KR0137093B1 - A method and a device for honing vork - Google Patents

Abstract

The surface pressure of the grindstone installed in the honing tool on the inner surface of the processing hole is maintained as desired, thereby maintaining a constant processing time for one workpiece and at the same time uniformizing the state of the finished surface. Before honing is performed, the expansion pressure p by the hydraulic source 29 is measured by the hydraulic gauge 35, and the pressing pressure of the grindstone 19 generated by the expansion pressure p is measured by a pressure measuring ring. Measure using (51). The expansion pressure P is controlled by opening and closing the valve 33 so that the pressing pressure becomes a set value while maintaining a predetermined relationship in which the respective measured values are related to each other in advance.

Description

Honing processing method and honing processing device

1 is a main configuration diagram of a honing processing apparatus showing an embodiment of the present invention.

2 is a perspective view showing an example of the pressure measuring ring in the honing processing apparatus of FIG.

3 is a perspective view showing another example of the pressure measuring ring in the honing processing apparatus of FIG.

4 is an explanatory diagram showing a permissible range of the relationship between the expansion pressure and the pressing pressure (gear surface pressure).

5 is a pull chart showing the operation of the honing machine of FIG.

6 is an explanatory diagram comparing the relation between the pressing pressure (gear surface pressure) and the roughness of the machined surface according to the conventional example and the present embodiment.

7 is a main configuration diagram of a honing processing device showing a conventional example.

(Explanation of the sign)

15 honing tool 19 grindstone 21a inner working hole

29: hydraulic pressure source (extension pressure generating means) 37: expansion pressure control circuit (control means)

51: pressure measuring ring (pressing pressure detecting means) p: expansion pressure

q: pressing pressure

This invention is honing processing in which grinding grinds the hole hole name by honing tool attached to the grindstone while rotating and axial movement of grinding grindstone is pressed by expansion movement with predetermined expansion pressure with respect to the processing hole inner surface of workpiece. It relates to a method and a honing machine.

For precision finishing on the inner surface of the machining bore of the workpiece, for example, on the inner surface of the cylinder bore of the engine, honing is generally used in which the honing tool with the grindstone is rotated in the axial direction, ie, shangdong. (See Japanese Patent Application Laid-Open No. 56-76374)

FIG. 7 is a schematic operation explanatory diagram showing a state in which honing is performed on the inner surface 3a of the processing hole of the workpiece 3 using the honing tool 1. A plurality of grindstones 7 are arranged on the outer circumference of the honing body 5, and the grindstones 7 are installed in the honing body 5 and are movable in a direction opposite to the processing hole inner surface 3a. (9) is mounted on the outer circumference. The honing body 5 is provided with a movable rod 13 which is movable with a taper-cone 11 for expanding the grinding wheel, and the expansion rod 13 is provided with an expansion pressure by a hydraulic mechanism not shown. (p) is given.

When the expansion pressure p is applied to the extension rod 13, the tapered cone 11 moves downward, and with this, the shoe 9 moves outward with the grindstone 7 to form the machining hole inner surface 3a. The pressing pressure of the grindstone 7 is generated. As the honing tool 1 rotates and moves in this state, the machining hole inner surface 3a is honed.

In this honing process, it is important for quality control that it is necessary for production control that the processing time for one work piece should be constant and the condition of roughened surface should be uniform. The influence on the processing time and the state of the finished surface is the pressing pressure on the inner surface of the processing hole by the grinding wheel, that is, the surface pressure of the grinding wheel.

However, since the surface pressure on the inner surface of the processing hole is changed by the state of the honing tool or the degree of glare of the grinding wheel itself in the process of using one grindstone, the processing time is not constant or the state of the finished surface after finishing There is a problem of being uneven.

Here, an object of the present invention is to maintain the surface pressure of the grinding wheel on the inner surface of the grindstone as desired, thereby to maintain a constant processing time and at the same time to equalize the state of the polished surface.

In order to achieve the above object, the present invention firstly provides an expansion pressure for expanding and moving a grindstone installed in a honing tool toward an inner surface of a processing hole, and a pressing pressure against an inner surface of a processing hole caused by the expansion stone. The expansion pressure is changed so that the pressing pressure becomes the set value while maintaining the predetermined relationship set in advance.

