Middle-convex and varying ellipse curve machining method

A processing method and ellipse-changing technology, applied in metal processing equipment, manufacturing tools, turning equipment, etc., can solve problems such as complicated programming, long programming time, troublesome adjustment, etc., and achieve convenient program adjustment, simplified programming, and The effect of proofreading convenience

Active Publication Date: 2017-08-08
SHANNXI DIESEL ENGINE HEAVY IND
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Problems solved by technology

[0010] In order to solve the technical problems of complex programming, long programming time, and troublesome adjustment during error correction in the existing convex variable elliptic curve p...

Method used

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  • Middle-convex and varying ellipse curve machining method
  • Middle-convex and varying ellipse curve machining method
  • Middle-convex and varying ellipse curve machining method

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Embodiment Construction

[0046] The lathe used in this embodiment is the omega80 model of British BsA Tools company. refer to figure 2 and 3 , introduce the machining process.

[0047] Step 1: The characteristic of the convex variable ellipse piston is that the cross section of the piston is similar to an ellipse shape, and the ellipticity values ​​at different piston heights are different, and it is drum-shaped or convex in the longitudinal direction, and the piston becomes elliptical in shape. given by design drawings. As in the accompanying drawings figure 1 and 2 As shown, according to the ellipticity value at the height of the piston, the polar angle Φ between the ellipse shape line and the semi-major axis, and the reduction amount e are calculated. The cross-section is left-right and up-down symmetrical, and only needs to calculate the reduction amount from 0 to 90° (the first quadrant).

[0048] Reduction: e={SIN(Φ)*SIN(Φ)}*c / 2

[0049] The difference between the diameters of the majo...

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Abstract

The invention relates to a middle-convex and varying ellipse curve machining method. The technical problems that an existing middle-convex and varying ellipse curve machining process is complex in programming, long in programming time, and troublesome in error-correction adjustment are solved. The method comprises the following steps that a machining main program is established by obtaining a machining object; ellipse line section data are established; the ellipse line section machining data are imported by means of a machine tool cam data template; a machine tool second channel ellipse line machining program is established; a machine tool first channel machining main program and the machine tool second channel ellipse line machining program are imported; first workpiece trail cutting machining is performed; and an ellipse line section roundness measuring instrument is adopted for detecting the roundness of a machined workpiece. The middle-convex and varying ellipse curve machining method is widely applied to piston machining.

Description

technical field [0001] The invention relates to the technical field of piston processing, in particular to a processing method for convex and variable elliptic curves. Background technique [0002] The piston is one of the key components of the internal combustion engine. It works in a harsh environment of high temperature and high pressure, and is prone to thermal deformation and stress deformation. In order to counteract the thermal deformation of the piston when the engine is working, the piston should be made into an appropriate shape in a cold state. Therefore, the existing pistons are designed to have a convex longitudinal section, an elliptical cross-section and different skirt heights. An ellipse is also a gradually changing complex space surface, that is, a convex-to-elliptic curve. [0003] Generally, CNC lathes cannot process convex and variable elliptic curve pistons, and only special equipment can complete them. The current processing methods mainly include t...

Claims

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Application Information

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IPC IPC(8): B23B1/00B23B5/36
CPCB23B1/00B23B5/36B23B2215/245
Inventor 燕和平董严茂
Owner SHANNXI DIESEL ENGINE HEAVY IND
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