JPWO2017212721A1 - Hole inner surface processing apparatus and hole inner surface processing method - Google Patents

Abstract

The hole inner surface processing device (10) is formed in a bottomed cylindrical shape, and a horizontal hole nozzle (injecting the projection material fed together with air into the cylinder to the outside from a projection hole formed in a part of the outer peripheral surface. 14), a drive shaft (42), a servo motor (16) for reciprocatingly driving the drive shaft (42) in a predetermined angular range, and a drive shaft (42) of the servo motor (16). A motor side gear (44) attached to the servo motor (16) and rotating with the drive shaft (42), and a nozzle side gear (28) attached to the side hole nozzle (14) and rotating with the side hole nozzle (14). The motor side gear (44) and the nozzle side gear (28) mesh directly or indirectly so that the operation of the drive shaft (42) of the servo motor (16) is applied to the horizontal hole nozzle (14). Communicated side hole A gear drive unit for reciprocally rotated at a predetermined angular range about the cylindrical axis L of the nozzle (14) a transverse hole nozzle (14) and (18), the.

Description

  The present disclosure relates to a hole inner surface processing apparatus and a hole inner surface processing method.

  Patent Document 1 discloses a core sand removing device and a removing method. In the core sand removing device and the removing method, the oblique injection nozzle is inserted into the hollow portion (hole) formed in the object to be processed (hereinafter referred to as “work”), and the oblique injection nozzle is formed. The workpiece is rotated while projecting the projection material from the injection port. Thereby, the projection material is applied to the entire circumference of the inner surface of the hole of the workpiece, and the inner surface of the hole of the workpiece is cleaned.

JP-A-9-314469

  However, in the configuration disclosed in Patent Document 1, only a part of the inner surface of the hole of the work cannot be cleaned, and the projection material is projected to a range where the cleaning is unnecessary. For this reason, the structure disclosed in Patent Document 1 has room for improvement from the viewpoint of improving the processing efficiency.

  In this technical field, it is desired to obtain a hole inner surface treatment apparatus and a hole inner surface treatment method that can improve the processing efficiency.

  A hole inner surface processing apparatus according to one aspect of the present disclosure is formed in a bottomed cylindrical shape, and injects a projection material fed together with air into the cylinder from a projection hole formed in a part of the outer peripheral surface. And at least one reciprocating rotation driving mechanism for reciprocatingly driving the driving shaft in a predetermined angular range, and a drive shaft of the reciprocating rotation driving mechanism. And a motor side gear that rotates together with the drive shaft of the reciprocating rotation drive mechanism, and a nozzle side gear that is attached to the horizontal hole nozzle and rotates together with the horizontal hole nozzle. The motor side gear and the nozzle side gear are directly or indirectly By engaging, the operation of the drive shaft of the reciprocating rotation drive mechanism is transmitted to the horizontal hole nozzle, and the horizontal hole nozzle is reciprocally rotated within a predetermined angular range around the cylindrical axis of the horizontal hole nozzle. It has one gear drive unit.

  In this apparatus, the operation of the drive shaft of the reciprocating rotation drive mechanism is transmitted to the horizontal hole nozzle via the gear drive unit. Since the reciprocating rotation driving mechanism is driven to reciprocate in a predetermined angular range, the horizontal hole nozzle reciprocates in a predetermined angular range around the cylindrical axis of the horizontal hole nozzle. At this time, since the motor side gear and the nozzle side gear mesh with each other directly or indirectly, the followability of the horizontal hole nozzle to the movement of the drive shaft of the reciprocating rotation drive mechanism is improved. Therefore, management of the angle range in the reciprocating rotational movement of the horizontal hole nozzle becomes easy. When only a part of the hole inner surface of the workpiece is to be cleaned, this device rotates the horizontal hole nozzle in a reciprocating manner corresponding to the target portion of the hole inner surface of the workpiece, so that the projection material is applied to the target target portion. Can be projected.

  In one embodiment, the reciprocating rotational drive mechanism may be a servo motor. The servo motor may be capable of adjusting an angle range in which the drive shaft is driven to reciprocate.

  In this apparatus, the drive shaft of the servo motor can adjust the angle range when it is driven to reciprocate. Therefore, the angle range during the reciprocating rotation of the horizontal hole nozzle that reciprocally rotates by the operation of the drive shaft of the servo motor can be similarly adjusted. For this reason, this apparatus can easily change the range in which the projection material is projected even when machining a workpiece having a different target polishing range on the inner surface of the hole of the workpiece. Thereby, this apparatus can improve processing efficiency corresponding to various workpieces.

  In one embodiment, the at least one side hole nozzle may have a plurality of side hole nozzles. The plurality of horizontal hole nozzles may be unitized in the apparatus housing.

  According to this apparatus, since the plurality of horizontal hole nozzles are unitized in the apparatus casing, the plurality of horizontal hole nozzles can be moved simultaneously by moving the apparatus casing. Therefore, this apparatus moves the apparatus casing to move the plurality of horizontal hole nozzles to the hole inner surface of the work even when the target area for cleaning on the inner surface of the hole of the work is wide. By projecting, the projection material can be efficiently projected onto the workpiece. Thereby, this apparatus can further improve processing efficiency.

  In one embodiment, the plurality of horizontal hole nozzles may reciprocate within a predetermined angular range about the cylindrical axis of each horizontal hole nozzle by one reciprocating rotation drive mechanism and a driving force transmission mechanism.

  According to this device, the plurality of horizontal hole nozzles are reciprocally rotated by the single reciprocating rotation driving mechanism and the drive transmission mechanism, so that the device can have a simple structure. Thereby, this apparatus can suppress the cost of an apparatus.

