JP2521711Y2 - Mold deburring tool holder - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention relates to a shell core manufactured by die molding.
The present invention relates to a mold deburring tool holder of a deburring apparatus used for cutting and removing sand burrs generated at a split surface position of a mold.

[Prior Art] As a mold deburring apparatus, there are JP-A-59-214509, JP-A-49-92689 and JP-A-62-292352.
There are those shown in Japanese Patent Publication No.

And among these, the cutting blade is attached to the rotating shaft of the rotating tool, and by rotating the rotating tool in a predetermined motion, the rotating cutting blade is used to scrape off the burrs protruding around the mold. I have.

Further, a flywheel is concentrically fixed to a shaft of a cutting tool fixed to a rotary shaft of a rotary tool, and the rotary tool is supported on a fixed frame side via a gyro mechanism. In addition to utilizing the inertial action of the wheel, the gyro moment of the gyro mechanism causes the cutting tool to be pressed against the workpiece.

Further, the rotating tool is connected to the holder via an elastic cushion member.

This also describes a shank having a cross-shaped mounting portion and a shaft portion fixed to an intersection of the mounting portion, and a deburring device in which a grindstone or a file is fixed to each end portion of the mounting portion. However, this device is of a pressing and moving type, and the shank does not rotate but moves while pressing against a portion to be processed via an elastic cushion member made of rubber, which is an elastic body.

[Problems to be solved by the invention]

In the mold deburring apparatus described in the above prior art, since the deburring blade is directly fixed to the rotating shaft of the rotary tool, the size of the burr on the mold surface is large and small. When there is unevenness on the surface of the object, the vibration acting on the cutting tool directly impacts on the rotating tool side, and the rotating tool is attached to the tip of the operating part of an automatic control machine such as a deburring robot In the case of work, there is a problem that it is deviated from the teaching route.

In this method, a flywheel is fixed to a rotating shaft as in the above-mentioned conventional technology, and a centrifugal force is applied to the cutting tool by the inertia force of the flywheel so as to keep the axis of the cutting tool constant, and a gyro moment by a gyro mechanism is provided. The same applies to the case where the tool is used, and even if an attempt is made to hold the trajectory of the cutting tool in a teaching manner by the bending angle, the inertia force of the flywheel, and the gyro moment of the gyro mechanism, a large unevenness of the surface of the workpiece is caused. There has been a problem that the above-mentioned trajectory is shifted due to an impact force.

On the other hand, in the conventional art, the rotary tool is connected to the holder side via an elastic cushion member, and is pressed against a workpiece through the elastic cushion member. Although the above-mentioned impact force can be absorbed by the member, in this conventional technique, since the rotary blade is located coaxially with the rotation center of the tool holder, the rotary blade is moved in the traveling direction during the burr cutting. Vibration along is not positively generated, but simply removes burrs with the cutting force due to the rotation of the rotary blade,
Deburring efficiency was poor.

In this press-moving type, an effective deburring effect could not be expected because the grindstone simply moved by pressing through a rubber elastic cushion member.

The present invention has been made in consideration of the above, and particularly relates to an improvement of a mold deburring tool holder in which a flywheel is fixed to a rotating shaft of a rotary tool together with a cutting tool. The deburring blade is elastically abutted against the surface, so that the impact force due to the unevenness of the surface of the workpiece such as the shell-type surface can be absorbed by the elastic cushion member, and the dimensional variation of the surface of the workpiece. In addition, it can be absorbed within a range where there are various variations such as variations in the set to the mold, or variations due to wear of the cutting tool, and a good finished surface can be stably secured.Moreover, the cutting tool is used while bending the elastic cushion member. When pressed against the surface of the workpiece, the cutting tool rotates and moves along the workpiece surface with a stroke corresponding to the offset position of the cutting tool from the center of rotation of the tool holder. A mold deburring tool holder that reciprocates and allows the workpiece surface to be shaved off by both rotating and reciprocating motions of the cutting tool, thereby significantly improving the burr cutting efficiency on the workpiece surface To provide.

