Injection mold and method for injection molding of light guide plate

Abstract

The invention provides an injection mold for injection molding of a light guide plate and a method thereof.A cross rod is installed in a base, a clamping ring is arranged on one side of the cross rod, a rotating ball is rotationally connected to the inner wall of the clamping ring, a top ring is connected to the end, away from the clamping ring, of the rotating ball in a swinging mode, and the clamping ring is installed on the two sides in the base through the cross rod and is in a circular ring shape; the clamping ring vertically corresponds to the pressing plate, the top ring is vertically arranged, the top ring is in a semi-arc shape, the angle of the semi-arc is 200-220 degrees, the top ring takes the rotating sphere as the center, the lengths of the two ends of the top ring are the same, inner cavities are formed in the two ends of the top ring, the interiors of the two ends of the top ring are slidably nested and connected with a lantern ring and a sliding ring, and the end, close to the lantern ring, of the sliding ring is surrounded by an outer ring; after the light guide plate is subjected to pouring forming, when the light guide plate is not completely cooled, the pressing plate can be assisted to move upwards according to the thermal expansion and cold contraction principle, and then the movement of the pressing plate can assist the light guide plate in rapid demolding.

Description

Technical Field

[0001] The invention relates to the technical field of plastic molding and processing, in particular to an injection mold for an injection light guide plate and a method thereof. Background Art

[0002] The light guide plate is made of optical grade acrylic or PC sheet to improve the efficiency of light use. The light guide plate needs to be extruded through an injection mold during processing. Generally, the injection mold consists of a movable mold and a fixed mold. The movable mold is installed on the movable mold of the injection molding machine, and the fixed mold is installed on the fixed mold of the injection molding machine. During injection molding, the movable mold and the fixed mold are closed to form a pouring system and a cavity. When the mold is opened, the movable mold and the fixed mold are separated to take out the light guide plate. This is a technical inspiration for injection molds; The following problems were found in the study of injection molds: The raw material of the light guide plate is PC sheet, which is melted at high temperature and poured into the injection mold for molding. After the injection mold stamps the light guide plate, the upper and lower parts of the injection mold need to be separated, and the light guide plate is completely cooled before being taken out from the injection mold. Therefore, when the light guide plate is not completely cooled, the injection mold cannot assist in taking out the light guide plate, and it is impossible to avoid the deformation of the light guide plate due to external force when it is taken out before being completely cooled. At present, CN201110182097.9 in the prior art discloses an injection molding mold for a light guide plate, wherein a piston insert is fixedly connected to a first top plate via a guide column; the other side of the first top plate is also fixedly connected to a second top plate via a fastening bolt; a positioning ejector rod parallel to the guide column is also provided, one end of the positioning ejector rod is clamped between the first top plate and the second top plate, and the other end passes through the first top plate and the moving mold plate in sequence, and its end face exceeds the outer end face of the piston insert, which can make the pressure at various places in the rubber molding process uniform, so that the internal stress of the molded light guide plate is extremely low and uniform, solving the problem of uneven brightness of the light guide plate molded by the existing injection mold, and realizing multiple uses of one mold; The present invention can mainly solve the problem that when the light guide plate is not completely cooled, the injection mold cannot assist in taking out the light guide plate. Summary of the invention

[0003] The object of the present invention is to provide an injection mold for an injection light guide plate and a method thereof.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an injection mold for an injection light guide plate and a method thereof, comprising a fixed mold and a movable mold, the fixed mold and the movable mold are vertically interlocked and docked, the interior of the fixed mold is slidably nested and connected with a pressure plate, and the lower end of the pressure plate is slidably fitted with a base.

[0005] As a further solution of the present invention: the fixed mold is located below the movable mold, an inner cavity is opened inside the fixed mold, the pressing plate and the base are located inside the inner cavity, and the inner cavity is a casting cavity.

[0006] As a further solution of the present invention: the base is installed at the bottom of the fixed mold cavity, the pressure plate slides vertically inside the fixed mold cavity, the pressure plate slides vertically in the fixed mold cavity, and the base surrounds the bottom of the pressure plate.

