Bta Deep Hole Boring System

Bta Deep Hole Boring System

Bta deep hole boring system is a machining process used to create deep bores in workpieces.bta deep hole boring system The process requires high power and torque precision and low vibration. This is achieved through the use of vibration dampeners, which are installed in the machine to stabilize the drill during machining. The dampeners are typically built using rotating bearings that contact the drill to provide vibration dampening benefits. Longer drills may require multiple traveling dampeners, while shorter machines may not need any.

BTA drilling is often performed on components with complex geometry, such as automobile cylinder heads, crankshafts, steering gear racks, and valve cores. The accuracy of the drilled holes is important, especially in terms of dimensional accuracy and surface quality. The dimensional accuracy of the hole is affected by both manufacturing errors and the burnishing contact state between the guide blocks and the hole wall during the machining process. The contact state is controlled by the matching tolerance between the inner diameter of the bore tube and the machining center shaft, as well as the matching tolerance between the bore tube and the BTA drill.

Vibration is an important factor in determining the quality of the resulting hole. The vibrations generated during BTA drilling cause the formation of radial chatter marks, which manifest as multi-lobe-shaped deviations of the cross section of the hole from absolute roundness. These deviations are transmitted by the flexural vibration of the BTA drill and spread along the hole walls in a spiraling pattern. The resulting helical structure is called spiraling [1].

Several factors contribute to the generation of chatter vibrations during BTA drilling. The dynamic torsional and flexural rigidity of the drilling tool is significantly lower than that of conventional cutting tools due to the high l/D ratios. In addition, the cooling lubricant is not well adapted to the abrasive and corrosive nature of the metal-working fluids used in BTA drilling. The resulting instability of the drilling tool causes vibrations that can be recorded by microphones and strain gauges, as shown in the Figure below.

The BTA drilling process generates a significant amount of heat, which can have a negative impact on the machining conditions and the tool life. To prevent this from occurring, a cooling system is required to maintain the temperature of the cutting fluid in a safe range. The cooling system usually consists of a heat exchanger and a chiller.

The directional control of the drilling head during BTA machining is essential for the correct alignment of the bore wall with the guide tube. However, the current compensation methods based on tilting the drilling head require either interrupting the drilling operation or implementing an additional counterboring process. In this article, a new compensation method is proposed that allows targeted influencing of the straightness deviation in the running process with minimal time interruption and additional machining steps. The approach uses adjustable elements mounted between the drill head and the bore pipe, allowing for targeted tilting of the drilling head with respect to the bore tube.

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