Spray treatment device

Abstract

The present invention provides a jet processing device capable of efficiently performing jet processing on a processed object having a small projection range of a jet medium. The jet processing device projects a jet medium (T) to a processed object (W) and collides it, thereby performing surface processing on the processed object. The jet processing device includes a jet mechanism (3) that projects the jet medium (T) toward the processed object (W), and a reflection plate (5) that is provided on a downstream side of a flow of the jet medium (T) with the processed object (W) interposed therebetween, and reflects the jet medium (T) projected from the jet mechanism (3) to the processed object (W), the reflection plate (5) having a reflection surface (5b) that is a concave curved surface having a curvature continuously increasing toward a downstream of the jet medium (T).

Description

Technical Field

[0001] This invention relates to a spray treatment apparatus. Background Technology

[0002] In surface processing such as shot blasting (for descaling, deburring, and surface roughening of workpieces) and shot peening (for improving the fatigue strength of workpieces), a blasting treatment apparatus is used to process the workpiece by projecting or spraying blasting material onto the surface of the workpiece. (See, for example, Patent Document 1)

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: International Publication No. WO2012 / 090531 Summary of the Invention

[0006] When a jet medium is projected onto a workpiece using a projector for jetting treatment, the jetting area of ​​the workpiece within the projection range of the jet medium—that is, the area where the jet medium collides with the workpiece—is sometimes smaller than the projection range of the jet medium. In this case, the jet medium projected into the area where the workpiece is located collides with the workpiece, effectively performing jetting treatment. However, the jet medium projected into the area where the jet medium does not collide with the workpiece does not contribute to the jetting treatment and is therefore redundant. Furthermore, because this jet medium, which does not contribute to the jetting treatment, collides with the interior of the jetting treatment apparatus, it can sometimes cause wear inside the apparatus housing. Consequently, the kinetic energy of the jet medium colliding with the interior of the housing is converted into heat, thereby increasing the internal temperature of the apparatus and sometimes causing the apparatus to become overheated.

[0007] The present invention was made in view of the above-mentioned actual situation. The problem to be solved by the present invention is to provide a spraying treatment device that can efficiently spray a small object with a relatively small projection range of the spraying medium.

[0008] The present invention adopts the following solution to solve the above problems.

[0009] That is, one aspect of the present invention is a spraying treatment apparatus that projects a spraying medium onto and collides with a workpiece to perform surface treatment on the workpiece. The spraying treatment apparatus includes a spraying mechanism and a reflector. The spraying mechanism projects the spraying medium toward the workpiece. The reflector, positioned downstream of the flow of the spraying medium and holding the workpiece between its sides, reflects the spraying medium projected from the spraying mechanism back onto the workpiece. The reflector has a reflective surface that is a concave surface with curvature continuously increasing downstream of the spraying medium.

[0010] According to the present invention, since the reflector has a reflective surface with a curvature that continuously increases downstream of the spray medium, the spray medium that passes through without colliding with the workpiece can be reflected back to the workpiece, thereby enabling efficient spraying.

[0011] In one aspect of the invention, the reflector has an opening on the opposite side of the object being treated when viewed from the spraying mechanism.

[0012] In this respect, since there is an opening on the reflector, it is possible to prevent the sprayed medium from remaining on the reflector.

[0013] In one aspect of the invention, a passage-limiting member is provided at the downstream side of the flow of the jet medium and at the position of the opening of the reflector when viewed from the jet mechanism, to restrict the flow of the jet medium exiting from the opening.

[0014] In this respect, by restricting the flow of the spray medium from the opening by a limiting member, it is possible to prevent the spray medium from damaging the interior of the spray treatment device housing.

[0015] In one aspect of the invention, the longitudinal cross-sectional shape of the reflecting surface of the reflector approximates a parabola y = ax. 2 -b, the parabola takes the positive y-axis as the line from the center of the object being processed toward the spraying mechanism, with the center of the object being processed as the origin, and a and b are positive.

