KR20070012249A - Fusion/coagulation fixing agent for machining and machining method - Google Patents

Abstract

A fusing/solidifying fixer of a machine work and a method thereof are provided to improve adhesive strength about workpieces and to simplify a cleaning work after processing the machine by using shellac resin. A fusing/solidifying fixer(13) of a machine work comprises a mixture of powder rosin 10~95 weight percent and unfired powder shellac 90~5 weight percent. A mixed ratio of the powder rosin is 35~80 weight percent. The mixture is pressed and hardened into a predetermined shape. A method for processing with a machine includes steps for heating and melting the fusing/solidifying fixer and spraying on the surface of a workpiece fixing table(21); pressing a workpiece on the sprayed fixer, lowering temperature of the fixer by pressing the workpiece on the fixing table, and fixing the workpiece on the fixing table by hardening the fixer; and processing the workpiece, cleaning the workpiece and the fixing table after finishing processing by using a glycol-ether solution, and dissolving the fixer with the glycol-ether solution.

Description

FUSION / COAGULATION FIXING AGENT FOR MACHINING AND MACHINING METHOD}

BRIEF DESCRIPTION OF THE DRAWINGS The table which shows the relationship with the amount of rosin added, adhesive strength, and washing time in this invention.

2 is a graph showing the relationship between the amount of rosin added, adhesive strength and cleaning time in the present invention.

3 is an explanatory diagram of a washing method in the present invention.

4 (a) and 4 (b) are explanatory diagrams of the adhesive strength measuring method in the present invention.

5 is an explanatory diagram of a Mohs hardness measurement method according to the present invention.

It is a front view of the workpiece | work fixed table to which the workpiece | work was fixed of 1st Embodiment of this invention.

(Explanation of symbols of main part of drawing)

10: container 11: heater

12: Workpiece 13: Fixative

14: hanger 20: test piece

21: fixed table

The present invention relates to workpieces made of materials such as nonferrous metals, magnets, ceramics, glass, or plastics, in particular thin plates or fragile workpieces, which cannot be used in a magnetic workpiece fixing method, Or it relates to a machining melt / coagulation fixing agent and a machining method that is effectively used in the case of easily fixing a spherical workpiece having an unstable center of gravity.

Conventionally, melting / coagulation fixatives for various machining in this manner have been proposed. Japanese Laid-Open Patent Publication No. 2003-300127 discloses the use of a resin that is a liquid when heated to a predetermined temperature and solid at room temperature as a melting / coagulation fixing agent. As a detailed example of such a resin, use of natural resins such as rosin, shellac, dammar or balsam, and thermoplastic synthetic resins has been described.

However, such shellac resin is a natural resin purified from dendritic secretions produced by an insect called Lacifer lacca KERR, and the melt / coagulant fixing agent for machining comprising the shellac resin is Practically used.

An example of such a shellac resin is "Adfix" as described in Nikka Seiko's product catalog Vol. 7, page 2, and the melt / coagulation fixing agent for machining comprising shellac resin of the prior art is prepared by mixing The mixture was molded into various shapes by melting / solidifying in a container.

However, since the shellac resin is a thermosetting resin, a phenomenon in which the thermosetting reaction (crosslinking reaction) of the shellac resin proceeds to a certain extent occurs in the step in which the fixative component is melted / solidified in the container and molded. Resin deteriorates.

Therefore, in order to use the fixing agent shape | molded to a predetermined shape as an actual workpiece fixing agent, the said fixing agent is heat-fused again on the surface of a workpiece fixing table, and is used. However, since the said shellac resin is already deteriorated at the time of use, it turns out that the adhesive strength of the said workpiece falls.

Moreover, as a result of several heating and melting, the thermosetting reaction of the said shellac resin advances, and the said fixation agent isolate | separates after completion of a machining, and also makes it difficult to remove a workpiece. Indeed, when the thermosetting of shellac resin proceeds extremely, it is not possible to separate the fixative from the workpiece even by performing a long time high temperature alkaline cleaning, for example, by using a spatula or a similar tool. Use a mechanical scraping method. However, this type of mechanical removal method is not applicable to small or fragile workpieces.

In addition, the alkali cleaning method is limited to processing materials such as magnets or carbon that are not corroded by an alkaline solution, and therefore cannot be applied to general metals such as aluminum.

