WO2014056180A1 - Appareil et méthode de refroidissement de perceuses pour cartes de circuit imprimé - Google Patents

Appareil et méthode de refroidissement de perceuses pour cartes de circuit imprimé Download PDF

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Publication number
WO2014056180A1
WO2014056180A1 PCT/CN2012/082832 CN2012082832W WO2014056180A1 WO 2014056180 A1 WO2014056180 A1 WO 2014056180A1 CN 2012082832 W CN2012082832 W CN 2012082832W WO 2014056180 A1 WO2014056180 A1 WO 2014056180A1
Authority
WO
WIPO (PCT)
Prior art keywords
chamber
drill bit
cooling substance
cooling
housing
Prior art date
Application number
PCT/CN2012/082832
Other languages
English (en)
Inventor
Edward Feng
Original Assignee
Linde Aktiengesellschaft
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Linde Aktiengesellschaft filed Critical Linde Aktiengesellschaft
Priority to PCT/CN2012/082832 priority Critical patent/WO2014056180A1/fr
Priority to CN201280075660.5A priority patent/CN104781038A/zh
Priority to TW102125286A priority patent/TW201414555A/zh
Publication of WO2014056180A1 publication Critical patent/WO2014056180A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/0042—Devices for removing chips
    • B23Q11/005—Devices for removing chips by blowing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/10—Arrangements for cooling or lubricating tools or work
    • B23Q11/1038—Arrangements for cooling or lubricating tools or work using cutting liquids with special characteristics, e.g. flow rate, quality
    • B23Q11/1061—Arrangements for cooling or lubricating tools or work using cutting liquids with special characteristics, e.g. flow rate, quality using cutting liquids with specially selected composition or state of aggregation

