JP2019090433A - Pressure resisting instrument, hydraulic cylinder, and method of manufacturing pressure resisting instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the durability of a pressure resistant device. A cylinder tube includes a main body portion 10 having a through hole 11 that opens on an end surface, and a lid portion 20 that closes the opening of the through hole 11 of the main body portion 10, and the lid portion 20 is a main body portion 10. A base portion 21 having a joint surface 21A welded to the end surface of the joint surface, an insertion portion 22 formed protruding from the joint surface 21A and inserted into the through hole 11, and an inner circumference of the through hole 11 provided in the insertion portion 22 and covering the entire circumference. It has a protruding portion 23 that is in close contact with the surface. [Selection diagram] Fig. 2

Description

  The present invention relates to a pressure resistant device, a fluid pressure cylinder, and a method of manufacturing the pressure resistant device.

  Patent Document 1 discloses a cylinder tube as a pressure-resistant device in which a cylinder tube member and a head member fitted and inserted in the cylinder tube member are joined by welding and integrated.

JP, 2002-257238, A

  In the cylinder tube as disclosed in Patent Document 1, a slight clearance remains between the inner peripheral surface of the cylinder tube member and the outer peripheral surface of the head member fitted to the cylinder tube member. In such a pressure resistant apparatus, stress concentration may occur in the welded portion by the internal pressure being introduced through the clearance.

  The present invention has been made in view of such technical problems, and an object thereof is to improve the durability of a pressure resistant apparatus.

  A first invention is a pressure-resistant device, comprising: a main body having a hollow portion opening at an end surface; and a lid portion closing the opening of the hollow portion of the main body portion, the lid portion being an end surface of the main body portion It has a base portion having a joint surface to be welded, an insertion portion formed to project from the joint surface and inserted into the hollow portion, and a projection portion provided on the insertion portion and in close contact with the inner circumferential surface of the hollow portion over the entire circumference. It is characterized by

  In the first aspect of the invention, since the projecting portion is in close contact with the inner peripheral surface of the hollow portion over the entire circumference, the clearance between the inner peripheral surface of the hollow portion and the outer peripheral surface of the insertion portion The internal pressure is prevented from acting on the weld.

  The second invention is characterized in that an annular groove is provided on the inner peripheral surface of the hollow portion, and the projecting portion is in close contact with the inner peripheral surface of the annular groove over the entire circumference.

  In the second aspect of the invention, since the projection is locked in the annular groove, separation between the two is prevented, and the clearance between the hollow portion and the insertion portion can be closed more reliably.

  According to a third aspect of the present invention, the projection is a caulking portion that is pressed against the inner peripheral surface of the hollow portion by plastic deformation.

  A fourth invention is a fluid pressure cylinder, comprising: a cylinder tube; and a piston that divides the inside of the cylinder tube into a first fluid pressure chamber and a second fluid pressure chamber, and the piston can abut on the projecting portion And a tapered portion.

  In the fourth aspect of the invention, since the projecting portion can be pressed against the inner peripheral surface of the hollow portion by the piston which is a component of the fluid pressure cylinder, jigs and the like are unnecessary, and the manufacturing cost is reduced.

  A fifth invention is a manufacturing method for manufacturing a pressure-resistant device including a main body having a hollow portion opening at an end face, and a lid closing the opening of the hollow portion of the main body. A placement step of bringing a joining surface into contact with an end face of the main body portion and inserting an insertion portion projecting from the joining face into the hollow portion of the main body portion; a welding step of welding the joining face of the base and the end face of the main body portion; And a forming step of plastically deforming the protruding portion provided in the portion and closely contacting the inner peripheral surface of the hollow portion over the entire circumference.

  In the fifth aspect of the present invention, since the protruding portion closely contacting the inner peripheral surface of the hollow portion is formed over the entire circumference, the internal pressure acts on the welded portion through the clearance between the inner peripheral surface of the hollow portion and the outer peripheral surface of the insertion portion. Being prevented.

  The sixth invention is characterized in that an annular groove is provided on the inner peripheral surface of the hollow portion, and in the molding step, the projecting portion is in close contact with the inner peripheral surface of the annular groove over the entire circumference.

  In the sixth aspect of the invention, since the projection is locked in the annular groove, separation between the two is prevented, and the clearance between the hollow part and the insertion part can be closed more reliably.