[0016] In this respect, the longitudinal section shape of the reflecting surface of the reflector approximates a parabola y = ax 2 -b, the center of the object being treated is located at the approximate origin, thus enabling the formation of a reflector with an optimal curved surface for reflecting the sprayed medium in the appropriate direction.

[0017] In one aspect of the invention, on the parabola y = ax 2 In -b, a is in the range of 0.001 to 0.009, b is in the range of 10 to 20, and b / a is in the range of 1111 to 0000.

[0018] In this respect, by setting the cross-sectional shape of the reflective surface of the reflector to a shape consistent with a parabola, it is possible to form a reflector with an optimal curved surface for reflecting the jet medium in an appropriate direction.

[0019] In one aspect of the invention, on the parabola y = ax 2 In -b, a is in the range of 0.003 to 0.007, b is in the range of 13 to 17, and b / a is in the range of 1857 to 5667.

[0020] In this respect, by setting the cross-sectional shape of the reflective surface of the reflector to a shape consistent with a parabola, it is possible to form a reflector with an optimal curved surface for reflecting the jet medium in an appropriate direction.

[0021] In one aspect of the invention, the object to be processed is wire.

[0022] In this respect, the wire has a sufficiently small projection range than the jet medium and a circular cross-section, so the jet medium reflected by the reflector collides with the wire efficiently.

[0023] According to the present invention, a spraying treatment apparatus is provided that can efficiently spray a small object with a relatively small projection range compared to the spraying medium. Attached Figure Description

[0024] Figure 1 This is a schematic diagram showing the structure of the spraying treatment apparatus according to an embodiment of the present invention, and is a side view.

[0025] Figure 2 yes Figure 1 A top view of the spray treatment device.

[0026] Figure 3 This is a schematic diagram of the main parts of the spray treatment apparatus according to an embodiment of the present invention.

[0027] Figure 4 From Figure 3 A magnified view taken in the direction of arrow A.

[0028] Figure 5 This is a top view of the reflector according to an embodiment of the present invention.

[0029] Figure 6 This is a diagram used to illustrate the function of the present invention, and it is... Figure 4 The image shows the area near the reflector.

[0030] Figure 7 This is a diagram of an embodiment of the present invention.

[0031] Figure 8 This is a diagram of a comparative example of the present invention.

[0032] Figure 9 This is a diagram of a comparative example of the present invention.

[0033] Figure 10 This is a diagram of a comparative example of the present invention.

[0034] (Symbol Explanation)

[0035] 1. Spraying treatment device

[0036] 3, 3a, 3b Injection mechanism (impeller)

[0037] 5. Reflector

[0038] 5a Opening

[0039] 5b Reflective surface

[0040] 7 By limiting components

[0041] T-jet medium

[0042] W - The object being processed (wire) Detailed Implementation

[0043] (Implementation Method)

[0044] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In this embodiment, an example will be described where the workpiece W has a linear shape, a circular cross-sectional shape, and is a metal wire. Figure 1 This is a schematic diagram showing the structure of the spray treatment apparatus 1 according to an embodiment of the present invention, and is a side view. Figure 2 yes Figure 1 A top view of the spray treatment device 1.

[0045] In addition, the term "projection" in this specification includes any of the following: the projection of the injection medium T by means of the centrifugal force of the impeller, as in the case of using the impeller-type injection mechanism 3; or the projection of the injection medium T by means of compressed air or wind power, as in the case of using the air-type injection mechanism 3.

[0046] A blasting medium refers to a material that impacts and blasts the workpiece. Blasting is a surface treatment of the workpiece, including processes similar to grinding to remove burrs, rust, or scale; sandblasting; or shot peening to work harden the surface through plastic deformation or to apply compressive residual stress. The blasting medium T is selected from various materials such as metals (e.g., iron, zinc, stainless steel), ceramics (e.g., alumina, silicon carbide, zircon), glass, resins (e.g., nylon resin, melamine resin, urea resin), and plant derivatives (e.g., walnut, peach). The shape of the blasting medium T is selected from various shapes such as spherical, polygonal, and cylindrical. For example, in the case of metal particles, spherical particles called blasting particles, polygonal particles with acute angles called grids, or particles with rounded corners of cylindrical or cylindrical shapes called cutting lines can be selected. Various materials and shapes can also be appropriately selected and adopted based on the desired conditions of the blasting treatment.

