JPS5959343A - Method for setting origin in cylinder grinding machine - Google Patents

Abstract

PURPOSE:To set automatically an origin by detecting automatically a contact line of a grinding wheel and the outer peripheral surface of a stepped work and a contact line of the grinding wheel and the end face of the work to make these lines reference coordinate axes. CONSTITUTION:When the outer peripheral surface 1a and the end face 1b of a stepped work are simultaneously worked by an angular slide NC cylinder grinding machine, a grinding wheel 11 is adapted to approach the work 1' with a predetermined speed so that the contact of the front face 11a of the grinding wheel with the outer peripheral surface 1a is automatically detected to make the contact line the reference coordinate axis Z. Further the grinding wheel 11 is moved toward the end face 1b and the contact of the end face 1b with the side face 11b is detected and the contact line thereof is made the axis X. Thus, the working origin of the work can be automatically set.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of setting an assumed origin of coordinates on a workpiece when performing VF cutting on the entire proboscis of the workpiece using a cylindrical grinder.

When grinding a cylindrical workpiece with one step, use a cylindrical U.
[Side plates are used. Full circle! ? il) An NC cylindrical grinder on a side plate or a rotating 11 (angular slide circle that simultaneously grinds the outer peripheral surface and end face of a workpiece by moving a stone in one direction) (q M sub-machine, etc.) .

Figure 1 shows the 41M crushing of an angular slide cylindrical grinder. The workpiece 1 is rotatably supported by the main headstock 3 and the tailstock 4.
) and Fig. 7J< . Printer j1
It is held on a freely provided sliding bubble 6. Move the sliding daple 6 to the sliding daple 6! 1 Servo motor 1 for Yamasada 2
0 are connected via the feed twist. The sliding surfaces 7, 8
And for the motor, there is a reed on ped 5, and 2 is for workpiece 1.
+Il+ heart of. On the other hand, it holds a rotating grindstone (hereinafter simply referred to as a grindstone) 11 which is rotated by a motor 13 via a deceleration means such as a pulley or a belt (i11 The stone stand 12 is connected to the sliding surfaces 15' and 16 of the grindstone slide base 14). The grinding wheel head 12 is slidably supported on the grinding wheel head 12.
The servo motor 18 that moves the 2 is the feed screw 17.
connected via.

1 created based on the finishing dimensions of the workpiece 1 using a grinding machine with σi. By applying a rotational drive command to 18, the grinding wheel lI car engages with the workpiece 1 and the workpiece 1 is completely ground.In this case, the sliding direction of the grinding wheel head 12 is θ1 with respect to the axis 2. The grindstone slide base 14 is placed on the bed 5 so that the angle is (〈90°), and the grindstone stand 12't is slid in one direction. It is possible to simultaneously cut 11 edges at 11 angles to the circumferential surface. 1. In the diagram, 1a is the outer circumferential surface of the workpiece 1, and 1b is 1a.
, and P is the intersection point on the burnt surface of 1a and ]b. , also +1. a is a side surface formed on the grinding wheel J1 parallel to 1a, 11b is a side surface formed at an angle with ila parallel to 1b, and P
2it, 11 is the intersection of a and ilb (note that 11'
The tip of the whetstone is 9N6). Since the grindstone 11 formed in this way moves along the straight line connecting 1) I and P2, 1
．． ], a, 1], and b move in parallel, and the outer circumferential surface 1a and end surface 1b of the workpiece 1 can be simultaneously ground by i+I.

All of these operations are performed manually, and the particularly important moment when the grindstone 11 contacts the workpiece 1 is visually confirmed. , a reference coordinate axis is assumed at the point A where the grindstone contacts the workpiece, etc., and the coordinate tlil+ is parallel to the axis of the workpiece.
The process of finding the intersection of the lqi center of the crop and the orthogonal coordinate axis is called Jtj, point setting.

This also applies to cylindrical grinders other than angular slide cylindrical grinders.

However, it is very nerve-wracking to visually confirm the process and make it, so it is extremely tiring and takes a long time. ,
In addition, careful consideration is required to perform visual confirmation work in a short period of time.

Therefore, it is an object of the present invention to provide an origin setting method that eliminates such drawbacks and allows even unskilled workers to easily carry out the work until the grindstone comes into contact with the workpiece in a short period of time. The configuration of the present invention to achieve such an object is such that when a stepped workpiece is ground by a cylindrical grinder, a grindstone and the workpiece are moved relative to each other so that the grindstone touches the outer peripheral surface of the workpiece. While the contact is automatically detected and the contact line is assumed to be one of the reference coordinate axes, the grinding wheel and the workpiece are
J The grindstone is moved relative to the axis of the workpiece, and automatically detects that the whetstone has come into contact with the end surface of the workpiece. It is a standard feature to assume that the other reference coordinate axis is orthogonal to the reference coordinate itl+.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

Figure 3 shows the grinding state of the stepped workpiece 11 shown in Figure 2; and the stepped workpiece 1', where 1c is 1
A and 5F indicate the outer periphery, and 1d indicates an end face perpendicular to the outer periphery 1c. Other parts are indicated by the same signs as those in FIG. 2, and in this embodiment, a case will be described in which the angular slide NC cylindrical grinding machine shown in FIG. 1 is used.

In an angular slide NC cylindrical grinder, multiple cylindrical surfaces and end faces are processed according to control information created in advance. Rotation commands are sent from the control device to the servo motors 10 and 18, and the grindstone 11 grinds the workpiece 1'. At this time, the movement path of the grindstone 11 relative to the workpiece 1' is determined by using the axis 2 of the workpiece 1' as the Z coordinate axis, and setting the X coordinate axis in the direction perpendicular to the axis 2. The tip 11 of the whetstone 11
A common method is to move ′. By the way, when machining a new workpiece for the first time, these coordinates representing the I+1 relative positions of the workpiece and the grinding wheel may be completely unknown, or even if the outline of the coordinates is known, it may be difficult to accurately process the workpiece. is insufficient, and it is necessary to set the coordinates accurately.

