JP2007175753A - Method of forming engaging groove in metallic part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing metallic parts for efficiently and economically manufacturing the metallic parts which can be mounted so as not to be freely detached and rotated on an end part of a tubular body such as a tubular body for supporting load, in particular, an efficiently and economically performable method of forming an engaging groove of the metallic parts. <P>SOLUTION: The method of forming the engaging groove on the outer circumferential surface of the metallic parts is characterized in that a cylindrical or columnar metallic main body 14 is drawn, projected and recessed parts 16 which are extended axially are formed on the whole outer circumferential surface, and, after that, a circumferential-direction groove 18 is form-rolled by pressing the projected line 16a of the projected and recessed parts 16 to the side of a recessed line 16b in a prescribed position in the axial direction of the outer circumferential surface in the main body 14. By such constitution, the metallic parts 10 is efficiently and economically manufactured which is mounted so as not to be freely detached and rotated on the end part of the tubular body for supporting the load. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention mainly relates to a method for manufacturing a metal part attached to an end portion of a tube body such as a load supporting tube, and more particularly to a method for forming an engagement groove formed on an outer peripheral surface of a cylindrical or columnar metal part. .

  Conventionally, a metal part is attached to an end portion of a load-supporting tube body such as a floor load support column in order to reinforce the end portion and contribute to the attachment of the tube body.

  As an example of such a metal component, it has a metal bush 7 as shown in FIG. 6, that is, a hollow cylindrical main body 1, and a flange 3 is formed at one end of the main body 1. There are some in which annular recesses 5 are formed in a plurality of rows in the axial direction (for example, see Patent Document 1).

When the bush 7 is used by being attached to the load supporting tube 9, first, the bush 7 is inserted into the end 9 a of the tube 9, and then the bush 7 is inserted from the outside of the tube 9. The inserted end portion 9 a is pressed to caulk the end portion 9 a to the recess 5. By doing so, the concave portion 5 functions as an engagement groove, and the metal bush 7 can be attached to the end portion 9a of the load supporting tube body 9 so as not to be detached.
JP 2000-73530 A

  However, the bush 7 in which only the annular recess 5 is formed on the outer peripheral surface of the main body 1 can be attached to the end portion 9a of the load supporting tube body 9 as described above, but cannot rotate. It was difficult to put on. For this reason, for example, when the bush 7 must be mounted on the end portion 9a of the tube body 9 in a non-rotatable manner, for example, when a nut member is mounted on the bush 7, some measures for stopping the rotation of the bush 7 must be taken separately. There was a problem that it was troublesome.

  Further, when manufacturing the bush 7 in which the annular recess 5 is provided on the outer peripheral surface of the hollow cylindrical main body 1 in this way, generally, a cutting process with a small processing stress in the radial direction of the main body 1 is used. However, in such a processing method, although the concave portion 5 can be formed with high dimensional accuracy, cutting waste is generated, the material is wasted, and the processing speed is slow. There was a problem that it was difficult to manufacture (metal parts).

  Therefore, the main object of the present invention is to efficiently and economically manufacture a metal part that can be attached in a non-detachable and non-rotatable manner when attached to an end of a pipe body such as a load supporting pipe body. It is an object of the present invention to provide a method for manufacturing a metal part, particularly a method for forming an engagement groove in a metal part that can be carried out efficiently and economically.

  The invention described in claim 1 is “a method of forming an engagement groove on the outer peripheral surface of the metal part 10 to be mounted on the end portion of the tube body 12, wherein the cylindrical or columnar metal main body 14 is squeezed. The unevenness 16 extending in the axial direction is formed on the entire outer peripheral surface of the outer peripheral surface, and then the convex strip 16a of the concave / convex 16 is pressed toward the concave strip 16b at a predetermined axial position on the outer peripheral surface of the main body 14. This is a method of forming an engaging groove, characterized in that the circumferential groove 18 is rolled.

  In the method of forming the engagement groove according to the present invention, first, the cylindrical or columnar metal main body 14 is drawn to form the irregularities 16 extending in the axial direction on the entire outer peripheral surface thereof. Thus, when the metal part 10 is press-fitted or inserted into the end portion 12a of the tubular body 12 by caulking the metal part 10 to the entire outer peripheral surface of the cylindrical or columnar body 14 in the axial direction, the irregularities The end 12a of the tube body 12 is fitted into the 16 concave strips 16b, so that the metal part 10 mounted on the end 12a of the tube body 12 can be made non-rotatable. That is, the unevenness 16 functions as an engagement groove that prevents rotation of the metal part attached to the tube body 12.

