US20060254042A1 - Mold-casting structure and improvement method for grounding of the same - Google Patents
Mold-casting structure and improvement method for grounding of the same Download PDFInfo
- Publication number
- US20060254042A1 US20060254042A1 US11/194,542 US19454205A US2006254042A1 US 20060254042 A1 US20060254042 A1 US 20060254042A1 US 19454205 A US19454205 A US 19454205A US 2006254042 A1 US2006254042 A1 US 2006254042A1
- Authority
- US
- United States
- Prior art keywords
- mold
- dishing
- micro
- protrusions
- casting structure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/4998—Combined manufacture including applying or shaping of fluent material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49995—Shaping one-piece blank by removing material
Definitions
- the present invention is related to a mold-casting structure and the relevant electrical grounding method thereof.
- EMI Electromagnetic Interference
- the satellite television systems employ a dish antenna to collect satellite signals, and the signals are then reflected to low noise block down converters (LNB) equipped at the focus of the dish antenna for amplifying the signals and reducing its frequency down to around 1 GHz, i.e., the radio signals are transformed to an intermediate frequency.
- LNB low noise block down converters
- the adjusted signals are transmitted to an indoor television channel selector via a cable to select the signals of a desired channel, and the selected signals are then amplified, modulated, and then converted into video and audio signals for television viewing.
- LNB components essentially comprise a housing, horns, and a connector base. After an LNB is released from a mold, some dishings occur on the surface of the component due to the shrinkage of the material, e.g., aluminum alloy or plastic, while cooling.
- the material e.g., aluminum alloy or plastic
- FIG. 1 illustrates an LNB housing 11 with protrusions 12 on the bottom surface.
- dishings 13 occur at the opposite surface of the protrusions 12 .
- the grounding quality of a printed circuit board established inside the LNB housing 11 will become worse.
- the dishings cause errors of the dimensions to the original design, thus the effect of EMI prevention is inferior due to bad grounding quality. Consequently, the circuitry secured therein may need to be modulated, or have the dishings deposited with tin foil or filled in with conductive material to improve the grounding quality. As a result, the time and cost of the process will increase and the reliability will be difficult to control.
- the dishings on the mold-casting structure occurring after mold-release can be repaired to increase the grounding efficiency, the EMI will be diminished effectively, and thus the signals will be transmitted with high quality.
- the objective of the present invention is to provide a mold-casting structure with high grounding efficiency, which can resolve the problem of inferior electrical conduction due to dishings occurring on the mold-casting structure after the mold-casting structure was released from the mold, and so as to avoid EMI effectively.
- the present invention discloses a mold-casting structure.
- the mold-casting structure comprises at least one dishing and a plurality of micro-protrusions.
- the at least one dishing formed on the surface of a mold-casting body, the plurality of micro-protrusions sticking out of the surface of the dishing, and the tops of the micro-protrusions constitute a plane, so that the grounding issue of a circuitry designed in the mold-casting structure caused by the dishing can be resolved.
- the dishing can be verified by spraying paint and scraping the paint with a scraper along a plane afterwards, the locations that the paint remains are verified as dishings.
- a three-dimensional measurement instrument can also be used for more precisely measuring the contours and dimensions of the dishing.
- the micro-protrusions can be formed on the dishing by mechanical processing or electric discharge machining (EDM). Furthermore, a concave-convex structure matching the micro-protrusions can be formed on the mold. Accordingly, the micro-protrusions can be fabricated by casting directly, and therefore it is more suitable for mass production.
- EDM electric discharge machining
- FIG. 1 illustrates dishings on an LNB housing
- FIGS. 2 through 4 illustrate an LNB mold-casting structure and the relevant grounding improvement method in accordance with the present invention.
- an LNB structure 20 for microwave telecommunication comprises a housing 22 , two horns 24 , and two connector bases 26 , where the housing 22 , with the locations corresponding to the horns 24 , is provided with two through holes shaped like semi-circles for the connection of signal cables to the horns 24 . Only one horn 24 can be seen in FIG. 2 , the other one is behind the housing 22 and thus not shown.
