JP2010279978A - Manufacturing method and machining device for elastic member of trimming die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for an elastic member which enables machining of the elastic member of trimming die without generation of soot with a laser machining process that has an excellent machining performance and is free from waste liquid problems, and a machining device therefor. <P>SOLUTION: The elastic member machining device 1 includes mainly a laser oscillator 3, a machining head 5 which is a unit to irradiate laser beam to the elastic member material 15, and a nozzle 7, etc. The machining head 5 includes a reflection plate 9 inside thereof. The reflection plate 9 is a member to reflect the laser beam toward a condenser lens 11. Inside the machining head 5, the condenser lens 11 to condense the laser beam coming from the reflection plate 9 is installed. The condenser lens 11 can focus at a designated condensing distance. Below the condenser lens 11, an air inlet to introduce air from outside is prepared. The air is supplied by a compressor. Capacity of the compressor is desirable to achieve air pressure of 0.7 MPa or more and flow rate of 210 L/min or more. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for manufacturing an elastic member used for a paper mold for packaging and a die for corrugated cardboard, and a processing apparatus for the same.

  Conventionally, when punching a paper material or the like, a punching die is used. FIG. 6 is a schematic view of a conventionally used punching die 31. The die 31 is provided with a blade 37 and an elastic member 39.

  As shown in FIG. 6A, a workpiece 35 such as cardboard or cardboard is disposed on the receiving portion 33, and a blade 37 is provided at a cutting portion of the workpiece 35. An elastic member 39 is further provided around the blade 37. Normally, the thickness of the elastic member 39 is thicker than the protrusion margin of the blade 37 from the surface of the punching die 31. For this reason, the blade 37 is buried in the elastic member 39 at the normal time.

  Next, as shown in FIG. 6B, the punching die 31 is lowered toward the workpiece 35 (in the direction of arrow P in the figure). As the punch 31 is lowered, the elastic member 39 is pressed against the work 35 and deformed. Since the elastic member 39 is crushed, the blade 37 protrudes from the elastic member 39 and the workpiece 35 is cut.

  Next, the cutting die 31 is raised upward (in the direction of arrow Q in the figure), and the blade 37 is extracted from the work 35. At this time, the elastic member 39 tries to return to its original shape. Accordingly, the work 35 is pushed back downward by the elastic member 39. Therefore, the blade 37 is extracted from the work 35. The lowered workpiece 35 moves to a subsequent process. By using the elastic member 39, the blade 37 is reliably extracted from the work 35. For this reason, the movement of the workpiece | work 35 to a post process by the workpiece | work 35 being lifted in the state which stabbed at the blade 37 is not prevented.

  Such an elastic member 39 is manufactured for each die 31 and is attached to the die 31. By the way, since the elastic member 39 is made of a resin such as rubber, a water jet or the like is used when the elastic member 39 having a required shape is cut from a material. This is because, when the elastic member 39 is mechanically cut by a cutting machine or the like, it is difficult to cut the corner portion or the like, resulting in poor accuracy.

  Further, when the resin is laser processed, wrinkles are generated on the cut surface. For this reason, in the step shown in FIG. 6, the wrinkles fall on the work 35 and stain the surface of the work 35. The drop of the wrinkle on the work 35 adversely affects the subsequent printing process and the like, and therefore, an elastic member with wrinkles attached thereto cannot be used. For this reason, the elastic member 39 is generally cut by a water jet because of cutting accuracy and quality problems.

  However, in recent years, environmental problems have attracted attention, and waste liquid processing generated by cutting with a water jet has become a problem. In addition, the water jet is very expensive. Furthermore, according to the water jet, the elastic member can be cut without generating wrinkles, but in order to process an elastic member that has been subjected to special surface processing such as anti-slip, the surface is subjected to uneven processing in advance. Need to use special material. Such special materials are expensive and are used only for special purposes, and generally have not been used in many cases. This is because it was difficult to perform fine unevenness processing on the surface of the elastic member by the water jet.

