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Method for determining wear state of rear cutter surface of cutter based on variable-feed trial cutting
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A technology of wear state and determination method, applied in the direction of manufacturing tools, measuring/indicating equipment, metal processing machine parts, etc., can solve problems such as difficult to achieve
Active Publication Date: 2021-11-05
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology
These two situations are feasible in medium and large batch processing, because the workpiece, tool and cutting amount are relatively fixed at this time, the cost of establishing reference curves or generating samples is low and the confidence is high, but in single piece, small batch production Under certain circumstances, due to the complex and diverse combinations of processing objects, tool types and cutting parameters, it will be difficult to establish a large number of reference curves or generate a large number of samples
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Embodiment 1
[0056] Such as figure 1 As shown, a method for determining the flank wear state of a tool based on variable feed trial cutting is carried out in the following steps:
[0057] Step 1. Determine the status information under investigation
[0058] Obtain the maximum back cutting amount α that the tool has used p-max ;
[0059] Determine the inspected state information according to the various working conditions of the tool that has been used, and equate the inspected state to the entire process use state of the tool, that is, the tool is considered to be used from a new tool in the inspected state to the current state. Wear state, the state under investigation needs to determine three parameters, the cutting speed is v cg , the amount of back cut is α pg , the feed rate is f g ; Next, according to the state under investigation (v cg , α pg , f g ) to plan and execute trial cut tests;
[0104] The difference between this embodiment and embodiment 1 is:
[0105] In said step four:
[0106]
[0107]
[0108]
[0109] Among them, K A 、K B 、K C is the fitted coefficient, b A , b B , b C is the index of the fit, which is obtained from the measured feedback signal and the corresponding feed rate.
[0110] In said step seven:
[0111] M1=ΔE A ;
[0112] M2=c%.
Embodiment 3
[0114] Take the external turning on a lathe as an example to illustrate. The equivalent investigation state corresponding to the use state of a worn tool in the whole process is the cutting speed V C =60m / min, feed rate f=0.3mm / r, back cutting amount α p =0.3mm; It is known that the maximum back cutting amount used by the tool is 0.3mm, and the main cutting force F is used z as a sign of wear.
[0115] State under investigation (v cg , α pg , f g ) = (60, 0.3, 0.3), α p-max =0.3;
[0116] According to known conditions, α pg ≥α p-max , so only two sets of trial cutting tests are required, and the designed cutting parameters are:
[0117] The first group (60m / min, 0.3mm, f i ), the second group (60m / min, 0.4mm, f i ),
[0121] According to two groups of trial cutting, record the corresponding main cutting force as follows:
[0122] A=(A 1 , A 2 ,....
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Abstract
The invention discloses a method for determining a wear state of a rear cutter surface of a cutter based on variable-feed trial cutting, comprising: firstly, determining inspected state information, and determining parameters of cutting speed, back engagement and feed; planning a trial cutting test according to the inspected state, then performing the trial cutting test, recording feedback signals of each group of trial cutting in sequence, constructing a signal difference value array on the basis of the feedback signals, and fitting the relationship between the signal difference value and the feed amount, thereby calculating the absolute consumption, the inherent consumption and the additional consumption of the rear tool surface, and measuring, calculating and evaluating the wear state of the rear cutter surface of the cutter represented by the absolute variation or the relative variation of the feedback signals. The method has the advantages that the abrasion state of the abraded cutter relative to a new cutter can be accurately measured and calculated, a complex algorithm model does not need to be built, and the method does not depend on a standard reference curve or a threshold value. The method is particularly suitable for detecting and evaluating the wear state of the cutter under the condition of single-piece and small-batch production.
Description
technical field [0001] The invention relates to the detection of tool wear state in mechanical processing, in particular to the measurement and evaluation of the tool flank wear state. Background technique [0002] During the metal cutting process, with the wear of the tool itself, the machining accuracy of the workpiece will be reduced, the surface roughness will be increased, and the cutting temperature will be increased, and even serious vibration will occur and it will not work properly. Therefore, detecting the wear state of the tool is of great significance to the quality, cost and efficiency of processing. [0003] Tool state detection can be generally divided into two categories: direct method and indirect method. Direct method, that is, the method of directly measuring the wear area or shape of the tool, including contact detection method, radiation detection method, and optical detection method, etc., is characterized by accurate measurement, but often requires sh...
Claims
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IPC IPC(8): B23Q17/09
CPCB23Q17/0957
Inventor 尹震飚刘霜曹华军李翔
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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