CN115283677B

CN115283677B - Preparation system and preparation method of powder metallurgy part

Info

Publication number: CN115283677B
Application number: CN202210889784.2A
Authority: CN
Inventors: 陈春贤; 杨秀林; 刘春义
Original assignee: Zhejiang Xunda Industrial Technology Co ltd
Current assignee: Zhejiang Xunda Industrial Technology Co ltd
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2024-01-26
Anticipated expiration: 2042-07-27
Also published as: CN115283677A

Abstract

The invention relates to the technical field of powder metallurgy, and discloses a preparation system and a preparation method of a powder metallurgy part, wherein the preparation system comprises a control system, a spiral stirrer, an extruder, an annealing chamber, a first sintering chamber and a second sintering chamber, the control system is respectively connected with the spiral stirrer, the extruder, the annealing chamber, the first sintering chamber and the second sintering chamber, and is used for managing and controlling the spiral stirrer, the extruder, the annealing chamber, the first sintering chamber and the second sintering chamber, the spiral stirrer is used for stirring a preparation material and an additive to obtain mixed powder, the extruder is used for extruding the mixed powder to obtain a part green body, the annealing chamber is used for annealing the part green body to obtain an annealed green body, and the first sintering chamber and the second sintering chamber are used for carrying out primary sintering and secondary sintering on the annealed green body and obtaining a primary product after secondary sintering.

Description

Preparation system and preparation method of powder metallurgy part

Technical Field

The invention relates to the technical field of powder metallurgy, in particular to a preparation system and a preparation method of a powder metallurgy part.

Background

Powder metallurgy is an industrial technique for producing metal powders or producing metal materials, composite materials, and various types of products from metal powders (or a mixture of metal powders and non-metal powders) as raw materials by forming and sintering. The powder metallurgy technology is widely applied to the fields of traffic, machinery, electronics, aerospace, weapons, biology, new energy, information, nuclear industry and the like, and becomes one of the branches with the most development activity in new material science. The powder metallurgy technology has a series of advantages of remarkable energy conservation, material saving, excellent performance, high product precision, good stability and the like, and is very suitable for mass production. In addition, materials and complex parts that cannot be produced in part by conventional casting and machining methods can also be produced by powder metallurgy techniques and are therefore of great importance to the industry.

Currently, when preparing a powder metallurgy part through iron base, aluminum base and the like, the process flows of pressing and sintering, blank extrusion, forging forming, spray deposition, hot isostatic pressing and the like are generally included, however, when the powder metallurgy part is actually prepared, parameters such as annealing temperature, annealing heat preservation time and the like are set according to working experience of workers, errors of operation are easily caused due to manual participation, and the preparation method of the powder metallurgy part in the prior art is single, the preparation process cannot be adjusted according to actual preparation conditions, and therefore, the surface hardness of the powder metallurgy material is poor, and the fatigue resistance degree is low.

Therefore, there is a need for further improvements in the existing methods of manufacturing powder metallurgical parts.

Disclosure of Invention

The embodiment of the invention provides a preparation system and a preparation method of a powder metallurgy part, which are used for solving the technical problems that preparation parameters cannot be adjusted according to actual conditions, the quality of the powder metallurgy part cannot be improved, and the preparation efficiency is low in the prior art.

In order to achieve the above object, the present invention provides a method for manufacturing a powder metallurgy part, the method comprising:

the control system is respectively connected with the spiral stirrer, the extruder, the annealing chamber, the first sintering chamber and the second sintering chamber, and is used for managing and controlling the spiral stirrer, the extruder, the annealing chamber, the first sintering chamber and the second sintering chamber, the spiral stirrer is used for stirring preparation materials and additives and obtaining mixed powder, the extruder is used for extruding the mixed powder and obtaining a part green body, the annealing chamber is used for annealing the part green body and obtaining an annealed green body, and the first sintering chamber and the second sintering chamber are used for carrying out primary sintering and secondary sintering on the annealed green body and obtaining an initial product after secondary sintering;