- FIG. 3 illustrates the bottom view of the housing 22 .
- a painting material such as a traditional paint, an ink marker or a red lead paint is daubed on the bottom surface 22 a of the housing 22 , and then scraped by a tool such as a scraper along a plane that is substantially equivalent to the bottom surface 22 a but without protrusions or dishings. Accordingly, the paint on the protruded portions will be removed, so that the locations with remaining paint can be deemed dishings 30 .
- the dishings 30 are closed to the through holes 28 , i.e., the dishings 30 are closed to the opposite side of the horns 24 , the phenomenon reflects material shrinkage.
- a three-dimensional measurement instrument can also be used to more precisely measure the dishings 30 , so as to obtain data such as the depths and contours of the dishings 30 .
- a plurality of micro-protrusions 32 are formed on the dishings 30 on the bottom surface 22 a by various mechanical processes (for example, pin hammer) or electric discharge machining.
- the tops of the micro-protrusions 32 can essentially constitute a plane, so as to resolve the grounding problem.
- a convex-concave structure 42 matching the micro-protrusions 32 can be formed on a mold 40 for manufacturing the LNB structure 20 , so that the micro-protrusions 32 are formed naturally after the LNB structure 20 is released from the mold 40 .
- the micro-protrusions 32 make up the dishings 30 , so that the inferior grounding issue due to inferior electrical conduction will be resolved.
- the LNB structure 20 can be made of aluminum alloy or plastic.
- the diameter of a micro-protrusion 32 is between 0.01 and 5 mm, and the height thereof depends on the depth of the dishing 30 .
- the distance between neighboring micro-protrusions 32 is between 0.01 and 0.5 mm.
Abstract
A mold-casting structure comprises at least one dishing and a plurality of micro-protrusions. The dishing(s) formed on the surface of a mold-casting body, the plurality of micro-protrusions sticking out of the surface of the dishing, and the tops of the micro-protrusions constitute on a plane, so that the grounding issue of the circuitry embedded in the mold-casting structure caused by the dishing can be resolved. The dishing can be verified by daubing paint and scrapping thereafter, the location of remaining paint is deemed the dishing. Moreover, a three-dimensional measurement instrument can be employed for more precise measurement. The micro-protrusions can be formed on the dishing by mechanical processing or electric discharge machining (EDM). Alternatively, a mold with a structure matching the micro-protrusions can be formed first, and consequently the micro-protrusions are formed directly by mold-filling, which is more suitable for mass production.
Description
- (A) Field of the Invention The present invention is related to a mold-casting structure and the relevant electrical grounding method thereof. In view of the superior grounding efficiency of the mold-casting structure of the present invention, EMI (Electromagnetic Interference) can be prevented effectively.
- (B) Description of Related Art
- The satellite television systems employ a dish antenna to collect satellite signals, and the signals are then reflected to low noise block down converters (LNB) equipped at the focus of the dish antenna for amplifying the signals and reducing its frequency down to around 1 GHz, i.e., the radio signals are transformed to an intermediate frequency. The adjusted signals are transmitted to an indoor television channel selector via a cable to select the signals of a desired channel, and the selected signals are then amplified, modulated, and then converted into video and audio signals for television viewing.
- Noise minimization is crucial to maintaining the quality of microwave telecommunication. LNB components essentially comprise a housing, horns, and a connector base. After an LNB is released from a mold, some dishings occur on the surface of the component due to the shrinkage of the material, e.g., aluminum alloy or plastic, while cooling.
- These dishings often occur at the positions having protrusions in the opposite side, e.g., a rib for heat dissipation or a thick portion.
