JPH0538670A - Vortex flow barrel processing machine - Google Patents

Abstract

PURPOSE:To solve the problem about thermal expansion of a lining, prolong the cycle time of re-lining, and simplify the repair works. CONSTITUTION:At the peripheral edge of the oversurface of a rotary trough 13, a detaining groove 23 is provided over the circumference with the opening facing the oversurface in the rotational axis direction, and therein a plurality of segments 21a made of shape memory alloy are loosely fitted at a constant spacing with possibility of removing. When the temp. rises due to polishing process, the lining 19 of this rotary trough 13 is going to expand outward in the radial direction of the trough 13 so as to push and bend the segments 21a outward in the radial direction. Even though the segments 21a have curved as out of limit for resisting this power, returning to the stored shape takes place when a further rise of temp. causes exceeding the transfer point, so that the lining 19 is intruded inward in the radial direction and hindered from expansion to the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swirl barrel processing machine in which a lining made of an elastic material is attached to the inner surface of a barrel tank consisting of a fixed tank and a rotary tank, and more particularly, a lining on the fixed tank side and a lining on the rotary tank side. The present invention relates to a vortex flow barrel machine in which a minute gap is formed between

[0002]

2. Description of the Related Art In swirl barrel machining, an abrasive material and a workpiece (a mixture of these materials is hereinafter referred to as a mass) are spirally fluidized in a barrel tank so that the workpiece is polished, so that it occurs during polishing. Friction heat causes the mass to become hot (sometimes up to about 100 ° C).
Therefore, the lining of the barrel tank thermally expands, and as a result of the thermal expansion on the rotary tank side, the diameter of the lining increases.
Such an increase in diameter is not only caused by thermal expansion, but is also brought about by the weight of the mass or the centrifugal force of the rotary tank, but with the increase in the diameter of the lining, the minute gap between the fixed tank and it becomes even narrower. Therefore, a problem of seizure with the lining on the fixed tank side occurs. The gap between the fixed tank and the rotary tank must be set to a very small value in order to prevent galling due to the invasion of abrasives, etc. I can't do anything.

Therefore, as a conventional measure to prevent the expansion of the lining diameter on the rotary tank side, for example, the actual development No. 4
Some of these are disclosed in 8-74392 or Japanese Utility Model Laid-Open No. 62-29248. These essential parts are shown in FIGS.

In the structure shown in FIG. 5, a stopper edge 51 is made to project integrally with the base portion (made of iron) and along the entire circumference at a position slightly inside from the outer peripheral edge of the rotary tank 50, whereby the outer peripheral direction of the lining 52 is extended. It serves as a weir against thermal expansion. On the other hand, in the case of FIG. 6, the stopper edge 51 is integrally raised from the outer peripheral edge of the rotary tank 50 so as to directly face the lining 54 on the fixed tank 53 side. Is effectively regulated.

[0005]

By the way, during polishing, even the lining of the barrel tank is gradually subjected to the polishing action. Therefore, as the wear progresses with time, the head of the stopper edge 51 is finally exposed. In reality, even in such a situation, it is often not noticeable, and it is not uncommon to scrape off the stopper edge 51 for a considerable length. Once the stopper edge 51 is worn, the function as a weir against the expansion deformation is impaired. However, since the stopper edge 51 is formed integrally with the base 50a, the revolving tank 50 should be re-lined.
It becomes necessary to replace everything from the base 50a. Therefore, the repair work requires a considerable amount of time and is expensive. Moreover, in the conventional case, the usable period of the lining 52 is slightly in the depth range from the surface to the head of the stopper edge 51 (the range indicated by S in the figure) as shown in FIG. The cycle time to lining is short. In addition, considering that the wear of the stopper edge 51 requires immediate replacement of the entire rotary tank, the wear condition must be monitored strictly from the usual circumstances, which is troublesome in terms of inspection.

[0006] Therefore, the applicant of the present invention applied for registration of a utility model as to a device in which the stopper portion was detachably fixed to the rotary tank and the stopper portion could be replaced when it was worn (Practical application No. 2-37628). No.).

