JP3849308B2 - Cylindrical workpiece coating film peeling apparatus and its peeling method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a coating film formed on the surface of a cylindrical workpiece, such as a Teflon coating layer formed on the surface of a fixing roller of an electrophotographic copying machine or a photosensitive layer formed on the surface of a photosensitive drum. The present invention relates to a coating film peeling apparatus and a peeling method for peeling the workpiece from the workpiece.
[0002]
[Prior art]
In recent years, in the production of OA equipment such as copiers and facsimiles, from the viewpoint of resource saving, we collect photoconductor drums, fixing rollers, etc. from used OA equipment collected by users and use them as new OA equipment. It has been reused for production. However, since the collected photosensitive layer of the photosensitive drum and the Teflon coating layer of the fixing roller have already deteriorated, when the photosensitive drum and the fixing roller are reused, the photosensitive layer, the Teflon coating layer, etc. After the coating film is removed cleanly from the surface of the cylindrical substrate, it is necessary to re-form these photosensitive layers and Teflon coating layers.
[0003]
Conventionally, as a method of removing a coating film from the surface of these cylindrical base materials (hereinafter, workpieces), a method of peeling the coating film from the surface of the workpiece using high-pressure water discharged from an injection nozzle is known. (Unexamined-Japanese-Patent No. 3-55556, Unexamined-Japanese-Patent No. 6-202533). Specifically, this method arranges a high-pressure water injection nozzle so as to face the workpiece, and discharges the high-pressure water from the injection nozzle in a straight line without diffusing, and discharges the high-pressure water (hereinafter referred to as “high-pressure water”). The coating film is peeled off from the surface of the workpiece by the energy (hereinafter referred to as peeling energy) of hitting the surface of the workpiece by the water jet, and the coating film is removed. Moreover, since the water jet collides with the surface of the workpiece without diffusing, the coating film peeling methods described in these publications rotate the workpiece at a constant speed when removing the coating film. The coating nozzle on the workpiece surface is continuously removed by moving the injection nozzle in the direction of the rotation axis of the workpiece at a predetermined feed speed and jetting a water jet spirally onto the surface of the cylindrical workpiece. ing.
[0004]
[Problems to be solved by the invention]
By the way, in the conventional coating film peeling method configured as described above, the water jet is discharged from the spray nozzle in a straight line without diffusing as described above, and thus the width of the coating film that can be removed per one rotation of the workpiece. Is substantially equivalent to the diameter of the injection nozzle (for example, 0.1 mm), and has a drawback that it takes a considerable time to completely remove the coating film formed on the surface of the workpiece. Therefore, in order to maximize the removal efficiency of the coating film, the feed amount of the spray nozzle per rotation of the work is set to be equal to the diameter of the spray nozzle, and the coating film is removed from the surface of the work in one pass of the water jet. It is required to be completely removed.
[0005]
On the other hand, plunger-type and intensifier-type pumps suitable for generating high-pressure water are accompanied by pressure pulsation, and even if an accumulator is attached after the tail pump, the pulsation cannot be completely removed. It is difficult to always keep the pressure of the water jet discharged from the injection nozzle uniform. For this reason, if it is attempted to completely remove the coating film from the surface of the work in one pass of the water jet as described above, the discharge pressure of the lively water jet is prevented in order to prevent coating film removal failure due to fluctuations in the discharge pressure. Need to be set higher.
[0006]
However, if the water jet discharge pressure is set high, not only the paint film but also the work itself is scraped by the water jet, and the thickness of the work becomes thin. There was a problem that it would be difficult to ensure. In particular, the fixing roll uses aluminum as a material thereof, and the work itself is soft. Therefore, such a problem is likely to occur remarkably.
[0007]
Moreover, in order to ensure the adhesion of the coating film to the workpiece, the surface of the workpiece is usually processed to a predetermined surface roughness, and the workpiece has a surface for removing the coating film from the workpiece for recycling purposes. It is required to remove only the coating film without impairing the surface roughness. However, if the surface of the workpiece is scraped off together with the coating film as described above, the surface roughness of the workpiece greatly deviates from the specified value, and the surface processing of the workpiece must be performed again when forming the coating film again. There is also a problem.
