JP2007283472A - Honing method and apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a honing method which can stabilize the inside diameter and the surface property of a machined bore, and also can shorten a machining time, and further to provide a honing apparatus. <P>SOLUTION: The honing method for machining the inside peripheral surface of the machining bore comprises a roughing depth setting step S1 of inserting a honing stone into a machining bore of a workpiece and carrying out a rough honing operation by a first depth setting force F<SB>1</SB>and a finishing depth setting step S2 of carrying out a finish honing operation by a second depth setting force F<SB>2</SB>. When a honing amount per a required time calculated based on the data of the inside diameter of the machining bore is larger than a required honing amount, the first depth setting force for honing the next machining bore is decreased, and also the machining diameter D<SB>2</SB>in the roughing depth setting step is decreased. When the above honing amount is smaller than the required honing amount, the first depth setting force for honing the next machining bore is increased, and also the machining diameter in the roughing depth setting step is increased. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a honing method and an apparatus for honing an inner peripheral surface of a plurality of machining holes sequentially.

  For example, a honing grindstone is given a rotational motion and a reciprocating motion in the direction of the rotational axis of the honing grindstone as a finishing hole for a machined hole processed by cutting or grinding, such as a cylinder bore provided in a cylinder block of an automobile engine. In addition, honing is known in which machining accuracy and surface properties are finished with high accuracy.

In a production line for honing the inner peripheral surface of such a processed hole, it is required to secure the processing accuracy and the processed surface properties of the inner peripheral surface of the processed hole and reduce the processing time. For example, Patent Document 1 discloses a honing technique that can shorten the machining cycle time and that can precisely control the honing grindstone.
JP 2003-170344 A

  By the way, when honing the inner peripheral surface of a machining hole such as a cylinder bore, for example, a rough cutting step in which a relatively large cutting force is applied to the honing grindstone to perform rough grinding, and after the rough cutting step, a rough cutting step is performed on the honing grindstone. In general, machining is performed by a finishing cutting step in which a cutting force smaller than the cutting force is applied and finish grinding is performed, and the processing accuracy and surface properties are finished with high accuracy and the processing time is shortened.

  However, in the production line where honing is performed sequentially on the inner peripheral surface of the machining hole, the sharpness of the honing wheel changes due to the effects of the pre-processed surface properties such as cutting and grinding, and the grinding fluid used during honing. However, it may cause problems such as deterioration of the processing accuracy and processing surface properties of the processing holes or increase of processing time.

  In contrast, a skilled worker can determine the sharpness of the honing wheel and adjust the cutting force of the honing wheel and the switching time from the rough cutting step to the finishing cutting step. The adjustments made by the workers not only require a large amount of man-hours but also require a certain amount of experience and knowledge for the workers, so it is not only costly, but also machining accuracy such as machining accuracy and machining surface properties The reality is that it is difficult to ensure quality stably.

  Accordingly, the present invention has been made in view of the above technical problem, and stabilizes the inner diameter and the surface properties of the machining holes and the machining time when the inner peripheral surfaces of the plurality of machining holes are successively honed. An object of the present invention is to provide a honing method and apparatus capable of shortening the length.

  For this reason, the honing method according to claim 1 of the present application includes a honing grindstone expanding means for inserting a honing grindstone mounted on a honing head into a machining hole of a workpiece and expanding the honing grindstone in a radial direction of the honing head. A rough cutting step in which a first cutting force is applied to the honing grindstone against the inner peripheral surface of the processing hole and rough grinding is performed, and after the rough cutting step, the honing grindstone expanding means is smaller than the first cutting force. A honing method for processing the inner peripheral surface of the processing hole by a finishing cutting step of applying a second cutting force and pressing the honing grindstone against the inner peripheral surface of the processing hole for finish grinding, The processing hole measured by an inner diameter measuring means for measuring the inner diameter of the processing hole when the holes are sequentially honed. Based on the inner diameter data, a grinding amount per predetermined time of the honing grindstone in the rough cutting step and / or the finishing cutting step is calculated, and the first in the next honing processing of the processing hole is calculated according to the grinding amount. The cutting force and the switching time from the rough cutting step to the finishing cutting step are corrected.

  The invention method according to claim 2 of the present application is the invention method according to claim 1, wherein a grinding amount per predetermined time of the honing grindstone in the rough cutting step and / or the finishing cutting step is larger than a predetermined grinding amount. In this case, the first cutting force and the switching time are corrected so as to reduce the first cutting force according to the grinding amount and to advance the switching time, and the rough cutting step and / or When the grinding amount per predetermined time of the honing grindstone in the finishing cutting step is smaller than a predetermined grinding amount, the first cutting force is increased according to the grinding amount and the switching time is delayed. The first cutting force and the switching time are corrected.