As a preliminary step to the origin setting method of the present invention, in FIG. 3, the origin of X is placed on the axis 2 of the workpiece 1', and the origin 2 is placed on the finished surface of the end face 1b. First, move the whetstone head 12 to set the tip 11' to P2'(X02zO)'! to move it. After this, press the button that instructs the control device to start setting the origin. Then, in the order shown in Fig. 4, first grindstone head 1 is
2 starts moving forward at a preset speed (V rmn/MtR). At this time, the workpiece 1' is rotated at a predetermined rotational speed. Eventually, the front surface 11a of the whetstone 11
Since it comes into contact with the outer peripheral surface 1a, the contact is detected and the forward movement of the grindstone head 12 is stopped. In order to detect this contact, a device is provided to detect an increase in the power of the servo motor 13 due to the load applied to the servo motor 13.
Alternatively, an accelerometer that detects changes in rotational acceleration occurring in the workpiece 1' may be provided in step 7) #1. X of the contact line between the forward direction 11a and the outer peripheral surface 1a when the grindstone head 12 is stopped
Let the coordinates be Xl. This contact line is the front 1 on the outer peripheral surface 1a.
Refers to a series of contact points that are formed on the outer circumferential surface la parallel to the axis 2 when the contact points 1a are brought into contact with each other. The grindstone head 12 has stopped +)
-L, it would be better if the output of the device that detects the contact is canceled, but if it is not canceled, the grinding wheel head 12 is moved back by a preset amount of X, so that the front surface 111
1 and the outer circumferential surface 1a is released. Next, the sliding table 6 (the first tip 11 relative to the workpiece 1'
The position of ' is Z-Z, ) is aligned with the axis of the workpiece 1' (move 9 to the right in Fig. 1. Eventually, the side surface 11b becomes
When it comes into contact with b, the above-mentioned contact detection device detects it again and stops the movement of the sliding table 6. The coordinates of the tip 11' at this time are (X+ + X2, Z+
), and the coordinates when the grindstone head 12 is not retreated by X2 as described above are (x+, Z+). (X+,
Z, +) can be arbitrary coordinates, and the control device automatically issues a coordinate conversion command so that 161 becomes the origin [so that the coordinates of the tip of the pick 11' become (X2, 0)]. Convert the coordinates configured within. As a result, the line of contact between the front face 11g and the outer circumferential surface 1a is biaxial, and the straight line perpendicular to the end face 1b, the axis center 2 of the upper sister axis 2, and the Z-axis is X 1I (It. This can be determined by the operator. The origin of the coordinates thus obtained is the intersection point of the finished surface of the outer circumferential surface 1a and the end surface 1b, ie, the intersection point C'', thus completing the setting of the origin (indicated by ■ in FIG. 4).

However, since the dimensions on the drawing, such as the outer peripheral surface 1a, are indicated by diameters, the origin of the
1 is predetermined, the position of the tip 11' at the newly set coordinates when it automatically retreats and stops is (-X
s, Z2). Then, the diameter of the outer circumferential surface 1a is measured, and this measured value is designated as d. Note that the purpose of the retreat of the grinding wheel 11 is to facilitate the measurement work, so the amount of retreat is 0.
It may be. Here, if X is the diameter display coordinate, dl
If it is a radius display coordinate, enter dI/2,
When inputting the machining allowance △2 of the end face 1b, the coordinates of the tip 11' are 75! Coordinate transformation is performed so that (d, +x,, △Z+Z2) (when using diameter display coordinates), and as a result,
The origin of X and Z is set at the origin 141 shown in FIG. 3, that is, on the finished surface of the end surface 1b on the axis 2 (indicated by ■ in FIG. 4).

Note that this origin setting method requires 1. It goes without saying that it can also be applied to the cylindrical grinding machine of J [n]! In addition, since an angular slide cylindrical grinder was used in this example, the origin was set in the order of bringing the grindstone into contact with the outer surface of the workpiece and then contacting the end surface. If it is not a board, the order may be reversed.

Since the grindstone head is stopped, even an unskilled person can set the origin easily, quickly and safely compared to the conventional manual method.

[Brief explanation of drawings]

Figures 1 and 2 are related to the angular slide cylindrical grinder.
, Figure 1 is a structural diagram, Figure 2 is a diagram of the processing principle, Figures 3 and 4.
Fig. 1 shows the origin setting method according to the present invention, and Fig. 3) is an explanatory diagram, and Fig. 4 is a flowchart. In the drawings, 1' is the workpiece, la and lc are the outer peripheral surfaces, 1b and 1d are the end surfaces, 2 is the axis, 11 is the grindstone, 11a is the front, 11 b 1lZj: (IllI surface). Patent applicant Mitsubishi Heavy Industries Patent Attorney Sub-Agent, Patent Attorney Mitsuishi Shibu (and other J names) Figure 1 Old ÷ - Δl

Claims (1)

[Claims] When grinding a stepped workpiece with a cylindrical grinder, the grindstone and the workpiece are moved relative to each other. l (It automatically detects that the stone has contacted the outer peripheral surface of the workpiece and assumes that contact line as one of the reference coordinate axes, while automatically detects that the whetstone has contacted the end surface of the workpiece, and displays the axis of the workpiece and the other reference coordinate axis that is 1119 with the one reference coordinate axis on the contacted end surface. A method for setting the origin of a cylindrical grinder assuming the following characteristics: ff, /l'lI'.