Changsha Epoch Direct Drive Technology Co., Ltd.

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ETK2606A Final Boring Machine

Function Introduction:
This machine tool is mainly used for machining piston irregular pin holes, including conical holes, curved holes, hyperbolic holes, and elliptical holes;
It adopts the SIEMENS 828D numerical control system, which is flexible and convenient for programming and has good stability;
It is equipped with a micro-displacement servo boring device. The micro-displacement movement of the boring bar is completed while the main shaft is rotating at high speed. It has an automatic dynamic balancing function and can maintain high precision of the main shaft;
The machine tool is equipped with a precision adjustment device for the main shaft inclination angle, which is used for machining superimposed elliptical holes in piston pin holes;
The size of the pin hole can be finely adjusted through the program, and the shape and position of the irregular hole can be adjusted through the program.

Technical Parameter
Describe

Commodity name: ETK2606A Final Boring Machine

Serial Number	Item	Unit	ETK2606A
1	Piston pin hole diameter	mm	Ф25～Ф60
2	Piston outer diameter	mm	Ф60～Ф160
3	Spindle accuracy	mm	0.002
4	Spindle speed	rpm	50～3600
5	Maximum adjustment range of spindle center height	mm	35
6	Maximum inclination angle between spindle center and guide surface	Degree	5
7	Maximum effective offset of boring bar on one side	mm	0.06
8	Cylindricity of straight hole	mm	0.002
9	Roundness of straight hole	mm	0.001
10	Surface roughness	μm	Ra0.3
11	Process capability index		ΦD±0.003mmCmK≥1.67
12	Main unit (length × width × height)	mm	2650×1720×2025
13	Net weight of main unit	Kg	5000
14	Total power	Kw	20

Main Machine Configurations:
1. Basic Components
The machine's base, slide, spindle housing, and other basic components are made using high-strength casting technology, resulting in 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-bearing capacity during machining.
2. Numerical Control (NC) and Electrical Control Systems
Utilizes a SIEMENS 828D numerical control system, 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. Spindle Unit
Employs a high-precision hydrostatic-dynamic spindle with an independent temperature-controlled oil tank and stepless frequency conversion speed control, ensuring high accuracy, long lifespan, and easy maintenance.
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), enabling the machining of irregularly shaped piston holes (tapered holes, curved holes, elliptical 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 and has proprietary intellectual property rights. The micro-displacement movement of the boring bar is accomplished at high spindle speeds, with an automatic dynamic balancing function to maintain high spindle rotation accuracy. The electrical resolution reaches 0.0001 mm, and the effective value of radial displacement is 0.06 mm, providing extremely high machining accuracy and stability.
6. Precision Elliptical Hole Machining Adjustment Device
Based on the oblique cutting principle, 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 strip, and scale plate. When precision boring an elliptical hole, the boring tool is adjusted to the major axis dimension D of the pin hole, and the minor axis dimension is d. Then, the base tilt angle α = arccos (d/D). Due to the tilt angle α of the base, the spindle axis rotates around the rotating shaft axis, and the cutting tip is lowered. Therefore, the spindle needs to be raised to a theoretical height H = (L+167)sin α + 230(1 - cos α), 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 metered (adjustable flow rate) automatic lubrication system, automatically supplying oil to the guideways, 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. The chip removal device is simple, environmentally friendly, practical, and reliable.

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