JP2006220233A - Installation ring and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an manufacturing method for an installation ring greatly contributing to reduction of manufacturing costs and to improvement of reliability of strength, by eliminating machining work and using a simple circular cylindrical material, and provide the installation ring. <P>SOLUTION: A circular cylindrical material 12 having a predetermined wall thickness t and a predetermined length L is made (A). Firstly, the cylindrical material 12 is compressed in the axial direction by using a mold assembly to bulge the intermediate part inward in the radial direction, and a roughly shaped work 14 having a thick-walled section 13 in the intermediate part in the axial direction is obtained(B). Next, the roughly shaped work 14 is compressed again in the axial direction by using another mold assembly to bulge two ends 14a, 14a inward in the radial direction, and the installation ring 10 having annular projections 15, 15 in both ends part is obtained(C). A groove 11, 11 between the thick-walled portion 13 and the annular projection 15 functions as a retainer groove for an elastic member press-fitted in the installation ring 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mounting ring used for mounting equipment such as a shock absorber and a gas spring, and a manufacturing method thereof.

  Conventionally, as shown by reference numeral 1 in FIG. 7, this type of attachment ring is fixed to the bottom surface of the apparatus main body 2 by a welded portion 3 sideways, and an elastic member 4 and an attachment shaft (hollow shaft) 5 inside thereof. And is used together. In such an attachment ring structure, the elastic member 4 is preliminarily bonded to the attachment shaft 5 by baking and is press-fitted and fixed to the attachment ring 1. Therefore, the attachment ring 1 and the elastic member 4 are fixed. Between them, it is necessary to prevent the elastic member 4 from coming off. Therefore, in general, as shown in FIG. 7, grooves 6 and 6 are provided on the inner surfaces of both ends of the mounting ring 1, and the elastic member 4 is bulged and deformed in the grooves 6. The elastic member 4 is used as a retaining member. Patent Document 1 also describes a similar retaining.

However, cutting is used to process the groove 6, and in this case, in addition to an increase in material cost accompanying a decrease in material yield, a decrease in productivity cannot be avoided. Therefore, Patent Document 2 proposes an attachment ring in which cutting is omitted by bending a belt-like plate body having an irregular cross-section into an annular shape and causing both ends to partially or completely abut each other.
Japanese Utility Model Publication No. 55-74844 JP-A-8-128485

  However, according to the mounting ring described in Patent Document 2, it is necessary to prepare a strip-shaped plate body having an irregular cross section, so that there is a problem that the preparation of the material is costly and does not contribute much to the reduction of the manufacturing cost. It was. Further, the abutting portions at both ends of the belt-shaped plate bent in an annular shape are joined by welding to the device main body. In such a joining mode, the abutting portions are in a state of partial joining, which is strong. There was also a problem that it was inferior in reliability.

  The present invention has been made in view of the above-described problems. The object of the present invention is not only that the cutting process can be omitted, but also enables the use of a simple cylindrical material, thereby reducing the manufacturing cost and increasing the strength. An object of the present invention is to provide a mounting ring that greatly contributes to the improvement of reliability and a manufacturing method thereof.

  In order to solve the above problems, an attachment ring according to the present invention is an attachment ring having a retaining member for preventing the elastic member from being detached on the inner surface, and the retaining member compresses the cylindrical material in the axial direction. It is formed. Since the retaining ring is formed by compressing the tubular material in the axial direction in the mounting ring configured as described above, a simple tubular material can be used as well as omitting cutting. Further, the cylindrical material is thickened by compressing in the axial direction, and sufficient strength can be obtained in combination with the seamless structure.

  In the present mounting ring, the structure of the retaining is arbitrary, and the step of the thick portion formed by raising the axial intermediate portion of the cylindrical material in the radial inward direction as in the invention according to claim 2. The structure which consists of the groove | channel between the said thick part and the protrusion formed by raising the both ends of a cylindrical raw material to radial inner direction like the invention which concerns on Claim 3 also as a structure which consists of Alternatively, as in the invention according to claim 4, the thick portion formed by raising the portion excluding the one end portion in the axial direction of the tubular material in the radial inward direction, and the one end portion of the tubular material It is good also as a structure which consists of a groove | channel between the cyclic | annular processus | protrusions formed by raising in the radial inward direction.

