JP2009034783A - Inner face grinding pattern setting device, inner face grinding device, inner face grinding pattern setting method, and inner face grinding method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inner face grinding pattern setting device for controlling a tapered amount with high accuracy during machining while adding a correction parameter such as the diameter of a grinding wheel or a machining frequency after dressing and then adjusting a reciprocating movement range without measuring the tapered amount until a new grinding wheel ends its life. <P>SOLUTION: The inner face grinding pattern setting device 130 is provided for setting the reciprocating movement range of the grinding wheel T of an inner face grinding device 10 which uses the grinding wheel T for grinding the inner face of a machined hole Wa of a work W. It comprises a control part 100 for inputting the reciprocating movement range of the grinding wheel T, detecting a change of the tapered amount after dressing the grinding wheel T with test machining, correcting at least one of the correction amount of the reciprocating movement range, the frequency of the correction, and the frequency of the correction after dressing, detecting a change of the tapered amount when the outer diameter of the grinding wheel T is changed with test machining, and correcting at least one of the correction amount of the reciprocating movement range, the frequency of the correction, and the outer diameter side of the grinding wheel to be corrected. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an inner surface grinding pattern setting device, an inner surface grinding device, an inner surface grinding pattern setting method, an inner surface grinding method, and a program for performing inner diameter machining of holes, and in particular, to a technology capable of machining a large number of workpieces with high accuracy and efficiency. .

  For example, an internal grinding device used when forming a round hole in a metal workpiece is known. The inner surface grinding apparatus is an apparatus that widens the inner diameter while grinding a guide hole provided in advance with a cylindrical grindstone, and finishes the processing when a desired inner diameter is reached. Some products require a particularly high degree of cylindricity (small taper amount), but internal grinding uses a mechanism with low rigidity. For example, the shape of the grindstone can be changed to a tapered shape, Methods such as turning, turning of the grinding wheel shaft, and changing the oscillation speed and position are taken (for example, see Patent Documents 1 to 3).

  On the other hand, the grindstone tends to be sharper as the outer diameter becomes smaller. Also, the grindstone is regularly dressed on the surface, but the sharpness is poor immediately after this dressing, and the sharpness tends to increase as it is processed. Further, the machining efficiency varies depending on the machining conditions such as the thermal condition generated by the friction between the grinding wheel and the workpiece.

  In order to maintain a constant taper amount in such a situation that the machining conditions change in a complicated manner, it is necessary to adjust the machining conditions such as the reciprocating range of the grindstone. For example, it is conceivable to measure the taper amount of a workpiece after machining several pieces, and change the machining conditions when a defective product out of the allowable range appears. However, the yield was poor due to defective products. In addition, the machining conditions must be changed depending on the experience and intuition of the operator, and grinding under optimum machining conditions has not always been possible. Furthermore, since the machining operation is stopped every time the machining conditions are changed, it cannot be automated and the production efficiency is poor.

On the other hand, it is conceivable to automatically insert a probe into a workpiece during processing, measure the taper amount, adjust the reciprocating range by applying feedback, and control the taper amount (in-process control).
Japanese Patent Publication No. 07-009784 Japanese Patent Laid-Open No. 08-281540 Japanese Patent No. 3345910

  The above-described inner surface grinding apparatus has the following problems. That is, in-process control can automatically control the taper amount, but it takes time for measurement and may increase the overall processing time.

  Therefore, the present invention adjusts the reciprocating range without taking the taper amount measurement and taking into account correction parameters such as the grinding wheel diameter and the number of times of machining from the time of dressing until the new grinding wheel has finished its life, An object of the present invention is to provide an internal grinding pattern setting device, an internal grinding device, an internal grinding pattern setting method, an internal grinding method, and a program capable of performing processing with a taper amount controlled with high accuracy.

  In order to solve the above problems and achieve the object, the internal grinding pattern setting device, internal grinding device, internal grinding pattern setting method, internal grinding method and program of the present invention are configured as follows.