FIG. 1 illustrates an LNBhousing 11 withprotrusions 12 on the bottom surface. When the LNB is released from a mold,dishings 13 occur at the opposite surface of theprotrusions 12. As a result, the grounding quality of a printed circuit board established inside the LNBhousing 11 will become worse. - The dishings cause errors of the dimensions to the original design, thus the effect of EMI prevention is inferior due to bad grounding quality. Consequently, the circuitry secured therein may need to be modulated, or have the dishings deposited with tin foil or filled in with conductive material to improve the grounding quality. As a result, the time and cost of the process will increase and the reliability will be difficult to control.
- Therefore, if the dishings on the mold-casting structure occurring after mold-release can be repaired to increase the grounding efficiency, the EMI will be diminished effectively, and thus the signals will be transmitted with high quality.
- The objective of the present invention is to provide a mold-casting structure with high grounding efficiency, which can resolve the problem of inferior electrical conduction due to dishings occurring on the mold-casting structure after the mold-casting structure was released from the mold, and so as to avoid EMI effectively.
- To achieve the above objective, the present invention discloses a mold-casting structure. The mold-casting structure comprises at least one dishing and a plurality of micro-protrusions. The at least one dishing formed on the surface of a mold-casting body, the plurality of micro-protrusions sticking out of the surface of the dishing, and the tops of the micro-protrusions constitute a plane, so that the grounding issue of a circuitry designed in the mold-casting structure caused by the dishing can be resolved.
- The dishing can be verified by spraying paint and scraping the paint with a scraper along a plane afterwards, the locations that the paint remains are verified as dishings. In addition, a three-dimensional measurement instrument can also be used for more precisely measuring the contours and dimensions of the dishing.
- The micro-protrusions can be formed on the dishing by mechanical processing or electric discharge machining (EDM). Furthermore, a concave-convex structure matching the micro-protrusions can be formed on the mold. Accordingly, the micro-protrusions can be fabricated by casting directly, and therefore it is more suitable for mass production.
-
FIG. 1 illustrates dishings on an LNB housing; and -
FIGS. 2 through 4 illustrate an LNB mold-casting structure and the relevant grounding improvement method in accordance with the present invention. - As shown in
FIG. 2 , anLNB structure 20 for microwave telecommunication comprises ahousing 22, twohorns 24, and twoconnector bases 26, where thehousing 22, with the locations corresponding to thehorns 24, is provided with two through holes shaped like semi-circles for the connection of signal cables to thehorns 24. Only onehorn 24 can be seen inFIG. 2 , the other one is behind thehousing 22 and thus not shown. -
FIG. 3 illustrates the bottom view of thehousing 22. After the LNBstructure 20 is released from a mold and cooled down, a painting material such as a traditional paint, an ink marker or a red lead paint is daubed on thebottom surface 22 a of thehousing 22, and then scraped by a tool such as a scraper along a plane that is substantially equivalent to thebottom surface 22 a but without protrusions or dishings. Accordingly, the paint on the protruded portions will be removed, so that the locations with remaining paint can be deemed dishings 30. In this embodiment, thedishings 30 are closed to the throughholes 28, i.e., thedishings 30 are closed to the opposite side of thehorns 24, the phenomenon reflects material shrinkage. - After the locations of
dishings 30 are verified, a three-dimensional measurement instrument can also be used to more precisely measure thedishings 30, so as to obtain data such as the depths and contours of thedishings 30. Then, a plurality of micro-protrusions 32 are formed on thedishings 30 on thebottom surface 22 a by various mechanical processes (for example, pin hammer) or electric discharge machining. The tops of the micro-protrusions 32 can essentially constitute a plane, so as to resolve the grounding problem. - As shown in
FIG. 4 , a convex-concave structure 42 matching the micro-protrusions 32 can be formed on amold 40 for manufacturing theLNB structure 20, so that the micro-protrusions 32 are formed naturally after theLNB structure 20 is released from themold 40. The micro-protrusions 32 make up thedishings 30, so that the inferior grounding issue due to inferior electrical conduction will be resolved. - In this embodiment, the LNB
structure 20 can be made of aluminum alloy or plastic. The diameter of a micro-protrusion 32 is between 0.01 and 5 mm, and the height thereof depends on the depth of thedishing 30. The distance between neighboring micro-protrusions 32 is between 0.01 and 0.5 mm. - The above-described embodiments of the present invention are intended to be illustrative only. Numerous alternative embodiments may be devised by those skilled in the art without departing from the scope of the following claims.
