JP6107128B2 - Measuring method and apparatus for geometric tolerance of cylindrical container - Google Patents

Description

  The present invention relates to a geometric tolerance measuring method and measuring apparatus for a cylindrical container.

  Cylindrical containers are frequently used as basic parts for a wide variety of applications, and high accuracy is required for the accuracy of the outer shape and geometrical tolerance when a specific part of the cylindrical container is used as a datum. As such an accuracy measurement method, it has been proposed to measure the runout of the outer peripheral surface of a cylindrical substrate for an electrophotographic tourist body, which is an aspect of a cylindrical container, while rotating the cylindrical substrate (for example, Patent Document 1).

JP 2006-251233 A

  By the way, in the case of a cylindrical substrate for an electrophotographic tourist body, in order to form an electrostatic latent image on the cylindrical surface, the cylindrical surface is required to have high smoothness in addition to small bending and misalignment. For this reason, even if the cylindrical substrate is rotated by receiving it with a bearing or a V-shaped bevel, the smoothness of the surface of the cylindrical substrate does not significantly affect the axial blurring during the rotation. On the other hand, in some types of cylindrical containers, the geometrical tolerance between components may be more important than the smoothness of the cylindrical surface. For example, a high-pressure gas tank for storing high-pressure gas includes a cylindrical tank body member and a cylindrical end small-diameter member extending from the end thereof, and is provided at a predetermined position in a fuel cell-equipped vehicle or a fuel cell power plant. Installed. The installed high-pressure gas tank is connected to a pipe to the fuel cell in a cylindrical end small-diameter member. Since this piping forms a high-pressure gas path, the piping has high rigidity, and the position freedom of the connection port at the end of the piping is not so high. Therefore, when the geometrical tolerance between the tank body member and the cylindrical end small-diameter member is not within a predetermined range in a state where the high-pressure gas tank is already installed, the pipe connection in the cylindrical end small-diameter member is hindered. Connection work becomes complicated. If the method proposed in the above patent document is applied to such a cylindrical container typified by a high-pressure gas tank, axial blurring occurs during rotation due to the degree of smoothness of the cylindrical surface. There is a concern that the measurement accuracy of the geometric tolerance of the cylindrical end small-diameter member used as the datum is lowered. For these reasons, it has been required to improve the measurement accuracy of the geometric tolerance of a cylindrical container including a cylindrical body member and a cylindrical end small-diameter member extending from the end thereof. In addition, cost reduction, resource saving and simplification of measuring the geometric tolerance of the cylindrical container, and downsizing of the measuring apparatus have been desired.

SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms.
A method of measuring a geometric tolerance of a cylindrical container having a cylindrical body member and a cylindrical end small-diameter member extending from an end of the member,
Holding the cylindrical container on the outer periphery of the body member (1);
A measuring device that can rotate about the axis of the rotating shaft is held by aligning the rotating axis with the central axis of the held body member, and the measuring device that has been held is rotated about the axis of the rotating shaft. Step (2).

  (1) According to one form of this invention, the geometric tolerance measuring method of a cylindrical container is provided. This method of measuring the geometric tolerance of a cylindrical container is to measure the geometric tolerance of a cylindrical container having a cylindrical body member and a cylindrical end small-diameter member extending from the end of the cylindrical container. A step (1) of holding the outer periphery of the member, and a step of rotating the measurement device that has been held so as to be rotatable around the central axis of the held body member (2). With. In the geometric tolerance measuring method of the cylindrical container of this embodiment, the end small-diameter member whose datum is the outer periphery of the holding portion of the body member, and eventually the center axis of the body member determined by this outer periphery, by rotation around the center axis of the measuring device. Can be measured by the measuring function of the measuring device. And in the geometric tolerance measuring method of the cylindrical container of said form, in measuring a geometric tolerance, a cylindrical container should just be hold | maintained on the outer periphery of the trunk | drum member, and a cylindrical container is not rotated. As a result, according to the geometric tolerance measuring method of the cylindrical container of the above-described form, the influence of the smoothness degree of the cylindrical surface can be excluded from the measurement accuracy of the geometric tolerance, and the measurement accuracy can be increased correspondingly. Further, since the cylindrical container that tends to have a large outer shell is not rotated, the container rotating device and its drive source are not required, and the device configuration can be simplified and miniaturized, and the measurement cost can be reduced.

  (2) In the geometric tolerance measuring method of the cylindrical container of the above aspect, in the step (1), a jig having an arc-shaped holding portion formed by a perfect circular arc defined by a design radius of the body member. It is possible to hold the body member by gripping the outer periphery of the body member with the arc-shaped holding part of the jig. In this way, the outer periphery of the body member is gripped by the arcuate holding portion of the perfect circular arc, so that the outer periphery of the body member gripping portion, and thus the center axis of the body member determined by this outer periphery is more accurately determined. The accuracy of measuring the geometric tolerance of the end small-diameter member is also increased.

