CN210730929U

CN210730929U - Axial vibration centrifuge

Info

Publication number: CN210730929U
Application number: CN201921417641.1U
Authority: CN
Inventors: 张新宇; 张锦华; 徐华; 马利峰; 刘立国; 李栋
Original assignee: Shanghai Supezet Engineering Technology Co ltd; Supezet Jingjiang Equipment Manufacturing Co ltd
Current assignee: Shanghai Supezet Engineering Technology Co ltd; Supezet Jingjiang Equipment Manufacturing Co ltd
Priority date: 2019-08-29
Filing date: 2019-08-29
Publication date: 2020-06-12
Anticipated expiration: 2029-08-29

Abstract

The utility model discloses an axial vibrations centrifuge. The centrifugal machine is matched with a pipe die with a vibration flange in the middle, a vibration device is designed between a driving supporting roller set and a driven supporting roller set of the centrifugal machine, the vibration device comprises a rotating wheel device and an eccentric device, the eccentric device comprises an eccentric wheel and a power mechanism, and an eccentric groove is machined in the eccentric wheel. The rotating wheel device comprises two rotating wheels I, a steel plate and a rotating wheel II; the two rotating wheels I are fixedly arranged on the steel plate, and the distance between the two rotating wheels I corresponds to the width of the vibration flange; the steel plate can only freely move in the axial direction of the pipe die, and the rotating wheel II is arranged below the steel plate and matched with the eccentric groove. When the centrifugal machine cools molten metal of austenitic stainless steel or nickel-based heat-resistant steel, the cast dendrite can be broken by axial vibration of the pipe die, cast crystal grains are reduced, and pressure is relieved for subsequent deformation processing.

Description

Axial vibration centrifuge

Technical Field

The utility model discloses be applied to the centrifugal casting field, concretely relates to centrifuge suitable for centrifugal casting austenite material casts steel pipe.

Background

The centrifugal casting technology belongs to a mature technology in China, and not only are more manufacturers used for centrifugally manufacturing ductile iron pipes, gray iron pipes and cast steel pipes, but also the yield is high. However, for austenitic stainless steel seamless pipes or nickel-based heat-resistant seamless pipes, a process route of casting, forging, hot extrusion, and cold rolling into pipes is often adopted, and centrifugally cast steel pipes are rarely used as raw material blanks. In practice, austenitic stainless steel seamless tubes or nickel-based heat-resistant seamless tubes can be produced by a process in which a centrifugally cast tube blank is hot extruded into an extruded tube and then cold rolled. The process route is short, and the manufacturing cost is saved. Therefore, the seamless tube rarely adopts a centrifugal blank as a raw material blank, so that the production rhythm of the centrifugal machine cannot meet the smelting production requirement, and the grain size of the centrifugal cast tube blank cannot meet the requirement. Because austenitic stainless steel and nickel-based heat-resistant steel are austenitic structures from high temperature to room temperature, the grain size of the structures cannot be changed through heat treatment, and the grain is refined only through deformation processing such as extrusion, forging, cold rolling and the like, so that the grain size is improved, and the performance of the steel is improved. In order to obtain satisfactory grain size, when cast steel pipes are used as raw material blanks, as the cast crystal grain size of centrifugal cast steel pipe blanks is larger, multiple or large-deformation processing is needed, if the cast crystal grain size of the raw material blanks of the cast steel pipes can be reduced, the grain size is improved, the pressure can be reduced for subsequent processing, and the production cost is saved.

The published patent materials CN109014110A and CN206839085U show vibration mechanisms for vertical centrifugal casting, which are suitable for centrifugal production of small batches of pieces and are not suitable for horizontal centrifugal casting of centrifugal casting steel tubes with large weight of more than several hundred kilograms.

Disclosure of Invention

The utility model provides a technical problem be: an axial vibration centrifuge is provided which can reduce as-cast grains when centrifugally casting an austenite cast steel pipe.

