JPH0630342Y2 - Fixing structure of blade tip to base metal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to improvement of a fixing structure of a cutting edge tip (including a circular saw and a hole saw) to a base metal in a cutting blade.

<Prior art> Today, various cutting blades have
The one to which a cutting edge tip such as cemented carbide, CBN or ceramic is attached is widely used. And various mounting structures have been proposed, for example, in Japanese Utility Model Laid-Open No. 61-112825.
Like the blade tip of the saw described in Japanese Patent Publication, in order to secure the fixing of the blade tip, insert the blade tip into the receiving recess of the edge of the saw base metal and join it to the front and rear surfaces of the blade tip. It is also proposed to form a chip positioning groove that fits in front of and behind the recess.

Further, the inventor of the present invention, in a base metal of a cutting blade to which a cutting edge tip is attached and used, has a concave portion for receiving both front and rear surfaces of the cutting edge tip, and the base of the concave portion We have devised a base metal for a cutting blade that has small holes penetrating through the front and back (Actual No. Sho 63-70820). This invention was intended to ensure the pouring of a silver braze or an adhesive used for joining the cutting edge tip to the base metal and to complete the joining.

In this way, with conventional cutting blades, when attaching the cutting edge tip to the base metal, it is a natural requirement to use brazing with silver braze or the use of adhesive, and on the assumption that Was there.

<Problems to be solved by the device> However, brazing and the use of an adhesive require a lot of time for the joining process.

For example, in the case of a saw blade equipped with a metal cutting edge tip such as cemented carbide, the following steps are required.

 Fix the blade tip to the base metal with brazing.

Since the base metal is distorted by heating when brazing, the base metal distortion is corrected by hitting with a hammer or the like.

Since the metal structure of the cutting edge tip changes due to heating during brazing, it is necessary to perform annealing.

Since the base metal is distorted due to the heating during annealing, it is tapped again with a hammer or the like to correct the base metal distortion.

 Polish the brazed area.

In this polishing, it is necessary to perform rough polishing for correcting the lateral displacement of the cutting edge tip and then perform final polishing.

Moreover, the high temperature (about 680 ° C.) during brazing adversely affects the structure of the metal cutting edge tip. That is, the metal cutting edge tip is finished to have the best characteristics at the time of completion of itself, but the characteristics are deteriorated by heating with brazing at the time of mounting.

Further, some ceramic blade tips have a problem that the adhesiveness of the adhesive is not sufficient, or the types of the adhesive are limited even if they can be adhered.

On the other hand, in Japanese Examined Patent Publication No. 44-30158, a trapezoidal receiving recess is provided in a base metal, and a blade tip is inserted into the receiving recess, and two pieces are provided in the space between the bottom of the blade tip and the bottom of the receiving recess. There is disclosed a structure in which the blade tip is fixed by arranging the plate materials and fastening the plate materials with screws.

However, the screw has an advantage that the tightening strength can be adjusted, but has a problem that the screw is loosened. In particular, a cutting tool rotates at a high speed to perform cutting, and it is likely to cause slight vibrations, which causes looseness.

In addition, it is recognized that a considerable amount of thickness is required for the base metal and the blade tip in order to fix the blade tip by tightening the plate materials together with screws, and the thickness of the base metal is thin and small, about 2 to 3 mm. Tools are perceived as incapable of adapting.

It is also described in the above publication that the wedge tip having a one-piece structure is used instead of the two plate members to fix the cutting edge tip. However, when the wedge plate is used, the wedge is pushed in. If it is not placed, the wedge tends to loosen and cannot be securely fixed, and conversely, if it is pushed in too much, the tooth tends to crack.

<Means for Solving the Problem> According to the present invention, the cutting edge tip can be fixed to the base metal without performing the above brazing or bonding with an adhesive, or without using two plate materials or wedge plates. It provides the structure.

According to the present invention, in the receiving recess (2) of the base metal consisting of the front wall (21), the rear wall (22) and the bottom wall (23), the front surface (31) and the rear surface (33) of the base of the cutting edge tip (3) are provided. ) And the bottom surface (36), the structure of fixing the cutting edge tip to the base metal, the base of the cutting edge tip, abutment surface (31) abutting the front wall and the rear wall of the receiving recess. (3
3) on the front and rear surfaces, respectively, and between the front and rear contact surfaces (3
1) One contact surface (31) is inclined with respect to the other contact surface (33) so that the distance between (33) becomes smaller toward the tip of the tip (3), and the front of the receiving recess (2) Wall (21) and back wall (22) are chips (3)
The front and rear abutment surfaces (31) and (33) are inclined corresponding to the insertion space between the bottom wall (23) of the receiving recess and the bottom surface (36) of the chip.
(24) is formed, and the pressing member (4) is inserted into the insertion space (24), so that the front and rear abutting surfaces (31) (33) of the chip become the front and rear walls (21) (22) of the receiving recess. There is provided a structure for fixing a cutting edge tip, which is press-contacted with (4), to a base metal having the following configuration.