  In one embodiment, the at least one reciprocating rotation driving mechanism may include a plurality of reciprocating rotation driving mechanisms. The at least one gear driving unit may have a plurality of gear driving units. The plurality of horizontal hole nozzles may be provided with a reciprocating rotation driving mechanism and a gear driving unit, respectively. Each horizontal hole nozzle may reciprocate within a predetermined angle range about the cylindrical axis by operation of a corresponding reciprocating rotation drive mechanism.

  According to this apparatus, since each of the plurality of horizontal hole nozzles is provided with a reciprocating rotation driving mechanism and a gear driving unit, the reciprocating rotation of each horizontal hole nozzle can be performed by changing the control of each reciprocating rotation driving mechanism. The angle range of each can be adjusted. Therefore, this apparatus can project a finer projection material that matches the workpiece. Thereby, this apparatus can process more appropriately according to the hole inner surface of a workpiece | work.

  The hole inner surface processing method according to another aspect of the present disclosure is formed in a bottomed cylindrical shape, and the projection material fed together with air into the cylinder is externally projected from a projection hole formed in a part of the outer peripheral surface. At least one horizontal hole nozzle to be ejected, a drive shaft, and at least one reciprocating rotation drive mechanism for driving the drive shaft to reciprocate within a predetermined angular range, and a drive shaft of the reciprocating rotation drive mechanism are attached. And a motor side gear that rotates together with the drive shaft of the reciprocating rotation drive mechanism, and a nozzle side gear that is attached to the horizontal hole nozzle and rotates together with the horizontal hole nozzle. The motor side gear and the nozzle side gear are directly or indirectly , The operation of the drive shaft of the reciprocating rotation drive mechanism is transmitted to the horizontal hole nozzle, and the horizontal hole nozzle is reciprocally rotated around the cylindrical axis of the horizontal hole nozzle within a predetermined angle range. The first step of inserting the horizontal hole nozzle into the hole of the object to be processed, and the cleaning of the horizontal hole nozzle on the inner surface of the hole of the object to be processed. And a second step of projecting the projection material while reciprocatingly rotating around the cylindrical axis center of the horizontal hole nozzle corresponding to the target range.

  In this method, the horizontal hole nozzle is inserted into the workpiece in the first step, and the projection material is projected while reciprocatingly rotating the horizontal hole nozzle about the cylindrical axis in the second step. Since the angle range in which the horizontal hole nozzle reciprocates corresponds to the target polishing range on the hole inner surface of the workpiece, it is possible to suppress the projection material from being projected to the other range and cleaned. Thereby, this method can improve processing efficiency.

  In one embodiment, at least one side hole nozzle may have a plurality of side hole nozzles, and the plurality of side hole nozzles may be unitized in the apparatus housing. And a some horizontal hole nozzle may be simultaneously inserted in the inside of the hole of a to-be-processed object at a 1st process, and a projection material may be projected from a plurality of horizontal hole nozzle at a 2nd process.

  In this method, a plurality of horizontal hole nozzles are inserted into the workpiece in the first step, and the projection material is projected while reciprocatingly rotating the plurality of horizontal hole nozzles about the cylindrical axis in the second step. Therefore, even when the target area for cleaning on the inner surface of the workpiece hole is wide, the projection material can be efficiently projected by projecting the projection material from the plurality of horizontal hole nozzles. Thereby, this method can further improve the processing efficiency.

  In one embodiment, in the hole of the object to be processed into which a plurality of horizontal hole nozzles can be inserted, the parts corresponding to the respective horizontal hole nozzles are not in direct communication with each other or the parts are directly connected to each other. When communicating and spaced apart, a plurality of horizontal hole nozzles may be inserted into the hole inner surface of the object to be processed, and the projection material may be simultaneously projected from the plurality of horizontal hole nozzles. And when the site | part corresponding to each horizontal hole nozzle is directly communicating and adjoining within the hole of the to-be-processed object which can insert a several horizontal hole nozzle, it adjoins in several horizontal hole nozzles. The horizontal hole nozzles may project the projection material onto the inner surface of the hole of the object to be processed at different timings.

  According to this method, when the parts corresponding to the plurality of horizontal hole nozzles are not in direct communication with each other on the inner surface of the workpiece hole or are separated from each other even if they are in direct communication with each other, The workpiece can be efficiently polished by simultaneously projecting the projection material from the plurality of inserted horizontal hole nozzles. Further, in this method, when the portions corresponding to the plurality of horizontal hole nozzles on the inner surface of the workpiece are in direct communication and close to each other, the adjacent horizontal hole nozzles project at different timings in the plurality of horizontal hole nozzles. Since the material is projected onto the inner surface of the hole of the workpiece, the inner surface of the hole of the workpiece can be cleaned while suppressing interference between the projection materials projected from the plurality of horizontal hole nozzles. Thereby, this method can be sharpened appropriately according to the workpiece.

  Here, “directly communicating” indicates that a portion that communicates one portion corresponding to the horizontal hole nozzle and the other portion on the inner surface of the hole of the workpiece is formed in a substantially linear shape.

  In one embodiment, the mass ratio (A / B) between the mass A of the projection material projected per unit time from the projection hole of the horizontal hole nozzle and the mass B of the air is 0.3 or more and 0.9 or less. May be.

  According to this method, by setting the mass ratio of the projection material projected from the projection port of the horizontal hole nozzle to the mass B of air and the mass ratio of 0.3 to 0.9, the hole inner surface of the workpiece and the horizontal hole nozzle Even if the gap is narrow, the projection material can be projected without the projection material staying. Thereby, this method can be sharpened even when the space between the hole inner surface of the workpiece and the horizontal hole nozzle is narrow.