  The seventh invention is characterized in that, in the molding step, the projecting portion is pressed by a jig inserted into the hollow portion to be in close contact with the inner peripheral surface of the hollow portion.

  In the eighth invention, the pressure resistant device is a cylinder tube used for a fluid pressure cylinder, and in the forming step, the piston inserted in the main body is moved by fluid pressure, and the projection is pressed by the piston to be hollow. It is characterized in that it is in close contact with the inner peripheral surface of the part.

  In the eighth invention, since the molding process can be performed together with the operation confirmation of the fluid pressure cylinder, the manufacturing cycle can be reduced.

  According to the present invention, the durability of the pressure resistant device is improved.

It is a sectional view of a fluid pressure cylinder provided with a cylinder tube concerning a 1st embodiment of the present invention. It is an enlarged view of the A section in FIG. It is a sectional view explaining the manufacturing method of the cylinder tube concerning a 1st embodiment of the present invention, and is a figure showing the main part and lid part before joining. It is sectional drawing explaining the manufacturing method of the cylinder tube which concerns on 1st Embodiment of this invention, and is a figure which shows the state which inserted the insertion part of the cover part in the main-body part. It is sectional drawing explaining the manufacturing method of the cylinder tube which concerns on 1st Embodiment of this invention, and is a figure which shows the state which welded the main-body part and the cover part. It is sectional drawing explaining the manufacturing method of the cylinder tube which concerns on 1st Embodiment of this invention, and is a figure which shows the state before a formation process. It is sectional drawing explaining the manufacturing method of the cylinder tube which concerns on 1st Embodiment of this invention, and is a figure which shows the process of a formation process. It is sectional drawing explaining the manufacturing method of the cylinder tube which concerns on 2nd Embodiment of this invention, and is a figure which shows a formation process. It is a sectional view of a fluid pressure cylinder provided with a cylinder tube concerning a 2nd embodiment of the present invention.

  Hereinafter, a pressure resistant apparatus according to an embodiment of the present invention will be described with reference to the attached drawings.

First Embodiment
The pressure resistant device is a device in which pressure acts as an internal pressure from the fluid inside. In the following, when the pressure resistant apparatus is the cylinder tube 100 used for the fluid pressure cylinder 1 which is operated by the fluid pressure of the working fluid in the two pressure chambers (the first fluid pressure chamber 4 and the second fluid pressure chamber 5) Will be explained.

  As shown in FIG. 1, the fluid pressure cylinder 1 is inserted into the cylinder tube 100, the piston 2 sliding along the inner circumferential surface of the cylinder tube 100, and the cylinder tube 100 and connected to the piston 2. And a piston rod 3.

  The inside of the cylinder tube 100 is divided by the piston 2 into a first fluid pressure chamber 4 and a second fluid pressure chamber 5. The first fluid pressure chamber 4 and the second fluid pressure chamber 5 are filled with a working oil as a working fluid.

  At the end of the cylinder tube 100 and the tip of the piston rod 3, mounting portions 20A, 3A for mounting the fluid pressure cylinder 1 to another device are respectively provided.

  The fluid pressure cylinder 1 is extended as hydraulic oil is supplied to the first fluid pressure chamber 4 and discharged from the second fluid pressure chamber 5 through a port (not shown) provided in the cylinder tube 100. Further, the hydraulic cylinder 1 is contracted by the hydraulic fluid being supplied to the second fluid pressure chamber 5 and being discharged from the first fluid pressure chamber 4. By supplying and discharging the hydraulic fluid to the first and second fluid pressure chambers 4 and 5 inside the cylinder tube 100 at the time of the expansion and contraction operation, the hydraulic pressure of the hydraulic fluid acts on the cylinder tube 100 as an internal pressure.

  The cylinder tube 100 has a cylindrical main body portion 10 having a through hole 11 as a hollow portion opened at both end faces, a lid portion 20 attached to one end of the main body portion 10 and closing one opening of the through hole 11 And.

  At the other end of the main body 10, a cylinder head 6 for slidably supporting the piston rod 3 is attached. The cylinder head 6 is detachably provided to the main body 10 by a plurality of fastening bolts (not shown) aligned in the circumferential direction. The other opening of the through hole 11 is closed by the cylinder head 6.

