CN112846143A - High-strength and high-toughness die-casting sand core, preparation method thereof and forming process of die casting - Google Patents
High-strength and high-toughness die-casting sand core, preparation method thereof and forming process of die casting Download PDFInfo
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- CN112846143A CN112846143A CN202011644499.1A CN202011644499A CN112846143A CN 112846143 A CN112846143 A CN 112846143A CN 202011644499 A CN202011644499 A CN 202011644499A CN 112846143 A CN112846143 A CN 112846143A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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Abstract
The application relates to the technical field of die casting, and particularly discloses a high-toughness die-casting sand core, a preparation method thereof and a forming process of a die casting. The high-strength and high-toughness die-casting sand core is used for molding the resin sand core and the protective layer, and the protective layer is uniformly coated on the outer side wall of the molded resin sand core; the protective layer comprises the following components in parts by weight: 3-5 parts of I type synthetic fiber; 1-2 parts of argil; 5-7 parts of aluminum oxide; 26-38 parts of adhesive; 3-5 parts of titanium dioxide; 43-62 parts of water; the preparation method comprises the following steps: 1.1, preparation of the coating: weighing I type synthetic fibers, argil, alumina powder, sodium silicate and titanium dioxide, and stirring for 50-80min to obtain a coating; 1.2, preparation of a molding resin sand core: uniformly mixing quartz sand, liquid casting resin and a curing agent, adding the mixture into a core box, and manually making cores; 1.3, uniformly coating the coating on the outer peripheral wall of the molded resin sand core, and baking at the temperature of 130-150 ℃ for 180-300min to obtain the high-toughness die-casting sand core. The high-strength and high-toughness die-casting sand core has the advantage that the problem that a die casting cannot be placed for sand core forming is solved.
Description
Technical Field
The application relates to the technical field of die casting, in particular to a high-strength and high-toughness die-casting sand core, a preparation method thereof and a forming process of a die casting.
Background
The metal die casting is a process of filling molten metal into a die casting mold cavity at a high speed under a high pressure, and solidifying the molten metal under a high pressure state to form a metal die casting, which is one of the most efficient metal casting methods at present. With the development of metal die-casting molding, the metal die-casting molding technology is combined with plastic injection molding and metal plate punch molding into three major molding systems. The die-casting molding of metal has the remarkable characteristics that: the forming technology can form the non-ferrous metal structural part with a complex shape and a thin wall, and is a precision part forming technology with high efficiency, high precision, high interchangeability and low consumption.
At present, the die casting forming is generally realized by adopting an inclined core pulling or hydraulic core pulling mode through the inverted hook arranged in the die casting cavity, but the inverted hook still often collides with a product structure which is difficult to realize by the method, and can only be realized by adopting a salt core or a sand core.
However, the salt core is expensive in equipment, molds, raw materials and the like and has corrosiveness, so that the salt core can only be used for high-end products and is not suitable for large-batch popularization and application, and the resin sand core is difficult to achieve high-temperature-resistant, high-pressure-resistant and high-speed alloy melting stock scouring, and if a formula with a high resin ratio is adopted to improve the scouring resistance function of the resin sand core, the problem of difficult sand cleaning after die casting molding is caused, so that the salt core is only in an experimental stage and mass production cannot be realized.
Disclosure of Invention
In the forming process of a die casting, in order to avoid the influence on the quality of the die casting caused by the fact that the strength problem of the resin sand core is caused by the fact that the resin sand core is washed in a high-temperature and high-pressure environment to cause sand falling and block falling, the application provides the die casting sand core which is high in strength and toughness and easy to clean, the preparation method of the die casting sand core and the forming process of the die casting.
In a first aspect, the application provides a high-toughness die-casting sand core, which adopts the following technical scheme:
a high-strength and high-toughness die-casting sand core comprises a molding resin sand core and a protective layer, wherein the protective layer is uniformly coated on the outer side wall of the molding resin sand core; the protective layer comprises the following components in parts by weight: 3-5 parts of I type synthetic fiber; 1-2 parts of argil; 5-7 parts of aluminum oxide; 26-38 parts of adhesive; 3-5 parts of titanium dioxide; 43-62 parts of water.