  In an internal grinding pattern setting device for setting a reciprocating range of the grinding wheel in an internal grinding device for grinding an inner surface of a processing hole provided in a workpiece using a grinding wheel, an input unit for inputting the reciprocating range of the grinding wheel And a dress change detection unit for detecting a taper amount change after dressing the grinding wheel by performing a test process, and a correction amount of the reciprocating range and the number of corrections based on a detection result of the dress change detection unit. A dress change correction unit that corrects at least one of the number of times after dressing to perform correction, and an outer diameter change detection unit that detects a taper amount change when the outer diameter of the grinding wheel is changed by performing test processing; And an outer diameter change correction unit that corrects at least one of the correction amount of the reciprocating range, the number of corrections, and the outer diameter of the grindstone to be corrected based on the detection result of the outer diameter change detection unit. And said that you are.

  According to the present invention, the taper amount is not measured until the new grinding wheel has finished its life, and the reciprocation range is adjusted in consideration of correction parameters such as the grinding wheel diameter and the number of times of machining since dressing. Thus, it is possible to perform processing with a controlled taper amount with high accuracy.

  FIG. 1 is a cross-sectional view schematically showing an internal grinding device 10 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the positional relationship between a grinding wheel T and a workpiece W in the internal grinding device 10. In the figure, W represents a workpiece to be machined using the internal grinding apparatus 10, Wa represents a machining hole provided in the workpiece W, and T represents a grinding wheel. In the internal grinding device 10, it is assumed that the grinding wheel T has a lifetime by performing internal grinding of, for example, a processing hole Wa having an inner diameter of 3 mm of 400 workpieces W with one grinding wheel T.

  The inner surface grinding device 10 is arranged to support the workpiece W and rotate in the direction R1 in FIG. 1 and the support rotation mechanism 20, and supports the grinding wheel T via the quill K. A rotational drive mechanism 30 that slides on the inner surface of the processing hole Wa in the direction R2 in FIG. 1 and slides the outer peripheral surface thereof, and the rotational drive mechanism 30 reciprocates (oscillates) in the axial direction. Is provided with a linear motion drive mechanism 40 that reciprocates along the axial direction of the machining hole Wa, and a control unit 100 that controls the support rotation mechanism 20, the rotation drive mechanism 30, and the linear motion drive mechanism 40 in an associated manner.

  The control unit 100 drives the support rotation mechanism 20, the rotation drive mechanism 30, and the linear motion drive mechanism 40 according to the various processing conditions read from the memory 110 and various processing conditions input from the outside. A driving unit 120 and an internal grinding pattern setting device 130 for setting various processing conditions for inputting to the memory 110 are provided.

  The internal grinding pattern setting device 130 includes a pattern memory 131 in which machining conditions are stored, a setting control unit 132 for performing trial grinding and setting, and a correction unit 133 for correcting the machining conditions. The setting control unit 132 is loaded with a program for obtaining an internal grinding pattern.

  In the internal grinding apparatus 10 configured as described above, the internal grinding pattern is first optimized, and after the optimized internal grinding pattern is set in the pattern memory 131, the internal grinding is performed based on the internal grinding pattern. The internal grinding apparatus 10 performs optimization using the number of times of processing from the dress (shaping and shaping of the grinding wheel T) and the outer diameter of the grinding wheel T as parameters. Further, the reciprocating range L of the grinding wheel T is defined by determining the forward end position since the reciprocating amount is constant (see FIG. 2).

内面研削パターンの最適化は、設定用制御部１３２に読み込まれたプログラムからの指令により図３及び図４に示すフローにしたがって行われる。最初に加工精度調整を行う（ＳＴ１０）。加工精度の調整は、加工条件、ドレス条件、砥石選択等を過去の加工実績等に基づいて行う。次に、ワークＷのテーパ量が許容範囲内となるような初期の往復動範囲Ｌを過去の加工実績等に基づいて設定する（ＳＴ１１）。 The wheel diameter rank switching point parameters A to I are arbitrarily determined in advance.