  Then, at a predetermined position in the axial direction of the outer peripheral surface of the main body 14, the ridge 16 a of the concavo-convex 16 is pressed toward the dent 16 b (in other words, the ridge 16 a is pushed into the recess 16 b), and the circumferential groove 18. Roll.

  Here, the rolling process has a larger processing stress (pressure) acting in the radial direction of the workpiece during machining than the cutting process. If an attempt is made to form a circumferential groove, an excessive processing stress is applied in the radial direction of the workpiece, the workpiece is crushed in the radial direction, the inner diameter is deformed, and a hollow cylindrical shape cannot be maintained. There was a problem. However, in the manufacturing method of the metal bush 10 according to the present invention, the unevenness 16 is provided in advance on the entire outer peripheral surface of the hollow cylindrical main body 14, and when the rolling process is performed, the thin protrusion 16a of the unevenness 16 is placed on the recess 16b side. Since the pressing is performed, the circumferential groove 18 is formed with an extremely weak processing pressure as compared with the case of rolling the circumferential groove directly on the outer peripheral surface of the workpiece without providing such an unevenness 16. Can do. As a result, the processing stress applied in the radial direction of the main body 14 can be reduced, and the shape of the hollow cylindrical main body 14 can be prevented from being deformed by the processing stress during rolling.

  In particular, as described in claim 2, when the circumferential groove 18 is rolled by pressing the protrusion 16a toward the recess 16b, the volume of the protrusion 16a pushed into the recess 16b is plastically deformed. Even if the main body 14 has a relatively thin hollow cylindrical shape, the outer peripheral surface of the main body 14 can be deformed without deforming the inner diameter. The circumferential groove 18 can be rolled.

  By forming such a circumferential groove 18, when the metal part 10 is inserted into the end portion 12 a of the tube body 12 and caulked, the end portion 12 a of the tube body 12 is fitted into the circumferential groove 18. Thus, the metal bush 10 attached to the end 12a of the tube body 12 can be made undetachable.

  According to the manufacturing method of the present invention, an unevenness extending in the axial direction is formed by drawing on the entire outer peripheral surface of a cylindrical or columnar main body, and then a circumferential groove is rolled on the outer peripheral surface of the main body. In other words, when metal parts are formed, all processing is performed by plastic processing, so that cutting waste is not generated and material waste is prevented, and metal parts are manufactured efficiently and economically at a high processing speed. be able to.

  Further, when rolling the circumferential groove by pressing the ridge to the ridge side, the volume of the ridge pushed into the groove is equal to or less than the volume of the groove that accommodates the plastically deformed ridge. By doing so, even if the main body has a relatively thin hollow cylindrical shape, the circumferential groove can be rolled on the outer peripheral surface without deforming the inner diameter.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram illustrating a usage mode of a metal bush 10A which is an embodiment of a metal component 10 manufactured by the manufacturing method of the present invention. As shown in this figure, the metal bush 10A of this embodiment is attached to an end portion 12a of a load-supporting tube body 12 such as a floor load support column, reinforces the end portion 12a, and is a load-supporting tube body. 12 to contribute to the installation of 12.

  FIG. 2 is a perspective view showing a metal bush 10A according to an embodiment of the present invention. As shown in this figure, the metal bush 10A of the present invention is generally composed of a main body 14, irregularities 16, a circumferential groove 18 and a flange portion 20.

  The main body 14 is made of a metal such as steel, stainless steel, brass, copper, aluminum and titanium having an elongation of 5% or more or a hardness of less than 40 ° HRC (that is, particularly capable of plastic working), and is a load-supporting tube. It is a hollow cylindrical member inserted into the end 12 a of the body 12. On the outer peripheral surface of the main body 14, unevenness 16 extending in the axial direction is formed at a predetermined pitch on the entire outer peripheral surface, and at a predetermined position in the axial direction (in the case of the present embodiment, a substantially central portion in the axial direction). Directional grooves 18 are formed. A flange 20 is formed at one end of the main body 14 in the axial direction.

