CN105986075A - Screw production annealing process - Google Patents

Abstract

The invention discloses a screw production annealing process, which is characterized by comprising the steps of: 1) feeding: a wire rod to be processed is hanged into a furnace, the furnace should be tightly covered by a furnace cover, 7 coils are simultaneously processed in one furnace, each coil is about 1.2 ton/coil; 2) heating: the temperature in the furnace is slowly increased for 3 to 4 hours to a specified temperature; 3) thermal insulation: the material 1018, 1022 wire rods are kept for 4 to 6h at the temperature of 680 to 715 DEG C, the material is 10B21, 1039, and CH38F wire rods are kept for 5.5 to 7.5 h at the temperature of 740 to 760 DEG C; and 4) cooling: the furnace temperature is slowly (about 3 to 4 hours) reduced to below 550 DEG C, and then furnace is cooled to the room temperature. The effects of the process for improving the hardness of the wire rod and processing at room temperature are good, and the oxide films and decarburization phenomenon are not generated on the surface.

Description

Screw produces annealing process

Technical field

The present invention relates to a kind of screw and produce annealing process.

Background technology

In order to strengthen reduction screw wire rod hardness, improveing wire rod room temperature processability, add man-hour requirement at screw and anneal screw wire rod, current annealing process is bad to the effect of improvement wire rod hardness and room temperature processability.

Summary of the invention

Because the drawbacks described above of prior art, the technical problem to be solved is to provide a kind of screw and produces annealing process, and this annealing process is effective to improvement wire rod hardness and room temperature processability, and surface does not has oxide-film and decarburization phenomenon.

For achieving the above object, the invention provides a kind of screw and produce annealing process, it is characterised in that comprise the steps,

1) pan feeding: need to hang in stove by wire rod to be processed, notice that bell should cover tightly, a stove processes volume 7 simultaneously, often rolls up about 1.2 tons/volume；

2) heat up: in-furnace temperature was slowly increased to set point of temperature through 3-4 hour；

3) insulation: material 1018,1022 wire rod keeps 4-6h at 680 DEG C-715 DEG C, and material is 10B21, and 1039, CH38F wire rods keep 5.5-7.5 h at 740 DEG C-760 DEG C；

4) cooling: in-furnace temperature slowly (about 3-4 hour) is down to less than 550 DEG C, then cools to room temperature with the furnace.

The invention has the beneficial effects as follows: the present invention is to improvement wire rod hardness and room temperature processability effective, and surface does not has oxide-film and decarburization phenomenon.

Detailed description of the invention

Technical scheme disclosed by the invention is that a kind of screw produces annealing process, comprises the steps, 1) pan feeding: need to hang in stove by wire rod to be processed, notice that bell should cover tightly, a stove processes volume 7 simultaneously, often rolls up about 1.2 tons/volume；2) heat up: in-furnace temperature was slowly increased to set point of temperature through 3-4 hour；

3) insulation: material 1018,1022 wire rod keeps 4-6h at 680 DEG C-715 DEG C, and material is 10B21, and 1039, CH38F wire rods keep 5.5-7.5 h at 740 DEG C-760 DEG C；4) cooling: in-furnace temperature slowly (about 3-4 hour) is down to less than 550 DEG C, then cools to room temperature with the furnace.

The present invention is to improvement wire rod hardness and room temperature processability effective, and surface does not has oxide-film and decarburization phenomenon.

The preferred embodiment of the present invention described in detail above.Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to the design of the present invention without creative work.Therefore, all technical staff in the art, all should be in the protection domain being defined in the patent claims the most on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.

Claims (1)

1. a screw produces annealing process, it is characterised in that comprise the steps,

1) pan feeding: need to hang in stove by wire rod to be processed, notice that bell should cover tightly, a stove processes volume 7 simultaneously, often rolls up about 1.2 tons/volume；

2) heat up: in-furnace temperature was slowly increased to set point of temperature through 3-4 hour；

3) insulation: material 1018,1022 wire rod keeps 4-6h at 680 DEG C-715 DEG C, and material is 10B21, and 1039, CH38F wire rods keep 5.5-7.5 h at 740 DEG C-760 DEG C；

4) cooling: in-furnace temperature slowly (about 3-4 hour) is down to less than 550 DEG C, then cools to room temperature with the furnace.