TWI860211B - Injection mold - Google Patents

Abstract

An injection mold includes a male mold, a female mold and a first guiding portion. The male mold includes a mold core, a gridded groove and a plurality of lumpy portions. The gridded groove is concavely formed on the mold core to surround and define these lumpy portions therein. The female mold and the male mold are shut together to form an injection molding cavity therebetween. The injection molding cavity includes the gridded groove, and is used for receiving molten plastic. The first guiding portion includes a raised portion and a diversion trench. The protruding portion is located within the gridded groove and extends towards the female mold. The diversion trench is arranged on the raised portion and the gridded groove to separate the raised portion into two flow-pressurizing portions. A long axis direction of the diversion trench is parallel to a long axis direction of the mold core.

Description

Injection molding mold

The present invention relates to an injection molding die, and more particularly to an injection molding die for manufacturing a frame housing.

Generally speaking, in the field of injection molding technology, the keyboard frame production pass rate is not high because the keyboard frame after molding and cooling is quite narrow and weak. In addition, because the intersection area of the keyboard frame is prone to form a concave mark, it not only affects the keyboard frame production pass rate, but also affects the overall appearance of the keyboard frame.

However, even though the industry has proposed many improvement measures (such as thinning the intersection area), these measures not only cannot completely solve the above problems, but also have the disadvantages of greatly shortening the mold life and increasing the mold maintenance cost due to the high molding injection speed and pressure.

It can be seen that the above-mentioned technology still has inconveniences and defects, which are problems that the industry needs to solve urgently.

One purpose of the present invention is to provide an injection molding die to solve the difficulties mentioned in the above prior art.

One embodiment of the present invention provides an injection molding mold. The injection molding mold includes a male mold, a female mold and at least one first guide portion. The male mold includes a mold body, a grid groove and a plurality of block-shaped protrusions. The grid groove is recessed on one surface of the mold body and surrounds and defines these block-shaped protrusions. The female mold is used to form an injection cavity including the grid groove after being molded with the male mold along a mold clamping direction, and the injection cavity is used for injecting a molten plastic. The first guide portion includes a raised portion and a diverter groove. The raised portion is in the grid groove and extends in the direction of the female mold. The diverter groove is provided on the raised portion and the grid groove, and separates the raised portion into two guide portions. The long axis direction of the diverter groove is parallel to the long axis direction of the mold body.

According to one or more embodiments of the present invention, in the above-mentioned injection molding mold, these block-shaped protrusions include a first block-shaped protrusion, a second block-shaped protrusion and a third block-shaped protrusion. The first block-shaped protrusion and the second block-shaped protrusion are arranged in sequence along the long axis direction of the mold body. The grid groove includes a first linear segment and a second linear segment connected to each other. The long axis direction of the first linear segment is parallel to the long axis direction of the mold body, and is orthogonal to the long axis direction of the second linear segment. The second linear segment separates the first block-shaped protrusion and the second block-shaped protrusion. The first linear segment separates the first block-shaped protrusion and the third block-shaped protrusion, and separates the second block-shaped protrusion and the third block-shaped protrusion. The shunt line groove is located at the connection between the first linear segment and the second linear segment, and is used to guide the flow of molten plastic in the first linear segment. One of the guide parts is connected to the second linear segment, and is used to guide the molten plastic to flow from the first linear segment into the second linear segment.

According to one or more embodiments of the present invention, in the above-mentioned injection molding mold, a first gap is provided between a guide portion and a first block-shaped protrusion for allowing molten plastic to pass through, and a second gap is provided between a guide portion and a second block-shaped protrusion for allowing molten plastic to pass through.

According to one or more embodiments of the present invention, in the above-mentioned injection molding mold, each guide portion includes an arc-shaped slope and a continuous wall. The arc-shaped slope is used to increase the flow rate of the molten plastic flowing from the first linear segment to the second linear segment. The continuous wall connects the two opposite ends of the arc-shaped slope and the diversion line groove, and the long axis direction of the continuous wall is parallel to the long axis direction of the mold body, and the continuous wall is used to guide the flow direction of the molten plastic in the first linear segment.

According to one or more embodiments of the present invention, in the above-mentioned injection molding die, the grid groove further includes a slope portion. The slope portion is located on the second linear segment, and two opposite ends of the slope portion respectively have a higher point and a lower point, and the higher point is located between the lower point and the bulge.

