CN113695648A - Camshaft cam fillet milling optimization design method - Google Patents
Camshaft cam fillet milling optimization design method Download PDFInfo
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- CN113695648A CN113695648A CN202111127016.5A CN202111127016A CN113695648A CN 113695648 A CN113695648 A CN 113695648A CN 202111127016 A CN202111127016 A CN 202111127016A CN 113695648 A CN113695648 A CN 113695648A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
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Abstract
The invention provides a camshaft cam fillet milling optimization design method, which adopts an alloy end mill with a cutter blade with a certain radius to perform milling processing, and adopts a layer-by-layer arc progressive mode; calculating the contact area between the cutter and the processing arc, and controlling a cam fillet by adjusting the contact area; and performing trial production, feeding back results, and selecting an optimal scheme. The invention reduces the limitation of the fillet optimization design of the large fillet cam of the camshaft of the engine, improves the maturity of the processing method, and ensures the one-time success of the design of the process method, thereby improving the effectiveness of the optimization design calculation.
Description
Technical Field
The invention belongs to the field of camshaft machining, and particularly relates to an optimal design calculation method for camshaft cam fillet milling.
Background
The general scheme of cam fillet milling optimization design calculation is as follows: when the end mill is used for milling the cam fillet, the size of the fillet is determined by the fillet size of the blade arranged on the cutter (the size of the blade fillet is the same as that of the milled cam fillet), the optimized design is carried out, various schemes (cutting parameters such as the feeding amount and the feeding speed of the cutter are changed) and processing sequences are formulated, and the most suitable processing parameters are found to ensure the size requirement of the cam fillet.
The common cam has smaller processing fillet, the processing technology is universal and mature by directly milling and forming the cutter fillet, and the abrasion and milling resistance to the blade are in the range which can be born by the blade, so the consistency of the processing result of the cam fillet can be basically ensured by adopting the method for processing the cam fillet.
For the parts with large requirement on the R value of the cam fillet and high machining precision, the fillet requirement is high, so that the machining scheme has certain uniqueness and originality due to the high requirement on the precision, a mature scheme for reference does not exist, the machining difficulty is high, and the R value of the fillet cannot be effectively guaranteed. If the radius of the tool nose of the blade is made into a corresponding radius value, the arc radius value of the tool nose is overlarge, so that the cutting resistance is increased sharply during processing, the abrasion of the blade is accelerated if the radius is light, and the phenomenon of tool hitting is directly caused if the radius is heavy, so that the processing tool and the processing product parts are scrapped.
Therefore, the original optimization design method has certain limitation for the milling method of the large cam fillet of the engine camshaft.
Disclosure of Invention
The invention provides a camshaft cam fillet milling optimization design method, which reduces the limitation of the engine camshaft large fillet cam fillet optimization design, improves the maturity of the processing method, ensures the one-time success of the process design, and improves the effectiveness of the optimization design calculation.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a camshaft cam fillet milling optimization design method comprises the following steps:
s1, milling by adopting an alloy end mill with a cutter blade with a certain radius;
s2, calculating the contact area between the cutter and the processing arc during cutting according to different arc angles by using the radius size of the cutter in the processing process, and controlling the round angle of the cam by adjusting the contact area;
s3, performing trial-manufacture processing production according to the calculation of the step S2, and feeding back a result;
s4, optimizing and adjusting parameters according to the feedback result;
and S5, repeating the steps S2-S4 until the processing effect is not improved any more, and the final design scheme is the optimized scheme.
Further, in the step S1, the milling process is performed in a gradual arc-by-arc manner.
Further, the different arc angles in step S2 refer to arc angles between different product journals.
Further, the calculation method of the contact area in step S2 includes: and establishing a right-angled triangle according to the radius value of the cutter blade and the fillet R value of the journal of the product, calculating to obtain the contact area between the cutter and the machined surface, and programming a milling program according to the length of the cutter.
In a new step, the adjusting manner of the contact area in step S2 includes: according to the shaft neck fillets of different products, different contact areas of the cutter and the machining surface are obtained through calculation, adjustment and selection are carried out, and the R value of the fillet is guaranteed.
Compared with the prior art, the invention has the following beneficial effects:
the invention can process the cam fillets with different sizes by utilizing the same cutting tool to the maximum extent, reduces the limitation of the optimized design of the large fillet cam fillet of the engine camshaft, improves the maturity of the processing method, and ensures the one-time success of the process design, thereby improving the effectiveness of the optimized design calculation, effectively reducing the use cost of the tool and ensuring the processing quality of the product, and simultaneously improving the acceptance of customers on the processing of the product of an enterprise and the satisfaction and reliability of the customers on the processing enterprise.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The optimal design calculation is a design method for selecting and calculating an optimal scheme from a plurality of schemes. The method is based on an optimization theory in mathematics, takes a computer as a means, establishes an objective function according to a performance target pursued by design, and seeks an optimal design scheme under the condition of meeting various given constraint conditions. The invention mainly aims at the optimization design calculation of the camshaft cam fillet milling.
The size requirement of a common cam fillet is R1-R3, the machined fillet is small, and the consistency of the machining result of the cam fillet can be basically ensured by adopting the conventional cam fillet milling optimization design calculation. However, for a large R fillet, the requirement on the fillet is high, and the precision requirement is high, so the invention provides a method for milling the optimized design of the cam fillet.