  Based on such problems, there is a demand for a more efficient processing method that does not generate wrinkles and replaces a water jet (for example, Patent Document 1 and Patent Document 2 for laser processing).

Japanese Patent Laid-open No. 2000-14070 JP 2006-7280 A

  However, the laser processing described in Patent Document 1 and Patent Document 2 does not consider wrinkles generated during cutting. In the first place, it has been conventionally impossible to cut a resin with a laser without generating wrinkles, and as an elastic member for a punching die as in the present invention, wrinkles become a problem. No examples of laser processing have been reported so far.

  The present invention has been made in view of such problems, and is an elastic member capable of processing an elastic member for a punching die without generation of wrinkles by laser processing with excellent workability and no problems such as waste liquid. An object of the present invention is to provide a manufacturing method and a processing apparatus.

  In order to achieve the above-described object, the first invention oscillates laser light by a laser oscillation device, focuses the laser light by a condensing lens, and irradiates the elastic body with the laser light through a nozzle. A method of manufacturing an elastic member for a punching die that cuts the elastic body into a predetermined shape by injecting air through the nozzle in the irradiation direction of the laser light, wherein the pressure of the air is 0.7 MPa. The method for producing an elastic member for a punching die is characterized in that the flow rate of the air from the nozzle is 210 L / min or more.

  It is desirable that a focal length of the condensing lens is 1.5 inches to 2.5 inches, and an irradiation beam diameter of the laser light to the elastic body is 0.10 mm to 0.14 mm.

  It is desirable that a rectifying plate is provided above the air injection portion, and a tapered portion which is inclined upward toward the outer periphery is formed on the lower surface of the rectifying plate.

  The elastic body may be cut by the laser light and the air, and the surface of the elastic body may be subjected to uneven processing.

  The output of the laser oscillation device is desirably 18 W to 28.5 W. The elastic body may be sponge rubber.

  According to the first aspect of the invention, the air pressure and the air flow rate are significantly increased from the conventionally used conditions and are set to appropriate conditions, so that the resin-made elastic member is processed without generating wrinkles. be able to. In addition, there is no problem such as waste liquid treatment.

  In addition, by making the focal length and irradiation beam diameter of the condensing lens smaller than the conventional laser processing conditions, the elastic member can be processed while appropriately maintaining the shape of the cut surface of the elastic member.

  In addition, since air from the nozzle is rectified, the injected air and dust do not adhere to the equipment, etc., and turbulent flow does not occur in the processing space. Can flow.

  In addition, since it is possible to perform not only cutting but also surface processing of the elastic member with a laser, an elastic member having an uneven shape for preventing slip on the surface can be obtained without using a special material. For this reason, the elastic member which has arbitrary surface properties from one raw material can be manufactured in one manufacturing process.

  Moreover, by making the output of the laser oscillation device appropriate, generation of wrinkles can be suppressed more reliably and stable production can be performed.

  In addition, if the elastic member is sponge rubber, the same material as that of a conventionally used elastic member can be manufactured by laser processing, and wrinkles do not adhere to the elastic member.

  A second invention is an apparatus for processing an elastic member for a punching die, a laser oscillation device for emitting laser light, a head in which a condenser lens for condensing the laser light is attached, and a tip of the head A nozzle capable of supplying air therein, a compressor having an air pressure of 0.7 MPa or more and a flow rate of 210 L / min or more, and an air injection unit. And a rectifying plate having a tapered portion on the lower surface, wherein the air can be ejected from the tip of the nozzle toward the laser light irradiation direction. It is a processing device.

  According to the second aspect of the present invention, the resin-made elastic member can be processed with a laser without causing wrinkles. Further, it is possible to perform both cutting and surface processing of the elastic member with one apparatus. Moreover, since the air from the nozzle is rectified, the injected air and dust do not adhere to the equipment or the like, and turbulent flow does not occur in the machining space.