  Furthermore, the invention method according to claim 3 of the present application is the invention method according to claim 1 or 2, wherein the workpiece is a cylinder block of an engine, and the machining hole is a cylinder bore provided in the cylinder block. It is characterized by that.

  Still further, the honing apparatus according to claim 4 of the present application includes a honing grindstone mounted on a honing head, and a honing grindstone expanding means mounted on the honing head and expanding the honing grindstone in a radial direction of the honing head; Cutting control means for applying a predetermined cutting force to the honing grindstone expanding means and controlling the cutting of the honing grindstone into the machining hole of the workpiece, wherein the cutting control means applies a first cutting force to the honing grindstone expanding means. And a rough cutting step in which the honing grindstone is pressed against the inner peripheral surface of the machining hole and rough grinding is performed, and after the rough cutting step, the cutting control means applies a smaller first cutting force to the honing grindstone expanding means. The cutting force of 2 is applied and the honing grindstone is pressed against the inner peripheral surface of the machining hole. A honing apparatus for processing an inner peripheral surface of the processing hole by a finishing cutting step for grinding, comprising an inner diameter measuring means for measuring an inner diameter of the processing hole, wherein the cutting control means is measured by the inner diameter measuring means. A grinding amount calculation unit that calculates a grinding amount per predetermined time of the honing grindstone based on the inner diameter data of the processed hole, and a grinding amount per predetermined time of the honing grindstone calculated by the grinding amount calculation unit Accordingly, a correction control unit that corrects the first cutting force and the switching timing from the rough cutting step to the finishing cutting step is provided.

  Still further, in the invention according to claim 5 of the present application, in the invention according to claim 4, the correction control unit is configured such that the grinding amount when the grinding amount per predetermined time of the honing grindstone is larger than a predetermined grinding amount. Accordingly, the first cutting force and the switching time are corrected so that the first cutting force is decreased and the switching time is advanced in accordance with the first cutting force, and the grinding amount per predetermined time of the honing wheel is a predetermined grinding amount. If smaller, the first cutting force and the switching time are corrected so as to increase the first cutting force and delay the switching time according to the grinding amount. It is.

  According to the honing method according to claim 1 of the present application, when a plurality of machining holes are sequentially honed, the honing grindstone in the rough cutting step and / or the finishing cutting step per predetermined time based on the inner diameter data of the machining holes. The cutting amount of the honing grindstone is calculated by correcting the first cutting force and the timing of switching from the rough cutting step to the finishing cutting step in the honing of the next machining hole in accordance with the grinding amount. The cutting force of the rough cutting step and the switching time from the rough cutting step to the finishing cutting step can be adjusted according to the conditions, so that the inner diameter and surface properties of the machining hole can be stabilized and the machining time can be shortened. it can.

Further, according to the invention method of claim 2 of the present application, when the grinding amount per predetermined time of the honing grindstone is larger than the predetermined grinding amount, the first cutting force is reduced and the switching time is advanced, When the grinding amount per predetermined time of the grindstone is smaller than the predetermined grinding amount, the first cutting force is increased and the switching time is corrected to be delayed, so the machining pattern is changed according to the sharpness of the honing grindstone. It is possible to adjust, and the above effect can be more effectively exhibited.
That is, when the grinding amount of the honing grindstone per predetermined time is larger than the predetermined grinding amount (the sharpness is large), the first cutting force is reduced to obtain an appropriate grinding amount, and the rough cutting step to the finishing cutting step is performed. By making the switching time earlier, the finishing cut step for reducing the surface roughness of the machined surface can be lengthened, and the machining diameter accuracy and the machined surface properties can be stabilized. On the other hand, when the grinding amount per predetermined time of the honing grindstone is smaller than the predetermined grinding amount (the sharpness is small), the grinding amount is increased by increasing the first cutting force, and from the rough cutting step to the finishing cutting step. By slowing down the switching time, the rough cutting step is lengthened to shorten the machining time, and when the honing grindstone is sharp, the surface roughness of the machined surface is small, so even if the finishing cut step is short It is possible to keep the diameter accuracy and the surface finish stable.

  Furthermore, according to the invention method of claim 3 of the present application, even when honing the cylinder bore provided in the cylinder block of the engine, the inner diameter of the inner peripheral surface of the cylinder bore and the processed surface properties are stabilized and the processing time is reduced. It can be shortened, and the above effect can be more effectively achieved.

