Preparation process of high borosilicate glass refrigerator drawer

Abstract

The invention belongs to the field of production processes of glass products, and particularly relates to a preparation process of a high borosilicate glass refrigerator drawer, which comprises the following steps: S1, preparing the following raw materials in percentage by weight: 70-75% of silicon dioxide, 10-15% of boric oxide, 2-4% of aluminum oxide, 0.2-1% of potassium oxide, 5-8% of sodium oxide, 2-4% of zinc oxide, 0-1% of lithium oxide and 0.1-1% of barium oxide; 0-0.5% of calcium oxide; mixing the raw materials; s2, melting is carried out; s3, molding: putting the molten glass into a pressing mold for pressing and molding; s4, performing smoothing treatment; according to the process, appropriate viscosity can be provided for compression molding of the large-size refrigerator drawer, and compression molding of the refrigerator drawer is facilitated.

Description

Technical Field

[0001] The invention belongs to the field of glass product production technology, and specifically relates to a preparation process of a high borosilicate glass refrigerator drawer. Background Art

[0002] Refrigerator drawers have high requirements for thermal stability, impact resistance and shock resistance. Ordinary glass cannot meet the requirements of refrigerator drawers. Due to the viscosity of glass, the glass pressing process is usually suitable for the production of round, small-sized glass parts with large draft angles, which are easy to form and demold. Existing refrigerator drawers are large-sized rectangles, and the parts are prone to cracks. The draft angle is small, and molding and demolding are difficult. Therefore, they are mostly made of flat glass splicing. The spliced ​​refrigerator drawers have poor aesthetics, and the splicing is easy to hide dirt and extremely difficult to clean, resulting in the continued existence of pollution sources in the refrigerator. Therefore, there is an urgent need for a preparation process that can integrally mold and press large-sized rectangular glass parts.

[0003] When pressing glass parts, it is difficult to achieve precise control of the amount of molten glass. In order to prevent inconsistent wall thickness of glass parts due to small amount, an overflow ring is usually set on the mold cavity of the pressing mold, and a slightly larger amount of molten glass than required for molding is put into the mold. After molding, the excess material formed in the overflow ring is eliminated through post-polishing to make the molded glass parts close to the designed dimensions. However, the excess material part is thicker and requires a longer time to polish, which affects production efficiency. Summary of the invention

[0004] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a preparation process of a high-borosilicate glass refrigerator drawer, which can provide suitable viscosity for the pressing and molding of large-sized refrigerator drawers, facilitate the pressing and molding of refrigerator drawers, and have uniform wall thickness. The prepared refrigerator drawer has a lower thermal expansion coefficient, better thermal stability, and high impact strength, which meets the use requirements of the refrigerator drawer.

[0005] The specific technical solution adopted by the present invention is:

[0006] A preparation process of a high borosilicate glass refrigerator drawer comprises the following steps:

[0007] S1. Ingredients, including raw materials in weight percentage: silicon dioxide: 70-75%, boron oxide: 10-15%, aluminum oxide: 2-4%, potassium oxide: 0.2-1%, sodium oxide: 5-8%, zinc oxide: 2-4%, lithium oxide: 0-1%, barium oxide: 0.1-1%, calcium oxide: 0-0.5%; mix the above raw materials;

[0008] S2, melting, melting the mixed raw materials into glass liquid;

[0009] S3, forming, putting the glass liquid into a pressing mold, and the pressing mold presses the glass liquid into shape to obtain a rough drawer part;

[0010] S4, smoothing treatment, demoulding the rough drawer, spraying flames on the surface of the rough drawer, melting and removing the sharp edges and burrs on the rough drawer;

[0011] S5: Annealing.

[0012] The pressing mold in step S3 includes a concave mold, a pressing plate and a movable punch. The concave mold, the pressing plate and the movable punch are matched to form a mold cavity. A group of overflow ports that are connected to the outside world and the mold cavity respectively are arranged between the movable punch and the pressing plate. The movable punch is provided with an elastic material component that matches the overflow port. The elastic material component has the freedom of extension and retraction on the movable punch. The pressing plate is provided with a punch avoidance slope located above the overflow port.

[0013] The width of the overflow port is 0.3-0.8 mm.

[0014] An inner air duct is arranged in the movable convex mold, and an air inlet and an air outlet of the inner air duct are respectively connected to an air inlet pipe and an air outlet pipe.