  According to the present invention, there is provided an elastic member manufacturing method and this processing apparatus capable of processing an elastic member for a punching die without generation of wrinkles by laser processing which is excellent in workability and has no problems such as waste liquid. be able to.

1 is a schematic diagram showing a configuration of an elastic member processing apparatus 1. It is a figure which shows the lens holders 17a and 17b holding the condensing lens 11, (a) is a top view, (b) is the FF sectional view taken on the line of (a). The figure which shows the baffle plate 24a. The figure which shows the elastic member 23. FIG. It is a figure which shows the cut surface of the elastic raw material 15, (a) is a figure which shows the state by which the cut surface was cut | disconnected straight, (b) is a figure which shows the state by which the cut surface was cut | disconnected in the shape of a tie, (c) The figure which shows the state in which the cut surface was cut | disconnected by reverse Tyco shape, (d) is a figure which shows the state in which the ridge 29 adhered to the cut surface. The figure which shows the process in which the elastic member 39 is provided in the cutting die 31, and the workpiece | work 35 is cut | disconnected by the cutting die 31. FIG.

  An embodiment of the present invention will be described. As described above, when an elastic member is manufactured by ordinary laser processing, generation of wrinkles is inevitable. In addition, the water jet has a problem of waste liquid, and the mechanical cutting machine or the like has problems in processing accuracy, corner processing, and the like. For this reason, it is necessary to find a processing method that does not generate soot, does not generate waste liquid, and is excellent in processing accuracy, processing efficiency, and the like.

  The inventors of the present invention have made extensive efforts to study the production method and production conditions from various viewpoints in order to achieve the above-mentioned problems, and as a result, have obtained the following knowledge. That is, it has been found that even with the laser processing method, generation of soot can be suppressed by significantly increasing the conventional air pressure and air amount.

  In other words, in conventional laser processing, an object is cut with laser light, and cooling air or the like has been used accompanying this. However, when resin or the like is cut with laser light, a carbonized layer is formed around the cut portion. As a result, wrinkles occur. On the other hand, by injecting a large amount of air onto the object while making a slight incision into the object with a fine laser light, the cutting progresses while the incision by the laser light is spread by the air. Has been found to be suppressed.

  Hereinafter, the elastic member processing apparatus 1 according to the embodiment of the present invention will be described in detail. FIG. 1 is a schematic diagram showing an elastic member processing apparatus 1 according to the present invention.

  The elastic member processing apparatus 1 mainly includes a laser oscillation device 3, a processing head 5, which is a unit that irradiates an elastic material 15 with laser light, a nozzle 7, and the like. The laser oscillation device 3 is a laser beam oscillation device, and for example, a carbon dioxide laser oscillator can be used.

  In addition, if the capability of the laser oscillator is too strong, it becomes difficult to reduce the irradiation diameter of the laser light, and wrinkles are likely to occur. Therefore, the capacity of the laser oscillator is desirably 30 W or less, and a particularly desirable processing output range is 18 to 28.5 W. This is because if the laser beam is too strong, the carbonized layer becomes thick when the cut is made in the resin, so that wrinkles may occur. If it is too weak, the surface cannot be cut.

  The processing head 5 is provided with a reflector 9 inside. The reflection plate 9 is a part that reflects the laser light toward the condenser lens 11. A condensing lens 11 that squeezes the laser light from the reflector 9 is provided in the processing head 5. The condensing lens 11 can focus on a predetermined condensing distance. That is, the laser light reflected from the reflecting lens 9 enters the condenser lens 11 and is focused most at a position below the focal length of the condenser lens 11. The laser beam irradiation diameter at this focal length is referred to as a beam diameter (or beam mode).

  Here, the focal length of the condenser lens 11 is preferably 1.5 to 2.5 inches. If the focal length of the condensing lens 11 becomes too short, the cut portion will be a tie shape. Moreover, it is because a cutting | disconnection part will become reverse Tyco shape when a focal distance is made too long. The shape of the cutting part will be described later.