The object of this invention is to consider the said problem, and to improve the adhesive strength of a workpiece | work, and to simplify the washing | cleaning process after machining of the melting / coagulation fixative for machining using shellac resin.

This invention is comprised as follows.

(1) A melting / solidifying fixative for machining comprising a mixture of 10 to 95% by weight of powdered rosin and 90 to 5% by weight of unheated powdered shellac resin.

(2) The melting / coagulation fixing agent for machining according to (1), wherein the mixing ratio of the powdered rosin is 35 to 80 wt%.

(3) The melting / solidification fixing agent for machining according to (1) or (2), wherein the shellac resin and powdery rosin are mixed and pressed into a predetermined solid shape after mixing.

(4) heating and melting the melt / coagulation fixative for machining according to any one of (1) to (3) and applying it to the surface of the work holding table;

The workpiece is fixed to the workpiece by pressing the workpiece onto the fixture applied to the surface of the workpiece holding table, lowering the temperature of the fixture to its solidification temperature while pressing the workpiece onto the workpiece holding table, and solidifying the workpiece. Fixing to the surface of the table,

Machining the workpiece, washing the workpiece and the workpiece holding table using a glycol-ether aqueous solution after completion of the machining, and further dissolving the fixing agent in the aqueous solution of glycol-ether. Machining method comprising a.

According to an experimental study carried out by the inventor of the present invention, the non-heated powder mixture is compared with the non-heated powder mixture and the melted product in relation to the adhesive strength of the melting / solidifying fixing agent for machining composed of a mixture of shellac resin and rosin. The adhesive strength of was found to be much higher than that of the molten product.

Fig. 1 is a table showing the relationship between the amount of rosin added, the adhesive strength and the cleaning time when a similar powdery rosin is added to powdery shellac, and Fig. 2 shows a graph of the relationship.

The powdered shellac has a particle diameter of 180 microns or less, brown, a softening point of about 80 ° C., a solid specific gravity of 1.02 to 1.12 at 20 ° C., a volatile component of 2.0%, and warm alcohol. The content of insoluble matter is 0.21% and the content of wax is 3.31%.

On the other hand, the powdered rosin has a particle diameter of 180 microns or less, an amber color, a softening point of 81 ° C, and a solid specific gravity of 1.05 at 20 ° C.

The weight of the two kinds of powders was set in the predetermined ratios shown in Figs. 1 and 2, and the mixture was stirred in a container so as to mix well at a uniform ratio, thereby obtaining a powdery fixative. The powder mixture of FIGS. 1 and 2 means the mixture (powder fixative) that has not been heated or cured.

In contrast, the molten product shown in FIGS. 1 and 2 means a fixative obtained by heat melting this powder mixture at 140 ° C. for 1 minute and then cooling to solidification to room temperature to form a solid fixative. Therefore, this fixing agent is a one-time heating and curing treatment in the same manner as the fixing agent using shellac resin in the prior art.

Powder mixture cleaning time means the cleaning time when 0.15-0.20 grams of powder mixture fixer is arrange | positioned on the test piece consisting of Al100 aluminum plate of 40 mm in length x 40 mm in width x 2 mm in thickness, The test piece was heated at 140 ° C. for 1 minute to melt the fixer, the fixer was applied onto the surface of the test piece, cooled to room temperature to coagulate the fixer, and further immersed in an aqueous glycol-ether solution at 80 ° C. ( Viii) to clean. Here, the washing time is defined as the amount of time from the time when the test piece is immersed in the glycol-ether-based aqueous solution to the time when all the fixing agents are separated from the surface of the test piece.

Since the powdery shellac resin in the powder mixture is not heated and does not undergo a thermosetting reaction, deterioration due to the thermosetting reaction does not occur. Therefore, the adhesive strength resulting from the use of the non-heated powder mixture exceeds the adhesive strength of the melted product over almost the entire range of the addition amount of the rosin as shown in FIGS. 1 and 2.

Here, when the addition amount of rosin exceeds 95 weight%, since adhesive strength falls rapidly, the upper limit of the addition amount of rosin in this invention is 95 weight%. On the other hand, when the addition amount of rosin decreases to 10% by weight or less, the washing time increases rapidly, so the lower limit of the addition amount of rosin is 10% by weight.