By adopting the technical scheme, the I-type synthetic fiber has the most remarkable characteristic that the monofilament linear density of the I-type synthetic fiber is greatly lower than that of the conventional common fiber, and the strength and toughness of the protective layer are improved by adding the I-type synthetic fiber; the main component of the argil is kaolin, and the argil is added, so that the protective layer can have the effects of heat insulation and lubrication, and the resin sand core is prevented from being heated to cause easy sand falling; the adhesive enables the protective layer to be connected to the molding resin sand core more stably, and the protective layer is prevented from falling off from the molding resin sand core due to the fact that the protective layer is washed by molten metal.
Preferably, the thickness of the protective layer is 0.3 to 1 mm.
By adopting the technical scheme, the thickness of the coating protective layer is controlled, the protective layer can be ensured to play a role in protecting the molding resin sand core, and if the thickness of the protective layer is too low, the protective layer is broken by molten metal, so that the sand falling of the molding resin sand core is caused, and the yield of products is influenced; since the molded resin sand core is a disposable product, if the thickness of the coated protective layer is too thick, the protective layer is wasted, which leads to a problem of cost increase.
Preferably, the adhesive is sodium silicate.
Through adopting above-mentioned technical scheme, because sodium silicate's adhesive force is strong, and its heat resistance is good, bond the protective layer through sodium silicate for the heat resistance of protective layer is better, and can avoid it to drop from the shaping resin psammitolite.
Preferably, the type I synthetic fibers are glass fibers or polypropylene fibers.
By adopting the technical scheme, the heat resistance, the non-combustibility, the high tensile strength and the impact strength of the glass fiber and the polypropylene fiber are excellent, and the addition resistance of the protective layer and the strength of the protective layer can be improved by adding the glass fiber.
Preferably, the type I synthetic fibers are glass fibers.
In a second aspect, the application provides a preparation method of a high-toughness die-casting sand core, which adopts the following technical scheme:
a preparation method of a high-strength and high-toughness die-casting sand core comprises the following preparation steps:
1.1, preparation of the coating: weighing I type synthetic fibers, argil, alumina powder, sodium silicate and titanium dioxide, and stirring for 50-80min to obtain a coating;
1.2, preparation of a molding resin sand core: uniformly mixing quartz sand, liquid casting resin and a curing agent, adding the mixture into a core box, and manually making cores to obtain a molded resin sand core;
1.3, uniformly coating the coating on the outer peripheral wall of the molded resin sand core, baking at the temperature of 130-150 ℃ for 180-300min, and forming a protective layer on the outer peripheral wall of the molded resin sand core by the coating, thus obtaining the high-strength and high-toughness die-casting sand core.
By adopting the technical scheme, the protective layer is coated on the outer wall of the molding resin sand core, so that the surface strength of the molding resin sand core is improved, the molding resin sand core is prevented from falling off when in use, and the yield of products is ensured.
Preferably, the mass ratio of the quartz sand to the liquid casting resin to the curing agent is 100: (3-6): (2-8).
By adopting the technical scheme, the weight ratio of the quartz sand, the liquid casting resin and the curing agent is adjusted to ensure the preparation of the molding resin sand core.
Preferably, the liquid casting resin is one of furan resin, liquid phenolic resin and Pep-Set phenolic resin.
By adopting the technical scheme, the normal temperature strength, the dimensional accuracy and the production efficiency of the sand core can be greatly improved by adding the liquid casting resin, the surface quality of the sand core is good, the storage performance of the sand core is good, and the requirement of mass production can be met.
Preferably, the curing agent is p-toluenesulfonic acid aqueous solution, benzenesulfonic acid aqueous solution, NH4Aqueous Cl solution, aqueous copper sulfonate solution, CuCl2One or more of an aqueous solution and a phosphoric acid solution.
By adopting the technical scheme, the solidification of the sand core can be accelerated by adding the curing agent, the sand core forming time is shortened, and the sand core preparation speed is accelerated.
