JP2004025357A - Casting fin grinding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely remove casting fin without causing an excessive grinding even if a grinding surface is shifted from a regular position. <P>SOLUTION: This casting fin grinding device has a tool 3 for supporting a cast product 1 and carrying the cast product 1 to a grinding position; and a grinding wheel 5a for grinding the casting fin of the cast product 1 in the grinding position. Prior to the start of grinding, the position of the grinding surface 1a of the cast product 1 carried in the grinding position is measured by a measuring means 7. Accordingly, the slippage between the grinding surface 1a and the regular position is detected, and a correcting processing for solving the slippage by the sliding movement of the grinding wheel 5a or the rotating movement of the tool 3 is performed. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flash grinding apparatus for removing flash of a casting by grinding.
[0002]
[Prior art]
On the surface of the casting, the hot water that has entered the small gap between the dies may solidify to form burrs (burrs). This flash needs to be removed by some method. For example, in a cylinder block of an automobile engine, the flash is removed by grinding.
[0003]
FIG. 3 is a plan view showing a schematic structure of a conventional flash grinding device for a cylinder block. In this apparatus, a workpiece 21 (cylinder block), which is a cast product, is carried into a grinding position while being positioned and supported by a jig 23. When the work 21 is carried into the grinding position, the grindstones 25a arranged on both sides in the transport direction advance by a predetermined amount, respectively, and grind the surfaces 21a on both sides of the work 21 to remove the flash. Like that.
[0004]
[Problems to be solved by the invention]
However, in the conventional structure, when the surface to be ground is deviated from the normal position due to a positional deviation at the time of setting the work on the jig 23 or a dimensional variation of the work itself, these events are not particularly dealt with. In some cases, the burrs remained after the grinding and had to be reworked later, or over-grinding sometimes occurred.
[0005]
Therefore, an object of the present invention is to provide a flash grinding device that can reliably remove flash without causing excessive grinding even when the surface to be ground is displaced from a normal position.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a jig for supporting a cast product and carrying the cast product to a grinding position, and a grinder for grinding the cast product at the grinding position are provided. Before starting the grinding, the position of the surface to be ground of the cast product carried into the grinding position is measured to detect a deviation from the normal position, and a correction process for eliminating the deviation is performed. The position measurement of the surface to be ground can be performed, for example, by bringing a plurality of contacts into contact with the surface to be ground while avoiding a portion where the burrs occur, and measuring the movement amount of each contact at that time. .
[0007]
The correction process can be performed by a sliding motion of a grindstone. For example, it can be performed by changing the forward slide amount from the standby position to the grinding start position by the sliding movement of the grindstone, or changing the standby position of the grindstone with the forward slide amount unchanged.
[0008]
Further, the above-mentioned correction processing can also be performed by rotating the jig. The rotational movement of the jig and the sliding movement of the grinding wheel may be used in combination.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described using a cylinder block (typically made of cast iron or an aluminum alloy) of an automobile engine as an example of a casting.
[0010]
FIG. 1 is a plan view showing a schematic configuration of a flash grinding device according to the present invention. As shown in the drawing, the apparatus is loaded with a jig 3 for supporting a workpiece 1 which is a cast product in a positioned state, a grinding unit 5 having a grindstone 5a opposed to a ground surface 1a of the workpiece 1, and the like. Measuring means 7 for measuring the position of the ground surface 1a of the work 1; The jig 3 is guided by the guide rail 9, and is conveyed from a previous process to a grinding position (a position where the grinding is performed by the grinding unit 5) shown in FIG.
[0011]
The grindstone 5a is a disk having a rotation axis in a direction orthogonal to the surface 1a to be ground. By pressing the end face of the whetstone against the ground surface 1a, the flash generated on the ground surface 1a is removed. The grinding wheel 5a performs a sliding motion in a direction approaching and separating from the ground surface 1a by a slide mechanism (not shown) provided in the grinding unit 5.
[0012]
In the illustrated example, both side surfaces (the side surface on the intake side and the side surface on the exhaust side) of the work 1 are the ground surfaces 1a, but other surfaces (upper and lower surfaces, etc.) are also ground according to the type and shape of the work 1. Plane. In this case, the grinding units 5 are provided corresponding to the surfaces to be ground 1a, and one grinding unit 5 is provided for one surface to be ground, and the same number of grinding units 5 is provided for a plurality of surfaces to be ground. 1 are provided around each other.
[0013]
The jig 3 is driven to rotate about a rotation axis O in a vertical direction (vertical direction on the paper) by a rotation driving mechanism (not shown). The rotation axis of the jig 3 passes substantially through the center of the work. By rotating the jig 3 in this manner, the work 1 supported by the jig 3 can be rotated on a horizontal plane.
[0014]