  (3) According to the other form of this invention, the geometrical tolerance measuring apparatus of a cylindrical container is provided. This cylindrical container geometrical tolerance measuring apparatus is a cylindrical container geometrical tolerance measuring apparatus having a cylindrical body member and a cylindrical end small-diameter member extending from the end of the cylindrical body member, and is installed on the apparatus base. Measure the distance between the jig for holding the cylindrical container on the outer periphery of the body member and the end small-diameter member extending from the end of the body member along the central axis of the held body member And a device holding unit that is installed on the apparatus gantry and holds the measuring device rotatably about the central axis of the held body member. And the jig has an arc-shaped holding portion formed by a circular arc defined by the design radius of the body member, and grips the outer periphery of the body member by the arc-shaped holding portion, The body member is held. The cylindrical container geometric tolerance measuring apparatus of the above form is configured to rotate the measuring device held around the central axis of the body member by the device holding unit, and rotate the measuring device around the central axis to grip the body member by the arc-shaped holding unit. The geometrical tolerance of the end small-diameter member having the datum as the center axis of the body member determined by the outer periphery and the outer periphery determined at this outer periphery is measured. And in the geometric tolerance measuring apparatus of the cylindrical container of said form, in measuring a geometric tolerance, a cylindrical container should just be hold | gripped with an arc-shaped holding part in the outer periphery of the trunk | drum member, and a cylindrical container is not rotated. In addition, the outer periphery of the body member is gripped by the arcuate holding portion having a perfect circular arc, so that the outer periphery of the body member at the gripped portion, and thus the center axis of the body member determined by the outer periphery can be more accurately defined. As a result, according to the geometric tolerance measuring apparatus for a cylindrical container having the above-described form, the influence of the smoothness of the cylindrical surface can be eliminated from the measurement accuracy of the geometric tolerance, and the measurement accuracy can be increased accordingly. Further, since the cylindrical container that tends to have a large outer shell is not rotated, the container rotating device and its drive source are not required, and the device configuration can be simplified and miniaturized, and the measurement cost can be reduced.

  (4) In the geometric tolerance measuring apparatus for a cylindrical container according to the above aspect, the jig is configured such that the arc-shaped holding portion is formed by a perfect circular arc defined by a radius exceeding the designed radius. Thus, the surface of the arc-shaped holding part can be provided with a concave-convex absorbing member having a thickness and elasticity corresponding to the difference between the radius exceeding the design radius and the design radius. In this way, since the outer periphery of the body member is gripped by the arc-shaped holding portion with the unevenness absorbing member interposed, even if unevenness is present on the outer peripheral surface of the body member, the unevenness is caused by the elastic unevenness absorbing member. Absorbed. Therefore, according to the geometric tolerance measuring apparatus of the cylindrical container of this embodiment, the outer periphery of the body member gripped by the arc-shaped holding portion, and the center axis of the body member determined by this outer periphery is the surface of the outer surface of the body member. Since it is determined accurately regardless of the unevenness, the measurement accuracy of the geometric tolerance of the end small-diameter member using these as datum is also increased.

  (5) In the geometric tolerance measuring apparatus for a cylindrical container of the above aspect, the unevenness absorbing member is formed by undergoing hardness adjustment such that the hardness increases as the weight of the cylindrical container to be measured increases. In this way, the outer periphery of the gripping portion of the body member due to the weight of the cylindrical container, and thus the displacement of the center axis of the body member determined by this outer periphery can be suppressed, so that the influence of the weight can be suppressed or avoided, and the end small diameter member It becomes possible to increase the measurement accuracy of the geometric tolerance of the.

  The present invention can be applied to a cylindrical container manufacturing method or a manufacturing apparatus as determination of a non-defective product or a defective product of a cylindrical container based on a measurement result of geometric tolerance obtained in the above-described form.

It is explanatory drawing which shows a schematic structure typically by seeing the geometrical tolerance measuring apparatus 100 of 1st Embodiment by a front view and a side view. It is explanatory drawing which shows the aspect of retraction | saving of an upper clamp. It is explanatory drawing which shows the mode of the datum prescription | regulation used as the reference | standard which prescribes | regulates the external shape and geometric tolerance of the high pressure gas tank Wt. It is explanatory drawing which shows a response | compatibility with a datum and a tank holding location on the assumption of the surface unevenness | corrugation which prescribes | regulates the smoothness of the outer peripheral surface of the high pressure gas tank Wt. It is explanatory drawing which shows typically schematic structure by having 100A of geometric tolerance measuring apparatuses of other embodiment seen from a front view and a side view. It is explanatory drawing which shows an example of the mode of mounting of the spacer 150, and the form of the spacer which can be taken. It is explanatory drawing which shows typically a schematic structure by seeing the geometrical tolerance measuring apparatus 200 of another embodiment from the front. It is explanatory drawing which shows the mode of a tank holding | maintenance after seeing the geometrical tolerance measuring apparatus 200 from the side. It is explanatory drawing which shows typically schematic structure by seeing the side view of the geometrical tolerance measuring apparatus 100B of other embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram schematically showing a schematic configuration of a geometric tolerance measuring apparatus 100 according to the first embodiment when viewed from the front and side.

  As shown in the figure, the geometric tolerance measuring apparatus 100 includes an apparatus base 102, a first upper clamp 110, a first under clamp 112, a second upper clamp 120, a second under clamp 122, and a measurement mechanism unit 130. Is provided. The first upper clamp 110 and the first under clamp 112 are paired to hold the high-pressure gas tank Wt up and down. Both of these clamps have a perfect circular arc defined by a design radius rs of a high-pressure gas tank Wt, which will be described later, more specifically, a tank holding arcuate surface Sb that is a semicircular arc. The first upper clamp 110 and the first under clamp 112 form a perfect circle with a design radius rs over the entire circumference by joining the joining upper surface Sbu and the joining lower surface Sbd, and the true radius of the design radius rs. A circular tank holding arcuate surface Sb grips the outer periphery of the cylinder portion Wts of the high-pressure gas tank Wt to hold the tank. The same applies to the second upper clamp 120 and the second under clamp 122.

