JPH03213260A - Chamfering method of cylinder port for two-cycle engine and chamfering device thereof - Google Patents

Abstract

PURPOSE:To maintain a degree of uniform chamfering accuracy as well as to improve the operation efficiency by setting a fundamental track precalculated out of the drawing data of the like of a port to the traveling route of a grinding wheel, and compensating the traveling route of the stone according to a difference in form and size of the port being secured by detecting the fundamental track and the actual size of the port. CONSTITUTION:When a peripheral part of a two-cycle engine cylinder port 2 is chamfered by a grinding wheel 12 being moved by an automatic control, a fundamental track precalculated out of data or the like of the port 2 is set to a traveling route of the stone 12, and this traveling route of the wheel 12 is compensated by a controller according to a difference in form and size of the port 2 being secured by detecting the fundamental track and the actual size of the port 2 with a sensor 13.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a method and device for chamfering the port of a two-stroke engine cylinder used in two-wheeled vehicles, outboard motors, and the like.

b. Prior Art As is well known, in a two-stroke engine, an intake port and an exhaust port are provided in a cylinder in which a piston is disposed so as to be able to freely reciprocate. Since protrusions and cracks often occur on the peripheral edge of such ports, this area is chamfered, so that when the piston reciprocates inside the cylinder, the piston ring will not touch the peripheral edge of the port. I'm trying not to hit it.

By the way, there are two methods for chamfering the port of a cylinder for a two-stroke engine: manual method, automatic method using a general-purpose robot using a teaching-playback method using an appropriate sample, or a method using a spring-type chamfering tool. Conventionally, a method has been adopted in which the chamfer is roughly chamfered by pressing it against the machined surface using force.

C1 Problems to be Solved by the Invention However, the conventional port chamfering method as described above has the following problems.

In other words, manual methods have poor work efficiency and poor chamfering accuracy, making it difficult to ensure product quality above a certain level.

In addition, in the teaching/playback method using a general-purpose robot, the data is memorized by teaching several points for chamfering at regular intervals, and the chamfering process is performed by inheriting the point information. In order to perform continuous chamfering around the entire circumference of the port, it is necessary to increase the number of point information, which has the disadvantage that the teaching operation for this purpose takes time. Furthermore, the taught point information (point data) itself is not accurate due to inherent variations in the shape and dimensions of the work samples used, and therefore there is a limit to the chamfering accuracy.

Furthermore, the method of chamfering by pressing a chamfering tool against a surface to be machined using a spring force has a problem in that the machining accuracy is relatively poor.

In this way, in the past, the peripheral edge of the cylinder port was chamfered using a relatively simple chamfering method, but none of the conventional methods were sufficient in terms of machining accuracy, machining efficiency, quality, etc. The reality is that it is not a thing.

The present invention has been made in view of the above-mentioned actual situation, and its purpose is to be able to perform uniform chamfering according to the variations in shape and dimensions of individual cylinder ports, and to perform chamfering work. It is an object of the present invention to provide a method for chamfering a cylinder port for a two-stroke engine, which can be efficiently performed in a short time, and a chamfering device for the chamfering method.

d. Means for Solving the Problems In order to achieve the above-mentioned object, the method according to the present invention involves chamfering the peripheral edge of a cylinder port for a two-stroke engine using a grindstone moved by an automatic operation device. The basic trajectory of the grinding wheel is determined based on the variation in the shape and size of the port obtained by detecting the actual dimensions of the port. I am trying to correct the trajectory.

Further, the device according to the present invention includes: (a) a processing head body equipped with a sensor for detecting the position, shape, etc. of a cylinder port for a two-stroke engine, and a grindstone for chamfering the peripheral edge of the port; (c) a movement path determining means for determining a movement path of the grindstone by using a detection signal from the sensor as correction information for the movement path of the grindstone; (C) said processing based on a control signal from said movement path determination means; and a drive means for driving the grindstone of the head main body along a predetermined movement path.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Figures 1 and 2 show a chamfering device 3 for chamfering ports (intake/exhaust ports) 2 of a cylinder (cylinder sleeve) 1 for a two-stroke engine. A control device 4 having means, and a processing head main body 5 based on control signals from the control device 4.
and a drive device 6 that drives the.

As shown in FIG. 2, the above-mentioned drive device 6 includes a θ-axis direction rotation drive section 7 that constitutes a base section, and an X-axis direction linear drive section 8 disposed on the upper surface of this rotation drive section 7. and a Y-axis direction linear drive section 9 disposed on the top surface of this linear drive section 8,
The linear drive unit 9 includes a Z-axis linear drive unit 10 disposed on the upper surface of the linear drive unit 9, and a processing head main body 5 attached to the linear drive unit 10. In addition, here
ring.

The Y axis and the Z axis are directions that make 90 degrees to each other.