  As shown in FIG. 2, on the inner peripheral surface of one end of the through hole 11 in the main body portion 10, an annular groove 11A having an arc-shaped cross section is formed over the entire circumference.

  The lid portion 20 is formed so as to protrude from the joint surface 21A of the base portion 21 having the joint surface 21A in contact with one end face 10A of the main body portion 10 and welded to the main body portion 10 and inserted into the through hole 11 The insertion portion 22 and a protrusion 23 provided at the tip of the insertion portion 22 and in close contact with the inner peripheral surface of the through hole 11 over the entire circumference are provided.

  The outer diameter of the base 21 is formed to be the same as the outer diameter of the main body 10. The mounting portion 20A is provided on the side opposite to the insertion portion 22 in the base 21 (see FIG. 1).

  The insertion portion 22 has a proximal end (right end in FIG. 1) connected to the base 21 and is formed in a cylindrical shape that extends in the axial direction of the main body 10 and protrudes from the joint surface 21A of the base 21. The outer diameter of the insertion portion 22 is substantially the same as the inner diameter of the through hole 11, and the insertion portion 22 is fitted in the through hole 11. Thereby, centering (alignment) for welding the main body portion 10 and the lid portion 20 is performed.

  The projecting portion 23 is a caulking portion that is provided on the tip end portion (left end portion in FIG. 1) of the insertion portion 22 and is radially expanded outward by a tapered portion 2A formed on the piston 2. The projecting portion 23 is crimped radially outward over the entire circumference, and a part thereof is filled in the annular groove 11A of the through hole 11. Thus, the projecting portion 23 closely contacts the inner circumferential surface of the annular groove 11A in the through hole 11 over the entire circumference. The inner peripheral surface of the through hole 11 includes the inner peripheral surface of the annular groove 11A.

  The end face 10A of the main body portion 10 and the joint surface 21A of the base 21 of the lid portion 20 are welded to each other at the end faces, whereby the main body portion 10 and the lid portion 20 are integrated by the welding portion 30 to configure the cylinder tube 100 Do.

  In order to weld the main body portion 10 and the lid portion 20 with high accuracy, it is necessary to suppress the misalignment between the two. For this reason, the insertion portion 22 of the lid portion 20 is fitted in the through hole 11 of the main body portion 10, and centering of both is performed. However, in general, a slight gap (hereinafter, referred to as “clearance 25”) remains between the inner peripheral surface of the through hole 11 and the outer peripheral surface of the insertion portion 22 (see FIG. 2).

  For this reason, at the time of expansion and contraction operation of the fluid pressure cylinder 1, the working oil pressure infiltrates into the clearance 25 and the internal pressure acts. According to such an internal pressure, a force acts on the main body portion 10 so as to expand outward. Such a force causes stress concentration in the welded portion 30 which is a joint portion between the main body portion 10 and the lid portion 20.

  On the other hand, in the present embodiment, the protrusion 23 is formed on the inner peripheral surface of the through hole 11 in the main body 10, more specifically, on the inner peripheral surface of the annular groove 11A formed on the inner peripheral surface of the through hole 11. In close contact. Thereby, the clearance 25 is closed and the communication between the clearance 25 and the first fluid pressure chamber 4 is blocked. For this reason, even during the expansion and contraction operation of the fluid pressure cylinder 1, the entry of the hydraulic pressure into the clearance 25 is prevented. Therefore, the stress concentration due to the internal pressure acting on the weld 30 is alleviated, and the durability of the cylinder tube 100 is improved.

  Next, a method of manufacturing the cylinder tube 100 will be specifically described with reference to FIGS. 3 and 4.

  As shown in FIG. 3, before the connection between the main body 10 and the lid 20, the outer circumferential surface of the projection 23 of the lid 20 is formed in a cylindrical surface shape that is uniform with the outer circumferential surface of the insertion portion 22. 22 has substantially the same outer diameter.

  In the manufacture of the cylinder tube 100, first, as shown in FIG. 4, the end face 10A of the main body 10 and the joint surface 21A of the base 21 are brought into contact with each other, and the insertion portion of the lid 20 is inserted into the through hole 11 of the main body 10. 22 is inserted and fitted (arrangement process). Thereby, the main body 10 and the lid 20 are coaxially arranged.

