JP2017043793A - Removal method and removal device for residual lubrication film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent various failures generatable, e.g., in the case the object to be treated as-stuck with a lubrication film agent used upon performance of plastic working is heat-treated and is further surface-treated.SOLUTION: The object to be treated stuck with a lubrication film agent is immersed into a temperature-increased treatment liquid 13 stored into a cleaning tank 12, and is cleaned. The temperature of increasing the treatment liquid 13 is equal to the sticking temperature at which the lubrication film agent is stuck to the object to be treated or higher to 200°C.SELECTED DRAWING: Figure 1

Description

  The present invention provides a residual material that can prevent various problems that may occur when a product to which a lubricant coating agent is attached is subjected to a heat treatment and further a surface treatment by removing the lubricant coating agent. The present invention relates to a method and apparatus for removing a lubricating coating agent.

When plastic processing such as forging, rolling, and wire drawing is applied to a metal material, a phosphoric acid-based film is formed on the surface of the metal material in advance, and a lubricant film agent such as metal soap is adhered and held (" There are also known “bonding and bondage processing” or simply “bonding processing” (see, for example, Patent Documents 1 and 2).
On the other hand, it is well known that a processed product subjected to plastic working may be subjected to heat treatment such as quenching, tempering, annealing, or surface treatment such as plating.

JP 2004-52072 A JP-A-6-229409

  Since the adhesion of the lubricating coating agent is high, once the lubricating coating agent is adhered to the article to be treated, a large amount of the lubricating coating agent remains in the article to be treated even after plastic working. For example, when plastic processing is wire drawing, screw processing (such as forging and rolling) may also be performed after wire drawing. In some cases, the lubricating coating agent remained in a spiral shape.

  If the workpiece to which a large amount of the lubricant coating agent remains adhered is heat-treated as it is, the lubricant coating agent is liquefied by being heated in the furnace and adheres to the furnace wall or burner tube, resulting in a poor combustion state. Become stable. Moreover, when phosphorus contained in the lubricant coating agent is heated at a high temperature, it causes a “phosphorus phenomenon” that diffuses and penetrates into the outermost surface of the non-treated material, and the brittle fracture susceptibility becomes extremely high. For this reason, there was a case where pickling or the like was tried in another line in an attempt to remove the lubricating coating agent even a little before the heat treatment was carried out. Issues such as cost are left. For this reason, the present situation is that heat treatment is still performed with a considerable amount of the lubricant coating agent attached to the article to be treated.

  By the way, when the surface treatment is further performed after the heat treatment, the problem that the lubricant coating agent remaining on the material to be treated may interfere with the surface treatment and prevent a clean surface treatment (in the case of plating). There was a problem that some parts were not plated. Therefore, it has led to a problem that the surface treatment has to be repeated a plurality of times (twice or more) for reasons such as ensuring corrosion resistance. However, repeating the surface treatment multiple times for one article to be treated causes not only a decrease in cost performance but also a serious problem of worsening the brittleness of the article to be treated. There wasn't.

  The present invention has been made in view of the above circumstances, and various problems that may occur when a heat treatment is applied to an article to be treated to which a lubricant coating agent is adhered and a surface treatment is further performed are described. It is an object of the present invention to provide a method and an apparatus for removing a residual lubricant film that can be prevented by removing the agent.

In order to achieve the above object, the present invention has taken the following measures.
That is, the method for removing a residual lubricant film according to the present invention is characterized in that the article to be treated to which the lubricant film is adhered is immersed in a treatment liquid heated in a storage tank and washed.
The temperature for raising the temperature of the treatment liquid is preferably equal to or higher than 200 ° C. and equal to or higher than the adhesion temperature for attaching the lubricant coating agent to the article to be treated.

The temperature for raising the temperature of the treatment liquid is more preferably 60 ° C. or higher and 150 ° C. or lower.
A substance that generates an exothermic reaction when dissolved in water can be used as the treatment liquid.
The substance may be based on caustic soda.
On the other hand, the apparatus for removing a residual lubricating coating agent according to the present invention has a processing path through which a product to be processed moves in this order through a lubricating coating agent attaching step, a plastic working step, a heat treatment step, and a surface treatment step, and the plastic working A device for removing a residual lubricating coating agent installed in the lubricating coating agent removing step with respect to a production line in which a lubricating coating agent removing step is provided between the process and the heat treatment step, and stores the heated processing liquid It has a washing tank, and a transfer device which carries in and immerses the processed article which passed through the plastic working process into the washing tank.

