Honing control device, honing device including the same, and honing method

Abstract

To provide a honing processing control device which enables improvement of processing accuracy of an inner surface of a processed hole, and to provide a honing processing device including the honing processing control device and a honing processing method.SOLUTION: A honing processing control device 9 performs honing processing to an inner surface 3a of a processed hole 3 of a workpiece 2 by rotation and reciprocating motion in an axial direction of a honing head 4 having a grind stone 4a at an outer part. The honing processing control device 9 includes controlling means 10 which enables controlling to perform variable speed cutting, in which at least one of a reciprocation speed and a rotation speed of the honing head 4 is changed in a predetermined cutting range of the processed hole 3, when the honing head 4 is reciprocated.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a honing control device that hones the inner surface of a hole in a workpiece by rotating and axially reciprocating a honing head having a grinding stone on the outer side, a honing device equipped with the same, and a honing method. [Background technology]

[0002] In the operation of honing the inner surface of a hole to be machined in a workpiece, the hone head to which the grinding stone is attached is rotated and moved up and down reciprocally to grind the inner surface of the workpiece.

[0003] In the case of a workpiece with a through hole, it is possible to machine a clean cylindrical inner diameter by moving the hone head back and forth at a constant speed over a distance set to exceed the depth of the hole.

[0004] On the other hand, when the workpiece is a blind hole with a bottom, if the hone head is moved back and forth at a constant speed within a range that does not contact the bottom of the blind hole, the machined shape will be such that the bottom side is not machined. Therefore, conventionally, a method called dwell cutting is used, in which the hone head stops its reciprocating motion on the bottom side for a certain period of time, or a method called partial cutting is used, in which the hone head moves back and forth in short increments within a set range on the bottom side, to increase the contact time between the grinding wheel and the inner surface of the bottom side of the hole, which is difficult to machine, and machine it into a cylindrical inner shape. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2009-12163 A (page 9) Summary of the Invention [Problem to be solved by the invention]

[0006] However, if the reciprocating motion of the hone head is stopped or only partially operated, machining will occur in areas of the inner surface of the hole that you do not want to machine, making it difficult to machine a clean cylindrical shape.

[0007] The present invention has been made in consideration of the above points, and aims to provide a honing control device that can improve the machining accuracy of the inner surface of a hole to be machined, a honing device equipped with the same, and a honing method. [Means for solving the problem]

[0008] The honing control device described in claim 1 is a honing control device that hones the inner surface of a hole to be machined in a workpiece by rotating a honing head having a grindstone on its outer side and reciprocating the honing head in the axial direction, and is equipped with a control means that can control at least one of the reciprocating speed and rotational speed of the honing head when reciprocating the honing head so as to perform variable speed cutting, which changes the reciprocating speed and rotational speed of the honing head within a predetermined cutting range set according to the cutting efficiency of the inner surface of the hole to be machined. The control means can control the honing head to perform constant speed cutting by making the reciprocating speed and rotation speed of the honing head constant when the honing head is reciprocated, and can set the balance of the number of times the constant speed cutting and the variable speed cutting are performed for one of the workpiece holes. It is something 。

[0009] Claim 2 The honing device described in the present invention comprises a honing head having a grinding stone on its outer surface and capable of rotating and reciprocating in an axial direction; 1 and the honing control device described above.

[0010] Claim 3 The honing method described is a honing method for honing the inner surface of a hole to be machined in a workpiece by rotating a honing head having a grinding stone on the outer side and reciprocating the honing head in the axial direction, and is a variable speed cutting method in which at least one of the reciprocating speed and rotational speed of the honing head is changed within a predetermined cutting range set according to the cutting efficiency of the inner surface of the hole to be machined during the reciprocating movement of the honing head. and constant speed cutting in which the honing head is reciprocated while the reciprocating speed and rotation speed of the honing head are kept constant. It is to be implemented 。 [Effects of the Invention]

