⚙️ Thread Comb Machine

CGK-18 NC Electrode Thread Comb Processing Machine

A full CNC machine for single-end combing of internal taper threads on graphite electrodes. Precision AC servo drives, a purpose-built CNC control and a rigid mechanical structure hold pitch error within ±0.015 mm across the Φ150–Φ550 mm electrode range.

Request a Quote Technical Specs ↓

Φ150–Φ550 mm

Electrode Diameter

±0.015 mm

Single Pitch Error

4 kW

Main Motor

5.5 t

Machine Weight

Single-End Combing for Furnace-Grade Electrodes

The CGK-18 machines the internal taper thread that joins graphite electrode sections into a high-current furnace column.

CGK-18 NC electrode thread comb processing machine in a production plant

The internal taper thread of a graphite electrode carries the full furnace current across a joint smaller than the electrode body. The CGK-18 is a full CNC internal-cone thread-combing machine that cuts that thread in a single setup, with length floating positioning, automatic or manual end-face scraping, pneumatic workpiece clamping and automatic centering support. A purpose-built CNC control coordinates every axis, removing mechanical transmission-chain error from the thread profile and taper.

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Key Features & Working Principle

Six capabilities that let one machine deliver the thread quality a furnace joint demands.

1️⃣

Full CNC Internal Thread Combing

The comb tool machines the electrode's internal taper thread under full CNC control, eliminating mechanical cam or template error from the thread geometry.

2️⃣

Purpose-Built Control System

A dedicated CNC system and software coordinate servo motion specifically for electrode thread combing, with stored part profiles for fast changeover.

3️⃣

Precision AC Servo Drives

Every motion axis is driven by precision AC servo motors, giving accurate interpolation and repeatable positioning for thread pitch and taper.

4️⃣

Length Floating Positioning

A floating length-reference system compensates for blank-length variation so the thread starts from the correct end-face position every cycle.

5️⃣

Automatic End-Face Scraping

The end face can be scraped automatically or manually to create a clean, square seating surface before the thread is cut.

6️⃣

Pneumatic Clamping & Centering

Pneumatic workpiece clamping and automatic centering support hold the electrode on the machine axis without manual alignment.

Why Choose the CGK-18

Against mechanical or semi-CNC thread comb machines, the CGK-18 wins on accuracy, repeatability and electrode range.

🎯

Furnace-Joint Pitch Accuracy

Single-thread pitch error within ±0.015 mm and cumulative error ≤0.06 mm per 150 mm keep electrode joints from running hot in service.

🏆

Square Thread Centerline

Thread centerline-to-end-face perpendicularity ≤0.015 mm and end-face flatness ≤0.03 mm give full, even contact across the joint.

⚙️

Wide Electrode Range

One machine covers Φ150–Φ550 mm electrode diameters and 1300–2600 mm lengths, so a single shop serves multiple furnace grades.

📐

Repeatable from First Piece to Last

CNC tool paths and digital offsets remove operator-dependent variability across a production shift.

🛡️

Rigid, Vibration-Damped Bed

The 5.5 tonne machine bed absorbs combing forces, protecting surface finish and extending tool life in abrasive graphite.

💰

Lower Cost per Electrode

One setup, automatic centering and stored part programs cut handling time and rework compared to manual or mechanical methods.

CGK-18 — Technical Data

Main technical performance indicators from the factory datasheet.

Parameter	Unit	CGK-18
Model	—	CGK-18
Machined electrode diameter	mm	Φ150–Φ550
Machined electrode length	mm	1300–2600
Main motor power	kW	4
Spindle speed	rpm	0–20 stepless
Single-thread pitch error	mm	±0.015
Cumulative thread pitch error	mm	≤0.06/150
Thread centerline-to-end-face perpendicularity	mm	≤0.015
End-face flatness	mm	≤0.03
Machine weight	t	5.5

Materials & Industries Served

Designed for carbon plants machining the internal taper threads that connect graphite electrode columns in high-current furnace operations.

🔩

Graphite Electrode Body Threading

Φ150–Φ550 · 1300–2600 mm

⚡

UHP / HP / RP Electrodes

High-current furnace connections

🏭

Electrode Manufacturing Plants

Body thread finishing lines

🔥

Electric Arc Furnace Steelmaking

EAF · Ladle furnace electrodes

🔄

Mixed-Spec Electrode Production

Program-call changeover

📏

Thread Repair & Reconditioning

Re-cut worn electrode sockets

Frequently Asked Questions

What is an electrode thread comb processing machine?

It is a dedicated CNC machine that cuts the internal taper thread of a graphite electrode using a comb-style tool. The CGK-18 performs single-end combing with floating length positioning, end-face scraping and automatic centering, all under full CNC control.

What electrode sizes can the CGK-18 process?

The CGK-18 machines graphite electrodes with diameters from Φ150 mm to Φ550 mm and lengths from 1300 mm to 2600 mm. Different sizes are handled by loading the corresponding part program and adjusting fixturing.

What thread accuracy does the CGK-18 achieve?

The machine holds single-thread pitch error within ±0.015 mm, cumulative pitch error ≤0.06 mm per 150 mm, thread centerline-to-end-face perpendicularity ≤0.015 mm, and end-face flatness ≤0.03 mm. These tolerances control joint contact area and current-carrying capacity.

How does the floating length positioning work?

A floating reference system measures the electrode blank length and lets the CNC offset the thread start position so the thread depth and end-face relationship remain correct even when incoming blanks vary slightly in length.

What control system does the CGK-18 use?

All motion axes are driven by a purpose-built CNC system with program-stored part profiles and precision AC servo drives. Full digital control removes mechanical transmission-chain error from the thread geometry.

What information is needed for a quotation?

Send us your electrode diameter and length range, thread standard and taper ratio, pitch, electrode grade, daily production target, and workshop layout including power supply and foundation requirements. Our engineering team returns a machine configuration with confirmed specifications and a quotation.

Configure a CGK-18 for Your Electrode Production

Send us your electrode diameter and length range, thread standard, taper ratio, pitch, electrode grade, daily throughput target, and workshop layout — including power supply and foundation requirements. Our engineering team will prepare a machine configuration with confirmed specifications and a quotation.