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Precise honing aperture prediction and control method for hydraulic matching parts

A control method and honing technology, which is applied in the direction of honing machine tools, manufacturing tools, metal processing equipment, etc., can solve the problems that the processing parameters cannot predict the honing material removal rate, affect the hole processing accuracy and surface quality, and do not propose the material removal rate, etc. , to achieve the effect of improving the honing material removal rate, improving the material removal rate, and ensuring the uniformity of the hole diameter after honing

Active Publication Date: 2021-10-12
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

In addition, qualitative analysis was not performed quantitatively because machining parameters failed to predict honing material removal rate
In addition, it does not propose the relationship between the material removal rate and the hole diameter accuracy after honing. The honing process often has the problem of poor hole diameter consistency after honing. One-sided pursuit of high processing efficiency will definitely seriously affect the hole processing accuracy and surface quality. Therefore, in ensuring Under the premise of high precision and high consistency of holes, maximizing processing efficiency is the key to solving the problem

Method used

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  • Precise honing aperture prediction and control method for hydraulic matching parts
  • Precise honing aperture prediction and control method for hydraulic matching parts
  • Precise honing aperture prediction and control method for hydraulic matching parts

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with accompanying drawings and examples.

[0050] Such as figure 2 The schematic diagram of honing stone movement is shown. The movement of honing stone is a combination of the external expansion motion, axial reciprocating motion and rotary motion of the stone 1. Affected by the reverse acceleration, the stone will first accelerate and then decelerate at a constant speed. The movement process, and the height of the exposed surface of the valve sleeve 2 hole when the end face of the oil stone is at the overtravel stop position is taken as the overtravel amount.

[0051] The total length of oilstone 1 is denoted as l s , width b, where the overrun is l u , the amount of overrun is l d , the initial aperture of the valve is d 0 , the reciprocating speed is V a , speed with V n express.

[0052] image 3 Shown is the force analysis diagram of the expansion cone pressure and the positive pressure ...

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Abstract

The invention discloses a precise honing aperture prediction and control method for hydraulic matching parts. The method comprises the steps of acquiring the machining parameters and geometric parameters of honing oilstone and the aperture value of a bottom hole before honing; establishing a honing material removal volume prediction model, considering the influence of the retention time on the material removal volume of an overtravel section, obtaining an improved honing material removal rate formula, and preliminarily calculating the honing material removal rate Qm and Ds values; according to initial post-honing aperture distribution, calculating the retention time value of the overtravel section; establishing a honing material removal volume improvement prediction model, and predicting the honing material removal rate and the post-honing aperture value; and carrying out an orthogonal honing test, carrying out significance analysis on honing test data, analyzing the influence of various process parameters on the material removal rate and the post-honing aperture difference, and verifying the accuracy of the model. The result shows that the proper retention time is added, the optimal process parameters are adopted for honing machining, the requirement for post-honing aperture consistency can be met, and the honing material removal rate is increased.

Description

technical field [0001] The invention relates to the technical field of hole finishing of difficult-to-machine materials, in particular to a method for predicting and controlling the hole diameter of a hydraulic couple precision honing. Background technique [0002] Honing is a finishing process that utilizes the honing oil stone to contact and extrude the cylindrical surface of the inner hole and cut off the material along the spiral trajectory. The processing materials are mainly cast iron and hardened steel, the processing size tolerance is IT7~IT4, and the surface roughness can reach 0.32 ~0.08μm, and is widely used in the production of cylinder bores, oil cylinder bores, and hydraulic cylinder bores. During the honing process, the honing head performs both circumferential rotation and axial reciprocating motion. At the same time, the expansion and contraction of the expansion cone rod in the honing head is controlled by hydraulic pressure to realize the radial expansion ...

Claims

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Application Information

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IPC IPC(8): B24B33/02B24B33/10
CPCB24B33/02B24B33/10
Inventor 杨长勇苏浩何鸿宇吴超迪傅玉灿丁文锋徐九华
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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