  In order to solve the above problems, one of the manufacturing methods of the mounting ring according to the present invention is applied to the manufacture of the invention according to claim 2, and compresses the cylindrical material in the axial direction, and the axial direction thereof. It is characterized by swelling the middle part of the inward radial direction. Further, another one of the production methods is applied to the production of the invention according to claim 3 and compresses the cylindrical material in the axial direction, and the intermediate portion in the axial direction is formed radially inward. It is characterized by comprising a first step of raising and a second step of compressing the tubular material that has finished the first step in the axial direction again and bulging both end portions inward in the radial direction. Further, another one of the present manufacturing methods is applied to the manufacturing of the invention according to the fourth aspect, and the portion excluding one end portion in the axial direction is compressed in the cylindrical material in the axial direction. It comprises a first step that swells in a radial inward direction, and a second step that compresses the tubular material that has finished the first step in the axial direction again and swells one end thereof in a radial inward direction. .

  According to the mounting ring and the method for manufacturing the same according to the present invention, it is possible to use a simple cylindrical material as well as to omit the cutting process, thereby achieving reduction in manufacturing cost. In addition, it is sufficient to ensure the strength and increase the thickness of the cylindrical material and the seamless structure, which contributes to the improvement of the strength reliability.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings.

  FIG. 1 shows a mounting ring and a manufacturing process thereof as one embodiment of the present invention. In the figure, the mounting ring 10 shown in (C) is substantially the same as the conventional mounting ring 1 shown in FIG. 7, and the inner surfaces of both ends thereof are used as retaining members for the elastic member 4. A functioning groove 11, 11 is formed.

  In manufacturing the mounting ring 10, as shown in FIG. 1A, a cylindrical material (cylindrical material) 12 having a predetermined thickness t and a predetermined length L is prepared. Then, compression is performed in the axial direction using a molding die 20 (FIGS. 2 and 3), which will be described later, and the intermediate portion is swelled radially inward, and as shown in FIG. A rough profile 14 having a meat portion 13 is obtained (first step). Next, the rough shaped member 14 is compressed again in the axial direction by using a molding die 30 (FIGS. 4 and 5), which will be described later, and both end portions 14a and 14a are swelled radially inward, and FIG. As shown in FIG. 2, the mounting ring 10 having the annular protrusions 15 and 15 at both ends is obtained (second step).

  In the mounting ring 10 obtained in this manner, the groove 11 that functions as a retaining member for the elastic member 4 is defined between the thick portion 13 and the annular protrusion 15, and therefore, cutting is not required. . Moreover, the maximum thickness T of the thick wall portion 13 is considerably thicker than the thickness t of the cylindrical material 12, and is obtained because it has a structure using a seamless cylindrical material. The strength guarantee of the mounting ring 10 is sufficient.

  Here, as shown in FIG. 2 and FIG. 3, a mold 20 for the first step for obtaining the coarse shaped material 14 from the cylindrical material 12 includes a die 22 fixed on the base 21, And a cylindrical guide 24 fixed on the base 21 so as to surround the die 22. Each of the die 22 and the punch 23 has a large-diameter main body portion 22a, 23a and a small-diameter guide portion 22b, 23b connected to each other, and a taper is provided at a corner portion on the distal end side of the guide portion 22b, 23b. Surfaces 22c and 23c are provided. In this mold 20, the diameter D of the body portion 22 a of the die 22 is the same as or slightly larger than the outer diameter of the cylindrical material 12, and the diameter d of the guide portion 22 b is the same as or larger than the inner diameter of the cylindrical material 12. On the other hand, the inner diameter of the cylindrical guide 24 is set to a size that closely fits the main body portion 22 a of the die 22. Therefore, a gap δ that is the same as or slightly larger than the wall thickness t (FIG. 1) of the cylindrical material 12 is defined between the guide portion 22b of the die 22 and the cylindrical guide 24. It can be inserted into the gap δ from the outside. The diameter of the guide portion 23b of the punch 23 is set to the same diameter as the guide portion 22b of the die 22.

  When forming the rough shaped member 14, first, the punch 23 is largely separated from the die 22, and in this state, the cylindrical material 12 is inserted into the gap δ between the cylindrical guide 24 and the guide portion 22b of the die 22. . At this time, as shown in FIG. 2, the cylindrical material 12 is inserted until its tip comes into contact with the main body portion 22 a of the die 22, and the punch 23 is brought close to the die 22 when this insertion is completed. Then, as shown in FIG. 3, the guide portion 23 b of the punch 23 is inserted into the cylindrical material 12, while the rear end of the cylindrical material 12 comes into contact with the main body portion 23 a of the punch 23, whereby the cylindrical material 12 is It is compressed in the axial direction between the punch 23 and the die 22. At this time, the outer peripheral surface of the cylindrical material 12 is constrained by the cylindrical guide 24, and the inner peripheral surfaces of both ends of the cylindrical material 12 are constrained by the guide portions 22b and 23b of the die 22 and the punch 23. The intermediate portion in the axial direction of the material 12 gradually rises in an arc shape in the radially inward direction, and finally a rough shape member 14 having a predetermined thick portion (step) 13 is obtained in the intermediate portion in the axial direction.

