DE29619357U1 - Micro perforation wheel - Google Patents

Description

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Applicant:

Schober GmbH

Tool and machine construction

Industriestr. 2/8

7173 5 Eberdingen

3962 080 S/mr 04.11.19196

WP96/13

Title: Microperforation wheel

DESCRIPTION

The invention relates to a micro-perforation wheel with a disk-shaped cutting carrier, which can be connected to a drive in particular via a central bore, and a cutting edge provided on the cutting carrier, which is formed by a large number of individual cutting edges, and the cutting edges have cutting flanks on both sides at an angle to the axis of rotation, which form a cutting body with a triangular cross section, the base of which merges into the cutting carrier, wherein the individual cutting edges are separated from one another by radial incisions.

Such a perforation wheel is known, for example, from WO 9615884. This micro-perforation wheel has a

The cutter holder has a large number of individual cutting edges on its circumference. These cutting edges are separated from one another by incisions in the circumferential direction. The base of the incisions runs parallel to one of the cutting flanks, so that the cutting bodies are completely separated from one another on one cutting flank and are still partially attached to one another on the other cutting flank. The disadvantage here is that this micro-perforation wheel can only be sharpened by re-grinding the connected cutting flanks, i.e. a grinding process can only be carried out on one side. However, this changes the position of the cutting edge in relation to the cutter holder. The cutting edge moves out of the center plane of the micro-perforation wheel in the axial direction with each grinding process. If a micro-perforation wheel that has been reground in this way is reinstalled, it must be axially adjusted again because due to the newly positioned cutting edge, the cutting line does not match the old cutting line of the micro-perforation wheel before the grinding process.

The invention is based on the object of developing a micro-perforation wheel of the type mentioned at the beginning in such a way that it can be resharpened several times and can be resharpened from more than one side.

This object is achieved according to the invention in that the height of the incisions corresponds to at least 50% of the height of the cutting bodies.

Because the height of the cuts on both sides of the cutting body, i.e. on both cutting flanks, corresponds to at least 50% of the height of the cutting body, both cutting flanks can be reground when sharpening the micro-perforation wheel, so that the axial position of the cutting edge in relation to the cutting edge carrier is maintained. In this way, the stops on the machine do not have to be readjusted when reinstalling the micro-perforation wheel, as it can be reground in such a way that, compared to the micro-perforation wheel before the re-grinding process, the cutting lines are equally positioned. The height of the cuts is 0.5 to 4 mm, in particular 2 to 3 mm, and preferably 2.5 mm.

In a preferred embodiment, the cut extends to the base of the cutting body. In this way, the cutting body can be used over its entire height. Such micro-perforation wheels can be resharpened at least twenty times, depending on the degree of wear.

It has been shown that the incision can also extend into the blade carrier. This is particularly the case with micro-perforation wheels with a large diameter.

Variant is conceivable, since even with deep cuts the length of the cutting edges changes only insignificantly during the individual grinding processes, i.e. only decreases slightly.

Preferably, the base of the cut runs parallel to the axis of rotation. This has the significant advantage that both cutting edges have the same regrinding potential and thus an unchanged position of the cutting edge can be guaranteed over the entire service life of the micro-perforation wheel.

In a preferred embodiment, the side surfaces of the cutting carrier merge directly into the cutting flanks at the base of the cutting body. This preferred design of the micro-perforation wheel allows the cutting flanks to be reground until the cutting edge reaches the base of the cutting body, i.e. the cutting body is almost

are completely ground down. This assumes, of course, that the cuts extend to the base or slightly beyond.

In a preferred embodiment, the incisions are made by wire erosion (spark erosion). Since the base of each incision extends parallel to the axis of rotation * , the incisions of several incisions arranged one above the other can be made in one operation.

Micro-perforation wheels are manufactured. This also has the advantage that the cuts on all micro-perforation wheels processed at the same time have the same dimensions.

