JP2001174453A - Device and method for measuring residual adhesion oil content - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for measuring residual adhesion oil content that safely and accurately measures oil content that remains in and adheres to in a small amount parts where oil that has adhered in machining has been eliminated. SOLUTION: A silica tube 10 accommodating a sample of parts where oil that has adhered in machining is wiped off is carried into a heating oven 4 whose temperature has been increased to 1,000 deg.C. The silica tube 10 is connected to a tetrad bag 20 to collect carbon monoxide being generated while the sample is being heated. The silica tube 10 is air-cooled and then is water-cooled for cooling to normal temperatures, and the carbon monoxide is returned from the tetrad bag 20 to the silica tube 10. Then, the tetrad bag 20 is removed from the silica tube 10, and a carbon monoxide detection tube is connected to the silica tube 10. A gas sampler is mounted to the carbon monoxide detection tube, the gas sampler is sucked, the amount of carbon monoxide passing through the carbon monoxide detection tube is read according to a scale, and residual oil content adhering to the parts is measured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a part by machining a raw material made of a metallic material, and wiping off oil adhering to the part. TECHNICAL FIELD The present invention relates to a residual oil content measuring device and a residual oil content measuring method for measuring the residual oil content.

[0002]

2. Description of the Related Art Press working oil used in press working adheres to a part obtained by working a raw material made of a metal material by a press or the like. If a part is incorporated into a finished product with such press working oil adhered thereto, there may be problems such as malfunction of the product or accelerated deterioration of the product.

[0003] Accordingly, the pressed parts are washed with an organic solvent to remove the adhering press working oil.
After the barrel, washing and drying processes, the parts are assembled into the finished product in a clean state. However, depending on the cleaning conditions after the press working and the processing conditions of the post-process, there is a case where the press working oil remains on the part and adheres in small amounts.

[0004] In such a case, it is not possible to visually check how much residual oil is present in the component. For this reason, the residual oil content is detected using a measuring device. As an example of measuring such residual oil content, a method using carbon tetrachloride is known.

[0005] In this case, the residual oil content is measured by immersing a part which has been cleaned through the above-mentioned steps after press working in a carbon tetrachloride liquid and remaining in the part and adhering a small amount of oil. Is extracted into a carbon tetrachloride solution. Next, the oil content in the carbon tetrachloride liquid is measured by an oil concentration meter, and the residual oil content is quantitatively measured.

[0006]

As described above, in the prior art, a small amount of residual oil adhering to a clean part by removing the oil adhering at the time of press working is removed from the carbon tetrachloride liquid. It was extracted using an oil content meter, but the carbon tetrachloride solution is highly toxic and requires extra protection such as protective clothing to ensure worker safety. There was a problem. In addition, even if such protection measures are taken, there is a possibility that an unexpected situation may occur, so that there is a problem that safety is not sufficient.

[0007] The present invention has been made in view of such a problem, and it is possible to safely and accurately remove a small amount of oil remaining on a part after wiping off oil adhering during machining. It is an object of the present invention to provide a residual adhered oil content measuring device and a residual adhered oil content measuring method which can be measured well.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus for measuring the amount of residual oil contained in a device according to the first aspect of the present invention, in which a sample of a part after removal of oil adhering during machining is stored. A heat-resistant container, collecting means for collecting carbon monoxide, a heating furnace for hermetically heating the sample in the heat-resistant container at a predetermined temperature for a predetermined time, and measuring means for measuring the amount of carbon monoxide; The carbon monoxide generated therein is collected by a collecting means, the heat-resistant container is cooled to room temperature, and the carbon monoxide is returned to the heat-resistant container from the collecting means, and then the amount of carbon monoxide in the heat-resistant container is measured by the measuring means. This is achieved by employing a configuration for measuring.

According to a second aspect of the present invention, there is provided a method for measuring a residual oil content, comprising: storing a sample of a part after removing oil adhering during machining in a heat-resistant container;
Connecting the collecting means for collecting carbon monoxide to the heat-resistant container, raising the temperature of the heating furnace to 600 ° C. to 1200 ° C., carrying the heat-resistant container into the heating furnace for a predetermined time, and hermetically heating the sample. A step of collecting carbon monoxide generated therein by a collecting means, a step of air-cooling the heat-resistant container and then cooling to room temperature with water, and a step of returning the carbon monoxide collected by the collecting means to the heat-resistant container, Measuring carbon monoxide in the heat-resistant container by a measuring means.

According to the above feature of the invention according to claim 1,
Since no carbon tetrachloride is used, the residual oil content can be measured safely and accurately.