  Particularly in the present embodiment, since the tapered surfaces 22c and 23c are provided at the tip corners of the guide portions 22b and 23b of the die 22 and the punch 23, the cylindrical material 12 extends along these tapered surfaces 22c and 23c. It smoothly rises in the radial inward direction, thereby preventing the cylindrical material 12 from buckling. Although not shown in the figure, a knockout pin is incorporated in the die 22, and after molding, the rough shape member 14 is removed by the operation of the knockout pin.

  On the other hand, as shown in FIGS. 4 and 5, the second process mold 30 for obtaining the mounting ring 10 as the final product from the rough shape member 14 includes a die 32 fixed on the base 31. , A punch 33 disposed so as to be close to and away from the die 32, and a cylindrical guide 34 fixed on the base 31 so as to surround the die 32. Each of the die 32 and the punch 33 connects the large-diameter main body portions 32a and 33a and the small-diameter guide portions 32b and 33b, and the main body portions 32a and 33a and the guide portions 32b and 33b are tapered surfaces 32c. , 33c. In this mold 30, the diameter D ′ of the body portion 32 a of the die 32 is the same as or slightly larger than the outer diameter of the rough shape member 14, and the diameter d ′ of the guide portion 32 b is the end of the rough shape member 14. Each dimension is set to be smaller than the inner diameter of the portion 14 a by a predetermined distance, and the inner diameter of the cylindrical guide 34 is set to a dimension that fits closely to the body portion 32 a of the die 32. Therefore, a gap δ ′ larger than the thickness of the end portion 14 a (FIG. 1) of the rough shaped member 14 is defined between the guide portion 32 b of the die 32 and the cylindrical guide 34. On the other hand, the outer diameter of the main body 33a of the punch 33 is set to be slightly smaller than the inner diameter of the cylindrical guide 34, and therefore the entire punch 33 can be inserted into the cylindrical guide 34 from the outside. . The diameter of the guide portion 33b of the punch 33 is set to the same diameter as the guide portion 32b of the die 32.

  In forming the mounting ring 10, first, the punch 33 is largely separated from the die 32, and in this state, the rough shaped member 14 is inserted into the cylindrical guide 34. At this time, as shown in FIG. 4, the rough shape member 14 is inserted until the tip abuts against the main body 32 a (actually, the tapered surface 32 c) of the die 32, and the punch 33 is brought close to the die 32 by the end of the insertion. . Then, as shown in FIG. 5, while the guide portion 33b of the punch 33 is inserted into the rough shape member 14, the rear end of the rough shape member 14 abuts against the main body portion 33a (actually, the taper surface 33c) of the punch 33. In contact therewith, the coarse profile 14 is compressed axially between the punch 33 and the die 32. At this time, since the outer peripheral surface of the rough shaped member 14 is constrained by the cylindrical guide 34, both end portions 14a, 14a of the rough shaped member 14 gradually rise, and finally the mounting ring having the annular protrusions 14 at both end portions. 10 is obtained. Particularly in the present embodiment, the tapered surfaces 32c and 33c are provided at the connecting portions of the main body portions 32a and 33a of the die 32 and the punch 23 and the guide portions 32b and 33b. 14a rises smoothly inward in the radial direction along these tapered surfaces 32c and 33c. Although not shown, a knockout pin is incorporated in the die 32, and after the molding is completed, the mounting ring 10 is removed by the operation of the knockout pin.

  As described above with reference to FIG. 7, the mounting ring 10 formed as described above is fixed to the bottom surface of the apparatus main body 2 by the welded portion 3 in the lateral direction, and the elastic member 4 and the mounting shaft (hollow shaft) inside thereof. The shaft is used together with the shaft 5. In this mounting ring structure, the elastic member 4 is bonded in advance to the mounting shaft 5 by baking, and after the mounting ring 10 is welded and fixed to the device body 2, the elastic member 4 is press-fitted and fixed to the mounting ring 10. Is done. Thus, grooves 11 and 11 are defined on the inner surfaces of both end portions of the mounting ring 10 by the thick portion 13 and the annular protrusion 15, and the elastic member 4 has the groove (prevention) at the time of the press-fitting. 11 and 11 bulging and deforming, thereby preventing the elastic member 4 from being detached from the mounting ring 10.

