Views: 0 Author: Site Editor Publish Time: 2026-09-21 Origin: Site
Service teams working in mines, engineering machinery, shipyards, and hydropower sites frequently encounter three types of difficult-to-take-on jobs:
The rear axle hinge points of mining trucks, with diameters of φ200—400mm and 3-4 holes arranged in a straight line, require in-situ boring to maintain roundness and coaxiality. With only a portable machine with a φ60 boring bar, the deflection of the long bar when passing through the hole group will cause the roundness to drift from 0.03mm to over 0.05mm.
The bucket rod ear holes of electric shovels (φ300—600mm) and the bearing holes of crusher frames (φ150—400mm) have 3mm single-side surfacing on cast steel parts, which generates fierce cutting reaction force. Small bars will vibrate and create ripples on the end face when overhanging.
The ball hinge seat holes of shield tunneling propulsion cylinders are worn out of shape, with 32 oil cylinders pushing synchronously, squeezing the hole walls into ellipses. The shield body cannot be disassembled, so on-site repair is mandatory. For the long-span hole groups of ship rudder system supports, the boring bar must pass through in one go in the dock to guarantee coaxiality.
Corresponding capabilities of the XDT90: The φ90 boring bar handles large holes and long spans, with a machining range of 95—800mm, a maximum single-side cutting depth of 3mm, and a nominal roundness of 0.03mm. The worm gear and worm version has a feed stroke of 1000mm and is equipped with 4 supports, making it suitable for continuous feeding of long hole groups. For service teams, it essentially compresses the "large-diameter long hole group machining capability of a floor-type boring machine in the workshop" into a solution that can be fixed by on-site welding.
On-site operations can be structured as composite work orders, instead of only billing by the hour for "boring one hole":
Clean the reference surface: Remove old bushings, rust, welding slag, and sealant down to the bare metal, to establish a one-time centering reference for multiple holes arranged side by side.
Insert the bar and weld the supports: Insert the φ90 boring bar, and weld the support seats firmly to the solid section of the base material. The standard version comes with 2 supports, while the worm gear version has 4 supports. Add auxiliary supports in the middle for long bars with large spans.
Align and center: Use the matching positioning taper sleeves for central positioning, and calibrate coaxiality with a dial indicator. Multiple holes arranged side by side are machined in one single positioning to ensure their coaxiality.
Rough and finish boring: The 3kW servo motor drives automatic feeding at 50r/min, with 3mm single-side cutting as the upper limit. For the surfacing layers on cast steel parts, feed in layers according to the material, with a nominal roughness of 3.2μm.
Deliver with coaxiality inspection: Perform dial indicator testing to confirm the nominal roundness of 0.03mm, compare the roughness with standard samples, and record the coaxiality data of all holes. Archive the parameters of the first workpiece for reuse in subsequent jobs.
For customers, you can sell the value of "one on-site visit for large-diameter long hole groups, no disassembly or transportation required". For your team, it expands the order-taking capability to cover "φ95—800mm, one-time centering for multiple holes, and the ability to machine cast steel surfacing layers".
For medium-sized hinge holes of φ65—500mm with small surfacing volume → the XDT60 is lighter and more power-efficient.
For φ95—800mm, long hole groups, heavy cutting on cast steel, and scenarios requiring minimal disassembly of large workpieces → the XDT90 occupies this mid-range segment.
For diameters above φ220, spans ≤6m, and ultra-long spans such as ship stern shaft tubes → verify with the XDT110 and higher models.
Large flat square workpieces → use a gantry milling machine; flange end faces → use a flange lathe. The XDT90 only focuses on "large-diameter inner holes + coaxiality of long hole groups + post-surfacing machining".
We do not fabricate unrealistic "cost recovery in a few months" claims; calculate based on actual work orders:
New accessible incremental orders: List the orders you refused or subcontracted in the past 6 months due to "φ＞95mm, long hole groups, on-site machining required, applicable to mines/engineering machinery/ships/hydropower, and weldable supports", noting their aperture, hole spacing, surfacing layer thickness, support conditions, and 380V power availability.
Outsourcing cost savings: Subtract the costs of in-house labor, tools, electricity, depreciation, and wearing parts from the original expenses of outsourcing heavy floor boring, transportation, and reassistance assistance.
Work efficiency: Calculate the number of personnel for welding supports, the time for bar insertion and alignment, the first-piece machining time for the three aperture grades φ200/φ400/φ600, and the continuous boring length per hour. Arrange full schedules during mine regular inspections and ship dock periods, and fill gaps with local engineering machinery repair jobs in normal times.
Bar and aperture: The φ90 boring bar has no rust or collision marks; the machining range is 95—800mm, with a standard 2m bar.
Power and feed: 3kW servo motor at 50r/min with automatic feeding; the standard version has a 500mm feed stroke, while the worm gear version has 1000mm. The 3mm cutting depth must be tested on a test block to ensure no tool chatter during layered feeding.
First-piece accuracy: Bore a scrap cast steel test block to confirm the nominal roundness of 0.03mm and Ra3.2. Workpiece qualification is subject to the contract drawings.
Supports and centering: 2 supports for the standard version, 4 supports for the worm gear version; centering via positioning taper sleeves, with a process card for one-time positioning of multiple side-by-side holes.
Accessories: 3 auxiliary tool post specifications covering the full 95—800mm range, 1 set of tools, and welding fixing tooling.
Power and lubrication: 380V three-phase power supply; verify the number of centralized lubrication circuits according to the sub-model.
Documentation and training: Operation training covers bar insertion and support welding, dial indicator alignment, layered cutting, long hole group coaxiality control, and first-piece roundness inspection.
Purchasing the XDT90 is not just "adding another large boring machine". It pulls the in-situ machining orders for φ95—800mm long hole groups out of the "refused order zone". The four core strengths — the φ90 bar for rigidity, one-time multi-hole centering for coaxiality, 3mm cutting depth for surfacing layers, and welding fixing for on-site reference — make the investment worthwhile.
(This article is compiled based on public corporate materials and industry information for reference only. Specific product information and service terms are subject to the official release of the enterprise.)
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