The control system comprises a processing module, a control module and an acquisition module;

the collecting module is used for collecting the working state parameters of the spiral stirrer and the characteristic parameters of the mixed powder, the part green compact and the annealed green compact, and transmitting the working state parameters of the spiral stirrer and the characteristic parameters of the mixed powder, the part green compact and the annealed green compact to the processing module;

the processing module is used for setting working state instructions of the spiral stirrer, the extruder, the annealing chamber, the first sintering chamber and the second sintering chamber according to the working state parameters of the spiral stirrer and the characteristic parameters of the mixed powder, the part green compact and the annealed green compact;

the control module controls the working states of the spiral stirrer, the extruder, the annealing chamber, the first sintering chamber and the second sintering chamber according to the working state instructions set by the processing module;

in the collecting module, the working state parameter of the spiral stirrer is the stirring speed V of the spiral stirrer, the characteristic parameter of the mixed powder is the surface area A of the mixed powder, the characteristic parameter of the part green compact is the length B of the part green compact and the diameter C of the part green compact, and the characteristic parameter of the annealed green compact is the weight D of the annealed green compact;

The processing module is used for setting the stirring time of the spiral stirrer according to the stirring speed V of the spiral stirrer, setting the extrusion pressure of the extruder according to the surface area A of the mixed powder, setting the annealing temperature of the annealing chamber according to the length B of the part green body, setting the annealing heat-preserving time of the annealing chamber according to the diameter C of the part green body, and setting the sintering time of the second sintering chamber according to the weight D of the annealed green body.

Preferably, in the processing module, when setting the stirring time of the screw mixer according to the stirring speed V of the screw mixer, specifically:

the processing module is used for presetting a stirring speed matrix V0 of the spiral stirrer, and setting V0 (V1, V2, V3 and V4), wherein V1 is a first preset stirring speed, V2 is a second preset stirring speed, V3 is a third preset stirring speed, V4 is a fourth preset stirring speed, and V1 is more than V2 and less than V3 and less than V4;

the processing module is used for presetting a stirring time matrix E of the spiral stirrer and setting E (E1, E2, E3 and E4), wherein E1 is first preset stirring time, E2 is second preset stirring time, E3 is third preset stirring time, E4 is fourth preset stirring time, and E1 is more than E2 and less than E3 and less than E4;

The processing module is also used for setting the stirring time of the spiral stirrer according to the relation between the stirring speed V of the spiral stirrer and the stirring speed of each preset spiral stirrer:

when V is smaller than V1, selecting the fourth preset stirring time E4 as the stirring time of the spiral stirrer;

when V1 is less than or equal to V2, selecting the third preset stirring time E3 as the stirring time of the spiral stirrer;

when V2 is less than or equal to V3, selecting the second preset stirring time E2 as the stirring time of the spiral stirrer;

when V3 is less than or equal to V4, selecting the first preset stirring time E1 as the stirring time of the spiral stirrer.

Preferably, the collecting module is further used for collecting the adding amount F of the additive and transmitting the adding amount F of the additive to the processing module, the processing module corrects the stirring time of the spiral stirrer according to the adding amount F of the additive,

the processing module is used for presetting an additive amount matrix G of an additive, setting G (G1, G2, G3 and G4), wherein G1 is a first preset additive amount, G2 is a second preset additive amount, G3 is a third preset additive amount, G4 is a fourth preset additive amount, and G1 is more than G2 and less than G3 and less than G4;

The processing module is used for presetting a stirring time correction coefficient matrix h of the spiral stirrer and setting h (h 1, h2, h3 and h 4), wherein h1 is a first preset stirring time correction coefficient, h2 is a second preset stirring time correction coefficient, h3 is a third preset stirring time correction coefficient, h4 is a fourth preset stirring time correction coefficient, and h1 is more than 0.8 and less than h2 and h3 is more than 0.2 and less than h4 and less than 1.2;

the processing module is further configured to, when setting the stirring time of the screw mixer to the i-th preset stirring time Ei, correct the stirring time of the screw mixer according to a relationship between the addition amount F of the additive and the addition amounts of the preset additives, where i=1, 2,3, 4:

when F is smaller than G1, the first preset stirring time correction coefficient h1 is selected to correct the ith preset stirring time Ei, and the stirring time of the screw mixer after correction is Ei x h1;

when G1 is less than or equal to F and less than G2, selecting the second preset stirring time correction coefficient h2 to correct the ith preset stirring time Ei, wherein the stirring time of the screw mixer after correction is Ei.h2;

when G2 is less than or equal to F and less than G3, selecting the third preset stirring time correction coefficient h3 to correct the ith preset stirring time Ei, wherein the stirring time of the screw mixer after correction is Ei.h3;

When G3 is less than or equal to F and less than G4, the fourth preset stirring time correction coefficient h4 is selected to correct the ith preset stirring time Ei, and the stirring time of the screw mixer after correction is Ei.h4.