[0047] like Figure 1 , Figure 2As shown, the spray treatment apparatus 1 includes a spray mechanism 3 and a reflector plate 5 within a projection chamber 15. The spray mechanism 3 projects a spray medium T toward the object to be treated, W. The reflector plate 5, holding the object to be treated W, is positioned downstream of the flow of the spray medium T and reflects the spray medium T projected by the spray mechanism 3 back onto the object to be treated W. That is, the spray mechanism 3, the object to be treated W, and the reflector plate 5 are arranged in that order. A blowdown chamber 17 is provided near the projection chamber 15. The object to be treated W is fed into the projection chamber 15 by an infeed roller 11 and removed from the blowdown chamber by an outfeed roller 13, traveling in one direction along a straight path. In this embodiment, the spray mechanism 3 is an impeller, and a drive motor 9 rotates the impeller via a transmission belt (not shown) to project the spray medium onto the object to be treated W.

[0048] Figure 3 This is a schematic diagram of the main parts of the spray treatment apparatus of this embodiment. Figure 3 The illustration schematically shows the application of the spray medium T to the object being treated, W, via the spray mechanism 3. Figure 4 From Figure 3 A magnified view viewed in the direction of arrow A. (See image below.) Figure 4 As shown, the reflector 5 in this embodiment has a reflective surface 5b with a curvature that continuously increases downstream of the jet medium T.

[0049] Figure 5 This is a top view of reflector 5. (For example...) Figure 4 , Figure 5 As shown, the reflector 5 has an opening 5a on the opposite side of the object being treated, when viewed from the spraying mechanism 3. Here, the width of the opening 5a in the short side direction can be 200% to 50% (but ≥5 mm) of the diameter of the object being treated W. Additionally, as... Figure 3 , Figure 4 As shown, when viewed from the spray mechanism 3, a passage-limiting member 7 is disposed in front of the reflector 5 to restrict the passage of the spray medium T flowing out from the opening 5a. The passage-limiting member 7 is disposed at an angle relative to the direction from the spray mechanism 3 toward the opening 5a. Figure 1 , Figure 2 In the middle, due to the magnification, the limiting component 7 is omitted.

[0050] like Figure 4 As shown, the surface of the reflecting surface 5b of the reflector 5 is approximately a parabola y = ax 2-b, with the line from the center o of the workpiece W toward the spraying mechanism 3 as the y-axis, and the center of the workpiece W as the origin o, and a and b are positive. Here, a is preferably in the range of 0.001 to 0.009, more preferably in the range of 0.003 to 0.007. b is preferably in the range of 10 to 20, more preferably in the range of 13 to 17. Furthermore, b / a is preferably in the range of 1111 to 20000, more preferably in the range of 1857 to 5667. The inventors obtained these preferred numerical ranges from various experiments.

[0051] Next, refer to Figure 1 and Figure 2 The operation of the spray treatment device 1 is explained. The object to be treated, W, is continuously conveyed from the input roller 11 to the output roller 13 via the ejection chamber 17 after being fed into the projection chamber 15. Impellers 3a, 3a that project the spray medium T towards the object to be treated in a horizontal left-right direction, and impellers 3b, 3b that project the spray medium T towards the object to be treated in a vertical direction are provided in the projection chamber 15.

