JPH05142254A - Production method for plunger for turn probe - Google Patents

Abstract

PURPOSE:To stabilize the goods quality and improve the accuracy of plunger by forming with grinding, the spiral part of rod element of a plunger for turn probe having the spiral part in the center. CONSTITUTION:An element M is ground by high speed revolution of grinders 1 and 2 facing to each other. The element M is a round rod fabricated on its light head 3. The grinders 1, 2 are attached to part A and slid revolving in high speed to the axial direction of the element M. When the gap between the grinder 1 and the grinder 2 reached a specified thickness of the spiral part 4, they are sent to traversing direction to the element M. Until the position of the grinders 1, 2 reaches the part B, the element M is rotated based on a specified spiral angle. The grinders 1, 2 are sent to let go outward and the grinding fabrication of the spiral part 4 is completed. Also, the spiral part can be formed by using one of the rotating grinders 1, 2 and applying it twice for grinding. The angle of spiral 4 can thus be selected freely, the angle can be formed uniformly, the goods quality is stabilized and the accuracy is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a plunger for a turn probe used for inspecting a hybrid IC and a printed wiring board.

[0002]

2. Description of the Related Art A turn probe 11 is, as shown in FIG. 2, an appropriate portion on a substrate 12 made of acrylic resin (that is, a portion corresponding to a portion to be inspected on a wiring board to be inspected).
A plurality of them, and the plunger 13 of each turn probe is pressed against the soldering surface 14 to bring its tip into contact with the soldering surface 14 for electrical continuity.
The other end is connected to an inspection circuit to perform an operation inspection of the soldered wiring board.

3 and 4 show the internal structure of the turn probe 11. A thin tube 17 having a constricted portion 16 is housed in a sheath tube 15, and a plunger 13 axially biased by a spring 18 is inserted in the thin tube 17. As shown in the enlarged view of FIG. 5, the plunger 13 has a spiral portion 19 and a pointed portion 20 that abuts against the portion to be inspected in the middle.
The spiral portion 19 is a portion that plays an important role in that the rotation generated in the plunger 13 operates uniformly and smoothly.

The method of processing the spiral portion 19 is as shown in FIGS.

First, as shown in FIG. 6, the material M is formed into a central portion 2
Cut so that 1 has a small diameter. Then, as shown in FIG. 7, the central portion 21 is pressed by the press P to form a flat plate shape as shown in FIG. Then, as shown in FIG. 9, a twisting force is applied to form the central portion 21 into the spiral portion 19.

[0006]

In practice, the spiral portion 19 of the turn probe plunger formed by the above-mentioned conventional method tends to have a non-uniform spiral angle. As shown in FIG. 10, ideally, the spiral angles at both ends A and B of the spiral part 19 and the central part C are as shown in the graph of FIG. 11, but in the case of the conventional method, For example, as shown in FIG. 12, the helix angles of the portions A and B are narrower than those of the portion C, and are not uniform as a whole.

When the turn probe is assembled using the plunger having such characteristics, the rotation of the plunger is not uniform and uneven. Further, when the space of the constricted portion 16 in FIG. 3 hits the portions A and B, the space is consumed and the spiral angle cannot be effectively used. That is, it is not efficient. This is because, when the central portion 21 is formed into a flat plate by the press P, the portions A and B are constricted as shown clearly in FIG. 8 and FIG. This is caused by the deviation of the twist angle.

Therefore, the present invention provides a processing method in which such a weak portion does not occur.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a tip corresponding to the spiral portion of a rod-shaped material of a turn probe plunger having a spiral portion in contact with a portion to be inspected and having a spiral portion in a central portion. It is a method for manufacturing a plunger for a turn probe, which is characterized by being formed by grinding.

Further, as a grinding process, a rotary grinding body facing the spiral portion is applied to start grinding, and if the distance between the facing rotary grinding bodies reaches a desired thickness of the spiral portion, a rod shape is formed. This is a method of forming a spiral portion by longitudinally feeding the material while rotating it axially.

