JPS63212466A - Grinding method for numerically controlled cylindrical grinder - Google Patents

Abstract

PURPOSE:To machine the end face and the outer diameter accurately in a short time without stepping the corner by inclining the feeding shaft of grinding wheel against a line crossing perpendicularly with the feeding shaft of table, and controlling the feeding of table through an end face constant dimension device without returning the grinding wheel upon finish of outer diameter. CONSTITUTION:A feeding shaft of grinding wheel 5 is fixed with an angle theta with respect to the direction X crossing perpendicularly with the feeding shaft Z of a table, so as to form the grinding face of the grinding wheel 5 accurately. When grinding is started, the grinding wheel 5 advances with an angle theta from the starting position. Here, the outer diameter finish dimension is employed as a target value in the direction X, while a target point for leaving margin at the end face is employed in the direction Z. Automatic device 8 for setting constant outer diameter detects the position for starting of grinding of outer diameter, finish diameter and end of outer diameter finish dowel, and a motor 2 is controlled. Then end face finish is taken place, where end face finish is started without returning to the starting position, then the motor 1 is controlled to grind a work 6 upto the end face finish dimension with the outer diameter thereof being held as it is, and an automatic device 7 for setting constant dimension of end face detects the finish dimension of end face and the end of end face finish dowel.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application> The present invention relates to a method for controlling a grinding procedure applied to a numerically controlled cylindrical grinder (CNC cylindrical grinder).

<Conventional technology> Numerical fullJIm machine tools that are generally operated using program input data have errors such as thermal deformation and positioning variations, so in order to achieve better product accuracy than that of mechanical systems, it is necessary to An automatic sizing device is used to measure machining dimensions during machining, and the machine tool is controlled by measurement signals from the device to achieve the desired accuracy.

For example, in plunge grinding where an angular-type cylindrical grinder simultaneously grinds the end face and outer diameter, conventional machine tools only control the grinding wheel feed 9 (grinding wheel axis).
The control signal is for one axis, that is, either the outer diameter or the end face.
It is only controlled by two automatic sizing devices.

Therefore, when the required accuracy is strict for both the outer diameter and the end face, the machining is performed by programming the machining block separately into two machining blocks consisting of two sequences. In other words, for finishing the outer diameter, an automatic sizing device is applied to the outer diameter of the workpiece, and a Ni program is created that leaves machining allowance on the end surface. I am creating a Canadian program that leaves a gap between the two. Note that the end face may be finished first.

<Problem that the invention seeks to solve> The above case has the following drawbacks.

(a) Since the two machining blocks are machined separately, for example, the outer diameter is machined in the first block and the end face is machined in the second block, the dimension controlled by the automatic sizing device is the outer diameter (or end face).
In this case, the target value for the other dimension, the end face (or outer diameter), must be larger than the finished dimension to avoid excessive grinding, depending on the machining accuracy of the mechanical system, resulting in a step at the corner. .

(b) Additionally, when machining is performed in two blocks, the machine returns to the starting position after machining the outer diameter (or end face), that is, after completing one machining process, resulting in wasted time and increased cycle time. It will be disadvantageous.

Therefore, the present invention enables control using measurement signals from two automatic sizing devices in one crab block instead of two crab blocks, and allows the outer diameter and end face dimensions to be determined accurately and in a short time. A grinding method using a numerically controlled cylindrical grinder that can perform processing is provided.

Means for Solving the Problems〉 The present invention achieves the above-mentioned objects by aligning the feed axis of the grindstone with respect to a line perpendicular to the feed axis of the table in angular plunge grinding for grinding the end face and outer diameter. The target value in the direction of the end face is set to the value that leaves machining allowance on the end face, and the feed of the grinding wheel is controlled by the measurement signal of the automatic sizing device for outer diameter to finish the outer diameter. After finishing the outer diameter, the automatic sizing device for the end face It is characterized by switching to the measurement signal of the sizing device and controlling the table movement to finish the end face.

<Function> External diameter finishing is the same as before, but after completing the external diameter finishing, the grindstone does not return to the starting position, and the table feed is controlled by the automatic edge sizing device. This improves the precision of both the end face and outer diameter dimensions without creating any steps at the corners, and allows processing to be carried out in a short time.