Second, expansion pressure generating means for generating an expansion pressure for expanding and moving the grindstone provided in the honing tool toward the processing hole inner surface, and measuring the pressing pressure on the processing hole inner surface by the grinding stone generated by the expansion pressure. The expansion pressure generating means is controlled so that the pressing pressure becomes a set value while maintaining a predetermined relationship between the pressing pressure detecting means and the expansion pressure and the pressing pressure respectively detected by the expanding pressure generating and the pressing pressure detecting means. It is configured to have a control means.

Thirdly, in the second configuration, the pressing pressure detecting means has an inner diameter equal to the machining hole and is constituted by a pressure measuring ring arranged concentrically with the machining hole.

According to the first method or the second configuration, the pressing pressure on the inner surface of the processing hole by the grindstone is maintained at the set value while maintaining the relation with the expansion pressure in the predetermined predetermined relation, so that the processing time for one workpiece At the same time, the state of the finished surface becomes uniform.

According to the third configuration, since the honing tool can be inserted into the processing hole as it is after being inserted into the pressure measuring ring, the shifting operation from the pressure measurement to the honing processing is continuously performed to prevent the deterioration of workability due to the pressure measurement.

An embodiment of the present invention will be described below with reference to the drawings.

1 is a configuration diagram of main parts of a honing machine according to an embodiment of the present invention. The honing tool body (not shown) of the honing processing apparatus is provided with a honing tool 15 so as to be movable and rotatable. A plurality of grindstones 19 are disposed on the outer circumference of the honing body 17 in the honing tool 15, and the grindstones 19 are installed in the honing body 17 to form an inner surface 21a of the workpiece 21 of the workpiece 21. It is mounted on the outer circumference of the shoe 23 that is movable in the direction opposite to the (). In the honing body 17, a movable rod 27 for movable movement, which includes a taper cone 25 for expanding a grindstone, is housed, and the extension rod 27 is provided to a hydraulic source 29 as an extension pressure generating means. By the expansion pressure p.

When the expansion pressure p is applied to the expansion rod 27 while the honing tool 15 is inserted into the processing hole, the grindstone 19 is formed inside the processing hole 21a via the taper cone 25 and the shoe 23. ) Is pressed by a predetermined pressing pressure. In this state, the honing tool 15 rotates simultaneously with the shanghai cylinder and the rotating motor (not shown) as a driving source to perform honing processing. The start and stop of honing processing by driving stop of the upper and lower cylinders and the rotating motor is performed by the control circuit 30.

In the hydraulic pipe 31 between the hydraulic cylinder (not shown) and the hydraulic source 29 provided on the expansion rod 27 side, a valve 33 and a pressure gauge 35 are respectively installed from the hydraulic source 29 side. The hydraulic pressure value corresponding to the expansion pressure p measured by the pressure gauge 35 is input to the expansion pressure control circuit 37 as a control means, and the valve 33 is opened and closed by the expansion pressure control circuit 37. It is controlled so that the expansion pressure p is controlled.

The honing body 17 is provided with an air passage extending in the vertical direction. The air passage constitutes an air nozzle 39 whose lower side is opened to face the inner surface of the machining hole 21a during honing and the upper side is an upper surface. Is opened and connected to the air micrometer 41. The air micrometer 41 blows air from the air nozzle 39 to the processing hole inner surface 21a, whereby the back pressure generated at this time is converted into an electrical signal so that a predetermined processing dimension of the processing hole according to the back pressure is calculated. Is calculated. The calculation circuit 43 outputs a signal to the control circuit 30 to stop the machining operation when the machining hole dimension reaches a predetermined value.

Guide rings 45 and master rings 46 and 49 are provided on the honing half body side not shown above the workpiece 21, respectively. The guide ring 45 has a guide hole 45a for guiding the honing tool 15 when it is inserted into the processing hole. On the other hand, the two mastering (47, 49) has the same diameter as the upper and lower limit of the target hole bore diameter by honing, respectively, the nozzle 39 of the air micrometer (41) and every processing cycle prior to the honing The range of the upper limit value and the lower limit value of the inside diameter of the drill hole is set by receiving air pressure from a nozzle (not shown) located above the nozzle 39.

