JP4345061B2 - Shot blasting apparatus and method - Google Patents

Description

  The present invention relates to a shot blasting apparatus and method.

  Conventionally, as a shot blasting apparatus that projects a projection material onto a workpiece, for example, a batch-type tumbling blasting apparatus has been publicly known (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 4-109859 (2nd page, Fig. 1)

  However, the apparatus as disclosed in Patent Document 1 has a problem that the certainty of the cleaning is inferior because a plurality of workpieces are tumbled in a batch system. For this reason, since the projection time is lengthened in accordance with a workpiece having a poorly polished finish, there is a problem that the workpiece is cleaned more than necessary, and there is a problem that the finish of the polishing for each workpiece is not uniform. Furthermore, there is a problem that when a plurality of workpieces are tumbled in batch mode, the workpieces are easily damaged.

The present invention has been made in view of the above-mentioned problems, can improve the reliability of workpiece cleaning, can uniform the degree of polishing for each workpiece, and can be applied to workpieces. It is an object of the present invention to provide a shot blasting apparatus and method that can prevent scratches.

In order to achieve the above object, a shot blasting apparatus according to the present invention is a shot blasting apparatus for projecting workpieces one by one, and is formed inside a cabinet and projects a projection material onto the workpiece. A chamber in which the one workpiece is inserted and rotated in the projection chamber, and a projecting means for projecting a projection material onto the workpiece that rotates in the state inserted in the cage in the projection chamber , And the center of the rotation axis for rotating the cage and the center of the cage itself are eccentric .

  In the shot blasting apparatus according to the present invention, the projection unit is mounted on the upper and lower portions of the side wall of the projection chamber, and the projection amount of the lower projection unit is larger than that of the upper projection unit. It is characterized by that.

  Further, in the shot blasting apparatus according to the present invention, the cage includes a plurality of guide members having openings into which the workpieces are inserted, a workpiece mounting member in which a plurality of openings are drilled and the workpieces are mounted, The guide member is arranged in a plurality of stages at intervals in the vertical direction, and the work placing member is arranged below the lowermost guide member at intervals. And

  Furthermore, the shot blasting apparatus according to the present invention is characterized in that each of the plurality of guide members is changeable in height.

  Furthermore, the shot blasting apparatus according to the present invention is characterized in that a large number of openings in the workpiece placing member are in a honeycomb shape.

In order to achieve the above object, the shot blasting method according to the present invention is a shot blasting method in which workpieces are projected one by one, and one workpiece is inserted into a projection chamber formed inside the cabinet. a step of rotating the cages, possess a step of projecting the projection material with projecting means on said workpiece to rotate together with the cage, and is decentered center and the center of the cage itself between rotation shaft for rotating said cage said one of the work in a state wherein the Rukoto to rotate the inserted cage.

  Also, in the shot blasting method according to the present invention, the projection means is mounted on the upper part and the lower part of the side wall of the projection chamber, and the projection amount of the lower part projection means is larger than that of the upper part projection means. Projecting onto the work rotating with the cage.

  In the present invention, the shot blasting device refers to a device that projects a projection material onto a workpiece, and includes a shot peening device and the like.

The present invention is a shot blasting apparatus that projects workpieces one by one, and is formed inside a cabinet, and a projection chamber in which a projection material is projected onto the workpiece, and the one workpiece is inserted. wherein a projection cage made possible rotation in the room, provided with a projection means for projecting the projection material to the workpiece rotates in a state of being inserted into the cage in the projection chamber, rotation axis for rotating the cage with Since the center of the cage and the center of the cage itself are decentered, the reliability of the workpiece cleaning can be improved, and the finish of the polishing for each workpiece can be made uniform, and the workpiece can be scratched. There are various effects such as prevention of sticking.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, a revolving plate 2 is disposed at a lower portion in the box-shaped cabinet 1, and a plurality of partition members 3 and 3 (see FIG. 2) are fixed on the revolving plate 2. . The revolution plate 2 and the partition members 3 and 3 are rotated by a motor 5 around the revolution shaft 4.

  Moreover, the inside of the cabinet 1 by the partition members 3 and 3 is a carry-in chamber 6 for carrying in the workpiece W, and a projection chamber 7 in which a projection material (for example, a steel ball shot) is projected onto the workpiece W, An unloading chamber 8 for unloading the workpiece W is formed (see FIG. 2). In the present embodiment, the workpiece W is a cast product, specifically a caliper of an automobile part.

