JP2006218564A - Surface treatment method and surface treatment device by water jet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface treatment device by a water jet capable of simply and efficiently treating at high speed a surface of a material with a soft part and a hard part mixed therein. <P>SOLUTION: This surface treatment device 1 comprises a water jet generation part 2 generating a fan-like water jet WJ jetted onto a material 9 to be treated, a material supporting part 3 for supporting or putting the material 9, and a treatment direction drive part 4 for relatively moving the material 9 to the water jet WJ. Jet pressure, a distance between a water jet nozzle and a treating surface, relative moving speed between the water jet WJ and the material 9, and the like can be adjusted. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a surface treatment method and a surface treatment apparatus using a water jet, and in particular, high-speed surface treatment of a material having a soft part and a hard part such as wood in which soft summer eyes and hard winter eyes are mixed. The present invention relates to a surface treatment method and a surface treatment apparatus using a water jet, which can easily and efficiently adjust the surface unevenness state according to the state of a material to be treated.

  When wood is used as furniture or building materials, it absorbs ultraviolet rays, and the light on the surface of the wood is scattered by minute irregularities of cells, so the reflected light is weakened and has the advantage of being "friendly to the eyes". However, when the wood surface is painted, the light is reflected on the painted surface and the advantages are lost. For this reason, the grain embossing technique has been conventionally used as one of means for obtaining a beautiful surface without painting.

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There are various techniques for embossing the wood grain, but all of them are done with soft summer eyes and hard winter eyes. As traditional methods, there are tsukuri which makes Natsume pressed to make it stand up, and rain carving when Natsume is scraped with an abrasive to make it stand up. However, skilled skills are required to achieve a uniform finish in these traditional methods.

  As a technique to raise the grain quickly and accurately, the work surface is placed on an elastic body such as urethane rubber so that the work surface is in close contact, and pressure is applied through the pressing plate from the back side of the work surface. There has also been a proposal to obtain a deformation according to the hardness due to the density difference of Natsume (Patent Document 1).

Patent Publication No. Hei 10-015915 “Surface processing method for wood products”

  Now, with the method of Patent Document 1, it is difficult to adjust the surface condition to be treated according to the material and perform efficient treatment. In addition, although automation for processing a large member has been attempted, it is difficult to sufficiently cope with the difference in structure and strength depending on the member, and a method capable of processing a wide area quickly and uniformly has not been proposed yet. .

  On the other hand, by using a water jet that is a high-pressure water jet, the hard scale generated and attached to the inner wall of the heat transfer tube is removed (JP 2001-225036), milled (JP 10-028903), A technique for removing the formed heterogeneous surface layer (Japanese Patent Laid-Open No. 08-267400) has been proposed.

  In addition to wood, for example, when it is necessary to project the tip of a rod-like object embedded in foam material, such as projecting the tip of a copper wire embedded in polystyrene foam for wiring, soft and hard parts There is also a need for a technique that can quickly and efficiently perform surface processing of materials that contain a mixture of materials.

  The problem to be solved by the present invention is based on the above-mentioned problems of the prior art, and surface processing of a material in which a soft part and a hard part are mixed, such as wood in which soft summer eyes and hard winter eyes are mixed. An object of the present invention is to provide a surface treatment method and a surface treatment apparatus using a water jet capable of adjusting the surface irregularity state according to the state of a material to be treated at high speed, simply and efficiently.

  As a result of studying the above problems, the present inventor has found that the above problems can be solved by applying a characteristic that can process only a member having a constant strength of a water jet that is a high-speed water jet, and has reached the present invention. . That is, the invention claimed in the present application as means for solving the above problems, or at least the invention disclosed is as follows.

