Changsha Epoch Direct Drive Technology Co., Ltd.

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ETK2806B/C 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 dual-channel CNC 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 under the condition of high-speed rotation of the spindle, with automatic dynamic balancing function, which can maintain high precision of the spindle; 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;
It adopts a dual-spindle dual-slide structure, which can simultaneously/separately process two pistons, with extremely high processing efficiency, and the processing cycle does not exceed 15s, which is especially suitable for automated production of gasoline engine pistons;
It is equipped with a high-precision eddy current separation chip removal device, with high filtration accuracy, and can choose side discharge or rear discharge.

Technical Parameter
Describe

Commodity name: ETK2806B/C Final Boring Machine

Serial Number	Item	Unit	ETK2806 B	ETK2806 C
1	Piston pin hole diameter	mm	Ф15～Ф60
2	Piston outer diameter	mm	Ф50～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	Does it have the function of processing elliptical holes?		No	Yes
8	Maximum effective offset of boring bar on one side	mm	0.06
9	Cylindricity of straight hole	mm	0.002
10	Roundness of straight hole	mm	0.001
11	Surface roughness	μm	Ra0.3
12	Process capability index		ΦD±0.003mmCmK≥1.67
13	Main unit (length × width × height)	mm	1800×2380×2347
14	Net weight of main unit	Kg	8000
15	Total power	Kw	30

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 solid 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, offering ease of operation, high reliability, and excellent stability. The NC programming and automatic machining program for the piston 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 thermostatically controlled oil tank, stepless speed control, high accuracy, long lifespan, and easy maintenance.
4. Linear Axes
The Z1/Z2 axes utilize high-precision ball screw pairs and imported high-precision linear rolling guides. The ball screws employ 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 X1/X2 axes are equipped with a micro-displacement boring servo device (a patented product of YiPai CNC), enabling the machining of piston irregular hole surfaces (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 accomplished at high spindle speeds, featuring automatic dynamic balancing to maintain high spindle rotation accuracy. The electrical resolution reaches 0.0001mm, with an effective radial displacement of 0.06mm, 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, deformable 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 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, metered (adjustable flow rate) automatic lubrication system, automatically supplying oil to the guide rails, screws, and other moving parts, 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. It uses a vortex separation scraper-type fully automatic chip conveyor with high filtration accuracy and reliable practicality.
Side or rear chip discharge options are available.

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