  The first upper clamp 110 and the second upper clamp 120 are retracted so as to be positioned with respect to the corresponding under clamp. FIG. 2 is an explanatory view showing a mode of retracting the upper clamp. As shown in the drawing, the first and second upper clamps are configured to be retracted upward with respect to the corresponding under clamps, or configured to be pivoted and retracted with respect to the corresponding under clamps. In any configuration, the first and second upper clamps are positioned using a reference pin, a diamond pin or the like (not shown), and the joining lower surface Sbd is joined to the joining upper surface Sbu of the corresponding under clamp. Then, as described above, a perfect circle having the design radius rs is formed, and the outer periphery of the cylinder portion Wts of the high-pressure gas tank Wt is gripped.

  The high pressure gas tank Wt gripped in this way will be described. FIG. 3 is an explanatory diagram showing a datum regulation as a standard for defining the outer shape and geometric tolerance of the high-pressure gas tank Wt, and FIG. 4 is based on the assumption of surface irregularities that define the smoothness of the outer peripheral surface of the high-pressure gas tank Wt. It is explanatory drawing which shows a response | compatibility with a datum and a tank holding location.

  As shown in FIG. 3, the high-pressure gas tank Wt is a cylindrical container in which a convex curved dome portion Wtd is joined to both ends of a cylindrical cylinder portion Wts, and has a base Wtk on the top of the dome portion Wtd. The base Wtk is a circular shaft member that extends from both ends of the high-pressure gas tank Wt and has a smaller diameter than the cylinder portion Wts, and at least one of them has a gas flow passage inside.

  The high-pressure gas tank Wt having such a configuration is a FRP (Fiber Reinforced Plastics) tank in which a hollow resin liner having a gas barrier property is coated with carbon fiber reinforced plastic or glass fiber reinforced plastic, and is used for filament winding ( Hereinafter, it is manufactured by the FW method). In this FW method, fibers impregnated with a thermosetting resin such as an epoxy resin are repeatedly wound around the outer periphery of a hollow resin liner to form a fiber reinforced resin layer on the liner, and then the thermosetting resin contained in the resin layer is formed. Heat cure. The high-pressure gas tank Wt has a fiber-reinforced resin layer after thermosetting as an outer shell, and its outer dimension is set as a design radius rs at the time of tank design. The degree is specified. On the other hand, when the high-pressure gas tank Wt is mounted on a fuel cell-equipped vehicle (not shown), the high-pressure gas tank Wt is installed on a mounting base (not shown) at two locations of the cylinder portion Wts, and is connected to a gas pipe at the base Wtk.

  For this reason, the high pressure gas tank Wt has a tank center axis CL determined by the outer periphery of the cylinder portion Wts at the first outer peripheral contact point A and the second outer peripheral contact point B in contact with the installation base as a datum. The coaxiality of the base Wtk with respect to is required within a predetermined range. In this case, the thermosetting resin is extruded to the outer peripheral side of the tank by the winding of the reinforcing fiber by the FW method and is thermoset, and the extrusion state and the thermosetting state are not uniform in the cylinder portion Wts. Therefore, irregularities occur on the outer periphery of the cylinder portion Wts in the high-pressure gas tank Wt. The geometric tolerance measuring apparatus 100 of this embodiment measures the coaxiality of the base Wtk with respect to the tank center axis CL in consideration of such unevenness. For this measurement, the first upper clamp 110 and the first under clamp 112, the second upper clamp 120 and the second under clamp 122, and the measurement mechanism unit 130 described above are used. The first upper clamp 110, the first under clamp 112, the second upper clamp 120, and the second under clamp 122 are a first outer peripheral contact point A and a second outer peripheral contact point B where the high pressure gas tank Wt contacts the installation base. Is held by the perfectly circular tank holding arcuate surface Sb having the design radius rs to hold the high-pressure gas tank Wt.

  The measurement mechanism unit 130 includes a holding arm 131, a motor 132, and a digital gauge 140 as a measurement device. The holding arm 131 is rotatably incorporated with respect to a leg 114 erected on the apparatus base 102, and rotates by receiving the driving force of the motor 132. The holding arm 131 may be rotated by a handle operation without using the motor 132. The holding arm 131 has a rotational axis DCL that coincides with the central axis of the tank holding arcuate surface Sb of the first upper clamp 110, the first under clamp 112, and the second upper clamp 120, the second under clamp 122. Built into the legs 114.

  The digital gauge 140 is attached to the tip of the holding arm 131 such that the contact is in contact with the outer periphery of the base Wtk. The digital gauge 140 rotates around the axis of the rotation axis DCL, which is the central axis of the tank holding arcuate surface Sb, with the rotation of the holding arm 131 while the contact is in contact with the outer periphery of the base Wtk. The displacement of the contact is output as a detection value. The digital gauge 140 may be an analog dial gauge.