(1) A surface treatment method for adjusting the unevenness state of a surface to be treated of a material in which wood and other soft parts and hard parts are mixed, and is ejected in advance to a processing strength threshold value between the soft part and the hard part. A surface treatment method using a water jet, characterized in that a water jet with a set pressure is sprayed onto a surface to be treated of a material, and a soft part is pressed by the water pressure to obtain a surface with an uneven state adjusted. .
(2) A surface treatment method for reducing the surface roughness of the surface of the material to be treated, in which a water jet is sprayed onto the surface of the material to be treated, and minute protrusions are removed by the water pressure. A surface treatment method using a water jet, characterized by obtaining a smooth surface with reduced roughness.
(3) The water jet surface treatment method according to (1) or (2), wherein the water jet is a fan-shaped water jet in order to uniformly treat the surface of the material to be treated over a wide range. .
(4) The surface treatment method using a water jet according to (3), which is performed while moving the material to be treated relative to the water jet.
(5) Adjustment of the desired uneven state by adjusting the jet pressure of the water jet, the distance between the water jet outlet and the surface to be processed, and the relative moving speed or number of movements between the water jet and the material to be processed. The surface treatment method using a water jet according to (3) or (4), characterized in that a finished surface is obtained.

(6) In order to adjust the unevenness of the surface to be processed of wood or other materials in which soft and hard portions are mixed by pressing with water pressure, or to reduce the surface roughness of the surface to be processed The surface treatment apparatus includes: a water jet generation unit that generates a fan-shaped water jet for spraying the material to be treated; a material support unit for supporting the material to be treated; and a water jet. A surface treatment apparatus comprising a treatment direction drive unit for relatively moving a material to be treated.
(7) In order to obtain an adjusted surface having a desired uneven state, the jet pressure of the water jet, the distance between the water jet outlet and the surface to be processed, the relative movement speed between the water jet and the material to be processed, or The surface treatment apparatus according to (6), wherein the number of movements is adjustable.

  Since the surface treatment method and the surface treatment apparatus using the water jet according to the present invention are configured as described above, according to this, the soft portion and the hard portion are mixed, such as wood in which soft summer eyes and hard winter eyes are mixed. It is possible to adjust the surface unevenness of the surface of the material being processed at high speed, simply and efficiently, and according to the state of the material to be processed.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a conceptual diagram showing a basic configuration of a surface treatment method using a water jet according to the present invention. Also,
FIG. 2 is a conceptual diagram showing a basic configuration of a surface treatment apparatus using a water jet according to the present invention. As shown in these figures, this method is a method for adjusting the unevenness state of the surface to be treated of the material 9 in which wood and other soft parts and hard parts are mixed, and the soft part and the hard part are previously adjusted. A processing process P2 in which a water jet WJ is generated by a condition setting process P1 including setting an ejection pressure as a processing intensity threshold, and is injected onto a surface to be processed of the material 9 to push the soft portion by the water pressure. After that, the basic structure is to obtain the post-treatment material 10 that has been subjected to the surface treatment in which the uneven state is adjusted.

  That is, in the condition setting process P1, at least the ejection pressure of the water jet WJ is set to the threshold value of the processing strength between the soft part and the hard part of the material 9, and the water jet WJ is generated by the water jet generation part 2 based on the setting. In the processing process P2 in which water is ejected, the soft portion of the surface to be processed of the material 9 is pushed by the water pressure of the water jet WJ, and thereby the material 9 to be processed in which the soft portion and the hard portion are mixed with each other. The post-processing material 10 in which the surface irregularity state is adjusted is obtained.

  Apart from the above purpose, this surface treatment method can also be used for reducing the surface roughness of the surface of the material 9 to be treated. That is, the water jet WJ is jetted onto the surface to be treated of the material 9 to remove and remove minute protrusions by the water pressure, thereby obtaining a smooth surface with reduced roughness.

  In the method of the present invention, a fan-shaped water jet that makes line contact with the surface to be processed is used as the water jet WJ in order to uniformly treat the surface to be processed of the material 9 over a wide range. Moreover, it is set as the structure performed while moving the to-be-processed material 9 relatively with respect to the water jet WJ.

  As conceptually shown in FIG. 2, the relative movement can be performed using a processing direction driving unit 4 having an appropriate configuration. For example, as shown in the drawing, a method (M3) for driving the material 9 to be processed or the material support 3 on which the material 9 is supported so as to be movable in a straight forward / reverse direction with respect to the water jet WJ (M3) or water A method (M2) of driving the jet generator 2 so that it can move in a straight forward / reverse direction with respect to the material 9 to be processed can be employed.