As shown in FIG. 1 and FIG. 2, when the addition amount of rosin is set in the range of 35 to 80 weight%, the adhesive strength can be further increased, and the washing time after completion of machining can be further shortened. In addition, the range A of the rosin addition amount shown in FIG. 2 corresponds to Claim 1, and the range B corresponds to Claim 2.

In the prior art, a fixative composed of a mixture of shellac resin and rosin is typically washed from the workpiece with a hot organic solvent or a hot, high concentration alkali solution. Thus, there were disadvantages with respect to the generation of dirty odors and environmental problems.

In the machining method according to the present invention, the workpiece is washed using a glycol-ether-based cleaner for a fixative composed of a mixture of shellac resin and rosin. Here, the glycol-ether type cleaning agent is used especially in the form of the aqueous solution diluted with water. According to the studies conducted by the inventors of the present invention, the glycol-ether-based cleaning agent can guarantee the cleaning degree comparable to the organic solvent, even though it is an aqueous solution.

Here, the glycol-ether type | system | group cleaning agent is represented by general formula RO-An-R, R represents a hydrogen element, a methyl group, or an ethyl group, for example, and A represents the ethoxy group or propoxy, for example. (propoxy) group, n shows the integer of 1-2.

Next, with reference to FIG. 3, the detailed example of the washing | cleaning step using a glycol-ether type cleaning agent is demonstrated. In FIG. 3, (a) shows step 1 of generating an aqueous solution of 3-fold diluted glycol-ether cleaner. More specifically, the detergent which contains the glycol-ether type detergent and water in the ratio of 1: 2 is diluted in the container 10 at room temperature. In step 1, since the glycol-ether-based cleaning agent is room temperature, the entire aqueous solution is hydrophilic.

Next, in FIG. 3, (b) shows step 2 in which heating means such as an immersion heater 11 is inserted into the container 10 to heat the aqueous solution of (a) to a high temperature of 60 ° C or higher. In step 2, the aqueous solution is separated into a translucent hydrophilic layer and a transparent lipophilic layer as a result of heating to 60 ° C. or higher. Since the hydrophilic layer has a high specific gravity and the lipophilic layer has a low specific gravity, a hydrophilic layer is formed at the bottom of the container 10 and a lipophilic layer is formed at the top of the container.

Here, hydrophilic means the property of dissolving in water, and lipophilic means the property of dissolving in oil. In addition, the heating temperature of 60 ° C. in step 2 is the lowest temperature required to separate the aqueous solution into a hydrophilic layer and a lipophilic layer.

Then, in FIG. 3, (c) shows step 3 for cleaning the workpiece 12. Here, the workpiece 12 is the same as the test piece described previously, and the fixing agent 13 is solidified on the surface of the aluminum plate. The whole workpiece 12 is appropriately contacted with the lipophilic layer by hanging in a hanger 14 and moving up and down in the glycol-ether based aqueous solution.

Thus, the cleaning ability of the lipophilic layer can be ensured for the entire work piece 12. The fixative 13 is separated from the workpiece 12 and dissolved in the lipophilic layer. Thus, the fixing agent 13 can be removed from the surface of the workpiece 12.

3, (d) shows step 4A for lifting the workpiece 12 out of the container 10. In step 4A, the workpiece 12 is lifted from the vessel 10 while maintaining the temperature of the aqueous solution at 60 ° C. Subsequently, air is blown onto the surface of the workpiece 12 to remove the aqueous solution adhering to the surface of the workpiece 12.

Next, in FIG. 3, (e) represents the rinsing step 5. In step 5, a separate container 15 filled with hot water heated to 60 ° C or more is prepared, and the workpiece 12 is placed in the container 15 by moving the workpiece 12 up and down. We perform water washing work of surface. Subsequently, the workpiece 12 is lifted out of the container 15 to blow air to the surface of the workpiece 12 to remove moisture adhering to the surface of the workpiece 12 again. This completes the cleaning step.

Furthermore, after performing step 4A (lifting the workpiece 12 from the container 10) of FIG. 3 (d), step 4B (filtration and removal of the fixative) shown in FIG. 3 (f) is performed. Run In step 4B, the temperature of the glycol-ether based aqueous solution in the vessel 10 is lowered to room temperature. Thus, the transparent lipophilic layer of the aqueous solution disappears and the entire aqueous solution returns to the hydrophilic state. At the same time, the fixative previously dissolved in the lipophilic layer of the aqueous solution is separated from the aqueous solution and suspended in a fine solid form on the surface of the aqueous solution.

