CN115503366A - Ink jet printing method for PCB printing - Google Patents
Ink jet printing method for PCB printing Download PDFInfo
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- CN115503366A CN115503366A CN202211383355.4A CN202211383355A CN115503366A CN 115503366 A CN115503366 A CN 115503366A CN 202211383355 A CN202211383355 A CN 202211383355A CN 115503366 A CN115503366 A CN 115503366A
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- 238000007639 printing Methods 0.000 title claims abstract description 201
- 238000007641 inkjet printing Methods 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 60
- 239000007921 spray Substances 0.000 claims abstract description 30
- 230000003068 static effect Effects 0.000 claims abstract description 8
- 229910000679 solder Inorganic materials 0.000 claims description 60
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- 238000004519 manufacturing process Methods 0.000 abstract description 20
- 230000000694 effects Effects 0.000 abstract description 10
- 239000000976 ink Substances 0.000 description 32
- 230000003028 elevating effect Effects 0.000 description 5
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- 229910052802 copper Inorganic materials 0.000 description 4
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/0041—Digital printing on surfaces other than ordinary paper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J25/00—Actions or mechanisms not otherwise provided for
- B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J25/00—Actions or mechanisms not otherwise provided for
- B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
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- 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
- H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
- H05K3/12—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns
- H05K3/1241—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns by ink-jet printing or drawing by dispensing
- H05K3/125—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns by ink-jet printing or drawing by dispensing by ink-jet printing
Abstract
The invention relates to an ink-jet printing method for PCB printing, after a CCD target positioning system grabs the actual size of a PCB, a workbench clamping the PCB starts to move along the X positive direction from the positive printing initial position, an ink-jet printing trolley is static and jets ink towards the PCB through a lower spray head component until the positive printing is finished; then, the workbench starts to move along the X reverse direction from the reverse printing initial position, the ink-jet printing trolley is static and jets ink to the PCB through the lower nozzle assembly until the reverse printing is finished; in the forward printing and the reverse printing process, different curing energy is provided by the UV lamp, so that the printing work can be performed in the reciprocating motion of the workbench, the ink-jet printing of characters can be completed in one reciprocating motion, the production efficiency is greatly improved, the effect of doubling the production speed is realized, the production cost is saved, the printing device is particularly suitable for the PCB solder-resisting ink-jet printing, the two aspects of precision and thickness can be efficiently considered, and the solder-resisting printing effect is effectively ensured.
Description
Technical Field
The invention relates to the technical field of ink-jet printing equipment, in particular to an ink-jet printing method for PCB printing.
Background
A Printed Circuit Board (PCB), which is called a Printed Circuit Board (PCB) in chinese, is an important electronic component, a support for an electronic component, and a carrier for electrical connection of the electronic component.
The main process of the PCB circuit layer production process is screen printing, and is also called "printed" circuit board. In the prior art, the character layer on the PCB is also manufactured by screen printing, various defects of the screen printing process are not suitable for the requirement of modern large-scale production, and the PCB ink-jet printing becomes the key point of intelligent modification of the current PCB production factory.
The PCB digital character ink-jet printer on the market at present generally adopts the unidirectional ink-jet printing mode, and is inefficient, has the defects of lower positioning precision, high rejection rate and the like, and can not meet the requirements of industrialized mass production: on the basis of ensuring the quality, the digital character ink-jet speed of the PCB can reach more than 8 pieces/min to form an automatic line with the previous procedure, the manual link is replaced, the digital character ink-jet printer of the PCB in the existing market can only reach 4-5 pieces/min, the digital character ink-jet printer cannot form an automatic production line with the previous procedure, the PCB of the previous procedure needs to be manually collected, and the digital character ink-jet printer of the PCB is installed to start character ink-jet after waiting; in addition, because the positioning accuracy is low, the accurate printing of the industrial-grade variable data two-dimensional code cannot be realized, and the two-dimensional code is still laser-etched by adopting the laser technology after the traditional white oil block is printed, so that the waste of great materials and human resources is caused, the production efficiency is extremely low, the processing time is too long, and the cost is high.
The existing solder mask ink jet printing printers on the market still adopt one-way printing, and cannot meet the requirements of industrial mass production; the positioning accuracy is low, the accurate printing of an industrial solder mask bridge and a solder mask windowing can not be realized, the requirement that the printing accuracy reaches +/-10 micrometers and the printing thickness reaches 40 micrometers in solder mask ink jet can not be met, and the precision and the thickness can not be considered; the existing printing mode can only meet the requirement of thickness and cannot ensure the precision, a large number of unqualified products are caused, and materials and human resources are greatly wasted.
