TW201334896A - Rotary reciprocating saw blade for a power tool - Google Patents

Abstract

A rotary reciprocating saw blade (1) for a power tool comprises a blade body (2) having a cutting edge (4), at least one embossed structure (12) being introduced into the side face of the blade body (2), said embossed structure delimiting a recess (15) in the blade body (2).

Description

Rotary oscillating saw blade for machine tools (2)

The invention relates to a rotary oscillating saw blade for a machine tool according to the citation of claim 1 of the patent application.

In EP 12 65 333 B1, a boring saw blade for a machine tool is used which oscillates in an oscillating manner during operation. The immersed saw blade has a nearly rectangular dry sheet (Stammblatt), one end of which is provided with a holding section for connecting with the tool shaft, and the other end of which has a cutting edge with cutting teeth, in the receiving section of the tool shaft A small portion of the intrusion (Einpägung) with the cutting edge is provided in the side of the dry sheet. The intrusion helps to reduce the Aufschwenk properties of the saw blade and improve the cutting accuracy. The intrusion has a depth of penetration relative to the mantle and can be designed as a rectangle, a circle or a triangle, wherein the non-circular geometry is oriented at an angle to the longitudinal axis of the blade. In general, most of the intrusion is made into this side.

The object of the invention is to design a immersed blade to be able to accurately machine the workpiece over a long period of operation by means of simple structural measures.

This purpose is achieved by using the features of item 1 of the scope of the patent application. Subsidiary items in the scope of application for patents are further features.

The invention relates to a rotary vibration saw blade in the form of a immersed saw blade, which is particularly Used in handheld machine tools. And the rotary vibration motion during operation. For example, the immersed saw blade has a circular segment or a rectangular shape that is at least nearly rectangular, the side edge of which is designed to have at least a nearly straight (also slightly curved) cutting edge with cutting teeth.

At least one of the plunging portions is formed in at least one side of the dry sheet, and the plunging portion is preferably designed in a line shape or a strip shape, and extends, for example, in the direction of the cutting edge. The intrusion changes the stress properties of the dry sheet, which has a positive effect on the natural frequency of the immersed blade and the propagation of the vibration wave. The natural frequency overlap of the dry sheet and the machine tool can be avoided, which reduces the vibration of the dry sheet in the region of the cutting edge with the cutting teeth. As a result, the vibration and noise are reduced as a whole, so in addition to the improvement in comfort, the processing quality is also improved. Because the saw blade is less loaded, the better work quality even in a long operating period. Can be maintained.

At least one hole (Aussparung) is made into the dry piece, which is highlighted by at least one of the intrusions. This void (for example, it can be produced by stamping) reduces the moment of inertia of the mass of the dry sheet. This (especially where the transmission of vibration is small) has a positive effect on the service life and on the health of the operator. In addition, a smaller drive motor can be designed using metrics. The intrusion in the dry sheet prevents stability reduction due to voids in the cavity. Therefore, by combining the cavity and the plunging portion, various advantages can be combined, that is, the mass or mass inertia moment is reduced, and the stability is better, and the vibration propagation situation is reduced.

Preferably, a plurality of voids are made into the dry sheet (the voids are each bounded by at least one of the indentations that are preferably linear or strip-shaped, a suitable practice, tied to at least two sides of a void (and such as It is necessary to provide an intrusion on all sides of the cavity to prevent a decrease in stability due to the cavity.

Consider making the cavity have a variety of different cross sections, especially angular (such as triangles) Shape or rectangle) geometry.

The intrusion can be produced by pressing (Prägen, English: emboss or stamp), in which case there can be an intrusion (in the form of a depression) on one side of the dry sheet. On the opposite side of the side, the rolling operation produces a corresponding ridge.

However, it is also possible to produce the plunging portion by rolling, in particular rolling on both sides of the dry sheet, so that the indented portion in the form of a recess is formed on both sides, and the material in the dry sheet is compressed in the region of the intrusion portion.

The penetration depth of the intrusion portion should be at least 0.1 mm, and the intrusion portion causes reinforcement in the dry sheet. Therefore, the stress property is changed, and if the intrusion portion is produced by rolling, the penetration depth is preferably at most 0.2 mm (e.g., 0.1 mm) and, if necessary, in the range of a few hundredths of a millimeter, for example, about 0.01 mm.