The optimization of the internal grinding pattern is performed according to the flow shown in FIGS. 3 and 4 according to a command from the program read into the setting control unit 132. First, the machining accuracy is adjusted (ST10). The adjustment of the processing accuracy is performed based on past processing results and the like, such as processing conditions, dress conditions, and grindstone selection. Next, an initial reciprocating range L in which the taper amount of the workpiece W is within the allowable range is set based on past machining results (ST11).

  Next, the first preliminary test processing is performed under the set conditions (ST12). In the first preliminary test machining, N workpieces W are ground according to a preset dressing interval (the number N of workpieces from dressing to the next dressing), and the machining accuracy and taper amount Are collected (ST12). Here, the machining accuracy and the degree of change in the taper amount are confirmed (ST13), and if the machining accuracy is outside the allowable range, the process returns to ST10. Further, if the machining accuracy is within an allowable range and the degree of change in the taper amount is equal to or less than the reference value, the number of machinings from the dress does not become a parameter, so the process proceeds to ST20 described later. Further, if the machining accuracy is within an allowable range and the change degree of the taper amount is equal to or greater than the reference value, the first test machining is performed (ST14).

このようにして補正切替点パラメータα１〜α５を定め、この補正切替点パラメータα１〜α５に基づいて、第１次予備試験加工と同様の第１次確認試験加工を行ってデータを採取し（ＳＴ１５）、テーパ量の変化度が改善されたか否かを確認する（ＳＴ１６）。図５は補正を行わない場合の加工個数とテーパ量との関係を示すグラフである。ドレスは１８個おきに行っている。図６は補正を行った場合の加工個数とテーパ量との関係を示すグラフである。図６に示すように補正切替点パラメータα１〜α５に基づいて補正を行ったことでテーパ量が改善されていればＳＴ２０に進み、改善されていなければＳＴ１４に戻る。 In the first test processing, optimum correction switching point parameters α1 to α5 are determined based on the degree of change in the taper amount after dressing. The correction switching point parameters α1 to α5 are correction points (the number of processed parts after dressing). For example, the following correction switching point parameters α1 to α5 are obtained. Here, no. 1 indicates the first processing after dressing. The correction unit 133 corrects the machining conditions based on the obtained correction switching point parameters α1 to α5.

In this way, the correction switching point parameters α1 to α5 are determined, and based on the correction switching point parameters α1 to α5, the first confirmation test machining similar to the first preliminary test machining is performed to collect data (ST15). ), It is confirmed whether or not the degree of change in the taper amount has been improved (ST16). FIG. 5 is a graph showing the relationship between the number of processing and the taper amount when correction is not performed. Every 18 dresses. FIG. 6 is a graph showing the relationship between the number of processing and the taper amount when correction is performed. As shown in FIG. 6, if the taper amount is improved by performing correction based on the correction switching point parameters α1 to α5, the process proceeds to ST20, and if not improved, the process returns to ST14.

  In the second preliminary test processing, the workpiece W is ground with the grinding wheel T having at least three types of grinding wheel diameters, and data of processing accuracy and taper amount are collected (ST20). The three types of grindstone diameters are, for example, those having the maximum grindstone diameter, the minimum grindstone diameter, and the intermediate grindstone diameter.

  Here, the processing accuracy and the change degree of the taper amount are confirmed (ST21), and if the change amount of the taper amount is equal to or less than the reference value, the process ends. Further, if the degree of change in the taper amount is equal to or greater than the reference value, the second test processing is performed (ST22).

  In the second test machining, an optimum reciprocating position correction value is determined based on the degree of change in the taper amount due to the change in the grindstone diameter.