Preferably, in the processing module, when the extrusion pressure of the extruder is set according to the surface area a of the mixed powder, specifically:

the processing module is used for presetting a surface area matrix J of mixed powder, setting J (J1, J2, J3 and J4), wherein J1 is the surface area of first preset mixed powder, J2 is the surface area of second preset mixed powder, J3 is the surface area of third preset mixed powder, J4 is the surface area of fourth preset mixed powder, and J1 is more than J2 and less than J3 and less than J4;

the processing module is used for presetting an extrusion pressure matrix K of the extruder, setting K (K1, K2, K3 and K4), wherein K1 is a first preset extrusion pressure, K2 is a second preset extrusion pressure, K3 is a third preset extrusion pressure, K4 is a fourth preset extrusion pressure, and K1 is more than K2 and less than K3 and less than K4;

the processing module is also used for setting the extrusion pressure of the extruder according to the relation between the surface area A of the mixed powder and the surface area of each preset mixed powder:

when A is less than J1, selecting the first preset extrusion pressure K1 as the extrusion pressure of the extruder;

When J1 is less than or equal to A and less than J2, selecting the second preset extrusion pressure K2 as the extrusion pressure of the extruder;

when J2 is less than or equal to A and less than J3, selecting the third preset extrusion pressure K3 as the extrusion pressure of the extruder;

and when J3 is less than or equal to A and less than J4, selecting the fourth preset extrusion pressure K4 as the extrusion pressure of the extruder.

Preferably, in the processing module, when the annealing temperature of the annealing chamber is set according to the length B of the green part, specifically:

the processing module is used for presetting a length matrix L of a part green body, setting L (L1, L2, L3 and L4), wherein L1 is the length of a first preset part green body, L2 is the length of a second preset part green body, L3 is the length of a third preset part green body, L4 is the length of a fourth preset part green body, and L1 is more than L2 and less than L3 and less than L4;

the processing module is used for presetting an annealing temperature matrix M of an annealing chamber, setting M (M1, M2, M3 and M4), wherein M1 is a first preset annealing temperature, M2 is a second preset annealing temperature, M3 is a third preset annealing temperature, M4 is a fourth preset annealing temperature, and M1 is more than M2 and less than M3 and less than M4;

the processing module is further used for setting the annealing temperature of the annealing chamber according to the relation between the length B of the part green body and the length of each preset part green body:

When B is smaller than L1, selecting the first preset annealing temperature M1 as the annealing temperature of the annealing chamber;

when L1 is less than or equal to B and less than L2, selecting the second preset annealing temperature M2 as the annealing temperature of the annealing chamber;

when L2 is less than or equal to B and less than L3, selecting the third preset annealing temperature M3 as the annealing temperature of the annealing chamber;

and when L3 is less than or equal to B and less than L4, selecting the fourth preset annealing temperature M4 as the annealing temperature of the annealing chamber.

Preferably, in the processing module, when the annealing heat-preserving time of the annealing chamber is set according to the diameter C of the green part, specifically:

the processing module is used for setting N (N1, N2, N3 and N4) of a diameter matrix of the green part of the preset part, wherein N1 is the diameter of the green part of the first preset part, N2 is the diameter of the green part of the second preset part, N3 is the diameter of the green part of the third preset part, N4 is the diameter of the green part of the fourth preset part, and N1 is more than N2 and less than N3 and less than N4;

the processing module is used for presetting an annealing heat-preserving time matrix P of an annealing chamber, and setting P (P1, P2, P3 and P4), wherein P1 is first preset annealing heat-preserving time, P2 is second preset annealing heat-preserving time, P3 is third preset annealing heat-preserving time, P4 is fourth preset annealing heat-preserving time, and P1 is more than P2 and less than P3 and less than P4;

