CN117259625A - Preparation method for producing cylindrical forging piece by large-scale quick forging press - Google Patents

Abstract

The invention discloses a preparation method for producing a cylindrical forging piece by a large-scale rapid forging press, which comprises the following steps of S1, first firing time and second firing time: repeatedly upsetting and pulling; s2, third firing time: upsetting and polishing to form cakes; s3, fourth heat time: punching the front and back sides; s4, fifth firing time: reaming the horse frame; s5, sixth heat: and (5) collecting and pulling the core rod, discharging and removing the rod. The invention utilizes a large-scale quick forging press, combines the forging technology of annular and conventional cylindrical forgings by using the free forging principle, and forms the method for producing the cylindrical forgings by using the large-scale quick forging press.

Description

Preparation method for producing cylindrical forging piece by large-scale quick forging press

Technical Field

The invention relates to hot working of metal materials in the metallurgical industry, in particular to a preparation method for producing cylindrical forgings by a large-scale rapid forging press.

Background

Over a decade in production with a 40MN rapid forging press, the number of products and varieties produced is large and variable with customer demand, and new challenges are presented to how to produce each acceptable product. The same amount of special-shaped forgings such as cylindrical forgings at the present stage is increased, and how to produce the qualified products, so that the economic benefit is improved, and the method is very urgent.

The existing operation method of annular and conventional cylindrical forgings (the length dimension of the forgings is less than or equal to the outer diameter dimension of the forgings). Mainly has the problems that the length dimension of the produced forging is not less than the outer diameter dimension of the forging, the product is easy to crack during forging, the drawing end part of the core rod is uneven, the removal (rod removal) of the finished core rod is difficult, and the like.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a preparation method for producing cylindrical forgings by a large-scale rapid forging press, solves a plurality of unstable operation factors in the process of producing cylindrical forgings, and successfully realizes batch production of the cylindrical forgings.

In order to achieve the above purpose, the invention adopts the following technical scheme:

a preparation method for producing cylindrical forgings by a large-scale quick forging press comprises the following steps:

s1, a first firing rate and a second firing rate: repeatedly upsetting and pulling;

s2, third firing time: upsetting and polishing to form cakes;

s3, fourth heat time: punching the front and back sides;

s4, fifth firing time: reaming the horse frame;

s5, sixth heat: and (5) collecting and pulling the core rod, discharging and removing the rod.

Preferably, the step S1 further includes:

the jaw of the manipulator is replaced by a casting pliers, the casting pliers clamp the steel ingot and convey the steel ingot to a lower flat anvil of the rapid forging press, the steel ingot is rolled to form an outer circle, and then the casting pliers are utilized to erect the steel ingot for repeated upsetting and pulling operations.

Preferably, in repeated upsetting and pulling of the steel ingot, upsetting is carried out for 2-3 times, and the steel ingot is pulled out smoothly and excessively in size and kept straight.

Preferably, the step S2 further includes:

and the throwing pliers are used for conveying the steel ingot to a lower flat anvil of the rapid forging press, and upsetting and excircle throwing operation is carried out on the steel ingot to form a cake material.

Preferably, the step S3 further includes:

placing the cake material on a turntable, placing the punch heads of the throwing pliers on the cake material, and performing first punching operation; the throwing pincers are used for carrying out second punching operation on the cake material reversely and then placed on a drain pan; and then, carrying out a third punching operation, punching out the core material, and completing the punching operation to form the ring material.

Preferably, the step S4 further includes:

the jaw of the manipulator is replaced by a flat jaw, and then a pair of horse frames and a core rod are prepared; and placing the ring material on an upper falling sleeve of the turntable, rotating the turntable by 90 degrees, penetrating the core rod into a hole of the ring material, and placing the ring material on the horse frame by the core rod for reaming operation.

Preferably, the turntable is a phi 2000mm turntable, and the core rod is a phi 210mm core rod.

Preferably, the step S5 further includes:

placing the ring material on a lower flat anvil of the rapid forging press, penetrating a phi 370mm core rod into a hole of the ring material, and performing 6-angle drawing forging by using the upper flat anvil and the lower flat anvil of the rapid forging press, wherein the size is controlled to be phi 800mm; then 12-angle drawing forging is carried out, and the size is controlled to be phi 815mm; then, 24-angle drawing forging is carried out, and the dimension is controlled to phi 830mm; and finally, extracting the core rod with the diameter of 370mm from the ring material to form the cylindrical forging.

The preparation method for producing the cylindrical forging by the large-scale quick forging press provided by the invention breaks through the original operation method of annular and conventional cylindrical forgings by utilizing the equipment advantages of the quick forging press (the original length dimension of the cylindrical forgings is only suitable for being smaller than or equal to the outer diameter dimension of the forgings, and the length dimension of the cylindrical forgings pointed by the preparation method is more than 1.3-2.0 of the outer diameter dimension of the forgings), and is greatly optimized in the operation sequence and control key points of production. Meanwhile, the preparation method of the invention is established, the operation standard of free forging is further standardized, a plurality of unstable operation factors existing in the process of producing the cylindrical forgings are solved, and the mass production of the cylindrical forgings is successfully realized.

