JP2008200762A - Method and apparatus for shot blasting workpiece having groove - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for shot-blasting a workpiece, such as a cast product having grooves, which method can improve the quality of the product by efficiently removing foreign substances, such as burrs formed inside the grooves of the workpice, by the shot blasting. <P>SOLUTION: The method for shot-blasting the workpiece having the grooves includes a step of removing large burrs formed on the outside of the workpiece by casting projectiles toward the workpiece while turning the workpiece, and a step of removing inside foreign substances formed inside the grooves of the workpiece by jetting the shots toward the workpiece while making compressed air blow into the grooves of the workpiece. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method and apparatus for shot blasting a product to be processed having a groove. More specifically, the present invention relates to a product to improve the quality of a product having a groove part, for example, a foreign matter such as a burr formed inside a groove of a cast product after casting is efficiently removed by shot blasting. The present invention relates to a shot blasting method and apparatus for processed products.

  Conventionally, shot processing has been performed to project a projection material onto a compression coil spring as a product to be processed to remove foreign matter adhering to the product to be processed, or to apply compressive residual stress (Patent Document 1). reference).

JP 7-251375 A

  However, when shot blasting is performed on a cast metal product having a groove, the projection material tends to accumulate in the groove at a portion where the opening is narrow and the depth is deep like the groove. For this reason, the accumulated projection material hinders the processing, and it becomes difficult for the projected projection material to enter deeply, and foreign matters such as burrs cannot be efficiently removed.

  Therefore, in view of the above circumstances, the present invention efficiently removes foreign matters such as burrs formed in the groove of a product to be processed such as a cast product having a groove by shot blasting, and improves the quality of the product. An object of the present invention is to provide a shot blasting method and apparatus for a product to be processed.

The shot blasting method of the present invention is a shot blasting method for a product to be processed having a groove, and in order to remove a large burr formed on the outside of the product to be processed, the product to be processed is rotated to rotate the product to be processed. The external deburring process that projects onto the inner surface of the product to be processed and the inner part that projects the projection material onto the product to be processed while being blown into the groove of the product to be processed with compressed air in order to remove foreign matter formed inside the groove of the product to be processed And a deburring process.
Moreover, it is preferable that the internal burr removal process uses an air nozzle that simultaneously ejects compressed air and a projection material.
In the internal burr removal step, it is preferable that the product to be processed stops at a position where the projection material faces the groove.

  Further, the shot blasting apparatus of the present invention is a shot blasting apparatus for a product to be processed having a groove portion, and includes a projection chamber body for projecting a projection material onto the product to be processed, a radiation chamber disposed on the inside of the projection chamber body by a liner. A rotating booth that has processing booths of a desorption zone, an external deburring zone, and an internal deburring zone that are divided into three, and that rotates around the intersection of radiation, and a product to be processed that is placed in each processing booth of the rotating booth A rotating cage with a mechanism that holds the workpiece and rotates around the product to be processed, and centrifugal projection that projects the projection material to the product to be processed installed in the processing booth located outside the projection chamber body and located in the external deburring zone An apparatus, an air nozzle for injecting a projection material using compressed air to a product to be processed located in a processing booth located in an internal deburring zone, and a compressed air supply device A pressure tank connected by piping to store the projection material while pressurizing, a mixing valve for mixing the projection material stored in the pressure tank and compressed air, and a piping connecting the pressure tank and the mixing valve. Connecting the injection amount adjusting valve, the transport hose connecting the mixing valve and the air nozzle, the storage hopper for storing the projection material supplied to the centrifugal projection device and the pressurized tank, and the centrifugal projection device, the pressurized tank and the storage hopper A connection pipe, a projection amount adjustment gate that adjusts the amount of projection material that is arranged in each connection pipe and is supplied from the storage hopper to the centrifugal projection device and the pressurized tank, and a projection material that is projected and collected at the bottom of the projection chamber body It is characterized by comprising a projection material circulating device for transporting the liquid to the storage hopper again.