  Furthermore, according to the honing apparatus according to claim 4 of the present application, the cutting control means for controlling the cutting of the honing grindstone includes a grinding amount calculation unit for calculating a grinding amount per predetermined time of the honing grindstone, By providing a correction control unit that corrects the first cutting force and the timing of switching from the rough cutting step to the finishing cutting step according to the grinding amount per predetermined time, the roughing according to the sharpness of the honing grindstone is provided. By adjusting the cutting force of the cutting step and the switching time from the rough cutting step to the finishing cutting step, the inner diameter of the machining hole and the machining surface properties can be stabilized and the machining time can be shortened.

Still further, according to the invention of claim 5 of the present application, when the grinding amount per predetermined time of the honing grindstone is larger than the predetermined grinding amount, the correction control unit reduces the first cutting force and the switching time. If the grinding amount per predetermined time of the honing wheel is smaller than the predetermined grinding amount, the first cutting force is increased and the switching time is corrected so that the switching time is delayed. Thus, the processing pattern can be adjusted, and the above effect can be more effectively achieved.
That is, when the grinding amount of the honing grindstone per predetermined time is larger than the predetermined grinding amount (the sharpness is large), the first cutting force is reduced to obtain an appropriate grinding amount, and the rough cutting step to the finishing cutting step is performed. By making the switching time earlier, the finishing cut step for reducing the surface roughness of the machined surface can be lengthened, and the machining diameter accuracy and the machined surface properties can be stabilized. On the other hand, when the grinding amount per predetermined time of the honing grindstone is smaller than the predetermined grinding amount (the sharpness is small), the grinding amount is increased by increasing the first cutting force, and from the rough cutting step to the finishing cutting step. By slowing down the switching time, the rough cutting step is lengthened to shorten the machining time, and when the honing grindstone is sharp, the surface roughness of the machined surface is small, so even if the finishing cut step is short It is possible to keep the diameter accuracy and the surface finish stable.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is an explanatory view schematically showing a main part of a honing apparatus according to an embodiment of the present invention. FIG. 2 is a cross-sectional explanatory view taken along line Y2-Y2 in FIG. As shown in FIG. 1, the honing apparatus 1 according to this embodiment includes a tool main body 2 that extends in the vertical direction and is formed in a substantially cylindrical shape, and a honing head 3 that is connected to the lower end of the tool main body 2. ing.

  In the honing apparatus 1, a push rod 4 extending in the vertical direction coaxially with the tool body 2 is disposed inside the tool body 2, and the push rod 4 has a lower end portion extending in the direction of the extension line of the push rod 4. An extending taper cone 5 is connected. The taper cone 5 extends the honing grindstone 7 mounted on the honing head 3 outwardly in the radial direction of the honing head 3 as indicated by an arrow A1 through an expansion plate 6 disposed in the honing head 3. The honing grindstone expanding means for expanding the honing grindstone 7 radially outward of the honing head 3 is constituted by the push rod 4, the tapered cone 5 and the expansion plate 6.

  The push rod 4 is configured to be movable up and down as indicated by an arrow A2 by a driving means (not shown). When the push rod 4 is moved downward, the taper cone 5 is moved downward and expanded. The honing grindstone 7 is expanded radially outward of the honing head 3 through the plate 6. The honing grindstone 7 is configured to move radially inward of the honing head 3 when the tapered cone 5 is moved upward.

  As shown in FIG. 2, the honing grindstone 7 is mounted on the peripheral portion of the honing head 3 at equal intervals of 90 degrees, and four honing grindstones 7 are disposed on the honing head 3. Corresponding to each honing grindstone 7, four expansion plates 6 are arranged on the honing head 3 at equal intervals of 90 degrees. In addition, the honing grindstone 7 is not limited to four, and may be six or eight.

  The honing apparatus 1 includes a rotation driving means (not shown) for rotating the tool body 2 and the honing head 3 as indicated by an arrow A3, and the rotation axis directions of the tool body 2 and the honing head 3, that is, an arrow A4. Thus, a reciprocating drive means (not shown) for reciprocating in the vertical direction is provided, and the rotation driving means and the reciprocating drive means are connected to the tool body 2.

  Further, the honing apparatus 1 is connected to the push rod 4 for measuring the cutting force applied to the push rod 4, and can measure the cutting force during the honing process. Further, an air gauge 16 for measuring the inner diameter of the processing hole 11 during the honing process is disposed on the honing head 3, and the air gauges 16 are mounted on the peripheral edge of the honing head 3 at equal intervals of 90 degrees. The air gauges 16 are not limited to four, and two air gauges 16 may be mounted at equal intervals.

  In the present embodiment, the pressure sensor 15 is connected to the push rod 4, but other cutting force measuring means for measuring the cutting force applied to the push rod can also be used. Further, in place of the air gauge 16, other inner diameter measuring means for measuring the inner diameter of the processed hole 11 can be used.