Therefore, by fixing the surface layer of the aqueous solution with an appropriate filtration member such as filter paper, such a solid fixative can be separated and removed. As a result, the glycol-ether type aqueous solution in the said container 10 can be used repeatedly for washing | cleaning the workpiece | work 12. As shown in FIG.

In step 2, if the thickness of the lipophilic layer becomes excessively thin, an undiluted glycol-ether based cleaner must be added to the vessel 10. In addition, filter paper or the like used for filtering the solid fixative may be disposed together with a rag or the like.

According to a study conducted by the inventors of the present invention, it was confirmed that the glycol-ether-based cleaning agent had no corrosive action to metals such as aluminum, and exhibited the same cleaning ability as that of organic solvents such as trichloroethane and acetone. It was.

Moreover, the glycol-ether type | system | group cleaning agent is excellent compared with an organic solvent since there is no danger of a fire or ignition in a machining chamber, and there is little smell.

Next, the measuring method of the adhesive strength of a fixing agent is demonstrated in more detail with reference to FIG.4 (a) and FIG.4 (b). Fig. 4A shows the test piece 20 having a T shape corresponding to the target workpiece to be fixed. This T-shaped test piece 20 was made of SUS304, and its surface roughness was 4.0 Rz. In addition, the dimension of the T-shaped test piece 20 is as showing to FIG. 4 (a).

4 (b) shows an outline of a tensile test method for measuring the contact strength of the fixing agent 13 which fixes the test piece 20 to the fixing table 21. In this test method, SUS400 was used as the material of the fixed table 21, because this material is adsorbed on the magnet to facilitate flat polishing and also does not rust. The illuminance of the fixed table 21 is 3.0 Rz.

The T-shaped test piece 20 is fixed to the surface of the fixed table 21 with a fixing agent 13, a push-pull gauge 22 is connected to the T-shaped test piece 20, and a push-pull gauge Tensile force F is manually applied to (22), and the maximum tensile force F when the T-shaped test piece 20 is separated from the fixed table 21 is measured.

The adhesive strength was measured 6 times with respect to the same fixative, and the average value was determined to measure the adhesive strength of the high tablet 13. These values are the adhesive strengths shown in FIGS. 1 and 2. More specifically, the product melt | dissolved with the powder mixture of the various compound ratios shown in FIG. 1 and FIG. 2 as the fixing agent 13 was used, and the adhesive strength was measured using the said method. The data from these measurements are summarized in FIGS. 1 and 2. In addition, the surface temperature of the fixing agent 13 at the time of adhesive strength measurement was 20.0-21.0 degreeC.

Next, the hardness measurement method of the fixing agent 13 is demonstrated with reference to FIG. Reference numeral 30 denotes an aluminum plate corresponding to the workpiece, and the fixing agent 13 is fixed to the surface thereof. More specifically, the aluminum plate on which the fixing agent 13 is disposed is heated at a surface temperature of 140 ° C. for 1 minute to melt the fixing agent 13, thereby fixing the fixing agent 13 on the surface of the aluminum plate 30. Apply. Subsequently, the aluminum plate 30 is cooled to lower the surface temperature of the aluminum plate 30 to 20 ° C. to solidify the fixing agent 13 to fix the fixing agent to the surface of the aluminum plate 30.

In this state, the hardest pencil or pencil-like pencil that does not damage the fixer 13 by holding a pencil or pencil-shaped Mohs durometer 31 by hand and scraping off the surface of the fixer 13. The hardness of Mohs' hardness tester was made into the hardness of the fixing agent 13 of a measurement object.

In this example, the surface hardness of the fixing agent 13 was measured by combining the pencils 6B to 9H with a pencil type Mohs hardness meter having a Mohs hardness of 4 to 10 as the Mohs hardness meter 31.

As can be appreciated from FIGS. 1 and 2, the adhesive strength of the molten article is inferior to the powder mixture. This is because, as described above, the shellac resin is a thermosetting natural resin, and as a result of heating, the thermosetting reaction proceeds to a predetermined degree and causes deterioration. This tendency becomes more pronounced as the heating temperature is higher and as the heating time is longer.