  Below the condenser lens 11, an air supply port through which air can be introduced from the outside is provided obliquely toward the nozzle. Air is supplied by a compressor. It is desirable that the compressor has an air pressure of 0.7 MPa or more and is capable of generating a flow rate of 210 L / min or more from the nozzle, more preferably an air pressure of 0.75 MPa or more and an air flow rate of 250 L / min or more. Is desirable. For example, a compressor of 2.2 kW class or higher may be used as the compressor. An inert gas or the like can be used instead of air.

  A cylindrical nozzle 7 is connected below the processing head 5. A hole is provided at the tip of the nozzle 7. The nozzle 7 is a part for injecting laser light and air to a processing part of the processing object. The processing head 5 and the nozzle 7 can be moved in the X, Y, and Z directions on the elastic material 15 to be processed by a motor or the like (not shown). A rectifying plate 24 a is provided on the outer periphery of the nozzle 7. The rectifying plate 24a will be described later.

  Next, operation | movement of the elastic member processing apparatus 1 is demonstrated. First, the laser oscillation device 3 oscillates laser light with respect to the reflection plate 9 (in the direction of arrow A in the figure). The laser light applied to the reflecting plate 9 is reflected by the reflecting plate 9 and applied to the condenser lens 11 in the processing head 5 (in the direction of arrow B in the figure). The laser light condensed by the condenser lens 11 passes through the nozzle 7 and is irradiated to the elastic material 15 below the tip of the nozzle 7 (in the direction of arrow C in the figure).

  On the other hand, air is introduced into the machining head 5 from the air supply port 13 (in the direction of arrow D in the figure). Air is jetted downward together with the laser beam through the hole of the nozzle 7 (in the direction of arrow E in the figure). Below the nozzle 7, an elastic material 15 to be processed is disposed with a gap. Therefore, laser light and air are irradiated and jetted onto the processing target portion of the elastic body material 15.

  Here, the distance L from the condenser lens 11 to the surface of the elastic material 15 to be processed is a focal length corresponding to the condenser lens 11 described above. For example, if the condensing lens 11 having a focal length of 2 inches is used, L is 2 inches. When changing the focal length, the nozzle 7 is exchanged together with the condenser lens. That is, the length M of the nozzle 7 is set according to the focal length of the condenser lens 11.

  The distance from the tip of the nozzle 7 to the elastic material 15 is preferably about 0.5 to 0.7 mm. This is to prevent contact between the tip of the nozzle 7 and the elastic material 15 and to efficiently inject the supplied air to the elastic material 15. Moreover, the hole diameter of the nozzle tip is, for example, about 3.5 to 4.5 mm. If the hole diameter at the nozzle tip is too small, the flow loss increases and the air pressure increases, but the generation of soot cannot be suppressed. For example, if the nozzle tip diameter is 1 mm, an air pressure of 1.0 MPa can be secured, but the air flow rate is 1/3 or less of a nozzle having a diameter of 4.2 mm, so the air flow rate is insufficient. Moreover, if the hole diameter at the nozzle tip is too large (for example, 4.5 mm or more), the air is not concentrated on the cut portion of the elastic material, and the cutting efficiency by the air deteriorates.

  Next, a method for attaching the condenser lens 11 will be described. 2A and 2B are views showing the condenser lens 11 and lens holders 17a and 17b for holding the condenser lens. FIG. 2A is a plan view, and FIG. 2B is a cross-sectional view taken along line FF in FIG. FIG.

  The condenser lens 11 is held by lens holders 17 a and 17 b provided in the processing head 5. The lens holder 17a is a rectangular plate-like member having a hole in the center. A pair of claws 23 is formed in the hole of the plate member. The nail | claw 23 protrudes in the hole side from the both sides of the hole of the lens holder 17a, and the front-end | tip of the protruded part is bent substantially perpendicularly | vertically. The lens holder 17b has a hole having a diameter substantially the same as that of the condensing lens 11 at the center, and a holding portion 23b for preventing the condensing lens 11 from dropping off. The holding part 23b is a part protruding to the hole side of the lens holder 17b.