  The honing apparatus 1 is also provided with a control unit (not shown) for controlling the rotational movement and the reciprocating movement of the honing head 3 and the honing grindstone 7 based on the set machining conditions. Applies a predetermined cutting force to the honing wheel expanding means to control the cutting of the honing wheel 7 into the machining hole 11 of the workpiece 10.

  The control unit also includes a grinding amount calculation unit for calculating a grinding amount per predetermined time of the honing grindstone based on inner diameter data of the machining hole measured by the inner diameter measuring means, and a honing grindstone calculated by the grinding amount calculation unit And a correction control unit that corrects the cutting force applied to the honing grindstone expanding means according to the grinding amount per predetermined time. The control unit is configured with, for example, a microcomputer as a main part.

  As shown in FIG. 1, when honing the inner peripheral surface 12 of the machining hole 11 of the workpiece 10 such as a cylinder bore provided in a cylinder block of an engine, for example, a honing grindstone 7 attached to the honing head 3 is first used. It is inserted into the processing hole 11. Next, a predetermined cutting force is applied to the push rod 4 by the driving means, and the honing grindstone 7 is expanded radially outward of the honing head 3 in the machining hole 11, so that the honing grindstone 7 is formed in the machining hole 11. It is pressed against the inner peripheral surface 12.

  In this state, the honing grindstone 7 is given a rotational motion by the rotational driving means and a reciprocating motion by the reciprocating driving means, and the inner peripheral surface 12 of the machining hole 11 is honed. In the honing process, the grinding oil is supplied by a grinding oil supply means (not shown).

Next, a processing pattern when honing the inner peripheral surface 12 of the processing hole 11 using the honing processing device 1 will be described.
FIG. 3 is an explanatory diagram showing a processing pattern when processing is performed using the honing apparatus. In FIG. 3, the horizontal axis represents the machining diameter, which is the inner diameter of the machining hole, and the vertical axis represents the cutting force applied to the honing grindstone expanding means, specifically the push rod, for expanding the honing grindstone.

When honing the inner peripheral surface 12 of the machining hole 11, as described above, the honing grindstone 7 attached to the honing head 3 is first inserted into the machining hole 11. When the honing grindstone 7 is inserted to a predetermined machining position, a cutting force is applied to the honing grindstone expanding means, specifically, the push rod 4 by the incision control means, and the honing grindstone 7 is applied to the inner peripheral surface 12 of the machining hole 11. Expanded toward. As shown in FIG. 3, the cutting force is increased to the first cutting force F _1, and the inner peripheral surface 12 of the processing hole 11 increases from the processing diameter D ₀ during the pre-processing to the processing diameter with the increase of the cutting force. D _{1 is} processed.

Next, rough cut step S1 of the inner peripheral surface 12 to rough grinding of the machining hole 11 pressed against the honing grinder 7 with the inner peripheral surface 12 of the machining hole 11 while applying a first cut force F ₁ to the push rod 4 Done. Rough cut step S1 is performed until a predetermined processing diameter D ₂ that is set in advance. In FIG. 3, the cutting force F ₁ varies depending on the surface condition of the processed surface.

Once processed in rough cut step S1 to a predetermined working diameter D _2, once reduces the cut force applied to the push rod 4. In the present embodiment reduces the cutting force from the first cut force F ₁ to the third cut force F _3. The inner peripheral surface 12 of the machining hole 11 is machined from the machining diameter D ₂ to the machining diameter D ₃ with decreasing the cut force.

After reducing the cut force applied to the push rod 4 at a time is brought again increased cut force, the cut force is increased from the third cut force F ₃ to the second cut force F _2. The inner peripheral surface of the machining hole 11 12 is machined from the machining diameter D ₃ with increasing the cut force to the machining diameter D _4. The second cut force F ₂ is set to be smaller than the first cut force F ₁ in the rough cut step S1.

Then, finishing cuts step S2 for finish grinding the inner peripheral surface 12 of the machining hole 11 pressed against the honing grindstone 7 while applying a second cut force F ₂ to the push rod 4 to the inner peripheral surface 12 of the machining hole 11 Done. Finishing cut step S2 is performed to reach a predetermined processing diameter D _5, which is set in advance.

When in the finishing cut step S2 is processed to a predetermined working diameter D _5, reduces the cut force applied to the push rod 4, reduces the honing grinder 7 radially inward of the honing head 7. The inner peripheral surface 12 of the machining hole 11 is machined from the machining diameter D ₅ to the machining diameter D ₆ with decreasing the cut force. Then, the honing grindstone 7 is moved from the inside of the processing hole 11 to the outside, and the honing processing is completed.

