Flange joint structure and joining method of a cylinder

Abstract

To provide a flange joint structure of a cylindrical body which can secure joint strength of a flange while reducing costs compared to conventional products, and to provide a joint method.SOLUTION: A linear bush 1 includes: a metallic cylindrical body 2; a metallic annular flange 3; and a metallic inner fixing ring 4. On an outer peripheral surface of the cylindrical body 2, a first groove 22 is formed along a circumferential direction at a first joint part 21 facing an inner peripheral surface of the flange 3. The inner peripheral surface of the flange 3 has a second groove 32 at a second joint part 31 facing the outer peripheral surface of the cylindrical body 2. The inner fixing ring 4 is formed in a substantially C shape and attached to the first groove 22 and the second groove 32. The first joint part 21, the second joint part 31, and the inner fixing ring 4 are bonded by a thermosetting adhesive. The structure can provide the linear bush 1 having higher strength than a resin flange etc. at costs lower than that of brazing.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a structure and a joining method for joining a flange to a cylindrical body.

Background Art

[0002] As products in which a flange is provided on a cylindrical body, linear bushings (linear bearings), linear ball bearings, etc. are known. As conventional products of this type, there are those in which a flange is integrally formed on a cylindrical body by machining from a columnar or cylindrical metal member, and those in which a metal flange is brazed to a metal cylindrical body to form an integral unit.

[0003] Further, Patent Document 1 discloses a technique in which a metal cylindrical body is placed in a mold and a flange is provided on the outer periphery of the cylindrical body by resin molding. According to this technique, since the flange can be formed by integral molding with the cylindrical body and the mold, it is said that the formation of the flange becomes easy.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the case of forming a flange by machining in conventional products, much of the material is cut away and wasted, and there is a disadvantage that the processing work cost is also high. Further, even in the case of brazing the flange, processing costs such as material cost, heat treatment cost, and polishing cost of the flange are problematic. Although the product described in Patent Document 1 is excellent in terms of cost, since the flange is made of resin, there are problems with the strength of the flange and the joining strength between the flange and the cylindrical body.

[0006] An object of the present invention is to provide a flange joining structure and a joining method for a cylindrical body that can suppress costs compared to conventional products and ensure the strength of the flange and the joining strength.

Means for Solving the Problems

[0007] To achieve the above object, the joining structure of the present invention is made of metal a joining structure that joins the outer peripheral surface of a cylindrical body and made of metal the inner peripheral surface of an annular flange, wherein the cylindrical body has a first groove provided along the circumferential direction at a first joining portion facing the inner peripheral surface of the flange, and the flange has a second groove provided along the circumferential direction at a second joining portion facing the outer peripheral surface of the cylindrical body, and an made of metal internal fixing ring is provided and at least the first joining portion and the second joining portion are adhered by an adhesive , the width of the internal fixing ring in the axial direction of the cylindrical body is formed to be 15% or more and less than 30% of the axial length of the joint portion between the first joint portion and the second joint portion characterized in that.

[0008] According to the flange joining structure of the cylindrical body of the present invention, the cylindrical body and the flange are joined by an adhesive. Further, a first groove is formed in the first joining portion of the cylindrical body, a second groove is formed in the second joining portion of the flange, and an internal fixing ring is mounted in these grooves. With this adhesive and the internal fixing ring, the strength required for the product can be ensured. Further, with this joining structure, the material cost and the processing cost can be reduced as compared with the case of brazing the flange to the cylindrical body.

[0009] Further, in the flange joining structure of the cylindrical body of the present invention, the internal fixing ring may be urged against the outer peripheral surface of the first groove by elasticity, and the inner peripheral surface of the internal fixing ring and the bottom surface of the first groove may be adhered by an adhesive. According to this configuration, the joining strength between the cylindrical body and the flange can be further improved.