  The structure of the mounting ring according to the present invention is arbitrary as long as it has a retaining member that prevents the elastic member 4 from being detached on its inner surface. For example, various structures shown in FIGS. It can be in the form. Among them, FIG. 6A shows a rough shaped member 14 (FIG. 1) which is an intermediate body of the above embodiment as an attachment ring 10A as it is. In this case, tapered portions on both sides of the thick portion 13 ( Steps 40, 40 function as a retaining member for the elastic member 4. FIG. 5B shows that after a portion excluding one end portion in the axial direction of the cylindrical material is raised radially inward to form the thick portion 41, one end portion of the cylindrical material (coarse shape material) is directed in the radial inward direction. In this case, a groove 44 between the step 43 on one side of the thick part 41 and the annular protrusion 42 prevents the elastic member 4 from being pulled out. Function as. Further, FIG. 5C shows the mounting ring 10C, in which one end of the thick portion 41 is further raised in the radial inward direction to form an annular protrusion 45 to form the mounting ring 10C. In addition to the groove 44, the annular protrusion 45 functions as a retaining member for the elastic member 4.

  Further, in each of the above-described embodiments, the cylindrical material using a cylindrical material having a circular cross section is shown. However, the present invention is not limited to this, and for example, it is used for a cylindrical material that is close to an elliptical shape. You can also.

  Further, in each of the above-described embodiments, as the protrusion, an annular protrusion extending in an annular shape is shown at the end of the cylindrical material. However, the present invention is not limited to this, and the protrusion functions even if it is not annular. Therefore, a protrusion may be partially provided along the end of the cylindrical material.

It is sectional drawing which shows the attachment ring as one embodiment of this invention, and its manufacturing process. It is sectional drawing which shows the structure of the shaping | molding die for 1st processes for obtaining the rough shape material shown to FIG. 1 (B), and the set state of the cylindrical raw material with respect to this shaping | molding die. FIG. 3 is a cross-sectional view showing a final stage of molding by the mold shown in FIG. 2. It is sectional drawing which shows the structure of the shaping | molding die for 2nd processes for obtaining the attachment ring shown in FIG.1 (C), and the set state of the rough shape material with respect to this shaping | molding die. FIG. 5 is a cross-sectional view showing a final stage of molding by the mold shown in FIG. 4. It is sectional drawing which shows the various deformation | transformation structure of the attachment ring which concerns on this invention. It is sectional drawing which shows the attachment structure with respect to the apparatus main body of the conventional attachment ring, and a use condition.

Explanation of symbols

10, 10A to 10C Mounting ring 11 Groove (prevention)
12 Cylindrical material (tubular material)
13 Thick part (prevention)
14 Coarse shape material 15 Annular protrusion (protrusion)
20 Mold for the first step 30 Mold for the second step 40 Thick part difference (prevention)
44 Grooves between steps of thick-walled parts and protrusions (prevention)
45 Annular protrusion (protrusion, retaining)

Claims (7)

  An attachment ring having a retaining member for preventing the elastic member from being detached on an inner surface, wherein the retaining member is formed by compressing a cylindrical material in an axial direction.   The attachment ring according to claim 1, wherein the retaining portion comprises a step of a thick portion formed by raising an axially intermediate portion of the cylindrical material in a radially inward direction.   A retaining portion is formed by bulging the axial intermediate portion of the cylindrical material radially inward, and a protrusion formed by bulging both ends of the cylindrical material radially inward. The mounting ring according to claim 1, comprising a groove between the two.   By securing the step of the thick part formed by raising the portion of the cylindrical material excluding one end in the axial direction in the radial direction and by raising the one end of the cylindrical material in the radial direction The mounting ring according to claim 1, comprising a groove between the formed protrusion.   A method of manufacturing a mounting ring, comprising: compressing a cylindrical material in an axial direction and bulging an intermediate portion in the axial direction in a radially inward direction.   A first step of compressing the cylindrical material in the axial direction and bulging the axial intermediate portion radially inward, and compressing the cylindrical material after the first step in the axial direction again, And a second step of swelling in the radial inward direction. A first step of compressing the cylindrical material in the axial direction, and bulging the portion excluding one end in the axial direction in the radially inward direction; and compressing the cylindrical material after the first step in the axial direction again; And a second step of raising one end portion inward in the radial direction.

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