In addition, in the digital character inkjet printer for PCBs in the prior art, in order to adapt to the printing of PCBs with different thicknesses and different requirements, the upper inkjet printing head can be moved and adjusted on the Z axis, so that the structure of the inkjet printing head is complex; in addition, during the up-and-down movement process of the ink-jet printing head, severe fluctuation of ink is easily caused to influence the printing stability, and even the ink is splashed outwards due to fluctuation; when a motor or a coupler suddenly breaks down, the printing head integrally slides down or even collides with the workbench, and serious property loss or even personal injury is caused.
Disclosure of Invention
The applicant provides an ink jet printing method for PCB printing with a reasonable structure aiming at the defects in the prior art, so that the printing work can be carried out in the reciprocating motion of a workbench, the production efficiency is greatly improved, the effect of doubling the production speed is realized, the production cost is saved, the method is particularly suitable for the PCB solder-resisting ink jet printing, and the two aspects of precision and thickness can be effectively considered.
The technical scheme adopted by the invention is as follows:
an ink jet printing method for PCB printing comprises a workbench moving along the length direction of an X-direction guide rail component, an ink jet printing trolley arranged above the workbench and two sets of CCD target positioning systems; the single group of CCD target positioning system and the ink-jet printing trolley respectively move along the Y direction;
the printing method includes the steps of:
the workbench clamping the PCB moves along the X positive direction, and the actual size of the PCB is grabbed by combining the two sets of CCD target positioning systems;
the workbench moves to the positive printing starting position along the X direction, and the ink-jet printing trolley moves to the position above the corresponding PCB along the Y direction;
when the forward printing is started, the ink-jet printing trolley is static and jets ink towards the PCB through the lower sprayer assembly, and the PCB moves in an accelerating manner along with the workbench along the X forward direction until the forward printing is finished;
the workbench is positioned at a reverse printing initial position, reverse printing is started, the ink-jet printing trolley is static and jets ink towards the PCB through the lower sprayer assembly, and the PCB moves in an accelerating manner along the X reverse direction along with the workbench until the reverse printing is finished;
and finishing one-time reciprocating printing of the PCB after the reverse printing is finished.
As a further improvement of the technical scheme:
the bottom surface of the ink-jet printing trolley is also provided with a lamp group, the lamp group provides curing energy for the forward printing and reverse printing processes, and the curing energy required in the reverse printing is higher than that required in the forward printing.
The lamp group comprises a first UV lamp arranged in front of the spray head assembly and a second UV lamp arranged behind the spray head assembly; in the forward printing process, a first UV lamp in front is turned on to work; and in the reverse printing process, the first UV lamp and the second UV lamp are both lighted to work.
The energy of the UV lamp during the operation of one lamp is 250mj/cm 2 -350mj/cm 2 (ii) a The total energy of the UV lamp I and the UV lamp II during the lamp-on work is 600mj/cm 2 -800mj/cm 2 。
The inkjet printing trolley and the two sets of CCD target point positioning systems are arranged on the main cross beam in a back-to-back mode, the main cross beam stretches across the X-direction guide rail assembly, the inkjet printing trolley is movably arranged on the front side face of the main cross beam through the Y-direction guide rail assembly I, the Y-direction guide rail assembly II is arranged on the rear side face of the main cross beam, and the two sets of CCD target point positioning systems respectively move in the Y direction along the Y-direction guide rail assembly II; and a CCD (charge coupled device) spray head positioning system which moves together is fixedly arranged on the ink-jet printing trolley, and the actual position of the spray head component on the ink-jet printing trolley is obtained by the CCD spray head positioning system.
The ink-jet printing trolley comprises two groups which independently move along the Y direction and are respectively a fine printing trolley and a large-ink-volume filling printing trolley; the fine printing trolley prints an outer frame of a solder mask windowing area and a solder mask bridge area on the PCB, and then the printing trolley is filled with large amount of ink to perform filling printing of a solder mask green oil area on the PCB; the minimum ink drop value of the fine printing trolley is smaller than the minimum ink drop value of the large ink filling printing trolley, and the original resolution of the fine printing trolley is larger than the original resolution of the large ink filling printing trolley; and a CCD (charge coupled device) spray head positioning system which moves together is fixedly arranged on the fine printing trolley, and the CCD spray head positioning system acquires the actual position of the spray head assembly on the fine printing trolley.
In one-time reciprocating printing of the PCB along with the workbench, the fine printing trolley repeatedly performs printing of an outer frame of the solder mask windowing area and a solder mask bridge area, so that the printing thickness is increased; in one-time reciprocating printing of the PCB along with the workbench, the large-ink-volume filling printing trolley repeatedly performs filling printing of the solder resist green oil area, so that the printing thickness in the solder resist green oil area is increased.