  The reciprocating position correction value is calculated by the correction unit 133 according to the combination of the switching point parameters α1 to α5 and the grindstone diameter rank switching point parameter.

  Based on the wheel diameter rank switching point parameter described above, the second confirmation test processing similar to the second preliminary test processing is performed to collect data (ST23), and whether or not the degree of change in the taper amount has been improved. Confirm (ST24). If not improved, the process returns to ST22, and if improved, the process proceeds to ST30.

第１次試験加工及び第２次試験加工によって得られた往復動位置補正値が含まれる内面研削パターンをパターンメモリ１３１に記憶させる（ＳＴ３０）。 Finally, reciprocating position correction values based on the correction switching point parameters α1 to α5 and the wheel diameter rank switching point parameters A to I are obtained as an internal grinding pattern as follows.

The internal grinding pattern including the reciprocating position correction value obtained by the first test process and the second test process is stored in the pattern memory 131 (ST30).

  Next, internal grinding for producing a workpiece W as a product is performed. The internal grinding pattern is read from the pattern memory 131 into the memory 110. Thereby, the internal grinding pattern in which various processing conditions are optimized as described above is set. Then, the support rotation mechanism 20, the rotation drive mechanism 30, and the linear motion drive mechanism 40 are driven according to various processing conditions read from the memory 110.

  When the drive is started, the reciprocating range L is automatically adjusted based on the reciprocating position correction value according to the reciprocating range, the number of times from the dress, the grindstone diameter, etc., and the grinding wheel T is minimized from the maximum outer diameter. Grinding can be performed without measuring the processing accuracy, the degree of change in taper amount, etc. in-process until the outer diameter is reached. For this reason, processing time can be shortened.

  As described above, according to the inner surface grinding apparatus 10 according to the present embodiment, attention should be paid to the relationship between the grindstone diameter and the number of times from the dress and the sharpness of the grindstone in order to make the change amount of the taper amount equal to or less than the reference value. Thus, continuous machining is possible while ensuring stable taper accuracy.

  In the present embodiment, the taper amount change degree according to the number of times from dressing is set first, and then the taper amount change degree according to the outer diameter of the grindstone is set. However, the reverse procedure may be used. Moreover, you may set only one side. Further, if there is another factor that gives the degree of change in taper amount, it may be set by adjusting.

  The present invention is not limited to the above embodiment. Of course, various modifications can be made without departing from the scope of the present invention.

FIG. 1 is an explanatory view schematically showing a configuration of an internal grinding apparatus according to an embodiment of the present invention with a partial cross section. Sectional drawing which shows the positional relationship of the grinding wheel and workpiece | work in the same internal grinding apparatus. Explanatory drawing which shows the 1st step of the internal grinding pattern setting flow of the internal grinding pattern setting apparatus incorporated in the internal grinding apparatus. Explanatory drawing which shows the 2nd step of the same inner surface grinding pattern setting flow. The graph which shows the taper change amount degree before correction | amendment. The graph which shows the taper variation | change_quantity degree after correction | amendment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Internal grinding apparatus, 100 ... Control part, 130 ... Internal grinding pattern setting apparatus, 131 ... Pattern memory, 132 ... Setting control part, 133 ... Correction part, T ... Grinding wheel, W ... Work, Wa ... Work hole, K ... Quill.

Claims (6)