However, in the swirl barrel processing machine disclosed in the same application, a stopper divided for the entire circumference is used in order to facilitate the replacement work, and it is formed integrally with the rotary tank. The force to hold the thermal expansion of the lining was weaker than that of the stopper. Therefore, over a long period of time, the lining undergoes thermal expansion and gradually expands, and in the worst case, the linings of the fixed tank and the rotary tank come into contact with each other.

The present invention was devised in order to solve the above-mentioned problems, and after solving the problem of thermal expansion of the lining, prolonging the relining cycle time, simplifying the repair work, etc. An object is to provide a swirl barrel processing machine that can be realized.

[0009]

In order to achieve the above object, the invention according to claim 1 is such that a fixed tank having a cylindrical recess has a circular outer periphery and is rotated by a rotating mechanism. And a thick lining made of an elastic material is attached to the inner surface of the fixed tank and the inner surface of the fixed tank in the rotary tank, and the lining and the rotation attached to the fixed tank side. In a swirl barrel processing machine equipped with a barrel tank in which a minute distance is formed between the tank and a lining provided on the side of the tank, in the outer peripheral portion of the surface provided with the lining in the rotary tank, The stopper is formed so as to be detachable upright in the axial direction of the rotary tank, and the stopper is formed of a member having a predetermined shape when the temperature rises.

The invention according to claim 2 provides the invention according to claim 1.
In the eddy current barrel processing machine described in (1), the stopper is
It is made of a shape memory alloy.

Furthermore, the invention according to claim 3 is the swirl barrel processing machine according to claim 1, wherein the stopper is formed of a member having a property of bending in a predetermined direction when the temperature rises, and It is arranged in the rotary tank such that the bending direction is toward the rotation axis side of the rotary tank.

According to a fourth aspect of the present invention, in the vortex barrel processing machine according to the third aspect, the stopper is formed of bimetal.

[0013]

In the invention according to claim 1 configured as described above, when the temperature of the mass rises during polishing, the lining attached to the rotary tank tends to expand in the radial direction by thermal expansion. Since the stopper is provided upright in the peripheral portion in the axial direction, the expansion of the lining is prevented.

On the other hand, even if the wear of the lining progresses and the stopper is also scraped, if the lining is removed from the rotary tank, the worn stopper is removed from the rotary tank, a new stopper is replaced, and re-lining is performed, the original It is restored to the state of.

Further, the lining tries to push the stopper slightly outward in the radial direction when it is about to thermally expand, but the stopper has a property of returning to a predetermined shape before being pushed and bent when the temperature rises. Therefore, even if it is pressed outward in the radial direction, it can be returned to the axial direction side.

Here, in the invention according to claim 2 configured as described above, the stopper is made of a shape memory alloy, and the stopper is provided so that the lining of the rotary tank does not come into contact with the lining of the fixed tank. If the predetermined shape is memorized, even if the temperature rises due to polishing and the lining bends the stopper radially outward, if the temperature exceeds the transformation point, the stopper will return to the shape before being pushed and bent by the lining. Regulate lining expansion.

On the other hand, in the invention according to claim 3 configured as described above, when the temperature rises, the stopper tends to bend toward the rotation axis side, so that the lining heats up as the temperature rises. It tries to hold down the lining toward the axis of rotation against the expansion.
Therefore, the two are balanced and expansion of the lining due to thermal expansion is restricted. For example, since there is a temperature difference of about 20 ° C. between winter and summer, when a vortex barrel processing machine is manufactured in winter, the lining of the rotary tank thermally expands even in normal temperature in summer. Even with such thermal expansion, the lining tries to push the stopper outward in the radial direction, but due to the temperature rise during polishing, the lining tends to bend toward the rotational axis side, and thus tries to return to the original position.

In the invention according to claim 4 configured as described above, the stopper is made of bimetal, and when the temperature rises, the stopper tends to warp in one direction, so this direction is set to the rotation axis side. If it is disposed facing, expansion of the lining due to thermal expansion is restricted.

[0019]

As described above, according to the present invention, since the stopper for restricting the thermal expansion of the lining is removable, it is possible to allow the wear to some extent, prolong the cycle time of the relining and perform the repair work. It is possible to provide a swirl barrel processing machine capable of simplifying the above, and making it possible to reliably prevent the lining from expanding by making the deformation of the stopper itself self-repairing.