According to one or more embodiments of the present invention, in the above-mentioned injection molding mold, the first guide portion further includes a first axial hole, the first axial hole is recessed in the groove bottom of the diverter groove and connected to the diverter groove. The long axis direction of the first axial hole is parallel to the mold closing direction and is orthogonal to the long axis direction of the mold body.

According to one or more embodiments of the present invention, in the injection molding die, the raised portion is a cone. An arc slope of the cone faces the second linear segment of the grid groove to increase the flow rate of the molten plastic in the grid groove. The thickness of the cone is less than the thickness of one of the block-shaped protrusions.

According to one or more embodiments of the present invention, in the above-mentioned injection molding mold, three of these block-shaped protrusions that are not on the same straight line share a first center position, and the first guide portion is arranged at the first center position.

According to one or more embodiments of the present invention, the injection molding mold further includes at least one second air guide. The second air guide includes a cross-shaped groove and a second axial hole. The cross-shaped groove is recessed in the grid groove. The second axial hole is recessed in the groove bottom of the cross-shaped groove and connected to the cross-shaped groove. The long axis direction of the second axial hole is parallel to the mold closing direction and is orthogonal to the long axis direction of the mold body. The other three of these block-shaped protrusions that are not on the same straight line share a second center position, and the second air guide is set at the second center position, which is different from the first center position.

According to one or more embodiments of the present invention, in the above-mentioned injection molding mold, the mother mold covers these block-shaped protrusions, and the molten plastic in the injection cavity is cooled and formed into a frame housing.

Thus, through the above structure, the injection molding mold of the present invention can solve the problem that the keyboard frame produced by the prior art is easy to form a concave mark, so there is no need to deliberately increase the molding injection speed and pressure, thereby reducing the probability of shortening the mold life and increasing the mold maintenance cost.

The above description is only used to explain the problem to be solved by the present invention, the technical means for solving the problem, and the effects produced, etc. The specific details of the present invention will be introduced in detail in the following implementation method and related drawings.

The following will disclose multiple embodiments of the present invention with drawings. For the purpose of clarity, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. In other words, in an embodiment of the present invention, these practical details are not necessary. In addition, for the purpose of simplifying the drawings, some commonly used structures and components will be depicted in the drawings in a simple schematic manner.

FIG. 1 is a three-dimensional view of an injection molding mold 10 in an open mold state of an embodiment of the present invention. FIG. 2 is a cross-sectional schematic view of the injection molding mold 10 in FIG. 1 in a closed mold state. FIG. 3 is a frame housing 500 produced by the injection molding mold 10 in FIG. 1. As shown in FIG. 1 and FIG. 2, the injection molding mold 10 includes a male mold 100 and a female mold 200. The male mold 100 includes a mold core body 110, a grid groove 120 and a plurality of block-shaped protrusions 160. The grid groove 120 is formed on the top surface 111 of the mold core body 110, and surrounds and defines these block-shaped protrusions 160. The female mold 200 can be closed to cover the top surface 111 of the male mold 100.

When the female mold 200 is molded with the male mold 100 along a mold-closing direction (such as the Z axis) so that the female mold 200 directly covers the top surface 111 of the male mold 100 and the block-shaped protrusions 160, an injection cavity 220 can be formed between the female mold 200 and the male mold 100. The injection cavity 220 at least includes the grid groove 120 in a closed state.

Therefore, when the molten plastic (not shown) is injected into the injection cavity 220 through the plastic inlet 210 of the mother mold 200, the molten plastic will gradually fill the grid grooves 120. When the molten plastic is cooled and formed, a grid housing 500 (FIG. 3) having a plurality of grid openings 510 can be manufactured. For example, the grid housing 500 is a C-piece or keyboard grid of a laptop computer, however, the present invention is not limited thereto.

