JPS62104637A - Production of case with screw - Google Patents

Abstract

PURPOSE:To manufacture the case with screw which fits the male screw with a play flank inexpensively by forming the male screw with a play flank by pressing a screw forming die to the cylindrical body face having plural parallel opposing faces which is formed with the drawing or extrusion of a sheet metal. CONSTITUTION:The male screw 10 with a play flank 11e is formed by inserting the core metal jig 21 of which the diameter is expandable into the cylindrical body 11 having plural parallel opposing faces 11e which are formed with the drawing or extrusion of a sheet metal and having a flange 11b and skirt part 11c, and by pressing a screw forming die 23 to a cylindrical face 11a. This forming parts 10 is inserted into the case 1 hole and calked by expanding the diameter of the skirt part 11c. The case with screw can be manufactured with less man-hours and good material yield and the cost is reduced.

Description

Detailed Description of the Invention [Technical Field] The present invention relates to connectors installed in electronic devices such as integrated RF modulators for VTRs and RF switch boxes, or other electronic components (such as cylinders used in these). The present invention relates to a threaded case, and particularly relates to a method of manufacturing a threaded case in which a cylindrical body is formed at low cost and a male thread can be formed on the outer periphery of the cylindrical body in a simple process.

[Technical background and conventional technology]

The symbol l in FIGS. 12 and 13 indicates the integrated RF
It shows the frame of high-frequency equipment such as a modulator. A coaxial connector 2 is provided at the end of the frame 1 of this high-frequency device. A case surrounding the outer periphery of this type of connector 2 is formed with a male thread 2a that meets a predetermined standard. As shown in Figure 12, in high-end FM tuners and professional equipment, coaxial cables 3 and 3 are connected to high-frequency equipment.
A female thread 4a is formed in the connector 4 on the side, and the connector 4 is used by being connected to the connector 2. However, in high-frequency equipment that is installed as an accessory for commercially available VTRs and televisions, as shown in Figure 13, the connector 5 on the coaxial cable 3 side does not have a female thread, and only a pressure weld provided at the connection part is used. Generally, the structure is such that the portion 5a is crimped onto the outer periphery of the case of the connector 2 so that it can be attached and detached with a single touch.

[Problems with conventional technology]

Considering the above technical background, there is almost no possibility of using the male thread 2a formed on the outer case of the connector 2 in commercially available VTRs. It is extremely uneconomical to waste a lot of man-hours in machining the male thread 2a that is not available.

However, the outer peripheral case of the connector 2 installed in conventional actual equipment is machined from a metal material such as brass. Therefore, the processing cost of this case is extremely high, and since the inside of the bar must be hollowed out, the material yield is also poor.

Further, the male thread 2a on the outer periphery is also formed by cutting, but it is uneconomical to cut the male thread 2a, which is unlikely to be used in commercially available equipment, at a high cost.

Similarly, when threaded cases are used in electronic components other than connectors, the male threads are generally formed by cutting or rolling.
As mentioned above, it has the disadvantage of high cost.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned conventional problems, and it is possible to manufacture a cylindrical body at low cost, and also to easily and economically process a male thread on the outer periphery of the cylindrical body. The purpose of the present invention is to provide a method for manufacturing a threaded case.

[Summary of the invention]

In the present invention, a hollow cylindrical body is formed by a sheet metal drawing process or an extrusion process, and the outer surface of this cylindrical body has a threaded surface and a relief such as a plane that is shorter from the center than the threaded surface. It is characterized in that surfaces are formed at a plurality of locations and a pressure member having a thread stamping section is pressed against the thread forming surface of the cylindrical body to press a male thread on the thread forming surface.

In the present invention, a thread forming surface and a flank surface having a shorter distance from the center are formed on the outer surface of the cylinder, and a male thread is press-formed by applying pressure to the thread forming surface with a pressure member. , male threads can be formed easily and at low cost. In addition, since the outer surface other than the thread forming surface is used as a relief surface, when pressing a male thread onto each thread forming surface using two opposing pressurizing members, the threaded part of the male thread can be released by this relief surface. This eliminates the formation of discontinuous parts in the male thread, making it possible to form highly accurate male threads. Further, by forming the cylinder by drawing or extrusion, the cylinder itself can be formed at low cost.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 10.

Fig. 1 is a perspective view showing a coaxial connector as an example of a product using a threaded case manufactured by the manufacturing method of the present invention, Fig. 2 is a cross-sectional view thereof, and Figs. 3 to f:1.
The IJG drawings are a left end view, a half-section side view, a right end view showing the threaded case of the connector shown in FIG.
It is a Vl sectional view.

First, the structure of the connector 10 shown in FIGS. 1 and 2 will be explained.

The connector 10 shown in FIGS. 1 and 2 is installed in a frame 1 of a high frequency device such as an integrated RF modulator for a VTR. This connector 10 includes a cylindrical threaded case 11 manufactured by the manufacturing method of the present invention.
and a contact holding member 1 made of an insulating material provided therein.
2, and a metal contact 13 held by this contact holding member 12. As shown in Figure 2,
The threaded case 11 is caulked and fixed to the frame 1 of a high-frequency device. Further, the base end 13a of the contact 13 is connected to the substrate 1a inside the frame 1.

Next, a method for manufacturing the threaded case 11 and its structure will be explained.

As shown in Figure 3 (left end view), Figure 4 (half-section side view), Figure 5 (right end view), and Figure 6 (Vl-VT sectional view in Figure 4), The case 11 is made of a plate material such as a phosphor bronze plate.

In the manufacturing process of this threaded case 11, the cylindrical body 11a is formed by drawing. Furthermore, a flange flb and a cylindrical fixed base 11c are formed at the base of the cylinder 11a. The flange llb is formed by overlapping and folding a plate material as a raw material.

Further, on the outer surface of the cylinder 11a, as clearly shown in FIG.
A flank face lie is formed at a shorter distance from the center of the cylinder than 1d. The threaded surface lid is a portion of a cylinder. Further, the flank surfaces lie are formed into a machined surface shape at two locations facing each other with the center of the cylinder in between. The flank lie can be formed by pressing at the same time as or immediately after drawing the cylindrical body 11a.

Then, a male thread A is pressed onto the thread forming surface 11d of the cylindrical body 11a. This processing is performed by press working as shown in FIG. In this step, a jig 21 is inserted into the cylindrical body 11a, and another jig 22 is applied from the distal end direction of the cylindrical body 11a. This jig 22 is a cylindrical body 11a
The jig 21 is inserted into the opening at the tip of the jig 21 and fitted into the jig 21. In addition, as shown in FIG. 7, it is also possible to provide an abutting part shown by a dashed-dotted line on the outside of the jig 22, and to make the tip surface of the cylindrical body 11a contact the abutting part shown by the dashed-dotted line. . A plane part 21a is formed on the jig 21,
This flat portion 21a comes to oppose the flank surface lie of the cylindrical body 11a. For the press of male screw A, there are symbols 23a and 2.
A pressure member designated 3b is used. Each pressure member 23
a and 23b have threaded stamped portions B. Thread stamping part B
is formed into a concave shape, and two pressure members 23a and 23
When the molds B are matched, the threaded stamped portions B are connected in a cylindrical shape. Thread stamped portion B of pressure members 23a and 23b
is pressurized to the thread forming surface 11d of the cylindrical body 11a, thereby press forming the male thread A on the thread forming surface Ltd.

At this time, the mating portions of the threaded stamped portions B of the pressure members 23a and 23b are located on the flank surface 1iek of the cylindrical body L1'a. Therefore, the mating part of the thread stamped part B is the male thread A.
This means that the connecting portion of the male thread A is not stamped on the outer periphery of the cylindrical body 11a. Further, it is also possible to perform the step of forming the flank surface lie on the cylinder body 11a and the machining of the external thread A in succession. In this case, the jigs 21 and 22 shown in FIG. 7 are attached to the cylindrical body 11a, and a planar punch is applied to the planar parts 21a and 22a of each of the jigs 21 and 22. , a flank surface 11e is press-molded on the cylinder 11a. Immediately thereafter, the male thread A is press-formed by the pressure members 23a and 23b.

The connector 10 shown in FIGS. 1 and 2 is assembled using the threaded case 11 manufactured in this manner.

When assembling this connector 10 to the frame 1 of a high-frequency device, the flange 11b is brought into contact with the outer peripheral surface of the frame 1, and the fixed base 11c is caulked to the inner surface of the frame 1 to fix it. do. Note that this fixed base lie is connected to the frame 1.
It is also possible to solder the inner surface of the

FIG. 8 shows a second embodiment of the invention.

In this embodiment, a frame 11f of a main body of a device such as a high frequency device is used.
The cylindrical body 11 (the one that protrudes from the frame l in Fig. 2)
A is integrally drawn and formed. The shape of the cylindrical body 11a is the same as that shown in FIGS. 3 to 6.