The method specifically comprises the following steps:
(1) milling by using an alloy end mill with a certain radius of a cutter blade, such as R3;
(2) on the premise of continuously optimizing design and calculating cutting parameters, the cutting mode adopts a layer-by-layer arc progressive mode to process;
(3) in the processing process, adjustment can be performed according to the R value of the arc angle between the shaft necks of different products, for example, the round angle between the shaft necks on one shaft is R3, the round angle between the shaft necks on the other shaft is R4, and the processing can be performed through adjustment;
the radius size of the cutter is fully utilized to carry out optimization design calculation according to different arc angles, namely the contact area between the cutter and a processed arc during cutting is calculated, and the purpose of controlling a fillet is achieved by adjusting the contact area;
the calculation and adjustment of the contact area are as follows: because the radius of the end mill is fixed (R3 in the embodiment), namely the radius of the cutter does not need to be changed, a right-angled triangle is established according to the radius value of the cutter and the R value of the shaft neck fillet of the product, the contact length between the cutter and the processing surface is calculated, and the contact area is represented; and (5) programming a milling processing program based on the length of the cutter. The method can obtain different contact lengths of the cutter and the processing surface by calculation according to the shaft neck fillets of different products, so as to compile different processing programs and ensure different R values of the arc angles among the shaft necks;
(4) performing trial-manufacture processing for multiple times, feeding back results according to milling effects, such as whether tool marks exist or not, surface roughness and the like, and performing optimization adjustment by adjusting parameters such as tool feeding speed, spindle rotating speed and the like according to the result feedback, namely continuously and reasonably optimizing a design calculation method until the processing effect is not improved any more, considering that the expected processing effect is achieved, and preliminarily confirming that the final method is the optimization design calculation result;
(5) compiling an optimized design calculation processing summary report, and summarizing various conditions in the processing process; explaining the conditions of the new processing technique;
(6) collecting materials such as precision, functions and the like of equipment used in the process of processing trial production;
(7) collecting the inspection record data of each trial processing
(8) And after trial production has no processing problem, solidifying the optimization design calculation method.
The method is used for optimally designing and calculating the contact area between the cutter and the workpiece aiming at radius values of different cam fillets so as to ensure that the radius of a milled arc reaches a drawing requirement value; meanwhile, the invention confirms the processing consistency of the arc fillets of the cams at different positions of the same product.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. A camshaft cam fillet milling optimization design method is characterized by comprising the following steps:
s1, milling by adopting an alloy end mill with a cutter blade with a certain radius;
s2, calculating the contact area between the cutter and the processing arc during cutting according to different arc angles by using the radius size of the cutter in the processing process, and controlling the round angle of the cam by adjusting the contact area;
s3, performing trial-manufacture processing production according to the calculation of the step S2, and feeding back a result;
s4, optimizing and adjusting parameters according to the feedback result;
and S5, repeating the steps S2-S4 until the processing effect is not improved any more, and the final design scheme is the optimized scheme.
2. The camshaft cam fillet milling optimal design method as claimed in claim 1, wherein the milling cutting mode of step S1 is a layer-by-layer arc progressive mode.
3. The camshaft cam fillet milling optimization design method as claimed in claim 1, wherein the different arc angles in step S2 refer to arc angles between different product journals.
4. The camshaft cam fillet milling optimization design method as claimed in claim 1, wherein the calculation manner of the contact area in step S2 includes: and establishing a right-angled triangle according to the radius value of the cutter blade and the fillet R value of the journal of the product, calculating to obtain the contact area between the cutter and the machined surface, and programming a milling program according to the length of the cutter.
5. The camshaft cam fillet milling optimization design method as claimed in claim 1, wherein the adjustment manner of the contact area in step S2 includes: according to the shaft neck fillets of different products, different contact areas of the cutter and the machining surface are obtained through calculation, adjustment and selection are carried out, and the R value of the fillet is guaranteed.
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| CN110653403A (en) * | 2019-10-16 | 2020-01-07 | 盐城工业职业技术学院 | Method for rapidly predicting cutting area of each tooth during fillet milling |
| US20200016669A1 (en) * | 2016-09-22 | 2020-01-16 | Open Mind Technologies Ag | Method for material-removing machining of fillets on a workpiece |
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2021
- 2021-09-26 CN CN202111127016.5A patent/CN113695648B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000190166A (en) * | 1998-12-25 | 2000-07-11 | Kubota Corp | Tool path determining method, tool path determining device and recording medium |
| CN1894066A (en) * | 2003-12-17 | 2007-01-10 | 昭和电工株式会社 | Method for producing forging die, forging die and forged article |
| JP2007015081A (en) * | 2005-07-11 | 2007-01-25 | Matsui Tekkosho:Kk | Compound working machine and machining method using the same |
| CN202411508U (en) * | 2011-12-30 | 2012-09-05 | 泉州鲤城福辉汽车配件有限公司 | Computer numerical control (CNC) cam shaft milling machine |
| CN102581360A (en) * | 2012-03-22 | 2012-07-18 | 沈阳飞机工业（集团）有限公司 | Method for processing complex curved surface by numerical control processing progressive interpolation |
| CN104400092A (en) * | 2014-11-28 | 2015-03-11 | 湖北三江航天险峰电子信息有限公司 | Milling finish machining method for three-dimensional profile with composite inclined surface on outline |
| CN107407926A (en) * | 2015-03-13 | 2017-11-28 | 株式会社牧野铣床制作所 | Tool paths generation method and tool paths generation device |
| US20200016669A1 (en) * | 2016-09-22 | 2020-01-16 | Open Mind Technologies Ag | Method for material-removing machining of fillets on a workpiece |
| CN107984010A (en) * | 2017-11-10 | 2018-05-04 | 株洲钻石切削刀具股份有限公司 | A kind of corner-rounding end milling cutter |
| CN110653403A (en) * | 2019-10-16 | 2020-01-07 | 盐城工业职业技术学院 | Method for rapidly predicting cutting area of each tooth during fillet milling |
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