The two groups of ink-jet printing trolleys are arranged on the main beam in a back-to-back mode, the main beam stretches across the X-direction track assembly, the fine printing trolley is movably arranged on the front side face of the main beam through the Y-direction track assembly I, and the large-ink-volume filling printing trolley is movably arranged on the rear side face of the main beam through the Y-direction track assembly II; the CCD target positioning system comprises a main beam and two sets of CCD target positioning systems, and is characterized by further comprising auxiliary beams arranged behind the main beam at intervals in parallel, Y-direction track assemblies III are installed on the side faces of the auxiliary beams, and the two sets of CCD target positioning systems respectively move in the Y direction along the Y-direction track assemblies III.
The workbench is provided with two groups which independently run, and a single group of workbench moves along the corresponding X-direction guide rail component in the X direction; the two groups of working tables respectively bear the PCB and alternately move to the CCD target positioning system for actual size capture or move to the ink-jet printing trolley for printing, so that the ink-jet printing trolley continuously works in combination with the movement along the Y direction.
The workbench is slidably mounted on the X-direction guide rail assembly through a wedge lifting platform, the wedge lifting platform drives the workbench to move up and down, and the distance between a PCB (printed circuit board) on the top surface of the workbench and the upper sprayer assembly is adjusted; the X-direction guide rail assembly is installed on the marble base, and the marble base is installed on the double-layer shockproof chassis.
The invention has the following beneficial effects:
in the invention, the ink-jet printing trolley and the UV lamp are matched for printing in the forward movement and the backward movement of the workbench along the X direction, so that the printing can be carried out in the back-and-forth movement of the workbench, and the ink-jet printing of the digital characters on the PCB can be completed in one back-and-forth movement, thereby greatly improving the production efficiency, realizing the effect of doubling the production speed and saving the production cost; the method is particularly suitable for solder mask ink jet printing of the PCB, can efficiently take into account of two aspects of precision and thickness, and effectively ensures the solder mask printing effect;
the efficiency of the ink-jet printing of the PCB digital characters can reach more than 8 chips/min, and the ink-jet printing can be effectively matched with the previous working procedure of the PCB, so that the circulation of personnel among the working procedures is avoided, and the labor is greatly saved;
in the invention, the CCD target positioning system is used for detecting the actual size of the PCB, so that the printed image is matched with the corresponding PCB in real time;
in the invention, the CCD sprayer positioning system is used for detecting the actual position of the sprayer assembly, so that the printing position of the sprayer assembly relative to the PCB can be adjusted according to the actual condition, and the problem of access between the actual position and the design position of the sprayer assembly caused by assembly and processing is effectively solved; meanwhile, the precision requirements on the main beam, the main beam side track assembly and the like are reduced, and the device is more convenient to produce, adjust and use;
according to the invention, the actual positions of the PCB and the nozzle assembly during printing are effectively and reliably ensured by the CCD target positioning system and the CCD nozzle positioning system, so that the printing positioning precision is high, the method can be suitable for accurate printing of industrial-grade variable data two-dimensional codes, and the method can be used for replacing the existing laser technology; meanwhile, two groups of different ink-jet printing trolleys are combined, so that the device is also suitable for solder resist ink-jet printing, and the matching of dual requirements on precision and thickness is effectively realized;
in the invention, the ink-jet printing trolley only moves along the Y direction, and the adjustment of the distance between the ink-jet printing trolley and the PCB below is realized by the workbench, thereby effectively solving a plurality of problems caused by the up-and-down movement of the existing ink-jet printing trolley; and the workbench can move up and down by the wedge elevating platform, so that the precision, stability and reliability of the up-and-down movement are effectively ensured.
Drawings
FIG. 1 is a schematic view of the printing state of the ink jet printer according to the present invention.
Fig. 2 is a front view of the ink jet printer of the present invention.
Fig. 3 is a rear view of the ink jet printer of the present invention.
Fig. 4 is a schematic view of another printing state of the ink jet printer of the present invention.
FIG. 5 is a schematic illustration of solder mask ink jet printing according to the present invention.
Fig. 6 is a schematic structural view of the wedge elevating platform of the present invention.
Fig. 7 is a schematic structural diagram of the lamp set of the present invention.