[0015] The ejection assembly includes a fixed block and an ejection rod arranged in sequence along the ejection direction. The fixed block is provided with a vent hole with one end connected to the internal air duct. The ejection rod is arranged in close contact with the fixed block to form a blockage on the other end of the vent hole. The air outlet duct is provided with a solenoid valve.

[0016] The ejecting rod is provided with exhaust holes, the exhaust holes and the vent holes are arranged alternately, and the exhaust holes and the overflow port are arranged at intervals, and the total area of ​​the exhaust holes is smaller than the area of ​​the vent holes.

[0017] The movable punch is provided with a stepped mounting hole, the spring assembly is installed with the aid of the mounting hole, the spring rod comprises a limit end and an ejection end respectively matched with the large and small apertures of the mounting hole, a return spring is connected between the limit end and the stepped surface of the mounting hole, and the limit end is fitted with the fixed block.

[0018] The movable punch is a bowl-shaped structure with an open upper end. A combination block is arranged in the movable punch and is fitted with the inner wall of the movable punch. The internal air duct includes a longitudinal section that penetrates the combination block in the longitudinal direction and a spiral section that is spirally coiled on the side wall of the combination block. The air inlet is arranged at the upper end of the longitudinal section, the air outlet is arranged at the upper end of the spiral section, and the air vent is connected to the spiral section.

[0019] The concave die is matched with a top block whose end is flush with the bottom of the die cavity.

[0020] A slag removal step is added between steps S3 and S4, and a negative pressure machine is used to absorb the residual material and residue of the drawer rough piece in the concave mold after the mold is opened.

[0021] The beneficial effects of the present invention are:

[0022] The present invention adjusts the ratio of raw materials and controls the temperature of glass liquid during molding, so that the glass liquid has a lower viscosity, which is conducive to pressing and molding, and the thickness of the refrigerator drawer after molding is consistent, and the surface is smooth and free of cracks;

[0023] The pressing mold is equipped with an overflow port and a supporting elastic component to ensure that the glass liquid can fill the mold cavity and automatically break off the overflowed excess material without the need for separate grinding.

[0024] An internal air duct is arranged in the movable punch to control the temperature of the movable punch, which helps to cool and harden the refrigerator drawer, and at the same time prevents the movable punch from sticking to the inner wall of the refrigerator drawer, thereby improving the smoothness of the inner wall of the refrigerator drawer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a pressing die;

[0026] Figure 2 is a top view of the pressing die;

[0027] Figure 3 for Figure 2 Cross-section of the middle AA;

[0028] Figure 4 for Figure 3 A magnified view of the part B in the middle;

[0029] Figure 5 for Figure 4 Schematic diagram of the state where the material rod is extended in the middle bomb;

[0030] Figure 6 This is a schematic diagram of the structure of the drawer rough part when the solenoid valve is not closed in step S3;

[0031] Figure 7 It is a structural schematic diagram of a refrigerator drawer;

[0032] Figure 8 It is a structural diagram of the combination block;

[0033] Fig. 9 It is a structural schematic diagram of the elastic material component;

[0034] In the accompanying drawings, 1, die, 2, pressure plate, 3, movable punch, 4, mold cavity, 5, overflow port, 6, punch avoidance slope, 7, inner air duct, 701, air inlet, 702, air outlet, 703, longitudinal section, 704, spiral section, 8, air inlet duct, 9, air outlet duct, 10, fixed block, 11, spring rod, 1101, limit end, 1102, ejection end, 12, vent, 13, solenoid valve, 14, exhaust hole, 15, mounting hole, 16, reset spring, 17, combination block, 18, ejector block, 19, drawer rough part. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0036] Example 1, a preparation process of a high borosilicate glass refrigerator drawer, comprising the following steps:

[0037] S1. Ingredients, including raw materials in weight percentage: silicon dioxide: 75%, boron oxide: 11%, aluminum oxide: 3.5%, potassium oxide: 1%, sodium oxide: 5%, zinc oxide: 2%, lithium oxide: 1%, barium oxide: 1%, calcium oxide: 0.5%; add the above raw materials into a mixer and mix them evenly; adjust the raw material ratio to make the viscosity of the glass liquid moderate, which is conducive to the pressing and molding of large parts

[0038] S2, melting, putting the mixed raw materials into an electric melting furnace for high temperature heating to melt into a uniform glass liquid without bubbles;

