Big Daishowa BT50-LCZ56T-195

Product Brief Introduction

High-precision BT50 taper hydraulic expansion tool holder designed for high-speed CNC milling and boring machining operations; utilizes hydraulic oil pressure to uniformly clamp cutting tool shanks for ultra-low runout precision.
Category:
Description

Technical Specifications

  1. Machine Taper Standard: BT50 Japanese industrial machine tool taper specification
  2. Hydraulic Chuck Clamping Diameter Range: 56mm nominal tool shank compatible diameter
  3. Overall Projection Length: 195mm from taper gauge line to chuck front face
  4. Maximum Safe Spindle Rotational Speed: 12,000 RPM balanced G2.5 grade dynamic balance
  5. Radial Runout Accuracy at 3x tool diameter: ≤ 0.001 mm precision tolerance
  6. Hydraulic Clamping Mechanism: Internal sealed oil pressure expansion sleeve
  7. Coolant Through Tool Compatibility: Internal central coolant bore passage
  8. Material Hardness: HRC 58–62 full body heat treatment hardness

Functional Features

  • Uniform hydraulic radial clamping force eliminates uneven tool shank deformation during high-speed rotation
  • Ultra-low radial runout maintains micron-level machining dimensional accuracy
  • Central through-coolant channel delivers high-pressure cutting fluid directly to cutting edge
  • Single-sided hydraulic actuation screw for rapid tool exchange without specialized clamping equipment
  • High dynamic balance grade eliminates spindle vibration at maximum rated rotational speed

Structural Characteristics

  • Integrated BT50 solid taper shank monolithic forged construction
  • Mid-body hydraulic expansion sleeve encapsulated sealed oil chamber
  • Front cylindrical chuck bore for straight tool shank insertion
  • Side hydraulic pressure adjustment actuation screw for clamp/release operation
  • Central axial through-hole for high-pressure coolant fluid transport

Material Composition

  • Base body blank: Chromium-molybdenum alloy steel 42CrMo4
  • Hydraulic expansion sleeve: High elastic alloy spring steel
  • Sealing media: High temperature resistant nitrile hydraulic oil seals
  • Internal hydraulic fluid: Anti-wear low-viscosity mineral hydraulic oil
  • Surface coating: Black oxidation anti-corrosion wear resistant surface treatment

Working Principle

Insert straight shank cutting tool into front hydraulic chuck bore; rotate side actuation screw to compress internal sealed hydraulic oil chamber; incompressible hydraulic oil distributes uniform radial pressure to elastic expansion sleeve; sleeve contracts inward to fully grip tool shank across full contact surface; uniform clamping force eliminates point-contact runout error; reverse rotation of actuation screw releases hydraulic pressure, allowing free tool removal; central coolant bore routes machine spindle high-pressure cutting fluid through tool holder to cutting tool tip for continuous cooling and chip evacuation during material removal cycles.

Advantage Highlights

  • Micron-grade radial runout tolerance delivers superior surface finish precision for mold and die machining
  • Hydraulic clamping eliminates tool slippage under heavy interrupted milling cutting loads
  • G2.5 factory pre-balanced construction prevents spindle chatter at high RPM machining
  • Long 195mm projection length accommodates deep cavity mold machining without custom extension adapters
  • Monolithic forged BT50 taper eliminates assembly tolerance stack-up error compared to modular tool holders

Applicable Industries

Precision mold & die CNC machining, automotive engine component milling, aerospace alloy part boring, medical implant precision machining, semiconductor mold fabrication

Installation Requirements

  1. Clean BT50 spindle taper surface and tool holder taper with lint-free solvent wipe prior mounting
  2. Mount holder fully seated into CNC machine BT50 spindle drawbar assembly
  3. Insert straight shank cutting tool fully into chuck bore before applying hydraulic clamping pressure
  4. Perform radial runout verification with dial indicator post tool exchange operation
  5. Calibrate machine spindle dynamic balance offset if utilizing custom heavy cutting tools

Usage Precautions

  • Do not exceed maximum rated spindle speed 12,000 RPM during continuous machining cycles
  • Remove all metal chip debris from chuck bore before inserting new cutting tool shanks
  • Avoid over-tightening hydraulic actuation screw to prevent permanent expansion sleeve deformation
  • Refill internal hydraulic oil chamber every 12 months of continuous production machining use
  • Prevent direct collision between chuck front face and workpiece fixture during rapid machine axis movement
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