Counterbore Headstock

Description

The customer, a machine-tool manufacturer in Germany, was looking for a solution to apply counterbores to the mounting bores at the back of the headstock. The problem was that counterboring these bores from the front is very complicated.

Application Details

Application Details

  • Through hole: Ø13.0 mm
  • Counterbore backward: Ø30.0 mm. This implies that the counterbore is 2.3 times larger than the bore.
  • Material: Grey cast GG25

Proposed solution

Proposed solution

The solution proposed by HEULE is the most efficient BSF (Back-spot-facer) tool.

A standard BSF tool with a working length of 50 mm has been selected.

Machining parameters:
Speed: 350 rpm, Cutting speed: vc 35 m/min.
Working feed: 0.04 mm/rev.

The tool has to be operated with internal coolant with a pressure of 20 bar minimum.

Customer benefits

Customer benefits

The customer's interest focussed on increasing the process capability as well as the reduction of tool procurement costs.

The use of BSF has enabled the customer to eliminate a post-production process step.
The old tool made high demands on the workpiece. The bore had to be reamed for the tool guidance although it was "only" a screw head countersink. Also, the requested counterbore diameter could not be reached because of the too big ratio. This entailed an addional operation step.

Customer Satisfaction

Customer Satisfaction

The customer is very satisfied by the result and the achieved time savings. The headstock leaves the machine readily processed. The need to give the headstock to an additional process step to obtain the nominal counterbore diameter is obsolete.
The BSF tool is not only more cost-effective than the competition but also process capable and maintenance-free.