  An embodiment to be described later is merely an experimental example, and as a driving method, a linear guide or other known driving mechanism can be appropriately adopted and configured, and the present invention is not limited to such a driving mechanism.

  In these figures, in the surface treatment method using the water jet of the present invention, the jet pressure of the water jet WJ, the distance between the water jet outlet and the surface to be treated, and the relative movement between the water jet WJ and the material 9 to be treated. The setting for adjusting the speed or the number of movements can be performed in the condition setting process P1. By adjusting and setting the ejection pressure, the distance, the moving speed, and the number of movements in advance, it is possible to obtain a surface with a desired uneven state adjusted.

  FIG. 2 is a conceptual diagram showing the basic structure of the surface treatment apparatus 1 of the present invention as described above. The apparatus 1 generates a water jet generator 2 that generates a fan-shaped water jet WJ for spraying on a material 9 to be treated. And a material support part 3 for supporting or placing the material 9 to be processed, and a processing direction driving part 4 for moving the material 9 to be processed relative to the water jet WJ. The main configuration.

  With this configuration, in the surface treatment apparatus 1, the material 9 to be processed is supported or placed on the material support 3, and the material 9 to be processed is moved relative to the water jet WJ by the processing direction driving unit 4. A fan-shaped water jet WJ generated by the water jet generating section 2 is jetted onto this.

  Furthermore, the surface treatment apparatus 1 can adjust the ejection pressure of the water jet WJ, the distance between the water jet outlet and the surface to be treated, and the relative movement speed or number of movements between the water jet WJ and the material 9 to be treated. Can be configured. Such a configuration may be, for example, a control unit provided separately for each of the water jet generation unit 2 and the processing direction driving unit 4, or may be an electronic computer as a device that sets and controls these conditions in an integrated manner.

  With this configuration, in the surface treatment apparatus 1 of the present invention, the uneven state of the surface to be processed of the material 9 in which wood and other soft parts and hard parts are mixed is pressed by water pressure to adjust to the desired uneven state. Can do. Further, the surface roughness of the surface to be treated of the material 9 can be reduced.

  The water jet generator 2 in FIG. 2 includes a pump (26) for pressurizing and supplying water from the water source to the downstream side as illustrated in FIG. A high-pressure hose for supplying pressurized water from (26), a valve for controlling the ejection of pressurized water, an accumulator (25), a relief valve (24), and a nozzle (21) for ejecting a fan-shaped water jet. be able to.

  The material support portion 3 in FIG. 2 is appropriately fixed such as a guide (32) for fixing the material slidably in a predetermined direction as illustrated in FIG. Although it can comprise and comprise a back wall (31) in which it is provided, the present invention is not limited to this. In short, when the water jet WJ collides with the material 9, the material 9 and the material support portion 3 do not move and vibrate, and the distance between the material 9 and the nozzle tip of the water jet generating portion 2 can be kept constant. Any configuration and specifications may be used.

  The processing direction driving unit 4 in FIG. 2 is driven so that the material 9 to be processed or the material supporting unit 3 on which the processing material 9 is supported can move in a straight forward and reverse direction with respect to the water jet WJ as described above. Or means (M2) for driving the water jet generator 2 so that the water jet generator 2 can move in a straight forward / reverse direction with respect to the material 9 to be processed. it can. As the processing direction driving unit 4, a linear guide or other appropriate driving mechanism can be used.

  The method and apparatus of the present invention described above can be more effective for graining and surface roughness adjustment in wood with soft summer eyes and hard winter eyes mixed together. The present invention is not limited, and any material other than wood can be widely applied as long as the soft part and the hard part are mixed. For example, it can be applied to projecting the tip of a rod-shaped object embedded in foam material, such as projecting the tip of a copper wire embedded in foamed polystyrene for wiring, etc. Processing of soft part and hard part As long as the water jet spray pressure can be set to the intensity threshold, the application field is not selected regardless of the material.

