CN106077377A - Biomass fuel granulator 4Cr13 ring mould rolles over ring new process for processing - Google Patents

Abstract

The invention belongs to the field of granulation machinery, and in particular relates to a new ring-rolling process of a 4Cr13 ring die. The new process of ring die ring rolling processing, which uses a horizontal ring rolling machine to directly roll ring blanks into ring die forgings, includes: blanking; bar blank heating; ring blank processing; ring blank heating; ring rolling forming and other steps. Compared with the traditional free forging process followed by a large amount of mechanical cutting to form a ring die, the present invention uses a ring rolling process to make the ring die forging that meets the requirements obtained by continuous extrusion and plastic deformation of the metal, and the metal material is fully deformed and flowed. , reducing internal defects, the internal structure of the ring die is more uniform, the internal quality of the ring die is good, the mechanical properties of the ring die are greatly improved, and the service life is increased by 30-35%.

Description

A New Technology of 4Cr13 Ring Die Ring Rolling for Biomass Fuel Pelletizer

technology neighborhood

The invention belongs to the field of granulation machinery, and in particular relates to a new ring-rolling process of a 4Cr13 ring die.

Background technique

The ring die pellet mill is the main equipment for producing biomass fuel pellets, and its service life has an important impact on the promotion of renewable biomass fuels and the saving of fossil fuels. The ring die is the core component of the ring die pellet mill, and it is also the most vulnerable part. The ring die produced by the traditional "cutting-piercing-punching-machining" free forging process has uneven distribution of internal structure and low mechanical properties, which makes the ring die poor in performance, easy to break, and low in life, which seriously restricts the manufacturing process. The service life of the granulator is improved. The new process of ring rolling forming is "cutting - pier roughening - punching - ring rolling processing". The new process directly processes the ring blank into a qualified ring die forging through the ring rolling process, which has the advantages of material saving, manpower saving and process safety. , low vibration and noise, high degree of automation, uniform internal structure of the processed ring die, good mechanical properties, etc., can effectively improve the quality of the ring die, prolong the service life of the ring die, and meet the actual application requirements.

Contents of the invention

The purpose of the present invention is to provide a new ring rolling process of 4Cr13 ring die, and propose a specific processing method, in order to improve the internal quality of the ring die, improve the mechanical properties of the ring die, thereby increasing the service life of the ring die. This process improves the utilization rate of materials and reduces the man-hours of parts processing. At the same time, the internal material structure of the ring die obtained is dense and the mechanical properties are good.

In order to achieve the purpose of the above invention, the technical solution adopted by the present invention is: a new ring die ring rolling processing process in which a ring blank is directly rolled into a ring die forging by using a horizontal ring rolling machine. The process includes the following steps:

1) Blanking: according to the ring die forging diagram, the steel ingot is blanked by a sawing machine to obtain a bar blank;

2) Bar blank heating: put the bar blank in a heating furnace at 650°C, preheat for 3 hours; heat slowly for 2 hours to 1150°C; hold for another 2 hours and then take it out of the furnace for forging;

3) Processing of ring blanks: Use a press to thicken and punch the heated bar blanks. The initial forging temperature is 1140°C and the final forging temperature is 900°C to obtain ring blanks;

4) Ring billet heating: Put the ring billet into the heating furnace and raise the temperature to 1150°C; heat it for another 2 hours and leave the furnace;

5) Ring rolling forming: put the ring blank out of the furnace on the radial and axial horizontal ring rolling machine, and insert the ring blank into the ring rolling core roller. The ring blank is extruded into a ring forging that conforms to the shape required by the ring die forging.

Further, the above-mentioned step 5) ring rolling forming specifically includes the following steps: the driving roller (7) of the ring rolling machine is actively rotated by the motor, the ring blank (4) is inserted into the core roller (8), and the core roller is straight along the direction of the driving roller Feed, under the action of friction, the ring blank (4) is squeezed and rotated in the rolling pass composed of the driving roll and the core roll. As the process progresses and the metal is continuously plastically deformed, the ring blank (4) The diameter gradually increases, and gradually forms the required shape of the forging; during the growth process of the ring, the upper cone roller (9) and the lower cone roller (10) maintain the flatness of the upper and lower surfaces of the ring blank, and the guide roller (11 ) and guide rolls (12) maintain rolling stability; finally, the ring blank (4) is extruded into a qualified ring die forging (6) that meets shape requirements and size requirements on the ring rolling machine.

Further, among the rolls of the above-mentioned ring rolling machine, the driving roll (7) and the core roll (8) form a semi-closed pass, and the upper and lower tapered rolls (9, 10) only maintain the flatness of the upper and lower surfaces of the ring blank, and do not participate in Axial rolling.

Compared with the traditional free forging process followed by a large amount of mechanical cutting to form a ring die, the present invention uses a ring rolling process to make the ring die forging that meets the requirements obtained by continuous extrusion and plastic deformation of the metal, and the metal material is fully deformed and flowed. , reducing internal defects, the internal structure of the ring die is more uniform, the internal quality of the ring die is good, the mechanical properties of the ring die are greatly improved, and the service life is increased by 30-35%.