Drawings

FIG. 1 is a schematic flow chart of the preparation method of the present invention;

FIGS. 2 to 4 are schematic views showing step S1 of the embodiment of the preparation method of the present invention;

FIGS. 5 to 7 are schematic views showing step S2 of the preparation method according to the embodiment of the present invention;

FIGS. 8 to 10 are schematic views showing step S3 of the preparation method according to the embodiment of the present invention;

FIGS. 11 to 12 are schematic views showing step S4 of the preparation method according to the embodiment of the present invention;

fig. 13 to 15 are schematic views of step S5 of the preparation method according to the present invention.

Detailed Description

In order to better understand the above technical solution of the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and examples.

Referring to fig. 1, the preparation method for producing cylindrical forgings by using a large-scale rapid forging press provided by the invention comprises the following steps:

s1, a first firing rate and a second firing rate: repeatedly upsetting and pulling;

the jaw of the manipulator is replaced by a casting pliers, the casting pliers clamp the steel ingot and send the steel ingot to a lower flat anvil of the rapid forging press, the steel ingot is rolled to form an outer circle, and then the casting pliers are utilized to erect the steel ingot for repeated upsetting and pulling operations.

In repeated upsetting and pulling of steel ingots, upsetting is carried out for 2-3 times, skew is prevented, and the size of the pulled steel ingot is smooth and excessive and kept straight.

S2, third firing time: upsetting and polishing to form cakes;

the throwing pliers send the steel ingot to the lower flat anvil of the quick forging press, put in the middle, upset the steel ingot and throw the excircle (commonly called as three upsetting and three throwing) to form cake materials. And (3) controlling the three-upsetting three-polishing size, and preventing the concave center and the corner from seriously tilting.

S3, fourth heat time: punching the front and back sides;

the polishing pliers are used for placing the cake materials on a phi 2000 rotary table, centering the cake materials, centering a punch with the diameter of 230mm on the cake materials, and performing first punching operation; after the cake materials of the pliers are reversed, the pliers are placed on a drain pan in a centering way, and a second punching operation is carried out; and then, carrying out a third punching operation, punching out the core material, and completing the punching operation to form the ring material.

S4, fifth firing time: reaming the horse frame;

the jaw of the manipulator is replaced by a flat jaw, and a pair of medium-sized horse frames (the height is about 1500 mm) and a core rod with phi 210mm are prepared; and (3) placing the ring material on an upper falling sleeve of a phi 2000mm rotary table, stably placing, rotating the phi 2000mm rotary table by 90 degrees, penetrating a phi 210mm core rod into a phi 230mm hole of the ring material, placing the core rod ring material on a horse frame, performing reaming operation, and controlling an inner hole to be phi 380-phi 390mm.

S5, sixth heat: collecting and pulling a core rod, discharging and removing the rod;

placing the ring material on a lower flat anvil of a quick forging press, centering, penetrating a core rod with the diameter of 370mm into a hole with the diameter of 380-390 mm of the ring material, and performing 6-angle drawing forging by using the upper flat anvil and the lower flat anvil of the quick forging press, wherein the size is controlled to be 800mm; then 12-angle drawing forging is carried out, and the size is controlled to be phi 815mm; then, 24-angle drawing forging is carried out, and the dimension is controlled to phi 830mm; and finally, extracting the core rod with the diameter of 370mm from the ring material to form the cylindrical forging.

The traditional forging method is as follows: square (4 angle) to 8 angle to 16 angle to 32 angle. Now, 6 corners corresponding to 800mm diameter, 12 corners corresponding to 815mm diameter, 24 corners corresponding to 830mm diameter are adopted.

Examples

In connection with fig. 2 to 14, this example takes as an example the production of a cylindrical forging with a steel number of 18Ni, an ingot shape of phi 600mm 4t, a dimension of phi 790 (+ 30, -0) phi 420 (+ -0, -20) 1200 (+ -100, -0) mm. The method comprises the following specific steps:

s1, a first firing rate and a second firing rate: repeatedly upsetting and pulling;

1. preparation of

1) Upper and lower flat anvils 1, 2 (600 mm) of the quick forging press are a pair;

2) Manipulator jaw state: changing to a polishing clamp 3;

3) And (5) using the trolley for standby.