  The condenser lens 11 is held from above and below by the claws 23a and the holding portion 23b. The lens holders 17 a and 17 b are internally threaded, and the upper and lower plate members are fixed by bolts 19 and washers 21. That is, the condenser lens 11 is housed in the holes of the lens holders 17a and 17b, held by the upper and lower claws 23a and the holding portion 23b, and fixed by being sandwiched by the bolts 19 and the like by the lens holders 17a and 17b. .

  Since air with a large pressure is supplied into the machining head 5, a locking agent is applied to the screwed portion between the bolt 19 and the female threaded portion of the lens holder 17a, 17b as a locking of the bolt 19. It is desirable. Further, the periphery of the mounting portion of the condenser lens 11 is sealed with urethane rubber or the like, so that air flowing in from the air supply port 13 (FIG. 1) does not leak above the condenser lens 11.

  Next, the structure near the tip of the nozzle 7 will be described. FIG. 3A is a view showing a state in which the rectifying plate 24 a is provided in the nozzle 7. A rectifying plate 24 a is provided above the air injection portion at the tip of the nozzle 7. The rectifying plate 24 a is a plate-like member provided on the nozzle 7 in a flange shape. The thickness of the rectifying plate 24a is reduced toward the outer periphery, and a tapered portion 26 that is inclined upward is formed on the lower surface of the rectifying plate 24a.

  In the processing method of the present invention, an extremely large volume of air is blown. For this reason, the injected air collides with the elastic material 15 and is wound upward. If the rectifying plate 24a of the present invention is used, the air that has collided with the elastic material 15 and flew upwards is smoothly released to the surroundings (in the direction of arrow G in the figure). For this reason, the dust generated in the processing portion does not enter the equipment and the like, and the condenser lens and the like are not contaminated, and the dust does not fly in the processing space. Note that an air suction unit connected to the blower is provided above the device and below the elastic body material, and the injected air, dust, and the like are sucked from the air suction unit. According to the rectifying plate 24a, the air flow is rectified, so that the suction effect is enhanced.

  On the other hand, if the preparation shown in FIG. 3B and the current plate 24a are not used, it collides with the elastic material 15 and the air and dust wound upward enter the device (arrows in the figure). H direction), which is not desirable.

  Further, in the flat rectifying plate 24b not provided with the taper portion, when a large volume of air collides with the rectifying plate 24b, the air returns downward (in the direction of arrow J in the figure), generating turbulent flow in the machining space, Undesirable because it raises dust. The rectifying plate 24a may be, for example, an outer diameter of about 30 to 40 mm, an outer peripheral thickness of 1 mm, and a contact portion thickness with the nozzle 7 of about 5 mm.

  Next, the elastic member 30 processed by the elastic member processing apparatus 1 will be described. 4A and 4B are diagrams showing the elastic member 30, in which FIG. 4A is a plan view and FIG. 4B is a perspective view. The elastic member 30 is processed from the elastic body material 15 by the elastic member processing apparatus 1. A side surface of the elastic member 30 is a cut surface 25. The member surface 27 which is the upper surface of the elastic member 30 is subjected to uneven processing as necessary. Concavity and convexity processing is for preventing slippage with a workpiece when used in a punching die. The unevenness may be about 10 to 20 μm deep.

  According to the elastic member processing apparatus 1, the cutting of the elastic material 15 and the surface processing of the member surface 27 can be performed by the same apparatus and in the same process. That is, the cutting surface 25 can cut the elastic member 15 by lowering the feed speed (machining speed) of the machining head and the like, and the member surface 27 can be processed only by increasing the feed speed. There is no wrinkle in any processing.

  As the elastic material 15, for example, sponge rubber such as styrene butadiene rubber can be used. Any material may be used as long as it is not chlorine-based or the like that generates toxic gas by laser.

  Next, details of the cut surface 25 of the elastic material 15 will be described. FIG. 5 is a view showing the form of the cut surface 25.