  The unevenness 16 is crimped by inserting the metal bush 10A into the end portion 12a of the load supporting tube 12 (when the outer diameter of the metal bush 10A is slightly larger than the inner diameter of the tube 12) or inserting the metal bush 10A (of the metal bush 10A). When the outer diameter is slightly smaller than the inner diameter of the tubular body 12, a part of the tubular body 12 is fitted so that the metal bush 10A attached to the end portion 12a cannot rotate, that is, the engaging groove. It is comprised by the convex strip 16a extended in the axial direction of the main body 14, and the concave strip 16b adjacent and parallel to this.

  When the metal bush 10A is inserted into the end portion 12a of the load supporting tube body 12 and caulked, the circumferential groove 18 is inserted into the end portion 12a so that a part of the tube body 12 is fitted into the metal bush 10A. Is made impossible to detach, that is, functions as an engagement groove.

  The circumferential groove 18 is formed by pushing the ridge 16a of the concavo-convex 16 into the concave 16b side at a predetermined position in the axial direction of the main body 14, and the volume of the ridge 16a pushed into the groove 16b is as follows. It is comprised so that it may become below equal to the volume of the concave 16b which accommodates the plastically deformed convex 16a. That is, when the shape of the concavo-convex 16 is constant in the main body axial direction, as shown in FIG. 4, the cross-sectional area S1 in the main body 14 radial direction of the ridge 16a pushed into the concave ridge 16b is the ridge 16a. It is made to become below the equivalent of the cross-sectional area S2 of the main body 14 radial direction of the groove 16b which accommodates. In addition, the arrow d in FIG. 4 has shown the direction where pressing force is added with respect to the protruding item | line 16a when performing the rolling process mentioned later.

  The flange portion 20 abuts the tip of the end portion 12a so that the metal bush 10A is not inserted deep inside the load supporting tube 12 when the metal bush 10A is inserted into the end 12a of the load supporting tube 12. In addition, the tip of the load supporting tube 12 is protected. In the present embodiment, the outer peripheral surface of the main body 14 is used as one side wall, and an outer peripheral groove 20a that accommodates the tip of the load supporting tube 12 is provided.

  Next, with reference to FIG. 5, the manufacturing method of the metal bush 10A of a present Example is demonstrated. When manufacturing the metal bush 10A of the present embodiment, first, a metal rod wire is cut into a predetermined length, and this is subjected to forging using a cold forging machine such as a former, and the main body 14 A hollow cylindrical metal short tube 14a having a predetermined size is formed (FIG. 5A). The metal short tube 14 a is drawn to form a flange 20 at one end in the axial direction of the main body 14, and an unevenness 16 extending in the axial direction is formed on the entire outer peripheral surface of the main body 14. Thereby, the basic shape of the metal bush 10 is completed (FIG. 5B). In addition, each process from the cutting | disconnection of the rod wire mentioned above to formation of the unevenness | corrugation 16 may be continuously performed with one apparatus, and may be performed with an apparatus separate for each process.

  Then, the convex strip 16a of the concave and convex portion 16 is pressed toward the concave strip 16b toward a predetermined position in the axial direction of the main body 14 provided with the concave and convex portion 16 and the flange portion 20 (in this embodiment, the central portion in the axial direction). The direction groove 18 is rolled. Thereby, the metal bush 10A of the present embodiment is completed (FIG. 5C).

  Here, when rolling the circumferential groove 18 on the outer peripheral surface of the main body 14, it is possible to use a rolling machine equipped with a rotary rolling die that is a combination of a segment die and a round die. Is preferable. In the rolling machine equipped with this rotary type rolling die, the thin convexity formed on the outer peripheral surface of the main body 14 while the main body 14 rolls in a planetary motion between the fixed segment die and the rotating round die. The strip 16a is pressed toward the concave strip 16b, and the circumferential strip 18 is formed by plastic deformation so that the convex strip 16a fills the concave strip 16b.

  Before or after rolling the circumferential groove 18, a female screw (not shown) may be formed on the inner peripheral surface of the main body 14 as necessary.