[0039] S3, forming, putting the glass liquid into the concave mold 1 in the pressing mold, closing the pressing mold to press the glass liquid into shape, cooling and demoulding, and obtaining the drawer rough part 19;

[0040] like Figure 1-5 As shown in , 8-9, the pressing mold includes a die 1, a pressing plate 2 and a movable punch 3. The die 1, the pressing plate 2 and the movable punch 3 form a mold cavity 4. A group of overflow ports 5 are provided between the movable punch 3 and the pressing plate 2, which are connected to the outside and the mold cavity 4 respectively. The movable punch 3 is provided with an elastic component matched with the overflow port 5. The elastic component has the freedom of extension and contraction on the movable punch 3. The pressing plate 2 is provided with a punch avoidance slope 6 located above the overflow port 5. The punch avoidance slope 6 shortens the height of the matching surface between the movable punch 3 and the pressing plate 2, which is easy to process and manufacture the mold; the punch avoidance slope 6 also provides a lateral movement space for the excess material overflowing from the overflow port 5, so that the elastic component can break the excess material at the height of the punch avoidance slope 6 during the lifting of the movable punch 3.

[0041] The pressing plate 2 and the movable punch 3 are located above the die 1.

[0042] The glass liquid is put into the concave mold 1, and the pressing plate 2 and the movable punch 3 move downward synchronously. The pressing plate 2 first contacts the concave mold 1, and then the pressing plate 2 stops moving. The movable punch 3 continues to move downward gradually until it contacts and squeezes the glass liquid, so that the glass liquid fills the mold cavity 4. A groove is provided on the matching surface of the pressing plate 2 and the movable punch 3 to form an overflow port 5, and the excess glass liquid in the mold cavity 4 overflows upward from the overflow port 5. Figure 6 As shown in FIG. 1 , after the workpiece is cooled, the movable punch 3 carrying the ejector assembly is first raised. During the raising process, the ejector assembly extends on the movable punch 3 to eject the excess material overflowing from the overflow port 5. Figure 5 As shown, the excess material is broken to ensure that the glass liquid can fill the mold cavity and reduce the time required for grinding; after the glass liquid overflows from the overflow port 5, it contacts with the outside air and quickly cools to form excess material. The excess material seals the overflow port 5 to prevent the glass liquid from continuing to overflow, thereby ensuring that the glass liquid in the mold cavity 4 is evenly filled.

[0043] The width of the overflow port 5 is 0.3-0.8 mm, preferably 0.5 mm in this embodiment. The glass liquid overflows from the overflow port 5 to the outside, forming a 0.5 mm thin glass strip at the overflow port 5, which is easy to break.

[0044] An inner air duct 7 is provided in the movable punch 3, and an air inlet 701 and an air outlet 702 of the inner air duct 7 are respectively connected to an air inlet duct 8 and an air outlet duct 9. Gas is blown into the inner air duct 7 with the aid of the air inlet duct 8, and the gas conducts the heat of the movable punch 3 through the air outlet duct 9, thereby controlling the temperature of the movable punch 3 and preventing the material from sticking due to excessive temperature of the movable punch 3, which helps to reduce the molding time and improve the surface smoothness of the drawer rough part.

[0045] Furthermore, the ejection assembly includes a fixed block 10 and an ejection rod 11 which are sequentially arranged along the ejection direction. The fixed block 10 is provided with an air vent 12 which is connected to the inner air duct 7 at one end. The ejection rod 11 is fitted with the fixed block 10 and forms a blockage on the other end of the air vent 12. The air outlet duct 9 is provided with a solenoid valve 13. During the pressing process, the solenoid valve 13 remains open, and the gas in the inner air duct 7 is discharged from the air outlet duct 9. The pressure in the inner air duct 7 is small, and the ejection rod 11 is located in the initial position. After the pressing and the drawer rough part is hardened, the solenoid valve 13 is closed during the rising process of the movable punch 3, the pressure in the inner air duct 7 increases, and the gas is discharged from the air vent 12. The gas pushes the ejection rod 11 out so that there is a gap between the ejection rod 11 and the fixed block 10, as shown in FIG. Figure 5 As shown, the ejecting rod 11 pushes the remaining material overflowing from the overflow port 5, and the remaining material breaks off, leaving only a part of the thin sheet connected to the drawer rough part.