Hereinafter, although the experiment example which applied this invention to wood is demonstrated, this invention is not limited to this experiment example.
<1. Purpose and basic policy of the experiment example>
We tried to develop a method to lift the grain by pushing the summer part while leaving the winter part by applying the characteristics of the water jet, which is a high-speed water jet, that can process only a certain strength member. The jet used a fan-shaped water jet so that a wide range of wood surfaces could be processed at one time, and the pressure was set to several MPa, where wood could be processed and the pump was relatively inexpensive.

<2. Experimental method>
2.1. Experimental Device FIG. 3 is an explanatory diagram showing an outline of the entire water jet generator used in this experimental example. As shown in the drawing, in the present apparatus 20, water is directly supplied from the water supply to the plunger pump 26 and pressurized. Pressurized tap water passes through a high-pressure hose, and is ejected from a nozzle 21 provided in the water tank 22 through a valve, an accumulator 25, and a relief valve 24 to form a water jet.

  4 is a cross-sectional view and a side half cross-sectional view showing a configuration example of a nozzle in the experimental apparatus of FIG. Here, as the nozzle 21, an elliptical nozzle having a nozzle outlet of 1 mm in length and 2 mm in width was used. With this nozzle 21, a fan-shaped water jet having a spread angle of 60 ° could be formed.

  FIG. 5 is an explanatory diagram showing a surface treatment apparatus configuration of a tree experiment example. As shown in the figure, this apparatus is composed of a water jet generator (not shown in its entirety) provided with a nozzle 21 shown in FIGS. 3 and 4, a base 33 and a rear wall 31 fixed thereon. The support unit 30 and the processing direction driving unit 40 are included. In particular, the material support 30 is made of aluminum in order to prevent corrosion due to water. Further, in order to prevent movement and vibration due to the collision of the high-pressure water jet WJ, the pedestal 33 and the back wall 31 of the material support portion 30 are configured by combining 20 mm thick aluminum plates in a T shape, An L-shaped presser was attached.

  The back wall 31 is provided with a guide 32 that suppresses blurring by pressing the material 90 toward the back wall portion 31 from the upper side and that can slide in the vertical direction by the action of the processing direction drive unit 40 described later.

  The processing direction driving unit 40 is configured as follows. That is, the rotating rod 41 is disposed above the material support portion 30, and a thin wire hanging wire 42 is attached thereto, and an installation plate 45 for installing the material 90 to be processed is attached to the end thereof. Further, one end of the rotating rod 41 is connected to the motor 43, and the rotating rod is rotated by the motor 43 at an arbitrary rotation speed and the suspension wire 42 is wound up. It was converted to movement. The installation plate 45 is configured to suppress the movement blur by the guides 32 attached to both side surfaces.

  For the evaluation of the surface roughness of the wood board (test piece, material to be treated) before and after the impact test using a water jet, several points on the test piece were measured using a fixed distance meter with an infrared laser, and the average value was calculated. The absolute average of was used. The details of the wood board surface before and after the collision were observed with a stereomicroscope.

2.2. Experimental conditions Preliminary experiments revealed that the impingement pressure of a fan-shaped water jet rapidly decreased from about 20% to about 30% of the discharge pressure at a standoff distance of about 20 mm, and then maintained at a substantially constant pressure. In the graining by this water jet, since it aims at the processing in a wide range, the installation of the test piece in the distance from the nozzle was desired. Therefore, in this test example, the stand-off distance is fixed at 40 mm where installation is possible. In addition, the pressure was tested in a range of 3 MPa to 5 MPa for the purpose of confirming that a good effect on the wood board could be confirmed at a pressure of 3 MPa or more from a preliminary experiment and for the purpose of using an inexpensive pump.

Feed rate in this ^experiment, 7.98X10 ^-3, 9.79X10 ^-3, and the three conditions of 16.7X10 ^-3 m / s. In the collision experiment, the effect of repeatedly traversing (feeding) as well as once was examined. In addition, as the types of wood of the test pieces, three types of hiba, cedar and cypress were selected as general and different in hardness.

