How does a slant-bed CNC lathe machine process disc-type workpieces?

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When machining disc-type workpieces on a slant-bed CNC lathe, it’s important to consider the structural advantages and characteristics of disc-type parts. The machining process should be optimized through process design, clamping solutions, and key processes. The specific steps are as follows:

1. Process Design: Clarify the machining sequence and precision requirements.

A. Machining Sequence
a) Roughing before finishing: Rough machining is performed first to remove most stock, followed by finishing to ensure dimensional accuracy and surface roughness (e.g., Ra ≤ 1.6μm).
b) Internal machining before external machining: If the disc-type part has an internal hole, machine the internal hole first to establish a reference, then machine the external diameter and end faces.

c) Key Process Examples:
i. Rough turning the external diameter → Finish turning the external diameter → Rough turning the internal hole → Finish turning the internal hole → End face turning → Chamfering/radii → Cutting off (if separation is required). B. Precision Control
a) Unified Datum: When using the end face as the datum, the flatness requirement is ≤0.02mm; when using the inner hole as the datum, the coaxiality error must be ≤0.01mm with the end face auxiliary positioning.
b) Tool Compensation: Use the tool radius compensation function (G41/G42) to input the tool radius value and direction to correct the impact of the tool tip arc on the machining dimensions.

2. Clamping Solution: Select the appropriate fixture based on part size.

A. Small Disc Parts (Diameter ≤ 200mm)
a) Three-Jaw Self-Centering Chuck: Fast clamping, suitable for mass production.
b) Reverse Jaw Clamping: Increases the clamping diameter range, suitable for large end-face disc parts.
B. Medium-to-Large Disc Parts (Diameter > 200mm)
a) Four-Jaw Single-Action Chuck: Independently adjusts the jaw position to accommodate irregularly shaped or eccentric disc parts. b) Faceplate + Spindle: High-precision positioning, suitable for disc-like parts requiring controlled coaxiality (e.g., Morse taper No. 5 spindle, repeatability ≤ 0.005mm).
C. Special Clamping Requirements
a) Thin-walled disc-like parts: Use soft jaws or slotted sleeves to minimize clamping deformation.
b) Eccentric disc-like parts: Use scribes or a dial indicator to calibrate the eccentricity, maintaining an error within ±0.02mm.

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Lisa Du

As a sales representative with more than ten years of CNC machine tool sales experience, I rely on my profound knowledge and experience to select the most suitable machine tools for customers based on their specific needs to facilitate efficient production. In the field of CNC machine tools, I always uphold professionalism and integrity and am committed to providing customers with excellent services.

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