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なぜ真空ろう付けなのか?

真空ろう付けは、ダイヤモンド工具の接合に非常に有効な方法であり、いくつかの理由から従来のはんだ付け方法よりも好まれます。まず真空ろう付けでは、ダイヤモンド、PCD,PCBNなどの素材が濡れにくい高強度の接合部を形成します。その結果、ダイヤモンドと工具本体がより確実に接合され、工具の寿命と耐久性の向上につながります。

第二に、真空ろう付けのプロセスは、フラックスやその他の化学物質を使用する必要が無いため、非常にクリーンで環境に優しいという事です。特にダイヤモンド工具は、はんだ付けの際に不純物があると、その性能に悪影響を及ぼすため、この点は重要です。

第三に、真空ろう付けの際、全ての部品に一定の均一な温度分布が生じる為、加熱とその後の冷却によって生じる部品の残留応力を回避することが出来ます。これにより、ダイヤモンド工具の熱的・機械的特性を維持することができ、場合によって改善することも可能です。

最後に、真空ろう付けでは、輻射熱によりすべてのワークが同じろう付け温度にさらされるため、一度のろう付け工程で複数のろう付け箇所を持つ複数の部品を同時に接合する事が可能です。そのため、効率が上がり、生産時間が短縮されるため、ダイヤモンド工具メーカーにとって費用対効果の高い選択肢となります。

Technical Data

CPE Power 380V 3P 4 wires or 480V 3P 3 wires
CDA Ø8 mm, 5 ~ 7 kg/cm2
Cooling Water 40 L/min, 19200 BTU/hr
Specification Control System
PLC One touch control integrated 10 programming recipes
HMI 9”
Vacuum Chamber
Quartz Chamber Quartz inner Ø 150 mm
Quartz plate 285 x 140 mm
H75 mm Max
Heating System
Heating Lamp 2 kw x 12 = 24 kw
Heating Rate 800 ℃ /min
Accuracy ±3 ℃
Maximum Operating Temperature 950 ℃
Vacuum System
High Vacuum Pump 1100 L/sec, cold trap, ultra-high vacuum valve
Rotary Pump 670 L/min
Ultimate Vacuum Pressure 20 min < 9x10-6 torr
Pumping Speed 5 min < 5x10-5 torr
Dimension
Main Frame 1400L x 880W x 1670H mm

Options:

  • HMI multilanguage support
  • Datalog collection
  • Remote control and remote access
  • Product traceability

ろう付けの手順

STEP 1

After ultrasonic cleaning, put on paste

STEP 2

Set diamond tip on the shank

STEP 3

Dry the workpiece in the drying oven

Temperature : 100 ℃ ~ 120 ℃
Time : 10~20 min approximately
Atmosphere : Air

STEP 4

Shave extended paste off while necessary

STEP 5

Put into the high speed vacuum brazing machine

STEP 6

Complete brazing

高速真空ブレージングと従来のブレージングの比較

High Speed Vacuum Brazing Conventional Brazing
Usage Brazing Natural diamond, CVD, PCD, PCBN and related materials on to tool body Some limitations on substrate materials due to thermal coefficient
Brazing Temperature Available up to 900 ℃ Limit up to 750 ℃
Applicable Material
  • PCD, PCBN, tungsten carbide: low temperature brazing
  • PCBN, CVD, CBN, mono crystal diamond, natural diamond: high temperature brazing
Only PCD and PCBN: low temperature
Capacity Around 80pcs per hour, depending on the tool size Max. 20pcs per hour
Brazing Quality Automatic process, consistent quality and complete repeatability Manual process, quality depending on worker’s skill level
Additional Benefit
  • Additional Benefit
  • No need for experienced labor. Operator can perform other jobs while machine is running
  • Lower production cost
  • No dangerous fume inhalation
  • Need flux and extra cleaning
  • Need experienced labor
  • Dangerous fumes
  • No more variables of manual brazing, be free from labors’ skill
  • Guaranteed consistent brazing quality and tip retention
  • Protects PCD/ PCBN/ CVD/ diamonds from oxidation and reduces graphitization
  • 1 Machine = for all types of superabrasive cutting tool products
  • Improves your brazing capacity and quality

ISOインサートの高周波ろう付け、トーチろう付けとの比較

High Speed Vacuum Brazing Induction or Torch Brazing
Brazing Temperature Available up to 900 ℃ Below 750 ℃
Diamond Type
  • PCD, PCBN
  • CVD, CBN, mono crystal diamond, natural diamond
Only PCD and PCBN
Brazing Alloy Liquid metal (paste): higher melting point (stable at high temperature machining) Silver alloy : melting point between 600~700 ℃
Capacity 1
(ISO inserts)
40~150pcs per hour depending on the insert size. The smaller the tool, the more you can braze
  • Brazing one by one
  • Manual process
  • 15~20pcs per hour
Capacity 2
(reamers, PCD tipped drills)
10~30pcs per hour depending on size of drill and PCD tip
  • 5pcs max (longer time due to cleaning, sanding, etc)
  • Graphitizes PCD
Flux Cleaning No flux, no need cleaning before and after brazing
  • Cleaning before and after brazing
  • Sanding after brazing
Fixing No need fixing. One time braze due to capillary action Fixing is necessary. Operator must maintain pressure. Possible re-heating necessary

ISOインサートの真空炉ろう付けとの比較

High Speed Vacuum Brazing Vacuum Furnace Brazing
Cycle time 1.5 hours 8~10 hours
Precision No movement of tips because of rapid heating and cooling Tips are moving at some cases due to long process time

リーマ(4枚刃以上)用高周波ろう付けとの比較

High Speed Vacuum Brazing Induction Brazing
Brazing Speed No difference for more edges Longer time for more edges
Staff 1 entry-level worker can perform other jobs while machine is running At least 1 dedicated experienced worker
Brazing Quality and Yield Rate Automatic process with one simple touch, consistent good quality and yield rate, even for more edges Manual process, quality and yield rate depending on worker’s skill level and will become worse if more edges