| Hydraulic elbow machine and cold push elbow machine
Hydraulic elbow machine in the production process of pipe fittings in the use of intermediate frequency power heating equipment, cold push elbow machine in the production process does not need intermediate frequency heating equipment, this is the difference between hydraulic elbow machine and cold push elbow machine and different.
Hydraulic elbow machine production is the main power is the hydraulic cylinder, heating method is medium frequency heating (in addition to the use of coal stove and natural gas heating).
We can make the diameter of the hydraulic elbow machine from 21mm to 1620mm and the wall thickness from 3mm to 120mm
We can make the diameter of the elbow produced by the cold push elbow machine from 21mm to 630mm and the wall thickness from 3mm to 30mm.
Cold push elbow machine is mainly characterized by low cost, but low efficiency, the need for more artificial
The main characteristics of mandrel type cold retreat elbow machine is high cost, but also high efficiency, and save manpower
The above briefly introduces the difference between the hydraulic elbow machine and the cold push elbow machine.
Push-making machine is a machine for making pipe fittings at the connecting pipe bend. The elbow produced is the largest proportion in the pipe system, which is about 80%.Now the seamless elbow forming process has hot push, stamping, extrusion and so on.Can be divided into hot push elbow machine and cold push elbow machine.
The forming process of the push-making machine is to put the tube billet into the outer die. After the upper and lower die is closed, the tube billet moves along the gap reserved between the inner die and the outer die to complete the forming process under the push of the push rod.The forming principle of cold extrusion elbow by cold extrusion mechanism is simple. The forming process of cold extrusion elbow is made use of professional forming machine.In the process of pushing, the wall thickness made by the cold pushing mechanism will not change in the normal process, but sometimes the wall reduction phenomenon will occur in some places due to the reason of the pushing equipment.
The wall thickness of the elbow made by the cold extrusion mechanism of the inner and outer die is uniform, and the size fault is less. The precision of the inner and outer die adopted in this kind of process is higher, and the wall thickness fault of the pipe billet is more demanding.
Push the machine
Cold Push Machine in the process of production equipment, there will be product distortion phenomenon, so how to solve the distortion problem?
1. Accurate calculation of neutral layer in deformation zone, accurate calculation of materials used in deformation zone, and good symmetry of roller machining.
2. The non-deformation area should be free from pressure as far as possible (such as the bottom of the slide rail), and the clearance of each area of the upper and lower rollers should be consistent during assembly.
3. Before the material is bitten into, the guide bevel should be set according to the state of the front roller. Before the stable compression, the material slides smoothly in the roll.
4, roller processing accuracy is the key, for this reason, specially made special tools under the projector, magnify 20 times for detection.
5, the main transmission side, the roller cone bearing, to ensure that the spindle radial runout in 0.04mm inside and outside, to ensure that the spindle will not move left and right, the ordinary ball bearing itself has a clearance, in the precise transmission can not avoid the axial movement.
6. The problem of bending and distortion in production is mainly caused by unbalanced force, left and right force imbalance, left and right bending, and upper and lower force imbalance, resulting in distortion.Solution: design force balance, accurate processing, convenient installation and adjustment.
708-709.
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