JPH11156527A - Gate grinding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently grind a workpiece having two or more gates by installing a biaxial transfer means which advances, retreats, traverses a workpiece holding part for grinding and a rotation means which mates the holding part to the plural gate positions. SOLUTION: The holding part 1 composed of a positioning jig 11 and a toggle clamp 12 holds the workpiece. A gate of the workpiece is made to advance and approach to an end face of a belt grinder by a holding part transfer means 2 and then, is ground by such a contact movement as an action to transverse from a center portion of the grinder to the other end face. After that, the workpiece is retreated and rotated to grind the other gate thereby the other gate is made to advance and approach to the other end face of the grinder so that it is ground by a contact movement from the center part of the grinder to the other end face. Since a rotary activate mechanism is provided, a gate of a cylindrical shape workpiece can also be ground into a circular shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for polishing and finishing a gate of a lost wax precision casting.

[0002]

2. Description of the Related Art A gate polishing operation of a lost-wax precision casting is performed by separating a product radially attached from a runner from a gate portion, and then polishing the remaining gate portion in the product portion using a belt grinder, a grindstone, or the like. It is. An example in which this is implemented as an apparatus is disclosed in Japanese Patent Application Laid-Open No. 4-13559, but this apparatus is an apparatus for automatically polishing a gate at one location and cannot be applied to a product having two or more gates. Things. Further, the operation of the apparatus requires a complicated mechanism for moving both the holding portion of the workpiece and the belt grinder as the processing means.

A method using a general-purpose articulated robot is also conceivable. However, since a holding method and an operating method suitable for a product are complicated, when the method is applied to a small number of products, the work efficiency is poor, and replacement of the holding tool is required. There is a problem that it takes a lot of man-hours.

[0004] Therefore, in the work of polishing a sprue of a product having a plurality of sprues, the work is mainly performed by manually gripping the product and polishing the sprue by a grinder, and there has been a strong demand for implementing this work as an apparatus.

[0005]

It is desirable that the lost-wax precision casting has a gate at least one as much as possible, but there are many products at two or more locations. Accordingly, an object of the present invention is to provide an apparatus for polishing a workpiece having two or more gates with a simple mechanism.

[0006]

SUMMARY OF THE INVENTION In view of the above, the present invention provides a two-axis moving means for advancing, retreating, and traversing a holder for holding a workpiece, and a plurality of the holders. The present inventors have found that the operation of polishing a workpiece having two or more gates can be performed by a device having a simple structure by simplifying the rotating means for rotating to adjust the position of the gate. In addition, the gate section can be freely set at the position of the belt grinder by the holding section moving means and the holding section rotating means, so that the wear of the polishing belt can be reduced.

That is, the present invention provides a holding portion for holding a workpiece having two or more gates, a belt grinder for polishing the gate of the workpiece, and bringing the holding portion close to and in contact with the belt grinder. A holding part moving means for moving the holding part and a holding part rotating means for rotating the holding part. The holding part moving means moves the gate of the workpiece forward and close to the end face of the belt grinder, and then moves the central part of the belt grinder. Polishing by contacting and moving from the other end face to the other end face, then the holding section moving means and the rotating means retreat the workpiece, and then the holding section moving means moves the other gate forward and close to the belt grinder opposite end face, Then, another gate is polished by contacting the center portion of the belt grinder with the other end surface, thereby polishing the gate.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, the feature of the present invention is that the operation of polishing a workpiece having two or more gates can be simplified by a combination of movement and rotation. And that the wear of the polishing belt of the belt grinder can be reduced.

Next, the present invention will be described in detail with reference to embodiments and drawings. FIG. 1 is a front view showing an embodiment of a sprue polishing apparatus according to the present invention, and FIG. 2 is a side view thereof. The holding unit 1 for holding a workpiece includes a positioning jig 11 adapted to the workpiece, and a toggle clamp 12 for fixing the positioning jig. An air cylinder 13 is attached to the toggle clamp to automatically fix a workpiece. The toggle clamp may be of a manual type without an air cylinder. The holding part moving means 2 includes a uniaxial servomotor 21 that moves back and forth with respect to the belt grinder 3 and an air cylinder 22 that moves in a transverse direction. The holding unit rotating means includes a vane rotor 23 that is rotated. Other operating mechanisms may be used for the air cylinder to be traversed and the vane rotor to be rotated. Next, a specific operation will be described. The workpiece inserted into the positioning jig 11 by hand is
Automatically fixed by a toggle clamp with air cylinder. Next, the holding portion having the positioning jig is moved by the holding portion moving means to move the gate of the workpiece forward and close to the end surface of the belt grinder, and then to traverse from the center portion of the belt grinder to the other end surface so as to contact and move. Grind. Then, to grind other gates,
The work piece is rotated backward, another gate is advanced and approached to the opposite end face of the belt grinder, and the other gate is polished by moving it from the center of the belt grinder to the other end face. At this time, since the contact portion between the gate and the polishing belt is a portion close to the whole in the width direction of the polishing belt, the wear of the polishing belt can be reduced.

The above operation is for the polishing operation of two gates. However, since the rotary operation mechanism is provided, the gate of the cylindrical workpiece is formed in a circular shape along the shape. It can also be polished. Further, it is possible to cope with two or more gates by moving and rotating two axes.

Although the present apparatus uses a belt grinder for the polishing operation, other polishing means such as a rotary grindstone may be used from the viewpoint of the material and hardness of the workpiece. Belt grinders are common because of their structure, cost and scope, and it is preferred to use them.

[0012]

According to the present invention, it is possible to automatically and efficiently polish a gate of a workpiece having two or more gates. Further, since the operation is structurally simple, even if the shape of the workpiece changes, it is possible to cope with only the jig shape, and it can be said that the polishing apparatus has versatility.

[Brief description of the drawings]

FIG. 1 is a front view of an automatic polishing apparatus according to the present invention. (Belt grinder omitted)

FIG. 2 is a side view of the automatic polishing apparatus of the present invention.

[Explanation of symbols]

 1: holding unit 2: holding unit moving means 3: belt grinder 11: positioning jig 12: toggle clamp 13: air cylinder 21: single axis servo motor 22: air cylinder 23: vane rotor

Claims (1)

[Claims] In a polishing apparatus for processing and removing a gate of a casting, a holding unit for holding a workpiece having two or more gates, a belt grinder for polishing a gate of the workpiece, and the holding unit And a holding unit rotating unit for rotating the holding unit, wherein the holding unit moving unit moves the gate of the workpiece to a belt grinder. The workpiece is polished by moving the workpiece forward and close to the end face, and then contacting and moving from the center of the belt grinder to the other end face, after which the holding part moving means and the rotating means retreat the workpiece, and then the holding part moving means A sprue polishing apparatus characterized in that a sprue is moved forward and close to an opposite end face of a belt grinder, and then the other sprue is polished by bringing the center of the belt grinder into contact with the other end face. Place.