DE102020122801B3 - Guillotine cutter unit for machine tools and machine tools equipped with them - Google Patents

Abstract

The guillotine cutter unit for machine tools is characterized in that the guillotine cutter unit comprises a basic knife body (1, 2, 3) and an exchangeable cutting unit (4) which can be inserted therein and fastened to the basic knife body (1, 2, 3) Figure 2 proposed.

Description

The invention relates to a guillotine cutter unit for machine tools and a machine tool equipped therewith according to the preamble of claim 1.

background

The invention relates in particular to a guillotine cutter unit for processing glass wool and rock wool.

State of the art

For the cross-cutting of endlessly manufactured material webs, guillotine shear knives made of hardened all-steel knives are usually used. Knife lengths of 0.5 m to 4 m at a height of 200 to 500 mm and a thickness of 2 to 10 mm are used here. These knives have weights of a few kg up to 50 kg per knife, which leads to a considerable risk of accidents when changing these knives.

In addition, the downtime depends on the ambient conditions. For example, it may be necessary to use a crane to lift out the entire guillotine shears in order to change the knife.

The aim was therefore to minimize the risk of accidents and to change the cutting edges without great effort.

• Die eingesetzten Messer sind zum Querteilen von endlosen Glaswolle-Strängen (Steinwolle-Strängen) vorgesehen. Die Messer wurden bisher immer aus gehärteten Werkzeugstählen mit einer gegenläufigen Schnittverzahnung, die jeweils von der Mitte des Messers nach außen verläuft, hergestellt.

The current state of the art for guillotine shear blades for glass wool and rock wool processing is as follows:

• The knives used are intended for cross-cutting endless glass wool strands (rock wool strands). Up to now, the knives have always been made of hardened tool steels with counter-rotating cutting teeth, which each run from the center of the knife to the outside.

The change cycles for these knives, due to the high level of wear and tear, are between a week and a month. There have already been many attempts to increase the service life by coating the cutting edges. However, this only ever affected the entire knife and had only moderate success, which was not in relation to the costs.

After a knife with soldered-on hard metal cutting edges was established on the market, the service life has improved considerably (1 year and more). However, these knives are very sensitive to impact or partial forces acting on the hard metal cutting edge, which led to the fact that some cutting edges broke off when these knives were installed and the entire knife was no longer usable.

From the KR 10 2020 0 067 544 A A guillotine cutter unit for machine tools is known which comprises a knife base body and an exchangeable cutting unit which can be inserted therein and fastened to the knife base body. A machine tool with such a guillotine cutter unit is also from the KR 10 2020 0 067 544 A known.

From the DE 37 41 162 A1 A guillotine cutter unit for machine tools is known which comprises a knife base body and a cutting unit which can be inserted therein and fastened to the knife base body. The individual cutting units are attached to the basic knife body by means of a screw connection.

Neither that KR 10 2020 0 067 544 A nor the DE 37 41 162 A1 disclose guide slots in the knife body, in which the pull tabs of the cutting units lie.

Problem and solution of the invention

Object of the invention: The above-mentioned disadvantages of the prior art are to be avoided.

This object is achieved by the features of claim 1.

Advantages of the invention

The problem of tooth stability with these relatively thin knives could previously only be solved by materially inseparable connections, which has now been achieved through the support surfaces in conjunction with a pull tab as a replaceable unit for single-tooth design with the same functionality.

The problem of tooth or cutting edge stability is opposed to the changeable tooth knife, since normally the support of the cutting forces is transferred over a large area to a correspondingly stable base body (e.g. turning chisel). However, since the cutting edges of knives are usually made very narrow and high leverage forces heavily load the cutting edge laterally, the novelty relates to the constructive solution by means of support surfaces in two directions (enlargement of the support surfaces by V-formation) and the pull tab. Through these two elements, the cutting forces are safely transferred into the base body and a stable guillotine cutter with a long service life is produced.

When changing the tooth unit 4th the effort and the risk of accidents are then reduced to a minimum.

With the invention it is achieved that the actual cutting edge is changed separately from the basic knife body. This enables partial repairs to the knife. This saves a complete knife change.

After the basic body has been installed in the guillotine unit, the alternating teeth row can be used with a minimized risk of accidents and the guillotine can start operating again.

Due to the possibility of changing individual teeth, a mix of materials is also possible that allows highly wear-resistant materials to be used as cutting edges and thus to achieve a considerable increase in service life, such as the use of hard metal or cutting ceramics as cutting edges.

