EP2454050A1 - Drilling head for printed circuit boards - Google Patents

Drilling head for printed circuit boards

Info

Publication number
EP2454050A1
EP2454050A1 EP10703501A EP10703501A EP2454050A1 EP 2454050 A1 EP2454050 A1 EP 2454050A1 EP 10703501 A EP10703501 A EP 10703501A EP 10703501 A EP10703501 A EP 10703501A EP 2454050 A1 EP2454050 A1 EP 2454050A1
Authority
EP
European Patent Office
Prior art keywords
spindle
rods
pressure foot
head
drilling
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Withdrawn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
EP10703501A
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 EP2454050A1 publication Critical patent/EP2454050A1/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Withdrawn legal-status Critical Current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
    • 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
    • B23Q5/28—Electric drives
    • 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

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. Background information and Prior A rt
  • 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 2 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.
  • Figure 1 is a perspective view from above of the drilling head according to the invention
  • Figure 2 is a front section view along a vertical plane of the drilling head of Figure 1 ;
  • Figure 3 is a plan view from above of the drilling head of Figure 1 without spindle;
  • Figure 4 is a plan view of the pressure foot.
  • 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, for example driven by an AC motor at high frequency, moving along the direction of "Z" with respect to the body 13 by means of an appropriate pneumostatic bushing 41 and bearing a drilling tool 17.
  • the spindle 15 is associated with the body 13 through the pneumostatic bushing 41 and is moved along the axis "Z" by a pair of linear motor 19a, 19b, each with a corresponding coil assembly 21a, 21b, equipped with corresponding winding 23a, 23b, and magnet assembly 25a, 25b fixed to the central body 13 and equipped with corresponding channels of permanent magnets 27a, 27b formed of four magnets per motor orientated by purpose.
  • the linear motors 19a, 19b have equal power and are arranged symmetrically at 180° to the axis "Z" of the drilling head 1 1.
  • the resultant force is coincident with the rotational axis of the spindle, thereby clearly improving the precision of operation of the drilling head.
  • Each coil assembly 21a, 21b is associated with a corresponding pair of rods 29a, 29b by means of an intermediate item 31a, 31b made of aluminum, that joins two rods in the central part of the each pair.
  • the rods 29a, 29b are also associated to the body 13 in such a way that they can slide, running parallel to Z, by matching pairs of high precision ball bushing 33, which guarantee an optimal motion with low friction.
  • the intermediate items 31a, 31b attached to respective pairs of rods 29a, 29b define with them a corresponding sledge independently driving the spindle 15 and, advantageously, the usage of two symmetrically identical sledges according to the invention involves the transfer of motion to the spindle 15, in absence of components perpendicular to the axis "Z", favoring optimal guide within the pneumostatic bushing 41.
  • the lower end of the four rods 29a, 29b is associated with a pressure foot 35 which includes a vacuum pipe 37 to evacuate the chips.
  • the motion between pressure foot 35 and spindle 15 is achieved by four pistons 39a, 39b incorporated in the same pressure foot 35 and whose lower ends of rods 29a, 29b constitute the moving parts inside the piston chamber 41a, 41b cut into the body of pressure foot.
  • the adjustable load of the pressure foot 35 is produced by two of the four opposed pistons 39a, 39b, while the movement of pressure foot 35 toward the spindle 15, for example to check tool height and diameter, is obtained by the other two opposed pistons.
  • a pneumostatic bushing 41 is also installed in body 13 for guiding the sliding movement axially along the Z axis of the spindle 15, while a flange 43 is fixed to the base of the spindle 15 to ensure that the pressure foot chamber is held at negative pressure.
  • Pneumostatic bushing 41 provides almost total absence of friction, excellent accuracy and repeatability of positioning.
  • the stiffness in the radial direction of the sleeve pneumostatic is much higher than the stiffness of the two opposing sledges, thanks to this solution, the sledges adapt elastically to the movement of the mandrel 15 in the bushing 41 that guides the movement in axial direction.
  • a linear transducer is planned or to control the position of the spindle 15 along the Z axis
  • the linear transducer is preferably mounted on one side of the body 13 and cooperates with a fixed reader, thereby avoiding mobile laying cables.

Landscapes

  • Engineering & Computer Science (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, including a central body (13) which is associated with a drilling spindle (15), sliding along a direction "Z" with respect to the central body (13) by means of a pneumostatic bushing (41), and bearing a drilling tool (17), in which said spindle (15) is associated with the central body (13) with the interposition of a pair of linear motors (19a, 19b) arranged at 180° around "Z" axis, so that the resultant force substantially coincides with the axis of the spindle.