[0008]
The present invention has been made in view of such problems, and the object of the present invention is to remove the coating film from the surface of the workpiece by the water jet while increasing the efficiency of removing the coating film. Removes the workpiece itself as much as possible, and the recycled product from which the coated film has been removed can satisfy the same level of quality as a new product, and the coating film peeling device for the cylindrical workpiece and its peeling method Is to provide.
[0009]
[Means for Solving the Problems]
  In order to achieve the above object, the coating film peeling apparatus for a cylindrical workpiece according to the present invention has an injection nozzle for high-pressure water opposed to a rotating cylindrical workpiece, and the injection nozzle is arranged in the direction of the rotation axis of the workpiece. Assuming a coating film peeling apparatus that discharges a high-pressure water jet toward the workpiece surface while moving it, and removes the coating film formed on the surface of the workpiece from the workpiece by a jet of water jet, The water jet to be discharged is sprayed on the work while being diffused along the direction of the rotation axis of the work, and the feed speed of the spray nozzle is set so that the water jet is repeatedly sprayed to the same location on the work surface.In addition, the distribution of separation energy exerted on the work by the water jet discharged from the injection nozzle is strong at the front end side in the movement direction of the injection nozzle and weak at the rear end side.It is characterized by that.
[0010]
According to such technical means, the water jet discharged from the spray nozzle is sprayed onto the surface of the work in a state of being diffused along the rotation axis direction of the work, so that it can be removed per one rotation of the work. The width of the film can be set large, and even if the feed speed of the spray nozzle is set so that the water jet is repeatedly sprayed to the same location on the surface of the workpiece, the removal efficiency of the coating film is extremely deteriorated There is no. Therefore, even if the water jet is repeatedly sprayed, even if the discharge pressure of the water jet is set low, the coating film can be completely removed and removed, and the situation where the workpiece is scraped off with the coating film is avoided. It becomes possible.
[0011]
Here, diffusing the water jet along the direction of the rotation axis of the work means that the water jet is sprayed with a width in the direction of the rotation axis on the surface of the work. In order to diffuse in the direction of the rotation axis of the workpiece, such a water jet may be discharged in a fan shape from the injection nozzle, or may be discharged in an arbitrary shape such as a cone shape or a pyramid shape.
[0012]
On the other hand, in the present invention, the feed speed of the spray nozzle is set so that the water jet repeatedly sprays the same spot on the work surface a plurality of times. Depending on the feed speed of the spray nozzle, for example, the surface of the work surface While a water jet is sprayed twice on one part, while a water jet is sprayed three times on another part, the water jet may not be sprayed uniformly on the surface of the workpiece. In such a case, spiral stripes are generated on the surface of the workpiece from which the coating film has been removed.
[0013]
Further, when the water jet is diffused and ejected in a fan shape, a conical shape or the like, the separation energy of the water jet has a distribution in the diffusion direction, and the separation energy becomes maximum in the vicinity of the outer edge of the diffused water jet. Therefore, when the coating film is removed from the workpiece using the diffused water jet as it is, even if the water jet is sprayed a uniform number of times on the surface of the workpiece, spiral stripes are formed on the surface of the workpiece. Will occur.
[0014]
  Therefore, from this point of view, the distribution of the separation energy exerted on the workpiece by the water jet discharged from the injection nozzle is controlled, and the separation energy is strong at the front end side in the moving direction of the injection nozzle and weak at the rear end side. To setThere is a need. If the peeling energy of the water jet is controlled in this way, even if the workpiece is scraped off by the water jet having a strong peeling energy and irregularities that form stripes are generated on the surface of the workpiece, the subsequent water jet having a low peeling energy. Therefore, the unevenness can be leveled, and as a result, it is possible to prevent the occurrence of fringes on the surface of the work as much as possible.
[0015]
In this way, as a method for controlling the distribution of the separation energy of the water jet, a shielding plate is provided between the workpiece and the injection nozzle, and among the diffused water jets, from the water jet on the rear end side in the movement direction of the injection nozzle. What is necessary is just to comprise so that a workpiece | work may be shielded.