[0007] As a further solution of the present invention: a cross bar is installed inside the base, a clamping ring is provided on one side of the cross bar, a rotating sphere is rotatably connected to the inner wall of the clamping ring, and a top ring is swingably connected to one end of the rotating sphere away from the clamping ring.

[0008] As a further solution of the present invention: the clamping ring is installed on both sides of the base through a cross bar, the clamping ring is in a circular ring shape, and the clamping ring and the pressure plate are vertically corresponding.

[0009] As a further solution of the present invention: the top ring is arranged vertically, the top ring is in a semicircular arc shape, the semicircular arc angle is 200-220°, the top ring is centered on the rotating sphere, the two ends of the top ring are the same length, and inner cavities are opened at both ends of the top ring.

[0010] As a further solution of the present invention: the inner sliding nests at both ends of the top ring are connected with a sleeve ring and a sliding ring, and an outer ring surrounds one end of the sliding ring close to the sleeve ring.

[0011] As a further solution of the present invention: the sleeve ring and the sliding ring are slidably nested in multiple sections, the sliding ring and the sleeve ring are in a closed state as a whole, the sliding ring is slidably nested with the sleeve ring through the outer ring, and the sliding ring and the sleeve ring are filled with mercury.

[0012] As a further solution of the present invention: the outer ring is in a circular ring shape, and the outer ring slides on the inner side of the sleeve ring. The inner wall of the sleeve ring is provided with a sliding groove, and the outer ring slides on the inner side of the sliding groove.

[0013] As a further solution of the present invention: the method comprises the following steps. The specific operation steps are as follows: S1: First, the fixed mold and the movable mold are placed inside the punching machine, and the light guide plate raw material is poured into the inner cavity of the fixed mold. The raw material falls to the upper end of the pressing plate, and then the movable mold is vertically embedded with the fixed mold, and the upper end of the movable mold is punched by the punching machine; S2: When the light guide plate raw material enters the fixed mold, the temperature inside the fixed mold rises. The top ring is arranged vertically, and the temperature of the sliding ring and the sleeve ring on the top ring rises first. The sliding ring and the sleeve ring are filled with mercury, and the mercury expands the inside of the sliding ring and the sleeve ring according to the principle of thermal expansion and contraction. S3: The mercury expands and impacts one side of the outer ring, causing the sliding ring to slide on one side of the sleeve ring through the outer ring. At this time, the overall length of the sliding ring and the outer ring at the upper end of the top ring increases, thereby causing the center of gravity of the upper end of the top ring to tilt, and the upper part of the top ring can be tilted and swung toward the side away from the rotating sphere through the rotating sphere; S4: The upper part of the top ring can be pressed to the lower part of the pressing plate during the tilting and swinging process, and the pressing plate slides upward inside the fixed mold, thereby assisting the light guide plate on the upper end of the pressing plate to be quickly demolded from the inner side of the fixed mold; S5: After the light guide plate is demoulded, it is manually squeezed to the upper end of the pressing plate. The pressing plate can be pressed downward on the inner side of the fixed mold, and then the pressing plate can assist the top ring to tilt and reset as a whole. At the same time, as the pressing plate cools as a whole, the sliding ring and the sleeve ring can slide and reset as a whole. S6: The punching machine assists the movable mold and the fixed mold to form a tight fit, and then the light guide plate is cooled and formed at the upper end of the pressing plate. After forming, the movable mold is taken out from the upper end of the fixed mold. Beneficial Effects