[0020]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a schematic structure of a vortex barrel processing machine. In FIG. 1, reference numeral 1 is a base, 2 is an upright portion on the right side of the base 1 in the figure, and a bucket is raised and lowered for supplying a mass to a barrel tank 3. It is a device. This bucket lifting device 2
The bucket 4 is attached to a chain 5 wound around a plurality of sprockets in a tensioned state, and is lifted and lowered by a bucket driving motor 6 between a standby position and a loading position described below. The standby position is the selection conveyor 7 described later.
Is set immediately below the tip of the conveyor, and here, the abrasive dropped from the sorting conveyor 7 and the unprocessed workpiece poured by the operator's hand are received. On the other hand, the charging position is set at a position diagonally above the barrel tank 3, and the bucket lifting device 2 can tilt the bucket 4 at this position by a predetermined angle to charge the mass into the barrel tank 3.

On the other hand, a support frame 8 is erected on the side of the bucket lifting device 2 on the base 1. Barrel tank 3
The support shaft 9 is supported by a bearing fixed on the support frame 8.
It is rotatably supported about. In addition, the spindle 9 is connected to the barrel tank reversing motor 11 via the chain 12.
It is connected with. The reversing motor 11 is of a type that can rotate in both forward and reverse directions.
Can be rotated in two directions. That is, when the mass is received from the bucket 4 at the loading position, the barrel tank 3 can be tilted clockwise in FIG. 1, and when the mass is dropped onto the sorting conveyor 7, it can be inverted approximately 180 ° counterclockwise. it can.

However, the operation of the reversing motor 11, the bucket driving motor 6 or the barrel tank driving motor 14 for driving the barrel tank 3 described above, and the operation of the vibration motor in the sorting conveyor 7 described below are based on 1 is sequence-controlled by a sequencer in a control panel (not shown).

A guide chute 15 is provided for guiding the spilled mass to the sorting conveyor 7 while the barrel tank 3 is being inverted.
And both sides are formed in a gutter shape with an arc shape.

The sorting conveyor 7 is arranged almost directly below the barrel tank 3 and is installed so that its base end is continuous with the guide chute 15. A wire mesh 16 for sieving the workpiece and the abrasive material is stretched over the conveyor 7 over the entire length. The wire mesh 16 itself serves as a workpiece conveying path, and the lower side of the wire mesh 16 penetrates the wire mesh 16. It serves as a conveyance path for the polished abrasive. Further, a vibration motor 24 is attached to the side portion of the sorting conveyor 7, so that the workpiece or the abrasive material on both conveying paths can be conveyed by vibration. Further, a take-out chute (not shown) is connected to the tip of the transport path for the workpiece, while the transport path for the abrasive is located above the standby position of the bucket 4 as described above, and the abrasive is transferred to the bucket 4. I am able to reduce it. The barrel tank 3 is composed of a cylindrical fixed tank 17 that opens upward, and a rotary tank 13 that is concentrically installed inside and is driven by a barrel tank drive motor 14.

FIG. 2 shows a cross section of the barrel tank 3 close to the wall surface. The fixed tank 17 (made of iron) is a dish-shaped bottom wall 17a.
And a cylindrical side wall 17b form a schematic structure. A flange 17c formed on the lower opening edge of the side wall 17b is placed on the opening edge of the bottom wall 17a and is bolted to be fixed to the bottom wall 17a. Further, on the inner peripheral surface of the side wall 17b, a thick lining 18 made of urethane resin (other elastic material, for example, rubber lining may be used) is provided with the same surface as a base. A sloping surface 18a having a downward slope is formed at the bottom of the lining 18, and the sloping surface 18a is cut off substantially vertically from the bottom surface to a facing surface 18b facing the lining 19 on the rotary tank 13 side.

The rotary tank 13 is arranged concentrically with the lower opening edge of the side wall 17b of the fixed tank 17, and the bottom wall 1 of the fixed tank 17 is provided.
A space 20 for drainage is held between it and 7a. Similarly to the fixed tank 17, the rotary tank 13 is also provided with a thick lining 19 of urethane resin on the entire upper surface of the base 13a made of iron. The outer peripheral edge is formed thicker than the other portions, and the upper surface has an inclined surface 19 continuous with the inclined surface 18a of the lining 18 on the fixed tank 17 side.
a is formed, and the outer peripheral surface is vertically cut off to form a standing surface 19b, and the facing surface 18 on the fixed tank 17 side is formed.
b and a small gap (about 0.3 to 1 mm) are held all around and face each other.

