Bottle Boring Machine

Machine functions:

The machine tool is mainly used for boring deep holes in cavities, and can also be used for straight drilling and boring holes.

 

Machine tool processing mode: workpiece fixed, tool rotation, feeding; workpiece rotation, tool does not turn, tool feeding; workpiece rotation, tool rotation, tool feeding.

 

Cavity deep hole machining, CNC control tool X direction movement (tool expansion and contraction) and Z direction movement, X and Z direction two-axis linkage; tool to the workpiece bottom hole guide, the tool as a whole Z backward, at the same time the tool head X direction movement, to achieve the cavity hole machining.

 

The cutting oil is supplied through the oil pressure head, and reaches the cutting edge through the gap between the toolpost and the hole wall to cool and lubricate the tool, and the cutting oil is discharged into the chip hopper (in the direction of the headstock) with the chips forward, and then enters into the chip conveyor, which removes the chips, and the cutting oil is recycled after filtration and refrigeration.

Cavity hole machining schematic

Machine Overview

Machining range

Drilling range: Φ25~Φ120mm

Boring range： Φ40~Φ200mm

Maximum workpiece length/maximum hole depth: 3000mm

Machine main parts:

Machine bed , headstock, oil pressure head, drill bar support rest, drill box, sliding guide rail, ball screw, coolant system, control system, electric cabinet, workpiece carrier, Cavity hole machining device and so on .

Machine control system

Control system: SIEMENS-828D

X-axis: tool rising and shrinking, servo motor drives the axial movement of the mandrel through servo reducer and ball screw.

Z-axis: longitudinal feeding movement of drill rod box, servo motor drives the structure of ball screw.

W-axis: servo jacking of workpiece by oil pressure head, servo motor-driven ball screw structure.

Box, bed, carrier and other basic parts are made of high-quality cast iron precision casting, and after the casting is completed, it undergoes two aging treatments to eliminate internal stresses, stabilize the organization and dimensions, and improve the mechanical properties.

Machine bed

The bed is cast in resin sand and normalized after casting. The bed adopts split structure, assembled together with high strength bolts and positioned with taper pins.

Double rectangular sliding guide rails are adopted, precision ground, and the guide rail surface is quenched with high hardness.

Ball screws and scales are mounted in the bed to realize closed-loop control of tool Z-direction movement.

The bed body is arranged with V-type diagonal rib inside, which has high support strength and is not easy to be deformed; the outer wall of the bed body directly supports the guide rail, which can withstand large cutting force and has good rigidity, and it is not easy to be deformed and shaken during machining, which is conducive to the improvement of machine tool's machining quality and efficiency.

The periphery of the bed is casted with oil return groove, and the oil cover is installed on the oil return groove, so that the cutting oil on the bed automatically returns to the cooling oil tank.

Headstock:

Used to drive the workpiece rotation, fixed in the left end of the bed.

Manual 3-speed, stepless speed regulation within the gear, with servo spindle motor through the belt, gear box to drive the spindle rotation, the front end of the head stock is assembled with a manual chuck for clamping the workpiece.

Gears are precision ground and processed; gear tooth surface is treated with high frequency quenching so that the gears can obtain high strength, high hardness, high wear resistance and high fatigue limit, and can withstand relatively large alternating loads and shock loads.

The external lubricating oil tank circulates lubrication for gears and bearings, and a low liquid level alarm device is installed in the oil tank.

Push-button board is installed on the headstock body, which has the functions of spindle pointing, feeding forward, feeding backward and emergency stop.

A manual locking device is installed on the spindle of the headstock to lock the spindle when it is not required to rotate; a detection switch is installed on the locking device so that the main motor will not start when the spindle locking status is detected.

Headstock sketch for reference only

Oil pressure head:

It is used for tool guiding, tool oil supply, and tool bar support.

The servo motor is used to drive its axial movement to adapt to the machining of workpieces of different lengths, as well as the top tightening and loosening of workpieces. The servo motor can work in torque mode or position mode.

The oil pressure head slewing bearing is installed inside the oil pressure head body, which has good rigidity and high slewing precision. Slewing seal is mounted outside the right end of the oil pressure head body for easy maintenance.

The right end of the oil pressure head is mounted with a cutter bar support sleeve for supporting the cutter bar.

The left end of the oil pressure head is fitted with cone disk, guide sleeve and oil stop device, the cone disk is used to clamp the workpiece and the guide sleeve is used to guide the tool.

The oil blocking device is of push-pull structure, and the lower part of the oil blocking device is installed with an oil catching box to make the cutting oil flow back to the oil tank.

Oil pressure head sketch for reference only

Drill box :

For driving tool rotation, mounted on the feed pallet.

Servo spindle motor through the belt, pulley, gear system to drive the spindle rotation.

The left end of the spindle is fitted with a shank coupling sleeve for tool clamping.

The right end of the spindle is equipped with a chip conveyor for discharging chips.

The gears are precision ground and processed; the gear tooth surface is quenched by high-frequency quenching treatment, so that the gears can obtain high strength, high hardness, high wear resistance and high fatigue limit, and can withstand large alternating loads and impact loads.

External lubricating oil tank for gears and bearings circulating lubrication, the oil tank is installed with low liquid level alarm device.

Drill box sketch for reference only

Drill bar support rest:

Used to support the tool bar;

Adopting high rigidity monolithic structure, which is assembled with a support sleeve that can absorb the impact and jitter generated during machining.

Installation of automatic hanging and pulling mechanism, when retracting the tool, the feed pallet can automatically pull the tool bar support back to the initial position.

Tool bar support rest sketch for reference only

Coolant system:

It mainly consists of chip conveyor, oil cooler, filter, pump set, oil tank and so on.

Oil tank: it is installed on the ground without digging a pit, and the oil tank adopts high-quality steel plate with full welding treatment.

Chip conveyor: it is installed in the oil tank and removes chips automatically.

Oil cooler: start automatically when the oil temperature reaches the set upper limit; stop automatically when the oil temperature reaches the set lower limit.

Filter: adopts paper belt filtration to improve the cleanliness of cutting oil.

Pump group: 3 groups of quantitative vane pumps, two of which have a maximum oil supply pressure of 2.5Mpa and a flow rate of 100L/min each, and the other group has a maximum oil supply pressure of 1Mpa and a flow rate of 200L/min.

The cutting oil pressure, level, oil temperature and flow rate can be displayed on the digital display on the control station.

Coolant system sketch for reference only

Feed bracket：

Used to drive the axial movement of the tool.

Adopt automatic lubrication station to lubricate the sliding guideway surface at regular time and quantity.

Push-button plate is installed on the pallet, with the functions of drilling rod box spindle pointing, feeding forward, feeding backward, and emergency stop.

Lubrication system：

The sliding guide surface of the feed pallet adopts automatic lubrication station to lubricate regularly and quantitatively, with low liquid level alarm function.

The headstock box bearings and gears are lubricated by independent external oil tank circulation, with low liquid level alarm function.

The bearings and gears of drilling rod box adopt independent external oil tank for circulating lubrication, with low liquid level alarm function.

The oil pressure head carrier and tool bar support carrier are lubricated by manual lubrication pump.

Workpiece carrier:

It is used for pre-positioning the workpiece.

The operator first puts the workpiece on the workpiece bracket, and after the workpiece is clamped and positioned, the workpiece leaves the bracket. The V-frame on the workpiece carrier is raised and lowered manually by using the T-screw.

Workpiece carrier sketch for reference only

Center frame:

For supporting workpieces; three-point closed center frame construction with two rollers below and one roller above; the two rollers below are adjusted for lateral position by means of a screw.