CN103075920B - Grinding processing method of parts with discontinuous surface features - Google Patents
Grinding processing method of parts with discontinuous surface features Download PDFInfo
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- CN103075920B CN103075920B CN201210550465.5A CN201210550465A CN103075920B CN 103075920 B CN103075920 B CN 103075920B CN 201210550465 A CN201210550465 A CN 201210550465A CN 103075920 B CN103075920 B CN 103075920B
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Abstract
The invention relates to a grinding processing method of parts with discontinuous surface features and belongs to the technical field of grinding processing and detection control. According to the method, before the grinding processing, corresponding parameters are set according to the grinding processing state and the discontinuous surface features of rotary parts, in addition, the parameters are stored into a database, when a measuring head of a sensing device goes in or out of grooves arranged at the surfaces of the parts, a discontinuous modification method and a synchronous feature compensating method can be correspondingly selected according to whether the grooves arranged on the rotary parts to be processed are periodically distributed in the circumferential direction of the parts or not, and the mutational measurement size value is subjected to automatic data modification and compensation processing, so in the grinding processing process of the parts with the discontinuous surface features, the problem of grinding processing interrupt caused by error action judgment a measurement control instrument is avoided, and meanwhile, the accuracy and the reliability of the on-line measurement in the grinding processing are improved.
Description
Technical field
The present invention relates to a kind of grinding processing method with discontinuous surface characteristic part, belong to grinding and detection control technical field.
Background technology
Mill processing active measurement technology efficiently solves traditional grinding and there is the problem that homogeneity of product is poor, quality is unstable, working (machining) efficiency is low.Mill processing Active measuring controller is a kind of on-line measurement part and can controls the equipment of grinding process, is widely used in automatic, semi-automatic grinding machine.In the grinding course of work, carry out online part dimension measurement all the time, and its size changing amount is passed to controller at any time, then send by control appliance the action that signal controls grinding machine, can effectively improve product quality and production efficiency.
The slewing parts with discontinuous surface feature often can be run in grinding; such as: the axle (hole) etc. of spline, gear, band key (wheel hub) groove; online process is ground to these slewing parts; when encountering groove position; sensing device gauge head turnover groove records size and undergos mutation; the sudden change of measured value can affect the certainty of measurement of Active measuring controller on the one hand; cause the erroneous judgement of mill processing Active measuring controller on the other hand, cause the interruption of Grinding Process.
Summary of the invention
The object of this invention is to provide a kind of grinding processing method with discontinuous surface characteristic part, there is the slewing parts of discontinuous surface feature (as: keyway, wheel hub groove, spline, gear recesses etc.) in automatic grinding processing with solution, the gauge head of sensing device can cause the sudden change of measured value when passing in and out part discontinuous surface groove, the sudden change of measured value can affect the certainty of measurement of Active measuring controller on the one hand, if do not carry out the generating date of being correlated with on the other hand, the action of controller also can be caused to judge by accident, cause the problem of grinding process interruption.
The present invention is for solving the problems of the technologies described above and providing a kind of grinding processing method with discontinuous surface characteristic part, and the step of this grinding processing method is as follows:
1) before grinding, set corresponding parameter according to the discontinuous surface feature of slewing parts and grinding state, and parameter is preserved in a database;
2) slewing parts to be processed is arranged on grinding machine carries out grinding, judge whether the groove on slewing parts to be processed is that periodic distribution is in the circumference of part, if not periodic distribution, then enter step 3), by interrupted revised law, measurement data is processed; If periodic distribution, then enter step 4), by the feature compensation method same period, measurement data is processed;
3) described interrupted revised law is impartial according to the grinding variable quantity of accessory size after each sampling period, accessory size variable quantity and desired cut amount are contrasted, when sensing device gauge head turnover keyway causes size to suddenly change, this size changing amount is directly modified to theoretical size variable quantity to export, enters step 5);
4) described same period, feature compensation method was according to certain by the time of grinding stage gauge head turnover groove, the triggering mode of gauge head turnover groove is set, after triggering, by gauge head, the measurement data passed in and out in the groove part time period is cast out, search for the characteristic value in the same period simultaneously according to triggering mode difference, characteristic value is substituted as compensation and exports;
5) using step 3) or step 4) result that exports is as measurement result, measuring and controlling instrument judges whether to reach setting grinding state according to this measurement result, thus control grinding machine uninterruptedly carries out grinding to slewing parts to be processed, until this part completes whole grinding process.