[0010] Further, in the flange joining structure of the cylindrical body of the present invention, the width of the internal fixing ring in the axial direction of the cylindrical body is formed to be 15% or more and less than 30% of the axial length of the joining portion between the first joining portion and the second joining portionis When the width of the internal fixing ring is less than 15%, the strength as a ring cannot be ensured, the joining strength decreases, and when the width of the internal fixing ring is 30% or more, the joining area between the first joining portion and the second joining portion is insufficient and the joining strength decreases. Therefore, by setting the width of the internal fixing ring within this range, the joining strength between the cylinder body and the flange can be maintained within a predetermined range. Therefore, in the flange joint structure of the cylindrical body of the present invention, the cylindrical body and the flange can be used as components of a linear bush

[0011] Also, the flange joining method of the cylinder body of the present invention is made of metal a joining method for joining the outer peripheral surface of the cylinder body and made of metal the inner peripheral surface of the annular flange, wherein the cylinder body has a first groove provided along the circumferential direction at a first joining portion facing the inner peripheral surface of the flange, and the flange has a second groove provided along the circumferential direction at a second joining portion facing the outer peripheral surface of the cylinder body. An internal fixing ring to be mounted in the first groove and the second groove is prepared in a state where the first joining portion and the second joining portion face each other. The internal fixing ring is mounted in the second groove of the flange, and a diameter expanding jig having a shape in which the tip is thinner than the base end side and the outer diameter of the portion having the maximum diameter at the base end portion is substantially the same as the outer diameter of the cylinder body is inserted into the flange. A temporary mounting step of expanding the inner diameter of the internal fixing ring so that the cylinder body can be inserted into the inner diameter of the internal fixing ring, an internal fixing ring mounting step of inserting the cylinder body toward the flange in a state where the inner diameter of the internal fixing ring is expanded and pushing out the diameter expanding jig, and mounting the internal fixing ring in the first groove and the second groove, an adhesive application step of applying an adhesive to at least the first joining portion or the second joining portion, and an adhesive curing step of curing the adhesive in a state where the first joining portion and the second joining portion face each other.

[0012] According to the method for flange joining of the cylindrical body of the present invention, the internal fixing ring can be easily mounted on the first groove and the second groove, and the cylindrical body and the flange can be joined. In the method for flange joining of the cylindrical body of the present invention, in the adhesive application step, the adhesive is applied to the end where the first joint portion and the second joint portion face each other after the internal fixing ring mounting step, and the adhesive may be applied between the first joint portion and the second joint portion by capillary action between the first joint portion and the second joint portion. Alternatively, the adhesive application step may be performed before the temporary mounting step, or between the temporary adhesion step and the internal fixing ring mounting step, by applying the adhesive to one or both of the surfaces of the first joint portion or the second joint portion.

Effect of the Invention

[0013] According to the present invention, it is possible to provide a flange joining structure and a joining method for a cylindrical body that can suppress costs compared to conventional products and ensure the strength of the flange and the joining strength.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0015] Next, a joining structure and a joining method of a cylindrical body and a flange, which are an example of an embodiment of the present invention, will be described with reference to FIGS. 1 to 7. The joining structure and the joining method of the present embodiment are used for joining the cylindrical body 2 and the flange 3 of the linear bush 1 shown in FIGS. 1 and 2.

[0016] As shown in FIGS. 1 and 2, the linear bush 1 of the present embodiment includes a metal cylindrical body 2, a metal annular flange 3, and a metal internal fixing ring 4. As the materials of these members, materials widely used for linear bushes such as SUS440C or SUJ2 (high-carbon chromium bearing steel) can be used.

[0017] The linear bush 1 is configured such that balls that roll on the surface of a shaft to be mounted are held by a holder on the inner peripheral surface of the cylindrical body 2, but the mechanism of the inner peripheral surface of the cylindrical body 2 is not shown.

[0018] In addition, the linear bush 1 of the present embodiment is in the state shown in FIG. 2 before assembly. A first joint portion 21 facing the inner peripheral surface of the flange 3 is provided on the outer peripheral surface of the cylindrical body 2. In the axial direction of the cylindrical body 2, a first groove 22 is formed along the circumferential direction near the center of the first joint portion 21.

[0019] The flange 3 is an annular member, and a second joint portion 31 facing the outer peripheral surface of the cylindrical body 2 is provided on its inner peripheral surface. In addition, a second groove 32 is formed along the circumferential direction near the center of the second joint portion 31. In the flange 3 of the present embodiment, four attachment holes 33 are formed with countersinks that can be bolt-connected to a fixing object such as the flange 3 and a device.

[0020] The internal fixing ring 4 is formed in a substantially C shape that is annular and partially cut. As shown in FIG. 3, the axial width 4W of the cylindrical body 2 is formed to be substantially the same width as the first groove 22 and the second groove 32. In addition, the width 4W of the internal fixing ring 4 is formed to be 15% or more and less than 30% of the axial length L of the joint portion between the first joint portion 21 and the second joint portion 31.