On the master ring 49, a pressure measuring ring 51 is provided as a pressing pressure detecting means. The pressure measuring ring 51 is the pressing pressure q of the grindstone 19 generated by applying the expansion pressure p to the expansion rod 27 at the time of setting the machining hole inner diameter in the master rings 47 and 49. This measured value is input to the expansion pressure control circuit 37 described above. The expansion pressure control circuit 37 controls the expansion pressure p by opening and closing the valve 35 based on this input value, and controls the expansion pressure p based on these expansion pressures p and the pressing pressure q. Signal processing to start the machining cycle.

As a specific example of the pressure measuring ring 51, as shown in, for example, a perspective view in FIG. 2, a strain is formed on the outer circumferential surface of the ring 53 having the same inner diameter as the guide ring 45 and whose inner and outer circumferential surfaces are polished. One flange of the half bodies 57 and 59 of the ring with the gauge 55 attached or divided into two parts having the same inner diameter as the guide ring 45 and polished as shown in a perspective view in FIG. A rod washer 65 in which voltage is generated by the pressures 61 and 63 may be attached using the bolt 67 and the nut 69. In the third configuration, the other flanges 71 and 73 are fixed by ordinary washers, bolts and nuts.

Here, the relationship between the expansion pressure p applied to the expansion rod 27 and the pressing pressure q of the grindstone 19 generated by the expansion pressure p is two broken lines as shown in FIG. It is normal to be in the area indicated by the oblique line surrounded by the curves a and b. If it is out of this range, proper honing will not be achieved. And pressed by the pressure wheel (19) (q) is a need to set a set value in advance, this embodiment has come to the set point for q _0.

The two curves a, b extends pressure corresponding to each set value q points corresponding to _0, based on the A, B and the set of the straight line with an inclination of ± 3%, A, set value q ₀ at the central portion between the B If P ₀ , the set values at points A and B are 0.95 P ₀ and 1.05 P ₀ , respectively.

5 is a pull chart showing a machining operation including expansion pressure control of the expansion pressure control circuit 37 in the honing processing apparatus described above. First, the honing tool 15 is inserted into the masterings 47 and 49 and the pressure measuring ring 51 as shown in FIG. 1, and in this state, the air nozzles 39 to the masterings 47 and 49 are placed. And air from another air nozzle are calculated by the air micrometer 41 and the calculation circuit 43 of the upper limit value and the lower limit value of the target hole diameter.

At this time, since the expansion pressure p is applied to the expansion rod 27 from the hydraulic source 29, the grindstone 19 gives the pressing pressure q to the pressure measuring ring 51 by the expansion pressure p. It becomes. Here, the expansion pressure p is measured by the pressure gauge 35 and the pressing pressure q is respectively measured by the pressure measuring ring 51 (step 101) and input to the expansion pressure control circuit 37. The expansion pressure control circuit 37 determines whether or not each of the measured values p and q is in the area indicated by the oblique portion in FIG. 4 (step 103). When the measured values p and q are in the oblique region, the valve 33 is opened and closed to change the expansion pressure p, and the expansion pressure P so that the pressing pressure q is equal to the set value q ₀ . ₁ ) is set (step 105). On the other hand, if it is not in the oblique region, the operation is stopped because an abnormality has occurred in the apparatus (step 107).

Next, the expansion pressure P ₁ in which the expansion pressure control circuit 37 is set is 0.95 P _{0. 0 1 1 a b a b 0 1 2}

Claims (3)

While maintaining the relationship between the expansion pressure for expanding and moving the grindstone installed in the honing tool toward the inner surface of the machining hole and the pressing pressure on the inner surface of the processing hole by the grindstone caused by the expansion pressure, the predetermined pressure is maintained. Honing processing method characterized in that the expansion pressure is changed so that the pressing pressure becomes a set value. Expansion pressure generation means for generating an expansion pressure for expanding and moving the grindstone installed in the honing tool toward the inner surface of the hole; Pressing pressure detecting means for measuring the pressing pressure against the inner surface of the processing hole due to the grindstone caused by the expansion pressure; And a control means for controlling the expansion pressure generating means such that the pressing pressure is set while maintaining a predetermined relationship between the expansion pressure and the pressing pressure detected by the expansion pressure generating means and the pressing pressure detecting means, respectively. Honing processing device, characterized in that. The method of claim 2, The pressing pressure detecting means is a honing apparatus, characterized in that the inner diameter is the same as the processing hole, and made of a pressure measuring ring arranged concentrically with the processing hole.