JPS5927586A - Metal coating sensor - Google Patents

Abstract

PURPOSE:To obtain an inexpensive metal coating sensor which can endure against use as a stiff sensor by filling powder of the surface material of the sensor in a metal housing and plasticizing the entire metal housing. CONSTITUTION:Sensor material powder 2 is filled in a metal housing 1, and plasticized by rollers. In this case, the housing 1 and the filler 2 are plastically deformed by the dropping rate of the rollers, reduced in thickness, widened in width, with the result that the thickness 11 or diameter can become 0.02mm. or less. Since the outer surface is covered with metal even if thus reduced in thickness, it can not be readily cracked nor isolated. The workability can be improved by the use of material preferable for plasticizing and stainless steel of heat resistant alloy for the housing 1, annealing can be performed during the process by rollers, or dies, the binder of the powder is molten, secured to equalize the pressure and density so as to obtain preferable structure and to eliminate irregular performance. Metal wires such as tungsten are further buried in advance in the powder and filled in the housing, thereby similarly reducing in diameter and in stretching.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sensor in which the housing of the sensor is coated with metal.

Conventionally, the powder that was to become the element 4'A used in the sensor was compacted, heated to form a sintered body, and a metal wire for conducting electricity was adhered to this to make connections. be. The sintered bodies of conventional sensors such as these have uneven powder compaction accuracy,
Therefore, the density is averaged and the performance is not uniform.
Furthermore, it is difficult to produce a sintered body of less than 1 mm. Furthermore, even if the product is thin or minute, it is easily torn or damaged by vibration, shock, heat, etc. during handling. Furthermore, if the bonded portion of the current-carrying metal wire is minute, it is likely to easily come off, which often causes failure. The present invention corrects these points and further provides various distinctive advantages as described below.

The present invention will be described in detail. FIG. 1 to FIG. B are shape diagrams of an embodiment according to the present invention.

Reference numeral 1 in FIG. 1 is a metal case, which has a bottomed shape formed by deep drawing a single plate.

However, the shape of a welding table may also be used in some cases. Reference numeral 2 in FIG. 2 is powder that is to be filled into the metal box 61 in FIG. 1 and is the raw material for the sensor.

Figure 6 shows a state diagram in which the sensor material powder (2) is filled into the metal box (1) and the lid is covered, but does not need to be closed. . This embodiment is an example of a covered structure. 6 is a plastic working roller, and the metal box 1 in FIG. 1 and the filling 2 therein are plastically deformed as shown in 11 and 21 in FIG. becomes thinner and wider. The drawing operation and pressing operation using a die are similar, so the difference between processing using a die and a roller (not shown) is that the die is stretched and reduced in diameter, and the length increases by that amount, but the width does not increase. The thickness or diameter of this 11 can also be set to 0.002 mm or less.

Even if it is made extremely thin, the outer surface is coated with metal so it will not easily crack or fall off.Also, the metal box 1 is made of a material that has good plastic workability and is heat resistant. Workability is facilitated by using a steel alloy such as stainless steel. Furthermore, according to the present invention, when annealing is performed during processing with rollers, dies, etc., the filled binder of the sensor material powder melts and solidifies, resulting in uniform pressure, density, etc. This means that a uniform structure can be obtained and there will be less unevenness in performance.

This can be considered an advantageous feature not seen in the prior art. Furthermore, in the present invention, a heat-resistant current-carrying metal wire such as tungsten or molybran wire is embedded in the powder of the sensor material in advance, as shown in FIG. 4. Fill this into the metal box 1 in Figure 1, and use a roller, die, etc. to fill the metal box 1 with the sensor material powder 2 and the energizing material buried in 4. Both metal wires are reduced in diameter and drawn as shown in 41.

Its shape is shown in FIG. Next, the present invention partially changes the fall rate of the roller, the diameter reduction rate by the die or press, and the drawing rate when performing plastic working with these rollers, dies, etc.

This is because it is possible to mold the same product with different thicknesses, widths, and diameters of 1. the metal box, 2. the sensor material powder to be filled, and 4. the current-carrying metal wire. In this way, the performance of the powder that is the raw material for the sensor changes depending on its thickness, width, and diameter, making it possible to mold a variety of sensors at the same time. In other words, it is possible to use sensors that partially have diversity in performance. FIG. 7 shows an example of this, which is characterized by having different thicknesses such as 12 and 16 and having a step.

In the present invention, the current-carrying metal wire buried in the sensor can be taken out and used as a current-carrying terminal.
As shown in the figure, 42 current-carrying metal wires can be pulled out from 14 metal boxes and exposed to serve as current-carrying terminals.

This eliminates the need for the conventional welding connection process.

In addition, the present invention considers zinc oxide, germanium, silicon, iron oxide, titanium sambarium, manganese, nickel, cobalt, silicon, etc., as well as binder materials, as the powder material for the sensor. It is also possible to use cumulative moons other than 2nd magnitude. In addition, when these materials are heated and used as a sintered body, the material of the present invention can be sintered along with the metal surface during or after plastic working.

The present invention provides a housing manufacturing method for a sensor using an extremely thin metal case, which was previously impossible, and has made it possible to provide the market with a strong sensor that can withstand use at a low cost. It is something.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 8 are shape diagrams of an embodiment of the present invention. 1.11.12.15.14...Metal box. 2.21
... Senna material powder. 3... Laura. 4.41・
... Scrap gold wire for energizing. 42...Electricity terminal. Patent applicant Kiyoshi Kano

Claims (1)

[Scope of Claims] 1. A metal-coated sensor, characterized in that a metal box is filled with powder, which is the raw material of the sensor, and the metal box is subjected to plastic processing using a roller, die, press, or the like. 2. When filling a metal box with powder, which is the material for the sensor, and applying plastic processing to the metal box using rollers, dies, presses, etc., differences in drop rate, diameter reduction rate, squeezing rate, etc. A metal-coated sensor, characterized in that the metal-coated sensor is formed by plastic working together with the metal box according to claim 1, which has a stepped shape in thickness, width, etc., and is the same body. 3. A thin-walled metal box filled with powder that is the raw material for a sensor, and a metal wire for conducting electricity embedded in the powder, as defined in claim 1. A metal-coated sensor characterized by being formed by plastic processing.