As shown in FIGS. 2 and 3, the processing head body 5 described above has a hemispherical grindstone 12 rotatably attached to the side surface of the upper end portion of the spindle head 11, and a sensor 13 attached to the upper end surface. The grindstone lO and the sensor 13 are oriented in opposite directions. and,
This grindstone 12 is configured to be rotationally driven by the Z-axis direction linear drive section IO and a rotary drive mechanism 14 disposed in the spindle head 11.

Further, the above-mentioned control device 4 is for automatically controlling the drive device 6, and as shown in FIG.
, day play device 18, and interface port 1
9, a power supply 20, and drive parts 7, 8, 9 .
10 in the θ-axis direction, X-axis direction, Y-axis direction, and Z-axis direction to perform position control ml.
．． 22, 23, and 24, a motor driver 25 that controls the rotational speed of the grindstone 12 of the chamfering device 3, and a sensor amplifier 26 that amplifies the detection signal from the sensor 13 of the chamfering device 3.
and an emergency stop switch 27.

The chamfering operation of the port 2 of the two-stroke engine cylinder 1 is performed using the above-mentioned chamfering device 3 in the following manner.

First, the design drawing or C of the cylinder l to be chamfered.
^Obtain basic data from data. This basic data includes ■~0 (Figure 4) described below.

(see FIGS. 5 and 6) are given as examples.

0 Inner diameter of cylinder 1 a ■ Circumferential position of port 2 with respect to reference point P of cylinder 1 b O Height position of port 2 with respect to cylinder 1 C ■ Radius of four corners of port 2 d ○ Center position of the radius e ■ Chamfering width f of the upper and lower edges of port 2 @ Chamfering angle of the left and right edges of port 2 go Chamfering angle of the upper and lower edges of port 2 Enter these data into the computer. is input, and based on a predetermined calculation method, the movement path (trajectory) in the three-dimensional space that the hemispherical grindstone 10 should pass during chamfering is calculated. Then, the calculation results are stored in a non-volatile memory as a basic trajectory for chamfering each cylinder l. Note that the work up to this point is performed only using drawing data or CAD data without actually using the cylinder (workpiece) as the object to be processed.

After the basic data reading process is completed, the cylinder 1 is chamfered. To explain the operation in this case in detail, first, the cylinder l to be chamfered is
is placed and fixed on two predetermined IF tables 8 as shown in FIG. When a predetermined operation start signal is input to the computer, the grinding wheel 12 and the sensor 13 are moved together with the spindle head 11 into the cylinder 1, and the sensor 13 is placed corresponding to the port 2 of the cylinder 1 as shown in FIG. . Along with this, the shape and dimensions of the port 2 are detected by the sensor 13, the detection signal is input from the sensor 13 to the computer via the amplifier 26, correction data is obtained by calculation based on the detection signal, and the movement route is determined. In the determining means, the basic trajectory is corrected according to this correction data.

Next, the spindle rad 11 is rotated approximately 180 degrees around its axis, and the grindstone 12 is placed correspondingly to the port 2 as shown in FIG. At the same time, the rotation drive mechanism 14 is activated to rotate the grindstone 12 at high speed, and the grindstone 12 moves along the peripheral edge of the port 2 along with the grinder 11 to the spindle as shown by the arrow in FIG. be done.

The movement path (trajectory) of the grindstone 12 at this time is the θ axis.

It is determined by computer control of the X-axis, Y-axis, and Z-axis direction drive units 4, 5, 6, and 7, but in this example, it was determined by desk calculation from basic data determined in advance as described above. In principle, the basic trajectory is followed, and the trajectory is corrected according to the shape and dimensions of the port 2 of each cylinder 1 during actual chamfering.

That is, the grinding wheel 12 is moved using a trajectory obtained by adding corrections according to variations in the shape and dimensions of the ports 2 of the individual cylinders 1 to the basic trajectory already stored in the computer, using the trajectory as the actual movement path. ing.

Furthermore, in this embodiment, the basic trajectory is equally divided into four parts A, B, C, and D as shown in FIG. Among the peripheral parts of , the center part 2 of both upper and lower edges
9.30 and the center portions 31.32 (smooth portions) of both left and right edges are connected with a straight line, or the ends of adjacent sections are overlapped. As a result, the chamfering radius etc. can be kept constant.

According to the chamfering method described above, the chamfer can be processed into the required shape and dimensions, and the shape of the port 2, where the port 2 is misaligned with respect to the cylinder l, is not uneven. Also, the sensor 13 for detecting the actual size
Since the correction processing is performed based on the detection signal from the port 2, the chamfering processing of each port 2 can always be maintained at a constant dimensional accuracy. That is, by employing data on inherent variations in the ports 2 of the cylinder 1 to be chamfered as correction values for the variations, the chamfer width of the ports 2, etc. can be kept constant according to each port 2.

In addition, the time required to calculate the motion trajectory of the grinding wheel 12 during processing is longer than the time actually required for the grinding wheel 12 to perform chamfering, so if processing is performed while calculating, the processing will take a long time. However, in this embodiment, all complicated calculations are completed before processing based on the drawing data of port 2, etc., and the grinding wheel 12 is operated based on the basic data obtained from the calculation results. Therefore, during actual chamfering processing, the grinding speed of the grindstone 10 can be set to an ideal value, resulting in good work efficiency.

