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Fully Automatic CNC Grinding Machine For Stainless Steel Tubular Door Handle
Fully automatic CNC grinding machine purpose-built for stainless steel tubular door handles — removes weld lines, scratches and die marks from 304/316 tube with constant-pressure feed, indexing rotation and inline auto loading. Consistent satin finish across the full batch, run after run.
The Tubular Handle Finishing Challenge
Thin-wall deflection: A 22 mm * 1.2 mm tube has almost no stiffness. Under grinding pressure it bows, and the wheel takes more material off the center than the ends — the classic "banana" profile defect.
Weld lines and die marks: Formed handles carry longitudinal weld seams and roll-in marks that must be removed without cutting a flat spot into the round section.
Consistency is impossible by hand: Three operators, three finishes. Rejects and rework eat the margin that automation was supposed to protect.
Bent sections and bow handles: Radius sections change the grinding contact angle continuously — a fixed spindle simply cannot follow the shape.
The Solution
The LR-GRIND-T is a fully automatic, two-station CNC grinding cell engineered specifically for round and bent stainless steel tubular workpieces:
Automated Process Flow: 1. Auto Loading → 2. Constant-Pressure Grinding → 3. Indexing Rotation → 4. Auto Unloading → 5. Finished-Batch Stacking
Every handle passes the same cycle with the same grinding force and the same wheel speed — so the finish you approve on the first sample is the finish you get on the 10,000th piece.
Key Features & Benefits
Precision & Repeatability
Constant-pressure grinding head: Servo-controlled contact force keeps removal depth identical across the full tube length and across the whole batch — eliminates the "banana" deflection profile.
Indexing rotation (servo CSS): The tube rotates under the grinding belt/wheel in indexed increments, guaranteeing uniform circumferential coverage on round sections.
Programmed multi-pass cycles: Roughing → pre-finish → satin finish, each pass with its own force, speed and feed, stored as a one-touch recipe.
Automation & Labor Efficiency
Inline auto loading: Bar magazine / bowl feeder feeds handles directly to the grinding station — no operator handling from raw tube to finished stack.
One-button recipe change: Switch between handle lengths, tube diameters and finish grades in under [TBC] minutes with quick-change tooling.
Unattended operation: 3-shift capable; the machine runs through breaks, breaks-even on labor within the first [TBC] months on a 2-shift plant.
Force Control & Adaptability
Curved-section following: For bow and D-shaped handles, the multi-axis path keeps the contact wheel normal to the tube surface through the radius — no flat spots, no burning.
Weld-line priority cycle: Dedicated first-pass strategy removes the longitudinal weld seam before finish passes, protecting belt life and surface quality.
Material-smart presets: 304 and 316 behave differently under the wheel — dedicated force/feed recipes for each grade prevent over-grinding and heat tint.
Quality & Traceability
Recipe-controlled output: Every batch runs the exact same program — finish is a process property, not an operator's mood.
Optional in-line surface check: [TBC] (flags out-of-spec parts before they reach packaging.
PPAP-ready documentation: Full parameter log per batch supports automotive-tier door hardware customers who demand data.
Durability & Reliability
Stainless-proof guarding: Wash-down-friendly enclosure for the wet/fine-dust environment of tube grinding.
Heavy-duty spindle & guide rails: Designed for continuous 3-shift duty, not prototype-shop duty.
Low-maintenance dust extraction port: Integrated [TBC] mm extraction interface keeps the cell clean and the belts cutting.
Frequently Asked Questions
Q1. How do you prevent deformation when grinding slender tubes?
This is a primary challenge in grinding tubular workpieces. The LR-GRIND-T utilizes a servo-controlled constant-pressure grinding head—ensuring grinding force remains steady regardless of tube length—combined with a center support system to eliminate the "banana-shaped" defect (over-grinding in the middle) common in traditional methods. Pressure values are programmed based on tube diameter and wall thickness, with specific recipes for 304 and 316 stainless steel.
Q2. Can door handles with bends or arched shapes be ground?
Yes. Multi-axis coordination keeps the contact wheel perpendicular to the tube surface throughout the bend, preventing flat spots or burn marks at the corners. Dedicated path programs are available for D-shaped and arched handles within the supported geometric range.
Q3. How are weld seams and mold marks handled?
The program includes a built-in "weld-first" initial step: a coarse grinding pass removes the longitudinal weld seam before pre-grinding and finish grinding. This preserves abrasive belt life and prevents surface defects caused by residual weld material.
Q4. How long does it take to switch specifications (different lengths, diameters, or finishes)?
Thanks to quick-change tooling and one-touch recipe recall, standard changeovers are completed within [TBC] minutes. The recipe library stores [TBC] programs, allowing for seamless switching between combinations of length, diameter, and finish grade without the need for re-calibration.
Q5. Does the machine produce a brushed or mirror finish?
The standard configuration produces a brushed/satin (hairline) finish, meeting mainstream market demands for door handles. A mirror finish can be achieved by adding an independent polishing station (see optional features). Finish grades are managed as recipe parameters, ensuring consistency across the batch.
Q6. How many operators are required per machine?
With automatic loading and unloading, a single operator can oversee multiple machines. The standard setup eliminates the need for manual handling—raw materials are fed from a hopper, and finished products are automatically palletized.
Q7. Does it support unmanned operation?
Yes. The fully enclosed unit and automatic loading/unloading system support continuous three-shift operation; the magazine capacity is designed to match per-shift output ([TBC] pcs/magazine), enabling unattended operation during the night shift.
Q8. What are the workshop requirements?
Standard industrial 380V/[TBC]V power supply, [TBC] bar compressed air, and a [TBC] mm dust collection port. It occupies an area of [TBC] * [TBC] m and can replace manual workstations in existing grinding workshops.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer
Year Established:
2010
Total Annual:
150000-1000000
Employee Number:
80~105
Ecer Certification：
Verified Supplier
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