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)

Applications Claiming Priority (2)

Publications (1)

Family

ID=42184059

Family Applications (1)

Country Status (5)

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Family Cites Families (5)

• 2009
  • 2009-01-14 CH CH492009A patent/CH700219A2/it not_active Application Discontinuation
  • 2009-12-31 TW TW98146577A patent/TW201026434A/zh unknown
• 2010
  • 2010-01-04 WO PCT/IB2010/000017 patent/WO2010082105A2/en not_active Ceased
  • 2010-01-04 EP EP10703347A patent/EP2387482A2/de not_active Withdrawn
  • 2010-01-04 CN CN2010800043030A patent/CN102271862A/zh active Pending

Non-Patent Citations (1)

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