Changsha Epoch Direct Drive Technology Co., Ltd.

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ETK2712A Final Boring Machine

Function Introduction:
This machine tool is mainly used for semi-finishing and finishing of irregularly shaped pin holes (tapered holes, curved holes, hyperbolic holes) in aluminum or forged steel pistons. It adopts a dual-spindle structure with left and right arrangement. One spindle (left spindle) is a precision boring spindle, and the other spindle (right spindle) is a semi-precision boring spindle;
The precision boring spindle is a hydrostatic spindle, equipped with a precision micro-displacement boring servo device, which completes the machining of the piston irregular pin hole surface (tapered hole, curved hole) while the spindle rotates at high speed. The size of the pin hole can be finely adjusted by the program, and the size and length of the irregular hole can be adjusted by the program;
It uses a SIEMENS 828D numerical control system, which is flexible and convenient for programming and has good stability.

Technical Parameter
Describe

Commodity name: ETK2712A Final Boring Machine

Serial Number	Item	Unit	ETK2712 A
1	Piston pin hole diameter	mm	Ф80～Ф130
2	Piston outer diameter	mm	Ф200～Ф400
3	Precision boring spindle		Hydrostatic spindle
4	Semi-precision boring spindle		A2-8 bearing spindle
5	Precision boring spindle accuracy	mm	0.002
6	Semi-precision boring spindle accuracy	mm	0.003
7	Precision boring spindle speed (servo spindle)	rpm	0～1500
8	Semi-precision boring spindle speed (servo spindle)	rpm	0～1500
9	Maximum effective offset of precision boring tool on one side	mm	0.1
10	Cylindricity of precision hole single-side pin hole linear segment	mm	0.0035 (aluminum)
11	Roundness of precision hole pin hole	mm	0.0025 (aluminum)
12	Surface roughness	μm	Ra0.4 (aluminum)
14	Main unit (length × width × height)	mm	3600×1700×2450
15	Net weight of main unit	Kg	6500
16	Total power	Kw	25

Main Machine Configurations:
1. Basic Components
The machine's base, slide, spindle housing, and other basic components are made using high-strength casting technology, with a stable internal microstructure. The casting structure has undergone machine dynamics analysis and finite element analysis to optimize its geometry and ensure high rigidity. The wide and sturdy machine base, with its full-support load design, adheres to advanced material mechanics design principles, ensuring load capacity during machining.
2. Numerical Control (NC) and Electrical Control Systems
It uses a Siemens 828D numerical control system from Germany, which is easy to operate, highly reliable, and stable. The NC programming and automatic machining program for pistons are both instruction code programming, making programming simple. The interface is clear and aesthetically pleasing, with complete functionality.
3. High-Precision Spindle Unit
The precision boring spindle uses a high-precision hydrostatic spindle with an independent constant-temperature oil tank. The spindle servo motor is driven by a multi-V-belt, ensuring high precision, long life, and easy maintenance; the semi-precision boring spindle uses a high-precision bearing spindle, with the spindle servo motor driven by a multi-V-belt, offering high rigidity and long life.
4. Linear Axes
The Z-axis uses a high-precision ball screw and imported high-precision linear rolling guide. The ball screw uses a pre-tensioned assembly process, greatly increasing transmission rigidity and eliminating thermal deformation during high-speed movement, thus ensuring the machine's positioning accuracy and repeatability, resulting in stable machining accuracy.
The X-axis is equipped with a micro-displacement boring servo device (a patented product of YiPai CNC), which completes the machining of irregularly shaped surfaces (tapered holes, curved holes, hyperbolic holes) in steel pistons. The diameter of the pin hole can be fine-tuned through the machining program.
5. Micro-Displacement Boring Servo Device EJX5110A
The micro-displacement boring servo device configured on the machine is independently developed by YiPai and has independent intellectual property rights. The micro-displacement movement of the boring bar is completed at high spindle speeds, with an automatic dynamic balancing function to maintain high spindle rotation accuracy. The electrical resolution reaches 0.0001 mm, the effective value of radial translation is 0.1 mm, and it has extremely high machining accuracy and stability.
6. Precision Elliptical Hole Machining Adjustment Device
Based on the principle of oblique cutting, a high-rigidity precision elliptical hole machining adjustment device has been developed. It mainly consists of a V-shaped base plate, deformed angle iron, adjustable base plate, inclined iron, spindle base, bearing seat, rotating shaft, rotating pin, guide key, guide bar, and scale plate. When precision boring an elliptical hole, the boring tool is adjusted to the major axis size D of the pin hole, and the minor axis size is d, then the base tilt angle; because the base is tilted, the spindle axis rotates around the rotating shaft axis, the tool tip is lowered, so the spindle needs to be raised to the theoretical height, where L is the distance from the boring bar mounting surface to the center line of the boring tool.
7. Lubrication System
The machine uses a timed and quantitative (adjustable flow rate) automatic lubrication system, automatically supplying oil to the guide rails, screws, and other moving parts as needed, avoiding waste and reducing environmental pollution.
8. Others
The machine is equipped with a fully enclosed protective cover, a high-flow cooling system, and is aesthetically pleasing, safe, and leak-proof.

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