  As shown in FIG. 5A, the most desirable cut surface 25 is a cut surface that is substantially perpendicular to the surface of the elastic material 15, and has a form in which wrinkles or the like are not generated on the surface of the cut surface 15. . According to the elastic member manufacturing apparatus 1 according to the present invention, a cut surface 25 as shown in FIG. 5A can be obtained.

  On the other hand, FIG. 5B shows a state where the cut surface 25 is shaped like a tie. This is a form mainly generated when the focal length of the laser beam is too short. Similarly, FIG.5 (c) is a figure where the cut surface 25 shows a reverse Tyco shape. A reverse Tyco-shaped cut surface is likely to occur when the focal length of the laser beam is too long. In addition, if there is no restriction | limiting in particular in the shape of a cut surface according to a product, the thing of FIG.5 (b) and FIG.5 (c) can also be used.

  FIG. 5D is a diagram illustrating a state in which wrinkles are generated on the cut surface 25. When wrinkles occur on the cut surface 25, the member can no longer be used for a punching die or the like. According to the elastic member processing apparatus 1 of the present invention, the occurrence of such wrinkles can be suppressed.

  The elastic member was processed under various conditions, and the occurrence of wrinkles at that time was investigated. The laser oscillator used had a capacity of 30 W, and the machining output was adjusted to 28.5 W or less. Further, styrene-butadiene sponge rubber was used as the elastic material to be processed. The results are shown in Table 1.

  The focal length of the condenser lens was 1.0 to 4.0 inches. The nozzle length was adjusted according to the focal length so that the gap between the nozzle tip and the workpiece was 0.5 to 0.7 mm. The air pressure and the air flow rate from the nozzle are 0.3 MPa and 30 L / min (test No. 11), which are conventionally used in a conventional 30 W class laser oscillator, and 0.6 MPa to 1.0 MPa, 160 L / min. Evaluated for min-320 L / min. The beam mode is a beam diameter irradiated on the workpiece, and was evaluated in a range of 0.10 mm to 0.15 mm. A compressor of 2.2 kw was used, and a hose was connected between the compressor and the processing machine via a regulator. The hose was about 2 m from the regulator, and had an outer diameter of 6 mm and an inner diameter of 4 mm. The air pressure was adjusted to each pressure with a regulator. The air flow rate is an air flow rate from the nozzle tip under various conditions.

  The cut shape is X when the shape of the cut surface is completely Tyco or inverted Tyco, X is slightly Tyco or inverted Tyco, and ○ is a substantially vertical cut surface. It was. The occurrence of wrinkles was evaluated as x when the occurrence of wrinkles was clearly confirmed by visual inspection, as Δ when it was slightly seen but usable, and as ○ when no wrinkle was seen.

  As can be seen from Table 1, test No. which is the conventional air pressure and air flow rate. No. 11 was completely wrinkled. In addition, test No. 1 in which the air pressure was about doubled and the air flow rate was over 5 times. No wrinkles occurred at 6.

  On the other hand, test no. In contrast to Test No. 6, only the air pressure and air flow rate were further increased. No. 7 is a test No. 7 in which the generation of soot was considerably suppressed and the air pressure and the air flow rate were further increased. In 8-10, no generation of wrinkles was observed. In other words, the generation of soot is suppressed when the air pressure is 0.7 MPa or more and the air flow rate is 210 L / min or more, and if the air pressure is 0.75 MPa or more and the air flow rate is 230 L / min or more, the generation of soot is almost certainly suppressed. It was.

  Test No. 4, no. In No. 5, the generation of soot was slightly observed even though the air pressure was 0.8 MPa and the air flow rate was 250 L / min. This is because the beam mode is increased by increasing the focal length of the condenser lens. When the beam mode (irradiation beam diameter) increases, the thickness of the carbonized layer on the cut surface increases and wrinkles are likely to occur.