Wherein: 1. an X-direction guide rail assembly; 2. a work table; 3. an inkjet printing carriage; 4. a CCD spray head positioning system; 5. a main cross beam; 6. a CCD target positioning system; 7. a wedge elevating platform; 8. a secondary cross beam; 9. a lamp group; 10. a double-layer shockproof underframe; 11. a marble base;
21. a copper pad region; 22. a solder mask windowing region; 23. a solder mask green oil area; 24. a solder bridge resistance area;
30. a showerhead assembly;
51. a first Y-direction track assembly; 52. a Y-direction track assembly II; 53. a Y-direction track assembly III;
71. a base; 72. a translation guide assembly; 73. a longitudinal movement guide assembly; 74. a lower wedge seat; 75. a tilt guide assembly; 76. an upper wedge seat; 77. a motor;
91. a first UV lamp; 92. and a second UV lamp.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1, fig. 2 and fig. 3, the inkjet printing method for PCB printing of the present embodiment includes a worktable 2 moving along the length direction of an X-direction guide rail assembly 1, an inkjet printing cart 3 disposed above the worktable 2, and two sets of CCD target positioning systems 6; the single group of CCD target point positioning system 6 and the ink-jet printing trolley 3 respectively move along the Y direction;
the printing method comprises the following steps:
the first step is as follows: the workbench 2 holding the PCB moves along the positive X direction, and the actual size of the PCB is grabbed by combining two sets of CCD target positioning systems 6;
according to the actual information of the PCB acquired by the two groups of CCD target positioning systems 6, the pre-printed image is subjected to automatic expansion and contraction processing, so that the size of the pre-printed image is matched with that of the PCB; the concrete mode is as follows:
the worktable 2 holding the PCB moves along the positive X direction until the rear edge of the PCB is positioned in the acquisition area of the CCD target positioning system 6, and the two groups of CCD target positioning systems 6 acquire information of the target points at the rear edge of the PCB; the workbench 2 continuously moves along the positive X direction until the front edge of the PCB is positioned in the acquisition area of the CCD target positioning system 6, and the two groups of CCD target positioning systems 6 acquire information of the target points on the front edge of the PCB; and obtaining the actual size of the PCB according to four groups of information collected by the two groups of CCD target positioning systems 6.
The second step is that: the workbench 2 moves to a forward printing starting position along the X direction, and the ink-jet printing trolley 3 moves to the position above the corresponding PCB along the Y direction;
the third step: when the forward printing is started, the ink-jet printing trolley 3 is static and jets ink to the PCB through the lower spray head assembly 30, and the PCB moves in an accelerating manner along the X positive direction along with the workbench 2 until the forward printing is finished;
the fourth step: the workbench 2 is positioned at a reverse printing initial position, the reverse printing is started, the ink-jet printing trolley 3 is static and jets ink to the PCB through the lower spray head assembly 30, and the PCB moves in an accelerating manner along the workbench 2 along the reverse direction X until the reverse printing is finished;
the fifth step: and after the reverse printing is finished, completing one-time reciprocating printing of the PCB.
For the digital character ink-jet printing of the PCB, the workbench 2 is matched with the ink-jet printing trolley to perform the printing work in the forward movement and the reverse movement along the X direction, so that the digital character ink-jet printing work on the PCB can be completed in one reciprocating movement of the workbench 2; and after the reverse printing is finished, the PCB moves to the front feeding position along with the workbench 2, and the blanking and feeding replacement of the PCB are carried out.
Certainly, also can match with PCB hinders and welds ink jet printing, through the continuous printing in workstation 2 back and forth movement, greatly helps in promoting to hinder and welds printing efficiency.
In one embodiment, the bottom surface of the inkjet printing trolley 3 is also provided with a lamp set 9, the lamp set 9 provides curing energy for the forward printing process and the reverse printing process, and the curing energy required in the reverse printing process is higher than that required in the forward printing process.
When the ink-jet printing trolley 3 moves back and forth between the two groups of work tables 2 to work alternately, the lamp group 9 moves synchronously along with the ink-jet printing trolley 3 and is switched between the two groups of work tables 2.
The solidification energy that the positive direction was printed is less, and the image ink that the china ink volume is big of being convenient for levels naturally to eliminate and beat the inherent vertical stripe of printer head, surface energy is unanimous when making the printing the second time, and the cohesion of reverse reprinting can strengthen more than one time, thereby effectively solve the flaw problem of inherent white oil cake stripe among the prior art in the trade, greatly helping hand in promoting the printing effect.
In the embodiment shown in fig. 7, the lamp set 9 includes a first UV lamp 91 disposed in front of the showerhead assembly 30 and a second UV lamp 92 disposed in back of the showerhead assembly 30; in the forward printing process, a first 91 front UV lamp works; during the reverse printing, the first UV lamp 91 and the second UV lamp 92 are both turned on.
In this embodiment, the first UV lamp 91 and the second UV lamp 92 are ultraviolet curing lamps that operate independently of each other.
Further, the energy of the UV lamp-91 during the lighting operation is 250mj/cm 2 -350mj/cm 2 (ii) a The total energy of the first UV lamp 91 and the second UV lamp 92 during the lamp-on work is 600mj/cm 2 -800mj/cm 2 。
In the embodiment shown in fig. 1, the inkjet printing cart 3 and the two sets of CCD target positioning systems 6 are mounted on the main beam 5 in a reverse manner, the main beam 5 is disposed across the X-direction rail assembly 1, the inkjet printing cart 3 is mounted on the front side surface of the main beam 5 through the first Y-direction rail assembly 51 in a movable manner, the second Y-direction rail assembly 52 is mounted on the rear side surface of the main beam 5, and the two sets of CCD target positioning systems 6 respectively move in the Y direction along the second Y-direction rail assembly 52; the CCD nozzle positioning system 4 which moves together is fixedly arranged on the ink-jet printing trolley 3, and the actual position of the nozzle assembly 30 on the ink-jet printing trolley 3 is obtained by the CCD nozzle positioning system 4.