A cage 9 is provided in each of the carry-in chamber 6, the projection chamber 7, and the carry-out chamber 8, and a rotation shaft 10 is fixed to the lower portion of the cage 9. The rotation shaft 10 is connected to a rotation plate 11 disposed below the revolving plate 2, and the rotation plate 11 is rotated in the projection chamber 7 by a driving means (for example, a motor) not shown. It is like that.

  As shown in FIG. 3, a screw conveyor 12 serving as a first projection material conveying unit that horizontally collects the projection material falling from the projection chamber 7 and conveys the projection material in a horizontal direction is horizontally disposed in the lower portion of the cabinet 1. A bucket elevator 13 is connected to the tip of the screw conveyor 12 as a second projection material conveying means for conveying the projection material conveyed by the screw conveyor 12 upward. The bucket elevator 13 is arranged vertically, and the lower part communicates with the screw conveyor 12. Further, centrifugal projectors 14a and 14b as projection means are mounted on the upper and lower portions of the side wall of the projection chamber 7.

  Further, a screw conveyor 16 as a third projection material conveying means is horizontally arranged and connected to the upper part of the bucket elevator 13 via a chute 15 (see FIG. 1). 18 is installed. A rotary screen (rotary sieve) 19 is disposed in the upper part of the box 18, and the lower part of the box 18 is a wind-selective projection material separator 20 (see FIG. 1). ing. The tip of the screw conveyor 16 extends to the inside of the rotary screen 19.

  A projecting material tank 21 and a foreign matter discharge chute 22 are connected to the lower portion of the box 18, and a large foreign matter (for example, cast burr) discharged from the tip of the rotary screen 19 is connected to the foreign matter discharge chute 22. And is discharged out of the device. Opening and closing gates 23a and 23b for opening and closing the projection material passage are connected to the lower portion of the projection material tank 21. The opening degree of the open / close gates 23a and 23b is adjustable. The open / close gate 23a is connected to the upper centrifugal projector 14a and the open / close gate 23b is connected to the lower centrifugal projector 14b through an introduction pipe (not shown).

  Next, the cage 9 will be described in detail. In FIG. 4, annular guide members 9b and 9b having circular openings 9a into which the workpiece W is inserted are arranged in a plurality of stages (three stages in this embodiment) at intervals in the vertical direction. As shown in FIG. 5 (a), a plurality of mounting holes 9c, 9c are perforated on the periphery of the guide members 9b, 9b at an equal pitch (in this embodiment, four at a 90 degree pitch). The opening 9a is slightly larger than the outer diameter of the workpiece W.

  A work placement member 9d on which the work W is placed is disposed below the lowermost guide member 9b. As shown in FIG. 5 (b), a plurality of mounting holes 9e, 9e are drilled at an equal pitch (four in this embodiment at a pitch of 90 degrees) on the periphery of the workpiece mounting member 9d. The workpiece mounting member 9d is provided with a large number of openings 9f and 9f, and the numerous openings 9f and 9f are formed in a honeycomb shape.

  A cross-shaped rotation shaft fixing member 9g is disposed below the workpiece placement member 9d with a space therebetween. As shown in FIG. 5 (c), a plurality of mounting holes 9h, 9h are perforated at an equal pitch (four at a 90 degree pitch in this embodiment) on the periphery of the rotating shaft fixing member 9g.

  Hollow tubes 9i and 9i are disposed between the mounting holes 9c and 9c, between the mounting hole 9c and the mounting hole 9e, and between the mounting hole 9e and the mounting hole 9h, respectively. The connecting rods 9j and 9j pass through the mounting holes 9c, 9e and 9h and the hollow tubes 9i and 9i, respectively. The connecting rods 9j and 9j are threaded at both ends, and the threaded portions are fastened with nuts 9k and 9k.

  The rotation shaft 10 is fixed to the lower portion of the rotation shaft fixing member 9g in the cage 9 as described above. As shown in FIG. 5D, in the fixing, the center 100 of the rotation shaft 10 for rotating the cage 9 and the center 90 of the cage 9 itself are eccentric.

  The operation of the apparatus configured as described above will be described. First, one work W is inserted into the cage 9 in the carry-in chamber 6. Then, the motor 5 is activated, the revolving plate 2 and the partition members 3 and 3 are rotated 120 degrees around the revolving shaft 4, and the workpiece W inserted in the cage 9 is moved into the projection chamber 7. . Next, in the projection chamber 7, the driving means (not shown) is operated, and the rotation shaft 10 is rotated via the rotation plate 11. Thereby, the cage 9 in the projection chamber 7 rotates eccentrically around the rotation axis 10.