The cleaning tank or the transfer device may be provided with a stirring mechanism that imparts a stirring operation to the article to be processed or the cleaning tank immersed in the processing solution of the cleaning tank.
The agitation mechanism may perform one-way rotation operation, half-reverse reversal operation, pendulum-like rocking operation, or vibration operation on the article to be processed, either singly or in combination. Is preferred.

  In the processed product heat treatment method and the processed product heat treatment apparatus according to the present invention, the lubricant film agent is capable of treating various problems that may occur when the object to be treated with the lubricant film agent is subjected to heat treatment and further subjected to surface treatment. This can be prevented in advance.

It is the schematic diagram which showed an example of the removal apparatus of the residual lubricating film agent which concerns on this invention. It is the schematic diagram which illustrated the implementation condition of another stirring operation in the removal apparatus of FIG. It is a schematic diagram of the production line (in the case of screw) which employ | adopted the residual lubricating film agent removal apparatus which concerns on this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show an example of a residual lubricant film removing apparatus 1 according to the present invention, and FIG. 3 schematically shows a screw manufacturing line 2 employing the removing apparatus 1.
The production line 2 shown in FIG. 3 includes a lubricating coating agent attaching step 5 for attaching a lubricating coating agent to the wire unwound from the wire roll 4, and a screw to which the lubricating coating agent is attached by forging, rolling, or cutting. Plastic processing step 6 for processing into a shape, heat treatment step 7 for heat-treating the processed article to be processed by various methods typified by quenching, tempering, annealing, etc., and plating on the article to be processed after the heat treatment, etc. And a surface treatment step 8 for performing a surface treatment.

In the present invention, the lubricating coating agent removal step 10 is provided between the plastic working step 6 and the heat treatment step 7, and the lubricating coating agent removal step 10 causes the lubrication adhered in the lubricating coating agent attachment step 5. The coating agent is removed from the article to be processed. For the lubricant removing step 10, the removing device 1 of the present invention shown in FIG. 1 is provided.
Since the production line 2 shown in FIG. 3 is for producing a screw, the plastic working step 6 includes a wire drawing step 6a and a screw working step 6b, and in particular, the wire drawing step 6a. However, the lubricant coating agent attaching step 5 is required for the purpose of improving the lubrication (friction relaxation) between the wire and the die.

  However, it is only an example that the production line 2 produces screws, and various other articles such as nuts and washers may be used, and the articles to be produced are not limited at all. Therefore, the reason why the lubricating coating agent adhering step 5 is required (the type of processing performed in the plastic processing step 6) is not particularly limited to forging (forging, etc.), rolling, cutting, rolling, and pressing. Absent.

  As shown in FIG. 1, the removal apparatus 1 according to the present invention is configured mainly with a cleaning tank 12. The cleaning tank 12 stores a processing liquid 13 that has been heated to a predetermined temperature. Then, the article to be processed that has undergone the plastic processing step 6 is carried into the washing tank 12 by the transfer device 15 in a state of being accommodated in the basket 14 or the like, and is carried out toward the heat treatment step 7. ing.

In the transfer device 15 shown in the figure, the handling mechanism 17 moves along the upper track 16 to raise and lower the basket 14 at a position above the cleaning tank 12, so that the article to be processed in the basket 14 is moved into the cleaning tank 12 (processing). The liquid is provided with a structure for taking it into and out of the liquid 13. The handling mechanism 17 is further provided with a stirring mechanism (not shown). The basket 14 is immersed in the cleaning tank 12 (in the treatment liquid 13) and then rotated in one direction with respect to the basket 14. Any one of operation, half-reverse reversal operation, pendulum-like swing operation, and vibration operation is selected and applied to create a situation in which the workpiece in the basket 14 is agitated. It has become.