  According to the hole inner surface treatment apparatus and method according to the present disclosure, the processing efficiency can be improved.

FIG. 1 is a partial cross-sectional view showing the main part of the hole inner surface processing apparatus according to the first embodiment. FIG. 2 is a schematic diagram illustrating an operation example of reciprocal rotation in the horizontal hole nozzle of the hole inner surface processing apparatus according to the first embodiment. FIG. 3 is a diagram illustrating the workpiece. FIG. 4 is a partial cross-sectional view showing the main part of the hole inner surface processing apparatus according to the comparative example. FIG. 5 is a partial cross-sectional view showing the main part of the hole inner surface processing apparatus according to the second embodiment. FIG. 6 is a partial cross-sectional view showing the main part of the hole inner surface processing apparatus according to the third embodiment. FIG. 7 is a table showing experimental results.

(First embodiment)
Hereinafter, the hole inner surface processing apparatus and the hole inner surface processing method according to the first embodiment of the present disclosure will be described with reference to the drawings. FIG. 1 is a partial cross-sectional view showing the main part of the hole inner surface processing apparatus according to the first embodiment.

  As shown in FIG. 1, the hole inner surface processing apparatus 10 includes an apparatus housing 12, a horizontal hole nozzle 14, a servo motor 16 (an example of a reciprocating rotation driving mechanism), a gear driving unit 18, and an angle adjusting device 20. have. The apparatus housing 12 constitutes a part of a housing (not shown) of the hole inner surface processing apparatus 10. A horizontal hole nozzle 14 is attached to a hollow device case 12 so as to be rotatable about a cylindrical axis L. A servo motor 16 is attached at a position adjacent to the horizontal hole nozzle 14 in the apparatus housing 12.

  The horizontal hole nozzle 14 has a bottomed cylindrical shape and extends along the vertical direction of the apparatus. A projection hole (not shown) is formed in a part of the outer peripheral surface of the lower end 24 of the horizontal hole nozzle 14. As an example, the lateral hole nozzle 14 has an outer diameter of 8 mm and an inner diameter of 5 mm from the lower end portion 24 to the substantially central portion in the longitudinal direction. Further, the projection hole is formed in a substantially circular shape when the projection hole is viewed from the surface so as to communicate the inside and the outside of the horizontal hole nozzle 14. As an example, the inner diameter of the projection hole is 5 mm. The projection material fed into the cylinder of the horizontal hole nozzle 14 together with air is jetted from the projection hole to the outside of the horizontal hole nozzle 14.

  An upper end portion 26 of the horizontal hole nozzle 14 is inserted into the apparatus housing 12. A nozzle-side gear 28 constituting a part of the gear drive unit 18 is attached to a portion corresponding to the inside of the apparatus housing 12 in the upper end portion 26 of the horizontal hole nozzle 14. The nozzle side gear 28 is formed in a disc shape, and meshing teeth 30 are formed on the outer peripheral surface. The nozzle side gear 28 is provided such that the plate thickness direction is the vertical direction of the apparatus. The nozzle-side gear 28 is provided so that the drive shaft center is located at the same position as the cylindrical shaft L extending in the vertical direction of the horizontal hole nozzle 14.

  A holder 32 is provided on the upper side of the horizontal hole nozzle 14 in the apparatus housing 12. The holder 32 has a lower end 34 attached to the upper surface 36 of the apparatus housing 12. One end of a hose 40 is attached to the upper end 38 of the holder 32. The other end of the hose 40 is connected to an air blast tank (not shown). The projection material is fed into the holder 32 through the inside of the hose 40 together with the compressed air. In addition, an opening (not shown) of the upper end portion 26 of the horizontal hole nozzle 14 is disposed inside the holder 32. Therefore, the projection material and compressed air from the hose 40 are sent into the cylinder of the horizontal hole nozzle 14.

  The servo motor 16 is attached to the upper surface 36 of the apparatus housing 12. The drive shaft 42 of the servo motor 16 is inserted into the apparatus housing 12. A motor-side gear 44 constituting a part of the gear drive unit 18 is attached to the drive shaft 42 of the servo motor 16. The motor-side gear 44 is formed in a disc shape and has meshing teeth 46 on the outer peripheral surface. The motor side gear 44 is provided such that the plate thickness direction is the vertical direction of the apparatus. The motor-side gear 44 is provided such that the center of rotation thereof is at the same position as the axis L <b> 2 extending in the vertical direction of the drive shaft 42 of the servomotor 16. The gear drive unit 18 is configured by directly engaging the motor side gear 44 and the nozzle side gear 28 provided in the side hole nozzle 14. The gear drive unit 18 is configured such that the motor side gear 44 and the nozzle side gear 28 are directly meshed with each other. However, the present invention is not limited to this, and other gears are interposed between the motor side gear 44 and the nozzle side gear 28. It is good also as a structure which provides and indirectly meshes.

  An angle adjusting device 20 is connected to the servo motor 16. As an example, the angle adjusting device 20 includes a controller that inputs an angular range for reciprocating rotation, a servo amplifier that sends an operation signal to the servo motor 16 based on an instruction from the controller, and an encoder that monitors the operating state of the servo motor 16. (Both not shown). Then, the drive shaft 42 of the servo motor 16 is driven to reciprocate within the angle range input to the controller of the angle adjusting device 20.

  The operation of the drive shaft 42 of the servo motor 16 is transmitted to the side hole nozzle 14 via the gear drive unit 18. Since the servo motor 16 is driven to reciprocate in a predetermined angle range, the horizontal hole nozzle 14 reciprocates in a predetermined angle range around the cylindrical axis L of the horizontal hole nozzle 14. FIG. 2 is a schematic view showing an operation example of reciprocating rotation in the horizontal hole nozzle 14 of the hole inner surface processing apparatus 10 according to the first embodiment. The horizontal hole nozzle 14 reciprocally rotates in an angle range indicated by an arrow in the figure.