  According to the present invention, large burrs formed on the outside of the product to be processed can be removed by projecting the projection material onto the product to be processed by the centrifugal projection device, and blown into the groove of the product to be processed with compressed air. By processing while discharging the projection material collected inside the groove portion, foreign matters such as small burrs formed inside the groove portion of the product to be processed can be removed without being blocked by the collected projection material. .

Further, in the internal burr removal step, the configuration of the apparatus can be simplified by using the injection of the air nozzle and simultaneously injecting the projection material together with the compressed air.
In addition, in the internal burr removal process, since the amount of projection material that accumulates in the groove due to the blow of compressed air is small, processing is performed when the rotation of the product to be processed is stopped at the position where the projection is concentrated and projected in the groove of the product to be processed. Time can be shortened.

  Hereinafter, a shot blasting apparatus for a product having a groove portion according to the present invention will be described with reference to the accompanying drawings. The present invention can be applied to remove burrs formed in a groove of a product to be processed, such as a cast product or a machined product, and the shot processing apparatus according to the present embodiment is shown in FIG. As shown in FIG. 2, the projection chamber body 2 that projects the projection material S onto the product 1 to be processed, and the inside of the projection chamber body 2 (projection chamber) is set as a booth by a liner, and the radiation 3 in three directions. A rotating booth 5 which is divided into two and has three processing booths 4 and rotates at the intersection of the radiations about the central axis C, and is disposed in each processing booth 4 of the rotating booth 5 to hold the processed products 1 and hold the processed products 1 A rotary cage 6 having a mechanism that rotates in the center, and a centrifugal projection device that projects a projection material S onto a product 1 to be processed disposed in a processing booth 4 disposed outside the projection chamber body 2 and positioned in an external deburring zone 21 7 and internal bar An air nozzle 8 for injecting the projection material S using compressed air to the product 1 to be processed located in the treatment booth 4 located in the removal zone 22, and a compressed air supply device P connected to the compressed air supply device P by an air pipe P1 to pressurize the projection material S. The pressurized tank 9 stored while being mixed, the mixing valve 10 for mixing the projection material S stored in the pressurized tank 9 and the compressed air, and the injection amount adjustment installed in the piping connecting the pressurized tank 9 and the mixing valve 10 A valve 11, a transport hose 12 that connects the mixing valve 10 and the air nozzle 8, a storage hopper 13 that stores the projection material S supplied to the centrifugal projection device 7 and the pressurized tank 9, and the centrifugal projection device 7 and the pressurized tank 9 Are connected to the centrifugal projection device 7 and the pressurized tank 9 from the storage hopper 13. A projection amount adjusting gate 15 for adjusting the amount of projection material S, projection material circulating apparatus 16 is installed to transport shot material S that has accumulated in the projection chamber bottom is projected back into a storage hopper 13.

  In FIG. 1, the projection material circulation device 16 is installed in a screw conveyor 17 installed in the lower part of the projection main body 2, a bucket elevator 18 installed on one side of the screw conveyor 17, and a projection material throwing unit 19 in the upper part of the bucket elevator. The rotary screen 20 is provided.

The product 1 to be processed is placed in the rotating cage 6 by the worker M or robot in the detachment zone 23. The rotary booth 5 rotates 1/3, the product 1 to be processed moves to the external deburring zone 21 and is projected by the centrifugal projection device 7 while being rotated by the rotating cage 6 (external deburring step). After the projection, the rotary booth 5 rotates again by 1/3, the product 1 to be processed moves to the internal burr removal zone 22, and stops after the rotating cage 6 rotates the groove of the product 1 to be directed in the projection direction. The compressed air jetted by the air nozzle 8 and the projection material S are processed (internal burr removing step). Here, since the projection material S is accumulated in the groove portion by the external burr removing step, it is desirable to eject only the compressed air and remove the projection material S accumulated in the groove portion before injecting the projection material S. After the projection, the rotary booth 5 rotates again by 1/3, and the product 1 is returned to the desorption zone 23.
The projection material S is projected from the centrifugal projection device 7 and the air nozzle 8, collected at the lower part of the projection chamber body 2, and then transported to the bucket elevator 18 by the screw conveyor 17 connected to the projection chamber body 2. Next, the projection material transported to the upper part by the bucket elevator 18 is sent to the rotary screen 20 through the projection material throwing-out portion 19, and the normal projection material that has passed through the screen is stored in the storage hopper 13. Here, large objects that cannot be removed from the screen, that is, foreign matters such as burrs are discharged outside the apparatus. The projection material S stored in the storage hopper 13 is adjusted in the projection amount by the projection amount adjusting gate 15, and then again passes through the connection pipe 14 and is sent to the centrifugal projection device 7 and the pressurized tank 9. The projection material S sent to the centrifugal projection device 7 is projected again there. On the other hand, the projection material S sent to the pressurizing tank 9 is stored together with the compressed air in the pressurizing tank 9, the injection amount is adjusted by the injection amount adjusting valve 11, and supplied to the mixing valve 10. After being mixed with the jet air by the mixing valve 10, it passes through the transport hose 12 and is projected from the air nozzle 8.