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 A rt
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 2 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 the following claims.
Advantageously, according to the invention, thanks to the usage of two symmetric linear motors including matching windings arranged at 180° and fixed to the spindle structure and thanks to the application of permanent magnets it is possible to generate a resultant force from the magnetic field coincident with the rotational axis of the spindle, thereby clearly improving the accuracy of operation of the drilling head.
More advantages derived from the compactness and simplicity of construction can be obtained with the arrangement of the invention.
Not the least advantage of the invention derives from the remarkable ease of disassemble and replacement of the spindle, which, being the part most subject to stress, must in fact be easily accessible and quickly dismantled. 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 perspective view from above of the drilling head according to the invention;
Figure 2 is a front section view along a vertical plane of the drilling head of Figure 1 ;
— Figure 3 is a plan view from above of the drilling head of Figure 1 without spindle;
Figure 4 is a plan view of the pressure foot.
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, for example driven by an AC motor at high frequency, moving along the direction of "Z" with respect to the body 13 by means of an appropriate pneumostatic bushing 41 and bearing a drilling tool 17.
According to the invention, the spindle 15 is associated with the body 13 through the pneumostatic bushing 41 and is moved along the axis "Z" by a pair of linear motor 19a, 19b, each with a corresponding coil assembly 21a, 21b, equipped with corresponding winding 23a, 23b, and magnet assembly 25a, 25b fixed to the central body 13 and equipped with corresponding channels of permanent magnets 27a, 27b formed of four magnets per motor orientated by purpose.
Preferably, according to the invention, the linear motors 19a, 19b have equal power and are arranged symmetrically at 180° to the axis "Z" of the drilling head 1 1. With this arrangement of coils and magnetic channels the resultant force is coincident with the rotational axis of the spindle, thereby clearly improving the precision of operation of the drilling head.
Each coil assembly 21a, 21b is associated with a corresponding pair of rods 29a, 29b by means of an intermediate item 31a, 31b made of aluminum, that joins two rods in the central part of the each pair. The rods 29a, 29b are also associated to the body 13 in such a way that they can slide, running parallel to Z, by matching pairs of high precision ball bushing 33, which guarantee an optimal motion with low friction. The intermediate items 31a, 31b attached to respective pairs of rods 29a, 29b define with them a corresponding sledge independently driving the spindle 15 and, advantageously, the usage of two symmetrically identical sledges according to the invention involves the transfer of motion to the spindle 15, in absence of components perpendicular to the axis "Z", favoring optimal guide within the pneumostatic bushing 41.
The lower end of the four rods 29a, 29b is associated with a pressure foot 35 which includes a vacuum pipe 37 to evacuate the chips. The motion between pressure foot 35 and spindle 15 is achieved by four pistons 39a, 39b incorporated in the same pressure foot 35 and whose lower ends of rods 29a, 29b constitute the moving parts inside the piston chamber 41a, 41b cut into the body of pressure foot.
With this layout and thanks to the fact that the rods 29a, 29b are hollow to let compressed air flow, the air supply tubes to the pressure foot are therefore eliminated, eliminating the risks associated with their failure for excessive wear.
According to the invention, the adjustable load of the pressure foot 35 is produced by two of the four opposed pistons 39a, 39b, while the movement of pressure foot 35 toward the spindle 15, for example to check tool height and diameter, is obtained by the other two opposed pistons.
A pneumostatic bushing 41 is also installed in body 13 for guiding the sliding movement axially along the Z axis of the spindle 15, while a flange 43 is fixed to the base of the spindle 15 to ensure that the pressure foot chamber is held at negative pressure.
Pneumostatic bushing 41 provides almost total absence of friction, excellent accuracy and repeatability of positioning. Advantageously, according to the invention, the stiffness in the radial direction of the sleeve pneumostatic is much higher than the stiffness of the two opposing sledges, thanks to this solution, the sledges adapt elastically to the movement of the mandrel 15 in the bushing 41 that guides the movement in axial direction.
A linear transducer is planned or to control the position of the spindle 15 along the Z axis Advantageously, the linear transducer is preferably mounted on one side of the body 13 and cooperates with a fixed reader, thereby avoiding mobile laying cables.