  When the metal bush 10A manufactured by the above method is used, the metal bush 10A is inserted into the end 12a of the load supporting tube 12, and the end of the tube 12 into which the metal bush 10A is inserted. 12a is pressed from the outside and caulked. By doing so, the end 12a of the load supporting tube 12 is fitted into the irregularities 16 and the circumferential groove 18 (see FIG. 1), and the load supporting tube is in a state in which the metal bush 10A cannot be detached and cannot be rotated. It is attached to 12 end portions 12a.

  According to the manufacturing method of the metal bush 10A of the present embodiment, the unevenness 16 is provided in advance on the entire outer peripheral surface of the hollow cylindrical main body 14, and the thin protrusion 16a of the unevenness 16 is pressed toward the recess 16b. Since the circumferential groove 18 is rolled, the circumferential groove 18 is formed with a very weak working pressure compared to the case where the circumferential groove is rolled directly on the outer peripheral surface of the workpiece without providing such irregularities 16. Can be formed. As a result, the processing stress applied in the radial direction of the main body 14 can be reduced, and the shape of the hollow cylindrical main body 14 can be prevented from being deformed by the processing stress during rolling. In particular, when rolling the circumferential groove 18 by pressing the ridge 16a toward the ridge 16b, the volume of the ridge 16a that is pushed into the groove 16b is the groove that accommodates the plastically deformed ridge 16a. Even if the main body 14 has a relatively thin hollow cylindrical shape, the circumferential groove 18 is rolled on the outer peripheral surface without deforming the inner diameter by making the volume equal to or less than the volume of 16b. Can do.

  In addition, an unevenness 16 extending in the axial direction is provided on the entire outer peripheral surface of the hollow cylindrical main body 14 by drawing, and a flange portion 20 is provided at one end in the axial direction of the main body 14. Since the circumferential groove 18 is rolled, that is, the metal bush 10A is all formed by plastic processing, cutting waste is not generated, and waste of material can be prevented, which is efficient and economical at a high processing speed. The metal bush 10A can be manufactured. Further, unlike the metal bush 10A obtained by this method, the fiber flow (fibrous metal structure) is not cut and the surface to be processed is compositionally hardened, which is mechanical. High strength.

  In the above-described example, the case where one circumferential groove 18 is formed in the central portion in the axial direction on the outer peripheral surface of the main body 14 is shown, but the position where the circumferential groove 18 is formed is not limited to the above case, Two or more circumferential grooves 18 may be formed on the outer peripheral surface of the main body 14.

  Moreover, in the above-mentioned embodiment, the case where the main body 14 is a hollow cylindrical metal bush 10A as the metal part 10 is shown, but the metal part 10 manufactured by the method of the present invention is not limited to this, For example, a solid cylinder (not shown) is used as a main body, a male screw is formed at one end of the main body in the axial direction, and an unevenness extending in the axial direction is formed on the entire outer peripheral surface. The groove may be formed by pressing the strip toward the concave strip to roll the circumferential groove and using these (unevenness and circumferential groove) as engagement grooves.

It is a fragmentary sectional view which shows the usage condition of the metal bush of this invention. It is a perspective view which shows the metal bush of one Example of this invention. It is the top view and front fragmentary sectional view which show the metal bush of one Example of this invention. It is the sectional view on the AA line in FIG. It is the schematic which shows the manufacturing apparatus of the electrolytic copper foil which comprises a main body. It is a fragmentary sectional view which shows the usage condition of the conventional metal bush.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Metal part 10A ... Metal bush 12 ... Load support pipe body 12a ... End part (of load support pipe body) 14 ... Main body 16 ... Concavity and convexity 16a ... Convex line 16b ... Concave line 18 ... Circumferential groove 20 ... Gutter part 20a ... outer peripheral groove

Claims (2)

A method of forming an engagement groove on an outer peripheral surface of a metal part to be attached to an end of a tubular body,
A cylindrical or columnar metal main body is drawn to form an unevenness extending in the axial direction on the entire outer peripheral surface,
After that, the engagement groove forming method characterized by rolling the circumferential groove by pressing the concave and convex ridges toward the concave stripe side at a predetermined axial position on the outer peripheral surface of the main body. When rolling the circumferential groove by pressing the ridge against the ridge side, the volume of the ridge pushed into the groove is equivalent to the volume of the groove containing the plastically deformed ridge. The method for forming an engagement groove according to claim 1, wherein:

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