The processing module is also used for setting the annealing heat preservation time of the annealing chamber according to the relation between the diameter C of the part green body and the diameter of each preset part green body:

when C is smaller than N1, selecting the first preset annealing heat preservation time P1 as the annealing heat preservation time of the annealing chamber;

when N1 is less than or equal to C and less than N2, selecting the second preset annealing heat preservation time P2 as the annealing heat preservation time of the annealing chamber;

when N2 is less than or equal to C and less than N3, selecting the third preset annealing heat preservation time P3 as the annealing heat preservation time of the annealing chamber;

and when N3 is less than or equal to C and less than N4, selecting the fourth preset annealing heat preservation time P4 as the annealing heat preservation time of the annealing chamber.

Preferably, the collecting module is further configured to collect the sintering temperature Q of the first sintering chamber, and transmit the sintering temperature Q of the first sintering chamber to the processing module, where the processing module sets the valve opening of the second sintering chamber according to the temperature difference between the sintering temperature Q of the first sintering chamber and the target sintering temperature R,

the processing module is used for presetting a temperature difference matrix S and setting S (S1, S2, S3 and S4), wherein S1 is a first preset temperature difference, S2 is a second preset temperature difference, S3 is a third preset temperature difference, S4 is a fourth preset temperature difference, and S1 is more than S2 and less than S3 and less than S4;

The processing module is used for presetting a valve opening matrix T of a second sintering chamber and setting T (T1, T2, T3 and T4), wherein T1 is a first preset valve opening, T2 is a second preset valve opening, T3 is a third preset valve opening, T4 is a fourth preset valve opening, and T1 is more than T2 and less than T3 and less than T4;

the processing module is further configured to set a valve opening of the second sintering chamber according to a relationship between a temperature difference between the sintering temperature Q of the first sintering chamber and the target sintering temperature R and each preset temperature difference:

when R-Q is more than 0 and less than T1, selecting the first preset valve opening T1 as the valve opening of the second sintering chamber;

when T1 is less than or equal to R-Q and less than T2, selecting the second preset valve opening T2 as the valve opening of the second sintering chamber;

when T2 is less than or equal to R-Q and less than T3, selecting the third preset valve opening T3 as the valve opening of the second sintering chamber;

and when T3 is less than or equal to R-Q and less than T4, selecting the fourth preset valve opening T4 as the valve opening of the second sintering chamber.

Preferably, the processing module further sets a sintering time of the first sintering chamber according to a sintering temperature of the first sintering chamber,

the processing module is used for presetting a sintering temperature matrix X of the first sintering chamber, setting X (X1, X2, X3 and X4), wherein X1 is a first preset sintering temperature, X2 is a second preset sintering temperature, X3 is a third preset sintering temperature, X4 is a fourth preset sintering temperature, and X1 is more than X2 and less than X3 and less than X4;

The processing module is used for presetting a sintering time matrix Y of the first sintering chamber and setting Y (Y1, Y2, Y3 and Y4), wherein Y1 is a first preset sintering time, Y2 is a second preset sintering time, Y3 is a third preset sintering time, Y4 is a fourth preset sintering time, and Y1 is more than Y2 and less than Y3 and less than Y4;

the processing module is further configured to set a sintering time of the first sintering chamber according to a relationship between a sintering temperature Q of the first sintering chamber and a sintering temperature of each preset first sintering chamber:

when Q is less than X1, selecting the first preset sintering time Y1 as the sintering time of the first sintering chamber;

when X1 is less than or equal to Q and less than X2, selecting the second preset sintering time Y2 as the sintering time of the first sintering chamber;

when X2 is less than or equal to Q and less than X3, selecting the third preset sintering time Y3 as the sintering time of the first sintering chamber;

and when X3 is less than or equal to Q and less than X4, selecting the fourth preset sintering time Y4 as the sintering time of the first sintering chamber.

