GB2030489A

GB2030489A - Vibratory finishing

Info

Publication number: GB2030489A
Application number: GB7838890A
Authority: GB
Original assignee: Individual
Current assignee: Individual
Priority date: 1978-10-02
Filing date: 1978-10-02
Publication date: 1980-04-10
Also published as: GB2030489B

Abstract

A vibration barrel grinding device particularly for light articles wherein the outer peripheral wall of a vibration barrel having a circular or polygonal grinding tub or a doughnut-shaped tub is formed of a pressured flow wall 1d and a pressured riser wall 1b, a cylindrical core 6 is provided as fixed or rotatably along the inner peripheral wall of the barrel and at least one blade 7 is provided inclined downward on the peripheral surface of the cylindrical core so that the flow of a mass may be forcibly moved downward to improve the grinding efficiency. <IMAGE>

Description

SPECIFICATION Vibration barrel grinding device The present invention relates to vibration barrel grinding devices and more particularly to a vibration barrel grinding device adapted to grind light articles.

In a conventional doughnut-shaped vibration bar rel grinding device, as shown in Figure la a mass contained in a doughnut-shaped barrel tub 1 resonates with a forcible rotary vibration given to the arcuate bottom wall la of the barrel tub 1 so as to be forcibly made to rise as indicated by the arrow a toward the outer peripheral wall 1b from the arcuate bottom wall 1 a and the thus elevated mass flows as indicated by the arrow bin the drawing toward the inner peripheral wall 1 c of the barrel tube 1 and rotates while flowing to the arcuate bottom wall 1 a of the barrel tube 1.

Such rotary motion of the mass in the barrel tub is given by rotating an upper weight 3a and bottom weight 3b fitted to both ends of a motor 2 so as strongly to vibrate the barrel tub 1 mounted on springs Son a mount 4. Therefore, the strong vibration given to the barrel tub 1 will be transmitted to the mass within the barrel tub and will forcibly rotate the mass so as to generate a mutual motion having a mutual contact pressure between a grinding material and a work in the mass to grind the work. If the respective weights 3a and 3b fixed to the shaft of the motor 2 are made to have any advance angle, the mass will rotate and flow in the direction indicated by the arrow c in the barrel tub while spirally rotating as indicated by the solid line arrow in Figure 2 so as to grind the work.However, there have been defects that, in case the work to be ground is a comparatively light article, is forcibly made to rise as indicated by the arrow a toward the outer peripheral wall lb of the barrel tube 1 and flows toward the inner peripheral wall 1c, it will float up out of the grinding material, will not submerge into the grinding material, therefore will not be ground and will reduce the grinding efficiency.

In accordance with the present invention there is provided a vibration barrel grinding device wherein a pressured flow wall and a pressured riser wall are formed on the outer peripheral wall of a substantially circular vibration barrel grinding tub.

One embodiment of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:- Figure 1 is a vertically sectioned elevation of a conventional vibration barrel grinding device.

Figure 2 is a plan view of Figure 1.

Figure 3 is a partly sectioned elevation showing an embodiment of a vibration barrel grinding device of the present invention.

Figure 4 is a plan view of Figure 3.

Figure 3 is a partly sectioned elevation showing an embodiment of a grinding device of the present invention. Figure 2 is a plan view of the same. The same reference numerals are attached to the same parts as in Figure 1 and 2. In the drawings, the outer peripheral wall of a barrel tub has a pressured flow wall ldextending upward inside and a substantially vertically extending pressured riser wall, d indicates a pressured direction of a grinding flow and e indicates a flowing direction of the grinding by the pressure.Due to the forcible motion, the flow will work in the direction indicated by the arrow a from the arcuate bottom wall 1a in the tub and will rise in the direction of 1 b. At this time, by the formation of the pressured flow wall 1 the grinding flow will be pressured in the direction indicated by the arrow d, a strong friction flow will be produced by this pressuring action and a strong grinding will be obtained.As different from the flow in Figure 1 of the conventional method, as shown in Figure 3 of the present invention, the flow will rise to a high position on the upper surface of the tub and will then rotate and flow to a high position of 1 c, therefore naturally the grinding will be effective, the working will be efficient and a strong grinding so far impossible will be possible. 6 is a cylindrical core rotatably provided along the inner peripheral wall 1c in the conventional barrel grindng device. A proper number of blades 7 are fitted as inclined downward to the peripheral surface of this cylindrical core. The direction of the inclination is the rotating and flowing direction (indicated by the arrow c in Figure 2) of the mass. By the way, the cylindrical core 6 may be rotated by a motor 2 provided in the center space of the barrel tub 1 or by any different method.