In this embodiment, the CCD target positioning system 6 and the inkjet printing cart 3 are respectively disposed on two opposite sides of the main beam 5, so that they can work independently to influence the movement along the Y direction.
In this embodiment, the CCD nozzle positioning system 4 detects the actual position of the nozzle assembly 30, so that the printing position of the nozzle assembly 30 relative to the PCB can be adjusted according to the actual situation, the printing position accuracy is effectively ensured, and the problem of coming in and going out between the actual position and the design position of the nozzle assembly 30 due to assembly and processing is effectively solved; meanwhile, the precision requirements for the main beam 5 and the first Y-direction track assembly 51 and the second Y-direction track assembly 52 on the two sides of the main beam 5 are reduced, and the device is more convenient to produce, adjust and use practically.
In the prior art, in actual production, because the nozzle motion guide rail and the camera motion guide rail are not on the same plane, and the guide rails on two sides are heated differently due to heat generated by a linear motor in a mobile module, the position of the nozzle assembly 30 is often deviated from the designed position, and even differences exist in continuous work, so that the printing precision is low; through the data acquisition to shower nozzle subassembly 30 position in this embodiment, can carry out the adjustment of adaptability to shower nozzle subassembly 30 in Y position, PCB board in X position to when printing according to actual conditions to effectively guarantee actual printing precision.
The operating frequency of the CCD nozzle positioning system 4 may be set according to actual conditions, for example, the operating frequency may be detected one by one with the replacement of the PCB, or a certain operating frequency may be set, for example, the position of the nozzle assembly 30 is detected and adjusted after every hundred PCBs are printed, so as to effectively eliminate the change of the position of the nozzle assembly 30 during the use process caused by machining, assembly, and the like.
The number of the ink-jet printing trolleys 3 in the embodiment is a group, so that the ink-jet printing trolleys are particularly suitable for ink-jet printing of digital characters on a PCB (printed circuit board), and the printing efficiency is effectively improved and the printing effect is ensured through continuous work of the ink-jet printing trolleys 3 in the reciprocating motion process of the workbench 2.
In the embodiment shown in fig. 4 and 5, the inkjet printing carriage 3 comprises two sets independently moving in the Y direction, respectively a fine printing carriage and a large ink volume filling printing carriage; printing the outer frame of the solder mask windowing area 22 and the solder mask bridge area 24 on the PCB by the fine printing trolley, and then filling and printing the solder mask green oil area 23 on the PCB by the large-ink-volume filling printing trolley; the minimum ink drop value of the fine printing trolley is smaller than the minimum ink drop value of the large ink filling printing trolley, and the original resolution of the fine printing trolley is larger than the original resolution of the large ink filling printing trolley; the CCD spray head positioning system 4 which moves together is fixedly arranged on the fine printing trolley, and the actual position of the spray head assembly 30 on the fine printing trolley is obtained by the CCD spray head positioning system 4.
In this embodiment, the quantity of dolly 3 is printed in the inkjet sets up to two sets ofly be mutually independent mode, its reciprocating motion that combines workstation 2, carries out the inkjet printing of hindering the solder mask on the PCB board, has effectively promoted printing efficiency, has guaranteed the printing effect.
In the embodiment, the precision requirement of solder mask printing is ensured by the fine printing trolley, and the printing trolley is filled with large amount of ink to fill the area so as to meet the thickness requirement, so that the precision and the thickness in the solder mask printing are considered at the same time.
For the existing PCB solder mask process, the solder mask bridge is also called green oil bridge and solder mask dam, which is a factory batch paster, and is an isolation zone for preventing SMD component pins from short circuit, namely a solder mask bridge area 24 in figure 5, and the width of the minimum solder mask bridge is as small as 200 micrometers; the solder mask window refers to the size of the part where copper is exposed at the position to be welded, i.e. the size of the part without covering ink, as shown in fig. 5, a solder mask window area 22 is defined by the solder mask window, and the inside surrounded by the solder mask window is a copper pad area 21; the width of solder resist oil reserved between the two solder resist windows is generally larger than 150 microns, and the minimum edge-to-edge distance of the copper solder pad is required to be 0.05-0.2 mm.
The fine printing trolley is arranged in the embodiment, and the CCD sprayer positioning system 4 is used, so that the precision requirement in the PCB solder mask process can be reliably met.