[0011] According to the present invention, the machining accuracy of the inner surface of the hole to be machined can be improved. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a system configuration diagram of a honing device according to an embodiment. FIG. [Figure 2] (a) is a schematic diagram showing the case where the machined hole in the workpiece has a bottom surface, (b) is a graph showing the reciprocating position and rotational speed of the honing head when performing variable reciprocating speed cutting for (a), and (c) is a graph showing the reciprocating position and rotational speed of the honing head when performing variable rotational speed cutting for (a). [Figure 3] (a) is a schematic diagram showing a case where the material of part of the machined hole in the workpiece is different, (b) is a graph showing the reciprocating position and rotational speed of the honing head when performing variable reciprocating speed cutting for (a), and (c) is a graph showing the reciprocating position and rotational speed of the honing head when performing variable rotational speed cutting for (a). [Figure 4] Graph (a) shows the reciprocating position and rotational speed of the honing head when only variable reciprocating speed cutting is performed, graph (b) shows the reciprocating position and rotational speed of the honing head when variable reciprocating speed cutting and constant speed cutting are performed alternately, and graph (c) shows the reciprocating position and rotational speed of the honing head when variable reciprocating speed cutting and constant speed cutting are performed a predetermined number of times. [Figure 5] Graph (a) shows the reciprocating position and rotational speed of the honing head when only variable rotational speed cutting is performed, graph (b) shows the reciprocating position and rotational speed of the honing head when variable rotational speed cutting and constant speed cutting are performed alternately, and graph (c) shows the reciprocating position and rotational speed of the honing head when variable rotational speed cutting and constant speed cutting are performed a predetermined number of times. DETAILED DESCRIPTION OF THE INVENTION

[0013] An embodiment of the present invention will be described with reference to the drawings.

[0014] In FIG. 1, reference numeral 1 denotes a honing device. Honing device 1 grinds the inner surface 3a, which is the workpiece surface, of hole 3 formed in workpiece 2, which is the material to be cut. Honing device 1 is equipped with a honing head 4 that is inserted into hole 3. A grinding stone 4a is attached to the outer portion of honing head 4. Grinding stone 4a is pressed against the inner surface 3a of hole 3 to grind the inner surface 3a. Honing head 4 is attached to shaft 5. Honing head 4 reciprocates due to reciprocating motor 6, which serves as a reciprocating drive means. In this embodiment, honing head 4 moves up and down due to reciprocating motor 6. The reciprocating position of honing head 4 is detected by position detection means 7, such as a sensor. That is, in this embodiment, the up and down position of honing head 4 is detected by position detection means 7. Furthermore, honing head 4 is rotated together with shaft 5 by rotary motor 8, which serves as a rotary drive means.

[0015] The reciprocating motor 6, position detection means 7, and rotation motor 8 are electrically connected to a honing control device 9. The honing control device 9 includes control means 10. The control means 10 receives information on the position of the honing head 4 detected by the position detection means 7, and outputs signals to control the reciprocating motor 6 and the rotation motor 8, respectively.

[0016] The control means 10 controls the reciprocating motor 6 and the rotary motor 8 in accordance with the reciprocating position of the honing head 4 detected by the position detection means 7. Then, the control means 10 causes the rotation of the honing head 4 and the reciprocating movement in the axial direction to perform honing on the inner surface 3a of the machined hole 3 in the workpiece 2.

[0017] In this embodiment, the control means 10 is capable of controlling the honing head 4 to perform variable speed cutting, in which at least one of the reciprocating speed and rotational speed of the honing head 4 is changed within a predetermined cutting range R of the hole 3 to be machined. In other words, the control means 10 is capable of variably controlling at least one of the reciprocating speed and rotational speed of the honing head 4 so that the contact time between the inner surface 3a of the hole 3 to be machined and the grinding wheel 4a is made different from that in other cutting ranges of the hole 3 to be machined, within the predetermined cutting range R between the upper cutting limit T and lower cutting limit B of the hole 3 to be machined.