2. Production operation sequence

1) The trolley clamps the steel ingot 100 onto a lower flat anvil 2 of the rapid forging press, and is placed in the middle;

2) After the casting tongs 3 of the manipulator are used for clamping the steel ingot 100, the steel ingot 100 is subjected to operations such as rolling an outer circle (see fig. 2), upsetting (see fig. 3), drawing (see fig. 4) and the like;

3) Returning the steel ingot 100 to the furnace, heating and preserving heat according to the process.

3. Notice matters

1) The size of the steel ingot 100 is smooth and excessive when the outer circle is rolled;

2) Upsetting the thick part for 2-3 times to prevent deflection;

3) The drawn ingot 100 is smooth and excessive in size and remains straight.

S2, third firing time: upsetting and polishing to form cakes;

1. preparation of

1) Upper and lower flat anvils 1, 2 (600 mm) of the quick forging press are a pair;

2) Manipulator jaw state: continuing to use the throwing clamp 3;

3) The trolley is free of rails for standby;

4) Two packets of asbestos are required for each ingot 100.

2. Production operation sequence

1) The trolley clamps the steel ingot 100 onto a lower flat anvil 2 of the rapid forging press, and is placed in the middle;

2) After the material (steel ingot 100) is clamped by the clamp 3 of the manipulator, upsetting and polishing the outer circle (commonly called as three upsetting and three polishing) of the steel ingot 100 is carried out (see fig. 5 to 7);

3) Aiming at steel with high forging stopping temperature requirement, after the outer circle is polished, asbestos is wrapped;

4) Returning the formed cake 200 to the furnace, heating and preserving heat according to the process.

3. Notice matters

1) The size control operation of the steel ingot 100 during three upsetting and three casting prevents the concave center and the corner from seriously tilting;

2) When the asbestos packing operation is carried out, the outer circle size of the steel ingot 100 is reduced by 5mm.

S3, fourth heat time: punching the front and back sides;

1. preparation of

1) Upper and lower flat anvils 1, 2 (600 mm) of the quick forging press are a pair;

2) Manipulator jaw state: continuing to use the throwing clamp 3;

3) One part of phi 2000mm rotary table 4, one part of drain pan 5 and three parts of positive and negative punch 6 (phi 230 mm);

4) The trolley is free of rails for standby;

5) One car is driven in the 40MN area.

2. Production operation sequence

1) The trolley clamps the cake 200 onto a phi 2000mm turntable 4, and is placed in the middle;

2) The punch 6 of the manipulator throwing clamp 3 is centered on the cake discharging material 200 to perform a first punching operation;

3) The manipulator throwing clamp 3 clamps the cake material 200 on the middle leakage plate 5 after turning back, performs the second punching operation, performs the third punching operation, punches out the core material, and completes the punching operation (see fig. 8 to 10).

5) Returning the formed ring material 300 to the furnace, heating and preserving heat according to the process.

3. Notice matters

1) During the first and second punching operations, the cake 200 must be placed in the middle to prevent deflection.

2) When the third punching operation is performed, if the height is insufficient, the punch 6 of the first punch is taken out.

S4, fifth firing time: reaming the horse frame;

1. preparation of

1) Upper and lower flat anvils 1, 2 (600 mm) of the quick forging press are a pair;

2) Manipulator jaw state: changing into a flat jaw 7;

3) A pair of medium-sized horse frames 8 (the height is about 1500 mm), and a phi 210mm core rod 9;

4) Phi 2000mm turntable 4;

5) The upper falling sleeve 10 with the diameter of about 400mm is one piece;

6) The trolley is free of rails for standby;

7) One car is driven in the 40MN area.

2. Production operation sequence

1) The trolley clamps the ring material 300 to the upper falling sleeve 10 of the phi 2000mm turntable 4, and the ring material is placed stably;

2) The phi 2000mm rotary table 4 rotates 90 degrees, and the phi 210mm core rod 9 penetrates into the hole of the ring material 300;

3) The phi 210mm mandrel 9 is put into the middle of the horse frame 8 to carry out reaming operation (see fig. 11-12).

4) And (5) returning the ring material 300 to the furnace after reaming, heating and preserving heat according to the process.

3. Notice matters

1) The reaming size is controlled to be phi 380 mm-phi 390mm;

2) The horse frame 8 is used for leaning, so that the hole shape is prevented from deflecting during reaming;

3) And (5) performing temperature robbing operation.

S5, sixth heat: collecting and pulling a core rod, discharging and removing the rod;

mandrel retracting

1. Preparation of

1) Upper and lower flat anvils 1, 2 (600 mm) of the quick forging press are a pair;

2) Manipulator jaw state: changing into a flat jaw 7;

3) Phi 370mm mandrel 11 in one piece (with small head);

4) And (5) using the trolley for standby.