  Next, the coaxiality measurement of the base Wtk with respect to the tank center axis CL by the geometric tolerance measuring apparatus 100 described above will be described. First, in preparation for mounting of the high-pressure gas tank Wt, the first upper clamp 110 and the second upper clamp 120 are retracted as shown in FIG. Next, the high-pressure gas tank Wt is placed on the first under clamp 112 and the second under clamp 122 by a transfer device (not shown). At this time, the transport device transports the high-pressure gas tank Wt so as to be held by the first under clamp 112 and the second under clamp 122 at locations corresponding to the first outer peripheral contact location A and the second outer peripheral contact location B. To do. Following the conveyance to the both under clamps, the first upper clamp 110 and the second upper clamp 120 that have been retracted are set so that the lower joint Sbd of the lower clamp joins the upper joint Sbu of the corresponding under clamp. Then, both upper clamps are pressed by a pressing device (not shown). As a result, the high pressure gas tank Wt is held by the perfect circular tank holding arcuate surface Sb of the design radius rs and held by the clamps of the first and second upper / under in the entire outer periphery of the cylinder portion Wts. The In such a tank holding state, the center axis of the tank holding arcuate surface Sb, the first outer peripheral contact portion A, and the second outer peripheral contact portion are gripped by the tank holding arcuate surface Sb over the entire outer periphery of the cylinder portion Wts. The tank center axis CL determined by the outer periphery of the cylinder portion Wts in B, that is, the tank center axis CL determined by the gripping portion by the first and second upper / under clamps coincides with high accuracy. This is because the high-pressure gas tank Wt follows the perfect circular tank holding arcuate surface Sb having the design radius rs at the gripping location by the first and second upper / under clamps.

  Following the tank holding described above, the digital gauge 140 is rotated around the axis of the rotation axis DCL that is the central axis of the tank holding arcuate surface Sb via the holding arm 131. Thereby, the coaxiality of the base Wtk with respect to the tank center axis CL is measured from the digital gauge 140. After the measurement, the above procedure is reversed to remove the high-pressure gas tank Wt, and the coaxiality measurement is performed for the new high-pressure gas tank Wt.

  As described above, according to the coaxiality measurement using the geometric tolerance measuring apparatus 100 of the present embodiment, the outer periphery of the cylinder portion Wts at the first outer peripheral contact portion A and the second outer peripheral contact portion B shown in FIG. In measuring the coaxiality of the base Wtk with the tank center axis CL determined by the first and second upper / under clamps as the datum, the high pressure gas tank Wt is used for the first and second high pressure gas tanks Wt. The upper and under clamps may be held and held, and the high-pressure gas tank Wt is not rotated. Therefore, according to the coaxiality measurement using the geometric tolerance measuring apparatus 100 of the present embodiment, even if the surface of the cylinder part Wts is uneven by the FW method, the influence of the unevenness is measured on the coaxiality measurement accuracy of the base Wtk. Therefore, the coaxiality of the base Wtk can be measured with high accuracy. In addition, since a high-pressure gas tank Wt whose outer shape becomes large because a large amount of gas storage is required, it is not necessary to rotate the tank rotating device and its drive source. From this point, according to the coaxiality measurement using the geometric tolerance measuring apparatus 100 of the present embodiment, the device configuration can be simplified and downsized. Further, since the digital gauge 140 is rotated, the motor 132 may be a small motor, and the measurement cost can be reduced.

  In addition, in the geometrical tolerance measuring apparatus 100 of the present embodiment, the cylinder portion Wts is gripped over the entire outer periphery thereof by a perfect circular tank holding arcuate surface Sb having a design radius rs to hold the high pressure gas tank Wt. Accordingly, the high-pressure gas tank Wt having an uneven surface is made to follow the perfect circular tank holding arcuate surface Sb having the design radius rs so that the central axis of the tank holding arcuate surface Sb and the tank central axis CL coincide with each other with high accuracy. The coaxiality of the base Wtk can be measured with higher accuracy by the rotation of the digital gauge 140 around the axis of the rotation axis DCL that coincides with the central axis of the tank holding arcuate surface Sb.

  Since the geometric tolerance measuring apparatus 100 of the present embodiment can measure the coaxiality of the base Wtk with high accuracy, the high-pressure gas tank Wt having a measured coaxiality in a predetermined range can be shipped as a non-defective product. For this reason, the non-defective high-pressure gas tank Wt can be connected to the base Wtk without difficulty according to the work procedure if it is installed on the mounting base of the fuel cell vehicle. That is, since the rigidity is high, the gas pipe whose position freedom of the connection port at the pipe end is not so high can be easily connected to the base Wtk, and the pipe connection work becomes simple. For the high-pressure gas tank Wt whose measurement coaxiality is outside the predetermined range, the surface irregularities and the outer diameter of the cylinder portion Wts can be corrected with a file or the like while pivoting the caps Wtk at both ends of the tank. In this way, the corrected high-pressure gas tank Wt can be handled in the same way as a non-defective high-pressure gas tank Wt having a predetermined measurement coaxiality.

  Next, another embodiment will be described. FIG. 5 is an explanatory view schematically showing a schematic configuration of the geometric tolerance measuring apparatus 100A of another embodiment as viewed from the front and side, and FIG. 6 shows an example of the state of mounting of the spacer 150 and a possible form of the spacer. It is explanatory drawing. This embodiment is characterized in that the spacer 150 absorbs the unevenness of the cylinder portion Wts.