In this embodiment, as the booth, each processing booth is divided into three on the radiation and is a rotating booth that rotates around the intersection of the radiation, but in the present invention, it is divided into three. However, the present invention is not limited to this, and the processing booth can be appropriately selected such as a parallel arrangement or a vertical arrangement.
In the present embodiment, two centrifugal projection devices 7 are used. However, the present invention is not limited to this, and the number can be selected as appropriate. In this embodiment, an air nozzle that simultaneously injects compressed air and a projection material is used. However, the present invention is not limited to this, and a mechanism that injects compressed air and a projection material separately. For example, a mechanism including a centrifugal projection device and an air blow nozzle that ejects compressed air can be used. In the present embodiment, the product to be processed is stopped at the position where the projection material faces the groove. However, the present invention is not limited to this. For example, the grooves are arranged vertically and horizontally. The product to be processed can be projected while rotating the product to be processed.
Furthermore, in the shot blasting apparatus for the product to be processed having the groove portion of the present embodiment, the projection material circulating device 16 can use the bucket elevator 18 if the projection material S accumulated in the lower part of the projection chamber body 2 can be transported to the storage hopper 13. However, the present invention is not limited thereto, and for example, a projection material circulation device using a belt conveyor, a screw conveyor, an air transport pipe, or the like can be used.
Moreover, it is preferable that a projection material sorting device is installed in the projection material circulation device 16 in order to remove foreign matters such as burrs mixed in the projection material. The blasting material separation device is not particularly limited in the present invention as long as the burrs and the blasting material can be separated. For example, a wind separator, a vibrating screen, a rotary screen, or the like is appropriately used. Can do.
In addition, a product to be processed having a groove to which the present invention is applied is not only a metal part having a large opening in the groove, but also a shape having a narrow minimum opening and a deep depth, specifically, depth / minimum. It can be set as the metal component etc. which have a groove | channel, a fine hole, etc. whose opening length is 5-20. Further, the removal target is not limited to burrs, and any may be used as long as it aims to remove foreign matters unnecessary for the product to be treated such as sand and scale.

Next, examples of the present invention will be described, but the present invention is not limited to such examples. In this example, the shot blasting apparatus of the above-described embodiment is used in order to remove casting burrs generated during casting of an aluminum die cast product (a casting mainly composed of aluminum) as a product to be processed. Here, the aluminum die-cast product has a vertical dimension of 300 mm, a horizontal dimension of 200 mm, and a thickness of 50 mm. Moreover, the shape of the groove part formed in an aluminum die-cast product has an opening of 4 mm and a depth of 40 mm. The rotational speed of the aluminum die-cast product was 30 rpm (external burr removal step) by the rotating cage. The projection material used was a zinc projection material having an average particle diameter of 1.0 mm and an average hardness of HV100. The amount of projection was 130 kg / min for each of the centrifugal projection apparatuses (two units) used as the projection apparatus used in the external burr removal process, and 10 kg / min for the air nozzle used as the projection apparatus used in the internal burr removal process. Here, the set pressure of compressed air was 0.3 MPa, and the projection time was set for each step 30 s.
FIG. 3 shows a state (untreated product) inside the groove (depth 40 mm) of an untreated aluminum die-cast product. FIG. 4 shows the state (partially treated product) inside the groove (depth 40 mm) of an aluminum die cast product that has undergone only the external burr removal step. FIG. 5 shows a state (example) inside the groove (depth 40 mm) of the aluminum die-cast product subjected to the processing of the external burr removal step and the internal burr removal step.
As is clear from the results of the present example, the partially treated product (FIG. 4) subjected only to the external deburring process has not changed much from the untreated product (FIG. 3) and is not sufficiently treated. It can be seen that in the example (FIG. 5) subjected to the processing of the external burr removing step and the internal burr removing step, the dents by the projection material are sufficiently adhered and the internal processing is efficiently performed.