This alternating tooth technology can be used on very thin cutting geometries

The materials of the cutting edges can be adapted to the material to be cut, which results in a long service life.

The fact that only the tooth units have to be transported reduces the transport effort, which ensures that the knife is repaired in an environmentally friendly manner.

In the invention it is particularly important that the cutting unit 4th can be changed individually, thereby improving handling, accident potential, selection of the cutting material and logistics.

Another advantage is the drastic reduction in carbon footprints through longer use of the flyknife.

In developing the system according to the invention, the inventor overcame the following technical difficulties in an unobvious way.

In the first versions, several teeth were combined as a block on a section of the knife and with a fastening strap between the two metal sheets 1 and 2 tense. The support effect was only realized parallel to the main body in one plane and too far from the cutting tip. Due to the long lever lengths, the cutting forces were so high that these tooth blocks kinked, making the entire knife system unusable.

With the screwed version, strips with a thread were initially provided. Hexagon socket screws DIN 912 were used with protective strips (wear protection) on the cover plates 1 and 2 were attached. However, these strips were not accepted by the customers because they would have pulled the material upwards and the knife would have become too thick in places.

When producing the tooth unit, no guide slots were initially provided for connecting to the pull tab, which represented too small a fastening surface between the cutting edge and pull tab, as a result of which the cutting edges were not adequately secured and broke off.

Advantageous refinements of the invention are given in the subclaims.

• - dass Stützflächen (7, 8) in Verbindung mit der Zuglasche (4.2) als wechselbare Einheit zur Einzelzahnausführung vorgesehen sind,
• - dass die Stützflächen (7, 8) V-förmig ausgebildet sind,
• - dass Führungsschlitze zum Verbinden mit der Zuglasche (4.2) vorgesehen sind,
• - dass der Messergrundkörper (1, 2, 3) als Stützflächen zwei Deckbleche (1, 2) und ein zwischen diesen angeordnetes Distanzblech (3) aufweist, dass die Führungsschlitze vom Distanzblech (3) gebildet wird und die Zuglasche (4.2) zwischen den Deckblechen (1, 2) angeordnet und an diesen auswechselbar befestigt ist,
• - dass die Zähne aus unterschiedlichem Material bestehen.

So it is proposed

• - that support surfaces ( 7th , 8th ) in connection with the pull tab ( 4.2 ) are intended as an exchangeable unit for single tooth design,
• - that the support surfaces ( 7th , 8th ) Are V-shaped,
• - that guide slots for connecting with the pull tab ( 4.2 ) are provided,
• - that the knife body ( 1 , 2 , 3 ) two cover plates ( 1 , 2 ) and a spacer plate arranged between them ( 3 ) that the guide slots from the spacer plate ( 3 ) is formed and the pull tab ( 4.2 ) between the cover sheets ( 1 , 2 ) is arranged and attached to it in an exchangeable manner,
• - that the teeth are made of different materials.

Embodiment

An exemplary embodiment of the invention is described in more detail below with reference to drawings. In all drawings, the same reference symbols have the same meaning and are therefore only explained once if necessary.

• 1: das Wechselzahnmesser gemäß der Erfindung,
• 2: als Detail einen Ausschnitt nach 1 mit fehlenden Zahn zur Verdeutlichung der Stützflächen,
• 3: als Detail einen Ausbruch nach 2 zur Verdeutlichung der Befestigung der Zahneinheit 4,
• 4: eine Seitenansicht nach 1,
• 5: eine Seitenteilansicht nach 4 zur Verdeutlichung der Befestigung mittels Schrauben / Muttern oder Nietbefestigung,
• 6: eine Zahneinheit 4 nach 1 und
• 7: Stützflächen nach 6.

Show it

• 1 : the interchangeable tooth knife according to the invention,
• 2 : as a detail after a section 1 with missing tooth to clarify the supporting surfaces,
• 3 : as a detail after an outbreak 2 to clarify the attachment of the tooth unit 4th ,
• 4th : a side view after 1 ,
• 5 : a partial side view after 4th to clarify the fastening by means of screws / nuts or rivet fastening,
• 6th : a unit of teeth 4th after 1 and
• 7th : Support surfaces after 6th .

Structure of the guillotine cutter unit for machine tools

In 1 is according to the invention a guillotine cutter with alternating tooth units 4th shown.