A mounting edge 22 having a predetermined width is formed on the outer peripheral edge of the base 13a in the rotary tank 13, and an engaging groove 23 for mounting the stopper 21 is formed on the upper surface of the mounting edge 22. It is recessed over the entire circumference toward the upper surface side in the direction of the rotation axis. The stopper 21 is composed of a plurality of segments 21 formed of a shape memory alloy in the shape shown in FIG.
10a to 30 segments 21a at substantially equal intervals are removably loosely fitted over the entire circumference of the locking groove 23. At this time, a slight gap is left between each segment 21a in consideration of thermal expansion.

The transformation point of the shape memory alloy forming the segment 21a is set to 35 ° C. to 40 ° C.
At, the shape extended in a straight line parallel to the axial direction of the rotary tank 13 is stored as indicated by the chain double-dashed line. The material is Ti-Ni alloy, Cu-Zn-Al alloy, Cu-A.
Known materials such as 1-Ni alloy and Fe-Mn-Si alloy can be used.

Each segment 21a is embedded to a predetermined depth by the lining process.
The height protruding from the locking groove 23 is set so that the expansion deformation of the lining 19 can be effectively restricted.

The processing machine of this example is constructed as described above, and its operation will be described below.

First, at the standby position, an unmachined workpiece is put into the bucket 4 containing the abrasive. Next, the bucket lifting device 2 is driven by the bucket driving motor 6.
Is driven, and the bucket 4 rises to the loading position. The bucket 4 inclines here as shown in FIG. 1, but at this time, the barrel tank 3 also inclines toward the bucket 4 side by the driving of the barrel tank reversing motor 11, whereby the mass is transferred into the bucket 4. Be done. After the barrel tank 3 returns to the original position, the barrel tank drive motor 14 rotates the rotary tank 13 to polish the workpiece.

Due to the polishing process, the temperature in the barrel tank 3 rises and the lining 19 of the rotary tank 13 tries to thermally expand. The lining 19 expands in the thickness direction and expands radially outward of the rotary tank 13 by thermal expansion, but a segment 21a as a stopper 21 is fixed along the locking groove 23 at the outer peripheral edge portion of the rotary tank 13. The outer peripheral edge of the lining 19 is the segment 21
Attempt to push a toward the outside.

If the segment 21a cannot withstand this force and bends as shown in FIG. 4, the distance between the lining 19 of the rotary tank 13 and the lining 18 of the fixed tank 17 decreases, but the temperature is further increased. Rises above the transformation point, the segment 21a returns to the memorized shape as shown by the chain double-dashed line in FIG. Therefore, the lining 19 is pushed inward in the radial direction and is prevented from expanding outward.

Further, since the temperature difference between winter and summer is about 20 ° C., if the size of the lining 19 in winter is taken as a standard, the temperature difference between the lining 19 and the lining 19 is not started in summer. Will cause thermal expansion. Due to such thermal expansion, the segment 21a tends to be pushed outward in the radial direction other than during the polishing process, and therefore may be gradually curved outward unless it is corrected in the axial direction.

However, as described above, when the temperature exceeds the transformation point, the segment 21a returns to its original shape on the axial center side, so that the interval between the lining 18 and the lining 19 should be increased in consideration of the strict temperature difference. You don't have to.

In this embodiment, the segment 21
Although a is formed of a shape memory alloy, it may be formed of bimetal. In this case, the bimetal is oriented so that it bends toward the axial center side as the temperature rises, forming the segment 21a.

With this structure, the temperature of the lining 19 increases due to polishing, and the segments 21a tend to bend toward the axial center when the lining 19 is about to thermally expand. To prevent it from expanding.

Further, since the bimetal gradually deforms according to the temperature, a force that deforms due to a change in the temperature during normal times is also generated. Therefore, even if the temperature changes in the winter and summer, the expansion of the lining 19 can be prevented before the polishing process and the contact with the lining 18 can be prevented.

