JP2947376B2 - Machine tool chip removal scraper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip removing scraper for a machine tool, and more particularly to an improvement of a chip removing scraper used for a machine tool such as a lathe and a milling machine.

[0002]

2. Description of the Related Art In order to prevent foreign matter such as chips from being caught in a sliding surface between a head of a machine tool such as a lathe and a milling machine and a tool post and a tailstock, a short edge of a movable member is usually provided with an edge. The scraper is attached by bringing the portion into contact with the sliding surface. As the scraper A, a rubber scraper whose base is reinforced with a metal plate B as shown in FIG.
As shown in (b), when mounted with the fixing bolt C, the tip of the edge portion may bend due to the tightening force and the chips may not be sufficiently removed. As disclosed in JP-A-58-191934, the inside of the cross section of the scraper is reinforced with an iron plate, or as disclosed in Japanese Utility Model Application Laid-Open No. 60-183138, the mounting bolt hole is formed by a metal sleeve. It has been proposed to prevent an excessive stress from being generated in the rubber scraper portion.

[0003] Although the scraper according to the above-mentioned prior art can solve the warpage of the edge portion at the time of bolt installation, it is necessary to form a rubber edge portion in combination with a metal plate, which is troublesome and expensive. In addition, the adhesive interface between the rubber portion and the reinforcing metal plate tends to be peeled off due to the difference in elastic deformation between the rubber portion and the reinforcing metal plate. In view of this point, the applicant of the present application has proposed a scraper in which the rubber scraper portion is integrally molded with short fiber reinforced rubber and the above-described deformation is prevented by the strength of the short fiber reinforced rubber itself (Japanese Utility Model Laid-Open No. 2-74146).

[0004]

However, although the improved scraper completely prevents the warpage of the edge when the bolt is mounted, the scraper has a large frictional force because the tip of the scraper is made of a rubber material. There was a problem of growing.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a machine tool chip removing scraper which is easy to manufacture, has good long-term durability, and has a low friction coefficient at a scraper portion. It was made for the purpose.

That is, a machine tool chip removing scraper according to the present invention comprises: a substrate portion reinforced by a rigid plate;
A scraper portion formed into a knife-edge cross section at one end of the substrate portion is formed integrally with short fiber reinforced rubber,
The short fibers added to the short fiber reinforced rubber are oriented so as to be perpendicular to the sliding surface of the scraper portion, and a part of the short fibers is exposed on the sliding surface by buffing. It is assumed that.

[0006]

In the present invention, a steel plate is mainly used as the rigid plate 4, and as shown in FIG. 1, a strip-shaped plate which is merely applied to the substrate portion 2 of the scraper body 1 made of short fiber reinforced rubber as described later. It is enough if it is shaped.
The rigid plate 4 is not necessarily required if the required rigidity can be obtained only with the short fiber reinforced rubber. In the scraper body 1 according to the present invention, a substrate portion 2 reinforced by the rigid plate 4 and a scraper portion 3 formed in a knife edge shape at one end of the substrate portion 2 are provided on a sliding surface 3A of the scraper portion 3. The short fibers 5... 5 are oriented integrally in a perpendicular direction (arrow X) with short fiber reinforcing rubber G, and a part of the short fibers 5 is exposed on the sliding surface 3A by buffing.

[0007] The short fiber reinforced rubber G has a higher rigidity than rubber in which no fiber is mixed, and the short fibers 5... 5 are oriented.
The warpage at the time of fastening as shown in (b) is prevented.
Furthermore, since a part of the short fibers 5... 5 is exposed on the sliding surface 3A by buffing, direct contact of the rubber portion is reduced, and the friction coefficient is reduced. As the short fibers, those having an aspect ratio of 5 or more and a thickness of 1 to 10 denenyl are preferably used, and the addition amount is 2 to 100 parts per 100 parts of rubber. If the amount is less than 2 parts, fiber reinforcement for the rubber cannot be obtained, and if the amount is more than 100 parts, not only does it become difficult to uniformly mix the rubber, but also the flowability of the mixed rubber deteriorates and molding becomes difficult. The preferred range of amounts is from 10 to 30 parts of the above.

[0008]

Next, an embodiment of the present invention will be described. As rubber materials, a compounded rubber of acrylonitrile-butadiene rubber shown in Table 1 and nylon short fibers having an aspect ratio of about 37 and a thickness of 6 denier as short fibers were prepared. And 15 parts, and the calender roll is used to impart the orientation to the short fibers in the rubber, and the orientation of the rubber sheet material is adjusted so that the orientation is perpendicular to the sliding surface. The scraper 1 reinforced by the steel plate 4 shown in (a) and (b) is vulcanized and then the sliding surface 3A is buffed to reduce a part of the short fiber to about 0.1 mm.
1 to 0.3 mm was exposed, and a forced sliding test was performed using a test apparatus shown in FIG. The above-mentioned forced sliding test apparatus W holds the pair of scrapers 1 in contact with the sliding surface S, and drives the reciprocating rod R to reciprocate as shown by the arrow, thereby cutting chips put between the scrapers 1. , And the amount of scraping P ′ of the oil mixture P is measured.

[0009]

[Table 1] Acrylic nitrile butadiene rubber 100 parts by weight Stearic acid 1 亜 鉛 Zinc white 4 〃 Anti-aging 224 1 カ ー ボ ン Carbon HAF 60 〃 Process oil 5 促進 Accelerator TT 1.5 〃 Accelerator CZ 1.5 硫黄 Sulfur 0.5 〃

FIG. 4 shows the average relationship of the amount of chip loss to the number of times of sliding by the test apparatus W.
In addition, in FIG. 4, the comparative example shows the test results of a scraper molded in the same shape with rubber in which no short fiber is mixed.

Next, as a rubber material, a mixture obtained by adding 20 parts of the nylon short fiber to 100 parts of a rubber component of the rubber mixed with the acrylonitrile-butadiene rubber is shown in FIGS.
Tightening torque (kgf-cm) when the scraper shown in (a) and (b) is formed and tightened with bolt B as shown in FIG.
When the relationship between the height of the edge portion and the lifting amount (mm) of the edge portion was measured, the result shown in FIG. 6 was obtained. In the comparative example, a scraper of the same type was molded using only a compounded rubber containing no short fiber.

[0012]

As described above, according to the present invention, since the rubber body forming the scraper is made of rubber mixed with short fibers having orientation, the rigidity of the rubber member itself is increased, and the rubber member is used as a reinforcing member having a complicated structure. At the same time, the scraper can be easily formed without any trouble, and at the same time, since a part of the short fiber is exposed on the sliding surface, direct contact of the rubber portion is avoided and the friction coefficient is reduced. Also, since the scraper does not bend due to the tightening torque, there is an effect that a stable function is maintained for a long time.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIGS. 2A and 2B are cross-sectional views of an embodiment of the present invention.

FIG. 3 is an explanatory diagram of a test apparatus according to the present invention.

FIG. 4 is a graph showing the relationship between the number of sliding operations and the amount of chip loss.

FIG. 5 is an explanatory view showing a tightening test.

FIG. 6 is a graph of a tightening test result.

FIGS. 7A and 7B are explanatory diagrams of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Machine tool chip removal scraper 2 Substrate part 3 Scraper part 4 Rigid plate 5 Short fiber

Claims (1)

(57) [Claims] 1. A short fiber reinforced rubber comprising a substrate portion reinforced by a rigid plate and a scraper portion formed at one end of the substrate portion with a knife-edge cross-section. Wherein the short fibers added to the scraper are oriented so as to be perpendicular to the sliding surface of the scraper portion, and a part of the short fibers is exposed on the sliding surface by buffing. Powder removal scraper.