  Although the results were omitted, when a laser oscillation device having a capacity of 50 W or more was used and the machining output was similarly reduced to 28.5 W or less, generation of wrinkles was observed even if the air pressure was increased. This is because the laser beam from the laser oscillator having a large capacity cannot be narrowed down by the condenser lens, and the beam diameter becomes large (0.15 mm or more). Therefore, in order to suppress the generation of wrinkles, the beam diameter is desirably 0.14 mm or less, and more desirably 0.13 mm or less. For this purpose, it is desirable to reduce the capacity of the laser oscillator itself. For example, this condition can be satisfied by using a laser oscillator having a capacity of 30 W or less and optimizing the focal length.

  Similarly, regarding the result of the cut shape, test No. 1 in which the focal length of the condenser lens is 1 inch. In No. 1, the cut shape was a Tyco shape. Test No. with a focal length of 1.5 inches. In No. 2, the Tyco shape is almost eliminated and the focal length is 2 inches. In No. 3, a substantially vertical cut surface was obtained.

  On the other hand, test No. with a focal length of 2.5 inches. In Test No. 4, the cut surface was slightly inverted, and the focal length was 3 inches. In No. 5, it became a complete inverted Tyco cross section. As described above, the focal length is preferably 1.5 to 2.5 inches, and the focal length of about 2 inches is particularly excellent in cutting shape.

  In addition, although a result is abbreviate | omitted, using a 30-W laser oscillator, a focal distance of 2 inches (beam diameter of 0.13 mm), an air pressure of 0.8 to 0.9 MPa, and an air flow rate of 250 to 280 L / min, When various materials were cut, no flaws were found on any of the cut surfaces.

  For example, a styrene-butadiene sponge rubber having a hardness of 20 to 40 and a thickness of 7 to 12 mm can be adjusted by adjusting the processing output within a range of 21 to 28.5 W according to the hardness and thickness and selecting an appropriate processing speed. It was possible to process without generating. Also, polyurethane foam rubber (trade name VALCORAN) having a hardness of 35 to 70 and a thickness of 7 mm can be processed without wrinkles due to a processing output of 18 to 21 W. The above-mentioned hardness is according to JIS K6253.

  As described above, according to the present invention, it is possible to provide a method for processing an elastic member that is free from waste liquid treatment and has excellent processing accuracy and processing efficiency.

  In particular, since the air pressure and the air flow rate are increased several times as compared with the conventional method used for cooling or the like, no soot is generated. Here, conventionally, a compressor having a capacity as small as possible has been used. This is because the use of an unnecessarily large compressor leads to an increase in running costs and an increase in the size of the device, and there is a risk of an increase in noise, insufficient strength of the equipment, and displacement of the elastic material. . Conventionally, the air used for laser processing only needs to cool the processed part and blow out fine dust. In a laser processing machine of about 30 W, it was typically about 0.3 MPa and about 30 L / min.

  In the present invention, the air pressure and the air amount are increased not only to cool the processed part, but also to the extent that it can directly contribute to cutting, so the generation of wrinkles is achieved by the effect of cutting with laser and cutting with air (and laser). It is possible to suppress to the limit. For this reason, it is necessary to supply an extremely large volume of air that is twice or more the air pressure and seven times or more the air flow rate.

  Further, since the capacity of the laser oscillator is set to 30 W or less, the beam mode can be set to 0.14 mm or less depending on the focal length. This is because a laser oscillator exceeding 30 W has a beam diameter of 0.15 mm or more when a normal condenser lens is used. On the other hand, when a laser oscillator of 30 W or less is used, the beam diameter can be reduced to 0.14 mm or less by setting the focal length of the condenser lens to 2.5 inches or less. By making the beam diameter smaller, the generation thickness of the carbonized layer can be suppressed. Therefore, generation | occurrence | production of soot is suppressed more.

  In addition, even for such a large volume of air, since the rectifying plate 24a having the tapered portion 26 is provided on the lower surface, the flow of air is rectified, so that dust or the like rises in the processing space. Adhesion to the device is suppressed, and the jet air can be efficiently sucked.