In one-time reciprocating printing of the PCB along with the workbench 2, the fine printing trolley repeatedly performs printing of the outer frame of the solder mask windowing area 22 and the solder mask bridge area 24, so that the printing thickness is increased, and damming is completed; in one-time reciprocating printing of the PCB along with the workbench 2, the large-ink-volume filling printing trolley repeatedly performs filling printing of the solder resist green oil area 23, so that the printing thickness in the solder resist green oil area 23 is increased to finish printing of a solder resist ink layer; thereby meeting the solder resist printing requirements in terms of precision and thickness.
Generally, in the solder resist ink jet printing process, the workbench 2 only needs to complete one-time reciprocating movement, and damming can be completed after the fine printing trolley performs two-time printing; after the workbench 2 moves back and forth twice, the filling printing required by the thickness of 40 microns of the solder resist layer can be completed in four times of printing of the large-ink-volume filling printing trolley.
In the embodiment, furthermore, the fine printing trolley adopts an ultrahigh-precision internal circulation spray head with the minimum ink drop of 2.4 picoliters, and the ultrahigh-precision internal circulation spray head has the original resolution of 1200dpi so as to ensure the ultrahigh-precision requirements of a solder mask windowing window and a solder mask bridge +/-10 microns and can achieve the reliable and stable printing of the solder mask bridge with the width of as small as 75 microns; and the large ink volume filling printing trolley adopts an external circulation spray head with the minimum ink drop of 13 picoliters, has the original resolution of 360dpi, and is suitable for filling a solder mask layer with large ink volume.
Of course, in the printing process of the fine printing carriage or the large ink filling printing carriage, the work of the lamp group 9 carried by each needs to be matched.
Further, two groups of ink jet printing trolleys 3 are arranged on a main beam 5 in a back-to-back manner, the main beam 5 stretches across the X-direction guide rail assembly 1, the fine printing trolley is movably arranged on the front side surface of the main beam 5 through the first Y-direction rail assembly 51, and the large ink volume filling printing trolley is movably arranged on the rear side surface of the main beam 5 through the second Y-direction rail assembly 52; the CCD target positioning system comprises a main beam 5 and two sets of CCD target positioning systems 6, and is characterized by further comprising auxiliary beams 8 arranged behind the main beam 5 in parallel at intervals, wherein a third Y-direction track assembly 53 is installed on the side face of each auxiliary beam 8, and the two sets of CCD target positioning systems 6 respectively move in the Y direction along the third Y-direction track assembly 53.
In another embodiment shown in fig. 1, the work table 2 is provided with two sets operating independently, a single set of work tables 2 moving in the X direction along the corresponding X guide rail assembly 1; the two groups of work tables 2 respectively bear the PCB and alternately move to the CCD target positioning system 6 for actual size grabbing or move to the ink-jet printing trolley 3 for printing, so that the ink-jet printing trolley 3 continuously works in combination with movement along the Y direction, the production time is further shortened, and the printing efficiency is improved.
In the ink-jet printing of digital characters, when one workbench 2 is in the printing process, the other workbench 2 can be in the assembling and disassembling processes of a PCB and the aligning process of a CCD target positioning system 6, and the two workbenches 2 can be simultaneously carried out, so that the labor is saved, the working efficiency is improved, and the utilization rate of the ink-jet printing trolley 3 is maximally improved; in the solder resist ink jet printing process, the printing tasks can be staggered, the printing efficiency is improved through the arrangement of the two work tables 2, and the utilization rate of the ink jet printing trolley 3 is improved.
In the embodiment shown in fig. 2 and 3, the worktable 2 is slidably mounted on the X-direction guide rail assembly 1 through a wedge elevating platform 7, the wedge elevating platform 7 drives the worktable 2 to move up and down, and the distance between the PCB on the top surface of the worktable 2 and the upper nozzle assembly 30 is adjusted;
further, in the embodiment shown in fig. 6, the cam lifter 7 includes an upper cam seat 76 and a lower cam seat 74 having upper and lower inclined surfaces matching with each other, and the motor 77 drives the lower cam seat 74 to move in the horizontal plane guided by the translation guide assembly 72, so as to drive the upper cam seat 76 to move in the height direction guided by the longitudinal movement guide assembly 73, thereby adjusting the height of the worktable 2.
In practical use, the base 71 at the bottom of the wedge lifting table 7 is slidably assembled on the X-direction guide rail assembly 1, the lower wedge seat 74 is slidably assembled on the base 71 through the translation guide assembly 72, the inclined surface at the bottom surface of the upper wedge seat 76 is slidably assembled on the inclined surface at the top surface of the lower wedge seat 74 through the inclined guide assembly 75, and the inclined surface at the bottom surface of the upper wedge seat 76 and the inclined surface at the bottom surface of the lower wedge seat 74 are parallel to each other; meanwhile, the upper wedge seat 76 is also in sliding fit with the base 71 through the longitudinal movement guide assembly 73; therefore, when the lower wedge seat 74 is driven by the motor 77 to move in the horizontal direction relative to the base 71 through the translation guide assembly 72, the upper wedge seat 76 is driven to move downwards through synchronous guiding of the inclination guide assembly 75 and the longitudinal movement guide assembly 73 to realize up-and-down movement, so that the workbench 2 arranged on the top surface of the upper wedge seat 76 realizes lifting adjustment, the distance between a PCB (printed circuit board) on the top surface of the workbench 2 and the spray head assembly 30 of the upper inkjet printing trolley 3 is adjusted, and the assistance is realized to keep the printing distance constant.