  Next, a hole inner surface processing method applied to the above-described hole inner surface processing apparatus 10 will be described. FIG. 3 is a diagram illustrating the workpiece. Symbol (A) in FIG. 3 is a plan view of the workpiece, and symbol (B) is a cross-sectional view showing the inside of the workpiece indicated by symbol (A). As shown by the symbols (A) and (B) in FIG. 3, the workpiece 50 is a processing target and has a substantially rectangular cubic shape in plan view. The work 50 has an internal path 52 (an example of a hole in the object to be processed) formed therein. Note that a plurality (four in this embodiment) of insertion ports 54 are formed in the upper surface 51 of the work 50 so as to communicate with the inside of the internal path 52. In addition, each part corresponding to the insertion port 54 in the internal path 52 is configured not to communicate directly.

  The work 50 has its outer peripheral surface including the upper surface 51 polished in advance by another shot blasting apparatus. At this time, the projection material enters the internal path 52 from the insertion port 54, so that the portion A of the internal path 52 that is relatively close to the insertion port 54 is sharpened. However, since the projecting material does not hit other portions in the internal path 52, the state is not cleaned.

  In order to perform the hole inner surface processing, first, the horizontal hole nozzle 14 of the hole inner surface processing apparatus 10 is inserted into one of the insertion ports 54 of the workpiece 50 (an example of the first step). Then, in accordance with the target polishing range of the workpiece 50, the projection material is projected while the horizontal hole nozzle 14 is reciprocally rotated about the cylindrical axis L (see the arrow in FIG. 2 and FIG. 3B). (Example of the second step). The cleaning target range is a range set in advance as a target of the cleaning. In the present embodiment, the blast target range is a range in which scouring other than the portion A of the internal path 52 is not performed.

  The projection material projected from the horizontal hole nozzle 14 in the “second step” is projected from the horizontal hole nozzle 14 together with the compressed air. Assuming that the mass of the projection material projected per unit time is A and the mass of the compressed air at this time is B, the mass ratio A / B of the projection material to the compressed air per unit time is 0.3 or more. Also good. When the mass ratio A / B is smaller than 0.3, since there are few projection materials projected per unit time, there is a possibility that the cleaning ability cannot be sufficiently exhibited. Moreover, 0.9 or less may be sufficient as mass ratio A / B. When the mass ratio A / B is larger than 0.9, the projecting material stays in the hole of the workpiece 50 and the projecting materials interfere with each other. That is, the mass ratio A / B may be set between 0.3 and 0.9. In a general shot blasting apparatus, the mass ratio A / B is set to 1.4 to 3.3. That is, the mass ratio A / B of the projection material is set lower in the hole inner surface processing method according to the present embodiment than in the shot blast processing method using a general shot blasting apparatus.

  By performing the above processing in the other insertion ports 54 in the same manner, the projection material is projected to a range other than the portion A in the internal path 52, so that a wide range in the internal path 52 is sharpened.

(Operation and effect of the first embodiment)
Next, the operation and effect of this embodiment will be described. Here, the operation and effect of this embodiment will be described using the proportionality shown in FIG. FIG. 4 is a partial cross-sectional view showing the main part of the hole inner surface processing apparatus according to the comparative example. Note that the same reference numerals are given to the same components as the comparative embodiment, and the description thereof is omitted.

  As shown in FIG. 4, a belt driving unit 100 is provided inside the apparatus housing 12. The belt drive unit 100 includes a motor-side pulley 102 attached to the drive shaft 42 of the servo motor 16 and a nozzle-side pulley 104 attached to the lateral hole nozzle 14. The motor-side pulley 102 and the nozzle side A belt 106 is hung on the pulley 104. Then, the operation of the drive shaft 42 of the servo motor 16 is transmitted to the lateral hole nozzle 14 via the belt drive unit 100. Since the servo motor 16 in the proportional relation is set to rotate in one direction, the horizontal hole nozzle 14 rotates in one direction, and the projection material is applied to the entire circumference of the inner surface of the hole of the workpiece.

  In the case of the configuration based on proportionality, the projection material is applied to the entire circumference of the hole inner surface of the workpiece. Therefore, when only a part of the hole inner surface of the workpiece is to be cleaned, the projection material is projected to a range where no cleaning is required. become. Therefore, it is conceivable that the servo motor 16 is driven to reciprocate in an angle range corresponding to the target cleaning range on the inner surface of the workpiece hole. However, in this case, slipping may occur between the belt 106 and the motor-side pulley 102 and the nozzle-side pulley 104. Further, depending on the tension of the belt 106, there is a possibility that the operation of the drive shaft 42 of the servo motor 16 is not sufficiently transmitted to the lateral hole nozzle 14. Therefore, the horizontal hole nozzle 14 does not follow the movement of the drive shaft 42 of the servo motor 16, and the angular range of the drive shaft 42 in the servo motor 16 reciprocally rotated corresponding to the work target erasing target range; There is a possibility that the angular range of reciprocating rotation of the horizontal hole nozzle 14 is different. In other words, there is a possibility that the projecting material cannot be sufficiently projected onto the target area of the workpiece to be polished, and there is a possibility that the projecting material is projected to a portion that does not need to be cleaned, so there is room for improvement from the viewpoint of improving machining efficiency. .