Definitions

  • the present embodiments relate to apparatus used to drill holes in printed circuit boards.
  • PCBs printed circuit board
  • manufacturers of PCBs are required to drill a myriad of holes in each board.
  • the holes are then copper plated at an interior thereof, and the copper functions as connectors between the plurality of layers of the board.
  • the resin layers of the PCB are heated and can be "smeared” over the copper layers in the holes, thereby preventing electrical contact among the layers after the copper plating.
  • the resulting "smear" in the holes must therefore be removed before the plating process. This results in additional, unwanted processing time of the PCBs.
  • Heat is generated during the cutting and grinding process which occurs during PCB drilling.
  • the temperature from the drilling can be as high as 300° Celsius.
  • the smear that is produced from the drilling at all sides of the hole is caused by the hot drill bit melting the epoxy of the resin layers in the PCB material.
  • the drill bit begins to wear out from repeated use and the worn bits have a tendency to worsen the smearing that occurs.
  • One way to reduce the smearing is to correspondingly reduce the speed of the drill, but this reduces the efficiency and the effectiveness of the drilling and the assembly line process for the PCBs. economiess of scale dictate that drilling faster is more economical, even if it is required to remove the smear thereafter.
  • FIG. 1 shows an apparatus embodiment of the invention for cooling a drill bit
  • FIG. 2 shows a nozzle for the apparatus embodiment of FIG. 1.
  • FIG. 1 The apparatus embodiment shown in FIG. 1 is shown generally at 10 and is used in association with a drill for which a spindle 12 is shown.
  • a drill bit 14 used to drill holes in for example printed circuit boards (PCB) 16. It is understood that the drill bit 14 can be used to drill holes in other objects and articles of manufacture.
  • PCB printed circuit boards
  • the apparatus 10 includes a pressure cover 18 or housing having a side wall 20 defining an open ended chamber 22 or space.
  • the spindle 12 can be connected to the pressure cover 18 by mechanical fasteners such as screws for example.
  • the pressure cover 18 may be manufactured from metal or plastic.
  • the chamber 22 is open ended at two sides as shown in FIG. 1 , and is sized and shaped to receive the spindle 12 and the drill bit 14. As shown in FIG. 1 , the chamber 22 is constructed with a step 23 having a diameter less than that of the chamber to receive the spindle 12 to a certain depth within the chamber, the depth being commensurate with the portion of the drill bit 14 that will drill through and penetrate the PCB 16.
  • the chamber 22 and a lower portion 24 of the cover 18 coact to restrict the downward movement of the spindle 12 in the open ended chamber 22.
  • a lower portion 25 of the chamber 22 is sized and shaped to receive the drill bit 14 and to be positioned in registration with an area of the PCB 16 that is to be drilled.
  • a spacer member 26 or insert is disposed adjacent the housing and, as shown, between a bottom surface 28 of the side wall 20 and an upper surface 30 of the PCB 16.
  • the spacer 26 may be formed as part of the pressure cover 18.
  • the spacer 26 supports a head of the drill as the bit 14 drills through the PCB 16.
  • the spacer can form a hermetic seal so that the chamber 22 is sealed off from the atmosphere external to the pressure cover and the PCB.
  • the spacer 26 may be manufactured from metal or plastic, but usually from a material harder than the material from which the cover 18 is manufactured.
  • the pressure cover 18 includes ports or passages in the side wall 20.
  • a first port 32 or passage in the side wall 20 is for introducing a cooling substance into the open ended chamber 22.
  • a second port 34 or passage is for exhausting or venting the atmosphere and any particular matter from the chamber 22 through for example an exhaust hose 36.
  • a gas pipe 38 may be extended through the first port and include an end portion 40 terminating in the chamber 22 proximate the drill bit 14.
  • Carbon dioxide (C0 2 ) 42 can be introduced from a remote source (not shown) through a pipe 44 which is connected to the gas pipe 38.
  • a valve 46, flow meter 48 and a pressure meter 50 for the gas are in fluid communication with the pipe 44.
  • the valve 46 is disposed upstream of the flow meter 48, and the flow meter is disposed upstream of the pressure meter 50, all of which are disposed upstream of the pipe 38.
  • the C0 2 42 is provided as liquid C0 2 so that it changes phase to gas and solid (dry ice) during its passage through the gas pipe 38 to be injected from the end portion 40 of the pipe.
  • the C0 2 can be jetted or pulsed as a spray 45 into the chamber 22.
  • the end portion may include a nozzle.
  • the C0 2 gas cools the drill bit 14.
  • the spindle 12 rotates at a very high velocity in order to propel the drill bit 14 through the PCB 16. The cooling occurs during the period of time when the drill bit 14 is withdrawn or retracted from a hole it has just drilled in the PCB 16.
  • a temperature in the chamber 22 is from -10°C to 5°C due to use of the C0 2 .
  • the liquid carbon dioxide can be pulsed if necessary and the jet of coolant C0 2 aimed directly at the drill bit.
  • the drill bit is cooled when it is withdrawn so that it is at a reduced temperature for the next drilling operation, thereby preventing frictional heat from building up to melt the epoxy of the resin board.
  • the pulsing of the C0 2 to contact the drill bit 14 can occur as soon as the drill bit is withdrawn from the hole and until such time just before the drill bit commences drilling the next hole in the PCB 16.
  • a pump 43 for the liquid C0 2 is used.
  • the pump 43 is in fluid
  • the pump 43 can be timed to provide pulsed bursts of the C0 2 to the chamber 22, or the pump can be controlled by a signal transmitted from the drill 12. That is, when the bit 14 is being retracted from the PCB 16 the drill can transmit or trigger a signal to the pump 43 to provide the C0 2 to the chamber 22.
  • the C0 2 injection cycle can also begin with a pulse of liquid C0 2 commencing when the drill bit 14 contacts the PCB 16 and is stopped when the drill bit is withdrawn from the PCB.
  • the spray 45 can be continuously provided as a spray, pulsed stream or jet, to the chamber 22.
  • the drilling of the PCB 16 will usually prevent the C0 2 from entering the drilled hole to cool the bit 14, until such time as the bit is withdrawn from the hole. Therefore, providing the C0 2 to the chamber 22 may be done only when the bit 14 is not actually drilling the PCB 16 in order to conserve the C0 2 . That is, providing the C0 2 to the chamber 22 during the drilling is not detrimental to the drilling procedure or the PCB 16; but it will result in using more C0 2 .
  • nozzle 52 another type of nozzle 52 is shown to be mounted to the end portion 40 of the pipe 38.
  • gas or liquid C0 2 54 is introduced into an inner tube 56, while nitrogen gas 58 (for example at 3 bar) is introduced into a pipe branch 60 which is in communication with an outer tube 62 or pipe for the nitrogen.
  • the inner tube 56 is disposed within the outer tube 62.
  • the C0 2 54 and nitrogen 58 flow along the nozzle 52 such that the nitrogen is external to and in certain
  • the applications shrouds the carbon dioxide 54 when the gases exit the nozzle to be provided to the drill bit 14.
  • the nitrogen will reduce the moisture condensation at the drill bit 14 and on the PCB 16.
  • the inner tube 56 and outer tube may be coaxial.
  • the pipe 38, the nozzle 40 and the co-axial nozzle 52 can be
  • the present embodiments reduce the smears which occur with known drilling apparatus and eliminate the subsequent de-smearing process which is necessary for same.
  • the present embodiments also reduce wear of the drill bit 14 and prolong its working life.
  • the surface of the holes drilled in the PCB 16 are rendered more smooth and drilling speed is increased because overheating of the drill bit and smearing is substantially reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Drilling And Boring (AREA)