According to the above feature of the invention according to claim 2,
A sample of the part after removing the oil adhering during machining is sealed and heated at a high temperature of 600 ° C to 1200 ° C, so that a small amount of residual oil adhering to the surface of the part is burned to generate carbon monoxide. Since the amount of carbon monoxide is measured, the residual oil content can be accurately measured.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of an apparatus for measuring residual oil content according to the present invention. FIG. 6 is a front view showing a quartz tube for housing the sample 11 of the part after the oil attached during the machining is removed. The transparent quartz tube 10 includes a hollow cylindrical main body portion 10a and a hollow cylindrical branch portion 10b branched from the main body portion 10a.

A joint 12 is provided at the branch portion 10b, and the open end 13 is joined to the branch portion 10b. The part sample 11 is inserted from the end 13.
The sample 11 of the component after removing the oil adhering at the time of machining is formed by chopping a sample that is randomly removed from the machined component so that it can be inserted into the quartz tube 10.

FIG. 7 is a front view showing a teddy bag. The tedlar bag 20 includes a storage bag 20a for storing the collected carbon monoxide gas, and insertion ports 21 and 22,
The connecting hose 23 is formed. Slots 21, 2
Closing screws 21a and 22a are attached to 2 (the closing screw 21a is not shown). Storage bag 20a
Is formed of, for example, a synthetic resin material.

One end of the connecting hose 23 is connected to the insertion port 2
1 and 22, and gas is collected from the other end. In the example of FIG.
1a is removed and one end of the connecting hose 23 is inserted.

FIG. 8 is a front view showing an example of a carbon monoxide detector tube. The carbon monoxide detector tube 30 has a filter packed in a hollow cylindrical tube, and the surface has a scale (ppm).
Indicated by When a gas of carbon monoxide is passed through the carbon monoxide detector tube 30, the surface is discolored in accordance with the amount of carbon monoxide captured by the filter. Therefore, the amount (ppm) of carbon monoxide can be detected by reading the scale up to the discolored portion. As such a carbon monoxide detector tube, for example, a gas tech detector tube is used.

FIG. 9 is a front view showing the gas extractor.
The gas sampling device 40 includes a main body portion 40a, a sampling port 4
1. A handle 42 is provided. View this handle 42 with arrow A
When one stroke is pulled in the direction, gas is sucked from the sampling port 41 and taken into the main body portion 40a.

In the present invention, a sample of a part after removing the oil adhering during machining is stored in the quartz tube, sealed and heated at a high temperature, and remains on the surface of the part to adhere in a small amount. Burn the oil that is present. The basic configuration is to measure the amount of the residual oil adhering by measuring the amount of carbon monoxide generated when the container is closed and heated at a high temperature.

FIG. 1 is an explanatory view partially showing a residual adhering oil content measuring device 1 according to an embodiment of the present invention. In FIG. 1, reference numeral 2 denotes a power source, 3 denotes a control unit, 4 denotes a heating furnace formed of a refractory, 5 denotes a heater wound in a coil shape in the heating furnace, and 6 denotes a temperature sensor such as a thermocouple. , 7 are signal lines.

The control unit 3 receives signals from the power source 2 for the cables 2a, 2a
b to control the power supplied. The electric power controlled by the control unit 3 is supplied to the heater 5 through the cables 3a and 3b. When power is supplied to the heater 5 and the temperature inside the heating furnace 4 rises, the temperature sensor 6 detects the temperature inside the heating furnace 4 and inputs it to the control unit 3.

The control unit 3 controls the electric power supplied to the heater 5 so that the temperature in the heating furnace 4 becomes a predetermined temperature. As described above, the control unit 3 performs the feedback control of the electric power supplied to the heater 5 according to the signal of the temperature sensor 6.

The sample 11 of the part after removing the oil adhering at the time of machining is accommodated in the quartz tube 10, and the connecting hose 23 of the tedlar bag 20 is inserted into the end 13. As described above, the quartz tube 10 connected to the tedlar bag 20 is carried into the heating furnace 4 heated to a predetermined temperature and hermetically heated for a predetermined time.

The temperature in the heating furnace 4 and the time during which the sample of the component contained in the quartz tube 10 is closed and heated are determined so as to effectively burn a small amount of residual oil adhering to the surface of the component. It is experimentally required.

Experiments were repeated with various factors for the temperature in the heating furnace 4 and the heating time. The temperature in the heating furnace 4 was about 600 ° C. to 1200 ° C., and preferably about 1000 ° C. When about 15 minutes,
It was experimentally required that the optimum conditions be used for burning a small amount of residual oil adhering to the surface of the component. Even if the temperature in the heating furnace 4 is set to about 1200 ° C., there is no problem with respect to the heat resistance of the quartz tube 10.