The strip-shaped intrusion portion of the strip form preferably extends in the longitudinal direction of the dry sheet so that it is orthogonal to the cutting edge. The intrusion portion can extend over most of the length of the dry sheet, thus ensuring that the intrusion portion causes material reinforcement in a corresponding distance of the dry sheet. The plunging portion may be directly adjacent to the cutting edge, but may be located at a greater distance from the edge of the cutting edge if necessary, or may be provided with an angled indentation, parallel to the cutting edge if necessary. It is also conceivable for the linear or strip-shaped intrusion to extend diagonally in the dry sheet. Wherein a corner of the cutting portion of the intrusion portion and an opposite end of the diagonal of the dry sheet extend. According to an advantageous embodiment, a plurality of linear or strip-shaped intrusions are formed into at least one side, the in-line intrusions being parallel or at an angle to each other. Intersect if necessary. If the two opposite sides of the dry sheet each have one or more rectilinear or strip-shaped intrusions, they are preferably mirror-symmetrical to each other on the left and right sides of the dry sheet.

Basically, it suffices to design the intrusion portion as a line having a small width. but It is also conceivable that the strip-shaped intrusion portion has a width of at most 3 mm, for example, in the case of using the intrusion portion, and in the case where the intrusion portion is generated by the pressing, it is also possible to be wide.

The linear strip-shaped stamping portion may extend in a straight line or in a curved shape.

The printing portion is preferably connected to a holding portion which can be designed in the form of a separate component and which is connected to the tool shaft via this component. The retaining portion can be designed to be flat or truncated, has a shaft receiving portion for connection to the tool shaft, and has a connecting portion for connection with the dry sheet, wherein the shaft receiving portion and the connecting portion are parallel to each other and They are located at different heights and are interconnected by an over-extended section that extends obliquely.

Other advantages and suitable embodiments are found in the scope of the patent application, the description of the drawings and the drawings.

(1)‧‧‧Into the saw blade

(2) ‧‧‧dry film

(3) ‧ ‧ ‧ Department

(4) ‧‧‧ cutting edge

(5) ‧‧‧ (fixed) housing

(6)‧‧‧Tool shaft

(7)‧‧‧Rotary axis

(8) ‧‧‧ snap opening

(9)‧‧‧Axis housing section

(10) ‧ ‧ transitional section

(11) ‧‧‧Connected sections

(12a)~(12f)‧‧‧Intrusion Department

(15a)~(15f)‧‧‧ hollow

Figure 1 is a rotary oscillating saw blade designed to be immersed in a saw blade in the form of a nearly rectangular dry sheet. The leading edge is formed in the form of a cutting edge having cutting teeth, having a retaining portion for attachment to a tool shaft and a plurality of intrusions on the dry sheet defining the boundaries of the void therebetween.

Figure 2 is an embodiment similar to Figure 1, but with the voids and the geometry of the intrusions defining them.

Figure 3 is a cross-sectional view of a dry sheet that has not been inserted into the saw blade.

In the drawings, the same components are denoted by the same reference numerals.

The immersed saw blade (1) shown in Figure 1 is used for manual operation with a rotary vibration drive. The machine comprises at least one dry sheet (2) of a nearly rectangular or circular segment shape, and a truncated retaining portion (3) [the holding portion (3) and the dry sheet are connected]. The cutting edge (4) with cutting teeth is provided on the free end side of the holding piece (3) on the back side of the dry sheet (2). The holding portion (3) comprises a shaft receiving portion (9) having a fixed receiving portion (5) for receiving a tool shaft (6) of the machine tool, the tool shaft is oscillating about the rotating shaft (7) The action with the tool shaft (6) is effected by means of snap-fit openings (8) which engage in a ring-shaped centrally fixed recess (5) into the shaft receiving section (9).

Furthermore, the holding portion (3) comprises a transition portion (10) and a connecting portion (11) connected to the dry sheet (2) via the connecting portion (11); the dry sheet (2) and the holding portion (3) ) Designed as separate components, but the two are firmly connected to each other. The shaft receiving section (9) and the connecting section (11) are staggered parallel to one another, the height difference being spanned by a diagonally extending transition section (10). The shaft receiving section (9), the transition section (10) and the connecting section (11) are designed in one piece.

In addition, as shown in FIG. 1, the dry sheet (2) immersed in a saw blade (1) has a plurality of voids (15a) to (15f) which completely penetrate the dry sheet and are orthogonal to the plane of the dry sheet, but Substantially cavities can also be in the form of depressions in the dry sheet (2) which do not extend completely through the dry sheet. In this case, the depressions may be provided only on one side of the dry sheet (2) or on both sides thereof, each in a mirror symmetrical or asymmetrical manner.

Due to the holes (15a) to (15f), the mass and mass inertia moment (moment of inertia) of the dry film and the immersed blade are reduced. In order to at least partially strengthen the strength caused by the cavity, the intrusion is made. (12a)~(12d) are made into the dry film, they should be set only on one side of the dry piece, and the intrusion part (12a)~(12d) can be done on the side to make the hole (15a)~( Several sides of the 15f) (preferably all of its sides) are surrounded by the intrusion. The action of the intrusion section increases the strength.