By the way, the liquid mixture such as fine-grained abrasive and water generated during this processing is used in the rotary tank 13 and the fixed tank 17.
Leaks from the minute gap between and to the drainage space 20 between the bottom wall 17a of the fixed tank 17 and is stored, and is drained to the outside of the tank after polishing is completed.

When the processing is completed, the barrel tank drive motor 1
Subsequent to the stop of 4, the barrel tank reversing motor 11 reverses the barrel tank 3 counterclockwise by about 180 °. As a result, the mass in the barrel tank 3 is discharged and falls on the wire net 16 of the sorting conveyor 7. Further, a part of the mass spilled from the barrel tank 3 during the reversal of the barrel tank 3 falls along the guide chute 15 and is guided onto the sorting conveyor 7.

In the sorting conveyor 7, the work and the abrasive are sorted by the wire net 16 and transferred by the vibration of the vibration motor 24. Then, the workpiece is taken out from a take-out chute (not shown), and the abrasive is dropped from the tip of the conveyor 7 to the bucket 4 waiting at the waiting position to prepare for another working operation. By the way, when the linings 18 and 19 of the rotary tank 13 and the fixed tank 17 have been abraded over time, the relining work of these is performed at an appropriate time. In this case, even if the lining 19 on the rotary tank 13 side is worn by the time the stopper 21 is exposed, the lining 19 is removed by means such as baking, and the stoppers 21 are removed from the locking grooves 23 to remove the rotary tank. It can be separated from the base 13a of 13. Therefore,
If the stopper 21 is replaced with a new one and relining is performed, it can be immediately restored. That is, unlike the conventional case, even if the stopper 21 is worn inadvertently, only the stopper 21 needs to be replaced without replacing the entire rotary tank 13, so that the relining work can be performed easily and inexpensively. ..

Further, in the prior art, re-lining is required before the stopper 21 is exposed, that is, the range in which wear is tolerable is small and the progress thereof must be strictly checked. In this case, the allowable wear range of the lining 19 is the range from the surface of the lining 19 including the stopper 21 to the upper surface of the mounting edge 22 (W dimension shown in FIG. 2). That is, since the allowable range of wear is expanded as compared with the conventional case, the cycle time for relining the lining 19 is extended, and therefore it is not necessary to inspect wear very strictly.

The stopper may not necessarily be made of metal as long as it effectively restricts the expansion deformation of the lining, and shape memory resin or the like can be used.

[Brief description of drawings]

FIG. 1 is an overall view of a vortex barrel processing machine according to an embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of a barrel tank.

FIG. 3 is an enlarged perspective view of a segment forming a stopper.

FIG. 4 is a partially enlarged sectional view of a barrel tank.

FIG. 5 is a partially enlarged sectional view of a conventional barrel tank.

FIG. 6 is a partially enlarged sectional view of another conventional barrel tank.

[Explanation of symbols]

 3 ... Barrel tank 13 ... Rotating tank 13a ... Rotating tank substrate 17 ... Fixed tank 18, 19 ... Lining 21 ... Stopper 21a ... Segment

Claims (4)

[Claims] 1. A rotary tank having a circular outer periphery formed at the bottom of a fixed tank having a cylindrical recess and rotated by a rotating mechanism, and an inner surface of the fixed tank and the fixed tank in the rotary tank. A thick lining made of elastic material is attached to the inner surface, and a minute gap is formed between the lining attached to the fixed tank side and the lining attached to the rotary tank side. In a swirl barrel processing machine equipped with a barrel tank, the stopper that becomes a predetermined shape when the temperature rises is formed in the axial direction of the rotary tank at the outer peripheral edge part of the surface provided with the lining in the rotary tank. A swirl barrel processing machine characterized by being set up so that it can be detached. 2. The eddy current barrel processing machine according to claim 1, wherein the stopper is formed of a shape memory alloy. 3. The swirl barrel processing machine according to claim 1, wherein the stopper is formed of a member having a property of bending in a predetermined direction when the temperature rises,
An eddy current barrel processing machine, wherein the curving direction is arranged in the rotary tank so that the curving direction is toward the rotation axis side of the rotary tank. 4. The swirl barrel processing machine according to claim 3, wherein the stopper is made of bimetal.