Next, a specific embodiment will be described.
The temperature in the heating furnace 4 was increased to 1000 ° C.
The quartz tube 10 containing 1 is carried into the heating furnace 4 to perform hermetic heating. At this time, the temperature in the heating furnace 4 is once 830 ° C.
However, the temperature returned to 960 ° C. after several minutes.

After the temperature in the heating furnace 4 returns to 960 ° C., the sealed heating is further continued. After the quartz tube 10 containing the sample 11 is inserted into the heating furnace 4, the sealed heating is performed for a total of 15 minutes. Then, the temperature in the heating furnace 4 is increased to 1000 ° C. again. During this time, a small amount of residual oil adhering to the surface of the component is burned by closed heating to generate carbon monoxide.
The carbon monoxide is captured in the storage bag 20a of the teddy bag 20 through the connecting hose 23. The high-temperature carbon monoxide generated in the quartz tube 10 is cooled by outside air while passing through the connecting hose 23, and
Inside the storage bag 20a, the temperature has dropped to about 50 ° C. to 60 ° C.

As will be described later, the sample amount (weight) and the amount of generated carbon monoxide are substantially proportional to each other for the same part. Therefore, if the temperature in the heating furnace 4 is constant, the heating time is short when the sample amount is small, and the heating time is long when the sample amount is large.

After the completion of the closed heating process, as shown in the front view of FIG. 2, the quartz tube 10 is taken out of the heating furnace 4, and the quartz tube 10 is cooled by air cooling for about 5 minutes. Subsequently, the quartz tube 10 is cooled to room temperature by water cooling. As described above, if the air cooling is performed for about 5 minutes and then the water is cooled, it takes too much time to return to the normal temperature by the air cooling alone, and the quartz tube 10 is damaged by a rapid temperature change by the water cooling alone. This is to prevent such damage of the quartz tube 10.

The temperature of the storage tube 20a of the quartz tube 10 and the teddy bag 20 rises due to the above-described heat treatment, and the storage bag 20a expands. By lowering the temperature of the quartz tube 10 and the storage bag 20a of the tedlar bag 20 to room temperature, the pressure returns to a normal level. The measurement error is prevented from occurring by returning the quartz tube 10 to the normal temperature.

Since the storage bag 20a of the Tedlar bag 20 is inflated by the captured carbon monoxide, it is suppressed and the internal carbon monoxide is returned to the quartz tube 10 again. Next, as shown in the front view of FIG. 3, the end portion 13 is closed so that the carbon monoxide returned into the quartz tube 10 is not released, and the connecting hose of the tedlar bag is removed. At this time, the closing of the end portion 13 is performed by appropriately plugging, clipping with a clip, pressing by hand, or the like.

Next, as shown in the front view of FIG. 4, a carbon monoxide detecting tube 30 is inserted into the end 13 of the quartz tube 10, and the other end of the carbon monoxide detecting tube 30 is connected to a sampling port of the gas sampling unit 40. 4
Fit into 1. In this state, the handle 42 of the gas extractor 40 is moved by one stroke in the direction of arrow A, and the carbon monoxide returned into the quartz tube 10 is sucked.

The carbon monoxide returned into the quartz tube 10 passes through the carbon monoxide detection tube 30 and the main body 40 a of the gas sampling device 40.
Flows into. When carbon monoxide flows through the carbon monoxide detector tube 30, the surface is discolored in accordance with the amount of carbon monoxide as described above, and the scale up to the discolored portion is read to determine the amount of carbon monoxide. Measure.

By converting from the amount of carbon monoxide measured in this way, the amount of oil remaining on the part after the wiping treatment of the oil adhering during machining is obtained. be able to. In the present invention,
Since the highly toxic carbon tetrachloride is not used, the residual oil content can be safely measured.

As described with reference to FIGS. 1 to 4, in the present invention, carbon monoxide is captured in a state where the Tedlar bag 20 is connected to the quartz tube 10, and the quartz tube 10 and the Tedlar bag 20 are kept as it is. After cooling, Tedlar Bag 2
The carbon monoxide captured at 0 is returned to the quartz tube 10 again. Then, a carbon monoxide detection tube 30 is connected to the quartz tube 10, and a residual oil content of the component is measured using a gas sampling device 40.

When trapping carbon monoxide in the teddy bag 20, the quartz tube 10 and the teddy bag 20 are trapped as described above.
Storage bag 20a expands. Thereafter, the quartz tube 10 and the Tedlar bag 20 contract by cooling to room temperature, and a part of the carbon monoxide captured by the Tedlar bag 20 flows back to the quartz tube 10. For this reason, when the carbon monoxide detector tube 30 is directly connected to the Tedlar bag 20 and the residual oil content of the component is measured using the gas sampling device 40, a measurement error occurs. The residual oil content is measured in the process.