In a third aspect, the application provides a die casting machining process, which adopts the following technical scheme:
a die casting machining process comprises the following preparation steps:
1.1, loading the high-toughness diecastable sand core of claims 1-4 into a die-casting die of a die-casting machine;
and 1.2, adding molten metal into a die casting machine for die casting, and cooling to obtain a die casting.
By adopting the technical scheme, the high-strength and high-toughness die-casting sand core disclosed by the application file is adopted to produce the die casting, so that the generation of defective products caused by falling of the sand core can be reduced, and the yield of the die casting is improved.
Preferably, the die casting parameters of the die casting machine in the step 1.2 are as follows: the temperature of the die is 200-.
In summary, the present application has the following beneficial effects:
1. the I-type synthetic fiber has the most remarkable characteristic that the monofilament linear density of the I-type synthetic fiber is greatly lower than that of the conventional common fiber, and the strength and toughness of the protective layer are improved by adding the I-type synthetic fiber; the main component of the argil is kaolin, and the argil is added to mainly enable the protective layer to have a heat insulation effect, so that the resin sand core is prevented from being heated to cause easy sand falling; the adhesive enables the protective layer to be connected to the molding resin sand core more stably, and the protective layer is prevented from falling off from the molding resin sand core due to the fact that the protective layer is washed by molten metal.
2. The glass fiber or the polypropylene fiber is preferably adopted as the I-type synthetic fiber, the glass fiber and the polypropylene fiber are excellent in heat resistance, non-combustibility, high tensile strength and impact strength, and the addition of the glass fiber can improve the addition resistance of the protective layer and the strength of the protective layer.
3. The thickness of the coated protective layer is controlled to ensure that the protective layer can play a role in protecting the formed resin sand core, and if the thickness of the protective layer is too low, the protective layer is broken by molten metal to cause sand falling of the formed resin sand core, so that the yield of products is influenced; since the molded resin sand core is a disposable product, if the thickness of the coated protective layer is too thick, the protective layer is wasted, which leads to a problem of cost increase.
Detailed Description
The present application is described in further detail below with reference to preparation examples and examples.
TABLE 1
Preparation example
Preparation example 1
A high-strength and high-toughness die-casting sand core is prepared by the following steps:
s1, preparing a coating;
adding water into a stirring tank, then weighing 3Kg of glass fiber, 1Kg of argil, 5Kg of alumina, 26Kg of sodium silicate and 3Kg of titanium dioxide, adding into the stirring tank, supplementing water to 100L, and then stirring for 50min to obtain the coating;
s2, preparing a molding resin sand core;
s21, weighing 100Kg of quartz sand, 3Kg of furan resin and 2Kg of p-toluenesulfonic acid aqueous solution, sequentially adding the quartz sand, the 3Kg of furan resin and the 2Kg of p-toluenesulfonic acid aqueous solution into a roller type sand mixer for uniform mixing, discharging sand, and placing the sand in a container for later use;
s22, manually making a core, and baking for 40min in an oven at the temperature of 170 ℃ to obtain a molded resin sand core;
s3, preparing a high-strength and high-toughness die-casting sand core;
and (4) uniformly coating the coating in the step S1 on the outer peripheral wall of the formed resin sand core, controlling the thickness of the coating to be 0.3mm, and then baking in an oven at 130 ℃ for 300min to obtain the high-strength high-toughness die-casting sand core.
Preparation example 2
A high-strength and high-toughness die-casting sand core is prepared by the following steps:
s1, preparing a coating;
adding water into a stirring tank, then weighing 4Kg of glass fiber, 1.5Kg of argil, 6Kg of alumina, 32Kg of sodium silicate and 4Kg of titanium dioxide, adding into the stirring tank, supplementing water to 100L, and then stirring for 50min to obtain the coating;
s2, preparing a molding resin sand core;
s21, weighing 100Kg of quartz sand, 4.5Kg of liquid phenolic resin and 5Kg of benzenesulfonic acid aqueous solution, sequentially adding the materials into a roller type sand mixer, uniformly mixing, discharging sand, and placing the sand in a container for later use;
s22, manually making a core, and baking for 40min in an oven at the temperature of 170 ℃ to obtain a molded resin sand core;
s3, preparing a high-strength and high-toughness die-casting sand core;
and (4) uniformly coating the coating in the step S1 on the outer peripheral wall of the formed resin sand core, controlling the thickness of the coating to be 0.3mm, and then baking in an oven at 130 ℃ for 300min to obtain the high-strength high-toughness die-casting sand core.
Preparation example 3
A high-strength and high-toughness die-casting sand core is prepared by the following steps:
s1, preparing a coating;
adding water into a stirring tank, then weighing 5Kg of glass fiber, 2Kg of argil, 7Kg of alumina, 38Kg of sodium silicate and 5Kg of titanium dioxide, adding into the stirring tank, supplementing water to 100L, and then stirring for 50-80min to obtain the coating;
s2, preparing a molding resin sand core;
s21, weighing 100Kg of quartz sand, 6Kg of Pep-Set phenolic resin and 8Kg of NH4Cl aqueous solution, sequentially adding the materials into a roller type sand mixer, uniformly mixing, discharging sand, and placing the sand in a container for later use;
s22, manually making a core, and baking for 40min in an oven at the temperature of 170 ℃ to obtain a molded resin sand core;
s3, preparing a high-strength and high-toughness die-casting sand core;
and (4) uniformly coating the coating in the step S1 on the outer peripheral wall of the formed resin sand core, controlling the thickness of the coating to be 0.3mm, and then baking in an oven at 130 ℃ for 300min to obtain the high-strength high-toughness die-casting sand core.
Preparation example 4
A high-strength and high-toughness die-casting sand core is prepared by the following steps:
s1, preparing a coating;
adding water into a stirring tank, then weighing 3Kg of polypropylene fiber, 1Kg of argil, 5Kg of alumina, 26Kg of sodium silicate and 3Kg of titanium dioxide, adding into the stirring tank, supplementing water to 100L, and then stirring for 75min to obtain the coating;
s2, preparing a molding resin sand core;
s21, weighing 100Kg of quartz sand, 3Kg of furan resin and 2Kg of copper sulfonate aqueous solution, sequentially adding the weighed materials into a roller type sand mixer to be uniformly mixed, discharging sand, and placing the sand in a container for later use;
s22, manually making a core, and baking for 30min in an oven at the temperature of 175 ℃ to obtain a molded resin sand core;
s3, preparing a high-strength and high-toughness die-casting sand core;
and (4) uniformly coating the coating in the step S1 on the outer peripheral wall of the formed resin sand core, controlling the thickness of the coating to be 0.6mm, and then baking in an oven at 140 ℃ for 240min to obtain the high-strength high-toughness die-casting sand core.
Preparation example 5
A high-strength and high-toughness die-casting sand core is prepared by the following steps:
s1, preparing a coating;
adding water into a stirring tank, then weighing 3Kg of glass fiber, 1Kg of argil, 5Kg of alumina, 26Kg of sodium silicate and 3Kg of titanium dioxide, adding into the stirring tank, supplementing water to 100L, and then stirring for 80min to obtain the coating;
s2, preparing a molding resin sand core;
s21, weighing 100Kg of quartz sand, 3Kg of furan resin and 2KgCuCl2 aqueous solution, sequentially adding the materials into a roller type sand mixer, uniformly mixing, discharging sand, and placing the sand in a container for later use;
s22, manually making a core, and baking for 20min in an oven at the temperature of 180 ℃ to obtain a molded resin sand core;
s3, preparing a high-strength and high-toughness die-casting sand core;
and (4) uniformly coating the coating in the step S1 on the outer peripheral wall of the formed resin sand core, controlling the thickness of the coating to be 1mm, and then baking in an oven at 150 ℃ for 180min to obtain the high-toughness die-casting sand core.
Preparation example 6
A high-strength and high-toughness die-casting sand core is prepared by the following steps:
s1, preparing a coating;
adding water into a stirring tank, then weighing 3Kg of glass fiber, 2Kg of argil, 5Kg of alumina, 38Kg of sodium silicate and 3Kg of titanium dioxide, adding into the stirring tank, supplementing water to 100L, and then stirring for 60min to obtain the coating;
s2, preparing a molding resin sand core;
s21, weighing 100Kg of quartz sand, 3Kg of furan resin and 5Kg of phosphoric acid solution, sequentially adding the weighed materials into a roller type sand mixer to be uniformly mixed, discharging sand, and placing the sand in a container for later use;
s22, manually making a core, and baking for 20min in an oven at the temperature of 180 ℃ to obtain a molded resin sand core;
s3, preparing a high-strength and high-toughness die-casting sand core;
and (4) uniformly coating the coating in the step S1 on the outer peripheral wall of the formed resin sand core, controlling the thickness of the coating to be 0.8mm, and then baking in an oven at 130 ℃ for 300min to obtain the high-strength high-toughness die-casting sand core.
Preparation example 7
A die-casting sand core differing from example 1 in that: in step S1, no glass fiber or polypropylene fiber is added.
Preparation example 8
A die casting sand core comprises the following preparation steps:
s11, weighing 100Kg of quartz sand, 3Kg of furan resin and 5Kg of phosphoric acid solution, sequentially adding the weighed materials into a roller type sand mixer to be uniformly mixed, discharging sand, and placing the sand in a container for later use;
and S12, manually making the core, and baking for 20min in an oven at the temperature of 180 ℃ to obtain the molded resin sand core.
Examples
Example 1
A die cast part formed by the steps of:
s1, loading the high-toughness die-casting sand core prepared in the preparation example 1 into a die-casting die of a die-casting machine (Toyo, 200 tons);
and S2, adding the aluminum liquid into a die casting machine for die casting, and cooling to obtain a die casting. The die casting parameters of the die casting machine are as follows: the temperature of the die is 200 ℃ and 220 ℃, the four-stage injection speed is respectively 0.13m/s, 0.3m/s, 0.6m/s and 4.2m/s, the high-speed ACC pressure is 13.6MPa, and the supercharging ACC pressure is 10 MPa.
Examples 2 to 6
A die casting differing from embodiment 1 in that: the high toughness die-casting sand core prepared in the preparation example 1 is correspondingly replaced by the high toughness die-casting sand core prepared in the preparation examples 2-6.
Example 7
A die cast part formed by the steps of:
s1, loading the high-toughness die-casting sand core prepared in the preparation example 1 into a die-casting die of a die-casting machine (Toyo, 200 tons);
and S2, adding the molten zinc into a die casting machine for die casting, and cooling to obtain a die casting. The die casting parameters of the die casting machine are as follows: the temperature of the die is 160 ℃, the four-stage injection speed is respectively 0.13m/s, 0.3m/s, 0.6m/s and 4.2m/s, the high-speed ACC pressure is 11.6MPa, and the supercharging ACC pressure is 8 MPa.
Example 8
A die cast part formed by the steps of:
s1, loading the high-toughness die-casting sand core prepared in the preparation example 1 into a die-casting die of a die-casting machine (Toyo, 200 tons);
and S2, adding the magnesium alloy liquid into a die casting machine for die casting, and cooling to obtain a die casting. The die casting parameters of the die casting machine are as follows: the temperature of the die is 160 ℃, the four-stage injection speed is respectively 0.13m/s, 0.3m/s, 0.6m/s and 3.2m/s, the high-speed ACC pressure is 10MPa, and the supercharging ACC pressure is 7 MPa.
Comparative example
Comparative example 1
A die cast part formed by the steps of:
s1, loading the high-toughness die-casting sand core prepared in the preparation example 7 into a die-casting die of a die-casting machine (Toyo, 200 tons);
and S2, adding the aluminum liquid into a die casting machine for die casting, and cooling to obtain a die casting.
Comparative example 2
A die casting distinguished from comparative example 1 in that: the casting sand core obtained in preparation example 7 was replaced with the casting sand core obtained in preparation example 8.
Performance testing experimental samples: 50 die castings were prepared as test samples according to the methods reported in examples 1 to 8 and comparative examples 1 to 2, respectively, and the die casting yields were observed, and the results are shown in Table 2.
| Intact number/piece | Number of damage/number | Percent of yield% | |
| Example 1 | 49 | 1 | 98 |
| Example 2 | 48 | 2 | 96 |
| Example 3 | 48 | 2 | 96 |
| Example 4 | 49 | 1 | 98 |
| Example 5 | 49 | 1 | 98 |
| Example 6 | 49 | 1 | 98 |
| Example 7 | 49 | 1 | 98 |
| Example 8 | 48 | 2 | 98 |
| Comparative example 1 | 4 | 46 | 8 |
| Comparative example 2 | 0 | 50 | 0 |
TABLE 2
As can be seen by combining examples 1 to 8 and comparative examples 1 to 2 with Table 2, the molding of the die cast article was ensured by forming a protective layer on the outer side wall of the resin core after thermosetting the resin core for molding while coating with the oil-added type I synthetic fibers.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The high-strength and high-toughness die-casting sand core is characterized by comprising a molding resin sand core and a protective layer, wherein the protective layer is uniformly coated on the outer side wall of the molding resin sand core;
the protective layer comprises the following components in parts by weight:
3-5 parts of I type synthetic fiber;
1-2 parts of argil;
5-7 parts of aluminum oxide;
26-38 parts of adhesive;
3-5 parts of titanium dioxide;
43-62 parts of water.
2. The high toughness diecastable core according to claim 1, wherein the protective layer has a thickness of 0.3-1 mm.
3. The high toughness diecastable core of claim 1, wherein the binder is sodium silicate.
4. The high toughness diecastable core of claim 1, wherein the class I synthetic fibers are glass fibers or polypropylene fibers.
5. The preparation method of the high-toughness die-casting sand core as claimed in claims 1 to 4, which is characterized by comprising the following preparation steps:
1.1, preparation of the coating: weighing I type synthetic fibers, argil, alumina powder, sodium silicate and titanium dioxide, and stirring for 50-80min to obtain a coating;
1.2, preparation of a molding resin sand core: uniformly mixing quartz sand, liquid casting resin and a curing agent, adding the mixture into a core box, and manually making cores to obtain a molded resin sand core;
1.3, uniformly coating the coating on the outer peripheral wall of the molded resin sand core, baking at the temperature of 130-150 ℃ for 180-300min, and forming a protective layer on the outer peripheral wall of the molded resin sand core by the coating, thus obtaining the high-strength and high-toughness die-casting sand core.
6. The method for preparing the high-toughness die-casting sand core according to claim 5, wherein the mass ratio of the quartz sand to the liquid casting resin to the curing agent is 100: (3-6): (2-8).
7. The method of claim 5, wherein the liquid casting resin is one of furan resin, liquid phenolic resin, and Pep-Set phenolic resin.
8. The method for preparing the high-toughness die-castable sand core according to claim 5, wherein the curing agent is p-toluenesulfonic acid aqueous solution, benzenesulfonic acid aqueous solution, NH4Aqueous Cl solution, aqueous copper sulfonate solution, CuCl2One or more of an aqueous solution and a phosphoric acid solution.
9. The die casting forming process is characterized by comprising the following preparation steps of:
1.1, loading the high-toughness diecastable sand core of claims 1-4 into a die-casting die of a die-casting machine;
and 1.2, adding molten metal into a die casting machine for die casting, and cooling to obtain a die casting.
10. A die casting forming process according to claim 9, wherein the die casting parameters of the die casting machine in the step 1.2 are as follows: the temperature of the die is 200 ℃ and 220 ℃, the four-stage injection speed is respectively 0.13m/s, 0.3m/s, 0.6m/s and 4.2m/s, the high-speed ACC pressure is 13.6MPa, and the supercharging ACC pressure is 10 MPa.
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| CN112846143B (en) | 2022-05-13 |
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