  Next, in a state where the insertion portion 22 of the lid 20 is fitted in the through hole 11 of the main body 10, the main body 10 and the base 21 of the lid 20 are welded and integrated (welding process). Thereby, as shown in FIG. 5, the welding part 30 which joins the end surface 10A of the main-body part 10 and the joint surface 21A of the base 21 of the cover part 20 is formed. Welding between the main body portion 10 and the lid portion 20 can be performed by any method such as arc welding including plasma welding and TIG welding, gas welding, laser welding, electron beam welding, resistance welding, friction welding, and diffusion bonding. .

  Next, as shown in FIG. 6, the piston 2 and the piston rod 3 are inserted into the main body 10 from the other opening of the through hole 11 in the main body 10, and the cylinder head 6 is inserted into the other opening of the through hole 11. Attach the (assembly process).

  Next, a molding step of bringing the protrusion 23 into close contact with the inner peripheral surface of the through hole 11 is performed. Specifically, first, the first fluid pressure chamber 4 and the second fluid pressure chamber 5 in the cylinder tube 100 are filled with the hydraulic oil. Then, the hydraulic pressure is supplied to the second fluid pressure chamber 5, and the piston 2 and the piston rod 3 are moved in the direction in which the fluid pressure cylinder 1 contracts.

  Here, as shown in FIG. 6 and the like, the piston 2 has a tapered portion 2A which is inclined with respect to the central axis such that the outer diameter decreases toward the projecting portion 23. The tapered portion 2A is provided so as to abut on the projecting portion 23 when the piston 2 and the piston rod 3 move close to the stroke end in the contraction direction (right direction in FIG. 6).

  When the piston 2 moves to near the stroke end in the contraction direction in which the piston 2 abuts on the end face of the insertion portion 22, the tapered portion 2A of the piston 2 and the projecting portion 23 contact (see FIG. 7). From this state, when the piston 2 is further moved to the stroke end in the contraction direction, the projecting portion 23 is guided by the tapered portion 2A, and is plastically deformed radially outward over the entire circumference to be enlarged. As a result, as shown in FIG. 2, the annular groove 11 </ b> A of the through hole 11 is filled with the protrusion 23. In this manner, the projecting portion 23 is brought into close contact with the inner circumferential surface of the annular groove 11A in the through hole 11 by pressing the projecting portion 23 with the piston 2 moving by hydraulic pressure.

  In the fluid pressure cylinder 1, there is a process of operation confirmation in which the expansion and contraction operation is performed by oil pressure as the inspection after the assembly. The molding process for bringing the protrusion 23 into close contact with the inner circumferential surface of the through hole 11 is performed using the process of operation check after assembly. Specifically, the fluid pressure cylinder 1 is contracted at a predetermined pressure, and the piston 2 is moved to the stroke end in the contraction direction in which the piston 2 and the end face of the insertion portion 22 abut. Thereby, the operation confirmation of the contraction operation in the fluid pressure cylinder 1 and the step (forming step) of bringing the protrusion 23 into close contact with the inner peripheral surface of the through hole 11 are simultaneously performed. As described above, the manufacturing cycle can be shortened by simultaneously performing the operation check of the fluid pressure cylinder 1 and the step of bringing the protrusion 23 into close contact with the inner peripheral surface of the through hole 11.

  Further, since the projection 23 is in close contact with the inner peripheral surface of the through hole 11 using the piston 2 which is a component of the fluid pressure cylinder 1, a jig for expanding the diameter of the projection 23 is not necessary. Therefore, cost increase can also be prevented.

  According to the first embodiment described above, the following effects can be obtained.

  In the cylinder tube 100, the clearance 25 between the inner peripheral surface of the through hole 11 of the main body portion 10 and the outer peripheral surface of the insertion portion 22 of the lid 20 is a first fluid pressure by the projection 23 provided in the insertion portion 22. The communication with the chamber 4 is cut off. Accordingly, the hydraulic pressure is prevented from being led to the clearance 25, and the stress concentration in the welding portion 30 is alleviated. Therefore, the durability of the cylinder tube 100 can be improved.