The utility model adopts the technical proposal that: the axial vibration centrifugal machine is matched with a pipe die with a vibration flange in the middle for use, and comprises a driving riding wheel set, a driven riding wheel set and a vibration device positioned between the two riding wheel sets. The vibrating device comprises a rotating wheel device and an eccentric device, the eccentric device comprises an eccentric wheel and a power mechanism for driving the eccentric wheel to rotate, the power mechanism can be a hydraulic motor or an electric motor speed reducer, and an eccentric groove is machined in the eccentric wheel. The rotating wheel device comprises two rotating wheels I, a steel plate and a rotating wheel II; the two rotating wheels I are fixedly arranged on the steel plate, and the distance between the two rotating wheels I corresponds to the width of the vibration flange; the steel plate can only freely move in the axial direction of the pipe die, and the rotating wheel II is installed below the steel plate and matched with the eccentric groove.

The utility model has the advantages that: when the pipe die is used together with a pipe die with a vibration flange, when austenitic stainless steel or nickel-based heat-resistant steel metal liquid is cooled, the cast dendrite can be broken by the axial vibration of the pipe die, the cast crystal grains are reduced, and the pressure is relieved for subsequent deformation processing.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural diagram of a vibration device;

FIG. 3 is a schematic view of an eccentric groove of the eccentric wheel;

FIG. 4 is an as-cast structure of a shock-free austenite cast steel pipe of a pipe die;

FIG. 5 is an as-cast structure of a shock austenite cast steel pipe of a pipe die;

wherein: the device comprises a pipe die 1, a riding wheel group 2, a vibration device 3, a rotating wheel I4, a steel plate 5, a rotating wheel II 6, an eccentric wheel 7, an eccentric groove 8 and a vibration flange 9.

Detailed Description

Fig. 1 is the structure schematic diagram of the axial vibration centrifuge of the present invention, which includes two sets of riding wheel sets 2 and a vibration device 3. The two groups of riding wheel sets are respectively a driving riding wheel set and a driven riding wheel set, the driving riding wheel in the driving riding wheel set drives the pipe die 1 to rotate, and the other driven riding wheels support the pipe die 1 to rotate. The vibration device is arranged between the two groups of riding wheel sets, the structure of the vibration device is shown in the attached figure 2, and the vibration device comprises a rotating wheel device and an eccentric device, wherein the rotating wheel device comprises a rotating wheel I4, a steel plate 5 and a rotating wheel II 6. Distance between two runners I4 is unanimous with the width of the vibrations flange 9 of pipe die 1, and when pipe die 1 was rotatory, vibrations flange 9 drove runner I4 and rotates, and runner I4 fixed mounting is on steel sheet 5, and steel sheet 5 can only freely remove in the direction of pipe die axis, inject the removal of about direction and pipe die about in the upper and lower direction. The rotating wheel II 6 is arranged below the steel plate 5 and is matched with an eccentric groove 8 on the eccentric wheel 7. The eccentric device comprises an eccentric wheel 7 and a power mechanism for driving the eccentric wheel 7 to rotate, the power mechanism can be a hydraulic motor or an electric motor speed reducer, an eccentric groove 8 is machined in the eccentric wheel 7, and the shape and the position of the eccentric groove 8 are shown in figure 3. Eccentric groove 8 cooperatees with II 6 of runner, and when eccentric wheel 7 was rotatory under power unit's drive, eccentric groove 8 made II 6 of runner to remove about producing, and its displacement is the twice of eccentricity, and the removal of II 6 of runner removes to make the runner device drive pipe die 1 and produce vibrations in the axis direction, power unit slew velocity is fast more, and pipe die 1's vibration frequency is high more, and is big more to the destruction degree of dendrite, and the grain size improves better.