[0018] The cutting range R is set according to the shape, type or characteristics of the workpiece 2 (machined hole 3), such as rigidity, material or properties. In other words, the cutting range R is set according to the cutting efficiency of the inner surface 3a of the machined hole 3. In other words, when the machined hole 3 is formed across parts of the workpiece 2 with different rigidities, the control means 10 can vary at least one of the reciprocating speed and rotational speed of the honing head 4 according to the different cutting efficiencies for each of the different rigidities.

[0019] For example, the control means 10 shortens or lengthens the contact time by controlling the reciprocating speed of the honing head 4 so that it is faster or slower in the predetermined cutting range R than in other cutting ranges (variable reciprocating speed cutting). In particular, in this embodiment, the control means 10 gradually changes the reciprocating speed of the honing head 4 even in the predetermined cutting range R.

[0020] As an example of variable reciprocating speed cutting, the control means 10 controls the reciprocating speed of the honing head 4 for a hole 3 to be machined, which has a bottom surface 3b, as shown in Figure 2(a) so that the reciprocating speed becomes slower the closer to the bottom surface 3b within a predetermined cutting range R on the bottom surface 3b side, i.e., the side closer to the cutting lower limit B.

[0021] Alternatively, as another example of variable reciprocating speed cutting, the control means 10 controls the reciprocating speed of the honing head 4 for a hole 3 to be machined having a portion 3c of different material (properties) on the upper side as shown in Figure 3(a) so that the reciprocating speed becomes slower as it approaches the upper cutting limit T within a predetermined cutting range R corresponding to the portion 3c of the hole 3 to be machined.

[0022] Figures 2(b) and 3(b) show graphs (operation diagrams) showing the reciprocating position and rotational speed of the honing head 4 during variable reciprocating speed cutting. Figure 2(b) is a graph when, for example, the workpiece hole 3 of Figure 2(a) is honed, and Figure 3(b) is a graph when, for example, the workpiece hole 3 of Figure 3(a) is honed. In these examples, the rotational speed of the honing head 4 is constant.

[0023] Furthermore, for example, the control means 10 controls the rotation speed of the honing head 4 so that it is faster or slower in the predetermined cutting range R than in other cutting ranges, thereby lengthening or shortening the contact time (variable rotation speed cutting). In particular, in this embodiment, the control means 10 gradually changes the rotation speed of the honing head 4 even in the predetermined cutting range R.

[0024] As an example of variable rotational speed cutting, the control means 10 controls the rotational speed of the honing head 4 for a hole 3 to be machined having a bottom surface 3b as shown in Figure 2(a) so that the rotational speed becomes faster at a position closer to the bottom surface 3b within a predetermined cutting range R on the bottom surface 3b side.

[0025] Alternatively, as another example of variable forward rotation cutting, the control means 10 controls the rotation speed of the honing head 4 so that it becomes faster the closer to the upper side within a predetermined cutting range R corresponding to the portion 3c of the hole 3 to be machined, for a hole 3 to be machined that has a portion 3c of different material (properties) on the upper side as shown in Figure 3(a).

[0026] Figures 2(c) and 3(c) show graphs (operation diagrams) showing the reciprocating position and rotational speed of the honing head 4 during variable rotational speed cutting. Figure 2(c) is a graph when, for example, the workpiece hole 3 of Figure 2(a) is honed, and Figure 3(c) is a graph when, for example, the workpiece hole 3 of Figure 3(a) is honed. In these examples, the reciprocating speed of the honing head 4 is constant.

[0027] When varying the reciprocating speed and rotational speed of the honing head 4 within the predetermined cutting range R, the control means 10 may change them in steps (gradually) or continuously (continuously). When varying the reciprocating speed and rotational speed, the control means 10 varies the reciprocating speed and rotational speed, for example, for each predetermined moving distance.