Both the adhesive strength of the non-heated powder mixture according to the present invention and the adhesive strength of the molten product used as the comparative example are substantially the same as the rosin addition amount up to 30 wt%, and the rosin addition amount when the rosin addition amount is in the range of 35 to 80 wt%. Adhesive strength improved more than this range to 30 weight%.

When the addition amount of rosin increases to 80% by weight or more, the adhesive strength tends to decrease rapidly. On the other hand, the more the amount of rosin addition is, the shorter it becomes, and when the amount of rosin addition is 10% or more, the effect of shortening the washing time is particularly large.

For reference, the cleaning time of the conventional product using the glycol-ether type aqueous solution is demonstrated. The cleaning time of Adfix A manufactured by Nikka Seiko was 2 minutes and 50 seconds, and it was determined that the fixative of the present invention could considerably improve the cleaning performance compared to this prior art product.

In comprehensively judging according to the above data on the adhesive strength and the cleaning time, the fixing agent of the present invention can be used as the fixing agent if the range of the rosin addition amount is 10 to 95% by weight, and the rosin addition amount is 35 to 80% by weight. If it is in the range, both the improvement of adhesive strength and the shortening of washing time can be implement | achieved satisfactorily.

The powder mixture of the present invention can naturally be used in the form of a powder, but can also be used in the form of a solid in order to improve workability at the time of application. At this time, it is important to mold the uniformly mixed fixative powder directly into a solid at room temperature instead of filling the product container after heating and melting the material as in the prior art. Therefore, a solid fixative can be acquired, maintaining a "non-heated state."

More specifically, by fixing the uniformly mixed fixing agent powder directly, the fixing agent powder can be formed into a predetermined solid shape (circular shape) at room temperature. Since rosin is viscous (adhesive) even at room temperature, the fixing agent powder can be formed into a solid form at low pressure by increasing the addition amount of rosin.

When inorganic powders such as alumina or carbon are added to the fixing agent of the present invention composed of shellac resin and rosin, properties such as adhesive strength, hardness, viscosity, conductivity and brittleness can be improved. . In particular, when carbon is added, the conductivity of the fixing agent is improved, and therefore, it can be used for electric discharge machining and the like.

In addition, when the adhesive strength of the fixing agent is strong, it is possible to efficiently carry out magnet cutting and planar grinding of a stainless steel sheet having a large cutting load. In addition, the fixing agent having a large hardness can be embedded in a part of the workpiece to suppress the formation of burrs during grinding or cutting.

(First embodiment)

A fixing agent is obtained by mixing 50% by weight of the unheated powdery shellac resin and 50% by weight of the powdered rosin. Here, powdery shellac resin and powdery rosin are well stirred in a container and mixed uniformly.

The powdery shellac resin is a non-heating natural thermosetting material purified by a chemical method that does not heat, using a solid dendritic secretion of an insect called Lacifer lacca KERR as its raw material. Resin. The particle diameter, softening point, specific gravity, etc. of the said powdery shellac resin are as above-mentioned.

The powdery rosin is a thermoplastic resin obtained by refining rosin. The particle diameter, softening point, specific gravity, etc. of the said powdery rosin are as above-mentioned.

The physical properties of the powdery fixative obtained by mixing 50% by weight of the powdery shellac resin and 50% by weight of the rosin of the powder are as follows: Mohs hardness: 2.3, adhesive strength: 21.9 kg / cm 2, softening point: 80 ° C. Solid specific gravity at 20 ° C .: 1.03, liquid specific gravity at 150 ° C .: 1.00.

The powdery fixative is pressed into a solid shape by pressing in an unheated state. Accordingly, the fixative can be easily handled. This solid shape may be cylindrical as an example, and the magnitude | size may be about 20 mm in diameter and about 100 mm in length.

Next, an example of the machining method using this powdery fixative is demonstrated. FIG. 6: shows the state of the workpiece | work 12 fixed with the fixing agent 13 on the surface of the workpiece | work fixed table 21 in this embodiment. In this embodiment, the workpiece 12 is a metal plate made of a nonmagnetic material such as a SUS304 metal plate, and the plate thickness thereof is, for example, about 1 mm. This flat plate-like workpiece 12 is polished.

In the present embodiment, the workpiece holding table 12 is formed in a spherical or circular shape with an iron-based material (for example, S50C or SUS440) that is a magnetic material.