[0046] Among them, the ejection rod 11 is provided with an exhaust hole 14, the exhaust hole 14 and the vent hole 12 are staggered, and the exhaust hole 14 and the overflow port 5 are spaced apart, and the excess material overflowing from the overflow port 5 will not enter the exhaust hole 14; the total area of ​​the exhaust hole 14 is smaller than the area of ​​the vent hole 12, when the ejection rod 11 is in contact with the fixed block 10, the ejection rod 11 blocks the vent hole 12, and after closing the solenoid valve 13, the ejection rod 11 is lifted up, and a gap is set between the ejection rod 11 and the fixed block 10, and the gas in the inner air duct 7 enters the gap between the ejection rod 11 and the fixed block 10 through the vent hole 12 and is discharged along the exhaust hole 14. Since the total area of ​​the exhaust hole 14 is smaller than the area of ​​the vent hole 12, the air pressure in the inner air duct 7 can keep the ejection rod 11 in the lifted state.

[0047] A stepped mounting hole 15 is provided on the movable punch 3, and the spring assembly is installed with the aid of the mounting hole 15. The spring rod 11 includes a limit end 1101 and an ejection end 1102 which are respectively matched with the large and small apertures of the mounting hole 15. A return spring 16 is connected between the limit end 1101 and the stepped surface of the mounting hole 15. The limit end 1101 is fitted with the fixed block 10. When the spring rod 11 is lifted up, the ejection end 1102 extends out of the movable punch 3 to break off the excess material, and the return spring 16 is compressed. When the solenoid valve 13 is opened, the pressure in the inner air duct 7 is reduced, and the return spring 16 drives the spring rod 11 to reset, and the limit end 1101 is fitted with the fixed block 10 again.

[0048] The movable punch 3 is a bowl-shaped structure with an open upper end. A combination block 17 is arranged in the movable punch 3 and is fitted with the inner wall of the movable punch 3. The inner air duct 7 includes a longitudinal section 703 that penetrates the combination block 17 in the longitudinal direction and a spiral section 704 that is spirally coiled on the side wall of the combination block 17. The air inlet 701 is arranged at the upper end of the longitudinal section 703, and the air outlet 702 is arranged at the upper end of the spiral section 704. The vent 12 is connected with the spiral section 704. The air inlet duct 8 blows gas into the inner duct 7 with the aid of the air inlet 701. The gas is cooled by contact between the longitudinal section 703 and the bottom of the movable punch 3, and rises spirally along the spiral section 704 to cool the side wall of the movable punch 3, thereby achieving uniform cooling of the movable punch 3, improving the molding quality of the drawer rough part, and avoiding adhesion between the movable punch 3 and the inner wall of the drawer rough part.

[0049] The die 1 is equipped with a top block 18 whose end is flush with the bottom of the cavity 4. After pressing and forming, the movable punch 3 rises first, and then the pressing plate 2 and the movable punch 3 rise synchronously to open the mold and separate the drawer rough part. Then, the residual material residue of the drawer rough part in the die 1 is adsorbed by the negative pressure machine, and finally the top block 18 is pushed into the cavity 4 to lift the drawer rough part out of the cavity 4 to prevent the drawer assembly from being stuck with the die 1 and causing difficulty in demolding.

[0050] S4, smoothing treatment, demoulding the drawer rough piece 19, spraying flames on the surface of the drawer rough piece 19, melting and eliminating the sharp edges and burrs on the drawer rough piece 19, and softening and melting the thin slice formed by the overflow port 5 by the flames, so that the edges of the drawer rough piece 19 are rounded, and there is no need to grind the remaining material separately;

[0051] S5: Annealing, heating, heat preservation and cooling the drawer rough piece 19 in sequence to achieve annealing, and obtain a refrigerator drawer. Figure 7 shown.

[0052] Example 2 is basically the same as Example 1, except that the weight percentage of the raw materials is different, wherein the raw materials include silicon dioxide: 72%, boron oxide: 15%, aluminum oxide: 2%, potassium oxide: 0.5%, sodium oxide: 6%, zinc oxide: 3.2%, lithium oxide: 0.7%, barium oxide: 0.5%, and calcium oxide: 0.1%.

[0053] Example 3 is basically the same as Example 1, except that the weight percentage of the raw materials is different, wherein the raw materials include silicon dioxide: 70%, boron oxide: 13%, aluminum oxide: 4%, potassium oxide: 0.2%, sodium oxide: 8%, zinc oxide: 4%, lithium oxide: 0.2%, barium oxide: 0.3%, and calcium oxide: 0.3%.