  In this way, when the inner peripheral surfaces of the plurality of holes are sequentially honed by the rough cutting step S1 and the finishing cutting step S2, the processing surface properties of the pre-processing such as cutting processing and grinding processing, the grinding fluid used at the processing, etc. The sharpness of the honing wheel changes under the influence, which may cause problems such as deterioration of the processing accuracy of the processing hole and surface property or increase of processing time, but in this embodiment, the processing pattern according to the sharpness of the honing wheel This problem can be avoided by controlling.

4 and 5 are control flowcharts showing operation patterns of the honing apparatus.
In the honing device 1, when honing a plurality of processing holes sequentially, first, the first cutting force (hereinafter referred to as rough cutting force) F ₁ and the processing diameter (hereinafter referred to as rough processing diameter) in the rough cutting step S 1. ) Various machining conditions such as D ₂ , second cutting force (hereinafter referred to as finishing cutting force) F ₂ and machining diameter (hereinafter referred to as finishing machining diameter) D ₅ in finishing cutting step S 2 are set, and honing is started. (# 1).

The honing grindstone 7 is inserted into the machining hole 11, and a cutting force is given to the honing grindstone expanding means, specifically, the push rod 4 by the incision control means based on the set machining conditions. Is expanded toward the inner peripheral surface 12 (# 2). Next, it cuts force applied to the honing grindstone extension means, whether or not reached rough cut force F ₁ which is set is determined (# 3).

# If the cut force applied to the honing grindstone expanding means in 3 reaches the rough cut force F _1, rough cut force F ₁ is rough grinding is performed by rough cuts step S1 in a state of being applied to the honing grindstone extension means ( # 4). The rough grinding by rough cuts step S1, an inner circumferential surface 12 of the machining hole 11 is performed until a roughing diameter D ₂ that is set (# 5).

# When processing diameter is the inner diameter of the machining hole 11 in 5 reaches the roughing diameter D _2, ahead motion of the honing grindstone 7 to switch from rough cut steps S1 to finish cut step S2 is performed (# 6). As described above, the cut force applied to the honing grindstone expanding means is reduced from the first cut force F ₁ to the third cut force F _3.

In # 7, the cutting force applied to the honing wheel expanding means is increased again, and the honing wheel 7 is expanded radially outward of the honing head. And, it cuts force applied to the honing grindstone extension means, whether or not reached the finishing cut force F ₂ that has been set is determined (# 8).

When cut force applied to the honing grindstone expanding means in # 8 reaches the cut force F ₂ finish, finish grinding is performed by the final cut step S2 in a state where the finish cut force F ₂ is applied to the honing grindstone extension means ( # 9). Finish grinding by the finishing cut step S2, the inner circumferential surface 12 of the machining hole 11 is performed until reaching the finishing diameter D _5, which is set (# 10).

Upon reaching the working diameter D ₅ machining diameter finishing an inner diameter of the machining hole 11 in # 10, the cut force applied to the honing grindstone expanding means is reduced, the reduced honing grinder 7 is radially inward of the honing head 3 (# 11). The inner circumferential surface 12 of the machining hole 11 in accordance with the reduction of the honing grinder 7 is machined to a predetermined processing diameter D _6. When the cutting force applied to the honing grindstone expanding means is removed, the honing grindstone 7 is moved from the inside of the machining hole to the outside to complete the honing process for one machining hole (# 12).

  When honing of one hole is completed, a grinding amount per predetermined time (hereinafter referred to as a unit grinding amount) is calculated by the grinding amount calculation unit based on the inner diameter data measured by the inner diameter measuring means (# 13). ).

Next, in # 14, it is determined whether the unit grinding amount of the honing grindstone 7 is a predetermined grinding amount, and it is determined whether the sharpness of the honing grindstone 7 is appropriate. In the present embodiment, calculates the grinding amount per predetermined time when honing grinding amount per predetermined time of the honing grindstone 7 in rough cut step S1, in particular from the working diameter D ₁ to the machining diameter D _2, It is determined whether or not the grinding amount is within a predetermined range.

  When the determination result in # 14 is YES, that is, when the unit grinding amount of the honing grindstone 7 is a predetermined grinding amount, it is determined that the sharpness of the honing grindstone 7 is appropriate, and in the honing of the next machining hole Is processed under the same processing conditions as the honing of the previous processing hole. In the production line in which the plurality of processed holes 11 are sequentially honed, it is determined in # 20 whether or not the honing of all the processed holes has been completed. If the determination result at # 20 is YES, the honing process is terminated. On the other hand, when the determination result at # 20 is NO, the next machining hole is honed according to # 1 to # 12.