2. Production operation sequence

1) The trolley clamps the ring material 300 onto the lower flat anvil 2 of the quick forging press, and is placed in the middle;

2) The flat jaw 7 of the manipulator penetrates a core rod 11 with the diameter of 370mm into a hole of the ring material 300 (see figure 13);

3) The upper and lower flat anvils 1, 2 of the quick forging press are subjected to 120 degrees (hexagonal drawing forging) and the size is controlled to be phi 800mm;

4) Then 12-angle operation is carried out, and the dimension is controlled to be phi 815mm.

Discharging stripping rod

1. Production operation sequence

Immediately after the 12-angle operation, 24-angle operation was performed, and a dimension control of phi 830mm (see fig. 14 to 15) was performed, forming a cylindrical forging 400.

2. Notice matters

1) The angle control is needed when the angle dividing operation is carried out;

2) When the two ends of the cylindrical forging 400 are forged, the feeding amount of the upper flat anvil 1 and the lower flat anvil 2 is controlled to be 200 mm-300 mm, and the feeding amount of the other flat anvils is controlled to be about 400 mm;

3) Performing temperature robbing operation, and enhancing top command;

4) The length of cylindrical forging 400 at this time may be controlled by the size of the diameter.

The preparation method provided by the invention is established, the operation sequence and the control key points of the production of the cylindrical forgings are greatly optimized, the operation standard of free forging is further standardized, a plurality of unstable operation factors existing in the process of producing the cylindrical forgings are solved, and the batch production of the cylindrical forgings is successfully realized.

It will be appreciated by persons skilled in the art that the above embodiments are provided for illustration only and not for limitation of the invention, and that variations and modifications of the above described embodiments are intended to fall within the scope of the claims of the invention as long as they fall within the true spirit of the invention.

Claims (8)

1. The preparation method for producing the cylindrical forging piece by the large-scale rapid forging press is characterized by comprising the following steps of:

s1, a first firing rate and a second firing rate: repeatedly upsetting and pulling;

s2, third firing time: upsetting and polishing to form cakes;

s3, fourth heat time: punching the front and back sides;

s4, fifth firing time: reaming the horse frame;

s5, sixth heat: and (5) collecting and pulling the core rod, discharging and removing the rod.

2. The method for producing a cylindrical forging piece by using a large-sized rapid forging press as recited in claim 1, wherein said step S1 further comprises:

the jaw of the manipulator is replaced by a casting pliers, the casting pliers clamp the steel ingot and convey the steel ingot to a lower flat anvil of the rapid forging press, the steel ingot is rolled to form an outer circle, and then the casting pliers are utilized to erect the steel ingot for repeated upsetting and pulling operations.

3. The method for manufacturing cylindrical forgings by using the large-scale rapid forging press according to claim 2, wherein the method comprises the following steps: in the repeated upsetting and pulling of the steel ingot, upsetting is carried out for 2-3 times, and the steel ingot is pulled out in a smooth and excessive size and kept straight.

4. The method for producing a cylindrical forging piece by using a large-sized rapid forging press as recited in claim 2, wherein said step S2 further comprises:

and the throwing pliers are used for conveying the steel ingot to a lower flat anvil of the rapid forging press, and upsetting and excircle throwing operation is carried out on the steel ingot to form a cake material.

5. The method for producing a cylindrical forging piece by using a large-sized rapid forging press as recited in claim 4, wherein said step S3 further comprises:

placing the cake material on a turntable, placing the punch heads of the throwing pliers on the cake material, and performing first punching operation; the throwing pincers are used for carrying out second punching operation on the cake material reversely and then placed on a drain pan; and then, carrying out a third punching operation, punching out the core material, and completing the punching operation to form the ring material.

6. The method for manufacturing a cylindrical forging piece by using a large-sized rapid forging press as recited in claim 5, wherein said step S4 further comprises:

the jaw of the manipulator is replaced by a flat jaw, and then a pair of horse frames and a core rod are prepared; and placing the ring material on an upper falling sleeve of the turntable, rotating the turntable by 90 degrees, penetrating the core rod into a hole of the ring material, and placing the ring material on the horse frame by the core rod for reaming operation.

7. The method for manufacturing cylindrical forgings by using the large-scale rapid forging press according to claim 6, wherein the method comprises the following steps: the rotary table is a phi 2000mm rotary table, and the core rod is a phi 210mm core rod.

8. The method for manufacturing a cylindrical forging piece by using a large-sized rapid forging press as recited in claim 6, wherein said step S5 further comprises:

placing the ring material on a lower flat anvil of the rapid forging press, penetrating a phi 370mm core rod into a hole of the ring material, and performing 6-angle drawing forging by using the upper flat anvil and the lower flat anvil of the rapid forging press, wherein the size is controlled to be phi 800mm; then 12-angle drawing forging is carried out, and the size is controlled to be phi 815mm; then, 24-angle drawing forging is carried out, and the dimension is controlled to phi 830mm; and finally, extracting the core rod with the diameter of 370mm from the ring material to form the cylindrical forging.