[0021] Further, the inner diameter of the internal fixing ring 4 is formed to be smaller than the outer diameter of the first groove 22. Also, as shown in FIG. 3, the thickness 4T of the internal fixing ring 4 is formed to be thicker than the depth of the first groove 22, and when it is mounted in the first groove 22, it is formed to have a thickness that protrudes outward from the outer peripheral surface of the cylindrical body 2.

[0022] On the other hand, the thickness 4T of the internal fixing ring 4 is formed to be thinner than the depth 32D of the second groove 32. Therefore, when the internal fixing ring 4 is mounted in the second groove 32 and its inner diameter is expanded to the same dimension as the inner diameter of the second joint portion 31, it is designed to be housed inside the second groove 32.

[0023] Next, the details of the joining structure between the cylindrical body 2 and the flange 3 of the present embodiment will be described with reference to FIG. 3. As shown in FIG. 3, the first joint portion 21 on the outer peripheral surface of the cylindrical body 2 faces and is in close contact with the second joint portion 31 on the inner peripheral surface of the flange 3. The first joint portion 21 and the second joint portion 31 are adhered by a thermosetting adhesive.

[0024] The internal fixing ring 4 is mounted in the first groove 22, and its inner peripheral surface 4a is biased and in close contact with the bottom surface 22b of the first groove 22 by its own elasticity, and both are adhered by an adhesive. The side surface of the internal fixing ring 4 is in close contact with a part of the side surface of the first groove 22 and the side surface of the second groove 32, and each surface is adhered by an adhesive.

[0025] The adhesive used in the joining structure of the present embodiment is a thermosetting adhesive. In the present embodiment, a one - component epoxy heat - curing type adhesive is used. Here, for the linear bush 1, there are products that require heat resistance and products that do not require much heat resistance. In the case of products that require heat resistance, adhesives such as 3M's structural adhesives EW2034, EW2045, or EW2046 can be used. In the case of products that do not require much heat resistance, adhesives such as the company's EW2010 or SW2214 can be used.

[0026] Next, a method for joining the cylinder 2 and the flange 3 in the linear bush 1 of the present embodiment will be described. First, as a cleaning step, the outer peripheral surface of the cylinder 2, the inner peripheral surface of the flange 3, and the surface of the internal fixing ring 4 are cleaned and degreased.

[0027] Next, as a temporary fitting step, in addition to the cylinder 2 and the flange 3, an internal fixing ring 4 is prepared, and the internal fixing ring 4 is temporarily fitted to the flange 3. Specifically, as shown in FIGS. 4(A) and 4(B), the internal fixing ring 4 is inserted into the second groove 32 of the flange 3. Since the inner diameter of the internal fixing ring 4 is formed to be smaller than the outer diameter of the first groove 22 of the cylinder 2, even when the internal fixing ring 4 is inserted into the second groove 32, the internal fixing ring 4 protrudes inward from the second groove 32.

[0028] From this state, as shown in FIG. 4(B), the diameter-expanding jig 6 is inserted into the flange 3, and the inner diameter of the internal fixing ring 4 is expanded so that the cylinder 2 can be inserted. The diameter-expanding jig 6 has a substantially truncated conical shape in which the tip is thinner than the base end side, and the outer diameter of the portion having the maximum diameter at the base end portion is formed to be substantially the same as the outer diameter of the cylinder 2.

[0029] Next, as shown in FIG. 5(A), the cylinder 2 is brought into contact with the base end portion of the diameter-expanding jig 6, and these members are set so that the diameter-expanding jig 6 is on the upper side. From this state, a cylindrical pressing jig 7 is attached to the diameter-expanding jig 6 and the flange 3. The pressing jig 7 presses the flange 3 with the pressing surface 7a at the tip, and the inner diameter of the internal through hole 7b is formed so that the diameter-expanding jig 6 and the cylinder 2 can be inserted therethrough.

