Threaded Shaft- Case Study

The threaded shaft is a CNC milling part used in the chemical industry. It is difficult to process, and the processing steps are many and complicated. Customers who buy this part usually buy it in large quantities from Precision Parts Sellers. It is made of stainless steel by custom CNC milling, but because it is used in the chemical industry, the amount of damage and consumption is quite amazing, and for customers who purchase this threaded shaft, their respective needs are different, and they basically need custom processing. Precision Parts Sellers will give considerable discounts for a certain number of cases.

Product parameters

Product Name: Threaded shaft

Application: Chemical industry

Material: 1.4435 round bar applied CNC Machining Process: CNC Turning, CNC Milling

Threaded Shaft Processing Characteristics

  1. It is very easy to harden in the process. Because of the large plasticity of stainless steel, the character is distorted during plastic deformation, and the strengthening coefficient is very large; and the Austenite is not stable enough, under the action of cutting stress, part of the Austenite will be transformed into Martensite; in addition, compound impurities are in the cutting Under the action of heat, it is easy to decompose into a diffuse distribution so that a hardened layer is produced during cutting. The work hardening caused by the previous feed or the previous process seriously affects the smooth progress of the subsequent process.
  2. Large cutting force. Stainless steel has large plastic deformation during cutting, especially austenitic stainless steel (its elongation is more than 1.5 times that of No. 45 steel), which increases the cutting force. At the same time, the work hardening of stainless steel is serious, and the thermal strength is high, which further increases the cutting resistance, and it is also difficult to curl and break the chips. Therefore, the cutting force for processing stainless steel is large.
  3. High cutting temperature. The plastic deformation and the friction with the tool during cutting are very large, and the cutting heat is generated. In addition, the thermal conductivity of stainless steel is about 1/2 to 1/4 of that of No. 45 steel. A large amount of cutting heat is concentrated in the cutting area and the tool. On the interface where the chips contact, the heat dissipation condition is poor. Under the same conditions, the cutting temperature of 1.4435 is about 200°C higher than that of No. 45 steel.

The most important thing here is the first point. It is not difficult to see that because of the high plasticity of stainless steel and the instability of austenite, it will cause great difficulty in processing. If Precision Parts Sellers do not pay attention or have insufficient experience If so, a large amount of stainless steel may often be wasted due to ignorance of material properties, resulting in a substantial increase in cost. The second point is that the hardening of stainless steel is serious. If the temperature is not reached, it will greatly increase the difficulty of cutting. Although the thermal strength of stainless steel is high, if Precision Parts Sellers forcibly increase the temperature of stainless steel, the temperature will be too high and it will easily lead to soft deformation of stainless steel, so only It can be to increase the cutting force, and the cutting heat is inevitably greatly increased here, but it is within the thermal strength of stainless steel.

Threaded Spindle Processing Technology and Difficulties

Quantity of tool: 7 pcs

Tool Type: 90 ° of external circular knife, 2 mm cutting knife, 55° external thread cutter, ∅ 2 mm center drill,  ∅8 mm 90 °drill, ∅3.9mm Water fountain drill, ∅ 4.1 mm end mill.


Threaded Shaft Production Process:

①Coarse and fine turning two outer circles ∅5.2mm, ∅14mm, and G3/8 thread outer circle∅16.663mm.

②External thread G3/8 turning.

 

③Cut off the parts → turn to process deep holes ∅8mm, ∅4.1mm.

Because of the original characteristics of 1.4435, the work hardening is severe, the cutting force is large, and the cutting temperature is high. When processing such small and deep flat-bottomed holes, it is easy to cause the drill to break directly or the parts to be damaged due to untimely cooling and unsmooth chip removal. Therefore, this is also a difficulty in processing this part.

  1. ∅8mm90°drill bit for processing deep holes ∅8mm.
  2. ∅3.9mm water jet drilling rough-machined deep hole ∅4.1mm, more effective cooling and chip removal, to the greatest extent clear the bottom of the deep hole ∅4.1mm margin.
  3. ∅4.1mm end mill for final finishing.

Threaded Shaft Product Display

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