Further advantages, features and details of the invention emerge from the subclaims and the following description, in which a particularly preferred embodiment is described in detail with reference to the drawing. The features shown in the drawing and mentioned in the claims and in the description can each be essential to the invention individually or in any combination. In the drawing:

Figure 1 is a partial longitudinal section of an embodiment of a micro-perforation wheel; and

Figure 2 shows a segment of the wheel according to Figure 1.

The micro-perforation wheel 1 shown in the figures consists essentially of a blade carrier 2 and a plurality of cutting bodies 3, which can be made of the same material as the blade carrier 2. However, it is also conceivable that the cutting bodies 3 are made of a different material and are soldered, welded or pressed onto the circumference of the blade carrier 2.

or are attached in another way. The micro-perforation wheel 1 is, for example, mounted on a shaft (not shown) so that it can rotate about a rotation axis 4. Cutting edges 5 of the individual cutting bodies 3 roll on the material to be processed. On both sides of each cutting edge 5 there are cutting flanks 6 and 7 which extend to the circumference of the cutter holder 2. The cutting flanks 6 and 7 are at an angle to the rotation axis 4, with the two angles of inclination being the same. The cutting body 3, which is triangular in cross section, has a base 8 via which it is connected to the cutter holder 2. The cutting edge 5 is spaced from the base 8, with this distance being referred to as height 9 below.

The individual cutting bodies 3 are separated from one another by incisions 10, which are clearly visible in Figure 2. The depth of these incisions 10 corresponds to the height 9 defined above. In the exemplary embodiment shown, these incisions 10 extend to the base 8. In addition, the base 8 and thus the bottom of the incisions 10 extend parallel to the axis of rotation 4. In this way, worn micro-perforation wheels 1 can be resharpened on both cutting flanks 6 and 7, so that the position of the cutting edge 5 with respect to the center plane 11 of the micro-perforation wheel 1 is maintained. Readjustment of the machine stops for the resharpened micro-perforation wheel 1 is therefore unnecessary.

However, grinding machines can also be used with this device in which such micro-perforation wheels are only regrinded on one side, i.e. only one of the cutting flanks 6 or 7 is machined. In this case, for example, the cutting flank 6 can be machined during one regrinding process and, when the micro-perforation wheel is worn again and the subsequent further regrinding process is carried out, the cutting flank 7 can be machined, so that the cutting edge 5 is then again located centrally in the center plane 11.

Claims (8)

EXPECTATIONS 1. Micro-perforation wheel with a disk-shaped cutter carrier (2), which can be connected to a drive in particular via a central bore, and a cutting edge provided on the cutter carrier (2), which is formed by a plurality of individual cutting edges (5), and the cutting edges (5) have cutting flanks (6 and 7) on both sides at an angle to the axis of rotation (4), which form a cutting body (3) with a triangular cross section, the base (8) of which merges into the cutter carrier (2), the individual cutting edges (5) being separated from one another by radial incisions (10), characterized in that the height (9) of the incisions (10) corresponds to at least 50% of the height of the cutting bodies (3). 2. Micro-perforation wheel according to claim 1, characterized in that the incision (10) extends to the base (8) of the cutting body (3). 3. Micro-perforation wheel according to one of the preceding claims, characterized in that the incision (10) extends into the blade carrier (2) 4. Micro-perforation wheel according to one of the preceding claims, characterized in that the bottom of the incision (10) and/or the base (8) runs parallel to the axis of rotation (4). 5. Micro-perforation wheel according to one of the preceding claims, characterized in that it can be regrinded more than twice on one cutting flank (6 or 7) or on both cutting flanks (6 and 7). 6. Micro-perforation wheel according to claim 5, characterized in that it can be resharpened at least twenty times. 7. Micro-perforation wheel according to one of the preceding claims, characterized in that the side surfaces of the cutting carrier (2) merge directly into the cutting flanks (6 and 7) at the base (8) of the cutting bodies (3). 8. Microperforation wheel according to one of the preceding claims, characterized in that the incisions (10) are wire eroded.