FIG. 4 is a partial enlarged view of the area M1 of FIG. 1. FIG. 5 is a cross-sectional view made along line segment AA of FIG. 4. FIG. 6 is a cross-sectional view made along line segment BB of FIG. 4. More specifically, as shown in FIG. 4 to FIG. 6, the injection molding mold 10 further includes a plurality of first guide portions 300. These first guide portions 300 are distributed in the grid groove 120. For example, each first guide portion 300 is disposed at a central position between three of the block-shaped protrusions 160 (e.g., hereinafter referred to as the first block-shaped protrusion 160A, the second block-shaped protrusion 160B, and the third block-shaped protrusion 160C) in the grid groove 120, wherein the three block-shaped protrusions (160A, 160B, 160C) are arranged in a triangle and the three are not on the same straight line. In other words, the first block-shaped protrusion 160A and the second block-shaped protrusion 160B are arranged in sequence along the long axis direction (such as the X axis) of the mold body 110, and the third block-shaped protrusion 160C is arranged side by side on the same side of the first block-shaped protrusion 160A and the second block-shaped protrusion 160B.

More specifically, each first guide portion 300 includes a shunt groove 310 and a raised portion 320. The raised portion 320 is located in the grid groove 120 and extends from the bottom surface 121 of the grid groove 120 toward the direction of the mother mold (such as the Z axis). The shunt groove 310 is in a straight line shape and is provided on the raised portion 320 and the grid groove 120. More specifically, the shunt groove 310 directly divides the raised portion 320 into two guide portions 330, and the long axis direction of the shunt groove 310 (such as the X axis) is parallel to the long axis direction of the mold body 110 (such as the X axis, FIG. 1).

Furthermore, a portion of the grid groove 120 is a T-shaped pattern. The T-shaped pattern includes a first linear segment 130 (such as a longitudinal segment of the grid groove 120) and a second linear segment 140 (such as a transverse segment of the grid groove 120) connected to each other. The long axis direction (such as the X axis) of the first linear segment 130 is parallel to the long axis direction (such as the X axis) of the mold body 110, and is orthogonal to the long axis direction (such as the Y axis) of the second linear segment 140. The second linear segment 140 completely separates the first block-shaped protrusion 160A and the second block-shaped protrusion 160B. The first linear segment 130 completely separates the first block-shaped protrusion 160A and the third block-shaped protrusion 160C, and completely separates the second block-shaped protrusion 160B and the third block-shaped protrusion 160C. The shunt groove 310 of the first guide portion 300 is located at the connection between the first linear segment 130 and the second linear segment 140, and one of the guide portions 330 is connected to the second linear segment 140, and has a first gap 141 for molten plastic to pass through between the first block-shaped protrusion 160A, and has a second gap 142 for molten plastic to pass through between the second block-shaped protrusion 160B.

Thus, when the molten plastic passes through the first guide portion 300 in the grid groove 120, the ridge 320 acts as a pressurizing point in the grid groove 120, so that the molten plastic injected during molding is accelerated through the pressurizing point, and the diversion line groove 310 can guide a portion of the molten plastic to continue to flow in the first linear segment 130, and the guide portion 330 can guide the other portion of the molten plastic to flow from the first linear segment 130 into the second linear segment 140. Therefore, since the injection molding mold 10 of this embodiment can allow the molten plastic to flow in the longitudinal segment of the grid groove 120 and also to the transverse segment, the problem of the keyboard frame made by the prior art being easily formed with a concave mark is solved.

In addition, the grid groove 120 further includes a slope portion 150, and the slope portion 150 is disposed in the second linear segment 140. Two opposite ends of the slope portion 150 respectively have a higher point 151 and a lower point 152, and the higher point 151 is located between the lower point 152 and the protrusion 320. In this way, when the molten plastic in the second linear segment 140 moves from the higher point 151 to the lower point 152, the slope portion 150 can increase the flow rate of the molten plastic in the second linear segment 140.

Furthermore, as shown in FIG. 4 , each guide portion 330 includes an arc-shaped slope 331 (FIG. 4 and FIG. 5 ) and a continuous wall 332 (FIG. 4 and FIG. 6 ). The arc-shaped slope 331 can increase the flow rate of the molten plastic from the first linear segment 130 to the second linear segment 140 . The continuous wall 332 directly connects the arc-shaped slope 331 and two opposite ends of the manifold 310 , and the long axis direction of the continuous wall 332 is parallel to the long axis direction (such as the X axis) of the mold body 110 , and the continuous wall 332 can guide the flow direction of the molten plastic in the first linear segment 130 .

As shown in FIG. 5 , for example, the cross section of the raised portion 320 is a cone, and the arc slope 331 of the cone faces the second linear segment 140 of the grid groove 120 to increase the flow rate of the molten plastic in the grid groove 120. The thickness of the cone (i.e., the vertical height H1) is less than the thickness of one of the block-shaped protrusions 160 (i.e., the vertical height H2). However, the present invention is not limited thereto.