In the present invention, a groove having a thickness substantially equal to the thickness of the base metal (1) is formed on at least one of the front surface (31) and the rear surface (33) of the base of the cutting edge tip (3). The bottom surface of this groove is the contact surface (31) (33), and the pressing member (4) is 1
The plate-shaped pressing member (4), the bottom side of the plate-shaped pressing member (4) is parallel to the bottom wall (23) of the receiving recess, and the upper side of the plate-shaped pressing member is the base of the chip. It is parallel to the bottom surface (36), and in addition, the bottom wall (23) of the receiving recess and the bottom surface (36) of the base of the chip are parallel to each other.
In 3), a recess for introducing the pressing member (25) is formed, and the length between the recess for introducing (25) and the bottom surface (36) of the base of the chip,
Greater than the length between the top and bottom of the pressing member (4),
Insert the corner of the pressing member (4) into the introduction recess (25),
The pressing member is inserted into the insertion space and the introduction recess
The space between the pressing member (4) including (25) and the receiving recess (2) is
The present invention provides a structure for fixing a cutting edge tip to a base metal, which is filled with a filler (S) having adhesiveness.

<Operation> In the present invention, by inserting the blade tip into the receiving recess from the side of the base metal and pushing it up in the tip direction, the front and rear abutting surfaces of the blade tip have front and rear walls of the receiving recess. And a space is formed between the bottom surface of the cutting edge tip and the bottom wall of the receiving recess. This space becomes the insertion space, and by inserting a pressing member that is slightly larger than this insertion space, the cutting edge tip is pushed up slightly and the abutting surfaces before and after that are pressed against the front and rear walls of the receiving recess, ensuring that the table is supported. Fixed on gold.

In particular, a groove having a thickness substantially equal to the thickness of the base metal (1) is formed on at least one of the front surface (31) and the rear surface (33) of the base of the cutting edge tip (3). Since the bottom surface of the base is the contact surface (31) (33), even if the base metal is thin, by inserting the base metal into the groove, It is possible to fix the cutting edge tip with the misalignment eliminated.

Further, the bottom wall (23) of the receiving recess is provided with a recess for introducing the pressing member.
(25) is formed, and the length between the introduction recess (25) and the bottom surface (36) of the base of the chip is larger than the length between the upper side and the bottom side of the pressing member (4). Therefore, by inserting the corners of the pressing member into the introducing recess, the pressing member can be easily inserted and the front and rear abutting surfaces of the chip can be pressed into contact with the front and rear walls of the receiving recess to be fixed. .

Here, the pressing member (4) is in the form of a single plate, the bottom side of the plate-shaped pressing member (4) is parallel to the bottom wall (23) of the receiving recess, and the plate-shaped pressing member (4) is pressed. Since the upper side of the member is parallel to the bottom surface (36) of the base of the chip, and in addition, the bottom wall (23) of the receiving recess and the bottom surface (36) of the base of the chip are parallel, When fitted, the structure does not slip and the structure is extremely difficult to pull out.

Due to such a structure that is hard to come off, it is usually difficult to insert the pressing member, but by providing the introduction recess (25), the pressing member can be sequentially inserted from the corners. The space between the pressing member including the introduction recess and the receiving recess is filled with an adhesive filler so that the pressing member is securely fixed so as not to come off or distort. Was able to be achieved.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

The circular saw base metal (1) of the embodiment is formed with a receiving recess (2) divided by a front wall (21), a rear wall (22) and a bottom wall (23). ), The blade tip (3) is fixed by the pressing member (4).

Grooves having a width substantially equal to the thickness of the base metal (1) are formed on the front and rear surfaces of the cutting edge tip (3), and the bottom surfaces of these grooves are the front contact surface (31) and the rear contact surface (33). ), And both side surfaces of these grooves are the front guide surfaces (32) and (32) and the rear guide surfaces (34) and (34).

The front and rear contact surfaces (31) (33) are inclined in a V shape at an angle (α) of about 35 degrees, so that the distance between the contact surfaces (31) (33) is equal to the tip ( 3) It becomes smaller toward the tip.

No groove is formed in the tip surface (35) and the bottom surface (36) of the cutting edge tip (3).