[0052] like Figure 2 As shown, the workpiece W, fed into the projection chamber 15 by the feed roller 11, is sprayed by the impeller 3a from the right side using the spray medium T. After the spraying process from the right side, the workpiece W is further conveyed into the inside of the projection chamber 15 (left side of the paper), where it is sprayed by the impeller 3a from the left side using the spray medium T. After the left-right spraying process, the workpiece W is then... Figure 1 As shown, it is transported to Figure 1 On the left side of the paper, the material is sprayed by the impeller 3b from above using the spray medium T. After the spraying process from above is completed, the material W is further conveyed into the inside of the projection chamber 15 (on the left side of the paper), where it is sprayed by the impeller 3b from below using the spray medium T.

[0053] After being sprayed in four directions (up, down, left, and right), the treated material W is conveyed to the blow-off chamber 17. There, dust and the sprayed medium are separated by brushes, scrapers (not shown), and compressed air (blowing), resulting in a clean state. The clean material is then conveyed to the outside of the spraying treatment device 1 via the transfer roller 13. Furthermore, the circulation device or dust collector mechanism for the sprayed medium based on a screw conveyor or bucket elevator is the same as in the past (for example, see Patent Document 1), therefore, its description is omitted here.

[0054] Figure 6 This is a schematic diagram illustrating the function of the reflector 5, where the spray medium T is projected from below the paper surface toward the object being treated, W. Figure 6As shown, particles p of the spray medium T in track a, which directly collides with the workpiece W, bounce off the workpiece W and are sprayed (track b). At this time, the workpiece W is sprayed. Particles q of the spray medium T in track c, which do not collide with the workpiece W, do not collide with the workpiece W, but pass by the workpiece W. A reflector 5 is disposed downstream of the spray medium T of the workpiece W. The reflective surface 5b of the reflector 5 is a concave surface. The reflective surface 5b is formed such that its curvature continuously increases downstream of the flow of the spray medium T. The longitudinal cross-sectional shape of the reflective surface 5b (i.e., the cross-section horizontal in the direction from the spraying mechanism toward the workpiece W) is preferably formed to approximate y = ax with the center of the cross-section of the workpiece W as the origin. 2 -b. Therefore, the reflective surface 5b is formed such that when particle q collides with the reflective surface 5b, particle q is reflected towards the object being processed W (track d). The reflective surface 5b is formed with a continuously varying curvature. Therefore, the reflection track can be adjusted so that the jet medium T passing through the area that does not collide with the object being processed W is reflected relative to each track towards the center o of the object being processed W.

[0055] Additionally, an opening 5a is formed on the reflector 5b on the opposite side of the object being treated (W) when viewed from the spraying mechanism 3. Particles q that collide with the object being treated (and move downwards in the figure) flow further downwards from the opening 5a (track e). In front of the opening 5a, a limiting member 7 is obliquely positioned in a direction perpendicular to the opening 5a. The particles q moving downwards from the opening 5a collide with the limiting member 7 and are reflected along their track f.

[0056] As described above, in this embodiment, a reflector 5 is provided, which reflects the spray medium T projected from the spraying mechanism 3 onto the object to be treated, W. The reflector 5 has a reflective surface 5b whose curvature continuously increases downstream of the spray medium T, preferably approximately y = ax with the center of the object to be treated as the origin. 2 -b. This approximation allows for the formation of a reflector 5 with an optimal curved surface for reflecting the sprayed medium in the appropriate direction. Therefore, when spraying a workpiece W with a small projection range compared to the sprayed medium T, the reflector 5 can efficiently reflect the sprayed medium T, which does not directly collide with the workpiece W, back to the workpiece W for spraying. Furthermore, in this approximation, a is in the range of 0.001 to 0.009, b is in the range of 10 to 20, and b / a is in the range of 1111 to 20000, enabling efficient reflection of the sprayed medium T towards the workpiece W, thus shortening the spraying time.

[0057] In this embodiment, the metal wire, which is the object to be treated, is subjected to spraying treatment.