  Further, in the cylinder tube 100, the annular groove 11A of the through hole 11 is partially filled with the projecting portion 23, and the projecting portion 23 is in close contact with the inner circumferential surface of the annular groove 11A over the entire circumference. Since the springback of the protrusion 23 is prevented by locking the enlarged protrusion 23 to the annular groove 11A, the communication between the clearance 25 and the first fluid pressure chamber 4 can be cut off more reliably. .

  Further, in the method of manufacturing the cylinder tube 100 according to the first embodiment, the diameter of the projecting portion 23 is increased by the piston 2 moved by the hydraulic pressure so as to be in close contact with the inner peripheral surface of the annular groove 11A. Therefore, the molding process can be performed simultaneously with the operation confirmation of the fluid pressure cylinder 1, and the manufacturing cycle can be shortened. In addition, a jig for expanding the diameter of the protrusion 23 is also unnecessary. Therefore, the manufacturing cost of cylinder tube 100 can be reduced.

Second Embodiment
Next, a second embodiment of the present invention will be described with reference to FIGS. 8 and 9. In the following, differences from the first embodiment will be mainly described, and the same components as those of the first embodiment will be assigned the same reference numerals and explanation thereof will be omitted.

  In the first embodiment, the piston 2 is moved by hydraulic pressure, and the protrusion 23 is expanded in diameter by the piston 2 to be in close contact with the inner circumferential surface of the through hole 11.

  On the other hand, the second embodiment differs from the first embodiment in that the diameter of the projecting portion 23 is increased by the jig 102 so as not to use the piston 2 but to closely contact the inner peripheral surface of the through hole 11. Do.

  In the manufacturing method according to the second embodiment, the steps up to the welding step are the same as those in the first embodiment, and thus the description thereof is omitted.

  In the manufacturing method according to the second embodiment, the forming step is performed after the welding step. Specifically, as shown in FIG. 8, the jig 102 is inserted from the other opening of the through hole 11 in the main body 10, and the projection 23 is pressed by the jig 102. Similar to the piston 2 in the first embodiment, a tapered portion 102A is provided at the tip of the jig 102. By pressing the jig 102 toward the projecting portion 23, the projecting portion 23 is guided by the tapered portion 102A, and is plastically deformed outward in the radial direction over the entire circumference to be enlarged. As a result, the projecting portion 23 is filled in the annular groove 11A of the through hole 11, and the projecting portion 23 is in close contact with the inner circumferential surface of the annular groove 11A in the through hole 11. Thus, the manufacture of the cylinder tube 100 is completed.

  Next, the piston 2 and the piston rod 3 are inserted into the main body 10 from the other opening of the through hole 11 in the main body 10, and the cylinder head 6 is attached to the other opening of the through hole 11. Thereby, the assembly (production) of the fluid pressure cylinder 1 is completed.

  Thus, in the second embodiment, after the welding process, the forming process is performed using the jig 102, and then the assembling process is performed.

  In the second embodiment, since the piston 2 is not used to expand the diameter of the protrusion 23, as shown in FIG. 9, it is not necessary to provide the piston 2 with the tapered portion 2A in contact with the protrusion 23. In the second embodiment, the piston 2 is provided with a relief 2B for avoiding contact with the protrusion 23. As a result, when the piston 2 moves to the stroke end in the contraction direction, the protrusion 23 separates from the piston 2 without contacting the piston 2. According to this, the stroke of the piston 2 in the contraction direction is not blocked by the projection 23. That is, the stroke end in the contraction direction can be reliably defined by the contact between the piston 2 and the insertion portion 22 of the lid 20.

  Also in the second embodiment described above, the cylinder tube 100 similar to the first embodiment can be manufactured.

  Next, modifications of the above-described embodiments will be described. The following modifications are also within the scope of the present invention, and the following modifications and each configuration of the above embodiment may be combined, or the configurations described in the different embodiments may be combined, or the following modifications may be combined It is also possible to combine

  In the above embodiments, the annular groove 11A is provided on the inner peripheral surface of the through hole 11. On the other hand, the annular groove 11A may not necessarily be provided. Even in this case, the protrusion 23 is in close contact with the inner peripheral surface of the through hole 11 to prevent the hydraulic pressure from entering the clearance 25.

  Further, in the above embodiments, the projecting portion 23 is filled in the annular groove 11A. That is, the protrusion 23 contacts substantially the entire axial direction of the annular groove 11A. On the other hand, the protrusion 23 may be in contact with only a part of the annular groove 11A in the axial direction.