<3. Test results and discussion>
3.1. Change in Surface Roughness (1) Hiba Material FIG. 6 is a graph showing the influence of the feed rate on the surface roughness when the discharge pressure is 5 MPa and the number of feeds is 10. The dotted line at the roughness of about 0.4 mm is the average roughness of the test piece surface before the jet collision test, and the upper and lower broken lines indicate the variation. From the figure, it was confirmed that the unevenness on the surface decreased as the feed rate increased.

FIG. 7 is a graph showing changes in surface roughness when the number of times of feeding is changed. (A), (b), respectively, the feed rate 7.98X10 ^-3 m / s, that it is the result of the test as 16.7X10 ^-3 m / s. As shown in the figure, it was shown that when the discharge pressure is 5 MPa, the unevenness grows as the number of feeds increases regardless of the feed rate. However, when the unevenness became large, the effect of the difference in the grain of the wooden board, or the variation in data increased. In addition, it was shown that the effect | action which makes a surface roughness small occurs rather than growing an unevenness | corrugation in 3 MPa. This was thought to be due to the fact that the uniform impact pressure against the surface of the water jet was crushed by the small protrusions remaining on the specimen before the impact.

(2) Cedar wood FIGS. 8, 9 and 10 are graphs showing the results of wood graining by making a water jet collide against the cedar wood. In each figure, the dotted line and the two broken lines when the surface roughness is about 0.4 mm are the average surface roughness of the test piece before the experiment and its variation, like the hiba material. Cedar wood was softer than hiba wood, and the unevenness after the experiment was shown to be significantly larger.

  FIG. 8 is a graph showing the influence of the feed rate at a discharge pressure of 5 MPa. It was shown that irregularities are less likely to appear as the feed rate increases. In addition, when the number of collisions was 10 times, the data variation was smaller overall. It was considered that there was still room for processing in the case of 5 times, but sufficient processing was performed in the case of repeating 10 times. From the above, it was considered that a certain amount of repeated processing is effective in order to obtain a certain quality.

FIG. 9 is a graph showing the results when the pressure is changed at a feed rate of 7.98 × 10 ⁻³ m / s and the number of feeds is five. Here, it was shown that the unevenness suddenly appeared as the pressure increased.

FIG. 10 is a graph showing the influence of the number of feeds at a feed rate of 7.98 × 10 ⁻³ m / s and a discharge pressure of 5 MPa. In the case of hiba wood, the roughness increased exponentially as the number of feeds increased, but in the case of cedar wood, the increase in surface roughness decreased with increasing number of feeds, probably due to soft wood. It was a result.

(3) Cypress material FIGS. 11, 12, and 13 are graphs showing the test results for the cypress material. Cypress is a very hard wood compared to cedar and hiba, and as a result, conspicuous unevenness as a whole hardly appears even at a discharge pressure of 5 MPa.

  FIG. 11 is a graph showing the influence of the feed rate at a discharge pressure of 5 MPa. It was the result that unevenness did not appear easily when the feed rate increased without changing to hiba and cedar. Further, in the case of cypress wood, the surface roughness is within the range before the experiment when the number of feeds is 5, and it is hardly processed under the conditions of this test example. It was shown that surface treatment may be possible by setting different conditions from the examples. In addition, the data variation was small when the feed rate was large, but when the feed rate was slow, the variation was large because it was in the middle of processing.

FIG. 12 is a graph showing the results when the pressure is changed at a feed rate of 7.98 × 10 ⁻³ m / s and the number of feeds is five. As the pressure increases, the surface roughness increases. However, as shown in FIG. 11, when the number of feeds is five, all are within the range of the surface roughness before the experiment, and no remarkable irregularities appear. . Moreover, the tendency which smooth | blunts the surface was confirmed slightly at 3 MPa like a hiba material.

FIG. 13 is a graph showing the influence of the feed rate at a pressure of 5 MPa and a feed rate of 7.98 × 10 ⁻³ m / s. The unevenness did not appear so much until the number of feeding was 5 times, but it was shown that the surface roughness increased abruptly when it was 10 times.