  On the other hand, in this embodiment, as shown in FIG. 1, the operation of the drive shaft 42 of the servo motor 16 is transmitted to the side hole nozzle 14 via the gear drive unit 18. Since the servo motor 16 is driven to reciprocate in a predetermined angular range, the horizontal hole nozzle 14 reciprocates in a predetermined angular range around the cylindrical axis L of the horizontal hole nozzle 14. At this time, since the motor-side gear 44 and the nozzle-side gear 28 are meshed directly or indirectly, the followability of the horizontal hole nozzle 14 with respect to the movement of the drive shaft 42 of the servomotor 16 is improved. Therefore, management of the angle range in the reciprocating motion of the horizontal hole nozzle 14 is facilitated. When it is desired to clean only a part of the inner surface 52 of the internal path 52 of the workpiece 50, the hole inner surface processing apparatus 10 rotates the horizontal hole nozzle 14 in a reciprocating manner corresponding to the target area of the hole inner surface of the workpiece. The projection material can be projected onto the sweep target range. Thereby, the hole inner surface treatment apparatus 10 can improve processing efficiency.

  In addition, the angle range in which the drive shaft 42 of the servomotor 16 is driven to reciprocate by the angle adjusting device 20 can be adjusted. Therefore, the angle range during the reciprocating rotation of the horizontal hole nozzle 14 reciprocatingly rotated by the operation of the drive shaft 42 of the servo motor 16 can be similarly adjusted. For this reason, the hole inner surface processing apparatus 10 can easily change the range in which the projection material is projected by the angle adjusting device 20 even when processing a workpiece having a different target range of the blast on the hole inner surface of the workpiece. It becomes. Thereby, the hole inner surface treatment apparatus 10 can improve processing efficiency corresponding to various workpieces.

  Further, the horizontal hole nozzle 14 is inserted into the internal path 52 of the workpiece 50 in the first step, and the projecting material is projected while the horizontal hole nozzle 14 is reciprocally rotated about the cylindrical axis L in the second step. Since the angular range of the reciprocating rotation of the horizontal hole nozzle 14 corresponds to the target cleaning range (other than the portion A) on the inner surface of the internal path 52 of the workpiece 50, the projection material projects into the other range (portion A). It is possible to suppress being cleaned. Thereby, the hole inner surface treatment apparatus 10 can improve processing efficiency. Furthermore, the hole inner surface processing apparatus 10 can suppress damage to the portion A due to the projection of projection material more than necessary on the portion A of the internal path 52.

  Furthermore, by setting the mass ratio of the projection material projected from the projection port of the horizontal hole nozzle 14 and the mass B of the air to a mass ratio that satisfies the relationship of 0.3 or more and 0.9 or less, the internal path 52 of the workpiece 50 is obtained. The projection material can be projected without stagnation of the projection material even at a location where the space between the inner surface of the nozzle and the horizontal hole nozzle 14 is narrow. Thereby, the hole inner surface processing apparatus 10 can sharpen even when the space between the inner surface of the internal path 52 of the workpiece 50 and the horizontal hole nozzle 14 is narrow.

  The effects described above are evident in the experimental results described below. In this experiment, the state of shot blasting when the projecting material of steel shot φ0.3 was projected at different mass ratios from the lateral hole nozzle 14 shown in FIG. It was. The projection pressure of the projection material was 0.5 MPa, and the projection time was 16 seconds.

  The experimental result was as shown in FIG. FIG. 7 is a table showing experimental results. As shown in FIG. 7, when the polishing was performed under the conditions of the mixing ratio (mass ratio) of 0.3 and 0.9, the workpiece was successfully polished, and the polishing was performed under the conditions of the mixing ratio of 1.3 and 1.8. When swept, the workpiece was not sufficiently polished. If it explains supplementarily, since it will become easy to retain a projection material between the horizontal hole nozzle 14 and the hole inner surface of a workpiece | work when mass ratio becomes high (projection material increases), the retained projection material and the projected projection material and Are more likely to interfere with each other, making it difficult for the workpiece to be polished by shot blasting.

(Second Embodiment)
Next, the hole inner surface processing apparatus and the hole inner surface processing method according to the second embodiment of the present disclosure will be described with reference to FIG. FIG. 5 is a partial cross-sectional view showing the main part of the hole inner surface processing apparatus according to the second embodiment. In addition, about the same component as 1st Embodiment mentioned above, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 5, the hole inner surface processing apparatus 56 according to the second embodiment is unitized by providing a plurality of horizontal hole nozzles 14 as compared with the hole inner surface processing apparatus 10 according to the first embodiment. The difference is that each servo motor 16 and the driving force transmission mechanism 60 are operated, and the others are the same.

  That is, the apparatus housing 58 is provided with a plurality of side hole nozzles 14 adjacent to each other (four in this embodiment). The distances between the plurality of horizontal hole nozzles 14 are set to be substantially the same as the distances between the plurality of insertion openings 54 of the workpiece 50 shown by the symbol (A) in FIG. In addition, a driving force transmission mechanism 60 is provided inside the apparatus housing 58. The driving force transmission mechanism 60 includes a plurality of worm gears 64 (an example of a motor side gear) provided on the drive shaft 62 of the servo motor 16 and a nozzle side gear 28 provided on the lateral hole nozzle 14. .

  The drive shaft 62 of the servo motor 16 extends in the direction orthogonal to the vertical direction of the apparatus and in the vicinity of the plurality of nozzle-side gears 28. The plurality of worm gears 64 provided on the drive shaft 62 are respectively disposed at positions corresponding to the nozzle-side gear 28 on the drive shaft 62. Each worm gear 64 is set to mesh with the corresponding nozzle side gear 28. The servo motor 16 is held in the apparatus housing 58 by a bracket (not shown). The drive shaft 62 of the servo motor 16 is supported by a bearing (not shown) provided inside the apparatus housing 58. The driving force transmission mechanism 60 is configured such that the worm gear 64 and the nozzle-side gear 28 are directly meshed with each other. However, the driving force transmission mechanism 60 is not limited to this and is indirectly provided by providing another gear between the worm gear 64 and the nozzle-side gear 28. It is good also as a structure which meshes.