[0016]
Also, as the distance between the injection nozzle and the workpiece increases, the separation energy that the water jet exerts on the workpiece decreases, so that the discharge direction of the water jet by the injection nozzle is greater than the direction facing the workpiece surface. You may make it incline in the direction opposite to a moving direction. If the spray nozzle is arranged in this way, the distance between the spray nozzle and the work has a distribution within the water jet diffusion range, and the peeling energy becomes strong on the surface of the work having a short distance, and the work having a long distance is taken. Since the peeling energy is weakened on the surface, it is possible to realize the water jet peeling energy distribution as described above.
[0017]
Further, from the same viewpoint, when the water jet is diffused and discharged in a fan shape, the spray nozzle may be arranged so that the diffusion direction of the water jet is inclined with respect to the rotation axis of the workpiece. If the injection nozzle is arranged in this way, since the work is cylindrical, the distance between the injection nozzle and the work has a distribution along the diffusion direction of the water jet, and the water jet diffused for the above-described reason. It becomes possible to control the distribution of the peeling energy. In addition, since the workpiece is cylindrical, the angle at which the water jet sprays on the surface of the workpiece also has a distribution along the direction of diffusion of the water jet. From this point as well, the distribution of the peeling energy is controlled as described above. It becomes possible to do.
[0018]
On the other hand, when the water jet is diffused into a substantially conical shape or a substantially pyramidal shape and discharged from the injection nozzle, the separation energy of the water jet is maximized near the outer edge of the diffusion range, but the work is cylindrical, so The water jet with high energy is not necessarily blown perpendicular to the work surface, and is blown at a very shallow angle with respect to the work surface in the vicinity of the tangent line of the work as seen from the spray nozzle. Therefore, in the vicinity of the workpiece tangent, the effect of peeling the coating film is poor, and in order to peel the coating film uniformly and prevent the formation of streaks on the surface of the workpiece, the water jet is used in the circumferential direction of the workpiece. It is necessary to reduce the distance (standoff) between the spray nozzle and the workpiece (stand-off), and to set the time when the water jet with strong peeling energy hits the same location on the workpiece surface. . Therefore, from this point of view, when the water jet is diffused and discharged into a substantially conical shape or a substantially pyramid shape, the outer edge of the water jet falling on the surface of the work has an elliptical shape whose major axis is the rotation axis direction of the work or The water jet is preferably discharged so as to have a diamond shape.
[0019]
On the other hand, the removal ability of the coating film in the coating film peeling apparatus of the present invention is affected by the discharge pressure of the water jet, the rotation speed of the work, and the moving speed of the spray nozzle. There is an inconvenience that the surface of the workpiece is also shaved. Therefore, from this point of view, a film thickness measurement process is provided for measuring the thickness of the coating film on the workpiece prior to the discharge of the water jet, and the discharge pressure of the water jet and the workpiece are determined according to the measured coating film thickness. It is possible to arbitrarily change the setting values such as the distance between the injection nozzle, the offset amount of the injection nozzle with respect to the rotation axis of the workpiece, and the movement speed of the injection nozzle, and to remove the coating film based on the changed setting value. Preferably, if constituted in this way, it is possible to prevent as much as possible the failure of scraping off the workpiece together with the coating film.
[0020]
In addition, the adhesive strength of the coating film on the workpiece varies depending on the degree of deterioration of the coating film according to the usage date of the workpiece, and even when the coating film has the same film thickness, it can be easily peeled off from the workpiece. There are cases where this is not the case. Therefore, from the viewpoint of more reliably removing only the coating film without damaging the workpiece, the coating film is peeled off by preliminarily discharging a water jet before measuring the thickness of the coating film. It is preferable to measure the thickness of the coating film remaining on the surface of the workpiece later and perform the coating film removal operation again based on the measured value.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the coating film peeling apparatus and the coating film peeling method using the same according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows an embodiment of the coating film peeling apparatus of the present invention. In the figure, reference numeral 1 denotes a cylindrical workpiece having a coating film formed on its surface, reference numeral 2 denotes an injection nozzle that discharges a water jet to the workpiece 1, and reference numeral 3 denotes tap water to the injection nozzle 2. A high-pressure pump that pressurizes and supplies, reference numeral 4 is a pressure-resistant hose that connects the injection nozzle 2 and the high-pressure pump 3, reference numeral 5 is a motor that rotates the workpiece 1 at a predetermined speed, and reference numeral 6 is the injection nozzle 2 that connects the workpiece 1 A linear actuator 7 is moved in the direction of the rotation axis at a predetermined feed speed, and a controller 7 controls the driving of the motor 5 and the linear actuator 6.