  For example, in FIG. 1, the handling mechanism 17 (basket 14) can be selected by selecting one or a combination of one-way rotation operation, half-rotation reversal operation, pendulum-like swing operation, and vibration operation. In FIG. 2, the handling mechanism 17 (basket 14) is tilted, and one of the unidirectional rotation operation, the reversal and reversal operation of the half rotation, the pendulum-like swing operation, and the vibration operation are united. Alternatively, the image is selected and implemented in combination. Furthermore, it is also possible to perform a one-way rotation operation, a half-reverse reversal operation, and a vibration operation in a single or sequential manner while swinging the handling mechanism 17 (basket 14) like a pendulum.

  In addition, such a transfer apparatus 15 can also be comprised as what the handling mechanism 17 was provided with respect to the traveling vehicle which moves along the track | orbit provided in the base surface 18 side which installed the washing tank 12. FIG. . In addition, various systems such as a configuration in which the basket 14 is directly conveyed by a conveying device such as a belt conveyor or a roller conveyor can be employed.

In some cases, it is possible to adopt a method of transferring the basket 14 by a forklift or by human power. The point is that any system can be used as long as it can take in and out the processed product through the plastic working process 6 with respect to the cleaning tank 12, and the basket 14 is not used depending on the processed product (for example, when it is large). be able to.
The temperature for raising the temperature of the treatment liquid 13 in the cleaning tank 12 is an adhesion temperature when the lubricant film agent is adhered to the object to be treated in the lubricant film adhesion step 5 (in many cases, about 60 to 80 ° C.). As a guideline, it should be equal to or higher than the adhesion temperature. It has been confirmed by experiments by the present inventors that the removal (peeling) effect of the lubricant film agent is increased at this temperature, and that the removal effect tends to increase as the temperature is increased.

When the temperature for raising the temperature of the treatment liquid 13 in the cleaning tank 12 is less than 60 ° C., the removal (peeling) effect of the lubricant coating agent is insufficient or hardly confirmed, and the removal effect may be recognized. Even if it is rare, there is a problem that it becomes unstable, including when the effect is insufficient or when there is no effect.
On the other hand, since it is extremely uneconomical for cost effectiveness to raise the temperature of the treatment liquid 13 in the cleaning tank 12 so that the temperature rises above 200 ° C., it is preferable to keep it at 200 ° C. or less. Become. More preferably, it is good to set it as 150 degrees C or less. In the range of 150 to 200 ° C., although a slight effect was observed from the viewpoint of time shortening as the temperature was increased, a result that the difference in the removal effect of the lubricant coating agent was not so recognized was obtained.

  As a substance used as the treatment liquid 13, for example, caustic soda as a main material and an additive or the like may be used. Caustic soda generates an exothermic reaction when dissolved in water, so the time required to achieve a predetermined high temperature can be reduced by omitting electric heating and combustion heating to raise the temperature, or by setting the heating temperature for a while. Effects and cost reduction effects can be obtained. For example, by heating the treatment liquid 13 to about 120 ° C., as a result, it is possible to raise the temperature of about 140 ° C. to 160 ° C.

In connection with raising the temperature of the processing liquid 13, it is preferable that the basket 14 is made of a metal such as stainless steel and has heat resistance and chemical resistance.
The time for which the article to be treated is immersed in the treatment liquid 13 depends on various conditions such as the material type, concentration and temperature of the treatment liquid 13, the size, amount and material of the article to be treated, the type of lubricant coating, and the presence or absence of stirring. Although it fluctuates, if the treatment liquid 13 is about 140 ° C., the removal of the lubricating coating agent is substantially completed in an immersion time of 5 minutes to 30 minutes. When the temperature of the treatment liquid 13 exceeds 140 ° C., the immersion time can be further shortened (for example, about 3 minutes may be sufficient).

  In the case of using caustic soda as the main material for the concentration of the treatment liquid 13, the mixing ratio with water is preferably 5 to 40 g / l. When it is less than 5 g / l, it becomes the same level as the case where water (without caustic soda) is used as the treatment liquid 13, and a long treatment time is required. On the other hand, since caustic soda is substantially saturated at 40 g / l, it is meaningless to mix caustic soda over 40 g / l.