Preferably, in the processing module, when setting the sintering time of the second sintering chamber according to the weight D of the annealed green body, specifically:

the processing module is used for presetting a weight matrix U of an annealed green body, setting U (U1, U2, U3 and U4), wherein U1 is the weight of a first preset annealed green body, U2 is the weight of a second preset annealed green body, U3 is the weight of a third preset annealed green body, U4 is the weight of a fourth preset annealed green body, and U1 is less than U2 and less than U3 and less than U4;

The processing module is used for presetting a sintering time matrix W of the second sintering chamber, and setting W (W1, W2, W3 and W4), wherein W1 is a first preset sintering time, W2 is a second preset sintering time, W3 is a third preset sintering time, W4 is a fourth preset sintering time, and W1 is more than W2 and less than W3 and less than W4;

the processing module is further configured to set a sintering time of the second sintering chamber according to a relationship between the weight D of the annealed green body and the weight of each preset annealed green body:

when D is smaller than U1, selecting the first preset sintering time W1 as the sintering time of the second sintering chamber;

when U1 is less than or equal to D and less than U2, selecting the second preset sintering time W2 as the sintering time of the second sintering chamber;

when U2 is less than or equal to D and less than U3, selecting the third preset sintering time W3 as the sintering time of the second sintering chamber;

and when U3 is less than or equal to D and less than U4, selecting the fourth preset sintering time W4 as the sintering time of the second sintering chamber.

Preferably, the preparation method of the powder metallurgy part is also disclosed, and is implemented by adopting a preparation system of the powder metallurgy part, and comprises the following steps of:

step a: collecting working state parameters of the spiral stirrer and characteristic parameters of the mixed powder, the part green compact and the annealed green compact, and transmitting the working state parameters of the spiral stirrer and the characteristic parameters of the mixed powder, the part green compact and the annealed green compact to the processing module for processing;

Step b: the processing module sets working state instructions of the spiral stirrer, the extruder, the annealing chamber, the first sintering chamber and the second sintering chamber according to the working state parameters of the spiral stirrer and the characteristic parameters of the mixed powder, the part green compact and the annealed green compact;

step c: controlling the spiral stirrer, the extruder, the annealing chamber, the first sintering chamber and the second sintering chamber according to the working state instruction set by the processing module so as to prepare the powder metallurgy part;

in the step a, the working state parameter of the spiral stirrer is the stirring speed V of the spiral stirrer, the characteristic parameter of the mixed powder is the surface area A of the mixed powder, the characteristic parameter of the part green body is the length B of the part green body and the diameter C of the part green body, and the characteristic parameter of the annealed green body is the weight D of the annealed green body;

in the step B, the processing module is configured to set a stirring time of the screw mixer according to a stirring speed V of the screw mixer, set an extrusion pressure of the extruder according to a surface area a of the mixed powder, set an annealing temperature of the annealing chamber according to a length B of the green part, set an annealing heat-preserving time of the annealing chamber according to a diameter C of the green part, and set sintering times of the first sintering chamber and the second sintering chamber according to a weight D of the annealed green part.

The invention provides a preparation system and a preparation method of a powder metallurgy part, which have the following beneficial effects compared with the prior art:

the application includes control system, the screw mixer, the extruder, the annealing room, first sintering room and second sintering room, control system is connected with the screw mixer respectively, the extruder, the annealing room, first sintering room and second sintering room, and to the screw mixer, the extruder, the annealing room, first sintering room and second sintering room manage and control, the screw mixer is used for stirring preparation material and additive and obtains mixed powder, the extruder is used for carrying out the extrusion to mixed powder and obtains the part unburned bricks, the annealing room is used for carrying out annealing treatment to the part unburned bricks and obtains annealed unburned bricks, first sintering room, second sintering room is used for carrying out primary sintering and secondary sintering to the annealed unburned bricks, and obtain the primary product after the secondary sintering, the application can realize the automated production control of powder metallurgy part, greatly improved production efficiency, the quality of powder metallurgy part has been improved.

Drawings

FIG. 1 illustrates a functional block diagram of a system for manufacturing a powder metallurgical part in accordance with an embodiment of the present invention;

FIG. 2 is a schematic diagram of a powder metallurgy part manufacturing system according to an embodiment of the present invention;

FIG. 3 is a schematic flow chart of a method for manufacturing a powder metallurgy part according to an embodiment of the present invention.

Detailed Description

The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.