Table 1 shows data indicating the relationship between the sample amount (weight g) and the amount of carbon monoxide generated (ppm) when the residual oil content was measured as described above. 5
FIG.

[0037]

[Table 1]

As is clear from Table 1 and FIG. 1, when the parts are the same, the sample amount (weight g) of the parts and the amount of carbon monoxide generated (ppm) are substantially proportional to each other. When the sample amount (weight g) of the component is small, the characteristic is shifted from the proportional relationship due to the influence of the measurement error.

When the amount of generated carbon monoxide is precisely measured, a portable type carbon monoxide measuring device is connected to the quartz tube 10 instead of using the carbon monoxide detecting tube 30 and the gas sampling device 40. You can also. This portable type carbon monoxide measuring device measures the amount of carbon monoxide generated in units of 1 ppm.

In the above description, the raw material made of a metal material is pressed, and the residual oil adhering to the part after the oil adhering during the pressing is wiped off is measured. The present invention is not limited to press working, and it is also possible to measure a residual oil adhering to a part in a small amount with respect to a machined part using machine oil in cutting or bending. it can. Also in this case, in the same manner as described above, the residual oil is measured after removing the oil adhering during machining.

[0041]

As described above, the first aspect of the present invention does not use carbon tetrachloride, so that the residual oil content can be safely measured.

According to the second aspect of the present invention, since the sample of the part after wiping off the oil adhering at the time of machining is sealed and heated at a high temperature of 600 ° C. to 1200 ° C., A small amount of residual oil adhering to the surface of the component is burned and converted into carbon monoxide. Since the amount of carbon monoxide is measured, the residual oil adhering can be accurately measured.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of a residual oil content measuring device according to the present invention.

FIG. 2 is a front view showing a quartz tube and a teddy bag.

FIG. 3 is a front view showing a quartz tube.

FIG. 4 is a front view showing a state in which a carbon monoxide detection tube is connected to a quartz tube, and a gas sampling device is connected to the carbon monoxide detection tube.

FIG. 5 is a characteristic diagram showing a relationship between a sample amount and a carbon monoxide generation amount.

FIG. 6 is a front view showing an example of a quartz tube.

FIG. 7 is a front view showing a teddy bag.

FIG. 8 is a front view showing a carbon monoxide detector tube.

FIG. 9 is a front view showing a gas extractor.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Residual oil measurement device 2 Power supply 3 Control unit 4 Heating furnace 5 Heater 6 Temperature sensor 7 Signal line 10 Quartz tube 11 Part sample 20 Tedlar bag 30 Carbon monoxide detector tube 40 Gas sampling unit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masaru Shimono 1-5 Yokotani, Seta-Oe-cho, Otsu-shi, Shiga Prefecture Inside Ryukoku University (72) Inventor Satoshi Shimizu 1-1-2, Tsukiwa, Otsu-shi, Shiga Stock Nissin Engineering Co., Ltd. (72) Inventor Takashi Hirai 1-1-2 Tsukiwa, Otsu-shi, Shiga F-term (reference) in Nissin Engineering Co., Ltd. 2G042 BB04 CA08 CB10 DA05 DA10 GA01

Claims (2)

[Claims] 1. A heat-resistant container for storing a sample of a part after removing oil adhering during machining, a collecting means for collecting carbon monoxide, and a sample in the heat-resistant container at a predetermined temperature for a predetermined time. A heating furnace for closed heating, and a measuring means for measuring the amount of carbon monoxide, wherein carbon monoxide generated during the sealed heating of the sample is collected by a collecting means, and the heat-resistant container is cooled to room temperature and the monoxide is removed. An apparatus for measuring the amount of residual oil adhering, comprising: returning carbon to a heat-resistant container from a collecting means; 2. A step of storing a sample of the part after removing the oil adhering during machining in a heat-resistant container;
Connecting the collecting means for collecting carbon monoxide to the heat-resistant container, raising the temperature of the heating furnace to 600 ° C. to 1200 ° C., carrying the heat-resistant container into the heating furnace, and sealingly heating the sample for a predetermined time to prepare the sample. Collecting carbon monoxide generated during the closed heating of the heat-resistant container by air, cooling the heat-resistant container to air and then cooling to room temperature, and returning the carbon monoxide collected by the collector to the heat-resistant container. A method for measuring the amount of residual oil adhering, comprising: a step of measuring carbon monoxide in a heat-resistant container by a measuring means.