  Moreover, in each said embodiment, taper part 2A, 102A which contacts the protrusion part 23 is provided in piston 2 and the jig | tool 102. As shown in FIG. On the other hand, the piston 2 and the jig 102 can be formed in any shape as long as the protrusion 23 can be brought into close contact with the inner peripheral surface of the through hole 11. For example, without providing the taper portions 2A and 102A in the piston 2 and the jig 102, the inner peripheral surface of the protrusion 23 may be formed in a tapered shape. Further, instead of the tapered portions 2A and 102A, for example, a curved surface portion in contact with the projecting portion 23 may be formed on the piston 2 or the jig 102.

  Moreover, in the said embodiment, the cylinder tube 100 used for the fluid pressure cylinder 1 was demonstrated as a pressure | voltage resistant apparatus. The pressure resistant apparatus is not limited to this, and may be a pressure vessel such as a cylinder for storing liquid or gas. In the case of a pressure resistant device in which the piston 2 moved by fluid pressure is not provided inside, the pressure resistant device may be manufactured by the manufacturing method according to the second embodiment.

  Hereinafter, the configuration, operation, and effects of the embodiment of the present invention will be collectively described.

  The cylinder tube 100 includes a main body portion 10 having a through hole 11 opening at the end face 10 A, and a lid portion 20 closing the opening of the through hole 11 of the main body portion 10. The lid portion 20 is an end face of the main body portion 10 A base 21 having a joint surface 21A to be welded to 10A, an insertion portion 22 formed to project from the joint surface 21A and inserted into the through hole 11, and an inner circumferential surface of the through hole 11 provided in the insertion portion 22 And a protrusion 23 closely attached to the

  In this configuration, since the projecting portion 23 adheres to the inner peripheral surface of the through hole 11 over the entire circumference, the internal pressure is applied to the welded portion 30 through the clearance 25 between the inner peripheral surface of the through hole 11 and the outer peripheral surface of the insertion portion 22. It is prevented from acting. Therefore, the durability of the cylinder tube 100 is improved.

  Further, in the cylinder tube 100, an annular groove 11A is provided on the inner peripheral surface of the through hole 11, and the protrusion 23 is in close contact with the inner peripheral surface of the annular groove 11A over the entire circumference.

  In this configuration, since the projection 23 is engaged with the annular groove 11A, separation between the two is prevented, and the clearance 25 between the through hole 11 and the insertion portion 22 can be closed more reliably.

  Further, in the cylinder tube 100, the protruding portion 23 is a caulking portion pressed against the inner peripheral surface of the through hole 11 by plastic deformation.

  The fluid pressure cylinder 1 includes a cylinder tube 100 and a piston 2 that divides the inside of the cylinder tube 100 into a first fluid pressure chamber 4 and a second fluid pressure chamber 5, and the piston 2 can abut on the protrusion 23 Tapered portion 2A.

  In this configuration, since the projection 23 can be pressed against the inner peripheral surface of the through hole 11 by the piston 2 which is a component of the fluid pressure cylinder 1, a jig or the like is unnecessary, and the manufacturing cost is reduced.

  The method of manufacturing the cylinder tube 100 including the main body portion 10 having the through hole 11 opened to the end face 10A and the lid portion 20 closing the opening of the through hole 11 of the main body portion 10 is the base 21 provided on the lid portion 20 Placing the joint surface 21A of the main body 10 in contact with the end face 10A of the main body 10 and inserting the insertion portion 22 projecting from the joint surface 21A into the through hole 11 of the main body 10; And a forming step of plastically deforming the protruding portion 23 provided in the insertion portion 22 and closely contacting the inner peripheral surface of the through hole 11 over the entire circumference.

  In this configuration, since the protruding portion 23 in close contact with the inner peripheral surface of the through hole 11 is formed over the entire circumference, the welded portion 30 is formed through the clearance 25 between the inner peripheral surface of the through hole 11 and the outer peripheral surface of the insertion portion 22. Internal pressure is prevented from acting on the Therefore, the durability of the cylinder tube 100 is improved.

  Further, in the method of manufacturing the cylinder tube 100 according to each of the above embodiments, the annular groove 11A is provided on the inner peripheral surface of the through hole 11, and in the forming step, the annular groove 11A is in close contact with the inner peripheral surface The protrusion 23 is formed.