On the other hand, the receiving recess (2) of the base metal (1) has a shape equal to or larger than the entire shape of the cutting edge tip (3), and has a shape between the front wall (21) and the rear wall (22). The angle (β) of both contact surfaces (31)
It is set equal to the angle (α) between (33).

Therefore, the cutting edge tip (3) can be inserted into the receiving recess from the side of the base metal (Fig. 4).

Next, when the cutting edge tip (3) is pushed up in the distal direction, the front and rear contact surfaces (31) (33) of the cutting edge tip are in front of the receiving recess and the rear wall.
(21) While contacting with (22), a space is provided between the bottom surface (36) of the cutting edge tip and the bottom wall (23) of the receiving recess (Fig. 5).

This space is the insertion space (24), and by inserting the pressing member (4) made of a rectangular metal plate slightly larger than the insertion space (24), the cutting edge tip (3) is slightly (1
It is pushed up by a few hundredths of a millimeter, and the contact surfaces (31) (3
3) is pressed against the front and rear walls (21) and (22) of the receiving recess (first
Figure).

Further, in this embodiment, since the front and rear guide surfaces (32) and (34) are provided on the cutting edge tip (3), the cutting edge tip (3) is in a state in which lateral deviation and slippage are surely prevented. It is fixed to the base metal with (Fig. 10).

In order to facilitate the insertion of the pressing member (4) into the insertion space (24), the introduction recess (25) is formed in the bottom wall (23) of the receiving recess (2).
Are formed. A pressing member is provided in the introduction recess (25).
Align the corners of (4), push in one side (41) first, then
The pressing member (4) can be easily inserted by pushing in the other side (42).

Although the width of the pressing member (4) is smaller than that of the insertion space (24), it may be substantially the same as that of the insertion space (24).

Then, while the bottom side of the pressing member (4) is parallel to the bottom wall of the receiving recess, and the top side of the plate-shaped pressing member is parallel to the bottom surface of the base of the chip, The insertion of the pressing member (4) is advantageous because it eliminates the risk of displacement and increases the contact area.

By the above insertion, the cutting edge tip is surely fixed, but an adhesive agent is additionally used.

As an essential matter, a putty-like adhesive agent (S) having a high viscosity is laid on the bottom surface (36) of the cutting edge tip to the bottom wall (23) of the receiving concave portion (Fig. 1). Even if a large amount of this adhesive is used, there is no problem because it can be polished during the final polishing of the blade tip (3). In this embodiment, the front and rear guide surfaces (32) and (34) of the cutting edge tip do not cause lateral displacement of the cutting edge tip, so that rough polishing is not required as in the conventional case.

In addition to this adhesive (S), the tip direction of the cutting edge tip (first
A low-viscosity adhesive is poured from the arrow a) to bond the front and rear contact surfaces (31) and (33) of the cutting edge tip to the front wall (21) and rear wall (22) of the receiving recess. It is also preferable to do so.

As described above, according to the present invention, since brazing is not required and only the adhesive is used as a supplement, it is sufficient for the next step, and a lot of time and steps can be shortened.

 The cutting edge tip is fixed to the base metal by the above method.

 Polish the bonded area.

The front guide surface (32) may be scraped off during finish polishing, whereby a cutting edge similar to the conventional one can appear. Further, such a groove is essentially unnecessary at the tip of the cutting edge tip protruding from the base metal, and if the tip has the same shape as a normal tip, the above scraping is also unnecessary. The protruding length of the blade tip is arbitrary, and the saw base metal (1) may be polished as shown by the dotted line in FIG. 1 to adjust the protruding length of the blade tip. Further, in this embodiment, no groove is formed in the bottom surface (36) of the cutting edge tip (3), but only one side portion of the bottom surface (36) is extended downward (Fig. 11, Fig. 11). (Fig. 12), this extension (36a)
The insertion space may be covered from one side by. And, in this embodiment, the front and rear guide surfaces (32) and (34) are provided on the cutting edge tip (3), but by making the area large enough, one of the front and rear guide surfaces is provided.
(32) and (34) may be omitted.

In addition to the above, the shape of the cutting edge tip can be variously changed, and may be a triangle as shown in FIG. This cutting edge tip is an isosceles right triangle and the angle between the front and rear contact surfaces (31) (33) is 45 degrees. In this embodiment, the angle (C) of the cutting edge with respect to the center line passing through the center of the saw is 20 degrees.

Further, the front abutment surface (31) is arranged on the center line passing through the center of the saw, and the blade edge is preformed so that the angle of the cutting edge with respect to the center line becomes an appropriate angle such as 20 degrees, or after fixing and polishing. You may.

In addition to the circular saw, the present invention forms a cutting edge on the cylindrical tip,
It can also be applied to a hole saw that cuts a circular hole.

