The following is the product of a customer who makes non-standard mechanicalequipment

1.The hardness difference between two different points shall not exceed three values
2. There shall be no crack, slag inclusion, scratch and other defects
3. ChamferR0.5 or C0.5
4. No center holes are left at both ends
5. Heat treatment 58 ~ 62Hrc
6. Material GCr15

No.	Name	Process content	Use equipment
1	Heat treatment	Normalizing treatment
2	CNCTurning	Clamp the left end, turn the outer circle to 20.8mm, and turn the process boss on the right end face φ 8x10mm, cut the groove 4.5mm from the right end face according to the drawing φ 17x3mm, chamfer C2	Turning lathe
3	CNCTurning	Flip clamp φ 20.8mm outer circle, process the other end face, ensure the total length of 140mm, and turn the end face process boss φ 8x10mm, ensure the effective length of the workpiece is 120.5mm, chamfer C2	Turning lathe
4	Heat treatment	Quenching 58 ~ 62Hrc
5	Cold treatment	Liquid nitrogen cold treatment
6	Grinding	Grind both ends	Grinding machine
7	Grinding	Grinding φ 20. Ensure that the clearance between plunger and plug sleeve is 0.005 ~ 0.008mm	Grinding machine
8	Wire cutting	Cut off the process bosses at both ends to ensure that the workpiece is 120.5mm	Wire cutting machine
9	Grinding	The grinding end face shall be 120mm in length and 0.006mm in perpendicularity, and shall be marked with the supporting plug sleeve	Grinding machine
10	Testing	Check the size of each part according to the drawing, check whether there are cracks, slag inclusions, scratches and other defects, test the hardness, and check the metallographic structure of the cut materials	Vernier caliper、 Micrometer、 profile projector

1. Due to the high stress and wear resistance of the plunger, there are requirements for the metallographic structure and chemical composition of the material.
2. Normalize the material to eliminate stress, improve the internal structure of the material and improve the processing performance.
3. The fitting clearance requirements of 0.005 ~ 0.008 are very strict. During processing, matching should be adopted. First make a plug sleeve, and then process the plunger parts to match it. In order to ensure material stability and reduce deformation, cold treatment shall be carried out after quenching. After cleaning, conduct cooling treatment at - 60 ~ 80 ℃ for 2 hours, and then conduct tempering treatment for no more than 4 hours.
4. Because the center hole cannot be reserved, the process boss shall be reserved during blanking, and the size of both ends shall be extended by 8 ~ 10mm
5. Because the verticality requirement of 0.006 is relatively high, high-precision grinder is used for processing. Sufficient coolant is required during processing to prevent parts from overheating. The final dimension measurement is carried out in a room with a constant temperature of 20 ℃.
6. Parts φ Fillet the 17x3mm groove bottom to avoid cracks.
7. Cylindricity measurement: place the workpiece on the V-block and measure it with a micrometer.
8. The perpendicularity needs to be checked with optical measurement.

The customers of this batch of products are very satisfied and have been cooperating with us until now.

*The cases we show here have been agreed by the customers.

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