[0028] The predetermined cutting range R is not limited to either the lower or upper part of the hole 3 to be machined, but may be set in both the lower and upper parts, or a plurality of such ranges may be set at any position between the upper cutting limit T and the lower cutting limit B of the hole 3 to be machined. In this case, the control means 10 may set the reciprocating speed or rotation speed of the honing head 4 for each cutting range R individually.

[0029] Furthermore, either variable reciprocating speed cutting or variable rotational speed cutting may be performed alone, or any combination may be used depending on the type or characteristics of the workpiece 2, such as the shape of the hole 3 to be machined, and the rigidity, material, properties, etc. of the workpiece 2 at the hole 3 to be machined. In other words, the control means 10 may simultaneously control the reciprocating speed and the rotational speed of the honing head 4. In this case, it is preferable to synchronize the control timing of the reciprocating speed and the rotational speed of the honing head 4.

[0030] Preferably, the control means 10 is capable of controlling the honing head 4 so as to perform constant speed cutting, in which the reciprocating speed and rotational speed of the honing head 4 are both constant when the honing head 4 is reciprocated.

[0031] The control means 10 has a control mode in which constant-speed cutting and variable-speed cutting are performed a set number of times during honing of the inner surface 3a of one workpiece hole 3. In this control mode, the control means 10 may perform constant-speed cutting and variable-speed cutting in any order. In this control mode, the control means 10 can control the honing device 1 to perform at least one variable-speed cutting and any number of constant-speed cuttings. The number of times and the order of these cuts, together with the predetermined cutting range R, may be manually input and set by the user via an input screen or input means such as a touch panel, or may be set in advance by a program.

[0032] The control means 10 may be provided with a control mode in which only variable speed cutting is performed, or a control mode in which only constant speed cutting is performed.

[0033] Next, the operation of the embodiment will be described.

[0034] First, the user sets the details of the operation of the honing device 1 by inputting to the control means 10 the cutting range R in the control mode, the variable deceleration rate or variable speed rate for the reciprocating movement and / or rotation of the honing head 4, the number of times constant speed cutting and variable speed cutting are performed (i.e., the balance between the number of times constant speed cutting and variable speed cutting are performed), and the order in which these are performed, for example, depending on the shape of the workpiece 2, the required accuracy of the hole 3 to be machined, etc.

[0035] The control means 10 controls the operation of the honing head 4 in accordance with the details of the set operation. That is, the control means 10 receives a signal corresponding to the position of the honing head 4 detected by the position detection means 7, and outputs a signal to operate the reciprocating motor 6 and / or the rotary motor 8 in accordance with that signal, thereby controlling the honing head 4 to perform the set operation.

[0036] The control means 10 controls the honing head 4 to perform variable speed cutting, changing at least one of the reciprocating speed and rotational speed of the honing head 4 within a predetermined cutting range R of the hole 3 to be machined. As a result, the contact time between the inner surface 3a of the hole 3 to be machined in the workpiece 2 and the grinding wheel 4a of the honing head 4 can be changed between the predetermined cutting range R and other ranges of the hole 3 to improve the machining accuracy of the inner surface 3a of the hole 3 to be machined, particularly depending on the shape, type or characteristics of the workpiece 2 (hole 3 to be machined), such as rigidity, material or properties, and a clean cylindrical shape can be machined.

[0037] In addition, the control means 10 can control the honing head 4 to perform constant-speed cutting by reciprocating the honing head 4 while keeping the reciprocating speed and rotational speed of the honing head 4 constant, and can set the balance between the number of times constant-speed cutting and variable-speed cutting are performed for one hole 3 to be machined.By performing constant-speed cutting and variable-speed cutting the set number of times, it is possible to optimize the balance between machining time and machining accuracy depending on the shape of the workpiece 2 and the required accuracy of the hole 3 to be machined.

[0038] Taking an example of machining a workpiece hole 3 having a bottom surface 3b as shown in Figure 2(a), when only variable speed cutting is performed as shown in Figure 4(a) or Figure 5(a), the contact time between the grinding stone 4a of the honing head 4 and the inner surface 3a of the workpiece hole 3 within a specified cutting range R is longer, and while maintaining machining accuracy, the machining time until the desired cutting state is achieved can be shortened compared to when only constant speed cutting is repeatedly performed.