[Means and actions for solving the problem]

[Means] To achieve the above object, the present invention attaches a chucked member held by a tool chuck to a base end portion of a tool holder via an elastic cushion member, and attaches this member to the tool holder. Provide a flywheel concentric with the center of rotation of the tool holder, and at the tip of the tool holder,
In addition, the blade is mounted at a position deviated from the center of rotation.

[Action]

The chucked member of the mold deburring tool holder is gripped by a tool chuck of, for example, an articulated robot and rotated, and the sand burr on the shell-type surface is scraped off by the blade.

In this case, a centripetal force acts on the flywheel due to an inertial force, and a force acts to keep the axis (Y-Y 'axis) of the tool holder on a straight line. The shell type that was finished in advance to actually remove the sand burr was used as the master work,
The trajectory is stored in the robot. And in this case,
The point is stored so that the cutting tool hits the inner side within a certain range from the workpiece surface. When the trajectory is reproduced in such a state and run on the surface of the workpiece, the cutting tool is pushed by the surface of the workpiece, refracts in the shape of a "ku" from the center of deflection of the elastic cushion member, and escapes in the opposite direction. However, on the other hand, the cutting tool constantly exerts a force for keeping the YY 'axis in a straight line by a centripetal force due to rotation, and as a result, a pressing force acts on the side surface of the workpiece surface. Therefore, if there are protrusions such as sand burrs on this surface, the vehicle will run while shaving off.

At this time, the cutting tool attached to the tip of the tool holder is eccentric with respect to the center of rotation,
The cutting tool is eccentrically rotated. And this blade is pressed against the surface of the workpiece via the elastic cushion member,
The cutting tool reciprocates along the surface of the workpiece with a stroke corresponding to the eccentric amount, and the surface of the workpiece is shaved by both the rotating operation and the reciprocating operation of the tool.

〔Example〕

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

FIG. 1 shows the structure of a mold deburring tool holder A according to the present invention. The mold deburring tool holder A has a holder body 1, and a flywheel part 3 is formed at the base end of an axial tool holder part 2 of the holder body 1. A cushion mounting portion 4 is formed at the base end portion.
Elastic cushion member 5 such as rubber is attached to
The shaft body 6 which is a member to be chucked is held via the elastic cushion member 5.

The flywheel 3 and the shaft 6 are aligned with the axis of the tool holder 2. A cutting tool mounting portion 7 'is formed at the tip of the tool holder portion 2, and the cutting tool 7 is mounted on the cutting tool mounting portion 7'. The cutting tool 7 is slightly moved with respect to the axis of the tool holder 2, for example, δ =
Eccentric over 0.5mm.

Mold deburring tool holder A configured as described above
Is such that the disk surface (XX axis) of the flywheel 3 and the axis (YY 'axis) of the tool holder 2 are geometrically perpendicular to each other.

This mold deburring tool holder A is
It is rotated by being clamped to a chuck 8 'of an air or electric grinder apparatus. Then, the tip blade 7 also rotates. At this time, since the cutting tool 7 is eccentric with respect to the rotation center of the mold deburring tool holder A, the cutting tool 7 is eccentrically rotated.

When the cutting tool 7 is pressed against the sand burr 9 of the shell mold 8 in this state, the cutting tool 7 comes into contact with the sand burr 9 of the shell mold 8 while bending the elastic cushion member 5, and the cutting tool 7 is adjusted according to the eccentric amount. The shell mold 8 is rotated while being reciprocated along the sand burr 9 with a stroke.
Sand burr 9 is shaved off. In this case, a centripetal force acts on the flywheel 3 due to the inertial force, and a force acts to keep the YY ′ axis on a straight line. At this time, when the sand burrs 9 of the shell mold 8 have a large uneven shape,
This unevenness is absorbed by the elastic cushion member 5.