Carbon blade steel, alloy tool steel, aluminum alloy, and other non-ferrous metals are used as the material of the base metal of the cutting blade used in the above circular saw, hole saw, etc., and the tip of the blade is cemented carbide, CBN, cermet, ceramic , Glass and various other materials developed to enhance cutting ability.

<Effects of the Invention> The present invention has been able to provide a structure capable of fixing a cutting edge tip to a base metal without brazing or bonding with an adhesive, or with the use of an adhesive as an auxiliary. is there. Therefore, in the present invention, since brazing is not required, a lot of time and steps can be shortened. Furthermore, there is no room to add high temperature (about 680 ℃) when brazing,
The structure of the cutting edge tip is not adversely affected, and it is possible to fix the cutting edge tip that has been finished to have the best characteristics at the time of completion of itself. Moreover, even in the case of a ceramic cutting edge tip, it is possible to make sure that the adhesive is not adhered, or the use of the adhesive can be supplementary, even if the adhesiveness of the adhesive is not sufficient. It can be fixed.

[Brief description of drawings]

FIG. 1 is a side view of an essential part showing a fixing structure of an embodiment, FIG. 2 is a side view of an essential part of a base metal of the same embodiment, and FIG. 3 is a plan view of an essential part of a base metal of the same embodiment. 4 and 5 are side views of the essential parts showing the fixing step of the same embodiment, FIG. 6 is a side view of the cutting edge tip of the same embodiment, and FIG. 7 is a front view of the cutting edge tip of the same embodiment. 8 is a plan view of the cutting edge tip of the same embodiment, FIG. 9 is a bottom view of the cutting edge tip of the same embodiment, FIG. 10 is a sectional view taken along line XX of FIG. 1, and FIG. 11 is another embodiment. Side view of cutting edge tip, No. 12
FIG. 13 is a bottom view of the cutting edge tip of the same embodiment, and FIG. 13 is a side view showing a fixing structure of still another embodiment. (1) …… base metal, (2) …… receiving recess, (3) …… cutting edge tip,
(4) …… Pressing member, (21) …… Front wall, (22) …… Back wall, (23)
…… Bottom wall, (24) …… Insert space, (25) …… Introduction recess, (3
1) Front contact surface, (32) Front guide surface, (33) Rear contact surface, (34) Rear guide surface, (35) Front end surface, (36) Bottom

Claims (1)

[Scope of utility model registration request] 1. A front surface (31) of a base of a cutting edge tip (3) in a receiving recess (2) of a base metal comprising a front wall (21), a rear wall (22) and a bottom wall (23).
And a rear surface (33) and a bottom surface (36) are received to fix the blade tip to the base metal, and the base of the blade tip abuts the front wall and the rear wall of the receiving recess. The front surface and the rear surface respectively have the surfaces (31) and (33), and one of the contact surfaces is formed so that the distance between the front and rear contact surfaces (31) and (33) becomes smaller toward the tip of the tip (3). The surface (31) is inclined with respect to the other contact surface (33), and the front wall (21) and the rear wall (22) of the receiving recess (2) contact the front and rear contact surfaces (31) of the tip (3). Inclining corresponding to (33), an insertion space (24) is formed between the bottom wall (23) of the receiving recess and the bottom surface (36) of the chip, and the pressing member (4 ) Is inserted, the front and rear abutment surfaces (31) (33) of the tip
In the fixing structure of the cutting edge tip to the base metal, which is pressed against the front and rear walls (21) (22) of the receiving recess, at least one of the front surface (31) and the rear surface (33) of the base of the cutting edge tip (3) A groove having a thickness substantially equal to the thickness of the base metal (1) is formed on one surface, and the bottom surface of the groove is the contact surface described above.
(31) and (33), the pressing member (4) has a single plate shape, and the plate-shaped pressing member
The bottom side of (4) is parallel to the bottom wall (23) of the receiving recess, and the top side of the plate-shaped pressing member is parallel to the bottom surface (36) of the base of the chip. Bottom wall of recess (23)
And the bottom surface (36) of the base of the chip are parallel to each other, and a recess (25) for introducing the pressing member is formed on the bottom wall (23) of the receiving recess. The length between the bottom surface (36) of the base of the pressing member (4) is larger than the length between the upper side and the bottom side of the pressing member (4), and the corner portion of the pressing member (4) is inserted into the introduction recess (25). Insert
The pressing member is inserted into the insertion space and the introduction recess
The space between the pressing member (4) including (25) and the receiving recess (2) is
A structure for fixing the cutting edge tip to the base metal, which is filled with an adhesive filler (S).