In such formation, if the mass is rotating and flowing in the direction indicated by the arrow c in the barrel tub 1 while spirally rotating as indicated by the solid line arrow as shown in Figure 4, the cylindrical core b will be rotated in the reverse direction or the same direction as required. Then, due to the inclined surfaces of the blades 7 of this cylindrical core 6, a pressure will act in the direction of pushing in the grinding material and the work to be ground and therefore the work which has floated up will again submerge into the grinding material due to the blades 7, will be forcibly made to rise toward the outer peripherall wall 1b from the arcuate bottom wall 1 a so as to be ground. By the way, it is needless to say that the contour and inclination angle of the blade 7 can be freely selected in response to the object.Further, it is not particularly necessary to rotate the cylindrical core. It is needless to say that, even if the core is stationary, the mass will move along the inclined surfaces of the blades 7 and therefore the work to be ground will submerge into the mass.

As explained above, according to the device of the present invention, as the downward forcible movement on the inner peripheral wall is further added to the spirally rotating flow by the vibrating barrel, the agitating friction flow of the work to be ground and grinding material will become high, the grinding efficiency will be very high and particularly, in case the work is light, the effect will be high.

1. A vibration barrel grinding device wherein a pressured flow wall and a pressured riser wall are formed on the outer peripheral wall of a substantially circular vibration barrel grinding tub.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Vibration barrel grinding device The present invention relates to vibration barrel grinding devices and more particularly to a vibration barrel grinding device adapted to grind light articles. In a conventional doughnut-shaped vibration bar rel grinding device, as shown in Figure la a mass contained in a doughnut-shaped barrel tub 1 resonates with a forcible rotary vibration given to the arcuate bottom wall la of the barrel tub 1 so as to be forcibly made to rise as indicated by the arrow a toward the outer peripheral wall 1b from the arcuate bottom wall 1 a and the thus elevated mass flows as indicated by the arrow bin the drawing toward the inner peripheral wall 1 c of the barrel tube 1 and rotates while flowing to the arcuate bottom wall 1 a of the barrel tube 1. Such rotary motion of the mass in the barrel tub is given by rotating an upper weight 3a and bottom weight 3b fitted to both ends of a motor 2 so as strongly to vibrate the barrel tub 1 mounted on springs Son a mount 4. Therefore, the strong vibration given to the barrel tub 1 will be transmitted to the mass within the barrel tub and will forcibly rotate the mass so as to generate a mutual motion having a mutual contact pressure between a grinding material and a work in the mass to grind the work. If the respective weights 3a and 3b fixed to the shaft of the motor 2 are made to have any advance angle, the mass will rotate and flow in the direction indicated by the arrow c in the barrel tub while spirally rotating as indicated by the solid line arrow in Figure 2 so as to grind the work.However, there have been defects that, in case the work to be ground is a comparatively light article, is forcibly made to rise as indicated by the arrow a toward the outer peripheral wall lb of the barrel tube 1 and flows toward the inner peripheral wall 1c, it will float up out of the grinding material, will not submerge into the grinding material, therefore will not be ground and will reduce the grinding efficiency. In accordance with the present invention there is provided a vibration barrel grinding device wherein a pressured flow wall and a pressured riser wall are formed on the outer peripheral wall of a substantially circular vibration barrel grinding tub. One embodiment of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:- Figure 1 is a vertically sectioned elevation of a conventional vibration barrel grinding device. Figure 2 is a plan view of Figure 1. Figure 3 is a partly sectioned elevation showing an embodiment of a vibration barrel grinding device of the present invention. Figure 4 is a plan view