Through the arrangement of the wedge lifting platform 7 below the workbench 2, the ink-jet printing trolley 3 only moves along the Y direction, and the adjustment of the distance between the ink-jet printing trolley 3 and a PCB below the ink-jet printing trolley is realized by the workbench 2, so that various problems caused by the up-and-down movement of the existing ink-jet printing trolley 3 are effectively solved; and the workbench 2 is moved up and down by the wedge lifting table 7, so that the moving precision, stability and reliability are effectively ensured.
In this embodiment, the lifting adjustment of the wedge lifting table 7 can be applied to the printing adjustment of the PCB board within the thickness range of 1-8 mm.
In the embodiment shown in fig. 2 and 3, the X-direction rail assembly 1 is mounted on a marble base 11, and the marble base 11 is mounted on a double-layered anti-vibration chassis 10.
In this embodiment, the double-layer shockproof chassis 10 is formed by welding double-layer thick-wall square tubes, the weight of the machine is uniformly dispersed on the chassis through the double-layer chassis, and the shock generated during the operation of the machine is effectively consumed and absorbed by the ground feet and the damping rubber in the double-layer chassis structure.
In the invention, the actual positions of the PCB and the spray head assembly 30 during printing are effectively and reliably ensured by the CCD target spot positioning system 6 and the CCD spray head positioning system 4, so that the printing positioning precision is high, the method can be suitable for the accurate printing of industrial-grade variable data two-dimensional codes, and the method helps to replace the conventional laser technology; meanwhile, two groups of different ink-jet printing trolleys are combined, so that the method is also suitable for solder resist ink-jet printing, and the matching of dual requirements on precision and thickness is effectively realized.
In the invention, the ink-jet printing efficiency of the PCB digital characters can reach more than 8 pieces/min through the continuous printing of the ink-jet printing trolley 3 in the reciprocating movement of the workbench 2, and the last procedure of the PCB can be effectively matched, thereby avoiding the personnel circulation among the procedures and greatly saving the manpower.
The invention can print in the reciprocating motion of the workbench, and can complete the ink-jet printing of the digital characters on the PCB in one reciprocating motion, thereby greatly improving the production efficiency, realizing the effect of doubling the production speed and saving the production cost; the printing method is particularly suitable for the PCB solder mask ink jet printing, can efficiently take into account two aspects of precision and thickness, and effectively ensures the solder mask printing effect.
The above description is intended to be illustrative and not restrictive, and the scope of the invention is defined by the appended claims, which may be modified in any manner within the scope of the invention.
Claims (10)
1. An inkjet printing method for PCB printing, characterized in that: the ink-jet printer comprises a workbench (2) moving along the length direction of the X-direction guide rail component (1), an ink-jet printing trolley (3) arranged above the workbench (2) and two groups of CCD target positioning systems (6); the single group of CCD target positioning system (6) and the ink-jet printing trolley (3) move along the Y direction respectively;
the printing method includes the steps of:
the workbench (2) holding the PCB moves along the X positive direction, and the actual size of the PCB is grabbed by combining two sets of CCD target positioning systems (6);
the workbench (2) moves to a forward printing starting position along the X direction, and the ink-jet printing trolley (3) moves to the position above the corresponding PCB along the Y direction;
when the forward printing is started, the ink-jet printing trolley (3) is static and jets ink towards the PCB through the lower spray head assembly (30), and the PCB moves in an accelerating manner along the positive X direction along with the workbench (2) until the forward printing is finished; the workbench (2) is positioned at a reverse printing initial position, reverse printing is started, the ink-jet printing trolley (3) is static and jets ink towards the PCB through the lower sprayer component (30), and the PCB moves in an accelerating manner along the workbench (2) along the X reverse direction until the reverse printing is finished;
and finishing one-time reciprocating printing of the PCB after the reverse printing is finished.
2. A method of inkjet printing of PCB printing as claimed in claim 1 wherein: the bottom surface of the ink-jet printing trolley (3) is also provided with a lamp group (9), the lamp group (9) provides curing energy for the forward printing and reverse printing processes, and the curing energy required in the reverse printing is higher than that required in the forward printing.
3. A method of inkjet printing of PCB printing as claimed in claim 2 wherein: the lamp group (9) comprises a first UV lamp (91) arranged in front of the spray head assembly (30) and a second UV lamp (92) arranged behind the spray head assembly (30); in the forward printing process, a first UV lamp (91) in front is turned on; during the reverse printing process, the first UV lamp (91) and the second UV lamp (92) are both lighted.
