EP2387482A2 - Drilling head for printed circuit boards - Google Patents

Drilling head for printed circuit boards

Info

Publication number
EP2387482A2
EP2387482A2 EP10703347A EP10703347A EP2387482A2 EP 2387482 A2 EP2387482 A2 EP 2387482A2 EP 10703347 A EP10703347 A EP 10703347A EP 10703347 A EP10703347 A EP 10703347A EP 2387482 A2 EP2387482 A2 EP 2387482A2
Authority
EP
European Patent Office
Prior art keywords
spindle
drilling
drilling head
axis
printed circuit
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.)
Withdrawn
Application number
EP10703347A
Other languages
German (de)
French (fr)
Inventor
Angelo Raiteri
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mechatronic SA
Original Assignee
Mechatronic SA
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 Mechatronic SA filed Critical Mechatronic SA
Publication of EP2387482A2 publication Critical patent/EP2387482A2/en
Withdrawn legal-status Critical Current

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
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/22—Feeding members carrying tools or work
    • B23Q5/34—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission
    • B23Q5/36—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission in which a servomotor forms an essential element
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/0011—Working of insulating substrates or insulating layers
    • H05K3/0044—Mechanical working of the substrate, e.g. drilling or punching
    • H05K3/0047—Drilling of holes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/10—Using electric, magnetic and electromagnetic fields; Using laser light
    • H05K2203/104—Using magnetic force, e.g. to align particles or for a temporary connection during processing

Definitions

  • the present invention relates to a drilling head for printed circuit boards.
  • the invention relates to a drilling head, which can be incorporated into a drilling machine for printed circuit boards.
  • Printed circuit boards are made of epoxy resin reinforced with glass fiber coated with a layer of copper, which is then photo-etched according to the circuit to achieve. The boards are drilled in a series of positions to allow the connection between points in the electrical circuit on both sides of the plate and to insert any discrete or integrated electronic components.
  • Machining printed circuit boards requires more and more machines which can operate with high flexibility and productivity.
  • a range of drilling heads has been proposed in the past on drilling machines, typically equipped with six drilling heads, designed to simultaneously drill a corresponding stack of circuit boards.
  • the stack of boards is usually obtained by stacking a number of identical boards on a backup panel in Bakelite or cardboard and covering the stack with a thin aluminum foil or similar entry material. The stack is held together and placed on the tooling plate of the machine by means of two reference pins.
  • the current drilling machine for printed circuit boards generally comprise a table translating along a first direction (Y axis), a cart translating along a second direction (X axis) orthogonal to the first which bears several drilling heads which can move along a third direction (Z axis) perpendicular to the first two.
  • a drilling head of prior art comprises a linear or rotary motor that gives motion to the head along the Z axis, a flexible coupling, a linear guide or pneumostatic bushing, guiding the drilling head along the Z axis, a spindle carrying a drilling tool, usually driven by asynchronous motor and a pressure foot, usually consisting of a pneumatic system that applies a force to the stack of circuit boards, as close as possible to the point where the drilling occurs.