Further, the rotary grinding body is provided on only one side, and the grinding is started by hitting the portion corresponding to the spiral portion of the rod-shaped material, and when the rotary grinding body reaches a position where the desired thickness of the spiral portion is left uncut, the rod-shaped material is formed. While rotating the shaft axially, grind to the end, return the rotary grinding body to the starting position, turn the rod-shaped material 180 ° from the starting position and position it, and repeat the same grinding as above. This is a method of forming a spiral portion by grinding.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the embodiment will be described with reference to the drawings.

FIG. 1 is a diagram showing an intermediate stage of processing. In FIG. 1, reference numerals 1 and 2 denote grinding bodies facing each other and rotate at a high speed to grind the material M. The material M is a round bar body obtained by processing the pre-prepared head 3 (may be processed later). First, the grinding bodies 1 and 2 are applied to the portion A, and the material M is laterally fed in the axial direction while rotating at high speed. When the distance between the grinding body 1 and the grinding body 2 reaches the designated thickness of the spiral portion, the material M is fed vertically. The material M is axially rotated based on the designated spiral angle until the positions of the grinding bodies 1 and 2 reach the portion B. At the portion B, the grinding bodies 1 and 2 are laterally fed outward and released, and the grinding of the spiral portion 4 is completed. As a result of measuring the grinding results, the relationship between the spiral length and the spiral angle was such that a plunger having an ideal shape as shown in FIG. 11 could be formed.

In the above-mentioned embodiment, the opposed rotary grinding bodies are used. However, the rotary grinding body may be formed only on one side and the grinding may be repeated twice to form the spiral portion.

[0015]

According to the method of the present invention, the angle of the spiral portion of the plunger can be freely selected, and molding can be performed so that the angle is uniform in each portion, and the quality is stabilized. Materials such as high speed tool steel and cemented carbide tool steel that cannot be pressed can be used for the plunger, and the accuracy of the plunger can be improved. Further, the product yield is improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an example of implementation of the present invention.

FIG. 2 is an explanatory diagram of a method of using a turn probe.

FIG. 3 is an explanatory diagram showing an internal structure of a turn probe.

FIG. 4 is a sectional view of a constricted portion of a turn probe.

FIG. 5 is a front view showing the shape of the plunger.

FIG. 6 is an explanatory view of a conventional material.

FIG. 7 is an explanatory view of pressing of a spiral portion in a conventional method.

FIG. 8 is a plan view of the spiral portion after pressing.

FIG. 9 is an explanatory diagram of a twisting process of a spiral portion.

FIG. 10 is an explanatory diagram of a forming state of a spiral portion.

FIG. 11 is a graph showing an ideal spiral angle.

FIG. 12 is a graph showing a spiral angle of a conventional example.

[Explanation of symbols]

 1 Grinding Body 2 Grinding Body 3 Spiral Head 4 Spiral Section 11 Turn Probe 12 Substrate 13 Plunger 14 Soldering Surface 15 Sheath Tube 16 Constricted Tube 17 Capillary Tube 18 Spring 19 Spiral Section 20 Spire 21 Central Section M Material P Press

Claims (3)

[Claims] 1. A portion of a rod-shaped material of a turn probe plunger having a spiral portion at its center, the portion corresponding to the spiral portion, is formed by grinding. And a method for manufacturing a plunger for a turn probe. 2. A rotary grinding body facing a portion corresponding to the spiral portion of a rod-shaped material of a turn probe plunger having a spiral portion at the center thereof, the tip being a pointed portion that abuts against a portion to be inspected. When the grinding is started and the distance between the opposing rotary grinding bodies reaches the desired thickness of the spiral portion, the rod-shaped material is longitudinally fed while being axially rotated, and the spiral portion is ground and shaped. Manufacturing method of plunger for turn probe. 3. A rotary grinding body is applied to a portion corresponding to the spiral portion of a rod-shaped material of a turn probe plunger having a spiral portion at the center thereof, the tip of which serves as a pointed portion that abuts against a portion to be inspected for grinding. When the rotary grinding body reaches the position where the desired thickness of the spiral portion is left uncut, the rod-shaped material is longitudinally fed while axially rotating, and is ground to the end, then the rotary grinding body is returned to the start position and rod-shaped. 180 from the starting position
A method for manufacturing a plunger for a turn probe, which is characterized in that the spiral portion is ground by forming the spiral portion by repeating the same grinding as described above.