  As shown in the figure, the geometric tolerance measuring apparatus 100A of the present embodiment has a first upper clamp 110, a first under clamp 112, and a second upper clamp, as well as the geometric tolerance measuring apparatus 100 described above. 120, a second under clamp 122, and a measurement mechanism unit 130. The first upper clamp 110 and the first under clamp 112, and the second upper clamp 120 and the second under clamp 122 are paired to hold the high-pressure gas tank Wt up and down. Both of these clamps have a circular arc of a perfect circle defined by a radius (rs + α) exceeding the design radius rs of the high-pressure gas tank Wt, specifically, a tank holding arcuate surface SbL that is a semicircular arc. Then, the first and second upper / under clamps form a perfect circle defined by the radius (rs + α) by joining the joint upper surface Sbu and the joint lower surface Sbd, and the radius (rs + α) The outer circumference of the cylinder portion Wts of the high-pressure gas tank Wt is surrounded by the perfect circular tank holding arcuate surface SbL. The first and second upper / under clamps are provided with spacers 150 dotted on the tank holding arcuate surface SbL. The spacer 150 is formed from a rubber material having elasticity, and is adhered to the surface of the tank holding arcuate surface SbL. As shown in FIG. 6, the spacer 150 can be a thin leaf-like rectangular parallelepiped having the same width as that of the tank holding arcuate surface SbL, or a thin leaf-like rectangular solid having a length shorter than the width of the tank holding arcuate surface SbL. Or a grooved spacer 152 having multiple rows of grooves 153 on the tank holding arcuate surface SbL side. Each of the spacers including the spacer 150 has elasticity and a thickness corresponding to a difference α between the design radius rs of the high-pressure gas tank Wt and a radius (rs + α) exceeding the design radius rs.

  In the geometric tolerance measuring apparatus 100A of this embodiment, a spacer 150 having a thickness corresponding to the difference α is interposed between a perfect tank holding arcuate surface SbL defined by a radius (rs + α) and the cylinder portion Wts. In this state, the outer periphery of the cylinder portion Wts of the high-pressure gas tank Wt is gripped over almost the entire area by the first and second upper / under clamps. That is, in the geometrical tolerance measuring apparatus 100A of the present embodiment, the surface unevenness of the cylinder part Wts is absorbed by the spacer 150 having the thickness and elasticity corresponding to the difference α, and then the cylinder part Wts of the high-pressure gas tank Wt. Is gripped over almost the entire area. Therefore, according to the geometric tolerance measuring apparatus 100A of the present embodiment, the tank center axis CL of the high-pressure gas tank Wt can be more accurately aligned with the center axis of the tank holding arcuate surface SbL regardless of the irregularities on the outer peripheral surface of the cylinder portion Wts. The coaxiality of the base Wtk with respect to the tank center axis CL can be measured with high accuracy. In this case, the same applies even when the split type spacer 151 and the grooved spacer 152 shown in FIG. 6 are used. In particular, since the grooved spacer 152 includes multiple rows of grooves 153 on the tank holding arcuate surface SbL side, the absorption efficiency of the surface irregularities of the cylinder portion Wts is increased by the shrinkage of the grooves 153, so that the coaxiality measurement can be performed with higher accuracy. Is possible.

  As described above, the geometric tolerance measuring apparatus 100A in which the spacers 150 to 152 are used in combination can be an embodiment described below. That is, the spacers 150 to 152 are formed through hardness adjustment including blending of a hardness adjusting agent, and the hardness increases as the weight of the high-pressure gas tank Wt to be measured increases. By using the spacers 150 to 152 with such hardness adjustment, it is possible to suppress the deviation between the tank center axis CL and the center axis of the tank holding arcuate surface Sb due to the weight of the high pressure gas tank Wt, thereby suppressing or avoiding the influence of the tank weight. Thus, the coaxiality of the base Wtk can be measured with high accuracy. In this case, the above-mentioned hardness adjustment can be performed only for the spacers 150 to 152 in the first under clamp 112 and the second under clamp 122 that directly receive the tank weight. In addition, after adjusting the hardness of the spacers 150 to 152 for the upper and under clamps, the first upper clamp 110 and the spacers 150 to 152 in the first under clamp 112 and the second under clamp 122 that directly receive the tank weight are used. The hardness may be higher than that of the spacers 150 to 152 in the second upper clamp 120.

  FIG. 7 is an explanatory view schematically showing a schematic configuration of the geometric tolerance measuring apparatus 200 according to another embodiment when viewed from the front. FIG. 8 is a side view of the geometric tolerance measuring apparatus 200 and shows how the tank is held. It is explanatory drawing shown. This embodiment is characterized in that tank loading and tank holding are performed by a series of operations.