[0022]
In this coating film peeling apparatus, the work 1 is rotated by the motor 5 at a predetermined rotational speed, a water jet is discharged from the injection nozzle 2 at a predetermined discharge pressure, and further, the injection nozzle 2 is discharged by the linear actuator 6. The coating film is peeled off from the workpiece 1 while moving the workpiece 1 in the direction of the rotation axis of the workpiece 1 at a predetermined feed speed.
[0023]
FIG. 2 shows factors that affect the effect of peeling the coating film on the workpiece 1. When the coating film is peeled off, the amount of peeling energy given to the surface of the work 1 by the water jet becomes a problem, so that the discharge pressure P of the water jet produced by the high-pressure pump 3, the jet nozzle 2 and the work 1 Distance (standoff) a affects the peeling effect. Further, depending on the angle at which the water jet sprays on the workpiece 1, a difference occurs in the separation energy exerted on the workpiece 1. Therefore, the offset amount b of the injection nozzle 2 with respect to the rotation axis of the workpiece 1 also affects the separation effect. Furthermore, when the injection nozzle 2 is offset with respect to the rotation axis of the workpiece 1, the rotation direction c of the workpiece 1 is also an influencing factor. On the other hand, if the rotation speed d of the work 1 and the feed speed e of the injection nozzle 2 change, the accumulated value of the time during which the water jet is sprayed on the same location on the surface of the work 1 changes. Affects the film peeling effect.
[0024]
The inventors set these influential factors as follows, and actually removed the coating film on the workpiece 1 using the apparatus shown in FIG. The rotation direction of the workpiece 1 was set to a direction opposite to the water jet spraying direction on the surface of the workpiece 1.
Discharge pressure P: 2500 kgf / cm²
Standoff a: 15mm
Offset amount b: 12 mm
Work rotation speed d: 1500 rpm
Feeding speed e: 650 mm / min
[0025]
Further, as the injection nozzle 2, as shown in FIGS. 1 and 2, a water jet is used that diffuses and discharges in a fan shape, and the injection nozzle 2 is arranged so that its diffusion direction coincides with the rotation axis direction of the work 1. Was attached to the linear actuator 6. Further, when the standoff a and the discharge pressure P were set as described above, the width of the water jet sprayed onto the work 1 was about 6 mm.
[0026]
On the other hand, as the work 1, a fixing roll in which a Teflon coat layer was coated on the surface of an aluminum cylindrical sleeve having a diameter of 50 mm was used. The thickness of the Teflon coating layer as a coating film is several tens of μm. The surface of the workpiece is originally processed to have a surface roughness (Ra) of several μm, and the Teflon coating layer is coated thereon.
[0027]
In this embodiment, when the rotation speed of the work 1 is set to 1500 rpm and the feed speed of the injection nozzle 2 is set to 650 mm / min, the feed amount of the injection nozzle 2 per rotation of the work 1 is about 0.43 mm, and the water jet Since the spray width to the workpiece 1 is 6 mm, the water jet is always sprayed a plurality of times on the same portion of the surface of the workpiece 1. For this reason, since the peeling energy of the water jet repeatedly acts on the workpiece surface, the coating film can be reliably removed from the surface of the workpiece 1 even if the discharge pressure of the water jet is set low. . Further, since the water jet is diffused in the direction of the rotation axis of the work 1 and sprayed onto the work 1, the water jet repeatedly acts on the surface of the work 1 without reducing the feed speed of the injection nozzle 2. The number of workpieces 1 that can remove the coating film per unit time did not decrease. By the way, when the diameter of the workpiece 1 is 50 mm, the rotation speed of the workpiece 1 can be 1000 to 3000 rpm (circumferential speed 2600 to 7800 mm / s), preferably 1500 to 3000 rpm (circumferential speed 3900 to 7800 mm / s). ) Is good.