Described step 3) in that the size changing amount that sensing device is measured directly is modified to the process of theoretical size variable quantity is as follows:
A) slewing parts grinding change in size theoretical value Δ d to be processed in the sampling period is calculated, if the actual size value recorded of current sensor device is d
2, last time, size output valve was d
1, make c=d
2-d
1;
B) absolute value of c and Δ d are compared, when | then judge during c| >=Δ d to need to carry out difference correction;
C) as c>0, d is made
1-Δ d exports as current output valve; As c<0 d in season
1+ Δ d exports as output valve.
Described step 4) in triggering mode for setting the triggered time, this triggered time be greater than gauge head turnover the groove time used, in given triggering intervals, contrast search measurement data characteristic value.
Described step 4) in triggering mode be start pulse signal, the cycle that the external world sends pulse to measuring and controlling instrument is greater than the gauge head turnover groove time used, after receiving trigger impulse, between two rising edge of a pulses, the characteristic value of contrast search measurement data.
Described step 4) in triggering mode for setting trigger size, when measured value is greater than given triggering size value, contrast search measurement data characteristic value; When measured value is less than given triggering size value, reset, namely characteristic value resets, and again contrasts the characteristic value of search measurement data from reduction point.
Described characteristic value comprises maximum, minimum of a value and P-P value, and wherein maximum exports as the maximum in the same period, is generally used for outside diameter measuring; Minimum of a value exports as the minimum of a value in the same period, is generally used for inner diameter measurement; P-P value is export the difference in the same period between maximum and minimum of a value, is generally used for the form error of examining workpieces after machining.
The invention has the beneficial effects as follows: the present invention by having discontinuous surface feature according to slewing parts and grinding state sets corresponding parameter before grinding, and parameter is preserved in a database, when the gauge head turnover piece surface groove of sensing device, can according to the groove on slewing parts to be processed be whether periodic distribution select on the side face of part interrupted revised law and the same period feature compensation method, automatic data correction and compensation deals are carried out to the measurement size value of sudden change, thus make the part with discontinuous surface feature in Grinding Process, avoid the action erroneous judgement of measuring and controlling instrument, cause the problem of grinding processing interruption, improve accuracy and the reliability of on-line measurement in grinding simultaneously.
Accompanying drawing explanation
Fig. 1 is the on-line measurement schematic diagram of discontinuous surface characteristic part;
Fig. 2 is interrupted revised law principle schematic;
Fig. 3 is interrupted revised law sensing device magnitude of voltage change line schematic diagram;
Fig. 4 mends principle to repay schematic diagram the inner same period;
Fig. 5 is automatic paralleling compensation principle schematic diagram;
Fig. 6 compensates start pulse signal schematic diagram the outside same period.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.
In order to improve the technological progress of China's mill processing Active measuring, overcome the difficult point of discontinuous surface active measurement technology, we are studied the key technology of discontinuous surface on-line measurement, explore measurement type and the Implementation Technology of the on-line measurement of mill processing discontinuous surface, on the software and hardware Research foundation of original mill processing Active measuring controller, final formation can realize the new method of carrying out grinding processing on-line measurement to discontinuous surface.
The technological difficulties that discontinuous surface is measured are the sudden change that gauge head all can cause measurement size when entering piece surface groove (such as keyway, gear grooved) and mark groove.Size sudden change can affect the certainty of measurement of Active measuring controller on the one hand, if do not carry out the data processing of being correlated with on the other hand, the action of controller can be caused to judge by accident, cause on-line measurement to be lost efficacy.
For this reason, the invention provides a kind of grinding processing method with discontinuous surface characteristic part, the step of this grinding processing method is as follows:
1. before grinding, set corresponding parameter according to the discontinuous surface feature of slewing parts and grinding state, described parameter comprises corase grind, fine grinding, tarry matter, to the signaling point that size grinding state is corresponding, and grinding wheel speed, emery wheel feed speed and workpiece rotational frequency, and this parameter is preserved in a database, slewing parts to be processed is arranged on grinding machine and carries out grinding, judge whether the groove on slewing parts to be processed is that periodic distribution is in the circumference of part, if not periodic distribution, then enter step 2, by interrupted revised law, measurement data is processed, if periodic distribution, then enter step 3, by the feature compensation method same period, measurement data is processed.
