the upper surface of the die, if too deep, the lower part of the side surface of the die bears certain pressure from the reinforcer when not bearing positive pressure, so that the uniformity of the infiltration depth of the reinforcer is influenced, the depth of the reinforcer in the container is not more than 6 meters, and the horizontal area of the container or the number of the containers in the vertical direction can be increased for increasing the treatment capacity.
Preferably, the step of taking out and obtaining the mold coated with the reinforcing agent is specifically as follows: taking out and turning the mold coated with the reinforcer at 180 degrees, standing for a set time, turning the mold coated with the reinforcer at 180 degrees, treating glue drops on the surface of the mold coated with the reinforcer, and curing the reinforcer on the outer layer of the mold coated with the reinforcer.
The mold which is taken out and coated with the reinforcer has a glue dripping phenomenon, the glue dripping phenomenon can be relieved through the overturning, the permeation of the reinforcer is facilitated, the next hardening treatment can be carried out only by simply treating the glue dripping, the hardening can be still standing, the process can be accelerated through a heating or microwave mode, and a proper mode is selected according to the requirement.
Preferably, the positive pressure state of the container is that the pressure in the container is 0.1-1.8 MPa.
The mould is formed by pressing or printing the granular material, so the bearing pressure is also in a certain range, and experiments show that the pressure range can ensure the smooth permeation of the reinforcing agent and cannot influence the mould, so the mould is the optimal pressure.
Preferably, the pressure in the container is increased from the normal pressure state to the positive pressure state at a pressurization rate of 0.3 to 0.8MPa/min, and the pressure in the container is decreased from the positive pressure state to the normal pressure state at a depressurization rate of 0.3 to 0.8 MPa/min.
The experiment process finds that the speed of pressurization and depressurization can also influence the mould, and if the speed is too high, the mould is easy to damage, so the pressurization and depressurization speed needs to be controlled, the damage caused by pressurization is reduced, and the rejection rate is reduced.
Preferably, the container is kept in a positive pressure state for 2 to 6 minutes.
Holding time to control penetration depth, since penetration generally need not be too deep, less than 6 minutes is sufficient in most cases unless special circumstances such as too small a particle size, too high an annual reinforcement, etc. are encountered, and the time to hold positive pressure can be increased where the mold can withstand.
A container for a mold surface pressurization permeation enhancer process comprises a box body, an upper cover, a lifting device, a partition plate and an inflation inlet, wherein the upper opening of the box body is sealed by the upper cover, the inflation inlet is formed in the box body, the partition plate is arranged in the box body and driven by the lifting device to move along the vertical direction of the box body, and the aperture of the partition plate is matched with that of the box body; the partition is a grid plate of at least 40 mesh.
The container is kept sealed and then filled with a gas, preferably an inert gas, to a positive pressure, which protects the enhancer in the container from participating in or interfering with the permeation process. Wherein the mould is put into to the baffle after rising, and the baffle descends with the speed of setting for the mould soaks in the reinforcer, then seals the pressurization, and after the infiltration, reuse baffle rises the mould and takes out, and the baffle is the net board, makes things convenient for the infiltration of the bottom surface reinforcer of mould and baffle contact.
The utility model provides a container is used in mould surface pressurization infiltration enhancer technology, includes cylinder body, movable plug, hoisting device, grid plate, the cylinder body has an opening, the movable plug is sealed the opening, and moves along the opening, be provided with the grid plate in the cylinder body, the hoisting device drive the grid plate is followed the cylinder body moves, the grid plate is 40 mesh grid plates at least.
The container is sealed between the movable plug and the cylinder body, then the movable plug is moved to compress air in the container, and the positive pressure state can be kept in the container by the mode, so that the cost is low, the operation is convenient, and the safety is high.
According to the technical scheme, the reinforcing agent permeates into the die in a pressurizing mode, so that the uniformity of permeation of each surface is good, the situation that the permeation depth of the upper surface is obviously higher than that of other surfaces, the permeation depth of the bottom surface is not enough under the condition that the permeation depth of the other surfaces is enough and strong is avoided, the reinforcing agent can permeate into the die in a pressurizing mode by soaking or brushing the die which is difficult to permeate into the die, and the application range is wider and the effect is good.
Drawings
FIG. 1 is a front view of a mold surface pressure infiltration enhancer process vessel according to one embodiment of the disclosure.