  Next, a hole inner surface processing method applied to the hole inner surface processing apparatus 56 will be described. In order to actually perform the hole inner surface treatment, first, the device housing 58 is moved, and the hole inner surface treatment device 56 is inserted into the plurality of insertion ports 54 of the work 50 indicated by the symbols (A) and (B) in FIG. Are inserted simultaneously (an example of the first step). Corresponding to the target polishing range of the workpiece 50 (that is, the range in which the portion other than the portion A of the internal path 52 is not cleaned), each of the horizontal hole nozzles 14 is connected to the servo motor 16 by the driving force transmission mechanism 60. The projection material is projected while being reciprocatingly rotated about the cylindrical axis L (see the arrow in FIG. 3B) by the power transmitted from (an example of the second step).

  The mass ratio A / B per unit time with respect to the compressed air of the projection material projected from the horizontal nozzle 14 in the “second step” is set between 0.3 and 0.9, as in the first embodiment. Has been.

(Operation and effect of the second embodiment)
Next, the operation and effect of this embodiment will be described. Also with the above configuration, since the plurality of horizontal hole nozzles 14 are provided and each is operated by one servo motor 16, it is configured in the same manner as the hole inner surface processing apparatus 10 of the first embodiment. The same effect as the embodiment can be obtained. That is, the followability of the horizontal hole nozzle 14 to the movement of the drive shaft 62 of the servo motor 16 is improved. Therefore, management of the angle range in the reciprocating motion of the horizontal hole nozzle 14 is facilitated. And the hole inner surface processing apparatus 56 can project the projection material by reciprocatingly rotating the horizontal hole nozzle 14 corresponding to only a part of the inner surface of the internal path 52 of the workpiece 50. Thereby, the hole inner surface treatment apparatus 56 can improve processing efficiency.

  In addition, since a plurality of the horizontal hole nozzles 14 are provided and are unitized in the apparatus housing 58, the hole inner surface processing device 56 moves the plurality of horizontal hole nozzles 14 simultaneously by moving the apparatus housing 58. Can do. Therefore, even when the target area for cleaning on the hole inner surface of the workpiece 50 is wide, the hole inner surface processing apparatus 56 moves the apparatus housing 58 to move the plurality of horizontal hole nozzles 14 to the hole inner surface of the workpiece 50, and thereby The projection material can be projected from the horizontal hole nozzle 14. Therefore, the hole inner surface processing device 56 can efficiently project the projection material onto the workpiece 50. Thereby, the hole inner surface treatment apparatus 56 can further improve processing efficiency.

  Further, since the plurality of horizontal hole nozzles 14 are reciprocally rotated by one servo motor 16 and the driving force transmission mechanism 60, the hole inner surface processing device 56 can have a simple structure. Thereby, the hole inner surface processing apparatus 56 can suppress the cost of an apparatus.

  Furthermore, a plurality of horizontal hole nozzles 14 are inserted into the work 50 in the first step, and a projection material is projected while reciprocating the plurality of horizontal hole nozzles 14 around the cylindrical axis L in the second step. Therefore, even when the blast target range on the inner surface of the internal path 52 of the workpiece 50 is wide, the hole inner surface processing device 56 can project the projection material efficiently by projecting the projection material from the plurality of horizontal hole nozzles 14. it can. Thereby, the hole inner surface treatment apparatus 56 can further improve processing efficiency.

  Moreover, by making the mass ratio (A / B) satisfying the relationship of 0.3 or more and 0.9 or less between the mass A of the projection material projected from the projection port of the horizontal hole nozzle 14 and the mass B of the air, the inner surface of the hole The processing device 56 can project the projection material without the projection material staying even at a narrow space between the inner surface of the internal path 52 of the workpiece 50 and the horizontal hole nozzle 14. Thereby, the hole inner surface processing apparatus 56 can sharpen even when the space between the inner surface of the internal path 52 of the workpiece 50 and the horizontal hole nozzle 14 is narrow.

  In the present embodiment, four horizontal hole nozzles 14 are provided. However, the present invention is not limited to this, and the number of horizontal hole nozzles 14 may be increased or decreased according to the workpiece.

(Third embodiment)
Next, a hole inner surface processing apparatus and a hole inner surface processing method according to a third embodiment of the present disclosure will be described with reference to FIG. FIG. 6 is a partial cross-sectional view showing the main part of the hole inner surface processing apparatus according to the third embodiment. In addition, about the same component as 1st Embodiment mentioned above, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 6, the hole inner surface processing apparatus 66 according to the third embodiment is provided with a plurality of side hole nozzles 14 as a unit as compared with the hole inner surface processing apparatus 10 according to the first embodiment. The difference is that the servomotor 16 and the gear drive unit 18 are individually operated, and the other points are the same.

  That is, a plurality of horizontal hole nozzles 14 and servo motors 16 are provided adjacent to each other in the apparatus housing 68 (four in this embodiment). The distances between the plurality of horizontal hole nozzles 14 are set to be substantially the same as the distances between the plurality of insertion openings 54 of the workpiece 50 shown by the symbol (A) in FIG. In addition, gear drive units 18 corresponding to the respective side hole nozzles 14 and the servo motors 16 are provided inside the apparatus housing 68.

