Changsha Epoch Direct Drive Technology Co., Ltd.

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ETK2708A Final Boring Machine

Function Introduction:
This machine tool is mainly used for semi-finishing and finishing of forged steel piston irregular pin holes (tapered holes, curved holes, hyperbolic holes). 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 static-dynamic pressure 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: ETK2708A Final Boring Machine

Serial Number	Item	Unit	ETK2708 A
1	Piston pin hole diameter	mm	Ф30～Ф80
2	Piston outer diameter	mm	Ф80～Ф200
3	Precision boring spindle		Static and dynamic pressure spindle
4	Semi-precision boring spindle		A2-6 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	0.06
10	Cylindricity of precision hole linear segment pin hole on one side	mm	0.004
11	Roundness of precision hole pin hole	mm	0.002
12	Surface roughness	μm	Ra0.63
14	Main unit (length × width × height)	mm	2900×1692×2450
15	Net weight of main unit	Kg	5500
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
Utilizes a Siemens 828D numerical control system from Germany, offering ease of operation, high reliability, and excellent stability. The NC programming and automatic machining program for pistons are both instruction code-based, simplifying programming. The interface is user-friendly, clear, and feature-rich.
3. High-Precision Spindle Unit
The precision boring spindle uses a high-precision hydrostatic spindle with an independent temperature-controlled oil tank. The spindle servo motor is driven by a multi-V-belt, ensuring high precision, long lifespan, 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 lifespan.
4. Linear Axes
The Z-axis uses a high-precision ball screw and imported high-precision linear rolling guideways. The ball screw employs a pre-tensioned assembly process, significantly increasing transmission rigidity and eliminating thermal deformation during high-speed movement, thus ensuring the machine's positioning accuracy, repeatability, and stable machining precision.
The X-axis is equipped with a micro-displacement boring servo device (a patented product of YiPai CNC), enabling the machining of irregularly shaped surfaces on steel pistons (tapered holes, curved holes, hyperbolic holes). The diameter of the pin hole can be fine-tuned through the machining program.
5. Micro-Displacement Boring Servo Device
The machine's micro-displacement boring servo device is independently developed by YiPai, with proprietary intellectual property rights. The micro-displacement movement of the boring bar is achieved at high spindle speeds, with an automatic dynamic balancing function to maintain high spindle rotation accuracy. The electrical resolution reaches 0.0001 mm, with an effective radial displacement of 0.06 mm, ensuring extremely high machining accuracy and stability.
6. Lubrication System
The machine uses a timed, quantitative (flow adjustable) automatic lubrication system, automatically supplying oil to the guideways, ball screws, and other moving parts, avoiding waste and reducing environmental pollution.
7. 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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