of Figure 3. Figure 3 is a partly sectioned elevation showing an embodiment of a grinding device of the present invention. Figure 2 is a plan view of the same. The same reference numerals are attached to the same parts as in Figure 1 and 2. In the drawings, the outer peripheral wall of a barrel tub has a pressured flow wall ldextending upward inside and a substantially vertically extending pressured riser wall, d indicates a pressured direction of a grinding flow and e indicates a flowing direction of the grinding by the pressure.Due to the forcible motion, the flow will work in the direction indicated by the arrow a from the arcuate bottom wall 1a in the tub and will rise in the direction of 1 b. At this time, by the formation of the pressured flow wall 1 the grinding flow will be pressured in the direction indicated by the arrow d, a strong friction flow will be produced by this pressuring action and a strong grinding will be obtained.As different from the flow in Figure 1 of the conventional method, as shown in Figure 3 of the present invention, the flow will rise to a high position on the upper surface of the tub and will then rotate and flow to a high position of 1 c, therefore naturally the grinding will be effective, the working will be efficient and a strong grinding so far impossible will be possible. 6 is a cylindrical core rotatably provided along the inner peripheral wall 1c in the conventional barrel grindng device. A proper number of blades 7 are fitted as inclined downward to the peripheral surface of this cylindrical core. The direction of the inclination is the rotating and flowing direction (indicated by the arrow c in Figure 2) of the mass. By the way, the cylindrical core 6 may be rotated by a motor 2 provided in the center space of the barrel tub 1 or by any different method. In such formation, if the mass is rotating and flowing in the direction indicated by the arrow c in the barrel tub 1 while spirally rotating as indicated by the solid line arrow as shown in Figure 4, the cylindrical core b will be rotated in the reverse direction or the same direction as required. Then, due to the inclined surfaces of the blades 7 of this cylindrical core 6, a pressure will act in the direction of pushing in the grinding material and the work to be ground and therefore the work which has floated up will again submerge into the grinding material due to the blades 7, will be forcibly made to rise toward the outer peripherall wall 1b from the arcuate bottom wall 1 a so as to be ground. By the way, it is needless to say that the contour and inclination angle of the blade 7 can be freely selected in response to the object.Further, it is not particularly necessary to rotate the cylindrical core. It is needless to say that, even if the core is stationary, the mass will move along the inclined surfaces of the blades 7 and therefore the work to be ground will submerge into the mass. As explained above, according to the device of the present invention, as the downward forcible movement on the inner peripheral wall is further added to the spirally rotating flow by the vibrating barrel, the agitating friction flow of the work to be ground and grinding material will become high, the grinding efficiency will be very high and particularly, in case the work is light, the effect will be high. CLAIMS

2. A vibration barrel grinding device as claimed in claim 1 wherein a cylindrical core is additionally provided on the inner peripheral wall substantially in the center of the vibration barrel grinding tub and at least one blade is provided as inclinded downward on the peripheral surface of said cylindrical core so as to move the flow of a mass forcibly downwards.

3. A vibration barrel grinding device as claimed in claim 2 wherein said cylindrical core is made rotatable.

4. A vibration barrel grinding device wherein the outer peripheral wall of a doughnut-shaped vibration barrel grinding tube is formed of a pressured flow wall and a pressured riser wall, a cylindrical core is provided on the inner peripheral wall of said grinding tub and at least one blade is provided as inclined downward on the peripheral surface of said cylindrical core.

5. A vibration barrel grinding device substantially as hereinbefore described with reference to and as illustrated in Figures 3 and 4 of the accompanying drawings.