  Next, a hole inner surface processing method applied to the above-described hole inner surface processing apparatus 66 will be described. In order to perform the hole inner surface processing, first, the apparatus housing 68 is moved, and the hole inner surface processing apparatus 66 is inserted into the plurality of insertion ports 54 of the workpiece 50 indicated by the symbols (A) and (B) in FIG. A plurality of horizontal hole nozzles 14 are simultaneously inserted (an example of a first step). Then, corresponding to the target grinding range of the workpiece 50 (that is, the range where the portion other than the portion A of the internal path 52 is not cleaned), the horizontal hole nozzles 14 are respectively connected via the gear drive units 18. The projecting material is projected while reciprocatingly rotating around the cylindrical axis L (see the arrow in FIG. 3B) by the transmitted power from each servo motor 16 (an example of the second step).

  The mass ratio A / B per unit time with respect to the compressed air of the projection material projected from the horizontal nozzle 14 in the “second step” is set between 0.3 and 0.9, as in the first embodiment. Has been.

(Operations and effects of the third embodiment)
Next, the operation and effect of this embodiment will be described. Even with the above configuration, a plurality of horizontal hole nozzles 14 are provided, and each is configured similarly to the hole inner surface processing apparatus of the first embodiment, except that each is operated by a servo motor 16 provided individually. The same effect as the first embodiment can be obtained. That is, the followability of the horizontal hole nozzle 14 to the movement of the drive shaft 42 of the servo motor 16 is improved. Therefore, the hole inner surface processing device 66 can easily manage the angle range in the reciprocating motion of the horizontal hole nozzle 14. The hole inner surface processing device 66 can project the projection material by reciprocatingly rotating the horizontal hole nozzle 14 corresponding to only a part of the inner surface of the internal path 52 of the workpiece 50. Thereby, the hole inner surface processing apparatus 66 can improve processing efficiency.

  In addition, since the plurality of horizontal hole nozzles 14 are provided and unitized in the apparatus housing 68, the hole inner surface processing device 66 moves the plurality of horizontal hole nozzles 14 simultaneously by moving the apparatus housing 68. Can do. Therefore, even when the target area for cleaning on the hole inner surface of the workpiece 50 is wide, the hole inner surface processing apparatus 66 moves the apparatus housing 68 to move the plurality of horizontal hole nozzles 14 to the hole inner surface of the workpiece 50, thereby The projection material can be projected from the horizontal hole nozzle 14. Therefore, the hole inner surface processing device 66 can efficiently project the projection material onto the workpiece 50. Thereby, the hole inner surface treatment apparatus 66 can further improve processing efficiency.

  Furthermore, since the servo motor 16 and the gear drive unit 18 are provided for each of the plurality of horizontal hole nozzles 14, the hole inner surface processing device 66 changes the control of each servo motor 16, thereby changing each horizontal hole nozzle 14. The angular range of 14 reciprocating rotations can be adjusted respectively. Therefore, the hole inner surface processing device 66 can project a finer projection material that matches the workpiece 50. Thereby, the hole inner surface processing device 66 can perform processing more appropriately according to the inner surface of the internal path 52 of the workpiece 50.

  Further, the hole inner surface processing device 66 has a mass ratio (A / B) satisfying a relationship of 0.3 or more and 0.9 or less between the mass A of the projection material projected from the projection port of the horizontal hole nozzle 14 and the mass B of the air. And Thereby, the hole inner surface processing apparatus 66 can project the projection material without the projection material remaining even in a narrow space between the inner surface of the internal path 52 of the workpiece 50 and the horizontal hole nozzle 14. Therefore, the hole inner surface processing device 66 can sharpen even when the space between the inner surface of the internal path 52 of the workpiece 50 and the horizontal hole nozzle 14 is narrow.

(Modification of the second and third embodiments)
In the second and third embodiments described above, a plurality of horizontal hole nozzles 14 are simultaneously inserted into a plurality of insertion openings 54 provided in the work 50 shown in FIG. 3 to project a projection material. That is, as indicated by the symbols (A) and (B) in FIG. 3, the portions (insertion ports 54) corresponding to the plurality of horizontal hole nozzles 14 in the internal path 52 of the workpiece 50 are not in direct communication with each other. Or, if they are in direct communication but are separated (for example, 50 mm or more), the internal path 52 of the workpiece 50 is efficiently polished by simultaneously projecting the projection material from the plurality of lateral hole nozzles 14. Can do.

  On the other hand, when the parts (insertion ports 54) corresponding to the plurality of horizontal hole nozzles 14 in the internal path 52 of the workpiece 50 are in direct communication and close to each other (as an example, 50 mm or less), for example, a plurality of horizontal holes A mechanism or the like for individually operating the nozzles 14 in the vertical direction of the apparatus is provided, and the adjacent horizontal hole nozzles 14 are inserted into the insertion ports 54 at different timings to project the projection material. In addition to the above-described configuration, the plurality of horizontal hole nozzles 14 are simultaneously inserted in a state where the insertion ports 54 are blown out one by one, and the projection material is projected. A plurality of horizontal hole nozzles 14 may be simultaneously inserted into 54 and the adjacent horizontal hole nozzles 14 may be projected at different timings. Furthermore, a plurality of horizontal hole nozzles 14 may be simultaneously inserted into the insertion port 54 and the projection material may be projected at different timings. As a result, the inside of the workpiece 50 can be sharpened while suppressing interference between the projection materials projected from the plurality of horizontal hole nozzles 14.