Furthermore, according to the chamfering device 3 of this embodiment, since the grinding wheel 12 and the sensor 13 are attached to the spindle head 11 of the processing head main body 5, the spindle head 11 can be rotated 180 degrees immediately after the actual size of the port 2 is detected. Let's whetstone 1
Chamfering can be started at step 2. In this way, the functions of detecting the actual size of the port 2 and chamfering are performed using the same spindle head 11 (operating axis), so a separate operating axis is not required.

Although one embodiment of the present invention has been described above, the present invention is not limited to the embodiment described above, and various modifications and changes can be made based on the technical idea of the present invention.

For example, in the previously described embodiment, the basic trajectory is calculated in advance based on the drawing data of port 2, but it is also possible to calculate the basic trajectory in advance based on the CA data or other design data. Good, also the grindstone 12 and sensor 13
It is not necessarily necessary to mount the spindle head 11 at a position offset by approximately 1801 degrees, and it is possible to arrange it as appropriate.

e. Effects of the Invention As described above, according to the chamfering method according to the present invention, the movement path calculated in advance from drawing data of the port, etc. is used as the basic trajectory of the grindstone, and the actual size of the port is obtained by detecting the basic trajectory of the grindstone. Since the basic orbit of the grinding wheel is corrected according to variations in the shape and dimensions of the ports, even if there are inherent variations in the shape of the reports where the ports are misaligned with respect to the cylinder, each port By chamfering according to the chamfering process, the chamfer width etc. can always be kept constant, and uniform chamfering accuracy can be maintained. Moreover, since time-consuming and complex calculations are calculated in advance based on drawing data, etc., the grinding speed of the grinding wheel (tool) can be set to the ideal speed during actual chamfering. Chamfering can be performed efficiently.

Furthermore, according to the chamfering device according to the present invention, since the sensor for detecting the position, shape, etc. of the port and the grinding wheel for grinding are attached to the same processing head body and these are automatically operated, the actual size of the port Chamfering work can be started immediately after detection, and operability and work efficiency are very good. In addition, since the sensor for detecting actual dimensions and the grindstone for chamfering are automatically operated by the same operating axis, there is no need to provide separate operating axes for each, which has the advantage of simplifying the configuration. .

[Brief explanation of drawings]

The drawings are for explaining one embodiment of the present invention, and FIG. 1 is a configuration diagram of a chamfering device for a port of a two-stroke engine cylinder, and FIG. 2 is a configuration diagram of a drive device for a processing throat main body. , Fig. 3 is a perspective view of the machining head body placed inside the cylinder, Fig. 4 is a perspective view of the cylinder, Fig. 5 is a front view of the port of the cylinder as seen from the inner circumferential side, and Fig. 6 is the port. Fig. 7 is a plan view showing a state in which a sensor detects the shape of the port, etc. Fig. 8 is a plan view showing a state in which a grindstone is used to chamfer the port. FIG. 9 is a perspective view similar to the above, and FIG. 10 is a perspective view showing a moving path (trajectory) of the grindstone relative to the port. DESCRIPTION OF SYMBOLS 1... Cylinder for two-stroke engine, 2... Port, 3... Chamfering device, 4... Control device having a movement path determining means, 5... Processing head device, 6... Drive device , 7... θ-axis direction rotational drive section, 8... X-axis direction linear drive section, 9... Y-axis direction linear drive section, 10... X-axis direction linear drive section, 11... Spindle Head, 12... Grindstone, 13... Sensor, 14
...Rotary drive mechanism, 15...Computer main body. Patent applicant Suzuki Motor Co., Ltd. (and 2 others) Figure 1 Figure 2 Figure 7 Figure 8 Figure 10 Procedural amendment (voluntary) Indication of the case 1990 Patent Application No. 9854 Name of the invention 2 cycles Name related to the case of a person who corrects the chamfering of an engine sealing method and chamfering device port (208)

Claims (2)

[Claims] (1) When chamfering the peripheral edge of a cylinder port for a two-stroke engine using a grindstone moved by an automatic operation device, a movement path calculated in advance from drawing data of the port is used as the basic trajectory of the grindstone, and the A method for chamfering a cylinder port for a two-stroke engine, characterized in that the basic trajectory of the grindstone is corrected according to variations in the shape and dimensions of the port obtained by detecting the actual dimensions of the port. (2) (a) A processing head body equipped with a sensor for detecting the position, shape, etc. of a cylinder port for a two-stroke engine, and a grindstone for chamfering the peripheral edge of the port; (b) From the sensor a movement path determining means for determining a movement path of the grindstone using the detection signal as correction information for the movement path of the grindstone; (c) a predetermined movement of the grindstone of the processing head main body based on a control signal from the movement path determination means; A chamfering device for a cylinder port for a two-cycle engine, characterized in that the device comprises: a driving means for driving along a moving path; and a chamfering device for a cylinder port for a two-stroke engine.