  • the purpose of the invention is to create a drilling head for printed circuit boards that overcomes the drawbacks of the prior art and thus more efficient and productive compared to heads currently in use.
  • a further aim of the invention is to provide a drilling head of that type, that is easy and economical and can therefore be produced industrially at a lowest cost.
  • the linear motor that drives the movement of the spindle along the axis Z is substantially integrated into the spindle itself and being the resultant force of the three axial components originated by the magnetic fields produced by the coils of said motor substantially coincident with the
  • a further advantage of the invention derives from the considerable ease of disassemble and replacement of the spindle, which, being the most stressed part, must in fact be easily accessible and quickly removable.
  • Figure 1 is a front view of the drilling head according to the invention in which the pressure foot is depicted;
  • Figure 2 is a side view of the drilling head of Figure 1 ;
  • Figure 3 is a view from above of the drilling head of Figure 1 ;
  • - Figure 4 is a perspective view of the drilling head of Figure 1.
  • the drilling head which is indicated as a whole by reference 11, includes a central body 13 which is associated with a drilling spindle 15, moving along the direction "Z" with respect to the central body 13, and bearing a drilling tool 16.
  • the support 13 is preferably provided with holes 17 to allow fixing the drilling head 11 to a support structure which is part of a drilling machine for printed circuit boards.
  • the spindle 15 is driven by a high frequency synchronous motor, this type of motors being notoriously well known for high torque at low speeds and a high efficiency and consequent reduced heat generation, which is the main source of poor accuracy of drilling.
  • the spindle 15 is associated with the central body 13 with the interposition of a linear motor 19 comprising three coils 19a, 19b, 19c, arranged at 120 ° around the axis Z passing through the drilling tool 16 and fixed to the structure of the spindle 15, immersed in the magnetic field generated by three corresponding channels of permanent magnets.
  • a linear motor 19 comprising three coils 19a, 19b, 19c, arranged at 120 ° around the axis Z passing through the drilling tool 16 and fixed to the structure of the spindle 15, immersed in the magnetic field generated by three corresponding channels of permanent magnets.
  • the three axial components of the magnetic forces produced by coils 19a, 19b, 19c generate a resultant substantially coincident with the axis "Z" of the spindle 15, thus improving clearly the accuracy and performance of the drilling head.
  • the drilling head 11 also incorporates a pneumostatic bushing 21 to guide the spindle 15 along the Z axis, an optical scale 23 to generate a signal indicating the position of the spindle 15 along the Z axis and a pressure foot 25.
  • This pressure foot 25 is substantially a cylindrical ring 25a with a base 25b which is partially closed in which there is a passage 25c for the drilling tool 16.
  • an external portion 25d of the base 25a is shaped around said central passage 25c allowing to exert the necessary pressure on the stack closely around the area in which the hole is drilled.
  • the invention also provides for the interposition between the spindle 15 and pneumostatic bushing 21 a particular flange 27, which allows to move the pressure foot 25 upwards during tool change and automatic tool laser measurement.
  • This solution allows to install a longer pneumostatic than the solutions adopted in the past, obtaining a more accurate guide for the spindle inside the pneumostatic bushing 21.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mechanical Engineering (AREA)
  • Drilling And Boring (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