3.2. Observation of the surface condition The observation result of the surface condition is shown by taking the result of the cedar wood which is soft and has unevenness clearly.
FIG. 14 is a photograph showing surface states before and after a collision experiment with a water jet having a discharge pressure of 5 cedar of cedar. (A) is the case before the collision, (b) is the number of feeds 3 times, (c) is the same number 5 times, (d) is the case 10 times. Comparing the photographs before and after the collision experiment, it was confirmed that the irregularities appeared clearly even when the number of feeds was as few as 3, and that the depth of processing was increased as the number of feeds increased. In addition, it was confirmed that the tip of the irregularities after processing was round as compared with the processed surface of the conventional polishing method.

  FIG. 15 is a photograph showing the surface state when the discharge pressure is 3 MPa. Despite the low pressure, the unevenness was already clearly visible. Referring to the measurement value of the surface roughness described above, it was shown that the unevenness of the cedar wood under this condition reached a value almost equal to the maximum value of the unevenness of the hiba material within the range of the experimental conditions.

In general, physical properties of wood differ greatly depending on the part even if it is a single plate cut from a single tree. However, when wood graining is performed mechanically, it is necessary to process without being affected by such a difference in characteristics.
FIG. 16 is a photograph showing a surface state after a collision test of cedar wood in which white and red are mixed. Here, the experiment was performed at a discharge pressure of 5 MPa, a feed rate of 7.98 × 10 ⁻³ m / s, and a feed count of 5 times. On the photo, the dark part at the top is red and the thin part at the bottom is white. As shown in the figure, it can be confirmed that the unevenness on the white side is slightly reduced as expected due to the difference in physical property values.

  However, no significant difference was observed when viewed as a whole specimen. This is because the impact pressure of the jet flow is directly received in the case of small unevenness, but when it grows in large unevenness, the force acting directly becomes weaker due to the disturbance of the flow in the unevenness, so there is a big difference. It was thought that did not occur. In addition, the rounded surface as a whole is also leveled so that the flow is uniform because the impact force of the jet acts strongly on the sharp part, and in the concave part, it is directly in the center of the dent. It was speculated that not only the impinging force but also the turbulence of the flow due to the escape of the jet caused the polishing action.

<4. Summary>
In this test example, wood graining was performed using a water jet, the change in the surface state under various conditions was examined, and a comparative evaluation with a conventional wood graining method was performed. As a result, large irregularities appeared at high discharge pressure, low feed speed, and multiple feed times. In addition, there was a change in how the irregularities were generated due to the firmness of the wood. In soft cedar wood, large unevenness was generated even at a relatively low pressure, whereas in hard cypress wood, no clear unevenness was observed within the experimental conditions. However, it was confirmed that unevenness appeared even with hard wood by increasing the number of feeds. This was thought to be because the surface was processed after it became moist and soft.

  In addition, it was shown that there is a surface smoothing action at low pressure. This is thought to be due to the fact that when the pressure is low, the entire surface is not processed, but the small protrusions on the surface are pushed in under high pressure locally. .

  Further, it was confirmed that the surface after processing was rounded as a whole as compared with the conventional graining method. It was speculated that polishing along the streamline occurred due to the flow caused by the escape of the jet at the recess.

  According to the surface treatment method and the surface treatment apparatus using the water jet of the present invention, the surface treatment treatment of the material in which the soft part and the hard part are mixed, such as wood having soft summer eyes and hard winter eyes, is performed at high speed. The surface irregularity state can be adjusted easily and efficiently according to the state of the material to be treated. Therefore, the invention has high industrial utility value in the field of surface treatment including the woodworking field.

