Boring Seat Ring Holes

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VD4HD-ADM Boring Machine

Application:

The VD4HD-ADM boring machine is designed to bore out valve seat ring bores in cylinder heads for the installation of oversize seat rings.

Operating Principle:

The standard bore is progressively bored out from top to bottom with a fine feed rate to the preset diameter. The exact feed path is governed by a precision guide mounted directly on the machine’s gearbox head. The valve seat bore is bored out smoothly and to precise tolerances for installing the oversize seat ring.

Features:

The drive unit of the VD4HD-ADM is identical to the drive unit of the VD4HD valve seat turning machine and is therefore only required if a VD4HD is not already available.
Instead of the seat machining gearhead, a boring gearhead is bolted onto the drive unit.
Two different boring gearheads are available.
The AV boring head is equipped exclusively with a vertical feed unit, while the AVH boring head features an additional horizontal feed unit.
Boring is performed using a fine-turning tool equipped with a micrometer scale for precise adjustment of the boring diameter.

Form-boring tools are available for machining a beveled step for the secure installation of O-rings.
A slip clutch integrated into the gearhead disengages the feed as soon as the tool tip reaches the bottom of the bore.

Thanks to its compact design, the VD4HD-ADM can be used both in the workshop and on site.

Technical Data:
Operating range:
Valve Machining
Valves with stem diameter	16 – 37 mm
Valves with seat diameter	60 – 230 mm
Valves with seat angle	45° – 20°
Valves with minimum length	> 400 mm
Valve Seat Machining
Valve seats with diameter	60 – 230 mm
Valve seats with seat angle	19.5° – 45°
_{For more information, please refer to our catalog/brochure}
Feed:
Speed range	120 – 350 rpm
Facing feed	0.12 mm/rev
Electrical equipment:
Power supply input voltage	100 – 300 VAC
Power consumption	0.5 kW
Machine operating voltage	max. 58 VDC
Dimensions and Weight:
Drive unit – Length/Width/Height	approx. 485 / 175 / 450 mm
Power supply unit – Length/Width/Height	approx. 380 / 180 / 210 mm
Base machine – Net weight	approx. 18 kg
Drive unit – Net weight	approx. 8 kg
_{Technical changes reserved}

OPERATION

Place the reference setting gauge onto the tool setting fixture and set the micrometer screw to the reference diameter.
Then place the machine onto the tool setting fixture and preset the boring diameter. Insert the pilot with support spider into the valve guide and lock it securely in place.
Mount the machine onto the pilot and position the tool tip just above the upper edge of the seat ring pocket.

BORING
Start and execute the boring process by pressing the power button. Repeat the boring process once or twice until the oversize diameter is achieved.