Drilling head (11) for printed circuit boards, includes a central body (13) which is associated with a drilling spindle (15), moving along the direction "Z" with respect to the central body (13), and bearing a drilling tool (16), in which said spindle (15) is associated with the central body (13) with the interposition of a linear motor (19) comprising three coils (19a, 19b, 19c,) arranged at 120° around the "Z" axis and fixed to the structure of the spindle (15), immersed in the magnetic field generated by a corresponding channel of permanent magnets so that the three axial components of the magnetic forces produced by the three coils (19a, 19b, 19c) generate a resultant which coincides substantially with "Z" axis of the spindle (15), thus improving in significant way the accuracy and performance of the drilling head.

Description

Drilling head for printed circuit boards
DESCRIPTION
Field of the Invention
The present invention relates to a drilling head for printed circuit boards.
More specifically, the invention relates to a drilling head, which can be incorporated into a drilling machine for printed circuit boards.
Background information and Prior Art
Printed circuit boards are made of epoxy resin reinforced with glass fiber coated with a layer of copper, which is then photo-etched according to the circuit to achieve. The boards are drilled in a series of positions to allow the connection between points in the electrical circuit on both sides of the plate and to insert any discrete or integrated electronic components.
Machining printed circuit boards requires more and more machines which can operate with high flexibility and productivity. For this purpose a range of drilling heads has been proposed in the past on drilling machines, typically equipped with six drilling heads, designed to simultaneously drill a corresponding stack of circuit boards. The stack of boards is usually obtained by stacking a number of identical boards on a backup panel in Bakelite or cardboard and covering the stack with a thin aluminum foil or similar entry material. The stack is held together and placed on the tooling plate of the machine by means of two reference pins.
The current drilling machine for printed circuit boards generally comprise a table translating along a first direction (Y axis), a cart translating along a second direction (X axis) orthogonal to the first which bears several drilling heads which can move along a third direction (Z axis) perpendicular to the first two. In general, a drilling head of prior art comprises a linear or rotary motor that gives motion to the head along the Z axis, a flexible coupling, a linear guide or pneumostatic bushing, guiding the drilling head along the Z axis, a spindle carrying a drilling tool, usually driven by asynchronous motor and a pressure foot, usually consisting of a pneumatic system that applies a force to the stack of circuit boards, as close as possible to the point where the drilling occurs.
In prior art these different parts of the drilling head, once assembled, are heavy and bulky items, making the conventional machine massive. Furthermore the high count of mechanical couplings between the various parts of existing machines lead to difficulties in installation and maintenance, significantly impairing performance. As known, in fact, in the drilling of printed circuit plates, the performance in terms of acceleration along the Z axis provides the greatest contribution to overall productivity of the machine. The purpose of the invention is to create a drilling head for printed circuit boards that overcomes the drawbacks of the prior art and thus more efficient and productive compared to heads currently in use.
A further aim of the invention is to provide a drilling head of that type, that is easy and economical and can therefore be produced industrially at a lowest cost.
Description of Invention
These and other aims are achieved with the drilling head for printed circuit boards, as claimed in claims combined.
Advantageously, according to the invention, since the linear motor that drives the movement of the spindle along the axis Z is substantially integrated into the spindle itself and being the resultant force of the three axial components originated by the magnetic fields produced by the coils of said motor substantially coincident with the
"Z" axis of the spindle, the accuracy and performance of the drilling head are noticeably improved compared to existing devices. Due to the integration and the compactness of the constituent parts of the drilling head according to the invention, it is easy to build it, with reduced production cost.
A further advantage of the invention derives from the considerable ease of disassemble and replacement of the spindle, which, being the most stressed part, must in fact be easily accessible and quickly removable. Description of Figures
One form of implementation of the drilling head according to the invention will be described below, merely for example, with reference to the attached figures in which: Figure 1 is a front view of the drilling head according to the invention in which the pressure foot is depicted;
Figure 2 is a side view of the drilling head of Figure 1 ; Figure 3 is a view from above of the drilling head of Figure 1 ; - Figure 4 is a perspective view of the drilling head of Figure 1.
Description of the preferred embodiment
With reference to the attached figures, the drilling head according to the invention, which is indicated as a whole by reference 11, includes a central body 13 which is associated with a drilling spindle 15, moving along the direction "Z" with respect to the central body 13, and bearing a drilling tool 16.
The support 13 is preferably provided with holes 17 to allow fixing the drilling head 11 to a support structure which is part of a drilling machine for printed circuit boards. Preferably, the spindle 15 is driven by a high frequency synchronous motor, this type of motors being notoriously well known for high torque at low speeds and a high efficiency and consequent reduced heat generation, which is the main source of poor accuracy of drilling.
According to the invention, the spindle 15 is associated with the central body 13 with the interposition of a linear motor 19 comprising three coils 19a, 19b, 19c, arranged at 120 ° around the axis Z passing through the drilling tool 16 and fixed to the structure of the spindle 15, immersed in the magnetic field generated by three corresponding channels of permanent magnets.
Advantageously, according to the invention, the three axial components of the magnetic forces produced by coils 19a, 19b, 19c generate a resultant substantially coincident with the axis "Z" of the spindle 15, thus improving clearly the accuracy and performance of the drilling head.
Also according to the invention, the drilling head 11 also incorporates a pneumostatic bushing 21 to guide the spindle 15 along the Z axis, an optical scale 23 to generate a signal indicating the position of the spindle 15 along the Z axis and a pressure foot 25. This pressure foot 25 is substantially a cylindrical ring 25a with a base 25b which is partially closed in which there is a passage 25c for the drilling tool 16. According to the invention, an external portion 25d of the base 25a is shaped around said central passage 25c allowing to exert the necessary pressure on the stack closely around the area in which the hole is drilled.
The invention also provides for the interposition between the spindle 15 and pneumostatic bushing 21 a particular flange 27, which allows to move the pressure foot 25 upwards during tool change and automatic tool laser measurement. This solution allows to install a longer pneumostatic than the solutions adopted in the past, obtaining a more accurate guide for the spindle inside the pneumostatic bushing 21.