FIG. 2 is a cross-sectional view of a mold surface pressure infiltration enhancer process vessel according to one embodiment of the disclosure.
FIG. 3 is a top view of a mold surface pressure infiltration enhancer process vessel according to one embodiment of the disclosure.
In the figure: the box body 10, the upper cover 20, the lifting device 30, the clapboard 40 and the inflation inlet 50.
Detailed Description
A technical solution of the embodiments of the present invention is further described in detail with reference to the accompanying drawings of the present invention.
Example 1:
a technology for pressurizing and permeating reinforcer on the surface of mould features that the mould is immersed in a container with reinforcer whose depth is not more than 6 m. And then sealing the container to enable the container to be in a positive pressure state of 0.1-1.8 MPa and keeping the positive pressure state for 2-6 minutes so as to enable the reinforcing agent to permeate into the mold, wherein in the process, the pressure in the container is increased from a normal pressure state to the positive pressure state at a pressurization rate of 0.3-0.8 MPa/min, and the pressure in the container is reduced from the positive pressure state to the normal pressure at a depressurization rate of 0.3-0.8 MPa/min. And opening the container, taking out and obtaining the mold coated with the reinforcer, specifically taking out and turning the mold coated with the reinforcer 180 degrees, standing for a set time, turning the mold coated with the reinforcer 180 degrees, treating the glue drops on the surface of the mold coated with the reinforcer, and hardening the reinforcer on the outer layer of the mold coated with the reinforcer. The surface hardness of the hardened die coated with the reinforcer is not lower than 85HD, and the tensile strength of the hardened die is not lower than 15 MPa.
The mold is made of granular materials through pressing or printing, and is specifically made of at least one granular material of silica sand, fused quartz, fused corundum particles, mullite particles, sillimanite particles, kaolinite clinker, refractory clay, zircon sand, rutile particles, spinel particles, magnesium oxide, calcium oxide, ceramsite sand, complex ore sand, silicon carbide powder, silicon nitride powder, alumina powder and starch, wherein the granular materials are 5-2000 meshes of granular materials, and preferably 70-800 meshes of granular materials. The above materials are all materials used for industrial additive manufacturing, and are also suitable for making moulds, and the scheme of the invention preferably uses the above materials, and certainly does not exclude the expansion of new particle materials for moulds.
The reinforcer is filled in a container in a liquid state and permeates into the mould in a liquid state, the reinforcer has a hardening process of changing the liquid state into a solid state, and comprises epoxy resin AB glue, epoxy-polyamide AB glue, phenolic-epoxy resin AB glue, phenolic resin, urea resin, polyurea resin, polyurethane glue, melamine-formaldehyde resin, epoxy resin, organic silicon resin, furan resin, unsaturated polyester, acrylic resin, polyimide, polybenzimidazole, phenolic-polyvinyl acetal, phenolic-polyamide, epoxy-polyamide, vinyl polymer, polyvinyl acetate, polyvinyl alcohol, perchloroethylene, polyisobutylene, polyester, polyether, polyamide, polyacrylate, a-cyanoacrylate, polyvinyl acetal, ethylene-vinyl acetate copolymer, phenolic-butyronitrile glue, epoxy-formaldehyde resin AB glue, epoxy resin, furan-formaldehyde resin, unsaturated polyester, epoxy resin, epoxy, At least one of phenolic aldehyde-neoprene adhesive, phenolic aldehyde-polyurethane adhesive, epoxy-butyronitrile adhesive and epoxy-polysulfide adhesive, preferably, the reinforcer comprises at least one of epoxy resin AB adhesive, epoxy-polyamide AB adhesive, phenolic aldehyde-epoxy resin AB adhesive, polyurea resin, epoxy resin, polyurethane adhesive and phenolic resin; preferably, the reinforcing agent is a two-component adhesive, namely at least one of epoxy resin AB adhesive, epoxy-polyamide AB adhesive and phenolic-epoxy resin AB adhesive. The hardening process of the reinforcing agent from liquid state to solid state at normal temperature takes more than 12 hours.