[0030] Next, as the internal fixing ring mounting step, as shown in Fig. 5(B), the flange 3 held by the diameter-expanding jig 6 is pressed by the pressing jig 7 and moved to a position where the second joint portion 31 of the flange 3 faces the first joint portion 21 of the cylindrical body 2. At this time, the internal fixing ring 4 is moved from the outer peripheral surface of the diameter-expanding jig 6 to the surface of the first joint portion 21 of the cylindrical body 2, and when it is moved to the position of the first groove 22, it is fitted into the first groove 22 by its own elasticity. By this internal fixing ring mounting step, the cylindrical body 2, the flange 3, and the internal fixing ring 4 are in the state shown in Fig. 3.

[0031] Next, as the adhesive application step, as shown in Fig. 6(A), the adhesive 5 is applied using a nozzle or the like to the joint portion between the cylindrical body 2 and the flange 3, that is, the portion where the first joint portion 21 and the second joint portion 31 face each other. The adhesive 5 penetrates between the first joint portion and the second joint portion due to capillary action between the first joint portion 21 and the second joint portion 31. After the adhesive 5 has penetrated between the first joint portion and the second joint portion, the adhesive 5 that has oozed out from the joint portion of the cylindrical body 2 and the flange 3 may be removed using a solvent.

[0032] Next, the adhesive 5 is cured by the adhesive curing step. Specifically, in order to maintain the right angle shown in Fig. 7, the thermosetting resin is cured by a constant temperature bath while maintaining the right angle between the cylindrical body 2 and the flange 3 by the right angle jig 8. The right angle jig 8 has a top surface 8a and a V-shaped surface 8b formed at a right angle. The cylindrical body 2 is fixed to the V-shaped surface 8b by the stay 8c, and the right angle is ensured by fixing it to the top surface 8a with bolts 8d through the mounting holes 33 of the flange 3.

[0033] In this way, by thermally curing the adhesive using the right angle jig 8, the right angle between the axial direction of the cylindrical body 2 and the mounting surface of the flange 3 is ensured, so that additional polishing for obtaining the right angle between the cylindrical body 2 and the flange 3 becomes unnecessary.

[0034] By the above method, the metal cylinder 2 and the metal flange 3 can be joined using an adhesive to form the linear bush 1. When the strength of the linear bush 1 of this embodiment was inspected, although the strength decreased for the brazed products, it showed about five times the strength compared to the average values of the products with the cylinder and the flange screw-connected, or the products with a synthetic resin flange integrally formed on the metal cylinder.

[0035] According to the joining structure and the joining method of the cylinder 2 and the flange 3 of this embodiment, there are the following advantages compared with the case of brazing the flange 3 to the cylinder 2. First, in the case of brazing, after the brazing process, quenching, rough cylindrical processing, and internal polishing are performed. Such processing requires large-scale equipment and the like, and the work becomes complicated compared to simply performing the same processing on the single cylinder 2 or flange 3 alone.

[0036] On the other hand, according to the joining structure and the joining method of the cylinder 2 and the flange 3 of this embodiment, quenching, rough cylindrical processing, and internal polishing can be performed before the bonding step. Therefore, since these steps can be performed on each of the cylinder 2 and the flange 3 alone, large-scale equipment is not required and the work becomes easy. Thus, according to the joining structure and the joining method of the cylinder 2 and the flange 3 of this embodiment, a product with high strength at low cost can be provided.

[0037] In the above embodiment, as an example of the joining structure of the cylinder 2 and the flange 3, the linear bush 1 was described as an example, but it is not limited thereto, and any product having a cylinder and a flange may be used for other products such as a shaft holder or a linear ball bearing.

[0038] Also, in the above embodiment, the surfaces of the first joint portion 21 and the second joint portion 31 may be roughened using shot blasting or the like, or chemical treatment or the like may be performed to increase the adhesive force by the adhesive. Further, the surface of the internal fixing ring 4 and the surfaces of the first groove 22 and the second groove 32 may also be subjected to treatment such as roughening in the same manner as above. By performing such treatment, the adhesive force of the adhesive can be further strengthened.

[0039] In the above embodiment, the linear bush 1 was described by taking the round flange type with a circular outer shape of the flange 3 as an example. However, the present invention is not limited to this. As long as it is annular, it can be applied to flanges with any outer diameter, such as square corner flanges, two-sided flanges obtained by cutting the side surfaces of round flanges parallel to each other.

[0040] In the above embodiment, the linear bush 1 was described as a standard type in which the end of the flange 3 and the end of the cylinder 2 coincide. However, the present invention is not limited to this, and it can also be applied to an in-rotor type linear bush in which the end of the cylinder 2 protrudes from the end of the flange 3, or a center flange type linear bush in which the flange 3 is provided at approximately the center in the axial direction of the cylinder 2.

