A kind of method for coiling of valute spring
Technical field
The present invention relates to a kind of production method of spring, particularly the preparation method of valute spring.
Background technology
In the prior art, a kind of valute spring is arranged, this spring can bear bigger load, can absorb bigger deformation energy, and its compact conformation is mainly used in heavy-duty machinery, makes it play good cushioning effect in the space of size-constrained system.The rolling technology more complicated of this spring, need on large-scale lathe, produce a pair of turriform mandrel, the strip plate that cuts in advance is fixed on the turriform mandrel, in Large-scale Heater, grills thoroughly again and roll, heat-treat again after the moulding and can obtain product; Its weak point is: the rolling technology more complicated of this spring, the layer and the gap between the layer of spring are difficult to handle, and often cause the inaccurate problem of spacing.
Summary of the invention
The method for coiling that the purpose of this invention is to provide a kind of valute spring makes it easy to manufacture, and the gap between layer and the layer is even.
For achieving the above object, the invention provides a kind of method for coiling of valute spring, in turn include the following steps:
One end of the strip plate that A) will cut in advance inserts the opening part of the axle head setting of a cylindrical mandrel, and make between plate and the mandrel in an acute angle, fix a pin on and the position that keeps at a certain distance away parallel with mandrel, the distance between mandrel axis and the pin is not less than the radius of the scroll spring behind the type of being rolled into;
B) rotation mandrel abuts on the pin plate, gives the heating of the plate between mandrel and the pin, and the mandrel of constantly reeling, and when reeling, compressed asbestos sheet abutted on the plate is wound on the mandrel in the lump;
C) roll finish after, the workpiece of moulding is heat-treated together with compressed asbestos sheet;
D) after the heat treatment cooling,, with drill rod compressed asbestos sheet is removed from workpiece again with the water-soaked compressed asbestos sheet.
The present invention utilizes compressed asbestos sheet to roll, and compressed asbestos sheet is at high temperature not oxidized, and the layer of scroll spring and the gap between the layer are remained evenly, finishes until heat treatment; In addition, cylindrical mandrel replaces turriform mandrel of the prior art, has reduced manufacture difficulty, has saved manufacturing cost; Make valute spring according to the present invention, roll conveniently, gapping of spring is even, and load-carrying properties are good.
Description of drawings
Fig. 1 is the schematic diagram that rolls of valute spring;
Fig. 2 is the front view of mandrel;
The A-A of Fig. 3 Fig. 2 is to view;
Fig. 4 is for removing the preceding valute spring structural representation of compressed asbestos sheet;
The specific embodiment
The method for coiling of valute spring, following steps are carried out successively:
One end of the strip plate that A) will cut in advance inserts opening 3 places of the axle head setting of a cylindrical mandrel 2, and make between plate 5 and the mandrel 2 in an acute angle, fix a pin 4 on and the position that keeps at a certain distance away parallel with mandrel 2, the distance between mandrel 2 axis and the pin 4 is not less than the radius of the scroll spring behind the type of being rolled into;
B) rotation mandrel 2 abuts on the pin 4 plate 5, gives the heating of the plate between mandrel and the pin, and the mandrel 4 of constantly reeling, and when reeling, compressed asbestos sheet 1 abutted on the plate is wound on the mandrel in the lump; The purpose of heating is to make the metal blank deliquescing, is convenient to bending.
C) roll finish after, the workpiece of moulding is heat-treated together with compressed asbestos sheet 1; The heat treatment mode of its heat treatment mode during with manufacturing valute spring of the prior art is identical.
D) after the heat treatment cooling,, with drill rod compressed asbestos sheet is removed from workpiece again with the water-soaked compressed asbestos sheet.