[0014] 1. When the light guide plate raw material enters the fixed mold, the temperature inside the fixed mold rises. The top ring is arranged vertically, and the temperature of the sliding ring and the sleeve ring at the upper end of the top ring rises first. The sliding ring and the sleeve ring are filled with mercury. The mercury expands inside the sliding ring and the sleeve ring according to the principle of thermal expansion and contraction. The mercury expands and impacts one side of the outer ring, so that the sliding ring slides on one side of the sleeve ring through the outer ring. At this time, the overall length of the sliding ring and the outer ring at the upper end of the top ring increases, thereby tilting the center of gravity of the upper end of the top ring. The upper part of the top ring can be tilted and swung toward the side away from the rotating sphere through the rotating sphere. The upper part of the top ring can be squeezed to the bottom of the pressing plate during the tilting and swinging process, and the pressing plate slides upward inside the fixed mold, thereby assisting the light guide plate on the upper end of the pressing plate to be quickly demolded from the inner side of the fixed mold; 2. After the light guide plate is demoulded, it is manually squeezed to the upper end of the pressing plate. The pressing plate can be pressed downward on the inner side of the fixed mold, and then the pressing plate can assist the top ring to tilt and reset as a whole. At the same time, as the pressing plate cools as a whole, the sliding ring and the sleeve ring can slide and reset as a whole, which is convenient for the fixed mold to demould the light guide plate again; 3. Through the above steps, after the light guide plate is cast and formed, when the light guide plate is not completely cooled, the principle of thermal expansion and contraction can be used to assist the pressure plate to move upward, and then the movement of the pressure plate can assist the light guide plate to be quickly demolded, thereby avoiding the situation in which the existing injection mold needs to completely cool the light guide plate before demolding. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the fixed mold structure of the present invention.

[0017] Figure 3It is a schematic diagram of the movable mold structure of the present invention.

[0018] Figure 4 It is a schematic diagram of the local structure of the fixed mold of the present invention.

[0019] Figure 5 It is a schematic diagram of the structure of the pressing plate of the present invention when viewed from above.

[0020] Figure 6 It is a schematic diagram of the clamping ring structure of the present invention.

[0021] Figure 7 It is a schematic cross-sectional view of the top ring of the present invention.

[0022] Figure 8 It is a schematic diagram of the ring structure of the present invention.

[0023] Fig. 9 For the present invention Figure 8 Schematic diagram of the middle ring viewed from above.

[0024] Figure 1-9 In: 1-fixed mold, 101-movable mold, 102-pressing plate, 103-base, 104-cross bar, 2-clamping ring, 201-rotating sphere, 202-top ring, 3-sleeve ring, 301-sliding ring, 302-outer ring. DETAILED DESCRIPTION

