OEM CNC machining metal parts heavy machining companies
- There is a problem
The vacuum heat treatment model of our unit is VQQ2-65 double-chamber vacuum quenching furnace, with an effective heating area of 600mm×400mm×400mm. This is a horizontal vacuum heat treatment furnace that uses a trolley to transfer parts between the cold chamber and the hot chamber. A universal quenching basket is used as shown in Figure 1.OEM CNC machining metal parts heavy machining companies
Normal heat treatment production can be achieved by using this basket. Small parts can be tied in series and hung on the wall of the basket, and large parts can be placed at the bottom of the basket. According to “6.2.3” in HB/Z136-2000 “Heat Treatment Process of Aerospace Structural Steel”, large bolts, docking assemblies and other large parts should be placed in a single layer in the heating furnace. It is prohibited to stack the parts in two layers And more than two layers.” This is to prevent insufficient heating of large parts and deformation of the underlying parts due to excessive stress due to the weight of the parts themselves during the heating process. Therefore, for each heat treatment furnace, there is a lot of unused space in the quenching basket.
At the same time, the vacuum furnace is a cold wall radiation heating type, and the convective and conductive heat transfer effects are extremely weak. Therefore, in the vacuum furnace, the time for parts to reach temperature lags behind that of the furnace. The time difference becomes the heating lag time of the parts, and the heating needs to be extended. Compensate for holding time. Therefore, the heating and holding time of a vacuum furnace is longer than that of an ordinary air furnace. The characteristics of the vacuum furnace determine that the parts can only heat up with the furnace. OEM CNC machining metal parts heavy machining companies
In view of the above reasons, each furnace of vacuum heat treatment requires a long production time. Increasing the loading capacity of each basket can significantly improve the efficiency of the vacuum furnace. Therefore, on the premise of ensuring quality, improving the loading capacity of the vacuum furnace can create huge benefits.
2.Improvement
Place a column at each corner of the vacuum furnace quenching basket as shown in Figure 2. Let the height of the column exceed the height of the workpiece by about 20cm. After placing a layer of workpieces, place a support plate in the basket as shown in Figure 3. The four columns just support the board, and the parts are placed on the board as shown in Figure 4. By analogy, if circumstances permit, the third layer can be placed. In this way, each layer of parts does not contact each other in the quenching basket, and each layer has a large space to ensure subsequent heating and cooling.
3.Improve the effect
Through the improvement of the quenching basket, it has the following advantages: OEM CNC machining metal parts heavy machining companies
(1) The quenching basket space is further utilized
It turns out that in order to ensure uniform heating and subsequent cooling, and to prevent deformation caused by the weight of the workpiece during the heating process, only one layer is installed in the basket for large items. Reloading is now possible via the corner struts and the center plate. Keep the parts on the upper layer from contacting the parts on the bottom layer. At the same time, the frame structure is adopted to fully ensure that the parts are heated and cooled evenly during the entire heat treatment process. Each time the charge is doubled, the efficiency of the vacuum quenching furnace is doubled, and the long-term economic benefits are considerable.
(2) Simple operation
The pillars and the middle plate are not forcibly connected to the material frame. The operator just places a pillar on each of the four corners of the original material basket, and then puts the plate on it. To prevent tilting, if necessary, iron wires can be used to tie the middle partition plate to the vacuum quenching basket. The overall labor intensity is not high, and it is very convenient to place and take out.
(3) Versatility and compatibility
The length of the pillars is processed in several groups according to the size of the workpieces that are usually operated, and selected according to the size of the workpieces, which can ensure the use of vacuum quenching of different large-scale workpieces. It has strong versatility. At the same time, by laying a wire mesh at the bottom of the basket, vacuum quenching of multi-layer small parts can also be carried out, making the quenching basket also compatible with small parts. OEM CNC machining metal parts heavy machining companies
(4) Convenient later maintenance
The bottom plate of the quenching material frame will deform after multiple heat treatments, and the quenching basket needs to be corrected. The bottom correction of the quenching basket as a whole is very cumbersome and difficult to perform on the press. The middle support plate can be calibrated separately as an independent component, and the calibration can be easily completed using a press.
- Conclusion
In short, through the improvement of the vacuum furnace quenching basket, product quality is ensured, the furnace loading capacity is increased, operation and later maintenance are convenient, the production cycle is saved, and economic benefits are improved. OEM CNC machining metal parts heavy machining companies