2. when gauge head turnover groove, workpiece size generation Rapid Variable Design, the measurement data of inside grooves is invalid data, to the calculating of measurement result without in all senses, during normal mill processing on-line measurement (to measure external diameter), its change in size line should linearly successively decrease change, therefore, the size changing value in groove is modified to the size changing value of normal process by the method that can be compensated by difference, as shown in Figure 2.
In on-line measurement process, general sensing device continuous acquisition n secondary data also, after carrying out average filter, as once result output, sets and gathers n secondary data required time t
vit is a sampling period.When grinding state and condition constant, a sampling period workpiece size changing value should be Δ d, and corresponding sensing device magnitude of voltage is changed to Δ u
v, namely after each sampling period, the variable quantity of workpiece size is equal.As shown in Figure 3, the slope of voltage change line that sensing device records is:
Wherein t
1for setting-up time, its value is determined by on-the-spot grinding situation, is located at t
1the voltage change that in time period, sensing device detects is Δ u
1; If the multiplier value of sensing device is K, the pass between size changing value and magnitude of voltage is:
Δ d=K × Δ u
v(2) can show that in the sampling period under certain processing conditions, workpiece size variable quantity is:
Δd＝Δu
1×t
v×K/t
1(3)
Implementation step is as follows:
1) a sampling period inside dimension change theoretical value Δ d is calculated, if the actual size value recorded of current sensor device is d
2, last time, size output valve was d
1, make c=d
2-d
1;
2) absolute value of c and Δ d are compared, when | then judge during c| >=Δ d to need to carry out difference correction;
3) as c>0, d is made
1-Δ d exports as current output valve; As c<0 d in season
1+ Δ d exports as output valve.
When complete above-mentioned size changing value in groove is modified to the size changing value of normal process after, enter step 4.
3. due in the same grinding stage (as corase grind, fine grinding, tarry matter), workpiece rotational frequency, grinding wheel speed, probe location are constant, the time of gauge head turnover groove is certain, therefore, can from gauge head enters groove, mark groove part to gauge head to terminate, the insignificant size changing value that this period obtains does not carry out any process and output, but according to selected firing control, in during search trigger, the characteristic value of (hereinafter referred to as the same period) is as corresponding Output rusults.
Be divided into according to triggering mode difference: the inner same period, automatic paralleling, the outside Three models same period, simultaneously, according to the difference of functional requirement, three kinds of data output types can be selected: maximum exports, minimum of a value exports and P-P value exports under often kind of pattern, wherein maximum exports as the maximum in the same period, is generally used for outside diameter measuring; Minimum of a value exports the minimum of a value for the same period, is generally used for inner diameter measurement; P-P value exports the difference for exporting in the same period between maximum and minimum of a value, is generally used for the form error of examining workpieces after machining.Its detailed process is as follows:
When adopting the inner same period, the setting triggered time, triggered time is greater than the gauge head turnover groove time used, as shown in Figure 4, the contrast of measurement data is carried out in this triggered time section, search characteristics value, in given triggering intervals, the characteristic value of measurement data is searched in contrast, is compensated to substitute to export as measurement result by one of functional requirement selection characteristic value, when measuring external diameter, exporting maximum, when measuring internal diameter, exporting minimum of a value, when form error for examining workpieces, export P-P value; The process control of activation period reduces by a sampling period realization by the triggered time at every turn.
When adopting the outside same period, receive outside lathe start pulse signal, as shown in Figure 6, be spaced apart pulse-triggered cycle T between two trigger impulse rising edges, within this cycle, then carry out the contrast of measurement data, search characteristics value, and the output of measurement result is carried out at second rising edge of a pulse place, otherwise do not carry out any operation, iterative cycles like this performs.
When adopting automatic paralleling, setting triggers size, when measured value is greater than given triggering size value, the characteristic value of contrast search measurement data, and select one of characteristic value to export by functional requirement, when measured value is less than given triggering size value, triggering collection resets, restart the characteristic value of search measurement data and export, trigger size and be generally set as-50 μm, the position of automatic paralleling further groove should as a reduction point, reach reduction point, characteristic value is reset, restart search characteristics value, as shown in Figure 5, this triggering mode is more suitable for the more part of groove number.
4. result step 2 or step 3 exported is as measurement result, thus control grinding machine uninterruptedly carries out grinding to slewing parts to be processed, until this part completes grinding process.