Example 2:
referring to fig. 1-3, a container for a mold surface pressurization permeation enhancer process includes a box body 10, an upper cover 20, a lifting device 30, a partition plate 40, and an inflation inlet 50, wherein an upper opening of the box body 10 is sealed by the upper cover 20, the box body 10 is provided with the inflation inlet 50, the partition plate 40 is arranged in the box body 10 and is driven by the lifting device 30 to move along the vertical direction of the box body 10, and the aperture of the partition plate 40 is matched with that of the box body 10; the partition 40 is a mesh plate of at least 40 mesh. A check valve is arranged at the air charging port 50.
As shown in the drawing, the lifting device 30 lifts or lowers the partition 40 in a chain manner, and the structure is relatively simple, and a hydraulic lifting device or the like may be provided in the box 10 to allow the partition 40 to perform a lifting function. After sealing, the container is maintained at a positive pressure by introducing a gas, preferably an inert gas.
Example 3:
the utility model provides a container is used in mould surface pressurization infiltration enhancer technology, includes cylinder body, movable plug, hoisting device, grid plate, the cylinder body has an opening, the movable plug is sealed the opening, and moves along the opening, be provided with the grid plate in the cylinder body, the hoisting device drive the grid plate is followed the cylinder body moves, the grid plate is 40 mesh grid plates at least.
Different from embodiment 2, this embodiment is through the space that the interior air of compression cylinder occupied, keeps the malleation state in the cylinder body, and the air in the compression cylinder body is to the motion in the cylinder body for be the malleation state in the cylinder body, come control pressure size through control motion stopper stroke, control the speed of movement through control motion stopper and control the speed of stepping up or stepping down.
Example 4:
a: primary treatment of a mold:
it is possible to use the mold described in example 1 above. Sand molds pressed or printed from 140 mesh silica sand, which is most commonly used in the industry, are selected. Firstly, blowing off surface powder, and cleaning the surface of the die by processing modes such as compressed air or sand paper grinding or mechanical grinding to obtain the surface-treated die.
B, preparation of a reinforcing agent:
the reinforcer is selected from a single-component adhesive with low viscosity and long service life (the service life is more than or equal to 24 hours), and the viscosity of the reinforcer is controlled to be 2000 cps. Pouring into a container and mixing uniformly. Then according to the performance requirement of the product, a certain proportion of toughening agent can be optionally added or not added, and the stirrer is started to stir uniformly for later use. Finally, the product is processed
C: infiltration of the fortifier:
according to the size of the product. Performance requirements, selection of container size, selection of enhancer size, selection of pressurization rate, pressure value and hold time. The surface-treated mold is placed in a raised partition 40 in a container by a truss or a crane, wherein the container can refer to examples 2 and 3, the partition 40 moves downward at a speed of 2m/min so that the mold is immersed in a reinforcing agent and is completely submerged in the reinforcing agent, the penetration depth of the mold in this example is 2-3 mm, and the surface hardness and tensile strength after curing are satisfactory, so that the parameters of the pressure penetration process are as follows, pressurization is performed by flushing nitrogen gas into the container at a pressurization rate of 0.2MPa/min, and when the pressure of 0.2MPa is finally reached, pressurization is stopped, 0.2MPa 1min is maintained, then the pressure is reduced at a pressure reduction rate of 0.2MPa/min, the upper cover 20 is opened after gas is exhausted, and a motor is started to lift the mold placed on a 30-mesh filter screen out of the liquid level at a speed of 2 m/min.
D: and (3) glue dripping treatment:
taking out the mold coated with the reinforcer and turning the mold 180 degrees, standing the mold coated with the reinforcer on the upper part of the glue dripping pool for 15 minutes, then standing the mold for 10 minutes, and brushing off redundant glue drops by using a brush.
E: hardening treatment:
hardening the reinforcer on the surface of the die by adopting a microwave heating mode in order to improve the efficiency, and baking for 10min in a microwave oven with 10KW of power to obtain the cured die. Surface treatment such as polishing or coloring can be performed at a later stage to meet customer requirements.