[0025] See also Figure 1-9 In the embodiment of the present invention, Embodiment 1: A light guide plate injection mold and method thereof, comprising a fixed mold 1 and a movable mold 101, the fixed mold 1 and the movable mold 101 are vertically interlocked and butted, a pressing plate 102 is slidably nested inside the fixed mold 1, and a base 103 is slidably fitted at the lower end of the pressing plate 102; Among them: the fixed mold 1 is located below the movable mold 101, and an inner cavity is opened inside the fixed mold 1, and the pressing plate 102 and the base 103 are located inside the inner cavity, and the inner cavity is a casting cavity; The pressing plate 102 and the base 103 are installed at the bottom of the inner cavity of the fixed mold 1. The pressing plate 102 slides vertically inside the inner cavity of the fixed mold 1. The pressing plate 102 slides vertically in the inner cavity of the fixed mold 1. The base 103 surrounds the bottom of the pressing plate 102. The pressing plate 102 is vertically slidably fitted in the inner cavity of the fixed mold 1. When the pressing plate 102 slides upward, the base 103 surrounds the bottom of the pressing plate 102. When the pressing plate 102 does not slide upward, the base 103 and the pressing plate 103 are vertically attached. Figure 5 As shown; The base 103 is made of rubber. When the temperature inside the fixed mold 1 is high, the base 103 expands as a whole due to the principle of thermal expansion and contraction. At this time, the base 103 further fits the inner wall of the fixed mold 1, which can prevent the light guide plate raw material from flowing to the bottom of the base 103 through the gap between the pressing plate 102 and the inner cavity of the fixed mold 1. Among them: firstly, the fixed mold 1 and the movable mold 101 are placed inside the punching machine, the light guide plate raw material is poured into the inner cavity of the fixed mold 1, and the raw material falls to the upper end of the pressing plate 102, and then the movable mold 101 is vertically embedded with the fixed mold 1, and the upper end of the movable mold 101 is punched by using the punching machine; The punching machine assists the movable mold 101 and the fixed mold 1 to form a tight fit, and then the light guide plate is cooled and formed at the upper end of the pressing plate 102. After forming, the movable mold 101 is taken out from the upper end of the fixed mold 1, and the light guide plate inside the fixed mold 1 is cooled to complete the injection molding process of the light guide plate; Example 2: Refer to the attached manual Figure 2-6 It can be seen that the difference between Example 2 and Example 1 is that a crossbar 104 is installed inside the base 103, a clamping ring 2 is provided on one side of the crossbar 104, a rotating sphere 201 is rotatably connected to the inner wall of the clamping ring 2, and a top ring 202 is swingably connected to the end of the rotating sphere 201 away from the clamping ring 2; Among them: a cross bar 104 and a snap ring 2, the snap ring 2 is installed on both sides of the inside of the base 103 through the cross bar 104, the snap ring 2 is annular, and the snap ring 2 is vertically corresponding to the pressure plate 102; The rotating sphere 201 and the top ring 202 are arranged vertically, and the top ring 202 is in a semicircular arc shape with an angle of 200-220°. The top ring 202 is centered on the rotating sphere 201, and the two ends of the top ring 202 are the same length, and both ends of the top ring 202 are provided with inner cavities; There are multiple groups of rotating spheres 201 and top rings 202, and the rotating spheres 201 and top rings 202 are evenly arranged on the inner side of the clamping ring 2; The top ring 202 is semicircular, and the angle of the semicircular is 200-220 degrees. Therefore, when the top ring 202 is not swinging, the top ring 202 is vertically oriented. At this time, the upper end of the top ring 202 is 0.5-1 cm away from the lower end of the pressing plate 102. When the inner cavity of the fixed mold 1 is filled with the light guide plate raw material, the pressing plate 102 and the base 103 are vertically fitted and pressed tightly, and the top ring 202 is suspended on the inner side of the clamping ring 2 through the rotating sphere 201, and the top of the top ring 202 is spaced 0.5-1 cm from the lower end of the pressing plate 102; Example 3: Refer to the attached manual Figure 6-9 It can be seen that the difference between Example 3 and Examples 1 and 2 is that the two ends of the top ring 202 are internally slidably nested with the collar 3 and the sliding ring 301, and the end of the sliding ring 301 close to the collar 3 is surrounded by the outer ring 302; Wherein: the sleeve ring 3 and the sliding ring 301 are slidably nested in multiple sections, the sliding ring 301 and the sleeve ring 3 are in a closed state as a whole, the sliding ring 301 is slidably nested with the sleeve ring 3 through the outer ring 302, and the sliding ring 301 and the sleeve ring 3 are filled with mercury; The sleeve ring 3 and the sliding ring 301 are nested in multiple sections, and the sliding ring 301 and the sleeve ring 3 are in a closed state as a whole. Figure 8 and 9 As shown; The outer ring 302 is in the shape of a ring. The outer ring 302 slides on the inner side of the sleeve ring 3. A sliding groove is provided on the inner wall of the sleeve ring 3. The outer ring 302 slides on the inner side of the sliding groove. The inner wall of the collar 3 is provided with a sliding groove, and the outer ring 302 slides on the inner side of the sliding groove to prevent the sliding ring 301 from falling off from the collar 3; When the light guide plate raw material enters the fixed mold 1, the temperature inside the fixed mold 1 rises. The top ring 202 is arranged vertically. The temperature of the sliding ring 301 and the sleeve ring 3 at the upper end of the top ring 202 rises first. The sliding ring 301 and the sleeve ring 3 are filled with mercury. The mercury expands inside the sliding ring 301 and the sleeve ring 3 according to the principle of thermal expansion and contraction. The mercury expands and impacts one side of the outer ring 302, so that the sliding ring 301 slides on one side of the sleeve ring 3 through the outer ring 302. At this time The overall length of the sliding ring 301 and the outer ring 302 at the upper end of the top ring 202 is increased, so that the center of gravity of the upper end of the top ring 202 is tilted, and the upper end of the top ring 202 can be tilted and swung toward the side away from the rotating sphere 201 through the rotating sphere 201. The upper end of the top ring 202 can be squeezed to the lower side of the pressing plate 102 during the tilting and swinging process, and the pressing plate 102 slides upward inside the fixed mold 1, thereby assisting the light guide plate at the upper end of the pressing plate 102 to be quickly demolded from the inner side of the fixed mold 1; After the light guide plate is demoulded, it is manually squeezed to the upper end of the pressing plate 102, and the pressing plate 102 can be pressed downward on the inner side of the fixed mold 1, so that the pressing plate 102 can assist the top ring 202 to tilt and reset as a whole. At the same time, as the pressing plate 102 cools as a whole, the sliding ring 301 and the sleeve ring 3 can slide and reset as a whole, which is convenient for the fixed mold 1 to demould the light guide plate again; Example