  As shown in the figure, the geometric tolerance measuring apparatus 200 of the present embodiment includes a first upper clamp 210, a first under clamp 212, a second upper clamp 220, and a second one similar to the geometric tolerance measuring apparatus 100 described above. An underclamp 222 and a measurement mechanism unit 130 are provided, and a pressing mechanism 250 also serving as a tank lifter is provided. The first and second upper / under clamps, as in the case of the first upper clamp 110, etc., hold the high pressure gas tank Wt up and down as a pair, and are defined by the design radius rs of the high pressure gas tank Wt. It has a tank holding arcuate surface Sb which is a circular arc, specifically a semicircular arc. The geometric tolerance measuring apparatus 200 of this embodiment includes a first upper clamp 210 and a second upper clamp 220 on the first frame 102a, and a first upper clamp 210 and a second upper clamp 220 on the second frame 102b. A measurement mechanism unit 130 is provided. In addition, the geometric tolerance measuring apparatus 200 includes a first gantry 102a and a second gantry 102b that are slidable horizontally in the left-right direction in FIG. 7 along a linear rail (not shown) on the underside of the gantry. Thereby, the geometric tolerance measuring apparatus 200 slides the first upper clamp 210 and the second upper clamp 220 between the standby position SP and the working position WP together with the first upper clamp 210 together with the first frame 102a. The second upper clamp 220 and the measurement mechanism unit 130 are slid between the standby position SP and the working position WP together with the second frame 102b. The first and second upper / under clamps hold the high-pressure gas tank Wt at the working position WP. Further, the measurement mechanism unit 130 rotates the digital gauge 140 around the rotation axis DCL, that is, the axis of the tank center axis CL of the cylinder unit Wts at the working position WP.

  The pressing mechanism 250 includes a plate 230 positioned on the tank lower side, a tank base 232, a connecting arm 251, and a clamp pressing arm 252. The plate 230 moves up and down between a standby position SP below the first and second mounts and a working position WP above the mounts by a vertical movement drive mechanism (not shown). As shown in FIG. 8, the tank base 232 receives the high-pressure gas tank Wt from below, for example, with a V-shaped bevel, and moves up and down between the standby position SP and the working position WP together with the plate 230. As shown in FIGS. 7 to 8, the clamp pressing arm 252 is connected to the tank base 232 or the plate 230 by a connecting arm 251. Therefore, even in the clamp pressing arm 252, the plate 230 moves up and down between the standby position SP and the working position WP. In this case, the pressing mechanism 250 positions the clamp pressing arm 252 above the first upper clamp 210 and the second upper clamp 220 at the working position WP. The clamp pressing arm 252 is at a height that interferes with the first upper clamp 210 and the second upper clamp 220 at the standby position SP. However, at the standby position SP, both the clamps are located on the right or left side in FIG. No interference occurs because it is located at the standby position SP.

  Next, a measurement sequence of the coaxiality of the base Wtk using the geometric tolerance measuring apparatus 200 will be described. That is, the geometric tolerance measuring apparatus 200 of this embodiment includes a sequence control device (not shown), and automatically measures the coaxiality of the base Wtk through the operation of the start button. Before operating the start button, the geometric tolerance measuring apparatus 200 places the first upper clamp 210 and the like at the standby position SP described above, and waits for the high-pressure gas tank Wt to be loaded into the tank base 232. When the high-pressure gas tank Wt is loaded and placed on the tank pedestal 232 and the start button is operated, the geometric tolerance measuring apparatus 200 moves the tank pedestal 232 and the pressing mechanism 250 up and down to the working position WP together with the plate 230. The working position WP is set so that the high-pressure gas tank Wt is substantially at the center of the separated first upper clamp 210 and the first under clamp 212 and the separated second upper clamp 220 and the second under clamp 222. .

  When the elevation of the plate 230 to the working position WP is completed, the geometric tolerance measuring apparatus 200 includes the first upper clamp 210, the first under clamp 212, the second upper clamp 220, the second under clamp 222, and the measurement mechanism unit 130. , Slide the gantry from the standby position SP to the working position WP. During this time, the first and second upper / under clamps remain separated. The working position WP is set such that the first and second upper / under clamps that are separated from each other are the datum positions described with reference to FIG. When this state is viewed from the side, as shown in FIG. 8A, the high-pressure gas tank Wt placed on the tank base 232 is separated between the first upper clamp 210 and the first under clamp 212 which are separated from each other. Located between the upper clamp 220 and the second under clamp 222, the pressing mechanism 250 positions the clamp pressing arm 252 above the first and second upper clamps. In FIG. 8A, the plate 230 and the tank pedestal 232 interfere with the first under clamp 212 and the second under clamp 222. However, the plate 230 and the tank pedestal 232 are connected to each other as shown in FIG. Since it is located between the first and second under clamps, no device interference occurs.

  When the above-described clamping slide is completed, the geometric tolerance measuring apparatus 200 lowers the plate 230, the tank base 232, and the pressing mechanism 250. As a result, the high pressure gas tank Wt is lowered so as to approach the tank holding arcuate surface Sb of the first under clamp 212 and the second under clamp 222, and the pressing mechanism 250 moves the clamp pressing arm 252 to the first upper clamp 210 and the second upper clamp. Press against the ceiling surface of the clamp 220 (FIG. 8A). Since the geometric tolerance measuring apparatus 200 further continues the above-described device lowering, the tank base 232 replaces the placed high-pressure gas tank Wt with the first under clamp 212 and the second under clamp 222. As a result, the high pressure gas tank Wt is in a state where the outer peripheral surface of the cylinder portion Wts is joined to the tank holding arcuate surface Sb of the under clamp, and is held from below by the under clamp. Further, the pressing mechanism 250 pushes down the first upper clamp 210 and the second upper clamp 220 with the clamp pressing arm 252 (FIG. 8B). Since the geometric tolerance measuring apparatus 200 continues the above-described apparatus descent until the plate 230 or the like returns to the standby position SP, the first upper clamp 210 and the second upper clamp 220 are continuously pushed down by the clamp pressing arm 252. Eventually, the joining lower surface Sbd is joined to the joining upper surface Sbu of the first under clamp 212 and the second under clamp 222 (FIG. 8C). As a result, the high pressure gas tank Wt is gripped over the entire outer periphery by the tank holding arcuate surface Sb of the first and second upper / under clamps in the cylinder portion Wts and held by the clamp.