In the internal grinding pattern setting device for setting the reciprocating range of the grinding wheel in the internal grinding device that grinds the inner surface of the processing hole provided in the workpiece using a grinding wheel,
An input unit for inputting a reciprocating range of the grinding wheel;
A dress change detector for detecting a taper amount change after dressing the grinding wheel by performing test processing;
Based on the detection result of the dress change detection unit, a dress change correction unit that corrects at least one of the correction amount of the reciprocating range, the number of corrections, and the number of times after dressing to be corrected;
An outer diameter change detection unit for detecting a taper amount change when the outer diameter of the grinding wheel is changed by performing test processing;
Based on the detection result of the outer diameter change detection unit, an outer diameter change correction unit that corrects at least one of the correction amount of the reciprocating range, the number of corrections, and the outer diameter of the grindstone to be corrected is provided. An internal grinding pattern setting device. In the internal grinding device that grinds the inner surface of the machining hole provided in the workpiece,
A grinding wheel inserted into the machining hole;
A rotational drive mechanism for sliding the grinding wheel on the inner surface of the processing hole;
A linear drive mechanism for reciprocating the grinding wheel along the axial direction of the processing hole;
A control unit for controlling a reciprocating range in the axial direction of the grinding wheel,
An internal grinding device, wherein the control unit is provided with an internal grinding pattern setting unit in which an internal grinding pattern determined based on at least one processing condition is set. The internal grinding part is
An input unit for inputting a reciprocating range of the grinding wheel;
A dress change detector for detecting a taper amount change after dressing the grinding wheel by performing test processing;
Based on the detection result of the dress change detection unit, a dress change correction unit that corrects at least one of the correction amount of the reciprocating range, the number of corrections, and the number of times after dressing to be corrected;
An outer diameter change detection unit for detecting a taper amount change when the outer diameter of the grinding wheel is changed by performing test processing;
Based on the detection result of the outer diameter change detection unit, an outer diameter change correction unit that corrects at least one of the correction amount of the reciprocating range, the number of corrections, and the outer diameter of the grindstone to be corrected is provided. The internal grinding apparatus according to claim 2, wherein: In the inner surface grinding pattern setting method for setting the reciprocating range of the grinding wheel in the inner surface grinding apparatus for grinding the inner surface of the processing hole provided in the workpiece using a grinding wheel,
Inputting the reciprocating range of the grinding wheel;
A step of detecting a taper amount change after dressing the grinding wheel by performing test processing;
A step of correcting at least one of the correction amount of the reciprocating range, the number of corrections, and the number of times after dressing to perform correction based on the detection result of the taper amount change;
Detecting the taper amount change when the outer diameter of the grinding wheel is changed by performing test processing;
A step of correcting at least one of the correction amount of the reciprocating range, the number of corrections, and the outer diameter of the grindstone to be corrected based on the detection result of the taper amount change. Grinding pattern setting method. In the inner surface grinding method of grinding the inner surface of the processing hole provided in the workpiece with a grinding wheel,
Inputting the reciprocating range of the grinding wheel;
A step of detecting a taper amount change after dressing the grinding wheel by performing test processing;
A step of correcting at least one of the correction amount of the reciprocating range, the number of corrections, and the number of times after dressing to perform correction based on the detection result of the taper amount change;
Detecting the taper amount change when the outer diameter of the grinding wheel is changed by performing test processing;
A step of correcting at least one of the correction amount of the reciprocating range, the number of corrections, and the outer diameter of the grindstone to be corrected based on the detection result of the taper amount change;
Storing the internal grinding pattern obtained by this process;
And a step of performing internal grinding with the grinding wheel based on the stored internal grinding pattern. In a program for operating a computer,
In an inner surface grinding pattern setting device for setting a reciprocating range of the grinding wheel in an inner surface grinding device for grinding using a grinding wheel,
An input means for inputting a reciprocating range of a grinding wheel for grinding an inner surface of a machining hole provided in a workpiece;
Dress change detection means for detecting a taper amount change after dressing the grinding wheel by performing test processing;
Dress change correction means for correcting at least one of the correction amount of the reciprocating range, the number of corrections, and the number of times after dressing to be corrected based on the detection result of the taper amount change,
An outer diameter change detecting means for detecting a taper amount change when the outer diameter of the grinding wheel is changed by performing test processing;
An outer diameter change correcting means for correcting at least one of the correction amount of the reciprocating range, the number of corrections, and the outer diameter of the grindstone to be corrected based on the detection result of the taper amount change. A featured program.

Images