In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

The following is a description of preferred embodiments of the invention, taken in conjunction with the accompanying drawings.

As shown in fig. 1, an embodiment of the present invention discloses a system for preparing a powder metallurgy part, the system comprising:

the control system is respectively connected with the spiral stirrer, the extruder, the annealing chamber, the first sintering chamber and the second sintering chamber, the control system is used for managing and controlling the spiral stirrer, the extruder, the annealing chamber, the first sintering chamber and the second sintering chamber, the spiral stirrer is used for stirring preparation materials and additives and obtaining mixed powder, the extruder is used for extruding the mixed powder and obtaining part green bodies, the annealing chamber is used for carrying out annealing treatment on the part green bodies and obtaining annealed green bodies, and the first sintering chamber and the second sintering chamber are used for carrying out primary sintering and secondary sintering on the annealed green bodies and obtaining primary products after secondary sintering.

The control system is communicated with the spiral stirrer, the extruder, the annealing chamber, the first sintering chamber and the second sintering chamber through data lines, so that the spiral stirrer, the extruder, the annealing chamber, the first sintering chamber and the second sintering chamber are managed and controlled through the control system, and the spiral stirrer, the extruder, the annealing chamber, the first sintering chamber and the second sintering chamber are respectively connected through conveying belts, so that automatic production of powder metallurgy parts is realized.

It should be noted that the preparation materials may be carbon, copper, nickel, molybdenum, chromium, iron, etc., and the additives may be binders and lubricants, and the phenomenon that the mixing effect is affected due to excessive friction force between the materials can be prevented by adding the additives.

As shown in fig. 2, the invention discloses a structural schematic diagram of a preparation system of a powder metallurgy part, which comprises a control system (not shown in fig. 2), a spiral stirrer 1, an extruder 2, an annealing chamber 3, a first sintering chamber 4 and a second sintering chamber 5, wherein the spiral stirrer 1, the extruder 2, the annealing chamber 3, the first sintering chamber 4 and the second sintering chamber 5 are respectively connected through a conveying belt 7, a valve 6 is arranged in the first sintering chamber 4 and the second sintering chamber 5, the sintering temperature of the first sintering chamber 4 and the second sintering chamber 5 is controlled by adjusting the opening degree of the valve 6, wherein the extruder 2 is connected to the spiral stirrer 1, the spiral stirrer 1 is used for mixing preparation materials and additives to obtain mixed powder, the extruder 2 is used for extruding the mixed powder in the spiral stirrer to obtain a part green compact and conveying the part to the annealing chamber 3, the annealing chamber 3 is connected to the extruder 2, the part green compact is annealed to obtain annealed and conveyed to the first sintering chamber 4, the first sintering chamber 4 is connected to the annealing chamber 3, the second sintering chamber 5 is arranged in the annealing chamber 4, the sintering chamber 5 is sintered in the first sintering chamber 4, the first sintering chamber is sintered green compact is cooled in the first sintering chamber 4, the green compact is sintered in the first sintering chamber, the green compact is cooled down to reach the required size, and finally, the green compact is sintered in the first sintering chamber, and the green compact is cooled to reach the required size, and finally, the primary green compact is sintered, and the primary compact is cooled, and finally, and the primary green compact is sintered.

With continued reference to fig. 1, in some embodiments of the present application, the control system includes a processing module, a control module, and an acquisition module;

It should be noted that, this application can realize the automated production control of powder metallurgy part, has greatly improved production efficiency, has improved the quality of powder metallurgy part.

In some embodiments of the present application, in the processing module, when setting the stirring time of the screw mixer according to the stirring speed V of the screw mixer, specifically:

In the actual production, if the stirring time of the screw mixer is short, the material cannot be uniformly stirred, and if the stirring effect is not ideal, segregation and re-separation may occur due to electrostatic effects such as diffusion, convection, friction, etc. of the material if the stirring time is too long. The processing module in this application sets for the stirring time of screw mixer according to the stirring speed V of screw mixer and each relation between the stirring speed of predetermineeing screw mixer, can realize the accurate control to screw mixer stirring time.