It is a conceptual diagram which shows the basic composition of the surface treatment method by the water jet of this invention. It is a conceptual diagram which shows the basic composition of the surface treatment apparatus by the water jet of this invention. It is explanatory drawing which shows the outline of the whole water jet generator used for this experiment example. It is sectional drawing and the side half sectional view which show the structural example of the nozzle in the experimental apparatus of FIG. It is explanatory drawing which shows the surface treatment apparatus structure of the tree experiment example. It is the graph which showed the influence of the feed rate with respect to the surface roughness at the time of discharge pressure 5MPa and the frequency | count of feed 10 times about the test of a hiba material. It is a graph which shows the change of the surface roughness when changing the frequency | count of feeding about the test of a hiba material. It is a graph which shows the influence of the feed rate in the discharge pressure of 5 MPa about the test of a hiba material. For testing of hiba material is a graph showing the results of varying the pressure at a feed rate 7.98X10 ^-3 m / s, the feed 5 times. It is a graph which shows the influence of the frequency | count of a feed at the feed rate of 7.98X10 < ^-3 > m / s and the discharge pressure of 5 MPa about the test of a hiba material. It is a graph which shows the influence of the feed rate in the discharge pressure of 5 Mpa about the test of a hinoki material. It is a graph which shows the result at the time of changing a pressure by the feed rate of 7.98X10 < ^-3 > m / s and the frequency | count of feed about the test of a hinoki material. For testing of Hinoki is a graph showing the effect of feed rate at a pressure 5 MPa, feed rate 7.98X10 ^-3 m / s. It is a photograph figure which shows the surface state before and behind the collision experiment by the water jet of discharge pressure 5MPa of a cedar material. It is a photograph figure which shows the surface state in case the discharge pressure of a cedar material is 3 MPa. It is a photograph figure which shows the surface state after the collision experiment of a cedar material in which white and red are mixed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Surface treatment apparatus 2 ... Water jet generation part 3 ... Material support part 4 ... Processing direction drive part 9 ... Material to be processed 10 ... After-treatment material 20 ... Water jet generation apparatus apparatus 21 ... Nozzle 22 ... Water tank 23 ... Pressure gauge 24 ... Relief valve 25 ... Accumulator 26 ... Plunger pump 30 ... Material support part 31 ... Back wall 32 ... Guide 33 ... Pedestal 40 ... Processing direction drive part 41 ... Rotating rod 42 ... Hanging wire 43 ... Motor 45 ... Installation plate 90 ... Material to be processed M2, M3 ... Driving method (means)
P1 ... condition setting process P2 ... processing process WJ ... water jet

Claims (7)

This is a surface treatment method for adjusting the unevenness of the treated surface of wood and other materials in which soft and hard parts are mixed, and the ejection pressure is set in advance as the threshold of the processing strength between the soft and hard parts. A surface treatment method using a water jet, characterized in that a water jet is jetted onto a surface to be treated of a material and the soft portion is pressed by the water pressure to obtain a surface with an uneven state adjusted. A surface treatment method for reducing the surface roughness of a surface to be treated of a material, in which a water jet is jetted onto the surface to be treated of a material and minute protrusions are removed by the water pressure so that the roughness is reduced. A surface treatment method using a water jet, characterized in that a reduced and smooth surface is obtained. The surface treatment method using a water jet according to claim 1 or 2, wherein the water jet is a fan-shaped water jet in order to uniformly treat the surface of the material to be treated over a wide range. The surface treatment method using a water jet according to claim 3, wherein the treatment is performed while moving the material to be treated relative to the water jet. By adjusting the ejection pressure of the water jet, the distance between the water jet outlet and the surface to be treated, the relative movement speed or the number of movements between the water jet and the material to be treated, the surface having a desired uneven state adjusted. The surface treatment method using a water jet according to claim 3 or 4, wherein: Surface treatment to adjust the unevenness of the treated surface of wood or other materials with soft and hard parts mixed with water pressure, or to reduce the surface roughness of the treated surface of the material An apparatus, the apparatus comprising: a water jet generating unit that generates a fan-shaped water jet for spraying on a material to be processed; a material supporting unit for supporting the material to be processed; and a material to be processed with respect to the water jet A surface treatment apparatus comprising a treatment direction drive unit for relatively moving the substrate. In order to obtain an adjusted surface having a desired uneven state, the jet pressure of the water jet, the distance between the water jet outlet and the surface to be processed, the relative movement speed or the number of movements between the water jet and the material to be processed are The surface treatment apparatus according to claim 6, wherein the surface treatment apparatus is configured to be adjustable.