  As described above, in the present invention, the article to be treated to which the lubricant coating agent is attached is washed by immersing it in the treatment liquid 13 stored in the washing tank 12 and heated. Can be almost completely removed. Therefore, in the heat treatment step 7, the lubricating coating agent is naturally not burned on the processed product by heating the processed product at 800 ° C. to 900 ° C. Therefore, the lubricating coating agent remaining on the processed product is eliminated. Various problems caused by the above can be prevented in advance.

In other words, when a plastically processed product using a lubricating coating agent is heat treated and further subjected to a surface treatment such as plating, the surface treatment is completed in one time, and a clean finish (surface coating) and high corrosion resistance are achieved. There is an advantage that it can be obtained. Therefore, in the surface treatment process, the cost performance is excellent, and there is no possibility of causing deterioration of brittleness in the article to be treated.
By the way, this invention is not limited to the said embodiment, It can change suitably according to embodiment.

For example, the case where the agitation mechanism is provided for the transfer device 15 has been described, but the agitation mechanism may be provided so as to impart an agitation operation such as rotation, oscillation, vibration, etc. to the cleaning tank 12. Moreover, the removal effect of the lubricating coating agent can be obtained even if the article to be treated is left still in the cleaning tank 12 without providing a stirring mechanism.
The treatment liquid 13 is not limited to the use of caustic soda, and may be hot water or other oil types.

  In the above embodiment, the plastic working step 6 is exemplified as having the wire drawing step 6a and the screwing step 6b. In this case, it is mainly the wire drawing step 6a that the lubricant coating is required. In the threading step 6b, a lubricating coating agent is not necessarily required. Therefore, the plastic processing step 6 may be provided in the wire drawing step 6a, and the lubricant film removing step 10 may be provided between the wire drawing step 6a and the screw processing step 6b.

DESCRIPTION OF SYMBOLS 1 Removal apparatus 2 Production line 4 Wire roll 5 Lubricating film agent adhesion process 6 Plastic processing process 6a Wire drawing process 6b Screw processing process 7 Heat treatment process 8 Surface treatment process 10 Lubricating film agent removal process 12 Cleaning tank 13 Treatment liquid 14 Basket 15 Transfer Mounting device 16 Upper track 17 Handling mechanism 18 Base surface

Claims (8)

  A method for removing a residual lubricating coating agent, wherein the article to be processed to which the lubricating coating agent is adhered is cleaned by immersing it in a processing solution heated in a storage tank.   The method for removing a residual lubricating coating agent according to claim 1, wherein the temperature for raising the temperature of the treatment liquid is set to be equal to or higher than 200 ° C with respect to an adhesion temperature for attaching the lubricating coating agent to an article to be processed.   The method for removing a residual lubricating coating agent according to claim 2, wherein the temperature for raising the temperature of the treatment liquid is 60 ° C or higher and 150 ° C or lower.   The method for removing a residual lubricant film according to any one of claims 1 to 3, wherein a substance that generates an exothermic reaction when dissolved in water is used as the treatment liquid.   5. The method for removing a residual lubricating coating agent according to claim 4, wherein the substance is mainly made of caustic soda. It has a processing path through which the article to be processed moves in the order of the lubricating film agent attaching process, plastic working process, heat treatment process, and surface treatment process, and a lubricating film agent removing process is provided between the plastic working process and the heat treatment process. A device for removing the residual lubricant film installed in the lubricant film removal step with respect to the production line,
A cleaning tank for storing the heated processing liquid;
A transfer device for carrying the article to be processed that has undergone the plastic working step into the washing tank and immersing it;
An apparatus for removing a residual lubricating coating agent, comprising:   The cleaning tank or the transfer device is provided with a stirring mechanism that imparts a stirring operation to the article to be processed or the cleaning tank immersed in the processing liquid of the cleaning tank. The apparatus for removing a residual lubricating coating agent according to claim 6.   The agitation mechanism performs one-way rotation operation, half-reverse reversal operation, pendulum-like rocking operation, or vibration operation on the article to be processed in a single or combined manner. 8. The apparatus for removing a residual lubricating coating agent according to claim 7,

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