In some embodiments of the present application, the collection module is further configured to collect an amount F of the additive and transmit the amount F of the additive to a processing module, the processing module corrects a stirring time of the screw mixer according to the amount F of the additive,

It should be noted that, the additive in the present application is a binder and a lubricant, and when the preparation materials are mixed, friction between the preparation materials can be reduced by adding the binder and the lubricant, so that the stirring time of the screw mixer is corrected according to the relation between the addition amount of the additive and the addition amount of each preset additive in the present application, and the accuracy of the stirring time of the screw mixer can be effectively improved.

In some embodiments of the present application, in the processing module, when the extrusion pressure of the extruder is set according to the surface area a of the mixed powder, specifically:

In the actual preparation process, the larger the surface area of the mixed powder is, the larger the resistance in the extrusion process is, so that the extrusion pressure of the extruder is set according to the relation between the surface area A of the mixed powder and the surface area of each preset mixed powder in the application, the mixed powder can be fully extruded, and further, the part green compact with higher fatigue resistance degree is obtained, and the densification of the surface of the part green compact is realized.

In some embodiments of the present application, in the processing module, when the annealing temperature of the annealing chamber is set according to the length B of the part green body, specifically:

In the application, the annealing temperature of the annealing chamber is set according to the relation between the length of the part green body and the length of each preset part green body, the part green body is annealed, and oxide films on the surface of the part green body, gas and moisture impurities on the surface of the part green body and the problem of work hardening of the part green body can be effectively removed by controlling the annealing temperature of the part green body.

In some embodiments of the present application, in the processing module, when setting the annealing holding time of the annealing chamber according to the diameter C of the part green body, specifically:

It should be noted that, this application sets for annealing heat preservation time of annealing room according to the relation between the diameter of part unburned bricks and the diameter of each presettings part unburned bricks, can realize annealing unburned bricks's homogeneity through setting for annealing heat preservation time of annealing room, improves annealing unburned bricks's performance.

In some embodiments of the present application, the collection module is further configured to collect the sintering temperature Q of the first sintering chamber, and transmit the sintering temperature Q of the first sintering chamber to the processing module, the processing module sets the valve opening of the second sintering chamber according to a temperature difference between the sintering temperature Q of the first sintering chamber and a target sintering temperature R,

It should be noted that presintering refers to heat treatment of an annealed green body at a temperature lower than a final sintering temperature, and presintering is performed on the annealed green body through a first sintering chamber to improve strength of the annealed green body, and by setting a valve opening of a second sintering chamber according to a relationship between a temperature difference between a sintering temperature of the first sintering chamber and a target sintering temperature and each preset temperature difference in the present application, the temperature of the second sintering chamber can be effectively controlled, and further strength of the annealed green body is improved, and cracking phenomenon of the annealed green body is prevented.

In some embodiments of the present application, the processing module further sets a sintering time of the first sintering chamber based on a sintering temperature of the first sintering chamber,

When the annealed green body is pre-sintered in the first sintering chamber, the sintering temperature of the first sintering chamber is lower than that of the second sintering chamber, and meanwhile, the sintering time of the first sintering chamber is also lower than that of the second sintering chamber.

In some embodiments of the present application, in the processing module, when setting the sintering time of the second sintering chamber according to the weight D of the annealed green body, specifically:

It should be noted that the length of the sintering time is an important factor affecting sintering, and the sintering time is too long or too short to bring certain defects to the annealed green body, so that the sintering time of the second sintering chamber is set according to the relation between the weight of the annealed green body and the weight of each preset annealed green body, and the initial product with higher performance can be prepared by setting the sintering time of the second sintering chamber according to the weight of the annealed green body, so that the problem of unnecessary defects of the initial product is avoided.

It should be noted that after the primary product is obtained, the primary product is cooled, and finally the primary product is processed finely according to the drawing requirement to reach the final size requirement.