Claims

1. Drilling head (11) for printed circuit boards, including a central body (13) which is associated with a drilling spindle (15), moving along a direction "Z" with respect to the central body (13), and bearing a drilling tool (16), characterized by the fact that the
5 spindle (15) is associated with the support (13) with the interposition of a linear motor (19) comprising three coils (19a, 19b, 19c,) arranged at 120° around the axis "Z" and fixed to the structure of the spindle (15), immersed in the magnetic field generated by a corresponding channel of permanent magnets, so that the three axial components of the magnetic forces produced by the three coils (19a, 19b, 19c) generate a resultant 10 substantially coincident with the Z axis of the spindle (15).
2. Drilling head (1 1) according to claim 1, in which the central body (13) is fixed to a support structure which is part of a drilling machine for printed circuit boards.
3. Drilling head (11) according to claim 1 or 2, in which the spindle (15) is driven by a synchronous motor at high frequency.
15 4. Drilling head according to any of claims 1 to 3, in which it is also used a pneumostatic bushing (21) for guiding the spindle on "Z" axis.
5. Drilling head according to any of the preceding claims, in which a pressure foot (25) is used comprising a cylindrical ring (25a) with a base (25b) partially closed in which there is a passage (25c) for the drilling tool (16) and an external portion (25d) of the
20 base (25a) is shaped around said central passage (25c) allowing to exert the necessary pressure on the stack.
6. Drilling head according to claim 4 and 5, where between the spindle (15) and the pneumostatic bushing (21) a flange (27) is placed which allows to move the pressure foot (25) upwards.
ZJ> =====
EP10703347A 2009-01-14 2010-01-04 Drilling head for printed circuit boards Withdrawn EP2387482A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH492009A CH700219A2 (en) 2009-01-14 2009-01-14 drilling head for printed circuit boards.
PCT/IB2010/000017 WO2010082105A2 (en) 2009-01-14 2010-01-04 Drilling head for printed circuit boards

Publications (1)

Publication Number Publication Date
EP2387482A2 true EP2387482A2 (en) 2011-11-23

Family

ID=42184059

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10703347A Withdrawn EP2387482A2 (en) 2009-01-14 2010-01-04 Drilling head for printed circuit boards

Country Status (5)

Country Link
EP (1) EP2387482A2 (en)
CN (1) CN102271862A (en)
CH (1) CH700219A2 (en)
TW (1) TW201026434A (en)
WO (1) WO2010082105A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107175360B (en) * 2016-03-10 2019-07-26 无锡深南电路有限公司 Milling machine and milling machine spindle operation control system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4869626A (en) * 1986-04-18 1989-09-26 Dynamotion Corporation High speed drilling spindle
DE4037716C1 (en) * 1990-11-27 1992-04-09 Hitachi Seiko, Ltd., Ebina, Kanagawa, Jp
TW368785B (en) * 1995-11-15 1999-09-01 Hitachi Via Mechanics Ltd Fixture for printed circuit board
DE19650360A1 (en) * 1996-10-28 1998-05-07 Wurst Karl Heinz Dr Ing Drive unit for machine tool
DE10213408A1 (en) * 2002-03-26 2003-10-16 Linatec Kg Linear direct drive system of machine, consists of synchronous linear motor with triangular-section linear rotor member inside hollow triangular stator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010082105A2 *

Also Published As

Publication number Publication date
CH700219A2 (en) 2010-07-15
CN102271862A (en) 2011-12-07
WO2010082105A3 (en) 2010-10-07
WO2010082105A2 (en) 2010-07-22
TW201026434A (en) 2010-07-16

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