Then, the open / close gates 23a and 23b are opened, and the operation of the centrifugal projectors 14a and 14b causes the projection material to be projected onto the workpiece W that rotates eccentrically around the rotation shaft 10 while being inserted into the cage 9. . At this time, the amount of projection of the lower centrifugal projector 14b is larger than that of the upper centrifugal projector 14a, and the projection is projected onto the work W that rotates together with the cage 9. In this embodiment, the projection amount of the upper centrifugal projector 14a is 230 kg / min, and the projection amount of the lower centrifugal projector 14b is 290 kg / min. The projection material is projected onto the workpiece W for a desired time, and one next workpiece W is inserted into the empty cage 9 in the carry-in chamber 6 during the projection.

  Further, the projection material falling from the projection chamber 7 is collected by the screw conveyor 12 and conveyed to the bucket elevator 13. Then, it is transported upward by the bucket elevator 13 and put into the screw conveyor 16 through a chute 15. The thrown projection material is conveyed by the screw conveyor 16 into the rotating rotary screen 19.

Then, due to the rotation of the rotary screen 19, the projection material falls through the mesh (not shown) of the rotary screen 19 to the projection material separator 20. Large foreign matters such as cast burrs are discharged from the tip of the rotary screen 19 and are discharged out of the apparatus through the foreign matter discharge chute 22. Then, impurities (for example, fine powder and sand) are separated from the projection material by the projection material separator 20, and the projection material from which the impurities are separated falls into the projection material tank 21 and is circulated for use.

  Moreover, after the projection material is projected onto the workpiece W for a desired time, the open / close gates 23a and 23b are closed. Thereafter, the operation of the driving means (not shown) is stopped, and the above-described rotation of the cage 9 and the workpiece W is stopped. Then, the motor 5 is operated, and the revolving plate 2 and the partition members 3 and 3 are rotated 120 degrees around the revolving shaft 4. As a result, the workpiece W subjected to the projection process is moved from the projection chamber 7 into the carry-out chamber 8 while being inserted into the cage 9, and the workpiece W 6 to be projected next is inserted into the cage 9 while being loaded into the cage 9. It is moved from the inside into the projection chamber 7.

Then, the workpiece W moved into the projection chamber 7 is projected by the same operation as described above. During the projection, the workpiece W after the projection processing in the carry-out chamber 8 is carried out from the cage 9 in the carry-out chamber 8, and one next workpiece W is inserted into the empty cage 9 in the carry-in chamber 6. The Then, by repeating the above-described operation, a number of workpieces W are sequentially projected one by one.

  In the present invention, as described above, the projection means, that is, the centrifugal projectors 14a and 14b are mounted on the upper and lower parts of the side wall of the projection chamber 7, and the lower part is higher than the centrifugal projector 14a in the upper part. The amount of projection of the centrifugal projector 14b is increased and projected onto the work W that rotates together with the cage 9. Thereby, the workpiece W is slightly lifted from the upper surface of the workpiece placing member 9d in the cage 9 during the projection, and the projection is performed in a state where a gap is formed between the upper surface of the workpiece placing member 9d and the bottom surface of the workpiece W. It will be. For this reason, it is possible to eliminate an unground portion on the bottom surface of the workpiece W which is difficult to be polished, and the entire workpiece can be reliably polished. In order to increase the projection amount of the lower centrifugal projector 14b from the upper centrifugal projector 14a, the gate opening of the open / close gate 23b may be made larger than the open / close gate 23a.