As shown in FIG. 4 and FIG. 5 , the first air guide portion 300 further includes a first axial hole 340. The first axial hole 340 is a blind hole, which is recessed in the groove bottom 311 of the manifold groove 310 and is connected to the manifold groove 310. The long axis direction (such as the Z axis) of the first axial hole 340 is parallel to the mold clamping direction (such as the Z axis) and is orthogonal to the long axis direction (such as the X axis, FIG. 1 ) of the mold body 110. Therefore, when the molten plastic fills the grid groove 120, the molten plastic can become the supporting rib 520 (FIG. 3) of the frame housing 500 after cooling and forming in the first axial hole 340.

FIG. 7 is a partial enlarged view of the area M2 of FIG. 1. As shown in FIG. 1 and FIG. 7, the injection molding mold 10 further includes a plurality of second guide portions 400. These second guide portions 400 are distributed in the grid groove 120. For example, as shown in FIG. 7, each second guide portion 400 is disposed in the grid groove 120 at a center position corresponding to three other block-shaped protrusions (such as the fourth block-shaped protrusion 160D, the fifth block-shaped protrusion 160E and the sixth block-shaped protrusion 160F) arranged in a triangle and not on the same straight line, and the second guide portion 400 and the first guide portion 300 are located at different positions.

More specifically, the second air guide portion 400 includes a cross-shaped groove 410 and a second axial hole 420. The cross-shaped groove 410 is recessed in the bottom surface 121 of the grid groove 120. The second axial hole 420 is a blind hole, recessed in the groove bottom 411 of the cross-shaped groove 410 and connected to the cross-shaped groove 410, and the long axis direction of the second axial hole 420 is parallel to the mold closing direction (such as the Z axis, refer to FIG. 5), and is orthogonal to the long axis direction of the mold body 110 (such as the X axis, FIG. 1).

Therefore, when the molten plastic fills the grid groove 120, the molten plastic is cooled and formed in the second axial hole 420 to become the supporting rib 520 of the frame housing 500 (FIG. 3).

Thus, through the above structure, the injection molding mold of the embodiment of the present invention can solve the problem that the keyboard frame produced by the prior art is easy to form a concave mark, so there is no need to deliberately increase the molding injection speed and pressure, thereby reducing the probability of shortening the mold life and increasing the mold maintenance cost.

Finally, the above disclosed embodiments are not intended to limit the present invention. Anyone skilled in the art can make various changes and modifications within the spirit and scope of the present invention, and all of them can be protected by the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.

10: Injection molding die 100: Male mold 110: Mold body 111: Top surface 120: Grid groove 121: Bottom surface 130: First linear segment 140: Second linear segment 141: First gap 142: Second gap 150: Slope 151: Higher point 152: Lower point 160: Block convex part 160A: First block convex part 160B: Second block convex part 160C: Third block convex part 160D: Fourth block convex part 160E: Fifth block convex part 160F: Sixth block convex part 200: Female mold 210: Glue inlet 220: injection cavity 300: first guide part 310: shunt line groove 311: groove bottom 320: raised part 330: guide part 331: arc slope 332: continuous wall 340: first axial hole 400: second guide part 410: cross groove 411: groove bottom 420: second axial hole 500: frame housing 510: frame opening 520: support rib AA, BB: line segment H1, H2: vertical height M1, M2: area X, Y, Z: axis

In order to make the above and other purposes, features, advantages and embodiments of the present invention more clearly understandable, the attached drawings are described as follows: FIG. 1 is a three-dimensional diagram of an injection molding mold of an embodiment of the present invention in an open mold state. FIG. 2 is a cross-sectional schematic diagram of the injection molding mold of FIG. 1 in a closed mold state. FIG. 3 is a frame housing made by the injection molding mold of FIG. 1. FIG. 4 is a partial enlarged view of area M1 of FIG. 1. FIG. 5 is a cross-sectional view made along line segment AA of FIG. 4. FIG. 6 is a cross-sectional view made along line segment BB of FIG. 4. FIG. 7 is a partial enlarged view of area M2 of FIG. 1.