The measuring means 7 allows the contact 7a provided at the tip to move forward and backward in a direction approaching / separating from the surface 1a to be ground of the work 1, and to bring the contact 7a into contact with the surface 1a to be ground. , The position coordinates are detected. The measuring means 7 is arranged at a plurality of locations (two locations in the illustrated example) for each ground surface 1a. Each measuring means 7 is arranged so as to avoid interference with the casting when the contact 7a is brought into contact with the surface to be ground 1a so as not to interfere with the casting. Generally, since the burrs are generated at fixed positions on the surface to be ground 1a, it is easy to avoid the burrs and bring the contact 7a into contact with the surface to be ground 1a. The measurement data from the measuring means 7 is transmitted to a control device (not shown), and the position and posture of the surface to be ground 1a are specified by performing predetermined arithmetic processing. The output signal from the control device is input to the rotation drive mechanism of the jig 3 and the slide mechanism of the grinding unit 5.
[0015]
Hereinafter, a procedure of grinding by the above-described cast grinding apparatus will be described.
[0016]
The work 1 is carried into the grinding position shown in FIG. 1 while being positioned on the jig 3. When the work 1 is carried in, the contact 7a of the measuring means 7 advances toward the work 1 and comes into contact with the ground surface 1a. The amount of movement of the contact 7a at this time is transmitted to the control device as position data. The controller recognizes the amount of deviation of the ground surface 1a from the normal position based on the position data from each contact. When the shift is recognized or when the shift amount is equal to or more than a certain value, a correction signal for a correction process for eliminating the shift is transmitted to the slide mechanism of the grinding unit 5 and the rotation mechanism of the jig 3.
[0017]
For example, as shown in FIG. 2A, when the setting position of the work 1 is shifted in the rotation direction with respect to the jig 3 (the normal position is indicated by a broken line), the control device rotates the jig 3. A correction signal is sent to the mechanism, and the jig 3 is rotated in a direction in which the displacement is eliminated (a direction in which the ground surface 1a is parallel to the end surface of the grindstone 5a), as shown in FIG. As a result, the position of the surface 1a to be ground coincides with the normal position, and thereafter, if the grinding wheel 5a of the grinding unit 5 is slid forward by a predetermined amount and then ground, the remaining grinding after grinding and over-grinding may occur. Thus, the ground surface 1a can be reliably ground.
[0018]
Further, as shown in FIG. 3, when the workpiece 1 is displaced laterally with respect to the jig 3 (when the ground surface 1a is at a position shifted in parallel from the normal position), the slide mechanism of the grinding unit 5 is moved. , The whetstone 5a is slid in the forward or backward direction by an amount that can eliminate the lateral displacement (correction slide), and the standby position of the whetstone 5a is corrected. After that, if the grindstone 5a is slid by a specified amount, it is possible to reliably remove the flash while avoiding over-grinding as described above. In addition to correcting the standby position of the grindstone 5a in this way, by adding the corrected slide amount to the specified forward slide amount while leaving the standby position unchanged, the forward slide amount of the grindstone 5a from the standby position is corrected. Is also good.
[0019]
Further, when the displacement in the rotation direction shown in FIG. 2A and the lateral displacement shown in FIG. 3 are combined, the measuring device 7 recognizes the displacement amount in the same manner as described above, and based on this, the jig is used. By performing each of the above-described correction processes by both the rotation mechanism 3 and the slide mechanism of the grinding unit 5, such a shift can be eliminated or reduced.
[0020]
As described above, not only when the workpiece 1 positioned on the jig 3 is misaligned, but also when the ground surface 1a is displaced from the normal position due to a shape error of the workpiece 1, the same as above. By performing the correction process described above, it is possible to reliably remove the burrs while preventing over-grinding.
[0021]
In addition, there may be a case where the inclination of the ground surface 1a (inclination with respect to the vertical surface) causes a positional deviation from the normal position. If the inclination of the jig is corrected by the inclination adjusting mechanism so that the deviation can be eliminated after measuring the deviation in the inclination direction by the measuring means 7, it is also possible to reliably remove the burrs while preventing over-grinding. it can.
[0022]
【The invention's effect】
As described above, according to the present invention, since it is possible to reliably remove the burrs while preventing over-grinding, it is possible to eliminate the need for rework in the post-process, thereby improving production efficiency, and improving product quality. It becomes possible.
[Brief description of the drawings]
FIG. 1 is a plan view showing a schematic structure of a flash grinding device according to the present invention.
FIGS. 2A and 2B are plan views showing a procedure for correcting the position of the surface to be ground by the above-described apparatus, wherein FIG. 2A shows a state before the position is corrected, and FIG.
FIG. 3 is a plan view illustrating a state of a positional shift of a work;
FIG. 4 is a plan view showing a schematic structure of a conventional flash grinding device.
[Explanation of symbols]
1 Work (casting)
1a Surface to be ground 3 Jig 5 Grinding unit 5a Grinding stone 7 Measuring means 7a Contact 9 Guide rail

Claims (3)

A jig for supporting the cast product and carrying the cast product to the grinding position, and a cast grinding device including a grindstone for grinding the cast product at the grinding position,
Before starting the grinding, the position of the surface to be ground of the cast product carried into the grinding position is measured to detect a deviation from the normal position, and a correction process for eliminating this deviation is performed. Burring machine. The apparatus according to claim 1, wherein the correction processing is performed by a sliding motion of a grindstone. The apparatus according to claim 1, wherein the correcting process is performed by a rotational movement of a jig.

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