[0058] Because the wire is extremely thin relative to the projection range of the spray medium, existing devices contain a significant amount of spray medium that collides with the interior of the spraying device housing instead of the wire. Due to this collision of the spray medium towards the housing, the energy that was not applied to the wire is transferred to the housing, causing the device temperature to rise. Furthermore, devices for spraying wire are generally small in size, resulting in a smaller surface area and lower heat dissipation compared to larger devices. Consequently, the heat generated by the high-energy collision of the spray medium with the interior of the housing accumulates internally, leading to high temperatures. In high-temperature devices, various countermeasures are required, such as installing heat-insulating covers to prevent burns to workers, or controlling the airflow within the device to prevent damage to internal mechanisms due to heat.

[0059] From the above perspective, the spraying treatment apparatus 1 in this embodiment can be appropriately used when spraying wire as the workpiece W. That is, in this embodiment, by using the reflector 5, the spraying medium T, which previously did not collide with the wire, can be reflected by the reflector 5 and collide with the wire, preventing energy loss applied to the spraying medium T and thus efficiently performing the spraying treatment of the wire. Furthermore, since collisions of the spraying medium T toward the housing can be prevented, the energy consumed by collisions outside the wire in the prior art can be reduced, thus preventing the temperature of the spraying treatment apparatus 1 from rising. Furthermore, by optimizing the shape of the reflector 5 as described above, the time required for spraying treatment can be shortened, thus suppressing temperature rise due to heat accumulation.

[0060] An opening 5a is provided on the reflector plate 5 on the opposite side of the object being treated, when viewed from the spraying mechanism 3, thus preventing the sprayed medium T from remaining on the reflector plate 5. Since a passage-limiting member 7 is provided in front of the opening 5a, the passage of the sprayed medium T flowing out of the opening 5a is restricted, and wear on the inner wall of the housing of the spraying treatment device 1 and the device itself is prevented.

[0061] In this embodiment, the limiting member 7 is a plate-shaped body arranged at a certain angle relative to the opening direction of the opening 5a, but it is not limited to this. As long as it prevents the sprayed medium T through the opening 5a from colliding with the housing, its shape is not limited. For example, a metal block with a convex shape or a concave shape can be used as the limiting member 7.

[0062] It should be noted that in the above embodiments, wire is selected as the workpiece W, but the invention is not limited to this. It is effective when the sprayed medium T passes downstream without colliding with the workpiece W. For example, the invention can be effectively used with workpieces W that are rod-shaped or have a smaller projection range than the rod itself.

[0063] In addition, not limited to a long strip shape, in order to process objects with a general shape (e.g., a shape that approximates a cube), the reflector 5 can also be a reflector with a bowl shape and a cross-sectional shape that approximates a parabola.

[0064] Furthermore, in this embodiment, an impeller has been described as the spraying mechanism 3, but it is not limited to this. For example, the present invention is effective even when a nozzle that sprays the spraying medium T together with compressed air toward the workpiece W or a blower that uses wind power to blow the spraying medium T is used as the spraying mechanism 3.

[0065] Furthermore, in this embodiment, the case where the cross-sectional shape of the reflective surface 5b of the reflector 5 is parabolic has been described. However, the cross-sectional shape of the reflective surface 5b can also be a shape other than parabolic, as long as the reflective surface is a concave surface with curvature that continuously increases downstream of the jet medium T.

[0066] Furthermore, the present invention is not limited to the above-described embodiments, but also includes various modifications that involve adding, deleting, or transforming structural elements of the above structure.

[0067]

Example

[0068] The following is for reference Figures 7 to 10 The embodiments and comparative examples of the present invention will be described below. Figures 7 to 10 This diagram illustrates how the collision effects of a projected line vary depending on the presence and shape of the reflector. All projection conditions are as follows.

[0069] Projection conditions:

[0070] Spraying medium: steel shot, particle size: Φ0.2, projection speed: 73m / s, projection rate: 2.8kg / min.