4. A method of inkjet printing of PCB printing as claimed in claim 3 wherein: the energy of the UV lamp I (91) during the lamp-on work is 250mj/cm 2 -350mj/cm 2 (ii) a The total energy of the first UV lamp (91) and the second UV lamp (92) is 600mj/cm when the lamps are on 2 -800mj/cm 2 。
5. A method of inkjet printing of PCB printing as claimed in claim 1 wherein: the ink-jet printing trolley (3) and the two sets of CCD target positioning systems (6) are arranged on the main beam (5) in a back-to-back mode, the main beam (5) stretches across the X-direction track assembly (1), the ink-jet printing trolley (3) is movably arranged on the front side face of the main beam (5) through the Y-direction track assembly I (51), the Y-direction track assembly II (52) is arranged on the rear side face of the main beam (5), and the two sets of CCD target positioning systems (6) respectively move in the Y direction along the Y-direction track assembly II (52); a CCD (charge coupled device) spray head positioning system (4) moving together is fixedly installed on the ink-jet printing trolley (3), and the actual position of the spray head assembly (30) on the ink-jet printing trolley (3) is obtained by the CCD spray head positioning system (4).
6. A method of inkjet printing of PCB printing as claimed in claim 1 wherein: the ink-jet printing trolley (3) comprises two groups which independently move along the Y direction and are respectively a fine printing trolley and a large-ink-volume filling printing trolley; the fine printing trolley prints an outer frame of a solder mask windowing area (22) and a solder mask bridge area (24) on the PCB, and then the printing trolley is filled with large amount of ink to perform filling printing of a solder mask green oil area (23) on the PCB; the minimum ink drop value of the fine printing trolley is smaller than the minimum ink drop value of the large-ink-volume filling printing trolley, and the original resolution of the fine printing trolley is larger than the original resolution of the large-ink-volume filling printing trolley; and a CCD (charge coupled device) spray head positioning system (4) which moves together is fixedly arranged on the fine printing trolley, and the CCD spray head positioning system (4) acquires the actual position of the spray head assembly (30) on the fine printing trolley.
7. The inkjet printing method of PCB printing according to claim 6, wherein: in one-time reciprocating printing of the PCB along with the workbench (2), the fine printing trolley repeatedly performs printing of an outer frame of the solder mask windowing area (22) and the solder mask bridge area (24), so that the printing thickness is increased; in one-time reciprocating printing of the PCB along with the workbench (2), the large-ink-volume filling printing trolley repeatedly performs filling printing of the solder resist green oil area (23), so that the printing thickness in the solder resist green oil area (23) is increased.
8. The inkjet printing method of PCB printing according to claim 6, wherein: two groups of ink-jet printing trolleys (3) are arranged on a main beam (5) in a back-to-back manner, the main beam (5) stretches across the X-direction track assembly (1), the front side surface of the main beam (5) is movably provided with a fine printing trolley through a Y-direction track assembly I (51), and the rear side surface of the main beam (5) is movably provided with a large-ink-volume filling printing trolley through a Y-direction track assembly II (52); the CCD target positioning system is characterized by further comprising an auxiliary cross beam (8) which is arranged behind the main cross beam (5) in parallel at intervals, a Y-direction track assembly III (53) is installed on the side face of the auxiliary cross beam (8), and the two sets of CCD target positioning systems (6) respectively move in the Y direction along the Y-direction track assembly III (53).
9. A method of inkjet printing of PCB printing as claimed in claim 1 wherein: the workbench (2) is provided with two groups which independently run, and the single group of workbench (2) moves along the corresponding X-direction guide rail assembly (1) in the X direction; the two groups of work tables (2) respectively bear the PCB and alternately run to the CCD target positioning system (6) for actual size grabbing or run to the ink-jet printing trolley (3) for printing, so that the ink-jet printing trolley (3) continuously works in combination with movement along the Y direction.
10. A method of inkjet printing of PCB printing as claimed in claim 1 wherein: the workbench (2) is slidably mounted on the X-direction guide rail assembly (1) through a wedge lifting platform (7), the wedge lifting platform (7) drives the workbench (2) to move up and down, and the distance between a PCB (printed circuit board) on the top surface of the workbench (2) and the upper sprayer assembly (30) is adjusted; the X-direction guide rail assembly (1) is installed on a marble base (11), and the marble base (11) is installed on a double-layer shockproof underframe (10).
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| CN202211383355.4A CN115503366A (en) | 2022-11-07 | 2022-11-07 | Ink jet printing method for PCB printing |
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| CN202211383355.4A CN115503366A (en) | 2022-11-07 | 2022-11-07 | Ink jet printing method for PCB printing |
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