The mold surface pressurization penetration enhancer process is tested, the same material and the same method are used for obtaining a standard mold block, one group is blank control, namely the sand core is not coated with the enhancer, namely before the sand core is treated, the other group is coated with the enhancer in a conventional non-pressurization penetration mode, the other group is coated with the enhancer in a pressurization penetration mode, the pressurization penetration and the non-pressurization penetration treatment time length is consistent, namely the non-pressurization penetration treatment time is 4 minutes, the pressurization penetration pressurization time is 1 minute, the pressure maintaining time is 2 minutes, and the pressure reduction time is 1 minute, and three groups of experimental data are compared. The method comprises the following specific steps:
TABLE 1 comparison of tensile Strength and surface hardness before and after mold treatment
As can be seen from table 1, the tensile strength of the mold was significantly improved after the application of the reinforcing agent, and the pressure treatment and the non-pressure treatment were also significantly different, and the penetration by the pressure treatment was relatively deep in the same time period, so that the tensile strength was significantly improved. It can also be seen that the surface hardness is also improved, and the surface hardness obtained by the pressure treatment is higher than that obtained by the non-pressure treatment for the same treatment time.
TABLE 2 comparison of penetration depth at different areas of the mold with/without pressurization
As can be seen from table 2, the upper part, the left and right peripheries, and the upper part are not subjected to pressure infiltration treatment, and the infiltration depth of the upper part is far greater than that of the lower part, i.e. the infiltration manner is greatly influenced by gravity, so that the difference between the upper part and the lower part is large, which is not beneficial to improving the performance of the whole mold. And the difference among the upper part, the left, right periphery and the lower part is small by permeation in a pressurizing mode, namely the influence of gravity is small, the integral permeation is uniform, and the integral performance of the die is improved.
Example 5:
and selecting 140-mesh ceramsite sand, and printing the ceramsite sand by an additive manufacturing method. Firstly, blowing off surface powder, and cleaning the surface of the die to obtain the surface-treated die.
B, preparation of a reinforcing agent:
the reinforcer is AB glue with viscosity of 1500cps and long service life (service life is more than or equal to 12h), the glue A and the glue B are respectively weighed by an electronic scale in proportion, and then mixed in a certain container and stirred uniformly. Then, according to the performance requirement of the product, a certain proportion of toughening agent can be optionally added or not added, and the stirrer is started to stir uniformly for later use.
C: infiltration of the fortifier:
according to the size of the product. Performance requirements, selection of container size, selection of enhancer size, selection of pressurization rate, pressure value and hold time. The surface-treated mold is placed in a raised partition 40 in a container, which can be referred to in examples 2 and 3, by a truss or a crane, and the partition 40 is moved downward at a speed of 2m/min so that the mold is immersed in the reinforcing agent and so that the mold is completely submerged in the reinforcing agent.
C: infiltration of the fortifier:
according to the size of the product. Performance requirements, selection of container size, selection of enhancer size, selection of pressurization rate, pressure value and hold time. The surface-treated mold is placed in the raised partition 40 in a container, which can be referred to in examples 2 and 3, by a truss or a crane, and the partition 40 is moved downward at a speed of 2m/min, so that the mold is immersed in the reinforcing agent, and the mold is completely submerged in the reinforcer, the penetration depth of the mold is 5-8 mm, the surface hardness and the tensile strength after curing meet the requirements, therefore, the parameters of the pressurizing and permeating process are as follows, the pressurizing is carried out by a mode of injecting nitrogen into a container, the pressurizing rate is 0.6MPa/min, the time is 3 minutes, the pressurizing is stopped when the pressure reaches 1.8MPa, the pressure is kept for 1.8MPa 4min, then, the pressure is reduced for 3 minutes at the pressure relief rate of 0.2MPa/min, the upper cover 20 is opened after the air is exhausted, and the motor is started to lift the die placed on the 30-mesh filter screen out of the liquid level at the speed of 2 m/min.
D: and (3) glue dripping treatment:
taking out the mold coated with the reinforcer and turning the mold 180 degrees, standing the mold coated with the reinforcer on the upper part of the glue dripping pool for 15 minutes, then standing the mold for 10 minutes, and brushing off redundant glue drops by using a brush.
E: hardening treatment:
hardening the reinforcer on the surface of the die by adopting a microwave heating mode in order to improve the efficiency, and baking for 25min in a microwave oven with the power of 25KW to obtain the cured die. Surface treatment such as polishing or coloring can be performed at a later stage to meet customer requirements.