Actually, a shell type previously finished in order to scrape off the sand burr 9 is used as a master work, and the locus is stored in the robot. Moreover, in this case, the point is stored so that the cutting tool 7 strongly hits the inner side within a range of about 0.5 to 1 mm from the surface of the shell mold 8. When the locus is reproduced in such a state and runs on the side surface of the shell mold 8, the cutting tool 7
, The holder main body 1 is bent from the swing center P of the elastic cushion member 5 into a "<" shape with respect to the chuck 8 ', and escapes in the opposite direction. On the other hand, on the other hand, the cutting tool 7 constantly exerts a force for keeping the YY 'axis in a straight line by a centripetal force due to rotation, and as a result, a pressing force acts on the side surface of the shell mold 8. Therefore, if there are protrusions such as sand burrs 9 on this surface, the vehicle will run while being scraped off.

In addition, the number of revolutions is set to 1,500 to 2,000 rp in order to make the pressing force of the cutting tool 7 to the shell mold 8 appropriate and prevent the mold from being excessively cut.
Control to keep in the range of m.

In the case of deburring using the mold deburring tool holder A according to the present invention, since the traveling point is stored in advance so as to make a strong hit within the range of 0.5 to 1 mm, if the shell mold 8 has dimensional variations or Set variation or blade 7
If various variations, such as variations due to wear of the surface, are within the range of 0.5 to 1 mm, a good finished surface can be stably secured because the variation can be absorbed. In addition, the accuracy of teaching the trajectory does not need to be accurate, and the teaching speed can be increased.

FIG. 2 shows the positional relationship between the articulated robot B when the deburring is performed by the articulated robot B and the shell core 8 of a shell type. The shell core 8 is set on a dedicated jig 10 so that it can be positioned correctly. or,
The jig 10 and the robot main body 11 are connected by a common base 12, so that the mutual positional relationship is maintained. The teaching of the traveling path to the articulated robot B is performed by using the shell core, which has been cut off the burrs in advance, as a master work, and using the same cutting tool 7 as that used for deburring, the shell core 8 to be deburred. The blade 7 is applied to the surface of the robot and the position is taught as the traveling point of the articulated robot B. In this way, the straight section is taught sequentially by a combination of the start and end sections. When the teaching of all the paths of the shell core 8 by the above method is completed, the articulated robot B is stored in the tape as a one-cycle operation. The operation of the articulated robot B can be reproduced by setting the same tape and calling the program. The same operation can be repeated any number of times, and deburring can be performed stably.

In FIG. 2, 13 is a work table, 14 is an air pressure regulator, 15
Is an airline.

[Effect of the invention]

As described in detail above, the mold deburring tool holder according to the present invention attaches a member to be chucked to a tool chuck via a resilient cushion member to a base end of the tool holder portion, and further includes a tool holder portion. In addition, a flywheel is provided concentrically with the center of rotation, and a cutting tool is mounted at the tip of the tool holder and at a position deviated from the center of rotation. is there.

Therefore, the member to be chucked of the mold deburring tool holder is gripped by, for example, a tool chuck of an articulated robot, and the tool is rotated by rotating the mold deburring tool holder. By pressing the sand burrs, the sand burrs are shaved off.

At this time, when the blade is mounted at a position deviated from the rotation center of the tool holder, the blade is pressed against the surface of the workpiece, and the blade is bent while elastically deforming the elastic cushion member. And the cutting tool rotates while reciprocating along the surface of the workpiece with a stroke corresponding to the eccentric amount, whereby the workpiece surface is shaved off by both the rotating operation and the reciprocating operation of the cutting tool. And the cutting efficiency of burrs can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention, and FIG. 2 is an explanatory view of a deburring operation showing deburring of a mold using a mold deburring tool holder according to the present invention in an articulated robot. 1 is a holder body, 2 is a tool holder part, 3 is a flywheel, 4 is a cushion mounting part, 5 is an elastic cushion member, 6 is a shaft body, 7 is a blade, and 7 'is a blade mounting part.

Claims (1)

(57) [Scope of request for utility model registration] 1. A flywheel which is attached to a base end of a tool holder through a resilient cushion member and is concentric with a center of rotation of the tool holder. And a cutting tool attached to the tip of the tool holder and offset from the center of rotation of the tool holder.