DEP0007800DA - Steel and heat treatment for fingers for cutting units of sewing machines - Google Patents
Steel and heat treatment for fingers for cutting units of sewing machinesInfo
- Publication number
- DEP0007800DA DEP0007800DA DEP0007800DA DE P0007800D A DEP0007800D A DE P0007800DA DE P0007800D A DEP0007800D A DE P0007800DA
- Authority
- DE
- Germany
- Prior art keywords
- fingers
- steel
- heat treatment
- sewing machines
- cutting units
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000005520 cutting process Methods 0.000 title claims description 10
- 229910000831 Steel Inorganic materials 0.000 title claims description 9
- 239000010959 steel Substances 0.000 title claims description 9
- 238000010438 heat treatment Methods 0.000 title description 2
- 238000009958 sewing Methods 0.000 title description 2
- 238000010791 quenching Methods 0.000 claims description 3
- 230000000171 quenching effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Description
Bei Schneidwerken von Nähmaschinen bilden die Finger die Führungen des Mähmessers und gleichzeitig die feststehenden Gegenmesser.In the cutting units of sewing machines, the fingers form the guides of the mower knife and, at the same time, the fixed counter knife.
Man unterscheidet dabei in Bezug auf die Herstellung der Schneide, Ganzstahlfinger und Finger mit eingelegten Stahlplatten.A distinction is made with regard to the manufacture of the cutting edge, all-steel fingers and fingers with inlaid steel plates.
Die bisherigen Ganzstahlfinger sind im Einsatz gehärtet und haben daher eine geringe Härtetiefe und dadurch eine kurze Lebensdauer der Schneide.The previous all-steel fingers are hardened in use and therefore have a low hardening depth and thus a short service life of the cutting edge.
Die Finger mit eingelegter Stahlschneide vermeiden diesen Überstand, kommen aber in der Herstellung teuerer und durch das Einlegen der Stahlplatten wird der Finger geschwächt.The fingers with an inserted steel cutting edge avoid this protrusion, but are more expensive to manufacture and inserting the steel plates weakens the finger.
Beide Ausführungen haben den Nachteil, dass nur Material geringerer Festigkeit verwendet wird, und das Werkstück gegen Biegungsbeanspruchungen nur wenig widerstandsfähig ist.Both designs have the disadvantage that only material of lower strength is used and the workpiece is only slightly resistant to bending stresses.
Finger gemäss der Erfindung sind Ganzstahlfinger aus einem Stahl, mit dem man lediglich durch Abschrecken die notwendige Härte von etwa 500 - 600 Brinell erreicht. Ein C-Stahl mit 0,40 - 0,45 % C erfüllt diese Anforderungen in der Regel. Die ungehärteten Teile des Finger selbst haben dabei eine Zugfestigkeit von etwa 60 - 70 kg/mm(exp)2.Fingers according to the invention are all-steel fingers made of a steel with which the necessary hardness of about 500-600 Brinell can be achieved simply by quenching. A carbon steel with 0.40 - 0.45% C usually fulfills these requirements. The unhardened parts of the finger itself have a tensile strength of around 60 - 70 kg / mm (exp) 2.
Die Schneide ist gemäss der Erfindung im Aufsatzhärteverfahren durch Erhitzen mit einem Reihen- oder Schlitzbrenner und Abschrecken mit einer Brause oder in einem Bad auf die notwendige Härte gebracht.According to the invention, the cutting edge is brought to the necessary hardness in the attachment hardening process by heating with a series or slot burner and quenching with a shower or in a bath.
Der Finger ist dabei zweckmässig so geformt, dass die Scheidekante a gemäss den Abbildungen 1 und 2 aus dem Hauptkörper vorsteht und dadurch schnell und gründlich durchwärmt werden kann und durchhärtet.The finger is expediently shaped in such a way that the cutting edge a protrudes from the main body according to Figures 1 and 2 and can thus be warmed through quickly and thoroughly and hardened through.
Claims (2)
Family
ID=
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