By adopting the axial vibration centrifugal machine and the matched pipe die, the axial vibration centrifugal casting method comprises the following steps: 1) baking a pipe die, spraying a coating and installing baffles at two ends of the pipe die; 2) pouring molten metal from one end (namely a pouring end) of the pipe die, and starting a vibration device when the molten metal is filled to the other end (namely a non-pouring end) of the pipe die, so that the pipe die generates axial vibration; 3) and after the molten metal is poured, cooling the pipe die by spraying water, and closing the vibration device when the solidification thickness of the molten metal reaches half of the thickness of the centrifugal casting steel pipe. The shock shutdown time may be determined by simulation, or based on the internal surface temperature of the molten metal as it is centrifuged, or may be determined empirically. 4) And (4) completely solidifying the molten metal, and pushing or pulling the pipe to realize the separation of the cast steel pipe and the pipe die.

The utility model discloses axial vibrations centrifuge uses with the pipe die together, and when austenitic stainless steel or nickel base heat-resisting steel metal liquid cooling, the axial vibrations of pipe die can break as-cast dendrite, improves as-cast structure grain size, lightens pressure for subsequent deformation processing. FIG. 4 shows the as-cast structure of a cast steel pipe when a pipe die of a certain nickel-based alloy is free of vibration, the wall thickness of the cast steel pipe is about 73mm, the length of a dendrite reaches above 45mm, FIG. 5 shows the as-cast structure of the cast steel pipe after the pipe die is vibrated in the axial direction, the wall thickness of the cast steel pipe is about 75mm, the length of the dendrite is about 23mm, and compared with FIG. 4, the length of the dendrite after the pipe die is vibrated in the axial direction is shortened by half, and the grain size is improved obviously.

The axial vibration centrifuge can also be used for producing other centrifugal cast steel pipes, and for cast steel pipes with medium-low carbon content, such as 20Cr or 35CrMo, the centrifuge and the axial vibration casting method can also greatly improve the grain size. The results of the investigation show that the cast steel pipe with medium and low carbon also has the function of inhibiting carbon segregation. Because the content of carbon in austenitic stainless steel or nickel-based heat-resistant steel is very low, the austenitic stainless steel or nickel-based heat-resistant steel has ultralow carbon content, and the carbon segregation is not obvious. The following table shows carbon segregation data of 20Cr and 35CrMo centrifugal cast steel pipes, numbers in a sampling position column in the table show that the cast steel pipes are sampled layer by layer from the inner surface to the outer surface, the cast steel pipes are divided into 12 layers averagely according to the thickness, and carbon analysis is carried out after the layer-by-layer sampling, and the results prove that the maximum value and the difference value of the carbon segregation are obviously reduced after axial vibration, particularly the difference value is reduced by 30-40%, and the axial vibration centrifugal machine and the casting method thereof have good inhibition effect on the carbon segregation of the medium-low carbon cast steel pipes.

Claims

1. The utility model provides an axial vibrations centrifuge, includes initiative riding wheel group and driven riding wheel group, its characterized in that: the device is matched with a pipe die with a vibrating flange (9) in the middle for use; the axial vibration centrifugal machine further comprises a vibration device (3), wherein the vibration device (3) is positioned between the driving idler set and the driven idler set and comprises a rotating wheel device and an eccentric device; the eccentric device comprises an eccentric wheel (7) and a power mechanism for driving the eccentric wheel (7) to rotate, and an eccentric groove (8) is processed on the eccentric wheel (7); the rotating wheel device comprises two rotating wheels I (4), a steel plate (5) and a rotating wheel II (6); the two rotating wheels I (4) are fixedly arranged on the steel plate (5), and the distance between the two rotating wheels I (4) corresponds to the width of the vibration flange (9); the steel plate (5) can only freely move in the axial direction of the pipe die, and the rotating wheel II (6) is installed below the steel plate (5) and matched with the eccentric groove (8).

2. The axially vibrating centrifuge of claim 1, wherein: the power mechanism is a hydraulic motor or an electric motor speed reducer.