IPC-TM-650 EN 2022 试验方法.pdf - 第246页

1 Scope This test method specifies techniques for the determination of machineability of a solder mask. 2 Applicable Documents IPC-SM-840 Qualification and Performance of Permanent Solder Mask IPC-A-25A-G-KIT 1 Multipurp…

Scope

This

method is designated for use in determining

the ease of machining of plastic materials and the effect of

such machining on the cutting tools and plastic.

Applicable Documents

None

Test Specimen

3.1

Any

rigid printed wiring material on a finished board (con-

ventional, multilayer or flush)

Apparatus

4.1

All

typical production machine tools normally used in the

fabrication of finished printed wiring boards

Procedure

5.1 Machining

The machining must be performed by a

skilled mechanic. The technique shall be as standard as pos-

sible for all materials in order that comparisons between mate-

rials may be made.

5.2

Evaluation

After

machining (i.e., drilling, sawing, and

machining in all directions), check for cracking, splitting,

delaminating, or other adverse effects. The cutting tools

should show reasonable tendency to dull, nick, or overheat.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.4.7

Subject

Machinability,

Printed Wiring Materials

Date

7/75

Revision

Originating Task Group

N/A

Material

in this Test Methods Manual was voluntarily established by Technical Committees of the IPC. This material is advisory only

and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the use, application, or adaptation of this

material. Users are also wholly responsible for protecting themselves against all claims or liabilities for patent infringement.

Equipment referenced is for the convenience of the user and does not imply endorsement by the IPC.

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1 Scope This test method specifies techniques for the

determination of machineability of a solder mask.

2 Applicable Documents

IPC-SM-840

Qualification and Performance of Permanent

Solder Mask

IPC-A-25A-G-KIT

Multipurpose One-Sided Test Pattern

3 Test Specimens Six (6) IPC-B-25A boards coated with

solder mask on the top side. Three are to be tested

as-received and three are to be tested after solder float expo-

sure.

The IPC-A-25A-G-KIT artwork package provides the Gerber

information necessary for the fabrication of the standard IPC-

B-25A test board.

4 Apparatus and Reagents

4.1 Drill

4.1.1

Drill speed of 1500 ± 250 rpm

4.1.2 Drill bit size of 6.35 mm [0.25 in]

4.2 Router

4.2.1

Speed of 20,000 ± 5,000 rpm

4.2.2 Router bit to be standard for printed board fabrication

and operation at recommended speed. Bit must be sharp and

in good working order.

4.3 Band Saw

4.3.1

Speed of (442 ± 76) m/min [(1450 ± 250) ft/min]

4.3.2 Blade of 1.2 cm [0.5 in] width, 0.89 mm [0.035 in]

gauge, and 10-14 pitch

4.4 Punch

4.4.1

2.5 cm [1 in] square die

4.4.2 Clearance range between punch and die to be [0.001

to 0.003 in]

4.5 Permanent Marker and/or Vibrating Scribe

4.6 Hammer or Mechanical Punching Apparatus

5 Procedures

5.1 Preconditioning

5.1.1

Process three of the IPC-B-25A coupons per IPC-SM-

840, Resistance to Tin-Lead Solder - Solder Float

5.2 Drilling

5.2.1

Drill three holes in each coupon directly below the

label ‘‘B’’ on the test specimen.

5.3 Routing

5.3.1

Route a straight edge along the top side of each cou-

pon.

5.3.2 Use a permanent marker or vibrating scribe to serial-

ize each resulting piece.

5.4 Sawing

5.4.1

Make a single cut along the bottom edge of each cou-

pon removing the finger tab area.

5.4.2 Use a permanent marker or vibrating scribe to serial-

ize each resulting piece.

5.5 Punching

5.5.1

Place the punch over the fiducial above the comb pat-

tern labeled ‘‘F’’ on the test specimen.

1. www.ipc.org/onlinestore

3000 Lakeside Drive

Bannockburn, IL 60015-1249

IPC-TM-650

TEST METHODS MANUAL

Number

2.4.7.1

Subject

Solder Mask - Determination of Machineability

Date

03/07

Revision

Originating Task Group

Solder Mask Performance Task Group (5-33b)

Material in this Test Methods Manual was voluntarily established by Technical Committees of IPC. This material is advisory only

and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the use, application, or adaptation of this

material. Users are also wholly responsible for protecting themselves against all claims or liabilities for patent infringement.

Equipment referenced is for the convenience of the user and does not imply endorsement by IPC.

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ASSOCIATION CONNECTING

ELECTRONICS INDUSTRIES

5.5.2 Apply sufficient force to the punch using the appara-

tus in 4.6 to remove the section from the test specimen.

5.5.3 Use a permanent marker or vibrating scribe to serial-

ize each resulting piece.

5.6 Visual Examination

5.6.1

Visually examine each coupon and the extracted

pieces for evidence of tears or cracks of the solder mask.

6 Notes

6.1 Safety

Operator should be trained and familiar with the

hazards inherent to the chemicals being used and analyzed.

Proper personal safety equipment, such as safety glasses,

gloves and splash apron, and adequate ventilation shall be

used.

IPC-TM-650

Number

2.4.7.1

Subject

Solder Mask - Determination of Machineability

Date

03/07

Revision

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