JP2007050459A - Dustproof member, die for manufacturing elastic member, and manufacturing method of elastic member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive manufacturing method capable of stably exhibiting a foreign matter intrusion prevention function when manufacturing a sliding elastic member 5 contacting to the member of a machine tool in a dustproof member for preventing the foreign matter from intruding into the clearance between the sliding surfaces of the machine tool. <P>SOLUTION: Mold surfaces 23, 23 of the dies 21, 22 for forming the elastic member 5 are made to be shapes capable of forming an inclination part 7 on the elastic member 5. The foreign matters are prevented from intruding by bringing the tip end part 8 of the inclination part 7 into close contact with the sliding surface. An R-surface or an embossed surface is formed at the tip end part 8. In the dies 21, 22, a split face 24 is set at the position nearer the base part side by the distance d of 0.5 mm or more and 3.0 mm or less than the position (sign 28) corresponding to the tip end part 8 of the inclination part 7. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a dustproof member used in a dustproof device that prevents foreign matter from entering between sliding surfaces of a machine tool.

For example, in a machine tool such as a lathe, if foreign matter such as cutting powder enters between the sliding surfaces of the fixed base and the movable base, the sliding surface is damaged by the biting, and the processing accuracy is adversely affected. In view of this point, a sliding surface dustproof device for preventing intrusion of foreign matter has been proposed. For example, in the configuration of Patent Document 1, a rubber slide seal having a lip portion that is in close contact with the sliding surface is provided, thereby preventing entry of foreign matter. Moreover, in patent document 1, the closed space is formed in the inside of a slide seal, compressed air is supplied, and when the slide seal is damaged, the pressure of the compressed air is reduced, so that the slide seal can be determined automatically. Proposed configuration.
Japanese Patent Laid-Open No. 5-96443 (summary)

  The slide seal described in Patent Document 1 is likely to have variations (individual differences) in the shape of the tip of the lip portion that is in sliding contact with the sliding surface due to burrs at the time of rubber molding. It is difficult to demonstrate. In order to eliminate this variation, it is conceivable to polish the tip of the lip, etc., but even if the shape after polishing is slightly different, the seal performance will be greatly affected, so strict processing is required. This is also not preferable from the viewpoint of manufacturing cost.

  In this respect, Patent Document 1 simply says that if the slide seal is broken, it can be automatically detected due to a decrease in air pressure, and how stably the foreign matter intrusion prevention function of the slide seal (from the beginning of manufacture) is demonstrated. There is no mention of what to do.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a dust-proof member that can stably exhibit a foreign matter intrusion prevention function and that is inexpensive to manufacture.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  According to a first aspect of the present invention, there is provided a dustproof member for a dustproof device configured as follows to prevent foreign matter from entering between sliding surfaces of a machine tool. An elastic member that slides in contact with a member of the machine tool and a reinforcing member that is fixed to the elastic member. The elastic member includes an inclined portion, and the tip portion of the inclined portion is configured to contact the member of the machine tool, and the tip portion is an R surface having a radius of 0.01 mm to 1.0 mm. Yes.

  Thereby, by removing the sharpness of the edge of the tip portion of the inclined portion, it is possible to suppress the amount of abrasion of the tip portion due to the use of the dust-proof member, and to improve the durability of the dust-proof member.

  In the dustproof member, it is preferable that a textured surface is formed at least at the tip. Thereby, since the sliding resistance which generate | occur | produces in a front-end | tip part can be reduced, durability of a dustproof member can be improved.

  According to the 2nd viewpoint of this invention, the dustproof member for dustproof devices which prevent the foreign material penetration | invasion between the sliding surfaces of a machine tool comprised as follows is provided. An elastic member that slides in contact with a member of the machine tool and a reinforcing member that is fixed to the elastic member. The elastic member is provided with an inclined portion, and a tip portion of the inclined portion is configured to contact a member of the machine tool, and at least the textured surface is formed at the tip portion.

  Thereby, since the sliding resistance which generate | occur | produces in the front-end | tip part of the said inclination part can be reduced, durability of a dustproof member can be improved.

  According to a third aspect of the present invention, there is provided a manufacturing die for forming an elastic member that slides in contact with a member of the machine tool in a dust-proof member that prevents foreign matter from entering between the sliding surfaces of the machine tool. The following configuration is provided. That is, the mold surface of the manufacturing mold is shaped so that an inclined portion can be formed on the elastic member. Further, the split surface of the manufacturing mold is set at a position separated by a distance of 0.5 mm or more and 3.0 mm or less from a position corresponding to the tip of the inclined portion.

  When the elastic member is molded using this manufacturing mold, burrs caused by the split surface at the time of molding are formed at a position away from the tip of the inclined portion in the elastic member. Therefore, the burr hardly affects the shape of the tip part, and the process of removing the burr can be performed without cutting the tip part. That is, a dust-proof member that stably exhibits the foreign substance intrusion prevention function can be manufactured at low cost.

  In the mold for manufacturing the elastic member, the mold surface of the mold for manufacturing has a shape having an R surface having a radius of 0.01 mm or more and 1.0 mm or less at a position corresponding to the tip of the inclined portion. It is preferable. Or it is preferable that the embossing is given. Thereby, the elastic member (dust-proof member) whose durability has been improved by the R surface or the textured surface as described above can be obtained at a very low cost by transfer from the mold surface of the manufacturing mold.

  According to a fourth aspect of the present invention, the following manufacturing method of an elastic member that slides in contact with a member of the machine tool in a dust-proof member that prevents foreign matter from entering between the sliding surfaces of the machine tool Is provided. In other words, the elastic member has a mold surface that can be formed with an inclined portion, and is closer to the base side by a distance of 0.5 mm or more and 3.0 mm or less than the position corresponding to the tip of the inclined portion. A step of forming the elastic member using a manufacturing mold having a split surface.

  According to this manufacturing method, the burr generated due to the split surface at the time of molding is formed at a position close to the base side from the distal end portion of the inclined portion in the elastic member. Therefore, the burr hardly affects the shape of the tip portion, and the removal of the burr can be performed without cutting the tip portion. That is, a dust-proof member that stably exhibits the foreign substance intrusion prevention function can be manufactured at low cost.

  Next, embodiments of the invention will be described. FIG. 1 is a cross-sectional view of an essential part showing a dustproof device according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a portion A in FIG.

  FIG. 1 is a cross-sectional view of a main part of a dustproof device 2 attached to a lathe 1 as a machine tool. The lathe 1 includes a fixed base 11 and a movable base 12. Are provided with sliding surfaces 11a and 12a that slide relative to each other. The movable table 12 is configured to be movable in the direction of the thick arrow in FIG.

  The dustproof device 2 is provided to prevent foreign matter such as chips from entering between the sliding surfaces 11a and 12a. The dustproof device 2 is fixed to the movable base 12 by bolts 3 ( (Slide seal) 4 is provided. The dustproof member 4 includes a substantially block-shaped elastic member (lip member, seal member) 5 made of rubber and a flat reinforcing plate (reinforcing member) 6 fixed to the elastic member 5.

  An end portion (lower end) of the elastic member 5 is provided with an inclined portion (lip portion, seal portion) 7, and the tip end portion 8 is configured to come into contact with the sliding surface 11 a of the fixed base 11. The inclined portion 7 is provided so as to extend obliquely toward the sliding surface 11a. Furthermore, a recess 9 is provided in the vicinity of the inclined portion 7, and the inclined portion 7 is slightly thinned by the recess 9, so that the inclined portion 7 can be easily elastically deformed.

  The elastic member 5 is made of oil-resistant synthetic rubber (NBR) and has a hardness of about 80 to 90 °. On the other hand, the reinforcing plate 6 is made of SS400, and is subjected to black dyeing. The elastic member 5 and the reinforcing plate 6 are integrally bonded and fixed by a method such as vulcanization bonding, whereby the dustproof member 4 is configured.

  The dustproof member 4 is fixed to the movable base 12 so as to press the tip 8 of the inclined portion 7 of the elastic member 5 with a slight pressing allowance (for example, about 0.5 mm to 1 mm). As a result, the tip portion 8 of the inclined portion 7 is in close contact with the sliding surface 11a, and a seal structure is realized.

  FIG. 2 is an enlarged view of a region surrounded by a broken line indicated by symbol A in FIG. 1 in order to explain in detail the tip 8 of the inclined portion 7 that contacts the sliding surface 11a. As shown in FIG. 2, the tip portion 8 of the inclined portion 7 is substantially an R surface (arc surface) 15, although there are fine irregularities on a textured surface 16 described later. Thus, by removing the sharpness of the edge of the tip portion 8 of the inclined portion 7 to form the R surface, the amount of wear of the tip portion 8 due to actual use (sliding with the sliding surface 11a) can be reduced. Can do. As a result, the close contact between the tip 8 and the sliding surface 11a can be stably maintained for a long time, and the durability of the elastic member 5 and the dustproof member 4 can be improved.

  The radius r of the R surface 15 is preferably 0.01 mm or more and 1.0 mm or less. This is because the sharpness of the edge of the tip 8 cannot be substantially removed by the R processing of less than 0.01 mm, whereas the sealing performance of the elastic member 5 is deteriorated by the R processing exceeding 1.0 mm.

  Furthermore, in the present embodiment, a so-called embossed surface 16 is formed on the R surface 15 of the distal end portion 8 and its peripheral region to form a satin finish having fine irregularities (see FIG. 2). By this textured surface 16, the sliding resistance between the sliding surface 11a and the tip 8 can be reduced, and the durability of the elastic member 5 (dustproof member 4) can be improved.

  The embossed surface 16 preferably has an embossed depth of 10 μm or less. This is because an embossed surface having a depth exceeding 10 μm causes a decrease in sealing performance.

  Next, a method for producing the elastic member 5 by molding will be described with reference to FIG. FIG. 3 is an explanatory view showing a process of forming the elastic member of the dustproof member.

  As shown in FIG. 3A, the elastic member 5 is molded by two manufacturing dies 21 and 22. Inside the molds 21 and 22 for manufacturing, mold surfaces 23 and 23 corresponding to the shape of the elastic member 5 are provided. That is, the mold surface 23 has a shape capable of forming the inclined portion 7 and the recessed portion 9 and the like in the elastic member 5 by molding.

  The split surface 24 on one side (the side on which the inclined portion 7 is formed) of the split surfaces 24 and 25 of the manufacturing molds 21 and 22 corresponds to the distal end portion 8 of the inclined portion 7 in the elastic member 5. It is set to a position (a position offset to the base side or the base side of the inclined portion 7) away from the position (reference numeral 28) by the distance d.

  Therefore, when the molds 21 and 22 are released from the mold after molding, the burrs 30 and 31 remain on the elastic member 5 at a position corresponding to the split surfaces 24 and 25 as shown in FIG. However, since the burr 30 corresponding to the split surface 24 is formed at a position away from the front end 8 of the inclined portion 7 (substantially by a distance d), the burr 30 and the processing for removing the burr 30 are performed at the front end 8 Does not affect the shape. Therefore, the shape of the tip portion 8 of the inclined portion 7 can be stably formed, and the dust-proof member 4 that stably exhibits the sealing function (foreign matter intrusion prevention function) can be obtained.

  The distance d (see FIG. 3A) is preferably 0.5 mm or more and 3.0 mm or less. If it is less than 0.5 mm, the burr 30 is formed too close to the tip 8 and difficult to finish. On the other hand, if it exceeds 3.0 mm, the degree of undercut becomes large and it becomes difficult to release. .

  Furthermore, in this embodiment, the shape corresponding to the R surface 15 and the embossed surface 16 shown in FIG. 2 is formed on the mold surface 23 side of the mold surface (reference numeral 28) corresponding to the tip 8 of the inclined portion 7. Is formed. Therefore, since the R surface 15 and the textured surface 16 can be formed on the elastic member 5 by simply forming, the elastic member 5 (dust-proof member 4) that can stably exhibit an excellent foreign matter intrusion preventing effect can be obtained at low cost. Can be supplied.

  As described above, the dustproof member 4 of the present embodiment includes the elastic member 5 that slides in contact with the sliding surface 11 a of the fixed base 11, and the reinforcing plate 6 that is fixed to the elastic member 5. . The elastic member 5 is provided with an inclined portion 7 so that the tip portion 8 of the inclined portion 7 is in contact with the fixed base 11 of the lathe 1, and the tip portion 8 has a radius of 0.01 mm or more and 1 The R surface 15 is 0.0 mm or less.

  Therefore, by removing the sharp edges of the tip 8, the amount of wear of the tip 8 can be suppressed, and the durability of the elastic member 5 can be improved.

  Moreover, since the embossed surface 16 is formed at the tip portion 8, the sliding resistance with the sliding surface 11a can be reduced, and the durability of the elastic member 5 can also be improved.

  Further, the molds 21 and 22 for manufacturing the elastic member 5 shown in FIG. 3 are formed such that the mold surfaces 23 and 23 can form the inclined portion 7 on the elastic member 5. The split surfaces 24 of the molds 21 and 22 are set at positions separated by a distance d not less than 0.5 mm and not more than 3.0 mm from a position (reference numeral 28) corresponding to the tip 8 of the inclined portion 7. ing.

  When the elastic member 5 is molded using the manufacturing molds 21 and 22, the burr 30 caused by the split surface 24 is located away from the front end portion 8 of the inclined portion 7 (approximately the distance d) in the elastic member 5. Will be formed. Therefore, since the burr 30 itself and the process of removing the burr 30 do not affect the shape of the tip portion 8, the shape of the tip portion 8 of the inclined portion 7 can be stably formed. That is, the dust-proof member 4 that stably exhibits the foreign matter intrusion preventing function can be obtained. Moreover, since it is not necessary to adjust the shape of the front-end | tip part 8 at a post process, the manufacturing cost of the elastic member 5 can be reduced also in this meaning. Specifically, in this embodiment, it is possible to use the product as it is without adjusting the shape of the tip 8 by polishing or the like by simply removing the two burrs 30 and 31.

  Furthermore, a shape corresponding to the R surface 15 and the embossed surface 16 shown in FIG. 2 is formed at a position corresponding to the tip portion 8 of the inclined portion 7 of the mold surface 23. Therefore, the shape of the R surface or the embossed surface can be transferred to the elastic member 5 simply by molding, so that the dust-proof member 4 having an excellent effect of preventing the entry of foreign matter can be supplied at a very low cost.

  Next, an experiment conducted by the present applicant to confirm the effect of the dustproof member 4 of the present embodiment will be described below. In this confirmation experiment, first, a dustproof member 4 according to the present embodiment having a total length of 300 mm and a width of 29.5 mm was prepared. An R surface 15 is formed on the tip 8 of the inclined portion 7 of the elastic member 5 in the dust-proof member 4 by molding with the molds 21 and 22. The radius of the R surface 15 was 0.26 mm as measured using a projector. Further, a textured surface 16 is formed on the tip 8 by transfer from the mold surface 23 of the molds 21 and 22. The hardness of the elastic member 5 was JIS-A 9.8N and was 79.3 °.

  On the other hand, a dustproof member having a total length of 300 mm and a width of 25.1 mm was prepared as a comparative product. Even in this comparative product, an R surface was formed at the tip of the inclined portion of the elastic member. However, the R surface was formed by polishing without depending on the transfer of the mold surface, and the embossed surface was not formed. The radius of the R surface was adjusted to be the same value (0.26 mm) as that of the above-described embodiment product. The hardness of the comparative elastic member was 78 ° as measured under the same conditions as described above.

  And when the dust resistance member 4 which concerns on this embodiment was pressed on the sliding surface with the pressing allowance of 0.5 mm and the sliding resistance was measured with the UG friction coefficient measuring machine, it was 22.5 gf / cm. On the other hand, when the sliding resistance of the comparative product was measured under the same conditions, it was 27.0 gf / cm. From the above, it can be seen that the dustproof member 4 of the present embodiment has a lower sliding resistance than the comparative product.

  Also, using a bench tester, the sliding speed is 100 to 750 mm / sec, the above-mentioned holding allowance is 0.5 mm, and the amount of foreign matter leaked when sliding on the sliding surface 1 million times. It was measured. In this experiment, reduced iron powder was used as a foreign substance (cut powder) and mixed with cutting oil at a predetermined ratio. Then, in the dustproof member 4 of the present embodiment, the leakage amount was 0.49 g, whereas the comparative product was 0.52 g. From the above, it can be seen that the dust-proof member 4 of the present embodiment can reduce the intrusion of foreign matter compared to the comparative product. In the present embodiment, the shape of the tip 8 is secured by the mold surfaces 23 of the molds 21 and 22. Therefore, if the experiment is performed with an increased number of slides, the superiority of the dustproof member 4 of the present embodiment can be obtained. I guess it will be clearer.

  Although the preferred embodiment of the present invention has been described above, the above configuration can be changed as follows, for example.

  The dustproof device 2 having the above-described configuration can be installed at another place on the lathe 1, that is, at another place where the foreign matter is not entrapped against the sliding surface. Moreover, it can install in other machine tools, such as not only the lathe 1, but a milling machine, for example.

  Further, in the above-described configuration, the elastic member 5 itself can be directly subjected to the embossing process, so that the embossed surface 16 can be formed on the distal end portion 8 of the inclined portion 7 and its periphery. Further, the elastic member 5 can be modified such that the embossed surface 16 is omitted and only the R surface 15 is formed, or the R surface 15 is omitted and only the embossed surface 16 is formed.

  Further, the dustproof member 4 can be changed to a configuration in which the reinforcing plate 6 is omitted and the elastic member 5 is directly fixed to the movable base 12 with the bolt 3.

The principal part sectional view showing the dustproof device concerning one embodiment of the present invention. The enlarged view of the A section of FIG. Explanatory drawing which shows the process of shape | molding the elastic member of a dustproof member.

Explanation of symbols

1 Lathe (machine tool)
2 Dust-proof device 3 Bolt 4 Dust-proof member 5 Elastic member 6 Reinforcement plate (reinforcement member)
DESCRIPTION OF SYMBOLS 7 Inclination part 8 Tip part 9 Indentation part 11 Fixed base 11a Sliding surface of a fixed base 12 Movable base 12a Sliding surface of a movable base 15 R surface 16 Wrinkle surface

Claims (7)

In dust-proof members used in dust-proof devices that prevent foreign matter from entering between sliding surfaces of machine tools,
The dust-proof member includes an elastic member that contacts and slides on the member of the machine tool, and a reinforcing member that is fixed to the elastic member.
The elastic member includes an inclined portion, and the tip portion of the inclined portion is configured to contact the member of the machine tool, and the tip portion is an R surface having a radius of 0.01 mm to 1.0 mm. A dustproof member characterized by having   The dust-proof member according to claim 1, wherein a grained surface is formed at least at the tip portion. In dust-proof members used in dust-proof devices that prevent foreign matter from entering between sliding surfaces of machine tools,
The dust-proof member includes an elastic member that contacts and slides on the member of the machine tool, and a reinforcing member that is fixed to the elastic member.
The elastic member includes an inclined portion, and a tip portion of the inclined portion is configured to come into contact with a member of the machine tool, and at least a tip surface is formed on the tip portion. . In a mold for manufacturing an elastic member that slides in contact with a member of the machine tool in a dust-proof member that prevents foreign matter from entering between the sliding surfaces of the machine tool,
The mold surface of the manufacturing mold is shaped so that an inclined portion can be formed on the elastic member,
Further, the split surface of the manufacturing mold is set at a position separated by a distance of 0.5 mm or more and 3.0 mm or less from a position corresponding to the tip of the inclined portion. Mold for manufacturing parts. A mold for manufacturing the elastic member according to claim 4,
The mold surface of the manufacturing mold is shaped to have an R surface having a radius of 0.01 mm or more and 1.0 mm or less at a position corresponding to the tip of the inclined portion. Mold. A mold for producing the elastic member according to claim 4 or 5,
The mold surface for manufacturing an elastic member is characterized in that the mold surface of the manufacturing mold is textured at least at a position corresponding to the tip of the inclined portion. In the method of manufacturing an elastic member that slides in contact with a member of the machine tool in a dust-proof member that prevents foreign matter from entering between the sliding surfaces of the machine tool,
The elastic member has a mold surface having a shape capable of forming an inclined portion, and is split at a position close to the base side by a distance of 0.5 mm or more and 3.0 mm or less from a position corresponding to the tip of the inclined portion. The manufacturing method of the elastic member characterized by including the process of shape | molding the said elastic member using the metal mold | die for manufacture set.

Images