  When the plate 230 or the like returns to the standby position SP and the holding of the high-pressure gas tank Wt is completed, the geometric tolerance measuring apparatus 200 controls the drive of the motor 132 so that the digital gauge 140 and its contacts come into contact with the outer periphery of the base Wtk. As it is, it is rotated around the rotation axis DCL, that is, the axis of the tank center axis CL of the cylinder portion Wts. By reading the output of the digital gauge 140 at this time, the coaxiality measurement of the base Wtk is completed. Since the geometric tolerance measuring apparatus 200 performs the above-described sequences in reverse after the measurement is completed, the high-pressure gas tank Wt whose coaxiality has been measured is carried out of the geometric tolerance measuring apparatus 200. The first upper clamp 210 and the second upper clamp 220 are lifted away from the corresponding under clamp by a return mechanism (not shown) using a shaft material and a spring between the corresponding under clamp.

  As described above, according to the geometric tolerance measuring apparatus 200 of the present embodiment, the coaxiality of the base Wtk can be automatically measured with high accuracy without the rotation of the high-pressure gas tank Wt, as in the above-described embodiment. Therefore, it is possible to improve the measurement efficiency and reduce the number of measurement work steps. Further, according to the geometric tolerance measuring apparatus 200 of the present embodiment, it is only necessary to slide the apparatus in the horizontal direction and the vertical direction, so that the equipment configuration can be unified and simplified.

  FIG. 9 is an explanatory view schematically showing a schematic configuration of the geometric tolerance measuring apparatus 100B of another embodiment as viewed from the side. This embodiment is characterized in that the high-pressure gas tank Wt is held by gripping a part of the outer periphery of the cylinder portion Wts.

  As illustrated, the geometric tolerance measuring apparatus 100B of the present embodiment includes a first upper clamp 110B and a first under clamp 112B, and a second upper clamp 120B and a second under clamp 122B on the apparatus base 102. The first upper clamp 110B and the first under clamp 112B are paired to hold the high-pressure gas tank Wt up and down. Both clamps have a tank holding arcuate surface Sb that is a perfect circular arc defined by the design radius rs of the high-pressure gas tank Wt. Then, the first upper clamp 110 and the first under clamp 112 are joined to each other by interposing the gap defining block Bd between the joining upper surface Sbu and the joining lower surface Sbd, so that a perfect circle having the design radius rs is partially formed. An area, specifically, a lower arc region and an upper arc region is formed, and the outer periphery of the cylinder portion Wts of the high-pressure gas tank Wt is held by the perfect circular tank holding arc-shaped surface Sb of the design radius rs to hold the tank. To do. In this case, the interval defining block Bd defines the interval between the upper and under clamps, and positions the upper and under clamps with pins provided on the upper and lower surfaces thereof. The same applies to the second upper clamp 120B and the second under clamp 122B.

  Also with the geometric tolerance measuring apparatus 100B of the embodiment shown in FIG. 9, the coaxiality of the base Wtk can be measured with high accuracy without the rotation of the high-pressure gas tank Wt as in the embodiment described above.

  The present invention is not limited to the above-described embodiment, and can be realized with various configurations without departing from the spirit of the present invention. For example, the technical features of the embodiments corresponding to the technical features in each embodiment described in the summary section of the invention are intended to solve part or all of the above-described problems, or part of the above-described effects. Or, in order to achieve the whole, it is possible to replace or combine as appropriate. Further, if the technical feature is not described as essential in the present specification, it can be deleted as appropriate.

  For example, in each of the above embodiments, a pair of upper and under clamps are used for holding the tank, but only the under side clamp is provided, and the outer circumference of the cylinder portion Wts is provided on the tank holding arcuate surface Sb of the under side clamp. May be joined to hold the tank. In this case, the underside clamp may have a V-shaped bevel.

  In each of the above embodiments, the high-pressure gas tank Wt is the measurement target as a finished product in which the fiber reinforced resin layer in which the fiber is wound by the FW method is formed. However, prior to the fiber winding by the FW method, the geometric The coaxiality of the base Wtk may be measured by the tolerance measuring apparatus 100 or the like. This has the following advantages. The high-pressure gas tank rotates a hollow resin liner around the bases Wtk at both ends of the fiber liner when the fiber is wound by the FW method. For this reason, if the geometrical tolerance between the cylinder part Wts of the resin liner and the base Wtk is not within a predetermined range, the cylinder part Wts receives the winding of the reinforcing fiber while rotating with a shaft shake. The rotation becomes uneven and the equalization of the reinforcing strength may be hindered. However, if the coaxiality of the base Wtk is measured with the geometric tolerance measuring apparatus 100 or the like before the hollow resinous liner is subjected to the FW method, the resinous liner whose measurement coaxiality is within a predetermined range is regarded as a good product. The high pressure gas tank Wt can be manufactured by performing the FW method. For the resin liner whose measurement coaxiality is outside the predetermined range, the surface of the cylinder portion Wts of the resin liner is cut while rotating with the bases Wtk at both ends being pivoted, or the cylinder portion Wts of the resin liner. The coaxiality of the resin liner and the base Wtk can be corrected by cutting the surface of the base Wtk while supporting and rotating the shaft. By doing so, the high-pressure gas tank Wt can be manufactured by treating the straightened resin liner by the FW method.