9 to 11 show a third embodiment of the present invention.

The threaded case 15 for a connector manufactured according to this embodiment is formed by drawing with a phosphor bronze plate or the like, similar to the case shown in FIG. ing. Then, flank surfaces 15e are press-formed at four locations on the cylinder 15a. As a result, four thread forming surfaces 15d on which the male threads A are pressed are formed on the outer periphery of the cylinder 15a.

In the illustrated embodiment, the cylindrical bodies 11a and 15a are formed by drawing a sheet metal, but they may also be formed by extrusion.In this case, the cylindrical bodies 11a and 15a extruded from the die have a The surfaces lie and 15e can be press-formed, or the flank surfaces lie and tse can be formed together with the threaded surfaces 11cl and 15d in an extrusion process using a die.

Further, the number of escape holes and 15e is not limited to two or four, but three may be provided on the outer periphery of the cylindrical bodies 11a and 15a.

Furthermore, it is also possible to draw or extrude the cylindrical body so that the cross section is elliptical, and use the part with the largest radius of this ellipse as the threaded surface and the other parts with shorter radii as the flanks. be.

Furthermore, the threaded case manufactured according to the present invention is not limited to being used for connectors, but can be widely used for other electronic parts and other parts that have a male thread on the outer periphery of the cylinder. It is something.

〔Effect of the invention〕

As described above, according to the present invention, the following effects can be achieved.

(1) Since the male thread on the outer surface of the cylindrical body is press-formed using a pressure member, it can be formed easily and at a lower cost than the conventional thread-cutting process.

(2) The cylindrical body has a thread forming surface and a flank surface that is shorter from the center than this, so when pressing a male thread with a pressure member, the thread impression part of the pressure member The mating part will now be located on the flank surface. Therefore, a joint portion of the male thread is not formed on the outer surface of the cylindrical body, and a highly accurate male thread can be press-molded. As stated in claim 4, if the relief surfaces are two planes facing each other, the mating portion of the thread stamped portion of the pressure member can be reliably escaped by the relief surfaces. .

(3) As stated in claims 2 and 3, if the cylindrical body of the threaded case is formed by drawing or extrusion, the cost of forming the cylindrical body itself can be reduced. This makes it possible to manufacture the product at a lower cost overall.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a connector as an example of a product having a threaded case manufactured by the wood invention, Fig. 2 is a sectional view thereof, and Fig. 3 is a method for manufacturing the threaded case of the connector shown in Fig. 1. and left end view showing the structure, No. 4
The figure is a half-sectional side view, FIG. 5 is a right end view, FIG. 6 is a sectional view taken along the line ■-■ in FIG. 4, and FIG. Figure 8 is a half-sectional side view showing a method for manufacturing a threaded case according to the second embodiment of the present invention and a horizontal core, and Figure 9 is a left end diagram showing the method and structure for manufacturing a threaded case according to the third embodiment of the invention. 101i4 is a side view in half cross section, FIG. 11 is a right end view thereof, and FIGS. 12 and 13 are side views showing the connected state of a connector installed in a high frequency device. 1... Frame of high frequency equipment, 10... Connector, 11
．． 15... Threaded case, lla, 15a... cylinder, llb, 15b... flange, lid, 15d.
... Thread forming surface, A... Male thread, lle, 15e...
- Sad face, 12... Contact holding member, 13... Contact. Agent: Patent attorney Teruo Nozaki F, T Kasaj: J1.
H 11e 11d Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (5)

[Claims] (1) A hollow cylindrical body is formed, and a threaded surface and a plurality of relief surfaces shorter from the center than the threaded surface are formed on the outer surface of the cylindrical body, and a threaded stamped portion is formed. A method for manufacturing a threaded case, in which a pressure member is pressed against a threaded surface of a cylindrical body, and a male thread is press-formed on the threaded surface. (2) The method for manufacturing a threaded case according to claim 1, wherein the cylindrical body is drawn using a sheet metal. (3) The method for manufacturing a threaded case according to claim 1, wherein the cylindrical body is extruded. (4) The method for manufacturing a threaded case according to claim 1, wherein the flanks are two planes facing each other with the center of the cylinder in between. (5) The method for manufacturing a threaded case according to claim 1, wherein the cylindrical body has an elliptical cross section, and the outer surface with a short radius from the center of the cylindrical body serves as a relief surface.