On the other hand, if the determination result in # 14 is NO, that is, if the unit grinding amount of the honing wheel 7 is not the predetermined grinding amount, it is determined whether or not the unit grinding amount of the honing wheel 7 is larger than the predetermined grinding amount. (# 15). When the determination result in # 15 is YES, that is, when the unit grinding amount of the honing grindstone 7 is larger than the predetermined grinding amount, it is determined that the sharpness of the honing grindstone 7 is too good, and in the honing process of the next machining hole, thereby reducing the rough machining diameter D ₂ which is previously set in # 16 is corrected by the correction control unit so as to lower the rough cut force F ₁ which is previously set in # 17.

Then, in # 20, it is determined whether or not the honing processing for all the processing holes is completed. If the determination result in # 20 is NO, the next processing hole 11 is honed according to # 1 to # 12. , the rough cut force F ₁ which is corrected in # 17, is used as a rough cut force in # 3, the rough machining diameter D ₂ which is corrected in # 16, is used as a roughing diameter at # 5. Thus, when the sharpness of the honing grindstone 7 is too good, it correct | amends so that the cutting force in rough cutting step S1 may be made low, and correct | amends so that the switching time from rough cutting step S1 to finishing cutting step S2 may be advanced. Then, the next machining hole 11 is honed.

On the other hand, when the determination result in # 15 is NO, that is, when the unit grinding amount of the honing grindstone 7 is smaller than the predetermined grinding amount, it is determined that the sharpness of the honing grindstone 7 is not good, and the honing of the next machining hole is performed. upon, thereby increasing the roughing diameter D ₂ which is previously set in # 18 is corrected by the correction control unit so as to increase the rough cut force F ₁ which is previously set in # 19.

Then, in # 20, it is determined whether or not the honing processing for all the processing holes is completed. If the determination result in # 20 is NO, the next processing hole 11 is honed according to # 1 to # 12. Ara cut force F ₁ which is corrected in # 19 is used as a rough cut force in # 3, the rough machining diameter D ₂ which is corrected in # 18 is used as a roughing diameter at # 5. Thus, when the sharpness of the honing grindstone 7 is not good, it correct | amends so that the cutting force in rough cutting step S1 may be made high, and correct | amends so that the switching time from rough cutting step S1 to finishing cutting step S2 may be delayed. Then, the next machining hole 11 is honed.

  As described above, in the present embodiment, when the plurality of machining holes are sequentially honed, the unit of the honing grindstone in the rough cutting step based on the inner diameter data of the machining hole measured by the inner diameter measuring unit that measures the inner diameter of the machining hole. The grinding amount is calculated by the grinding amount calculation unit, and according to the unit grinding amount, the rough cutting force and the switching time from the rough cutting step to the finishing cutting step in the honing of the next machining hole, specifically rough machining When the unit grinding amount is larger than the predetermined grinding amount, the rough cutting force is reduced and the switching time is corrected earlier so that the unit grinding amount is the predetermined grinding amount. When the amount is smaller than the amount, the rough cutting force is increased and the switching time is corrected to be delayed.

  The roughing diameter and the rough cutting force that are corrected when the unit grinding amount of the honing grindstone 7 is not a predetermined grinding amount are corrected by a fixed value with respect to the preset roughing diameter and rough cutting force, respectively. It may be set or may be corrected according to the unit grinding amount.

In the present embodiment, in accordance with the grinding amount per predetermined time of the honing grindstone 7 in rough cut step S1, the cut force F ₁ and the switching time period from rough cut steps S1 to finish cut step S2 in rough cut step S1, specifically Although corrected and roughing diameter D ₂ to a predetermined time of honing grinding amount per predetermined time of the honing grindstone in the finish cut step S2, in particular from the working diameter D ₄ to the machining diameter D ₅ depending on the grinding amount per unit time, per predetermined time of the honing grindstone 7 in the cut force F ₁ and the roughing diameter D ₂ and may be corrected or rough cuts step S1 and the finishing cut step S2, depending on the grinding amount may be corrected and the cut force F ₁ and the roughing diameter D _2.

As described above, according to the honing method according to the present embodiment, when the plurality of processing holes 10 are sequentially honed, in the rough cutting step S1 and / or the finishing cutting step S2 based on the inner diameter data of the processing holes 10. calculates the grinding amount per predetermined time of the honing grindstone 7, in accordance with the grinding amount, switching period from rough cut force F ₁ and the rough cut step S1 in the honing of the next machining holes 10 to finish the cut step S2, Specifically by correcting the roughing diameter D _2, according to the cutting quality of honing grindstone, to adjust the switching stage to the finishing cut step from incision force and rough cut step of rough cut step, the machining hole The inner diameter and the surface finish can be stabilized and the processing time can be shortened.