  In each of the above embodiments, the contact-type digital gauge 140 is used as the measurement device, but a non-contact measurement device may be used. For example, a light reflection type distance sensor may be used instead of the digital gauge 140. In the case of using a light reflection type distance sensor, the light irradiation locus crosses the rotation axis DCL after being held around the rotation axis DCL by the holding arm 131 of the measurement mechanism unit 130. In this case, if the deviation between the light irradiation locus and the rotation axis DCL is grasped in advance, the intersection between the light irradiation locus and the rotation axis DCL becomes unnecessary. In other words, the measuring device is composed of various measuring devices regardless of contact type or non-contact type, and measures the distance between a specific part of the measuring device and the outer periphery of the base Wtk, which is a small-diameter end member, or changes in distance. It is only necessary to have a function of measuring the geometric tolerance of the base Wtk by measuring.

100, 100A, 100B ... Geometric Tolerance Measuring Device 102 ... Device Base 102a ... First Base 102b ... Second Base 110, 110B ... First Upper Clamp 112, 112B ... First Under Clamp 114 ... Leg 120, 120B ... Second Upper Clamp 122, 122B ... 2nd under clamp 130 ... Measurement mechanism part 131 ... Holding arm 132 ... Motor 140 ... Digital gauge 150 ... Spacer 151 ... Split type spacer 152 ... Spacer with groove 153 ... Groove 200 ... Geometric tolerance measuring device 210, 212 ... First under clamp 220, 222 ... Second under clamp 230 ... Plate 232 ... Tank base 250 ... Pressing mechanism 251 ... Connecting arm 252 ... Clamp pressing arm A ... First outer periphery abutting point B ... Second outer periphery abutting portion CL ... Center axis SP ... Standby position WP ... Working position Sb, SbL ... Tank holding arcuate surface Bd ... Spacing regulation block rs ... Design radius Wt ... High pressure gas tank Wtd ... Dome part Wts ... Cylinder part Wtk ... Base DCL ... Rotating shaft Sbd ... Joining Lower surface Sbu ... Bonding upper surface

Claims (5)

A method of measuring a geometric tolerance of a cylindrical container having a cylindrical body member and a cylindrical end small-diameter member extending from an end of the member,
Holding the cylindrical container on the outer periphery of the body member (1);
The rotatable measuring device about the axis of the rotary shaft to match the rotation axis to the central axis of the body member to which the held and hold, a-holding lifting already measuring device about the axis of the pre-Symbol rotation axis A method for measuring a geometric tolerance of a cylindrical container, comprising the step (2) of rotating. The step (1), using a jig having an arcuate holding portion formed by an arc of a perfect circle defined by radius design of the body member, with the arcuate holding portion of the jig, the circularity the central axis of the body member to the central axis grips the outer periphery of the pre-Symbol body member so as to match, the body member to retain,
2. The geometric tolerance measurement of the cylindrical container according to claim 1 , wherein matching the rotation axis with the central axis of the body member in the step (2) is matching the rotation axis with the central axis of the perfect circle. Method. A cylindrical container geometric tolerance measuring device having a cylindrical body member and a cylindrical end small diameter member extending from an end of the member,
A jig installed on an apparatus base and holding the cylindrical container on the outer periphery of the body member;
A measuring device for measuring a distance from an outer periphery of the end small-diameter member extending from an end of the body member along the central axis of the held body member;
The device is installed to the gantry, and a device holding portion for rotatably holding the front Symbol measurement device rotatable around the axis of the rotary shaft,
The jig is
An arc-shaped holding portion formed by a perfect circular arc defined by a design radius of the body member, and the central axis of the body member coincides with a central axis of the perfect circle formed by the arc-shaped holding portion said gripping the outer periphery of the body member at arc holder so, the body member to retain,
The previous device holder
The on-matched the rotational axis of the measuring device to the central axis of a perfect circle, geometric tolerance measurement apparatus of the cylindrical container you can rotate the measuring device the arcuate holding portion is formed. The jig Examples arcuate holding part, the clamp having a radius (rs + alpha) the cylindrical container holding the arcuate surface formed by an arc of a perfect circle defined by beyond design radius rs of the body member, said design radius the excess of rs and the design radius radius (rs + alpha) and geometric tolerances measuring device of the cylindrical container according to claim 3, further comprising wearing the spacers Ru and a thickness and elasticity that corresponds to the difference alpha of. Before SL spacer, geometric tolerance measurement apparatus of the cylindrical container according to claim 4, hardness higher weight increases of the cylindrical container of the measurement object is formed by receiving a temper to increase.

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