The mold surface pressurization permeation enhancer process is tested, the same material and the same method are used for obtaining a standard mold block, one group is blank control, namely the mold block is not coated with the enhancer, namely before the mold block is processed, the other group is coated with the enhancer on the outer side of the mold block in a conventional non-pressurization permeation mode, the other group is coated with the scheme, namely the enhancer is coated on the outer side of the mold block in a pressurization permeation mode, the pressurization permeation time and the non-pressurization permeation time are consistent, namely the non-pressurization permeation treatment is carried out for 10 minutes, the pressurization permeation time is 3 minutes, the pressure maintaining time is 4 minutes, the pressure reducing time is 3 minutes, and three groups of experimental data are compared. The method comprises the following specific steps:
TABLE 3 comparison of tensile Strength before and after mold treatment
As can be seen from table 3, the tensile strength of the mold was significantly improved after the application of the reinforcing agent, and the pressure treatment and the non-pressure treatment were also significantly different, and the penetration by the pressure treatment was deeper at the same time, so that the tensile strength was significantly improved. It can also be seen that the surface hardness is also improved, and the surface hardness obtained by the pressure treatment is higher than that obtained by the non-pressure treatment for the same treatment time.
TABLE 4 comparison of penetration depth at different areas of the mold with/without pressurization
As can be seen from table 4, the depth of the upper part penetration is far greater than that of the lower part penetration in comparison between the upper part, the left and right peripheries, and the upper part without pressure penetration treatment, that is, the penetration mode is greatly influenced by gravity, which results in a large difference between the upper part and the lower part, and is not beneficial to improving the performance of the whole mold. And the difference among the upper part, the left, right periphery and the lower part is small by permeation in a pressurizing mode, namely the influence of gravity is small, the integral permeation is uniform, and the integral performance of the die is improved.
Many experiments were also conducted, and the specific process flow was similar to that of example 4 and example 5, except that the pressurization process was different, and then comparative experiments were conducted, as shown in the following table.
TABLE 5 statistics of different Process parameters
The results of the different experiments are listed in table 5, each set of moulds is divided into two parts, one part is coated with the reinforcing agent by means of over-pressure penetration and the other part is coated with the reinforcing agent by means of non-pressure penetration, both parts are used consistently, for example, process 1, a reinforcing agent with a viscosity of 1500cps is used, the pressure is increased to 0.1MPa in 1 minute, the pressurization rate is 0.1MPa/min, when the pressure reaches 0.1MPa, the pressurization is stopped, the pressure is maintained for 0.1MPa 2min, then the pressure is reduced to 0MPa in 1 minute, the pressure relief (reduction) rate is 0.1MPa/min, the average depth of the obtained reinforcing agent penetrating into the moulds is 2 mm, the penetration is 4 minutes by means of non-pressure penetration, and the average penetration depth is 1 mm. From the above table, it can be seen that when the viscosity of the enhancer reaches 4000cps, the product can not be subjected to permeation treatment basically when not pressurized, the pressurization process greatly improves the dip-coating effect, solves the difficult problem of difficult material permeation, and improves the production efficiency.
In conclusion, the sand mold can quickly and uniformly permeate through the sealing device in a pressurizing mode, the permeation depth of each surface is basically consistent, the problems of difficult, slow and uneven permeation of the mold are well solved, the permeation rate is dozens of times of natural permeation, the required permeation depth can be obtained by adjusting the pressure, and the technical problem that some high-viscosity glue cannot be permeated and enhanced is also solved.
The pressurizing fast infiltration and post-curing process can be greatly applied to the fields of casting molds, building molds, bridge molds and related fields with pores needing infiltration treatment, can also be used for artware with various complex and precise structures and various cultural and creative products, and greatly improves the production efficiency.
The invention has the advantages of short process flow of pressurization rapid infiltration and post-curing, low production cost, flexibility and controllability, simple equipment requirement and convenient operation, can realize large-scale production, greatly improves the infiltration and curing rate, and simultaneously can ensure the uniformity of the product quality.
Claims (14)
1. A technology for pressurizing and permeating a reinforcer on the surface of a mold is characterized by comprising the following steps: immersing the mold in a container filled with the reinforcer, sealing the container to enable the container to be in a positive pressure state and keep for a set time so that the reinforcer permeates into the mold, opening the container, and taking out to obtain the mold coated with the reinforcer; the mold is formed by pressing or printing granular materials, the reinforcer is filled in a container in a liquid state and permeates into the mold in a liquid state, the reinforcer has a hardening process of changing the liquid state into a solid state, and the surface hardness of the mold coated with the reinforcer is not lower than 78HD after being hardened.
2. The mold surface pressure infiltration enhancer process of claim 1, wherein: the tensile strength of the die coated with the reinforcer is not lower than 8MPa after hardening.