As shown in fig. 3, the present application also discloses a method for preparing a powder metallurgy part, where the method is implemented by using a preparation system of the powder metallurgy part, and includes the following steps:

In summary, the embodiment of the invention comprises a control system, a spiral stirrer, an extruder, an annealing chamber, a first sintering chamber and a second sintering chamber, wherein the control system is respectively connected with the spiral stirrer, the extruder, the annealing chamber, the first sintering chamber and the second sintering chamber, manages and controls the spiral stirrer, the extruder, the annealing chamber, the first sintering chamber and the second sintering chamber, the spiral stirrer is used for stirring preparation materials and additives to obtain mixed powder, the extruder is used for extruding the mixed powder to obtain a part green body, the annealing chamber is used for annealing the part green body to obtain an annealed green body, and the first sintering chamber and the second sintering chamber are used for carrying out primary sintering and secondary sintering on the annealed green body to obtain a primary product.

In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

Although the invention has been described hereinabove with reference to embodiments, various modifications thereof may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the features of the disclosed embodiments may be combined with each other in any manner as long as there is no structural conflict, and the entire description of these combinations is not made in the present specification merely for the sake of omitting the descriptions and saving resources. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Those of ordinary skill in the art will appreciate that: the above is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that the present invention is described in detail with reference to the foregoing embodiments, and modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A system for preparing a powder metallurgical part, the system comprising:

the processing module is used for setting the stirring time of the spiral stirrer according to the stirring speed V of the spiral stirrer, setting the extrusion pressure of the extruder according to the surface area A of the mixed powder, setting the annealing temperature of the annealing chamber according to the length B of the part green body, setting the annealing heat-preserving time of the annealing chamber according to the diameter C of the part green body and setting the sintering time of the second sintering chamber according to the weight D of the annealed green body;

In the processing module, when setting the stirring time of the screw mixer according to the stirring speed V of the screw mixer, specifically:

when V3 is less than or equal to V4, selecting the first preset stirring time E1 as the stirring time of the spiral stirrer;

the acquisition module is also used for acquiring the addition quantity F of the additive and transmitting the addition quantity F of the additive to the processing module, the processing module corrects the stirring time of the spiral stirrer according to the addition quantity F of the additive,

when G3 is less than or equal to F and less than G4, selecting the fourth preset stirring time correction coefficient h4 to correct the ith preset stirring time Ei, wherein the stirring time of the screw mixer after correction is Ei.h4;

in the processing module, when the extrusion pressure of the extruder is set according to the surface area a of the mixed powder, specifically:

when J3 is less than or equal to A and less than J4, selecting the fourth preset extrusion pressure K4 as the extrusion pressure of the extruder;

in the processing module, when the annealing temperature of the annealing chamber is set according to the length B of the part green body, the annealing temperature is specifically as follows:

when L3 is less than or equal to B and less than L4, selecting the fourth preset annealing temperature M4 as the annealing temperature of the annealing chamber;

in the processing module, when the annealing heat-preserving time of the annealing chamber is set according to the diameter C of the part green body, the annealing heat-preserving time is specifically as follows:

when N3 is less than or equal to C and less than N4, the fourth preset annealing heat preservation time P4 is selected as the annealing heat preservation time of the annealing chamber;

the acquisition module is also used for acquiring the sintering temperature Q of the first sintering chamber and transmitting the sintering temperature Q of the first sintering chamber to the processing module, the processing module sets the valve opening of the second sintering chamber according to the temperature difference between the sintering temperature Q of the first sintering chamber and the target sintering temperature R,

When T3 is less than or equal to R-Q and less than T4, selecting the fourth preset valve opening T4 as the valve opening of the second sintering chamber;

the processing module also sets a sintering time of the first sintering chamber according to a sintering temperature of the first sintering chamber,

when X3 is less than or equal to Q and less than X4, selecting the fourth preset sintering time Y4 as the sintering time of the first sintering chamber;

in the processing module, when setting the sintering time of the second sintering chamber according to the weight D of the annealed green body, specifically:

2. A method of manufacturing a powder metallurgical part, the method being performed using the powder metallurgical part manufacturing system of claim 1, comprising the steps of:

in the step B, the processing module is used for setting the stirring time of the spiral stirrer according to the stirring speed V of the spiral stirrer, setting the extrusion pressure of the extruder according to the surface area A of the mixed powder, setting the annealing temperature of the annealing chamber according to the length B of the part green body, setting the annealing heat-preserving time of the annealing chamber according to the diameter C of the part green body, and setting the sintering time of the first sintering chamber and the second sintering chamber according to the weight D of the annealed green body;