Claims

1. Drilling head (11) for printed circuit boards, including a central body (13) which is associated with a drilling spindle (15), sliding along a direction "Z" with respect to the central body (13), and bearing a drilling tool (17), characterized by the fact that the spindle (15) is associated with the central body (13) with the interposition of a pair of linear motors (19a, 19b) arranged at 180° around the axis "Z" so that the resultant force substantially coincides with the axis of the spindle.
2. Head in accordance with claim 1, in which the spindle (15) is associated with the central body (13) with the interposition of a pair of linear motors (19a, 19b), each with a corresponding coil assembly (21a, 21b) equipped with corresponding windings (23a, 23b) and magnet assembly (25a, 25b) fixed to the central body (13) and equipped with corresponding channels of permanent magnets (27a, 27b).
3. Head in accordance with claim 2, where each coil assembly (21a, 21b) is associated with a corresponding pair of rods (29a, 29b) at an intermediate item (31a, 31b) in aluminum, uniting the central part of the two rods of each pair.
4. Head according to claim 3 in which the rods (29a, 29b) are also associated to the body (13) in such a way that they can slide, running parallel to Z, by matching pairs of high precision ball bushing 33.
5. Head according to claim 4, in which the intermediate item (31a, 31b) attached to the respective pairs of rods (29a, 29b) define with them a corresponding sledge independently driving the spindle (15).
6. Head according to claim 3 or 4 or 5, in which the lower end of the four rods (29a, 29b) is associated with a pressure foot (35) and where the movement between pressure foot (35) and spindle (15) is achieved by four pistons (39a, 39b) incorporated in the same pressure foot (35) and whose lower ends of the rods (29a, 29b) constitute the moving parts inside the piston chamber 41a, 41b cut into the body of pressure foot.
7. Head in accordance with claim 6, in which these rods (29a, 29b) are hollow to allow the flow of compressed air.
8. Head according to claim 5 or 6, in which the adjustable load of the pressure foot (35) is produced by two of the four opposed pistons (39a, 39b), while the movement of pressure foot 35 toward the spindle 15, for example to check tool height and diameter, is obtained by the other two opposed pistons.
EP10703501A 2009-07-14 2010-01-04 Drilling head for printed circuit boards Withdrawn EP2454050A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH10932009A CH701428A2 (en) 2009-07-14 2009-07-14 drilling head for printed circuit boards.
PCT/IB2010/000004 WO2011007213A1 (en) 2009-07-14 2010-01-04 Drilling head for printed circuit boards

Publications (1)

Publication Number Publication Date
EP2454050A1 true EP2454050A1 (en) 2012-05-23

Family

ID=42174261

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10703501A Withdrawn EP2454050A1 (en) 2009-07-14 2010-01-04 Drilling head for printed circuit boards

Country Status (5)

Country Link
EP (1) EP2454050A1 (en)
CN (1) CN102574256A (en)
CH (1) CH701428A2 (en)
TW (1) TW201102193A (en)
WO (1) WO2011007213A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102756138B (en) * 2012-08-01 2014-03-12 西北工业大学 High-accuracy hole forming method for aircraft wall panel
CN115106566B (en) * 2022-08-19 2023-01-10 成都联星技术股份有限公司 Flexible self-adaptive drilling device

Family Cites Families (4)

* 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
DE9215586U1 (en) * 1991-11-19 1993-02-18 Brandstetter, Heinz Peter, Wien Material processing laser
DE4445283A1 (en) * 1994-12-19 1996-06-20 Emag Masch Vertriebs Serv Gmbh Machine tool
DE19948490C2 (en) * 1999-10-07 2003-05-15 Univ Hannover Linear motor drive

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011007213A1 *

Also Published As

Publication number Publication date
CN102574256A (en) 2012-07-11
CH701428A2 (en) 2011-01-14
WO2011007213A1 (en) 2011-01-20
TW201102193A (en) 2011-01-16

Similar Documents

Publication Publication Date Title
CN103309176B (en) Six-freedom-degree micropositioner with lifting vacuum claw
EP3683464B1 (en) Active magnetic bearing apparatus
CN105099122A (en) Moving-magnet type long-stroke ultra-precision linear motion mechanism
JP5383135B2 (en) Directly driven tool changer with actuator for reciprocating and swiveling motion
CN113446486B (en) Integrated two-way driven fine motion platform and telecontrol equipment
CN102723842A (en) Multi-freedom and long travel magnetic suspension working bench
CN102570767A (en) Small-stroke energy-saving voice coil motor
CN115401472A (en) A moving beam gantry CNC machine tool driven by a linear motor that counteracts magnetic attraction
EP2454050A1 (en) Drilling head for printed circuit boards
CN218217070U (en) Wire bonding equipment XY motor module
CN108173408A (en) A three-degree-of-freedom positioning platform
CN109870881B (en) Macro-micro combined long-stroke precision motion platform
US20080246347A1 (en) Linear motor and machine tool having the same mounted thereon
CN212012419U (en) Surface-mounted magnetic steel equipment suitable for permanent magnet motor rotor
CN215452761U (en) Stable structure alignment platform based on permanent magnet synchronous linear motor
EP2387482A2 (en) Drilling head for printed circuit boards
JP2016051760A (en) Linear motion device and electronic component mounting apparatus
CN216828757U (en) Plate drilling machine and lightweight processing spindle device and transmission mechanism thereof
CN207732608U (en) A kind of Three Degree Of Freedom locating platform
KR20110082183A (en) Dual coil linear motor with compensated cogging force and attractive force
CN215120519U (en) Alignment platform based on moving magnet type permanent magnet synchronous linear motor
CN204116899U (en) Stacked two-dimentional load orientation worktable
CN108092446B (en) Laminated motor shell and magnetic suspension motor
CN224150004U (en) Magnetic levitation rotor assembly, magnetic levitation bearing assembly, motor and compressor
CN213846504U (en) Moving-magnet permanent magnet synchronous linear motor with iron core

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20120213

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20120901