  In the present invention, as described above, the center 100 of the rotation shaft 10 that rotates the cage 9 and the center 90 of the cage 9 itself are eccentric. This has the following advantages. Some workpieces W have bottomed holes Wa and Wa (see FIG. 4) like the calipers shown in this embodiment. When processing such a workpiece W, if the method of rotating the cage 9 with the center 100 of the rotation shaft 10 and the center 90 of the cage 9 itself being concentric, the projection material is placed in the bottomed holes Wa and Wa. Is retained, and interference between the staying projection material and the projection material projected from the centrifugal projectors 14a and 14b is likely to occur, and the inside of the bottomed holes Wa and Wa cannot be polished well. However, as in the present invention, the cage 9 in which the one workpiece W is inserted is rotated while the center 100 of the rotation shaft 10 that rotates the cage 9 and the center 90 of the cage 9 itself are eccentric. As a result, the centrifugal force applied to the workpiece W increases, and the projection material in the bottomed holes Wa and Wa is well discharged. Therefore, the projection material hardly stays in the bottomed holes Wa and Wa, and interference between the staying projection material and the projection material projected from the centrifugal projectors 14a and 14b hardly occurs. For this reason, it is possible to eliminate the non-polished portions in the bottomed hole portions Wa and Wa that are difficult to be cleaned, and it is possible to surely clean the bottomed hole portions Wa and Wa.

  Furthermore, in the present invention, the height of each of the plurality of guide members 9b, 9b can be changed, so that various workpieces W can be handled. If this point is explained in full detail, the said hollow tubes 9i and 9i are exchangeable by the structure mentioned above. For this reason, even when the height, shape, etc. of the workpiece W are changed due to the change in the type of the workpiece W, the guide member can be obtained by replacing the hollow tubes 9i, 9i with those having different height dimensions. The height of each of 9b and 9b can be freely changed according to the type of workpiece W. Since the hollow tubes 9i and 9i are exchangeable, it goes without saying that the height of the workpiece placing member 9d can be changed.

  Furthermore, in the present invention, as described above, a large number of openings 9f and 9f in the workpiece placing member 9d are formed in a honeycomb shape. The honeycomb has a larger opening area than a large number of circular holes. For this reason, the projection material from the centrifugal projector 14b in the lower part is projected on the bottom surface of the workpiece W without waste and in large numbers. This also works advantageously for lifting of the workpiece W from the upper surface of the workpiece mounting member 9d in the cage 9.

  In the embodiment of the present invention, the centrifugal projectors 14a and 14b are used as the projecting means. However, the present invention is not limited to this. For example, an air nozzle injection type in which a projection material is injected from a nozzle together with compressed air. The projector may be used.

It is a front view which shows embodiment of this invention. It is an AA arrow line view in FIG. It is a BB arrow line view in FIG. It is detail drawing of a cage. (A) is a CC arrow view in FIG. 4, (b) is a DD arrow view in FIG. 4, (c) is an EE arrow view in FIG. 4, (d) is F in FIG. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cabinet 7 Projection chamber 9 Cage 9a Opening 9b Guide member 9d Workpiece mounting member 9f Opening 10 Autorotation shaft 14a Upper part projection means 14b Lower part projection means 90 Center of cage itself 100 Center of rotation axis W Workpiece

Claims (7)

A shot blasting device for projecting workpieces one by one, wherein the projection chamber is formed inside a cabinet and projects a projection material onto the workpiece, and the one workpiece is inserted and the projection chamber is inserted. And a projection means for projecting a projection material onto the workpiece that rotates in a state of being inserted into the cage in the projection chamber, and a center of a rotation axis for rotating the cage, A shot blasting device characterized by decentering the center of the cage itself . 2. The projection means is mounted on an upper part and a lower part of a side wall of the projection chamber, and the projection amount of the lower projection means is larger than that of the upper projection means. The shot blasting device described. The cage includes a plurality of guide members having openings into which the work is inserted, and a work placement member on which the openings are placed and a plurality of openings are placed, and the guide member is vertical. 3. The work mounting member according to claim 1, wherein a plurality of steps are arranged at intervals in the direction, and the work placing member is arranged below the lowermost guide member at intervals. The shot blasting device according to the above. 4. The shot blasting apparatus according to claim 3, wherein each of the plurality of guide members is changeable in height. The plurality of apertures in the workpiece mounting member is, shotblasting device according to claim 3 or 4, characterized in that a honeycomb. A shot blasting method for projecting workpieces one by one, the step of rotating a cage in which one workpiece is inserted in a projection chamber formed inside the cabinet, and the workpiece rotating together with the cage a step of projecting the projection material by the projection means, the possess, the one workpiece Ru is rotating the inserted cage in a state where the center and is decentered the center of the cage itself between rotation shaft for rotating said cage A shot blasting method characterized by that. The projection means is mounted on the upper part and the lower part of the side wall of the projection chamber, and the projection amount of the lower part of the projection means is larger than the projection means of the upper part and projected onto the work rotating with the cage. The shot blasting method according to claim 6, wherein: