JPH044939A - Method for forming intermediate joint fitting for hydraulic piping or the like - Google Patents

Abstract

PURPOSE:To improve the workability and productivity by bulging a flange in the flat shape it as an axial part and an axial hole in the axial part are formed from a billet cut to a prescribed length through cold forming. CONSTITUTION:Piercing is performed by a header to a billet W1 at a prescribed depth from both end faces in the axial direction to obtain a primary preform W2, and bonderizing treatment, etc., is executed for lubrication in a pressing time after it is annealed. Further, the axial part S1 and axial hole part H1 are formed by pressing further deeply and, at the same time, a flange part F1 thicker than the flange F of an intermediate joint fitting W os bulged in the direction crossed orthogonally with the axial direction to obtain a primary preform W3. Further, a flange part F2 and the hole part H2 of a stepped axis Z are formed by a press apparatus to obtain a secondary preform W4. Further. a hole for mounting a bolt is made and trimming is performed. Then, a hole H3 for passing an intermediate tube is cut by a lathe, etc., and an intermediate tube is fixed by brazing, etc., in the hole H3.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a method for forming an intermediate joint fitting for hydraulic piping, etc. Specifically, the present invention relates to a method for forming an intermediate joint fitting for hydraulic piping, etc. This invention relates to a method of forming an intermediate joint fitting in which a flange for fixing the fitting is bulged out in a flat shape on one side of the part in a direction perpendicular to the axis thereof.

(Prior Art) Generally, as shown in FIG. 5, this type of intermediate joint fitting W has a shaft portion S having a shaft hole H, and an outer circumference of the shaft portion S that is perpendicular to the axis of the shaft portion S. The structure includes a flat flange F that bulges in the direction of As shown in FIGS. 6A to 6F, first, a bar-shaped material Wa is cut into a predetermined length using a burn former of an automatic forging press, and then the bar-shaped material Wa is placed against the shaft portion at a portion corresponding to the flange. The flange is pre-upset-formed to a desired thickness (see Fig. 6B), and then the flange is formed into a flat shape using a press machine, and holes for attaching bolts to the flange are processed and trimmed. (see FIGS. 6C and D) to form an intermediate molded product wb. Then, a shaft hole is machined in the axial direction of the shaft portion of the intermediate molded product wb, for example, by cutting it into a stepped bow shape using a lathe. Processing (see 61st EIE),
The method of fixing the inner pipe to the stepped hole of the shaft portion by brazing or caulking (see FIG. 6F) has mainly been adopted.

(Problems to be Solved by the Invention) However, since the method described above involves press working to form the flange and machining to form the stepped thank-you note on the shaft, Inevitably, the machining process becomes complicated and a considerable amount of machining time is required, resulting in deterioration of workability and productivity.

Therefore, in view of the above-mentioned conventional problems, the present invention is an intermediate joint fitting for hydraulic piping, which is capable of simplifying the machining process and shortening the machining time, thereby improving workability and productivity. The purpose of this invention is to provide a molding method.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides an intermediate joint fitting for hydraulic piping, which has a flat flange bulged in a direction perpendicular to the axis of the shaft. The gist is that during the forming, the flange is squeezed into a flat shape while forming the shaft portion and the shaft hole in the shaft portion by cold forming from a rod-shaped material cut to a predetermined length. do.

(Function) According to the present invention, the shaft portion and the shaft hole in the shaft portion are formed by cold forming, and at the same time, the flange is drawn and expanded into a flat shape.

(Example) Hereinafter, one embodiment of the method of the present invention will be described in detail with reference to the drawings.

First, as shown in FIG. 1A, a long round bar-shaped material made of a desired material is cut into a predetermined size by an appropriate cutting means to obtain a bar-shaped material W.

Next, a hole having a predetermined depth is formed in the axial direction from both end surfaces of the rod-shaped material W1 using a header to obtain a primary molded material W. (See Fig. 1C.) Regarding molding using this header, as shown in Figs. A shaft hole H of a predetermined depth corresponding to the shaft hole H of the intermediate joint fitting W to be formed by pressing and pressing from both sides with the punch 3, the counter bunch 4 on the other side, and the collar knockout 5 on the outer periphery. ,,H, are formed on both ends of the primary molded material W.

is formed.

Next, the primary material W is taken out from the die 2 of the header 1 by the extrusion operation of the collar knockout 5, and the next molded product W is annealed, and the surface of the next molded product W is subjected to a process described below. Surface treatment, such as bonding treatment, is applied to provide lubrication during press working.

Thereafter, the annealed and surface-treated primary forming material W is press-worked to form the shaft portion S1 corresponding to the shaft portion S of the intermediate joint fitting W and the shaft six portion H1 corresponding to its shaft hole H more deeply. At the same time, the flange portion F, which is thicker than the flange F of the intermediate joint fitting W, is drawn and expanded in one direction perpendicular to the axial direction of the shaft portion SI to obtain a primary molded product Ws. (See FIG. 1C) As shown in FIGS. 3A and 3B, the press device 6 used for this press processing is used to separate the mold surface from which the flange portion F is formed on the mold mating surface, and the mold surface from which the flange portion F is formed on the mold mating surface. A lower mold 7 and an upper mold 8 that move vertically and have mold surfaces forming the shaft portion SI in the vertical direction, and further the shaft portion S of the lower mold 7 and the upper mold 8,
It is comprised of a pin 9.10 which protrudes and retracts into the mold surface forming the shaft hole H5, and a cylindrical pin 11, 12 which sets the length of the shaft S1.

The molding by this press device 6 is performed by the above-mentioned -order shape material W,
After setting the shaft portion S1 of the lower mold 7 and the upper mold 8 in the mold surface forming the shaft portion S1, the lower mold 7 and the upper mold 8 are moved up and down to press the mold mating surfaces, and the pins are 9.10
are pressed in the vertical direction, respectively, and a shaft hole portion H corresponding to the shaft hole H is deeply pressed from both ends of the primary molded product W2 using the pins 9 and 10. When the shaft hole portion H1 is formed by the pins 9 and 10, a part of the approximately central portion of the primary molding material W is pushed out into the mold surface forming the flange portion F on the mold mating surface. The flange portion F having a predetermined thickness along the surface is drawn and expanded (upset molding). Further, the shaft portions S1 also tend to extend in the vertical direction along the mold surfaces of the lower mold 7 and the upper mold 8, respectively, but this is restricted to a predetermined length by the cylindrical pins 11 and 12.

Here, a shaft portion S1 with a length corresponding to the shaft portion S of the intermediate joint fitting W, a shaft hole portion H corresponding to the shaft hole H thereof, and a predetermined flange F of the intermediate joint fitting W at the same time. A primary molded product W is obtained in which the thick flange portion F1 is squeezed and expanded in one direction perpendicular to the axial direction of the shaft portion SI. In this case, a thick wall portion of a predetermined size is left in the middle portion of the shaft hole portion H, which corresponds to the shaft hole H.

Next, the primary molded product W is produced from the press device 6.

After taking out, as shown in FIG. 4, only the lower mold 7, upper mold 8 and pins 9 and 10 of the press device 6 were changed.
That is, the flange of the intermediate joint fitting W is pressed by a press device 13 in which the mold surfaces of the lower die 7a and the upper die 8a are made the same as the outer contour of the intermediate joint fitting W, and the pins 9a and 10a are made the same as the shaft hole H of the intermediate joint fitting W. A flange portion F2 with a thickness corresponding to F and a stepped shaft hole portion H corresponding to its shaft hole H.
3 to obtain a secondary molded product W4. (See Figure 1.) Furthermore, when assembling the flange portion F of the secondary molded product W4 using a press machine, holes for bolt attachment are drilled and trimmed 6 (see Figure 1 E). m) After that, the secondary molded product W4 is taken out from the press device, and a hole H8 for inserting the middle vibrator is cut into the shaft hole H3 of the secondary molded product W4 using a machine such as a lathe. (See FIG. 1F) After that, the inner pipe is fixed to the hole H1 of the H2 hole of the shaft hole portion by brazing or caulking means.

Here, the intermediate joint fitting W shown in FIG. 5 is molded.

In addition, the removal and setting of the rod-shaped material W7, the fire-formed material W5, the secondary molded product W1, and the secondary molded product W4 in each of the above steps can be performed by a robot.

Furthermore, the shape of the flange F of the intermediate joint fitting W is not limited to that shown in the drawings.

(Effects of the Invention) As described above, according to the present invention, in forming an intermediate joint fitting for hydraulic piping, etc., in which a flat flange is bulged in a direction perpendicular to the axis of the shaft part, The flange was expanded into a flat shape while forming the shaft part and the shaft hole in the shaft part by cold forming from a rod-shaped material cut to a length of . The expansion and contraction of the flat flange can be performed at the same time.

This differs from conventional machining of shaft holes by cutting, which simplifies the machining process and reduces machining time, thereby improving workability and productivity. be able to.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIGS. 1A to 1F are explanatory diagrams showing the molding process of the present method, FIGS. 2A to C are explanatory diagrams showing the molding process using Heragu, B is a sectional view of the press device showing the process of obtaining a primary molded product, 4th ryJ is a sectional view of the press device also showing the process of obtaining a secondary molded product, FIG. 5 is a perspective view showing the intermediate joint fitting, and 6th Figures A-F
FIG. 2 is an explanatory diagram showing a conventional molding process. W...Intermediate joint fitting S...Shaft part Sl...Shaft part 7°8.8a...Upper mold 9°10.10a...Upper mold pin H...Shaft hole Hl...・Shaft hole portion 7a...Lower mold 9a...Pin of lower mold Patent applicant Nagoya Giken Kogyo Co., Ltd. Agent Patent attorney Yoshi Shimizu Hisaiko Figure B Figure C Figure Figure A Figure Figure Figure Figure Figure F

Claims (1)

[Claims] In forming an intermediate joint fitting for hydraulic piping, which has a flat flange bulging out in a direction perpendicular to the axis of the shaft, the above-mentioned material is cold-formed from a rod-shaped material cut to a predetermined length. A method for forming an intermediate joint fitting for hydraulic piping, characterized in that the flange is expanded into a flat shape while forming the shaft portion and the shaft hole in the shaft portion.