[0028]
For confirmation, the surface of the workpiece 1 after the removal of the coating film was observed, the Teflon coating layer, which was the coating film, was completely removed, and the surface roughness of the workpiece 1 was measured. There was no significant difference from the surface roughness of 1. As a result, it was found that only the coating film was removed and the workpiece itself was not shaved.
[0029]
Incidentally, when the rotation speed of the work 1 and the feed speed of the injection nozzle 2 are set so that the water jet blows only once on the same portion of the surface of the work 1, the discharge pressure of the water jet is 3650 kgf / cm.²If it was not set to the extent, the above-mentioned coating film could not be completely removed, and it was confirmed that the surface of the work 1 itself was also scraped.
[0030]
On the other hand, when the water jet is repeatedly sprayed a plurality of times on the same portion of the surface of the work 1, the feed amount of the spray nozzle 2 during one rotation of the work 1 and the spray width of the spray nozzle 2 on the work 1 Is not completely matched, for example, as shown in FIG. 3, the surface of the work 1 has a different number of sprayed water jets, and there is a difference in the amount of peeling of the coating film. Spiral streaks will occur. However, since there are errors in attaching the work 1 to the coating film peeling device, movement errors of the injection nozzle 2 due to the linear actuator 6, etc., the feed amount of the injection nozzle 2 per rotation of the work 1 and the spraying of the water jet There is almost no coincidence with the width, and it is impossible to prevent the occurrence of streaking by simply ejecting the water jet toward the work 1.
[0031]
Therefore, the inventors of the present application have examined, and as shown in FIG. 4, the separation energy exerted on the work 1 by the water jet diffused and discharged from the injection nozzle 2 is strong on the tip side in the movement direction of the injection nozzle 2, And if it was controlled so that it might become weak in the rear end side, it discovered that a stripe was hard to generate | occur | produce on the surface of the workpiece | work 1 which peeled the coating film. This is because even when the water jet having a strong peeling energy removes the coating film, irregularities occur on the surface of the workpiece 1, the water jet having a low peeling energy subsequently passes through the surface of the workpiece 1. This is probably because the unevenness of the surface of 1 is leveled to a certain extent.
[0032]
Normally, the water jet diffused and ejected from the injection nozzle 2 has a peeling energy showing a maximum value in the vicinity of both ends in the diffusion direction as shown in FIG. It is difficult to obtain a water jet having a peeling energy distribution as shown in FIG. For this reason, in this embodiment, as shown in FIG. 5, a part of the water jet that is diffused and discharged in a fan shape by inserting a shielding plate 8 that moves together with the injection nozzle 2 between the injection nozzle 2 and the work 1. Is blocked by the shielding plate 8 to create a water jet having a distribution approximately approximate to the distribution of the peeling energy shown in FIG. The shielding width of the water jet by the shielding plate 8 is 1/3 to 1/2 of the width of the water jet, preferably about 1/2.
[0033]
7 shows the surface of the workpiece 1 after removing the coating film when the coating film is removed from the surface of the workpiece 1 without using the shielding plate 8, that is, when the water jet having the peeling energy distribution shown in FIG. 5 is used. 8 is a chart showing roughness, while FIG. 8 shows a case where the coating film is removed from the surface of the workpiece 1 using the shielding plate 8, that is, a water jet having a peeling energy distribution shown in FIG. It is a chart which shows the surface roughness of the workpiece | work 1 after a coating film removal. In the former case, it is presumed that spots that are deeper than the periphery appear periodically and stripes are generated on the surface of the work 1, but in the latter case, this is improved and the stripes are improved. Seems to have been reduced. In addition, when the arithmetic average roughness Ra of the surface of the workpiece | work 1 was measured about both, the latter surface roughness Ra became 0.6 micrometer small with respect to the former.
[0034]
Further, in order to obtain the separation energy distribution as shown in FIG. 4, as shown in FIG. 9, the angle θ between the discharge direction of the water jet by the injection nozzle 2 and the surface of the work 1 is adjusted, and the injection nozzle 2 However, the water jet may be discharged in the direction opposite to the moving direction. If the injection nozzle 2 is arranged in this way, the standoff a between the injection nozzle 2 and the workpiece 1 at both ends of the water jet diffusion range is different, and thus a separation energy distribution similar to that in FIG. 4 is obtained. be able to.