Further, when the grinding amount per predetermined time of the honing grindstone 7 is larger than the predetermined amount of grinding, as well reduce the rough cut force F ₁ to faster the switching time period, in particular to reduce the roughing diameter D _{2 ,} so that the grinding amount per predetermined time of the honing grindstone 7 is smaller than the predetermined amount of grinding slows the switching stage with increasing rough cut force F _1, and specifically to increase the roughing diameter D ₂ Therefore, the processing pattern can be adjusted according to the sharpness of the honing grindstone, and the above effect can be more effectively achieved.
That is, the grinding amount per predetermined time of the honing grindstone 7 (large sharpness) a predetermined amount of grinding larger time, to reduce the rough cut force F ₁ and a suitable grinding amount, to finish cut step roughing cuts step By making the changeover time earlier, the finishing cut step for reducing the surface roughness of the machined surface can be lengthened, and the machining diameter accuracy and the machined surface properties can be stabilized. On the other hand, the grinding amount per predetermined time of the honing grindstone 7 (smaller sharpness) a predetermined amount of grinding less time, to increase the grinding amount by increasing the rough cut force F _1, to finish cut step roughing cuts step The rough cutting step is lengthened to reduce the machining time by slowing the switching time of the honing wheel, and when the honing grindstone 7 has a small sharpness, the surface roughness of the machining surface is small, so the finishing cutting step is short. In addition, it is possible to maintain the machining diameter accuracy and the stabilization of the machined surface properties.

  Furthermore, when honing a cylinder bore provided in the cylinder block of the engine, the inner diameter of the inner peripheral surface of the cylinder bore and the machining surface properties can be stabilized and the machining time can be shortened, making the above effects more effective. Can play.

Furthermore, according to the honing apparatus 1 according to the present embodiment, the cutting control means for controlling the cutting of the honing grindstone 7 includes a grinding amount calculation unit that calculates the grinding amount per predetermined time of the honing grindstone 7, and the honing grindstone. rough cut force F ₁ and the rough cut switching period from the step S1 to the finishing cut step S2, the honing grindstone expanding means as in particular to correct the roughing diameter D ₂ according to the grinding amount per predetermined time of 7 More specifically, by providing a correction control unit that controls the cutting force applied to the push rod 4, the cutting force of the rough cutting step and the rough cutting step to the finishing cutting step according to the sharpness of the honing grindstone. The switching time can be adjusted to stabilize the inner diameter and the processed surface properties of the processing hole and reduce the processing time.

Furthermore, the correction control unit, when the grinding amount per predetermined time of the honing grindstone 7 is larger than the predetermined amount of grinding, as well reduce the rough cut force F ₁ to faster the switching time period, in particular rough machining a smaller diameter D _2, when the grinding amount per predetermined time of the honing grindstone 7 is smaller than the predetermined amount of grinding slows the switching stage with increasing rough cut force F _1, in particular rough machining diameter is corrected so as to increase the D _2, according to the cutting quality of honing grindstone, it is possible to adjust the processing pattern, it is possible to obtain more effective the effect.
That is, the grinding amount per predetermined time of the honing grindstone 7 (large sharpness) a predetermined amount of grinding larger time, to reduce the rough cut force F ₁ and a suitable grinding amount, to finish cut step roughing cuts step By making the changeover time earlier, the finishing cut step for reducing the surface roughness of the machined surface can be lengthened, and the machining diameter accuracy and the machined surface properties can be stabilized. On the other hand, the grinding amount per predetermined time of the honing grindstone 7 (smaller sharpness) a predetermined amount of grinding less time, to increase the grinding amount by increasing the rough cut force F _1, to finish cut step roughing cuts step The rough cutting step is lengthened to reduce the machining time by slowing the switching time of the honing wheel, and when the honing grindstone 7 has a small sharpness, the surface roughness of the machining surface is small, so the finishing cutting step is short. In addition, it is possible to maintain the machining diameter accuracy and the stabilization of the machined surface properties.

  In addition, when honing a cylinder bore provided in the cylinder block as the machining hole 10, the honing process according to the present embodiment can be applied even when the cylinder liner is inserted into the cylinder bore. When honing the peripheral surface, the same effects as in the above embodiment can be obtained.

In this embodiment, the sharpness of the honing grindstone is determined by the grinding amount per predetermined time of the honing grindstone, but the sharpness of the honing grindstone 7 is determined using other criteria such as the surface roughness of the processed surface. Even in such a case, according to the sharpness of the honing grindstone, by correcting the cutting force in the rough cutting step and the switching time from the rough cutting step to the finishing cutting step, the same effect as in the above embodiment Can be played.
In the present embodiment, the rough cutting force F ₁ is adjusted by determining the grinding amount per predetermined time of the honing grindstone, but both the rough cutting force F ₁ and the finishing cutting force F ₂ are similarly adjusted. You may make it do.