Claims (12)
1. A mold-casting structure, comprising:
at least one dishing formed on a surface of a mold-casting body; and
a plurality of micro-protrusions formed on the dishing, and the tops of the plurality of micro-protrusions constitute a plane;
whereby the inferior grounding of the circuitry secured on the mold-casting structure due to the dishing can be avoided.
2. The mold-casting structure of claim 1 , which is made of aluminum alloy or plastic.
3. The mold-casting structure of claim 1 , wherein the distance between neighboring micro-protrusions is between 0.01 and 5 mm.
4. The mold-casting structure of claim 1 , wherein the diameter of the micro-protrusion is between 0.01 and 5 mm.
5. The mold-casting structure of claim 1 , which is applied to a microwave telecommunication apparatus.
6. The mold-casting structure of claim 1 , which is applied to a low noise block down converter (LNB).
7. An improved method for grounding of a mold-casting structure, comprising:
verifying a location of at least one dishing on the mold-casting structure; and
forming micro-protrusions on the at least one dishing.
8. The mold-casting structure of claim 7 , wherein the dishing is verified by a three-dimensional measurement instrument.
9. The mold-casting structure of claim 7 , wherein the verification for the location of the dishing comprises the steps of:
daubing paint on a surface of the mold-casting structure; and
scraping the surface along a plane, and the location of the remaining paint being deemed the dishing.
10. The mold-casting structure of claim 7 , wherein the micro-protrusions are formed on the surface of the dishing by mechanical processing or electric discharge machining.
11. The mold-casting structure of claim 7 , wherein the micro-protrusions are formed on the surface of the dishing by a pin hammer.
12. The mold-casting structure of claim 7 , wherein the micro-protrusions are molded by a mold with a concave-convex structure matching the micro-protrusions.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW094109973A TW200635474A (en) | 2005-03-30 | 2005-03-30 | Mold-casting structure and the grounding improvement method thereof |
TW094109973 | 2005-03-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060254042A1 true US20060254042A1 (en) | 2006-11-16 |
Family
ID=37417652
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/194,542 Abandoned US20060254042A1 (en) | 2005-03-30 | 2005-08-02 | Mold-casting structure and improvement method for grounding of the same |
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US (1) | US20060254042A1 (en) |
TW (1) | TW200635474A (en) |
Cited By (21)
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US8724302B2 (en) | 2012-03-02 | 2014-05-13 | Microsoft Corporation | Flexible hinge support layer |
US8733423B1 (en) * | 2012-10-17 | 2014-05-27 | Microsoft Corporation | Metal alloy injection molding protrusions |
US20140158317A1 (en) * | 2012-10-17 | 2014-06-12 | Microsoft Corporation | Metal Alloy Injection Molding |
US8850241B2 (en) | 2012-03-02 | 2014-09-30 | Microsoft Corporation | Multi-stage power adapter configured to provide low power upon initial connection of the power adapter to the host device and high power thereafter upon notification from the host device to the power adapter |
US8873227B2 (en) | 2012-03-02 | 2014-10-28 | Microsoft Corporation | Flexible hinge support layer |
US9027631B2 (en) | 2012-10-17 | 2015-05-12 | Microsoft Technology Licensing, Llc | Metal alloy injection molding overflows |
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- 2005-08-02 US US11/194,542 patent/US20060254042A1/en not_active Abandoned
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Legal Events
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AS | Assignment |
Owner name: MICROELECTRONICS TECHNOLOGY INC., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHOU, WEN PIN;YANG, LAN CHUN;REEL/FRAME:016833/0371 Effective date: 20050623 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |