JPH0724961B2 - Cutting edge chip for simple brazing - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cutting blade tip formed of cemented carbide or the like and brazed and fixed to the tip of a tool, and in particular, labor for brazing. The present invention relates to a simple cutting blade tip for brazing that facilitates the brazing work.

[Prior Art] When brazing a cutting edge tip to a shank of a carbide tool,
As shown in FIG. 4, after washing the tip seat 13 formed on the tip 11 and the shank 12, flux 14 is applied to the brazing surface. And a plate-shaped brazing material that matches the shape of the brazing surface
Cut 15 and insert this brazing material on the inner surface of the tip seat 13 of the shank 12.
15 is attached, the chip 11 is placed on it, and it is pressed with a wire or the like, and this is heated by various methods.

Also, in order to reduce the brazing stress, a copper plate between the brazing surfaces,
When sandwiching a cushioning material made of stainless steel mesh, etc., the cushioning material is formed according to the shape of the brazing surface, and the brazing material is formed and arranged on both sides by the above method. .

[Problems to be Solved by the Invention] However, in the conventional technique as described above, the brazing material, the flux, and the cushioning material have to be prepared at the brazing site, and the work environment at the site tends to be complicated. Further, since the laborious work of forming the brazing material and the cushioning material in conformity with the shape of the brazing surface and applying the flux must be performed, the work efficiency cannot be improved. Further, there are problems that the stability of the brazing material and the cushioning material becomes poor, the brazing portion becomes non-uniform, and the strength becomes insufficient. Furthermore, since the chips easily oxidize during brazing, they have to be placed in a strong reducing flame and the heating method and type of heating furnace must be limited. Could be damaged. In addition, when handling the tip when putting it on the tip seat and pressing it with wire etc.,
Since the chip is exposed in a bare state, there is a problem that dirt may be attached during this period to further impair the cleanability.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a cutting blade tip that is brazed and fixed to a tip seat of a shank, and has a brazed surface of a tip body. In addition, a coating layer containing a brazing material and flux is formed, and the entire chip body on which the coating layer is formed is wrapped with a flux film.

[Operation] With the cutting blade tip for simple brazing as described above, it is possible to prepare for brazing just by placing the tip on the tip seat, and to prepare flux, brazing material, cushioning material, etc. on site. There is no need for detailed work such as molding them or arranging them on the brazing surface. Moreover, since the chip body is wrapped in a flux film, the chip can be prevented from becoming dirty during handling, the chip is less likely to be oxidized during brazing, and the flux of this flux film and the coating layer is Since it melts and dissolves the oxides and impurities of the material, cleaning can be achieved.

EXAMPLES Examples of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 show a first embodiment in which the present invention is applied to a chip with a three-sided brazing, and the lower surface 1a of the chip body 1 having a substantially rectangular parallelepiped shape and the two adjacent side surfaces 1b and 1c are brazed. The coating layer 2 containing the material and the flux is integrally formed. As the coating layer 2, a layer in which a brazing material and a flux are laminated to form a layer, or a layer in which the flux is dispersed in the brazing material may be appropriately adopted, and the thickness of the brazing material, There are no particular restrictions on the components of the brazing material or the flux.

The coating layer 2 is usually formed into a desired shape in advance and bonded to the chip body 1 by heating, pressing, or adhering, but the material may be directly heated and pressed to fix the material.

The entire chip body 1 and coating layer 2 are wrapped with a flux film 3. This flux film 3
Is to prevent the exposed portion of the chip body 1 from being oxidized when the relevant portion is heated during brazing.
The main components are potassium fluoride and sodium fluoride.

Next, a method of brazing the cutting edge tip thus configured will be described. Since the cutting blade tip is wrapped with the flux film 3, dirt does not adhere to the tip body 1 during handling, and the action of the flux film 3 makes it difficult to oxidize. There is no need to put it in a strong reducing flame, and the stability of the chips is good, so the heating method and the type of heating furnace are not selected. Therefore, it is possible to carry out one by one with a torch or mass-produce with a decomposed ammonia gas atmosphere furnace or the like.

As shown in FIG. 2, when the cutting blade tip is placed on the tip seat of the shank 4 and heated, the flux in the coating layer 2 and the flux film 3 are melted, and the oxides and impurities of the material are dissolved and cleaned. Further, the brazing material is melted and brazing is performed. At this time, since the brazing material and the flux are evenly arranged on the brazing surface, the thickness of the brazing layer does not deviate. Further, the amounts of the brazing material and the flux are also set to required values in advance, and defects due to excess or deficiency do not occur.

FIG. 3 shows a second embodiment of the present invention, in which the coating layer 2a
Is a coating 6 made of brazing material and flux on both sides of the cushioning material 5.
Are formed.

The cushioning material 5 is formed by joining a copper plate, a stainless mesh or the like into a predetermined shape, and relaxes the brazing stress to prolong the life of the cutting edge tip. This coating layer 2a
In order to form the above, a method of sequentially stacking materials on the chip body 1 or a method of forming the coating film 6 on the cushioning material 5 and then joining the film to the chip body 1 is adopted.

The method of brazing the cutting edge tip of this example to the tip seat, and its action and effect are almost the same as those of the first embodiment, but the labor of arranging the brazing material and the flux on both sides of the cushioning material is omitted, Great effect can be obtained.

[Effects of the Invention] As described in detail above, the present invention is a cutting blade tip that is brazed and fixed to a tip seat of a shank, and a coating layer containing a brazing material and a flux on a brazed surface of a tip body. As a result, since the flux, the brazing material, the cushioning material, etc. are prepared on site, the detailed work of molding them and arranging them on the brazing surface is not required, and the brazing work is simplified. Also, the cutting edge tip can be stably placed on the tip seat,
Also, the standardization of the material brings about an excellent effect that uniform brazing can be performed regardless of the skill of the operator.
Moreover, since the tip body of this cutting edge tip is wrapped in the flux film, it is possible to prevent dirt from adhering to the tip body during handling, and to use this flux film when brazing. Since the flux of the coating layer melts to dissolve the oxides and impurities of the material, the cutting edge tip can be brazed in an extremely clean state.
Furthermore, since the cutting blade tip is less likely to oxidize due to the action of the flux film, it is not necessary to place it in a strong reducing flame, and the range of choices for the heating method and the type of heating furnace is greatly expanded. , It becomes possible to perform brazing with the device.

[Brief description of drawings]

FIG. 1 is a perspective view showing a cutting blade tip of a first embodiment of the present invention, FIG. 2 is a perspective view showing a state where the cutting blade tip is mounted on a tip seat of a shank, and FIG. 3 is a perspective view of the present invention. FIG. 4 is a perspective view showing a second embodiment, and FIG. 4 is a perspective view showing an example of conventional brazing. 1 ... Chip body, 2, 2a ... Coating layer, 4 ... Shank, 5 ... Buffer material, 6 ... Coating.

Claims (2)

[Claims] 1. A cutting blade tip which is brazed and fixed to a tip seat of a shank, wherein a brazing material and a coating layer containing flux are integrally formed on a brazed surface of the tip body. A simple cutting blade tip for brazing, characterized in that the entire tip body on which a coating layer is formed is wrapped with a flux film. 2. The simple brazing as set forth in claim 1, wherein the coating layer is formed by forming a coating made of a brazing material and a flux on both surfaces of a cushioning material for relaxing the brazing stress. Cutting blade tip.