[0035]
Further, as shown in FIG. 10, even if the injection nozzle is arranged so that the water jet diffusion direction is inclined at an angle θ with respect to the rotation axis of the work 1, the separation energy distribution as shown in FIG. 4 is obtained. Obtainable. When the water jet diffusion direction is inclined with respect to the rotation axis of the work 1 in this way, the work 1 is cylindrical, and therefore the distance between the injection nozzle 2 and the work 1 is along the water jet diffusion direction. This is because the angle at which the water jet blows against the surface of the workpiece 1 also changes along the direction of diffusion of the water jet.
[0036]
Up to this point, the example in which the water jet is diffused and ejected in a substantially fan shape from the ejection nozzle 2 has been described. However, as shown in FIG. 11, the water jet may be diffused and ejected in a substantially conical shape. . When sprayed in a substantially conical shape, the separation energy of the water jet is maximal on the entire circumference of the outer edge. Therefore, considering the distribution of the separation energy along the rotation axis direction of the workpiece 1, the water jet diffused in a substantially fan shape. Compared with this, a substantially averaged release energy distribution is obtained, and the coating film on the surface of the workpiece 1 can be uniformly peeled by that amount.
[0037]
However, since the work 1 is cylindrical, when a water jet diffused in a substantially conical shape is injected onto the work 1, the angle formed by the work 1 and the water jet has a distribution along the circumferential direction of the work 1. Even if the distribution of the peeling energy along the rotation axis direction of the workpiece 1 is substantially uniform, as the water jet approaches the tangent line of the workpiece 1, the effect of removing the coating film decreases. Therefore, when the water jet is jetted in a substantially conical shape, as shown in FIG. 12, if the outer edge of the water jet falling on the surface of the work 1 is an elliptical shape having the rotation axis direction of the work 1 as a major axis, the water jet The jet strikes from a direction more perpendicular to the circumferential direction of the workpiece 1, the stand-off is shortened, and a water jet with strong peeling energy is applied to the front and rear ends in the moving direction of the injection nozzle 2. Since the time for hitting the same location on the surface of 1 is shortened, the coating film on the surface of the workpiece 1 can be more uniformly removed.
[0038]
Next, FIG. 13 shows an example in which the coating film peeling method of the present invention is applied to the coating film peeling apparatus shown in FIG.
In the figure, reference numeral 9 is a film thickness measurement probe arranged opposite to the surface of the workpiece 1, and reference numeral 10 is a thickness of the coating film on the surface of the workpiece 1 based on a signal from the film thickness measurement probe 9. The reference numeral 11 denotes a feed rate of the spray nozzle 2, a discharge pressure of the water jet, a standoff a of the spray nozzle 2, and an offset amount b based on the thickness of the coating film measured by the film thickness meter 10. Is an arithmetic circuit for instructing the controller. Except for these, the configuration of the coating film peeling apparatus shown in FIG. 1 is the same, and therefore, the same reference numerals are given in the drawing and detailed description thereof is omitted.
[0039]
As the film thickness measuring device 10, an eddy current film thickness meter (manufactured by Sanko Electronics Laboratory, manufactured by Denso Kogyo Co., Ltd.) or an electromagnetic film thickness meter (manufactured by Sanko Electronics Laboratory, manufactured by Kett Science Laboratory) is used. Etc.), fluorescent X-ray film thickness meter (Technos IT, etc.), β-ray film thickness meter (Fischer, etc.), capacitance film thickness meter, etc. can be used. An interferometric film thickness meter using a spectroscope (Otsuka Electronics, etc.) can also be used. Further, the film thickness can be grasped by measuring the outer diameter of the workpiece 1 using laser light.