  In the first to third embodiments described above, the servo motor 16 is provided as the reciprocating rotation drive mechanism. However, the present invention is not limited to this, and the motor is provided with a link mechanism to reciprocate the horizontal hole nozzle 14 within a predetermined angle range. It is good also as a structure to rotate. Further, the angular range of the reciprocating rotation of the horizontal hole nozzle 14 may be adjustable by making it possible to adjust the position of the joint or the like of the link mechanism.

  The embodiments of the present disclosure have been described above. However, the present disclosure is not limited to the above, and various modifications other than the above can be implemented without departing from the scope of the present disclosure. Of course.

  DESCRIPTION OF SYMBOLS 10 ... Hole inner surface processing apparatus, 14 ... Side hole nozzle, 16 ... Servo motor, 18 ... Gear drive part, 28 ... Nozzle side gear, 42 ... Drive shaft, 44 ... Motor side gear, 50 ... Workpiece (object to be processed), 52 ... Internal path (hole to be processed), 64 ... Worm gear (motor side gear), L ... Cylindrical shaft.

Claims (9)

At least one horizontal hole nozzle that is formed into a bottomed cylindrical shape and that injects the projection material fed into the cylinder together with air from the projection hole formed in a part of the outer peripheral surface;
A drive shaft, and at least one reciprocating rotation drive mechanism for reciprocatingly driving the drive shaft in a predetermined angle range;
A motor side gear attached to the drive shaft of the reciprocating rotation drive mechanism and rotating together with the drive shaft of the reciprocating rotation drive mechanism; and a nozzle side gear attached to the horizontal hole nozzle and rotating together with the horizontal hole nozzle; The motor side gear and the nozzle side gear mesh with each other directly or indirectly so that the operation of the drive shaft of the reciprocating rotation drive mechanism is transmitted to the horizontal hole nozzle so that the horizontal hole nozzle is centered on the cylindrical axis of the horizontal hole nozzle. At least one gear driving part that reciprocates in a predetermined angle range;
A hole inner surface treatment apparatus having The reciprocating rotation drive mechanism is a servo motor, and the servo motor is capable of adjusting an angle range for reciprocatingly driving the drive shaft.
The hole inner surface processing apparatus according to claim 1. The at least one horizontal hole nozzle has a plurality of horizontal hole nozzles, and the plurality of horizontal hole nozzles are unitized in the apparatus housing.
The hole inner surface processing apparatus according to claim 1 or 2. The plurality of horizontal hole nozzles reciprocally rotate in a predetermined angular range about the cylindrical axis center of each horizontal hole nozzle by the single reciprocating rotation driving mechanism and the driving force transmission mechanism.
The hole inner surface processing apparatus according to claim 3. The at least one reciprocating rotational drive mechanism has a plurality of reciprocating rotational drive mechanisms,
The at least one gear driving unit has a plurality of gear driving units;
The plurality of horizontal hole nozzles are provided with the reciprocating rotation driving mechanism and the gear driving unit, respectively, and each horizontal hole nozzle is brought into a predetermined angular range around the cylindrical axis by the operation of the corresponding reciprocating rotation driving mechanism. Reciprocally rotate,
The hole inner surface processing apparatus according to claim 3. At least one horizontal hole nozzle that is formed into a bottomed cylindrical shape and that injects the projection material fed into the cylinder together with air from the projection hole formed in a part of the outer peripheral surface;
A drive shaft, and at least one reciprocating rotation drive mechanism for reciprocatingly driving the drive shaft in a predetermined angle range;
A motor side gear attached to the drive shaft of the reciprocating rotation drive mechanism and rotating together with the drive shaft of the reciprocating rotation drive mechanism; and a nozzle side gear attached to the horizontal hole nozzle and rotating together with the horizontal hole nozzle; The motor side gear and the nozzle side gear mesh with each other directly or indirectly so that the operation of the drive shaft of the reciprocating rotation drive mechanism is transmitted to the horizontal hole nozzle so that the horizontal hole nozzle is centered on the cylindrical axis of the horizontal hole nozzle. At least one gear driving part that reciprocates in a predetermined angle range;
Applied to a hole inner surface treatment apparatus having
A first step of inserting the horizontal hole nozzle into the hole of the object to be processed;
A second step of projecting the projecting material while reciprocatingly rotating the horizontal hole nozzle around the cylindrical axis of the horizontal hole nozzle corresponding to the erasing target range in the hole inner surface of the object to be processed;
A method for treating the inner surface of a hole. In the hole inner surface processing apparatus, the at least one horizontal hole nozzle has a plurality of horizontal hole nozzles, and the plurality of horizontal hole nozzles are unitized in an apparatus housing,
A plurality of the horizontal hole nozzles are simultaneously inserted into the holes of the object to be processed in the first step, and the projection material is projected from the plurality of horizontal hole nozzles in the second step;
The hole inner surface processing method according to claim 6. Inside the hole of the object to be processed into which the plurality of horizontal hole nozzles can be inserted, the parts corresponding to the horizontal hole nozzles are not in direct communication with each other, or the parts are in direct communication with each other. If spaced apart, insert the plurality of horizontal hole nozzles into the inner surface of the hole of the object to be processed and simultaneously project the projection material from the plurality of horizontal hole nozzles,
In the inside of the hole of the object to be processed into which the plurality of horizontal hole nozzles can be inserted, when the portions corresponding to the respective horizontal hole nozzles are in direct communication and close to each other, in the plurality of horizontal hole nozzles, The adjacent horizontal hole nozzles project the projection material onto the hole inner surface of the object to be processed at different timings, respectively.
The hole inner surface processing method according to claim 7. The mass ratio (A / B) between the mass A of the projection material projected per unit time from the projection hole of the horizontal hole nozzle and the mass B of the air is 0.3 or more and 0.9 or less,
The hole inner surface treatment method according to any one of claims 6 to 8.

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