You will need
- the spring wire of suitable diameter;
- gas torch cutting of metal;
- – locksmith tool;
- – heat or domestic oven.
Choose a material for the manufacture of springs. In production to do this, use special carbon and alloy steels or non-ferrous alloys – 65G, 60ХФА, 60S2A, 70СЗА, Br. B2, etc. With self-manufacturing products most appropriate material is another spring with a suitable wire diameter.
If the diameter does not exceed 1.5-2 mm, the spring can navit without heat treatment. To do this, straighten the wire so that it became completely flat, and wrap it on the mandrel.
The mandrel diameter should be smaller than the nominal inner diameter of the springs to compensate for the elastic deformation. May have to try several mandrels of different diameters to experiment to find the right size. The distance between the turns of the compression spring should be slightly larger than the finished product, and two outer coil should fit snugly to each other.
In that case, if the diameter of the wire of the original spring exceeds 2-2. 5 mm, before starting work, it should be annealed. Without this it is impossible to efficiently straighten and navit wire on the mandrel.
Annealing is best to use a special heat oven. If not, use a wood brick or metal. Melt the oven birch wood and put the spring into the resulting coals. Make sure that it became red-hot and leave to cool with the oven. After annealing wire become soft.
Straighten annealed the blank and wrap it in a frame, observing the same rules as in step 3. In the manufacture of a tension spring coils navigate close to each other.
Temper the spring. To do this, heat it to a temperature of 830-870°C and lower the spindle or transformer oil. Temperature control visually using the following information on the color of the heated metal. At the temperature of 800-830°C, the metal has a bright cherry red color at a temperature of 830-900°C – light red at a temperature of 900-1050°C – orange.
After hardening, compress the spring compression before complete closure of the coils and leave in this position for 20-40 hours. This operation will reduce the distance between the turns and bring it to nominal. Grind on grinding machine the ends of the spring for the flatness of its end faces.
When tempering for hot springs, you can use a gas burner. The latter can be used for heating during annealing, but in this case it is necessary somehow to provide the slow cooling of the product – at a rate of approximately 50-100°C/h.
Advice 2: How to change the springs in the couch
Repair furniture at home is a difficult task, but doable. On the one hand, specialist furniture is guaranteed to fix a broken sofa. But on the other hand, the overall delivery of the furniture to the repair shop - a very troublesome and expensive task. With a strong desire to repair the sofa at home on their own.
You will need
- - wrench;
- - flat screwdriver;
- - pliers;
- - a knife for the foam;
- - new foam.
Before you begin to repair, prepare the necessary space. To repair happened quickly and efficiently, prepare all the necessary tools and a set of new springs to replace. Remove the rug or carpet, put a thick and dense film to protect the flooring from accidental fall of a heavy tool or item of the design of the sofa.
Start disassembly of the sofa with detaching sidewalls. Wrench Unscrew the mounting, possibly holding them from free fall.
Any convenient way to label the parts of the folding cushion of the planes on the right and left in order after repair to collect them in the correct order. Disassemble the mechanisms.
Continue disassembly of the sofa, alternately disengaging the seat back. If you have the pallet, you need to dismantle it.
To remove the covers, use a pair of pliers and pull the bracket. Avoid strong jerks, try to do everything carefully. Otherwise, you can damage or even rip the fabric covers.
Proceed to repair the spring box, pre-pulling the mattress. Take a damp cloth to remove dust and wood chips, which are usually present in abundance at the site of attachment of the spring unit to the bottom of the sofa.
Test all sofa springs. This can be done without dismantling, but experts still recommended to pull out the entire unit and to determine the suitability for further use each spring separately.
A broken spring will remove it with pliers. Installing new, use furniture foam and dense old blanket for greater elasticity of the spring unit and increases the operating life. To do this, take a knife, cut the foam and stuff them spring unit, and then cover with a blanket and secure it around the perimeter with a hammer and 30-40 mm nails so that the blanket was as close as possible and collected the springs, not allowing them to fall in different directions. This removes the main cause of breakage or excessive stretching of the cushion springs - their asynchronous work.