  That is, the present invention is a combination of a low-capacity laser oscillator of 30 W or less, an air pressure of 0.7 MPa or more, and an air flow of 210 L / min or more, which has not been studied at all. By satisfying the above condition, the elastic member for the punching die can be processed using a laser processing machine without generating wrinkles. The air condition in the present invention is not a conventional air blow such as cooling, but is an essential configuration for advancing cutting while spreading a fine cut by a laser. That is, the cutting in the present invention is completely different from the cutting principle in which cutting is performed while completely melting the local portion of the material in the depth direction as in simple laser processing.

  The present invention does not appropriately set the processing conditions of a conventional laser processing machine, but is based on knowledge obtained by the inventors as a result of trial and error over 20 years. As described above, in the field of laser processing, it has become common sense that wrinkles are produced when rubber is processed with a laser processing machine, and trying to laser process rubber is contrary to common sense. The inventor has doubts about this common sense, and as a result of repeated trial and error for 20 years, the inventors succeeded in cutting rubber without generating wrinkles with a laser processing machine.

  In the application invention, even if the substance itself is already known, it is patented if a new application is found. The present invention is also the same. That is, the laser processing machine itself is known, but as a result of repeated trial and error over 20 years of various laser processing conditions, the rubber could be cut without generating wrinkles.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

DESCRIPTION OF SYMBOLS 1 ......... Elastic member processing apparatus 3 ......... Laser oscillation apparatus 5 ......... Processing head 7 ......... Nozzle 9 ......... Reflector 11 ......... Condensing lens 13 ......... Air supply port 15 ......... Elastic body material 17a, 17b ......... Lens holder 19 ......... Bolt 21 ......... Washer 23a ......... Nail 23b ......... Holding part 24a, 24b ......... Rectifying plate 25 ......... Cut surface 26 ......... Tapered portion 27... Member surface 29... 煤 30... Elastic member 31... Punching die 33.

Claims (7)

Laser light is oscillated by the laser oscillation device,
The laser beam is focused by a condenser lens,
While irradiating the elastic body made of resin through the nozzle with the laser light, by ejecting air through the nozzle in the irradiation direction of the laser light, the die for cutting the elastic body into a predetermined shape A method for producing an elastic member, comprising:
A method for producing an elastic member for a punching die, wherein the pressure of the air is 0.7 MPa or more, and the flow rate of the air from the nozzle is 210 L / min or more. The focal length of the condenser lens is 1.5 inches to 2.5 inches,
2. The method for producing an elastic member for a punching die according to claim 1, wherein an irradiation beam diameter of the laser beam to the elastic body is 0.10 mm to 0.14 mm.   3. The punch according to claim 1, wherein a rectifying plate is provided above the air injection portion, and a tapered portion that is inclined upward toward the outer periphery is formed on the lower surface of the rectifying plate. A method for producing an elastic member for a mold.   The elastic member for a punching die according to any one of claims 1 to 3, wherein the elastic body is cut by the laser light and the air, and the surface of the elastic body is subjected to uneven processing. Production method.   The method for producing an elastic member for a punching die according to any one of claims 1 to 4, wherein the output of the laser oscillation device is 18W to 28.5W.   The method for manufacturing an elastic member for a punching die according to any one of claims 1 to 5, wherein the elastic body is sponge rubber. An apparatus for processing an elastic member for a punching die,
A laser oscillation device that emits laser light;
A head to which a condensing lens for condensing the laser light is attached;
A nozzle provided at the tip of the head and capable of supplying air therein;
A compressor in which the pressure of the air is 0.7 MPa or more and the flow rate of the air is 210 L / min or more;
A rectifying plate provided above the air injection portion and having a tapered portion on the lower surface;
Comprising
An apparatus for processing an elastic member for a punching die, characterized in that the air can be ejected from the tip of the nozzle in an irradiation direction of the laser beam.

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