  As described above, the present invention is not limited to the illustrated embodiments, and it goes without saying that various improvements and design changes can be made without departing from the gist of the present invention.

  The present invention relates to a honing method and apparatus capable of stabilizing the inner diameter and processing surface properties of a processing hole and reducing the processing time. For example, a honing process is performed on an inner surface of a cylinder such as a cylinder bore provided in a cylinder block of an engine. In this case, it can be suitably applied.

It is explanatory drawing which shows typically the principal part of the honing processing apparatus which concerns on embodiment of this invention. FIG. 2 is a cross-sectional explanatory view taken along line Y2-Y2 in FIG. It is explanatory drawing which shows the process pattern at the time of processing using the said honing processing apparatus. It is a control flowchart which shows the operation | movement pattern of the said honing processing apparatus. It is a control flowchart which shows the operation | movement pattern of the said honing processing apparatus.

Explanation of symbols

1 honing device 3 honing head 4 push rod 5 tapered cone 6 extension plate 7 honing grindstone 10 workpiece 11 machined hole 12 inner circumferential surface 15 a pressure sensor 16 air gauge S1 rough cut step S2 finishing cuts Step F ₁ to F ₃ cut force D ₀ ~ D ₆ processing diameter

Claims (5)

A honing grindstone mounted on the honing head is inserted into a machining hole of the workpiece, and a honing grindstone extending means for expanding the honing grindstone in the radial direction of the honing head is applied to the honing grindstone to process the honing grindstone. A rough cutting step of pressing the inner peripheral surface of the hole for rough grinding, and a second cutting force smaller than the first cutting force is applied to the honing grindstone expanding means after the rough cutting step, and the honing grindstone is applied to the machining hole. A honing method for processing the inner peripheral surface of the processing hole by a finish cutting step of pressing and grinding the inner peripheral surface of the processing hole,
In the case of sequentially honing the plurality of processing holes, the rough cutting step and / or the finishing cutting step based on the inner diameter data of the processing hole measured by an inner diameter measuring unit that measures the inner diameter of the processing hole. A grinding amount per predetermined time of the honing grindstone is calculated, and according to the grinding amount, the first cutting force and the switching time from the rough cutting step to the finishing cutting step in the next honing processing of the processing hole, Correct,
The honing method characterized by this. When the grinding amount per predetermined time of the honing grindstone in the rough cutting step and / or the finishing cutting step is larger than a predetermined grinding amount, the first cutting force is reduced according to the grinding amount and the switching is performed. Correcting the first cutting force and the switching time so as to advance the time;
When the grinding amount per predetermined time of the honing grindstone in the rough cutting step and / or the finishing cutting step is smaller than a predetermined grinding amount, the first cutting force is increased according to the grinding amount and the switching is performed. Correcting the first cutting force and the switching time so as to delay the time;
The honing method according to claim 1, wherein: The workpiece is an engine cylinder block;
The processing hole is a cylinder bore provided in the cylinder block.
The honing method according to claim 1 or 2, characterized in that: A honing wheel mounted on the honing head, honing wheel expanding means mounted on the honing head for expanding the honing wheel in the radial direction of the honing head, and a predetermined cutting force is applied to the honing wheel expanding means to A cutting control means for controlling the cutting of the honing grindstone into the machining hole, the cutting control means applies a first cutting force to the honing grind expanding means, and the honing grindstone is applied to the inner peripheral surface of the machining hole. A rough cutting step of pressing rough grinding, and after the rough cutting step, the cutting control means applies a second cutting force smaller than the first cutting force to the honing grindstone expanding means, and the honing grindstone is applied to the machining hole. A finishing incision step in which the inner peripheral surface is pressed and ground to finish. A honing processing apparatus for processing a surface,
An inner diameter measuring means for measuring the inner diameter of the processing hole;
The cutting control means is calculated by a grinding amount calculation unit that calculates a grinding amount per predetermined time of the honing grindstone based on the inner diameter data of the machining hole measured by the inner diameter measurement unit, and the grinding amount calculation unit. And a correction control unit that corrects the first cutting force and the switching time from the rough cutting step to the finishing cutting step according to the grinding amount per predetermined time of the honing grindstone.
Honing machine characterized by that. When the grinding amount per predetermined time of the honing grindstone is larger than the predetermined grinding amount, the correction control unit decreases the first cutting force according to the grinding amount and accelerates the switching time. The first cutting force and the switching time are corrected, and when the grinding amount per predetermined time of the honing grindstone is smaller than the predetermined grinding amount, the first cutting force is increased according to the grinding amount. The honing apparatus according to claim 4, wherein the first cutting force and the switching time are corrected so as to delay the switching time.

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