Abstract

L'invention concerne un appareil et une méthode de refroidissement d'un foret, l'appareil comprenant un logement (18) avec à l'intérieur une chambre à extrémités ouvertes (22) qui s'étend au travers du logement (18) pour recevoir un foret (14), un premier passage (32) permettant de fournir une substance de refroidissement (42) pour refroidir le foret (14), et une sortie en communication avec la chambre (22) et au travers de laquelle le foret (14) peut dépasser pour percer. L'appareil et la méthode peuvent éviter efficacement la déformation sans nuire à la vitesse du processus de perçage.
PCT/CN2012/082832 2012-10-12 2012-10-12 Appareil et méthode de refroidissement de perceuses pour cartes de circuit imprimé WO2014056180A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/CN2012/082832 WO2014056180A1 (fr) 2012-10-12 2012-10-12 Appareil et méthode de refroidissement de perceuses pour cartes de circuit imprimé
CN201280075660.5A CN104781038A (zh) 2012-10-12 2012-10-12 冷却用于印刷电路板的钻头
TW102125286A TW201414555A (zh) 2012-10-12 2013-07-15 用於印刷電路板之鑽頭之冷卻

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2012/082832 WO2014056180A1 (fr) 2012-10-12 2012-10-12 Appareil et méthode de refroidissement de perceuses pour cartes de circuit imprimé

Publications (1)

Publication Number Publication Date
WO2014056180A1 true WO2014056180A1 (fr) 2014-04-17

Family

ID=50476890

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2012/082832 WO2014056180A1 (fr) 2012-10-12 2012-10-12 Appareil et méthode de refroidissement de perceuses pour cartes de circuit imprimé

Country Status (3)

Country Link
CN (1) CN104781038A (fr)
TW (1) TW201414555A (fr)
WO (1) WO2014056180A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105171023A (zh) * 2014-06-06 2015-12-23 大族激光科技产业集团股份有限公司 微针治具的机械钻孔方法及其采用的钻孔设备
CN106944647A (zh) * 2017-04-19 2017-07-14 广东工业大学 一种高多层pcb板深孔钻削加工方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110860710A (zh) * 2019-11-22 2020-03-06 深圳市文地科技有限公司 一种用于加工零件的便于降温的数控机床
CN114310477B (zh) * 2022-03-15 2022-05-20 四川英创力电子科技股份有限公司 印制电路板钻孔设备冷却润滑系统

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4529340A (en) * 1983-03-24 1985-07-16 Wheelabrator-Frye, Inc. Drilling method and apparatus
JPH033713A (ja) * 1989-05-30 1991-01-09 Hitachi Seiko Ltd プリント基板穴明機及びこの穴明機におけるプリント基板押さえ方法
EP0588244A2 (fr) * 1992-09-12 1994-03-23 WÜRTH ELEKTRONIK GmbH & Co. KG Procédé et dispositif pour le perçage de plaquettes de circuits imprimés
US5332341A (en) * 1991-05-30 1994-07-26 Hitachi Seiko Ltd. Pressure foot of printed circuit board drilling apparatus
CN201552324U (zh) * 2009-09-29 2010-08-18 深圳市大族激光科技股份有限公司 印刷电路板钻孔机排屑机构
CN202087453U (zh) * 2010-12-15 2011-12-28 杭州柏年光电标饰有限公司 一种可调喷雾装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102059581B (zh) * 2010-11-23 2012-11-28 深南电路有限公司 一种数控钻头冷却装置及方法
CN202137636U (zh) * 2011-06-13 2012-02-08 广德力达电气有限公司 钻床水冷降温装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4529340A (en) * 1983-03-24 1985-07-16 Wheelabrator-Frye, Inc. Drilling method and apparatus
JPH033713A (ja) * 1989-05-30 1991-01-09 Hitachi Seiko Ltd プリント基板穴明機及びこの穴明機におけるプリント基板押さえ方法
US5332341A (en) * 1991-05-30 1994-07-26 Hitachi Seiko Ltd. Pressure foot of printed circuit board drilling apparatus
EP0588244A2 (fr) * 1992-09-12 1994-03-23 WÜRTH ELEKTRONIK GmbH & Co. KG Procédé et dispositif pour le perçage de plaquettes de circuits imprimés
CN201552324U (zh) * 2009-09-29 2010-08-18 深圳市大族激光科技股份有限公司 印刷电路板钻孔机排屑机构
CN202087453U (zh) * 2010-12-15 2011-12-28 杭州柏年光电标饰有限公司 一种可调喷雾装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105171023A (zh) * 2014-06-06 2015-12-23 大族激光科技产业集团股份有限公司 微针治具的机械钻孔方法及其采用的钻孔设备
CN105171023B (zh) * 2014-06-06 2018-02-02 大族激光科技产业集团股份有限公司 微针治具的机械钻孔方法及其采用的钻孔设备
CN106944647A (zh) * 2017-04-19 2017-07-14 广东工业大学 一种高多层pcb板深孔钻削加工方法

Also Published As

Publication number Publication date
CN104781038A (zh) 2015-07-15
TW201414555A (zh) 2014-04-16

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