The intrusion should be generated by rolling (Prägen, English: emboss or stamp); here In this case, only the intrusion portion is provided on one side of the dry sheet, in the form of a recess of at least 0.1 mm, and the side effect of the rolling on the opposite side causes a corresponding raised portion. The intrusion can also be produced by rolling, such that a mirror-symmetrical intrusion is produced on the two opposite sides of the dry sheet, as a result of which the dry sheet material is compressed, thus creating an intrusion (12) with no material from the stem. The piece is removed.

Two intrusion portions (12a) (12b) extending parallel to each other are formed in the side of the dry sheet (2), which are designed in a straight line and strip shape and extend the longitudinal aspect of the sheet (2) - at least approximately The cutting edge (4) is orthogonal-extended.

The two insertion portions (12a) (12b) extend all the way to the front of the cutting edge (4), they are a small distance from the cutting edge (4), and the cutting edge (4) can extend in the opposite direction. Go to the connecting section (11) on the holding part.

According to Fig. 1, the dry sheet is designed to be at least nearly rectangular, and a total of six holes (15a)~(15f) are made into the dry sheet, and at least two sides are surrounded by the intrusion portion (12a) (12b), and there are two The intrusion portion (12a) (12b) is formed to be curved along a diagonal line. Further, a linear intrusion portion (12c) extends in the center along the cutting edge (4), and has a plunging portion (12b) adjacent to and parallel to the cutting edge (4), and the cavity (15a)~(15f) Each is designed in a triangle.

In the embodiment according to FIG. 2, six hollow holes (15a) to (15f) are also made in the dry sheet (2). In order to save weight, the cross section of the dry sheet (2) is one-in-one (einschnüren) The section has a width which is smaller than the area of the cutting edge (4) and the connection area of the connecting section (11) on the holding portion (3). A total of four intrusion portions (12a) to (12d) are provided, one of which has a longitudinally extending intrusion portion (12a) extending in the center, and three intrusion portions (12a) (12b) extending orthogonally thereto ( 12c) is set parallel to the cutting edge (4). The intrusion portions (15a) to (15f) are each designed to be nearly quadrangular and each of the two sides is surrounded by the intrusion portion.

As can be seen from the cross-sectional view of the dried sheet (2) in Fig. 3, the intrusion portions (12a) (12b) (12c) which are made by rolling are in the form of depressions on one side of the dry sheet, and vice versa. A corresponding ridge (16a) (16b) (16c) is created on the side, and the recess or ridge is surrounded by a cavity (15a (15b)) therebetween.

(1)‧‧‧Into the saw blade

(2) ‧‧‧dry film

(3) ‧ ‧ ‧ Department

(4) ‧‧‧ cutting edge

(5) ‧‧‧ (fixed) housing

(8) ‧‧‧ snap opening

(9)‧‧‧Axis housing section

(10) ‧ ‧ transitional section

(11) ‧‧‧Connected sections

(12a)~(12f)‧‧‧Intrusion Department

(15a)~(15f)‧‧‧ hollow

Claims (12)

A rotary oscillating saw blade for a machine tool, in particular for a hand tool machine, having a dry sheet (2) having at least a linear edge (4), at least one of which has a plunging portion (12) It is disposed in a side of the dry sheet (2) and is characterized in that at least one cavity (15) is provided in the dry sheet (2). The void is bounded by at least one intrusion (12). For example, the rotary oscillating saw blade of claim 1 wherein: a plurality of holes (5) are formed into the immersed saw blade (2), wherein at least two holes (15) are replaced by one or several plunging portions (12). )separate. A rotary oscillating saw blade according to claim 1 or 2, wherein the cavity (15) passes completely through the dry sheet (2) perpendicular to the plane of the saw blade of the dry sheet (2). For example, the rotary oscillating saw blade of claim 1 or 2, wherein all sides of the cavity (15) are surrounded by the plunging portion (12). A rotary oscillating saw blade according to claim 1 or 2, wherein the plunging portion (12) is designed in a line shape or a strip shape. A rotary oscillating saw blade according to claim 1 or 2, wherein a linear or strip-shaped intrusion portion (12) is formed in both sides of the dry sheet (2). A rotary oscillating saw blade according to claim 1 or 2, wherein the two sides of the dry sheet (2) are directly opposed to each other. A rotary oscillating saw blade according to claim 1 or 2, wherein the at least one plunging portion (12) is pressed into the side surface of the dry sheet (2) by rolling. For example, the rotary oscillating saw blade of claim 1 or 2, wherein: At least two of the intrusion portions (12) are formed in one side. A rotary oscillating saw blade according to claim 1 or 2, wherein the plunging portion (12) has a depth of at least 0.1 mm. A rotary oscillating saw blade according to claim 1 or 2, wherein the plunging portion (12) has a width of at least 3 mm. A machine tool, in particular a hand tool machine, having a rotary oscillating saw blade (1) according to any one of claims 1 to 11.