EMBODIMENTS> The present invention will now be described in detail with reference to FIGS. 1 to 4. Figure 1 shows an outline of a cylindrical grinder.
In Fig. 1, 1 is a motor for driving the table, 2 is a motor for driving a grindstone, 3 and 4 are ball screws that transmit the power of motors 1 and 2 to the table and the grindstone, 5 is a grindstone, and 6 is a workpiece. , 7 is an automatic sizing device for the end face, and 8 is an automatic sizing device for the outer diameter.

In this case, in order to perform plunge grinding of the workpiece 6 with the grindstone 5, the feed axis (grindstone axis) of the grindstone 5 is aligned in the direction X orthogonal to the feed axis (table axis) 2 of the table, as shown in FIG. It is mounted at an angle θ with respect to the Further, the grinding surface of the grindstone 5 is also precisely formed.

On the other hand, the main body of the numerical control device has a CPU as shown in Fig. 3.
l0, interface 1 interface (I/F”) 11.12,1
4. Has RAM 15, ROM 16, and automatic sizing device 7.
The dimensional information from 8 enters the main body of this control device and controls the servo system 13 of the grindstone head and table.

The cycle shown in FIG. 4 is used to control the grinding. First, the starting position A that is input into the RAM 15 at the start of grinding.
From there, the grindstone 5 starts to enter at an angle θ. In this case, the target values are the outer diameter finish dimension in the X direction (outer diameter), the end face finish dimension so that machining allowance remains on the end face (for example, leaving a gap) in the Z direction (plane 111), and the machining accuracy of the machine. The target point is the position that is the sum of the values taken into consideration.

During the grinding operation, when the starting position A reaches position A, dry grinding starts, rough grinding of the outer diameter is performed at position C, fine grinding of the outer diameter is performed at position E, and finished outer diameter dimensions are performed at position E. , and F
It becomes a finishing dwell. In this case, the external diameter automatic sizing device 8 detects the outer diameter fine polishing start position with the signal 81, the finished dimension diameter with the signal 82, and the end of the outer diameter finishing dwell with the signal 83. be done. At this time, machining allowance remains on the end face.

For the grinding operation, the signal of the automatic sizing device 8 for outer diameter is
PUl0 receives via I/F14, I/Fil, 1
2, the grindstone shaft is controlled by a servo system 13, and the grinding wheel is finished to the finished outer diameter dimension.

Next, the end face finishing is started, but in this case, starting position i
Directly start finishing the end face without returning to 1A. That is, next, the CPUIG gives a command to the servo system 13 via 1/Fil, 12, operates the table axis, and moves the workpiece 6.
While maintaining the outer diameter dimension, grinding is performed to the end face finishing dimension G, and then the end face finishing is completed at the finishing dwell H. At this time, the end of the end face finishing dwell is detected by the end face finishing dimension G1 signal 73 in the signal 72 of the automatic end sizing device 7.

In other words, during the end face grinding operation, the automatic sizing value w7 for the end face is
Receives the signal via @CPU 10 Cal/F 14,
control and finish the end face dimensions.

As described above, it is possible to process the end face and outer diameter in one machining sequence.

<Effects of the invention> By obtaining one grinding sequence using automatic sizing devices for end faces and outside diameters using only one cutting block, end faces and outside diameter dimensions can be processed with high precision in a short time. It became like that.

[Brief explanation of the drawing]

1 to 4 are provided for explaining one embodiment of the present invention,
FIG. 1 is a configuration diagram, FIG. 2 is a diagram showing the relationship between a grindstone and a workpiece, FIG. 3 is a schematic block diagram of a control device, and FIG. 4 is an explanatory diagram of a grinding cycle. In the figure, 5 is a grindstone, 7 is an automatic sizing device for the end face, and 8 is an automatic sizing device for the outer diameter.

Claims (1)

[Claims] In angular type plunge grinding that grinds the end face and outer diameter, the feed axis of the grinding wheel is inclined with respect to the line perpendicular to the feed axis of the table, and the target value in the end face direction is set as a value that leaves machining allowance on the end face. Finish the outer diameter by controlling the feed of the grinding wheel using the measurement signal from the automatic sizing device. After completing the finishing of the outer diameter, switch to the measurement signal from the automatic sizing device for the end face, control the feed of the table, and finish the end face. A grinding method using a numerically controlled cylindrical grinder, characterized by the following.