[0040]
In the coating film peeling apparatus of FIG. 13 configured as above, first, after the thickness of the coating film on the workpiece 1 is measured by the film thickness measuring probe 9 and the film thickness measuring instrument 10, the coating film having such a thickness is applied. The optimum parameters for peeling, that is, the discharge pressure P of the water jet, the feed speed e of the injection nozzle 2, the standoff a of the injection nozzle 2 and the workpiece, and the offset amount b of the injection nozzle 2 with respect to the rotation axis of the workpiece are calculated. And these values are set in the controller 7. As a result, in this peeling apparatus, the influence factor of the peeling effect shown in FIG. 2 is controlled according to the thickness of the coating film, and the coating film can be completely peeled without remaining on the workpiece 1. At the same time, the influence of the water jet on the surface of the workpiece 1 itself can be minimized.
[0041]
Moreover, in this coating film peeling apparatus, first, the coating film is preliminarily peeled off under conditions that allow a part of the coating film to remain, and then the thickness of the remaining coating film is measured. The coating film may be peeled again according to the above. Even if the thickness of the coating film measured by the film thickness measuring instrument 10 is the same, the coating film may be easily peeled off depending on the adhesive strength between the coating film and the workpiece 1 and is uniform depending on the film thickness. This is because if the peeling conditions are set, the workpiece 1 itself may be damaged. In particular, in the recycling of fixing rolls, it is considered that the adhesive strength of the coating film varies greatly depending on the amount of thermal stress applied to the fixing roll, and the peeling conditions are determined by taking into account not only the film thickness but also the adhesive strength. Otherwise, there is a high probability that the surface of the workpiece 1 will be scraped off by the water jet.
[0042]
In that respect, if the coating film is preliminarily peeled prior to the measurement of the film thickness, only the coating film having a certain degree of adhesive strength will remain on the surface of the workpiece. If the peeling conditions are set, it is possible to avoid a situation where the water jet inadvertently scrapes off the workpiece.
[0043]
Further, in order to prevent toner image offset in copying machines, the fixing roll is used while supplying silicon oil to the surface of the fixing roll, and when the Teflon coat layer is peeled off from the surface of the fixing roll, In order to remove the silicon oil adhering to this layer, the fixing roll is washed with a low-pressure water jet. At this time, if the adhesive strength between the Teflon coat layer, which is a coating film, and the fixing roll is low, the coating film may be peeled off during the cleaning operation. It can also be work.
[0044]
Further, when it is not necessary to strictly manage the surface roughness of the workpiece 1, it is not always necessary to measure the thickness of the remaining coating film using the film thickness measuring instrument 10 as described above, and an inexpensive color mark. The sensor 7 is used to check only whether or not the coating film remains on the work 1 after the preliminary peeling operation, and the controller 7 determines the water jet discharge pressure P and the injection nozzle 2 depending on whether or not the coating film remains. The coating film may be removed by switching parameters such as the feeding speed e in two stages.
[0045]
【The invention's effect】
  As explained above, according to the coating film peeling apparatus of the present invention and the coating film peeling method using the same,Water jet discharged from the injection nozzleDiffusion along the workpiece rotation axisTo work while lettingAnd sprayWater jetIn the same placeforSet the spray nozzle feed speed so that it sprays multiple times.In addition, the distribution of the separation energy exerted on the workpiece by the water jet discharged from the injection nozzle should be strong at the front end side in the movement direction of the injection nozzle and weak at the rear end side.Therefore, while setting the discharge pressure of the water jet to a low level, the coating film can be completely removed and removed, avoiding the situation where the workpiece is scraped off with the coating film, and the coating film is removed. It is possible to secure the same quality as the new product in the recycled product.
[0046]
  AlsoShortThe removal of the coating film can be completed in time, and a decrease in the coating film removal efficiency can be avoided.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an embodiment of a coating film peeling apparatus of the present invention.
FIG. 2 is a schematic view showing influential factors of the coating film peeling effect in the coating film peeling apparatus of the example.
FIG. 3 is an explanatory diagram showing a correlation between a feeding speed of an injection nozzle and stripes on a surface of a workpiece.
FIG. 4 is a diagram showing a distribution of peeling energy of a water jet proposed by the present inventors.
FIG. 5 is a diagram showing a separation energy distribution of a water jet diffused and ejected in a sector shape.
6 is a diagram showing a distribution of peeling energy when a part of the water jet shown in FIG. 5 is shielded by using a shielding plate.