[0041] In the joining method of the present embodiment, the adhesive application step may be performed before the temporary fitting step. At this time, as shown in FIG. 6(B), the adhesive 5 is applied to the first joint portion 21 on the outer peripheral surface of the cylinder 2. At this time, the adhesive 5 may also be applied inside the first groove 22. In FIG. 6(B), the portion on the first groove 22 side from the position of the dashed line on the outer peripheral surface of the cylinder 2 is the first joint portion 21. Further, the adhesive application step may be performed after the temporary fitting step and before the internal fixing ring fitting step. Also in this case, the adhesive 5 may be applied to the first joint portion 21 on the outer peripheral surface of the cylinder 2.

[0042] In the joining method of the present embodiment, the expanding jig 6 is used when expanding the inner diameter of the internal fixing ring 4 so that the cylinder 2 can be inserted. However, the present invention is not limited to this, and other members can be used as long as they can expand and hold the inner diameter of the internal fixing ring 4.

[0043] In the joining method of the present embodiment, the flange 3 held by the expanding jig 6 is pressed by the pressing jig 7 and moved to a position where the second joint portion 31 of the flange 3 faces the first joint portion 21 of the cylinder 2. However, the present invention is not limited to this, and other means can be used as long as they can move the flange 3 relative to the cylinder 2.

[0044] Furthermore, in the joining method of the present embodiment, the right-angle jig 8 is used to ensure the right angle between the cylindrical body 2 and the flange 3. However, the present invention is not limited to this, and other equipment may be used as long as it can measure the right angle between the two.

Explanation of Reference Numerals

[0045] 1…Linear Bush 2…Cylindrical Body 3…Flange 4…Internal Fixed Ring 5…Adhesive 21…First Joint 22…First Groove 31…Second Joint 32…Second Groove

Claims

Claim 1: A joining structure for joining the outer peripheral surface of a metal cylinder and the inner peripheral surface of a metal annular flange, comprising: The cylinder has a first groove provided along the circumferential direction at a first joint portion facing the inner peripheral surface of the flange; The flange has a second groove provided along the circumferential direction at a second joint portion facing the outer peripheral surface of the cylinder; A metal internal fixing ring is provided and is fitted into the first groove and the second groove with the first joint portion and the second joint portion facing each other; At least the first joint portion and the second joint portion are adhered by an adhesive; The width of the internal fixing ring in the axial direction of the cylinder is formed to be 15% or more and less than 30% of the axial length of the joint portion between the first joint portion and the second joint portion. The joining structure is characterized by this.

2. The joining structure according to Claim 1, wherein the internal fixing ring is biased against the outer peripheral surface of the first groove by elasticity, and the inner peripheral surface of the internal fixing ring and the bottom surface of the first groove are adhered by an adhesive. The joining structure is characterized by this.

3. The joining structure according to Claim 1 or 2, wherein the cylinder and the flange are components of a linear bush. The joining structure is characterized by this.

4. A joining method for joining the outer peripheral surface of a metal cylinder and the inner peripheral surface of a metal annular flange, comprising: The cylinder has a first groove provided along the circumferential direction at a first joint portion facing the inner peripheral surface of the flange; The flange has a second groove provided along the circumferential direction at a second joint portion facing the outer peripheral surface of the cylinder; Prepare an internal fixing ring to be fitted into the first groove and the second groove with the first joint portion and the second joint portion facing each other; A temporary fitting step of fitting the internal fixing ring into the second groove of the flange, inserting an expanding jig having a shape with a tip thinner than the base end side and an outer diameter of a portion having the maximum diameter at the base end portion formed to be substantially the same as the outer diameter of the cylinder into the flange, and expanding the inner diameter of the internal fixing ring so that the cylinder can be inserted; An internal fixing ring fitting step of inserting the cylinder toward the flange with the inner diameter of the internal fixing ring expanded, pushing out the expanding jig, and fitting the internal fixing ring into the first groove and the second groove; An adhesive application step of applying an adhesive to at least the first joint portion or the second joint portion; A bonding method characterized by comprising an adhesive curing step of curing the adhesive in a state where the first joint portion and the second joint portion face each other.

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