Description of drawings:

Figure 1 is a flow chart of the traditional free forging process of the ring die;

Fig. 2 is a new process flow chart of ring die ring rolling processing of the present invention;

Figure 3 is a schematic diagram of the specific processing of ring die ring rolling;

Figure 4 is the second schematic diagram of the specific processing of ring die ring rolling.

detailed description:

Figure 1 is a simple flow chart of ring die forging processing. The traditional free forging process engineering is as follows: firstly, a bar blank (1) is obtained by blanking a sawing machine. Then put the billet into a heating furnace at 650°C, preheat for 3 hours; heat slowly for 2 hours to 1150°C; keep warm for 2 hours and then leave the furnace for forging; use a press to thicken and punch the heated blank, and start forging The temperature is 1140°C, and the final forging temperature is 900°C, that is, the process a, to obtain the ring blank (3). Then the cooled blank 3 is machined into a qualified ring die forging (5) in a mechanical cutting mode (b).

Fig. 2 is the new technological process of the ring die ring rolling processing of the present invention: firstly, the bar blank (2) obtained by blanking the sawing machine. Then put the billet into a heating furnace at 650°C, preheat for 3 hours; heat slowly for 2 hours to 1150°C; keep warm for 2 hours and then leave the furnace for forging; use a press to thicken and punch the heated blank, and start forging The temperature is 1140° C., and the final forging temperature is 900° C., that is, process a, to obtain the ring blank (4). Then, put the ring blank into the heating furnace again, and raise the temperature to 1150°C; heat it for another 2 hours and then take it out of the furnace, immediately put the ring out of the furnace on the radial and axial horizontal ring rolling machine, and insert the ring blank into the roller of the ring rolling core , under the combined action of the driving roll, the core roll and the upper and lower tapered rolls (process c), the ring blank is extruded into a ring forging (6) conforming to the required shape of the ring die forging.

Figure 3-4 is a specific process diagram of ring die ring rolling. The ring blank (4) obtained after heat preservation is immediately installed on the horizontal ring rolling machine. The extrusion process of the ring rolling machine is: the driving roller (7) actively rotates, the ring blank (4) is inserted into the core roller (8), and the core The roller is fed linearly along the direction of the driving roller. Under the action of friction, the ring blank (4) is squeezed and rotated. As the process progresses and the metal is continuously plastically deformed, the diameter of the ring blank (4) gradually increases, and Under the rotation of the upper tapered roller (9) and the lower tapered roller (10), the flatness of the upper and lower surfaces of the ring blank is maintained, and the growth process of the ring is also supported by the guide roller (11) and the guide roller (12). Finally, the ring blank (4) is extruded into a ring die forging (6) on the ring rolling machine.

Claims (3)

1. a biomass fuel granulator 4Cr13 ring mould rolles over ring new process for processing, it is characterised in that utilize horizontal type ring rolling machine The ring mould that annular blank is directly rolled over ring cyclization forging part rolles over ring new process for processing, comprises the following steps:

1) blanking: according to ring forging part figure, by sawing machine, steel ingot blanking is obtained bar blank；

2) bar blank heating: bar blank is put in 650 DEG C of heating furnaces, preheat 3 hours；It is slowly heated 2 hours and is warming up to 1150℃；Come out of the stove after being incubated 2 hours again forging；

3) annular blank processing: utilize forcing press that the bar blank after heating carried out upset, punching, initial forging temperature 1140 DEG C, Final forging temperature 900 DEG C, obtains annular element blank；

4) annular base heating: annular blank is put into heating furnace, is warming up to 1150 DEG C；Come out of the stove after being incubated 2 hours again；

5) loop forming is rolled over: the annular blank after coming out of the stove is seated on the axial horizontal type ring rolling machine in footpath, and ring blank is inserted in Ring Rolling Machine In core roller, under driving roller, core roller and the common effect boring roller up and down, annular blank is squeezed into and meets ring forging part requirement shape The annular forging piece of shape.

2. biomass fuel granulator 4Cr13 ring mould as claimed in claim 1 rolles over ring new process for processing, it is characterised in that: Described step 5) to roll over loop forming and specifically include following steps: Ring Rolling Machine drives roller (7) by driven by motor active rotation, annular blank (4) being inserted in core roller (8), core roller is along driving roller direction straight-line feed, and under the effect of frictional force, annular blank (4) is by driving In the rolling groove of action roller and core roller composition, it is squeezed and rotates, along with the continuous plasticity of carrying out and metal of process becomes Shape, annular blank (4) diameter progressively becomes big, and gradually forms forging requirement shape；In ring growth process, epicone rolling (9) With the flatness that lower cone roller (10) maintains annular blank upper and lower surface, it is steady that guide roller (11) and guide roller (12) maintain rolling Fixed；Finally, annular blank (4) is extruded as meeting the qualified ring forging part of shape need and dimensional requirement on Ring Rolling Machine (6)。

Described biomass fuel granulator 4Cr13 ring mould the most as claimed in claim 1 rolles over ring new process for processing, and its feature exists In: in the roll of Ring Rolling Machine, drive roller (7) and core roller (8) to constitute half-closed pass, bore roller (9,10) up and down and only maintain annular The flatness of blank upper and lower surface, is not involved in axially rolled.