In the machining method of the present embodiment, first, the workpiece fixing table 12 is disposed on a heating means not shown in the figure, such as a heat transfer plate, and the cylindrical fixing agent 13 is placed on the workpiece fixing table 12. ), And the workpiece fixing table 12 is heated to the melting temperature of the fixing agent 13 by the heat transfer plate. Here, the melting temperature of the fixing agent 13 is 20 to 40 ° C. higher than the softening point of the fixing agent 13.

In the present embodiment, it has been found that the surface temperature of the workpiece holding table 21 when the fixing agent 13 melts on the surface of the workpiece holding table 21 and diffuses in a liquid state is 110 ° C. Therefore, in this embodiment, the temperature 140 degreeC which is predetermined amount (30 degreeC) higher than this 110 degreeC is set as heating temperature of the fixing agent 13, and the surface temperature of the workpiece | work fixed table 21 reaches 140 degreeC. The workpiece holding table 21 is heated until it is.

Accordingly, the fixing agent 13 is melted on the surface of the workpiece holding table 21, diffused into a liquid state, and applied onto the surface of the fixing table 21.

Subsequently, the workpiece 12 is placed on the fixing agent 13 applied on the surface of the workpiece holding table 21, and the workpiece 12 is placed on the fixing agent 13 by an appropriate pressing means (for example, a pressing member). Pressure In this manner, the workpiece holding table 21 is removed from the heat transfer plate in the state where the workpiece 12 is pressed on the fixing agent 13, and the workpiece 12 and the workpiece holding table 21 are cooled to room temperature in a room temperature atmosphere. .

As a result, the temperature of the fixing agent 13 drops below the solidification temperature and the fixing agent 13 solidifies, so that the workpiece 12 is fixed to the surface of the workpiece fixing table 21. Subsequently, the pressing means are removed as they are no longer needed.

Subsequently, the workpiece fixing table 21 is fixed with an electromagnetic force on the electromagnetic chuck table of the polishing machine not shown in the drawing. Subsequently, surface polishing is performed on the workpiece 12.

After completion of polishing, the workpiece holding table 21 is removed from the polishing machine, and the workpiece holding table 21 and the workpiece 12 are cleaned using a glycol-ether based aqueous solution. This washing step uses the same method as the method shown in FIG. 3, and a detailed description thereof will be omitted.

In addition, although FIG. 3 shows only the workpiece | work 12 and the fixing agent 13, in reality, the workpiece 12 is the hanger 14 in the state fixed to the workpiece | work fixing table 21 by the fixing agent 13. In FIG. The workpiece 12 and the workpiece holding table 21 are sandwiched and held together.

In this washing step, the fixing agent 13 can be dissolved in the lipophilic layer of the glycol-ether-based aqueous solution. Thereby, the fixed state of the workpiece | work 12 and the workpiece | work fixing table 21 can be released. Therefore, after completion of the cleaning step, the workpiece 12 and the workpiece holding table 21 may be detached from the hanger 14 to separate the workpiece 12 from the workpiece holding table 21.

(2nd Embodiment)

In the second embodiment, 20% by weight of the unheated powdery shellac resin and 80% by weight of the rosin in powder form a mixture to prepare a fixative. The mixing ratio of this shellac resin and rosin is different from the mixing ratio in the first embodiment. The physical properties of the fixing agent according to the second embodiment are as follows: adhesive strength: 20.1 kg / cm 2 and softening point: 80 ° C.

Since the machining method in this 2nd Embodiment is the same as that of 1st Embodiment, the detailed description is abbreviate | omitted. In the second embodiment, the powdery fixing agent is pressed to form a cylindrical solid shape having a diameter of 20 mm and a length of 100 mm. According to the second embodiment, since the mixing ratio of the rosin with better adhesion is higher than in the first embodiment, the powdery fixative can be easily pressed at a lower pressure than in the first embodiment.

Moreover, it turned out that the surface temperature of the workpiece | work fixed table 21 at the time of a diffuser instantaneous diffusion in a liquid state is 110 degreeC which serves as an index of the application temperature of a fixed agent. This temperature is the same as the temperature in 1st Embodiment.

According to the second embodiment, since the mixing ratio of the rosin is higher than that of the first embodiment, the time for washing the fixative using the aqueous solution of glyc-ether is shorter.

(Third Embodiment)

In 3rd Embodiment, 40 weight% of unheated powdery shellac resin, 50 weight% of powdery rosin, and 10 weight% of powdery alumina whose average particle diameter are 1 micron are mixed, and a fixing agent is obtained.

The physical properties of the fixing agent according to the third embodiment are as follows: Mohs' Hardness: 2.5, Adhesive Strength: 16.2 kg / cm 2, Softening Point: 80 ° C, Solid Specific Gravity at 20 ° C: 1.13.

Since the machining method in this 3rd Embodiment is the same as that of 1st Embodiment, the detailed description is abbreviate | omitted. Also in the third embodiment, the powdery fixing agent is pressed to form a cylindrical solid having a diameter of 20 mm and a length of 100 mm.

Moreover, it turned out that the surface temperature of the workpiece | work fixed table 21 at the time of a diffuser instantaneous diffusion in a liquid state is 130 degreeC which serves as an index of the application temperature of a fixed agent. Therefore, the application temperature (heating melting temperature) of the fixing agent in the third embodiment is higher than the temperature in the first embodiment and the second embodiment.

Since the fixing agent according to the third embodiment has a higher viscosity due to the addition of alumina than the first embodiment, the fixing agent has a property that is hard to peel off. In addition, this fixing agent has a characteristic of not being attached to the grindstone when the workpiece 12 is cut using the grindstone.

(4th Embodiment)

In 4th Embodiment, 30 weight% of unheated powdery shellac resin, 50 weight% of powdery rosin, and 20 weight% of powdery carbon black are mixed, and a fixing agent is obtained.

The physical properties of the fixing agent according to the fourth embodiment are as follows: Mohs' Hardness: 6.0, Adhesive Strength: 15.2 kg / cm 2, Softening Point: 80 ° C, Solid Specific Gravity at 20 ° C: 1.10, Volume Resistivity 190 Pa.cm to be.

The powder mixture was pressed to form a cylindrical solid shape having a diameter of 20 mm and a length of 100 mm, and the surface temperature of the workpiece holding table 21 when the fixing agent momentarily diffused into the liquid state was fixed. It turned out to be 130 degreeC which serves as an index of agent application temperature.

Since the fixing agent according to the fourth embodiment is water-insoluble and conductive, wire fixing can be performed on the workpiece 12. In addition, the fixing agent according to the fourth embodiment has a higher viscosity and greater hardness than the fixing agent of the first embodiment by addition of powdery carbon black.

(Other Embodiments)

In addition, although the example which grinds the workpiece | work 12 comprised from a nonmagnetic material was demonstrated in 1st Embodiment, this invention is not limited to this, The specific processing applied to the material of the workpiece | work 12, or the workpiece | work 12 is carried out. There are many ways to change the method.

According to the present invention, workpieces made of materials such as non-ferrous metals, magnets, ceramics, glass, or plastics, in particular workpieces of low strength, which cannot be used for the magnetic workpiece fixing method, are easily fixed and machined. Provided are a melt / coagulation fixative for machining and a machining method for use.

Claims (4)

A melting / solidifying fixative for machining comprising a mixture of 10 to 95% by weight of powdered rosin and 90 to 5% by weight of unheated powdered shellac resin. The melting / solidifying agent for machining according to claim 1, wherein the mixing ratio of the powdered rosin is 35 to 80% by weight. The melting / solidification fixing agent for machining according to claim 1 or 2, wherein the shellac resin and the rosin in powder form are mixed and pressed into a predetermined solid shape by pressing. Heat-melting the melting / solidification fixing agent (13) for machining according to claim 1 and applying it to the surface of the workpiece holding table (21); Pressing the workpiece 12 on the workpiece 13 applied to the surface of the workpiece holding table 21, pressing the workpiece 12 on the workpiece holding table 21 to increase the temperature of the fixing agent 13 Fixing the workpiece 12 to the surface of the workpiece holding table 21 by lowering to the solidification temperature and solidifying the fixing agent 13, The workpiece 12 is machined, and after completion of machining, the workpiece 12 and the workpiece holding table 21 are washed with a glycol-ether-based aqueous solution, and the fixing agent 13 is washed with the glycol. -Dissolving in an aqueous solution of an ether system.

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