[0039] Furthermore, as shown in Figure 4(b) or Figure 5(b), when variable speed cutting and constant speed cutting are performed alternately once each, the contact time with the inner surface 3a of the hole 3 to be machined within the specified cutting range R can be appropriately suppressed, and a decrease in machining accuracy caused by uneven wear of the grinding wheel 4a of the honing head 4 due to excessively long contact time can be suppressed.

[0040] Furthermore, as shown in Figure 4(c) or Figure 5(c), when variable speed cutting and constant speed cutting are performed a predetermined number of times, in the example shown, constant speed cutting is performed three times and variable speed cutting is performed once, the contact time with the inner surface 3a of the hole 3 to be machined in the predetermined cutting range R is further reduced, thereby reducing wear on the grinding stone 4a of the honing head 4 and ensuring machining accuracy, which is suitable when, for example, the distance from the bottom surface 3b of the surface 3 to be machined to the predetermined range R is long.

[0041] In this way, for workpieces 2 in which the cutting efficiency, rigidity, etc. differ in parts of the machined hole 3, and therefore precision (cylindricity) cannot be obtained by constant speed cutting alone, by performing variable speed cutting within an appropriate range and number of times, it is possible to obtain good machining precision for the inner surface 3a of the machined hole 3.

[0042] By applying the honing control device 9 to the honing device 1, a function that enables variable speed cutting can be easily provided to a general honing device 1.

[0043] In the above embodiment, when variable speed cutting is performed multiple times, an example has been given in which only variable reciprocating speed cutting with the same control is performed multiple times, or only variable rotational speed cutting with the same control is performed multiple times, but the present invention is not limited to this, and it is also possible to perform a mixture of variable reciprocating speed cutting and variable rotational speed cutting, for example, one variable reciprocating speed cutting and one variable rotational speed cutting, or the reciprocating speed and rotational speed of honing head 4 may be varied simultaneously. Furthermore, in each of the multiple variable speed cuttings, it is not necessary for the control means 10 to control the reciprocating speed and rotational speed of honing head 4 in the same way every time. [Explanation of symbols]

[0044] 1 Honing equipment 2 Work 3 Hole to be machined 3a Inner surface 4 Honing head 4a Grindstone 9 Honing processing control device 10 Control Means R Cutting range

Claims

1. A honing control device that hones the inner surface of a hole to be machined in a workpiece by rotating a honing head having a grinding stone on its outer side and reciprocating the honing head in an axial direction, a control means capable of controlling the honing head to perform variable speed cutting by changing at least one of the reciprocating speed and rotational speed of the honing head within a predetermined cutting range set in accordance with the cutting efficiency of the inner surface of the hole to be machined when the honing head is reciprocated; The control means is capable of controlling the honing head to perform constant speed cutting by making the reciprocating speed and rotational speed of the honing head constant when the honing head is reciprocated, and is capable of setting a balance between the number of times the constant speed cutting and the variable speed cutting are performed for one of the workpiece holes. A honing processing control device characterized by the above.

2. a honing head having a grinding stone on its outer surface and capable of rotation and axial reciprocation; The honing control device according to claim 1; A honing device comprising:

3. A honing method for honing the inner surface of a hole to be machined in a workpiece by rotating a honing head having a grinding stone on its outer side and reciprocating the honing head in its axial direction, Variable speed cutting, in which at least one of the reciprocating speed and rotational speed of the honing head is changed within a predetermined cutting range set according to the cutting efficiency of the inner surface of the hole to be machined when the honing head is reciprocating, and constant speed cutting, in which the honing head is reciprocated while keeping the reciprocating speed and rotational speed of the honing head constant, are performed a set number of times on one hole to be machined. A honing method characterized by the above.

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