  In this configuration, since the projection 23 is engaged with the annular groove 11A, separation between the two is prevented, and the clearance 25 between the through hole 11 and the insertion portion 22 can be closed more reliably.

  Further, in the method of manufacturing the cylinder tube 100 according to the second embodiment, the projecting portion 23 is pressed by the jig 102 inserted into the through hole 11 in close contact with the inner circumferential surface of the through hole 11 in the forming step.

  Further, in the method of manufacturing the cylinder tube 100 according to the first embodiment, in the forming step, the piston 2 inserted into the main body 10 is moved by hydraulic pressure, and the projection 23 is pressed by the piston 2 Close to the inner surface of 11.

  In this configuration, since the molding process can be performed together with the operation confirmation of the fluid pressure cylinder 1, the manufacturing cycle can be reduced.

  As mentioned above, although embodiment of this invention was described, said each embodiment showed only one of the application example of this invention, and the meaning which limits the technical scope of this invention to the specific structure of the said embodiment is not.

  DESCRIPTION OF SYMBOLS 1 ... Fluid pressure cylinder, 2 ... piston, 2A ... taper part, 4 ... 1st fluid pressure chamber, 5 ... 2nd fluid pressure chamber, 10 ... main-body part, 10A ... end surface, 11 ... through-hole (hollow part), 11A ... annular groove, 20 ... lid portion, 21 ... base portion, 21 A ... end surface (joining surface), 22 ... insertion portion, 23 ... projecting portion, 100 ... cylinder tube (pressure resistant device), 102 ... jig

Claims (8)

A body portion having a hollow portion opened at an end face;
And a lid for closing the opening of the hollow portion of the main body portion,
The lid is
A base having a joint surface to be welded to the end face of the main body;
An insertion portion which is formed to project from the joint surface and is inserted into the hollow portion;
And a protruding portion provided in the insertion portion and in close contact with the inner circumferential surface of the hollow portion over the entire circumference.
A pressure resistant device characterized by An annular groove is provided on the inner circumferential surface of the hollow portion,
The protrusion is in close contact with the inner circumferential surface of the annular groove over the entire circumference.
The pressure | voltage resistant apparatus of Claim 1 characterized by the above-mentioned. The projecting portion is a caulking portion pressed against the inner peripheral surface of the hollow portion by plastic deformation.
The pressure | voltage resistant apparatus of Claim 1 or 2 characterized by the above-mentioned. A cylinder tube as a pressure resistant device according to any one of claims 1 to 3;
And a piston that divides the inside of the cylinder tube into a first fluid pressure chamber and a second fluid pressure chamber.
The fluid pressure cylinder according to claim 1, wherein the piston has a tapered portion capable of abutting on the projecting portion. A manufacturing method for manufacturing a pressure-resistant device, comprising: a main body having a hollow portion opening to an end face; and a lid portion closing an opening of the hollow portion of the main body portion,
Placing the joint surface of the base portion of the lid portion in contact with the end face of the main body portion, and inserting the insertion portion projecting from the joint surface into the hollow portion of the main body portion;
A welding step of welding the joint surface of the base and the end surface of the main body portion;
And a forming step of plastically deforming the protruding portion provided in the insertion portion and closely contacting the inner peripheral surface of the hollow portion over the entire circumference.
A method of manufacturing a pressure resistant device characterized by An annular groove is provided on the inner circumferential surface of the hollow portion,
In the forming step, the protrusion is brought into close contact with the inner peripheral surface of the annular groove over the entire circumference.
A method of manufacturing a pressure resistant device according to claim 5, characterized in that. In the forming step, the projecting portion is pressed by a jig inserted into the hollow portion to be in close contact with the inner peripheral surface of the hollow portion.
The manufacturing method of the pressure | voltage resistant apparatus of Claim 5 or 6 characterized by the above-mentioned. The pressure resistant device is a cylinder tube used for a fluid pressure cylinder, and
In the forming step, a piston inserted into the main body is moved by fluid pressure, and the projection is pressed by the piston to be in close contact with the inner circumferential surface of the hollow portion.
The manufacturing method of the pressure | voltage resistant apparatus of Claim 5 or 6 characterized by the above-mentioned.

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