2 : The alternating tooth units 4th are between the support side cover sheet 1 , a spacer plate 3 and a pull-side cover plate 2 screwed or riveted (5).

The support surfaces 7th absorb the cutting loads on the cutting edge. This alternating tooth knife is in layers through the support side cover sheet 1 , the spacer plate 3 and the train side cover plate 2 which are inseparably connected to each other (e.g. by gluing / welding).

3 : By screwing or riveting 5 , becomes the pull tab of the interchangeable tooth unit 4th to the support side cover plate 1 braced and thus secured against falling out. The support surfaces 7th absorb the cutting forces that act on the alternating tooth unit and transfer them to the support side cover plate and the tension side cover plate.

4th shows the side view of the guillotine cutter with the arrangement of the support side cover plate 1 , the spacer plate 3 , the train side cover plate 2 , and the alternating tooth unit 4th .

5 : In the detailed side view, the bracing of the alternating tooth unit 4th by means of the screw head or rivet head 5 , the support side cover plate 1 and the nut or the rivet foot 6th shown. The tension side cover plate serves as a guide for the nut or rivet foot.

6th shows the alternating tooth unit 4th , consisting of the cutting edge 4.1 and the pull tab 4.2 with two mounting holes 9 . These two parts are inextricably linked (e.g. by gluing / welding / soldering).

The one in the 7th shown support surfaces of the cutting edge 8th are based on the support surfaces 7th the end 3 from, whereby the cutting forces are directed into the cover plates.

How the guillotine cutter unit works

• Schritt 1: Nachdem das Schlagscherenmesser (1) in die Schlagschere eingebaut wurde, ist es betriebsbereit zum Trennen von langen Bahnen trennbaren Materials (Mineralwolle oder ähnlich).
• Schritt 2: Sind nach einer entsprechenden Betriebszeit die Schneiden verschlissen, kann die Wechselzahneinheit 4 (5), nun durch Entfernen der Verbindungselemente (5: Schraubenkopf / Nietkopf 5, und Mutter / Nietfuß 6) herausgezogen und durch eine neue oder nachgeschärfte Wechselzahneinheit 4 (5), ersetzt werden.

The mode of operation of the guillotine cutter unit according to the invention is explained in detail below:

• step 1 : After the scissors knife ( 1 ) has been installed in the guillotine, it is ready for use to cut long strips of separable material (mineral wool or similar).
• step 2 : If the cutting edges are worn out after a certain period of operation, the interchangeable tooth unit 4th ( 5 ), now by removing the connecting elements ( 5 : Screw head / rivet head 5 , and nut / rivet foot 6th ) and replaced by a new or sharpened alternate tooth unit 4th ( 5 ), be replaced.

List of reference symbols

1

Support side cover sheet

2

Train side cover plate

3

Spacer plate

4th

Cutting unit

4.1

Cutting edge

4.2

Pull tab

5

Screw / rivet head

6th

Nut / rivet foot

7th

Support surface of the cover plate

8th

Support surface of the cutting edge

9

Fixing holes in the pull tab

Claims (7)

Guillotine cutter unit for machine tools, wherein the guillotine cutter unit comprises a basic knife body (1, 2, 3) and an exchangeable cutting unit (4) which can be inserted therein and fastened to the basic knife body (1, 2, 3), characterized in that the cutting unit (4) has teeth has that the teeth of the cutting unit (4) are individually and interchangeably attached to the knife body (1, 2, 3), that the teeth have a cutting edge (4.1.) on the head and a pull tab (4.2) on the foot, that the pull tab ( 4.2) rests in guide slots in the knife body (1, 2, 3). Guillotine knife unit after Claim 1 , characterized in that support surfaces (7, 8) are provided in connection with the pull tab (4.2) as an exchangeable unit for single-tooth design. Guillotine knife unit after Claim 2 , characterized in that the support surfaces (7, 8) are V-shaped. Guillotine knife unit after Claim 1 , characterized in that guide slots are provided for connecting to the pull tab (4.2). Guillotine knife unit after Claim 2 , characterized in that the knife base body (1, 2, 3) has two cover plates (1, 2) as supporting surfaces and a spacer plate (3) arranged between these, that the guide slots are formed by the spacer plate (3) and the pull tab (4.2) is arranged between the cover plates (1, 2) and attached to them in an exchangeable manner. Guillotine knife unit after Claim 1 , characterized in that the teeth are made of different materials. Machine tool with a guillotine cutter unit according to Claim 1 .

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