7 is a chart showing a state of a workpiece surface when a coating film is removed by the water jet shown in FIG.
8 is a chart showing the state of the workpiece surface when the coating film is removed with the water jet shown in FIG.
FIG. 9 is a diagram showing a separation energy distribution when the water jet discharge direction is inclined with respect to the rotation axis direction of the workpiece.
FIG. 10 is a schematic view showing an example in which the water jet diffusion direction is inclined with respect to the rotation axis of the workpiece.
FIG. 11 is a schematic view showing an example in which a water jet is discharged in a substantially conical shape.
FIG. 12 is a view showing an example in which the water jet is discharged so that the outer edge of the water jet on the surface of the work becomes an ellipse whose major axis is the rotation axis direction of the work.
FIG. 13 is a schematic view showing a configuration of a coating film peeling apparatus to which the method of the present invention is applied.
[Explanation of symbols]
1 ... Work, 2 ... Injection nozzle

Claims (9)

A high-pressure water jet nozzle is placed opposite to the rotating cylindrical workpiece, and a high-pressure water jet is discharged toward the workpiece surface while moving the jet nozzle in the direction of the workpiece rotation axis. A coating film peeling apparatus for removing a formed coating film from the workpiece by a jet of the water jet,
The water jet discharged from the spray nozzle is sprayed onto the work while diffusing along the direction of the rotation axis of the work, and the water jet is fed so that the water jet is repeatedly sprayed to the same location on the work surface. The speed is set , and the distribution of separation energy exerted on the work by the water jet discharged from the injection nozzle is strong at the front end side in the movement direction of the injection nozzle and weak at the rear end side. A cylindrical workpiece coating film peeling device. The coating film peeling apparatus according to claim 1 , wherein a shielding plate is provided between the work and the injection nozzle so as to shield the work from the water jet on the rear end side in the direction of movement of the injection nozzle among the diffused water jets. An apparatus for peeling a coating film on a cylindrical workpiece, characterized in that The coating film peeling apparatus according to claim 1, wherein a water jet discharge direction by the spray nozzle is inclined in a direction opposite to a direction in which the spray nozzle moves rather than a direction facing the workpiece surface. Peeling device. 2. The coating film peeling apparatus according to claim 1, wherein the spray nozzle diffuses and discharges the water jet in a substantially fan shape, and the spray nozzle is arranged so that the diffusion direction of the water jet is inclined with respect to the rotation axis of the workpiece. A coating film peeling apparatus for a cylindrical workpiece characterized by being arranged . The coating film peeling apparatus according to claim 1, wherein the spray nozzle diffuses and discharges the water jet into a substantially conical shape or a substantially pyramid shape . 6. The coating device for coating a cylindrical workpiece according to claim 5, wherein the outer edge of the water jet that pours onto the surface of the workpiece is an elliptical shape or a rhombus shape whose major axis is the rotational axis direction of the workpiece. Membrane peeling device.   A method of peeling a cylindrical workpiece using the coating film peeling apparatus according to claim 1,
  A film thickness measurement step for measuring the thickness of the coating film prior to the water jet discharge, and the water jet discharge pressure, the distance between the workpiece and the injection nozzle, and the rotation axis of the workpiece according to the measured thickness of the coating film. A separation condition setting step for changing at least one set value of the offset amount of the injection nozzle or the movement speed of the injection nozzle, and a peeling step for removing the coating film using the changed set value. A method for removing a coating film from a cylindrical workpiece, characterized in that:   The coating film peeling method according to claim 7, wherein a preliminary peeling process for discharging a water jet toward the workpiece surface is provided prior to the film thickness measuring process, and the coating film remaining on the surface of the workpiece in the film thickness measuring process. A method for peeling a coating film on a cylindrical workpiece, characterized by measuring the thickness of the cylindrical workpiece.   The coating film peeling method according to claim 8, wherein a coating film discrimination process for checking only whether or not a coating film remains on the surface of the workpiece is provided instead of the film thickness measurement process. A method of removing a coating film from a cylindrical workpiece, wherein the set value is changed in two steps depending on whether or not the film remains.

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