Claims (6)
1. there is a grinding processing method for discontinuous surface characteristic part, it is characterized in that: the step of this grinding processing method is as follows:
1) before grinding, set corresponding parameter according to the discontinuous surface feature of slewing parts and grinding state, and parameter is preserved in a database;
2) slewing parts to be processed is arranged on grinding machine carries out grinding, judge whether the groove on slewing parts to be processed is that periodic distribution is in the circumference of part, if not periodic distribution, then enter step 3), by interrupted revised law, measurement data is processed; If periodic distribution, then enter step 4), by the feature compensation method same period, measurement data is processed; Thus make the part with discontinuous surface feature in Grinding Process, avoid the action erroneous judgement of measuring and controlling instrument;
3) described interrupted revised law is impartial according to the grinding variable quantity of accessory size after each sampling period, accessory size variable quantity and desired cut amount are contrasted, when sensing device gauge head turnover keyway causes size to suddenly change, this size changing amount is directly modified to theoretical size variable quantity to export, enters step 5);
4) described same period, feature compensation method was according to certain by the time of grinding stage gauge head turnover groove, the triggering mode of gauge head turnover groove is set, after triggering, by gauge head, the measurement data passed in and out in the groove part time period is cast out, search for the characteristic value in the same period simultaneously according to triggering mode difference, characteristic value is substituted as compensation and exports;
5) using step 3) or step 4) result that exports is as measurement result, measuring and controlling instrument judges whether to reach setting grinding state according to this measurement result, thus control grinding machine uninterruptedly carries out grinding to slewing parts to be processed, until this part completes whole grinding process.
2. the grinding processing method with discontinuous surface characteristic part according to claim 1, is characterized in that: described step 3) in that the size changing amount that sensing device is measured directly is modified to the process of theoretical size variable quantity is as follows:
A) slewing parts grinding change in size theoretical value Δ d to be processed in the sampling period is calculated, if the actual size value recorded of current sensor device is d
2, last time, size output valve was d
1, make c=d
2-d
1;
B) absolute value of c and Δ d are compared, when | then judge during c| >=Δ d to need to carry out difference correction;
C) as c>0, d is made
1-Δ d exports as current output valve; As c<0 d in season
1+ Δ d exports as output valve.
3. the grinding processing method with discontinuous surface characteristic part according to claim 2, it is characterized in that: described step 4) in triggering mode for setting the triggered time, this triggered time is greater than the gauge head turnover groove time used, in given triggering intervals, the characteristic value of contrast search measurement data.
4. the grinding processing method with discontinuous surface characteristic part according to claim 2, it is characterized in that: described step 4) in triggering mode be start pulse signal, the cycle that the external world sends pulse to measuring and controlling instrument is greater than the gauge head turnover groove time used, after receiving trigger impulse, between two rising edge of a pulses, the characteristic value of contrast search measurement data.
5. the grinding processing method with discontinuous surface characteristic part according to claim 2, it is characterized in that: described step 4) in triggering mode for setting trigger size, when measured value is greater than given triggering size value, the characteristic value of contrast search measurement data; When measured value is less than given triggering size value, reset, namely characteristic value resets, and again contrasts the characteristic value of search measurement data from reduction point.
6. the grinding processing method with discontinuous surface characteristic part according to claim 3,4 or 5, it is characterized in that: described characteristic value comprises maximum, minimum of a value and P-P value, wherein maximum exports as the maximum in the same period, is generally used for outside diameter measuring; Minimum of a value exports as the minimum of a value in the same period, is generally used for inner diameter measurement; P-P value is export the difference in the same period between maximum and minimum of a value, is generally used for the form error of examining workpieces after machining.
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| CN103075920B true CN103075920B (en) | 2015-02-25 |
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| US3887857A (en) * | 1973-11-19 | 1975-06-03 | Inductosyn Corp | Measuring apparatus for machine tool systems |
| DD155690A3 (en) * | 1980-07-10 | 1982-06-30 | Manfred Haustein | ARRANGEMENT OF A MEASUREMENT CONTROL UNIT ON ROUND GRINDING MACHINES |
| WO2002091089A1 (en) * | 2001-04-27 | 2002-11-14 | Citizen Watch Co., Ltd. | Automatic lathe, method for controlling the same, and device for controlling the same |
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Application publication date: 20130501 Assignee: SANMENXIA ZHONGYUAN PRECISION CO., LTD. Assignor: Zhengzhou University Contract record no.: 2015410000046 Denomination of invention: Grinding processing method of parts with discontinuous surface features Granted publication date: 20150225 License type: Exclusive License Record date: 20150602 |
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