Domestic storage information (please note in the order of storage institution, date, and number) None Foreign storage information (please note in the order of storage country, institution, date, and number) None

120: Grid groove

121: Bottom

130: First linear segment

140: Second linear segment

141: The first gap

142: The second gap

150: Slope

160A: First block-shaped protrusion

160B: Second block-shaped protrusion

160C: The third block-shaped protrusion

300: First guide part

310: Shunt duct

320: bulge

330: Guidance Department

340: First shaft hole

AA,BB: line segment

M1: Region

X,Y,Z: axis

Claims (10)

An injection molding mold comprises: a male mold comprising a mold body, a grid groove and a plurality of block-shaped protrusions, wherein the grid groove is concavely arranged on one surface of the mold body and surrounds and defines the block-shaped protrusions; a female mold, which is used to form an injection cavity including the grid groove after being molded with the male mold along a mold-closing direction, wherein the injection cavity is used to inject a molten plastic; and at least one first guide portion, comprising a ridge and a diverter groove, wherein the ridge is located in the grid groove and extends toward the direction of the female mold, and the diverter groove is located on the ridge and the grid groove, and separates the ridge into two guide portions, wherein the long axis direction of the diverter groove is parallel to the long axis direction of the mold body. The injection molding mold as described in claim 1, wherein the block-shaped protrusions include a first block-shaped protrusion, a second block-shaped protrusion and a third block-shaped protrusion, the first block-shaped protrusion and the second block-shaped protrusion are arranged in sequence along the long axis direction of the mold body; and the grid-shaped groove includes a first linear segment and a second linear segment connected to each other, the long axis direction of the first linear segment is parallel to the long axis direction of the mold body and is orthogonal to the long axis direction of the second linear segment, the second linear segment separates the first block-shaped protrusion and the second block-shaped protrusion, the first linear segment separates the first block-shaped protrusion and the third block-shaped protrusion, and separates the second block-shaped protrusion and the third block-shaped protrusion, The shunt line groove is located at the connection between the first linear segment and the second linear segment to guide the flow of the molten plastic in the first linear segment, and one of the guide parts is connected to the second linear segment to guide the molten plastic to flow from the first linear segment to the second linear segment. An injection molding mold as described in claim 2, wherein one of the guide portions has a first gap with the first block-shaped protrusion for allowing the molten plastic to pass through, and has a second gap with the second block-shaped protrusion for allowing the molten plastic to pass through. The injection molding mold as described in claim 2, wherein each of the guide portions comprises: an arc-shaped slope surface for increasing the flow rate of the molten plastic from the first linear segment into the second linear segment; and a continuous wall surface connecting the arc-shaped slope surface and two opposite ends of the diversion line groove, and the long axis direction of the continuous wall surface is parallel to the long axis direction of the mold body, and the continuous wall surface is used to guide the flow direction of the molten plastic in the first linear segment. An injection molding mold as described in claim 2, wherein the grid groove further includes a slope portion, the slope portion is located on the second linear segment, the two opposite ends of the slope portion respectively have a higher point and a lower point, and the higher point is located between the lower point and the raised portion. The injection molding mold as described in claim 2, wherein the first guide portion further includes a first axial hole, the first axial hole is recessed in the bottom of the diverter groove and connected to the diverter groove, wherein the long axis direction of the first axial hole is parallel to the mold closing direction and is orthogonal to the long axis direction of the mold body. The injection molding mold as described in claim 2, wherein the raised portion is a cone, an arc-shaped slope of the cone faces the second linear segment of the grid groove, for increasing the flow rate of the molten plastic in the grid groove, wherein the thickness of the cone is less than the thickness of one of the block-shaped protrusions. In the injection molding mold as described in claim 1, three of the block-shaped protrusions that are not on the same straight line share a first center position, and the first guide portion is arranged at the first center position. The injection molding mold as described in claim 8 further comprises: At least one second guide portion, comprising a cross-shaped groove and a second axial hole, the cross-shaped groove is recessed in the grid groove, the second axial hole is recessed in the groove bottom of the cross-shaped groove and connected to the cross-shaped groove, the long axis direction of the second axial hole is parallel to the mold closing direction and is orthogonal to the long axis direction of the mold core body, wherein the other three of the block-shaped protrusions that are not on the same straight line share a second center position, and the second guide portion is arranged at the second center position, which is located at a different position from the first center position. An injection molding mold as described in claim 1, wherein the mother mold covers the block-shaped protrusions, and the molten plastic in the injection cavity is cooled and formed into a frame casing.

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