[0026] The method comprises the following steps: S1: First, the fixed mold 1 and the movable mold 101 are placed inside the punching machine, and the light guide plate raw material is poured into the inner cavity of the fixed mold 1. The raw material falls to the upper end of the pressing plate 102, and then the movable mold 101 is vertically embedded with the fixed mold 1, and the upper end of the movable mold 101 is punched by using the punching machine; S2: When the light guide plate raw material enters the fixed mold 1, the temperature inside the fixed mold 1 increases. The top ring 202 is arranged vertically, and the temperature of the sliding ring 301 and the sleeve ring 3 at the upper end of the top ring 202 increases first. The sliding ring 301 and the sleeve ring 3 are filled with mercury, and the mercury expands inside the sliding ring 301 and the sleeve ring 3 according to the principle of thermal expansion and contraction. S3: The mercury expands and impacts one side of the outer ring 302, so that the sliding ring 301 slides on one side of the sleeve ring 3 through the outer ring 302. At this time, the overall length of the sliding ring 301 and the outer ring 302 at the upper end of the top ring 202 increases, thereby causing the center of gravity of the upper end of the top ring 202 to tilt, and the upper part of the top ring 202 can be tilted and swung toward the side away from the rotating sphere 201 through the rotating sphere 201; S4: The top of the top ring 202 can be pressed to the bottom of the pressing plate 102 during the tilting and swinging process, and the pressing plate 102 slides upward inside the fixed mold 1, thereby assisting the light guide plate on the upper end of the pressing plate 102 to be quickly demolded from the inner side of the fixed mold 1; S5: After the light guide plate is demoulded, it is manually squeezed to the upper end of the pressing plate 102. The pressing plate 102 can be pressed downward on the inner side of the fixed mold 1, and then the pressing plate 102 can assist the top ring 202 to tilt and reset as a whole. At the same time, as the pressing plate 102 cools as a whole, the sliding ring 301 and the sleeve ring 3 can slide and reset as a whole; S6: The punching machine assists the movable mold 101 and the fixed mold 1 to form a tight fit, and then the light guide plate is cooled and formed at the upper end of the pressing plate 102. After forming, the movable mold 101 is taken out from the upper end of the fixed mold 1; Through the above steps, after the light guide plate is cast and formed, when the light guide plate has not completely cooled down, the principle of thermal expansion and contraction can be used to assist the pressing plate 102 to move upward, and then the movement of the pressing plate 102 can assist the light guide plate to be quickly demolded, thereby avoiding the situation in which the existing injection mold needs to completely cool the light guide plate before demolding.

[0027] The above are only preferred embodiments of the present invention. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention. These should also be regarded as the protection scope of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. An injection mold for an injection light guide plate, characterized in that: include The fixed mold (1) and the movable mold (101) are vertically interlocked and butted, the interior of the fixed mold (1) is slidably nested with a pressing plate (102), and the lower end of the pressing plate (102) is slidably fitted with a base (103); The fixed mold (1) is located below the movable mold (101), an inner cavity is provided inside the fixed mold (1), a pressing plate (102) and a base (103) are located inside the inner cavity, and the inner cavity is a casting cavity.

2. The injection mold for injection-molded light guide plate according to claim 1, characterized in that: The base (103) is installed at the bottom of the inner cavity of the fixed mold (1), the pressing plate (102) slides vertically inside the inner cavity of the fixed mold (1), the pressing plate (102) slides vertically in the inner cavity of the fixed mold (1), and the base (103) surrounds the bottom of the pressing plate (102).

3. The injection mold for injection-molded light guide plate according to claim 1, characterized in that: A crossbar (104) is installed inside the base (103), a clamping ring (2) is provided on one side of the crossbar (104), a rotating sphere (201) is rotatably connected to the inner wall of the clamping ring (2), and an end of the rotating sphere (201) away from the clamping ring (2) is swingably connected to a top ring (202).

4. The injection mold for injection-molded light guide plate according to claim 3, characterized in that: The clamping ring (2) is installed on both sides of the inside of the base (103) via a cross bar (104); the clamping ring (2) is in a circular ring shape, and the clamping ring (2) corresponds vertically to the pressing plate (102).

5. The injection mold for injection-molded light guide plate according to claim 3, characterized in that: The top ring (202) is arranged vertically, is semicircular in shape, has a semicircular angle of 200-220°, is centered on the rotating sphere (201), has two ends of the top ring (202) of the same length, and has inner cavities at both ends of the top ring (202).

6. The injection mold for injection-molded light guide plate according to any one of claims 1 or 3, characterized in that: The two ends of the top ring (202) are internally slidably nested with a sleeve ring (3) and a sliding ring (301), and one end of the sliding ring (301) close to the sleeve ring (3) is surrounded by an outer ring (302).

7. The injection mold for injection-molded light guide plate according to claim 6, characterized in that: The sleeve ring (3) and the sliding ring (301) are slidably nested in multiple sections, the sliding ring (301) and the sleeve ring (3) are in a closed state as a whole, and the sliding ring (301) is slidably nested with the sleeve ring (3) via the outer ring (302).

8. The injection mold for injection-molded light guide plate according to claim 6, characterized in that: The outer ring (302) is in the shape of a circular ring, and the outer ring (302) slides on the inner side of the sleeve ring (3). A sliding groove is provided on the inner wall of the sleeve ring (3), and the outer ring (302) slides on the inner side of the sliding groove.

9. The injection mold for injection-molded light guide plate according to claim 6, characterized in that: The sliding ring (301) and the sleeve ring (3) are filled with mercury.

10. A method for injection molding a light guide plate mold, characterized in that: According to the injection mold for the injection light guide plate according to claims 1-9, the method comprises the following steps: S1: firstly, the fixed mold (1) and the movable mold (101) are placed inside a punching machine, and the light guide plate raw material is poured into the inner cavity of the fixed mold (1), and the raw material falls to the upper end of the pressing plate (102), and then the movable mold (101) and the fixed mold (1) are vertically engaged, and the upper end of the movable mold (101) is punched using a punching machine; S2: When the light guide plate raw material enters the interior of the fixed mold (1), the temperature inside the fixed mold (1) rises, and the top ring (202) is arranged vertically. The temperature of the sliding ring (301) and the sleeve ring (3) at the upper end of the top ring (202) rises first, and the interior of the sliding ring (301) and the sleeve ring (3) are filled with mercury, and the mercury expands inside the sliding ring (301) and the sleeve ring (3) according to the principle of thermal expansion and contraction; S3: The mercury expands and impacts one side of the outer ring (302), causing the sliding ring (301) to slide on one side of the sleeve ring (3) through the outer ring (302). At this time, the overall length of the sliding ring (301) and the outer ring (302) at the upper end of the top ring (202) increases, thereby causing the center of gravity of the upper end of the top ring (202) to tilt, and the upper part of the top ring (202) can be tilted and swung toward a side away from the rotating sphere (201) through the rotating sphere (201); S4: The upper part of the top ring (202) can be pressed to the lower part of the pressing plate (102) during the tilting and swinging process, and the pressing plate (102) slides upward inside the fixed mold (1), thereby assisting the light guide plate at the upper end of the pressing plate (102) to be quickly demoulded from the inner side of the fixed mold (1); S5: After the light guide plate is demoulded, it is manually squeezed to the upper end of the pressing plate (102), and the pressing plate (102) can be pressed downward on the inner side of the fixed mold (1), so that the pressing plate (102) can assist the top ring (202) to be tilted and reset as a whole. At the same time, as the pressing plate (102) is cooled as a whole, the sliding ring (301) and the sleeve ring (3) can be slid and reset as a whole; S6: The punching machine assists the movable mold (101) and the fixed mold (1) to form a tight fit, and then the light guide plate is cooled and formed at the upper end of the pressing plate (102). After forming, the movable mold (101) is removed from the upper end of the fixed mold (1).

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