[0071] Figure 7 This is an embodiment of the reflector having a concave surface that approximates a parabola, according to an embodiment of the present invention. For example... Figure 7 As shown, the sprayed medium seen in the dashed area R is the sprayed medium that collides with and is reflected from the upper surface of the wire. This allows for effective spraying of the upper surface portion of the wire. The area shown by the dashed line S represents the region where the sprayed medium, which does not directly collide with the wire, is reflected by the reflective surface of the reflector and collides towards the lower surface of the wire. Regarding the reflector of the present invention, as described above, the sprayed medium that would not normally contribute to the spraying process is reflected by the reflector, thereby contributing to the spraying of the lower surface of the wire. As can be seen from the figure, the reflector is symmetrically curved, so not only the sprayed medium in the left area S of the figure, but also the sprayed medium in the right area is reflected by the reflector, thus contributing to the spraying of the wire.

[0072] Figure 8 This is a diagram of a comparative example of the present invention with a reflector having a flat reflective surface arranged horizontally. The portion of region R is... Figure 7 Similarly, the jetting medium that contributes to the jetting process collides with and is reflected from the upper surface of the wire. In region S, the jetting medium that does not directly collide with the wire is reflected by the flat surface of the reflector. It can be seen that, since the reflection direction is vertical, the jetting medium does not collide with the lower surface of the wire. Therefore, it is clear that simply arranging the flat reflector horizontally is insufficient to achieve the effects of this invention.

[0073] Figure 9 This is a diagram showing a comparative example of the present invention where a reflector plate with a flat reflective surface is arranged at an angle relative to the projection direction of the jet medium. The portion of region R is... Figure 7 Similarly, the jetting medium that contributes to the jetting process collides with and is reflected from the upper surface of the wire. In region S, jetting medium that does not directly collide with the wire is reflected by the flat surface of the reflector. In this comparative example, the reflector is arranged at an angle relative to the projection direction of the jetting medium, so the jetting medium is reflected by the reflector and flies obliquely upward, but this jetting medium does not contribute to the jetting process of the wire. It can be seen that simply arranging the flat reflector at an angle does not achieve the effects of the present invention.

[0074] Figure 10 This is a diagram showing the comparison example of the present invention without the reflector configured. The portion of region R is... Figure 7 Similarly, the jetting medium that contributes to the jetting process collides with and is reflected from the upper surface of the wire. In region S, the jetting medium that does not directly collide with the wire passes directly downwards, and these jetting media do not contribute to the jetting process of the wire. Through the above embodiments and comparative examples, it is clear that the effect of the reflector with a concave surface that approximates a parabola of the present invention can be used for the jetting process of jetting media that previously did not contribute to the jetting process.

Claims

1. A spray treatment apparatus that projects a spray medium onto a workpiece and collides with the workpiece to perform surface treatment on the workpiece, characterized in that, include: A spraying mechanism that projects the spray medium toward the object being treated; as well as A reflector plate, which sandwiches the object to be treated and is positioned downstream of the flow of the sprayed medium, reflects the sprayed medium projected from the spraying mechanism back onto the object to be treated. The reflector has a reflective surface, which is a concave surface with curvature that continuously increases downstream of the jet medium. The reflector has an opening on the opposite side of the object being treated, when viewed from the spraying mechanism. Downstream of the flow of the jet medium, and at a position through the opening of the reflector when viewed from the jet mechanism, a passage-limiting member is provided to restrict the flow of the jet medium exiting from the opening.

2. The spray treatment apparatus according to claim 1, characterized in that, The longitudinal section shape of the reflecting surface of the reflector approximates a parabola y=ax. 2 -b, the parabola takes the positive y-axis as the line from the center of the object being processed toward the spraying mechanism, with the center of the object being processed as the origin, and a and b are positive.

3. The spray treatment apparatus according to claim 2, characterized in that, The parabola y=ax 2 In -b, a is in the range of 0.001 to 0.009, b is in the range of 10 to 20, and b / a is in the range of 1111 to 20000.

4. The spray treatment apparatus according to claim 2, characterized in that, The parabola y=ax 2 In -b, a is in the range of 0.003 to 0.007, b is in the range of 13 to 17, and b / a is in the range of 1857 to 5667.

5. The spray treatment apparatus according to any one of claims 1 to 4, characterized in that, The material being processed is wire.

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