1 is a front view of a shot blasting apparatus according to an embodiment of the present invention. It is sectional drawing of the AA line of the shot blasting apparatus concerning one embodiment of this invention. It is a figure which shows the state inside the groove | channel of an unprocessed aluminum die-cast product. It is a figure which shows the state inside the groove | channel of the aluminum die-cast product which performed only the external burr removal process. It is a figure which shows the state inside the groove | channel of the aluminum die-cast product which performed the process of an external burr removal process and an internal burr removal process.

Explanation of symbols

1 Product to be treated 2 Projection chamber body 4 Processing booth 5 Rotating booth 6 Rotating cage 7 Centrifugal projection device 8 Air nozzle 9 Pressurizing tank 10 Mixing valve 11 Injection amount adjusting valve 12 Transport hose 13 Storage hopper 14 Connection pipe 15 Projection amount adjusting gate 16 Projection Material Circulation Device 17 Screw Conveyor 18 Bucket Elevator 19 Projection Material Throwing Portion 20 Rotary Screen 21 External Burr Removal Zone 22 Internal Burr Removal Zone 23 Desorption Zone P Compressed Air Supply Device S Projection Material

Claims (5)

A shot blasting method for a product to be processed having a groove,
In order to remove large burrs formed on the outside of the product to be processed, an external burr removing step of rotating the product to be processed and projecting the projection material onto the product to be processed;
A shot blasting method including an internal burr removing step of projecting a projection material onto a product to be processed while being blown into the groove of the product to be processed with compressed air in order to remove foreign matters formed inside the groove of the product to be processed . 2. The shot blasting method according to claim 1, wherein the internal burr removing step uses an air nozzle that simultaneously jets compressed air and a projection material. 3. The shot blasting method according to claim 1, wherein in the internal burr removal step, the product to be processed stops at a position where the projection material faces the groove. A shot blasting apparatus for a product to be processed having a groove,
A projection chamber body that projects the projection material onto the product to be treated;
A booth equipped with a processing booth for a desorption zone, an external deburring zone, and an internal deburring zone, which are arranged inside the projection chamber body and divided into three by a liner;
A rotating cage that is arranged in each processing booth of the booth and has a mechanism for holding the processed product and rotating around the processed product;
A centrifugal projection device for projecting a projection material to a product to be processed installed in a processing booth located outside the projection chamber body and located in the external deburring zone;
An air nozzle for injecting a projection material using compressed air to a product to be processed located in a processing booth located in the internal deburring zone;
A pressurized tank that is connected to the compressed air supply device by air piping and stores the projection material while being pressurized;
A mixing valve that mixes the projection material stored in the pressurized tank with the compressed air;
An injection amount adjusting valve installed in a pipe connecting the pressurized tank and the mixing valve;
A transport hose connecting the mixing valve and the air nozzle;
A storage hopper for storing the projection material supplied to the centrifugal projection device and the pressurized tank;
A connecting pipe connecting the centrifugal projection device and the pressurized tank to the storage hopper;
A projection amount adjusting gate arranged in each connecting pipe for adjusting the amount of the projection material supplied from the storage hopper to the centrifugal projection device and the pressurized tank;
A shot blasting device comprising: a projection material circulating device that transports the projection material that has been projected and accumulated in the lower part of the projection chamber main body to the storage hopper again. 5. The shot blasting apparatus according to claim 4, wherein each of the processing booths in the booth is a rotary booth that is divided into three on the radiation and rotates around the intersection of the radiations.