Claims

1. A preparation process for a high borosilicate glass refrigerator drawer, characterized in that: The following steps are included: S1. Ingredients, including raw materials in weight percentage: silicon dioxide: 70-75%, boron oxide: 10-15%, aluminum oxide: 2-4%, potassium oxide: 0.2-1%, sodium oxide: 5-8%, zinc oxide: 2-4%, lithium oxide: 0-1%, barium oxide: 0.1-1%, calcium oxide: 0-0.5%; mix the above raw materials; S2, melting, melting the mixed raw materials into glass liquid; S3, forming, putting the glass liquid into a pressing mold, and the pressing mold presses the glass liquid to form a rough drawer part (19); S4, smoothing treatment, demoulding the drawer rough piece (19), spraying flames on the surface of the drawer rough piece (19), melting and removing the sharp edges and burrs on the drawer rough piece (19); S5: Annealing.

2. The preparation process of a high borosilicate glass refrigerator drawer according to claim 1, characterized in that: The pressing mold in step S3 comprises a concave mold (1), a pressing plate (2) and a movable punch (3); the concave mold (1), the pressing plate (2) and the movable punch (3) are matched to form a mold cavity (4); a group of overflow ports (5) are respectively connected to the outside and the mold cavity (4) between the movable punch (3) and the pressing plate (2); an elastic material component matched with the overflow port (5) is arranged on the movable punch (3); the elastic material component has the freedom of extension and contraction on the movable punch (3); and a punch avoidance slope (6) located above the overflow port (5) is arranged on the pressing plate (2).

3. The preparation process of a high borosilicate glass refrigerator drawer according to claim 2, characterized in that: The width of the overflow port (5) is 0.3-0.8 mm.

4. The preparation process of a high borosilicate glass refrigerator drawer according to claim 2, characterized in that: An internal air duct (7) is provided in the movable punch (3), and an air inlet (701) and an air outlet (702) of the internal air duct (7) are respectively connected to an air inlet duct (8) and an air outlet duct (9).

5. The preparation process of a high borosilicate glass refrigerator drawer according to claim 4, characterized in that: The ejection assembly comprises a fixed block (10) and an ejection rod (11) which are arranged in sequence along the ejection direction; the fixed block (10) is provided with a vent hole (12) whose one end is connected to the inner air duct (7); the ejection rod (11) and the fixed block (10) are arranged in close contact with each other to form a blockage on the other end of the vent hole (12); and the air outlet duct (9) is provided with a solenoid valve (13).

6. The process for preparing a high borosilicate glass refrigerator drawer according to claim 5, characterized in that: The ejecting rod (11) is provided with an exhaust hole (14), the exhaust hole (14) and the vent hole (12) are arranged alternately, and the exhaust hole (14) and the overflow port (5) are arranged at intervals, and the total area of ​​the exhaust hole (14) is smaller than the area of ​​the vent hole (12).

7. The preparation process of a high borosilicate glass refrigerator drawer according to claim 6, characterized in that: The movable punch (3) is provided with a stepped mounting hole (15), the spring assembly is installed with the aid of the mounting hole (15), the spring rod (11) comprises a limiting end (1101) and an ejection end (1102) respectively matched with the large and small apertures of the mounting hole (15), a return spring (16) is connected between the limiting end (1101) and the stepped surface of the mounting hole (15), and the limiting end (1101) is fitted with the fixing block (10).

8. The process for preparing a high borosilicate glass refrigerator drawer according to claim 5, characterized in that: The movable punch (3) is a bowl-shaped structure with an open upper end. A combination block (17) is arranged in the movable punch (3) and is fitted with the inner wall of the movable punch (3). The inner air duct (7) includes a longitudinal section (703) that penetrates the combination block (17) in the longitudinal direction and a spiral section (704) that is spirally wound on the side wall of the combination block (17). The air inlet (701) is arranged at the upper end of the longitudinal section (703), the air outlet (702) is arranged at the upper end of the spiral section (704), and the air vent (12) is connected to the spiral section (704).

9. The preparation process of a high borosilicate glass refrigerator drawer according to claim 2, characterized in that: The female mold (1) is matched with a top block (18) whose end is flush with the bottom of the mold cavity (4).

10. The process for preparing a high borosilicate glass refrigerator drawer according to claim 2, characterized in that: A slag removal step is added between the steps S3 and S4, and a negative pressure machine is used to absorb the residual material and residue of the drawer rough piece in the concave mold (1) after the mold is opened.

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