3. The mold surface pressure infiltration enhancer process of claim 1, wherein: the hardening process of the reinforcing agent from liquid state to solid state at normal temperature takes more than 12 hours.
4. The mold surface pressure infiltration enhancer process of claim 1, wherein: the die is made of 5-2000-mesh particle materials, and preferably, the die is made of 70-800-mesh particle materials.
5. The mold surface pressure infiltration enhancer process of claim 1, wherein: the mould is made of at least one granular material of silica sand, fused quartz, fused corundum particles, mullite particles, sillimanite particles, kaolinite clinker, refractory clay, zircon sand, rutile particles, spinel particles, magnesium oxide, calcium oxide, ceramsite sand, complex ore sand, silicon carbide powder, silicon nitride powder and alumina powder; preferably, the mould is made of silica sand particles.
6. The mold surface pressure infiltration enhancer process of claim 1, wherein: the reinforcer comprises epoxy resin AB glue, epoxy-polyamide AB glue, phenolic aldehyde-epoxy resin AB glue, phenolic aldehyde resin, urea resin, polyurea resin, polyurethane glue, melamine-formaldehyde resin, epoxy resin, organic silicon resin, furan resin, unsaturated polyester, acrylic resin, polyimide, polybenzimidazole, phenolic aldehyde-polyvinyl acetal, phenolic aldehyde-polyamide and epoxy-polyamide, at least one of vinyl polymer, polyvinyl acetate, polyvinyl alcohol, perchloroethylene, polyisobutylene, polyester, polyether, polyamide, polyacrylate, a-cyanoacrylate, polyvinyl acetal, ethylene-vinyl acetate copolymer, phenolic-butyronitrile glue, phenolic-neoprene glue, phenolic-polyurethane glue, epoxy-butyronitrile glue, and epoxy-polysulfide glue; preferably, the reinforcing agent comprises at least one of epoxy resin AB glue, epoxy-polyamide AB glue, phenolic-epoxy resin AB glue, polyurea resin, epoxy resin, polyurethane glue and phenolic resin; preferably, the reinforcing agent is a two-component adhesive, namely at least one of epoxy resin AB adhesive, epoxy-polyamide AB adhesive and phenolic-epoxy resin AB adhesive.
7. The mold surface pressure infiltration enhancer process of claim 1, wherein: the reinforcer permeates into the surface of the mold by at least 2 mm, and preferably, the reinforcer permeates into the surface of the main body by 2-8 mm.
8. The mold surface pressure infiltration enhancer process of claim 1, wherein: the depth of the fortifier in the container is no more than 6 meters.
9. The mold surface pressure infiltration enhancer process of claim 1, wherein: the step of taking out and obtaining the mold coated with the reinforcer comprises the following specific steps: taking out and turning the mold coated with the reinforcer at 180 degrees, standing for a set time, turning the mold coated with the reinforcer at 180 degrees, treating glue drops on the surface of the mold coated with the reinforcer, and curing the reinforcer on the outer layer of the mold coated with the reinforcer.
10. The mold surface pressure infiltration enhancer process of claim 1, wherein: the positive pressure state of the container is that the pressure in the container is 0.1-1.8 MPa.
11. The mold surface pressure infiltration enhancer process of claim 1, wherein: and boosting the pressure in the container from the normal pressure state to the positive pressure state at a pressurization rate of 0.3-0.8 MPa/min, and reducing the pressure in the container from the positive pressure state to the normal pressure state at a depressurization rate of 0.3-0.8 MPa/min.
12. The mold surface pressure infiltration enhancer process of claim 1, wherein: keeping the container in a positive pressure state for 2-6 minutes.
13. A container for a mold surface pressurization permeation enhancer process is characterized in that: the box body is provided with the inflation inlet, the partition plate is arranged in the box body and driven by the lifting device to move along the vertical direction of the box body, and the partition plate is matched with the caliber of the box body; the partition is a grid plate of at least 40 mesh.
14. A container for a mold surface pressurization permeation enhancer process is characterized in that: including cylinder body, movable plug, hoisting device, grid board, the cylinder body has an opening, the movable plug is sealed the opening, and moves along the opening, be provided with the grid board in the cylinder body, the hoisting device drive the grid board is followed the cylinder body moves, the grid board is 40 mesh grid plates at least.
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