CN115283677A

CN115283677A - Preparation system and preparation method of powder metallurgy part

Info

Publication number: CN115283677A
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: 2022-11-04
Anticipated expiration: 2042-07-27
Also published as: CN115283677B

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, which comprises a control system, a spiral stirrer, an extruding machine, an annealing chamber, a first sintering chamber and a second sintering chamber, wherein the control system is respectively connected with the spiral stirrer, the extruding machine, the annealing chamber, the first sintering chamber and the second sintering chamber, and manages and controls the spiral stirrer, the extruding machine, 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 extruding machine 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 primary sintering and secondary sintering of the annealed green body to obtain 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 powder metallurgy parts.

Background

Powder metallurgy is an industrial technology for preparing metal powder or metal materials, composite materials and various products by using metal powder (or a mixture of metal powder and nonmetal powder) as a raw material and performing forming and sintering. Powder metallurgy technology has been widely used in the fields of transportation, machinery, electronics, aerospace, weapons, biology, new energy, information, nuclear industry, etc., and has become one of the most active branches of new material science. The powder metallurgy technology has a series of advantages of obvious energy saving, 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, which are partially impossible to manufacture by conventional casting and machining methods, can also be manufactured by powder metallurgy, and thus are receiving great attention from the industry.

At present, when preparing powder metallurgy parts through iron base, aluminium base etc. generally including press sintering, the extrusion of blank, forging and pressing shaping, spray deposition, hot isostatic pressing etc. process flow, however when actually preparing powder metallurgy parts, the setting of parameters such as annealing temperature, annealing holding time all sets for according to staff's working experience, because there is artificial participation, cause the error of operation easily, and the preparation method of powder metallurgy parts among the prior art is more single, can not adjust preparation technology according to the actual preparation condition, and then lead to powder metallurgy material surface hardness poor, and anti fatigue degree is low.

Therefore, further improvements to the existing methods of making powder metallurgy parts are needed.

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 in the prior art, 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 order to achieve the above object, the present invention provides a method for producing a powder metallurgy part, the method comprising:

the device comprises a control system, a spiral stirrer, an extruding machine, an annealing chamber, a first sintering chamber and a second sintering chamber, wherein the control system is respectively connected with the spiral stirrer, the extruding machine, 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 extruding machine, 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 extruding machine is used for extruding the mixed powder to obtain part green bodies, the annealing chamber is used for annealing the part green bodies to obtain annealed green bodies, and the first sintering chamber and the second sintering chamber are used for primary sintering and secondary sintering of the annealed green bodies to obtain primary products after secondary sintering;

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

the acquisition module is used for acquiring the working state parameters of the spiral stirrer and the characteristic parameters of the mixed powder, the part green compact and the annealing 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 annealing green compact to the processing module;

the processing module is used for setting working state instructions of the spiral stirrer, the extruding machine, the annealing chamber, the first sintering chamber and the second sintering chamber according to working state parameters of the spiral stirrer and 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 extruding machine, the annealing chamber, the first sintering chamber and the second sintering chamber according to the working state instruction set by the processing module;

in the acquisition 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 green part is the length B of the green part and the diameter C of the green part, and the characteristic parameter of the annealed green part is the weight D of the annealed green part;

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 compact, setting the annealing heat-preservation time of the annealing chamber according to the diameter C of the part green compact, and setting the sintering time of the second sintering chamber according to the weight D of the annealed green compact.

Preferably, in the processing module, when setting the stirring time of the screw mixer based on the stirring speed V of the screw mixer, the processing module specifically includes:

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 more than V3 and more 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 further 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 less than V1, selecting the fourth preset stirring time E4 as the stirring time of the spiral stirrer;

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

when V2 is not less than V and is less than V3, selecting the second preset stirring time E2 as the stirring time of the spiral stirrer;

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

Preferably, the acquisition module is further configured to acquire an additive amount F of the additive and transmit the additive amount F to a processing module, the processing module corrects the stirring time of the screw mixer according to the additive amount F of the additive,

the processing module is used for presetting an additive amount matrix G of additives and 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 greater than G2 and greater 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, more than h2, more than h3, and less than h4, more than 1.2;

the processing module is further used for correcting the stirring time of the spiral stirrer according to the relationship between the additive amount F of the additive and the additive amount of each preset additive when the stirring time of the spiral stirrer is set as the ith preset stirring time Ei, wherein i =1,2,3, 4:

when F is less than G1, selecting the first preset stirring time correction coefficient h1 to correct the ith preset stirring time Ei, wherein the corrected stirring time of the spiral stirrer is Ei x h1;

when G1 is not less than F and less than G2, selecting the second preset stirring time correction coefficient h2 to correct the ith preset stirring time Ei, wherein the corrected stirring time of the spiral stirrer is Ei x h2;

when G2 is not less than F and less than G3, selecting a third preset stirring time correction coefficient h3 to correct the ith preset stirring time Ei, wherein the corrected stirring time of the spiral stirrer is Ei x h3;

and when G3 is not more than F and less than G4, selecting a fourth preset stirring time correction coefficient h4 to correct the ith preset stirring time Ei, wherein the corrected stirring time of the spiral stirrer 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 the mixed powder and setting J (J1, J2, J3, J4), wherein J1 is the surface area of the first preset mixed powder, J2 is the surface area of the second preset mixed powder, J3 is the surface area of the third preset mixed powder, J4 is the surface area of the fourth preset mixed powder, and J1 is more than J2 and more than J3 and less than J4;

the processing module is used for presetting an extrusion pressure matrix K of the extruder and 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 more 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 more 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 more 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 more 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 annealing temperature is set as follows:

the processing module is used for presetting a length matrix L of the part green bodies and 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 the annealing chamber and setting M (M1, M2, M3, 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 more than M3 and more 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 less than L1, selecting the first preset annealing temperature M1 as the annealing temperature of the annealing chamber;

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

when L2 is more 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 the L3 is more 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 holding time of the annealing chamber is set according to the diameter C of the green part, the annealing holding time specifically comprises:

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

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

the processing module is further 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 less than N1, selecting the first preset annealing heat preservation time P1 as the annealing heat preservation time of the annealing chamber;

when N1 is more 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 more 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 the N3 is more than or equal to the C and less than the 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, 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 the target sintering temperature R,

the processing module is used for presetting a temperature difference matrix S and setting S (S1, S2, S3, 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 greater than S2 and is greater than S3 and is greater than S4;

the processing module is used for presetting a valve opening matrix T of the second sintering chamber and setting T (T1, T2, T3, 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 the T1 is not less than R-Q and is less than T2, selecting the second preset valve opening T2 as the valve opening of the second sintering chamber;

when T2 is more 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 the T3 is more 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 the sintering time of the first sintering chamber according to the sintering temperature of the first sintering chamber,

the processing module is used for presetting a sintering temperature matrix X of the first sintering chamber and setting X (X1, X2, X3, 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 more than X3 and more 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 is more than Y3 and is more than Y4;

the processing module is further configured to set the sintering time of the first sintering chamber according to a relationship between the sintering temperature Q of the first sintering chamber and the 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 the X1 is not less than Q and is less than X2, selecting the second preset sintering time Y2 as the sintering time of the first sintering chamber;

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

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

Preferably, in the processing module, when the sintering time of the second sintering chamber is set according to the weight D of the annealed green compact, the method specifically comprises the following steps:

the processing module is used for presetting a weight matrix U of the annealed green bodies and 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 more 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 first preset sintering time, W2 is second preset sintering time, W3 is third preset sintering time, W4 is fourth preset sintering time, and W1 is more than W2 and more than W3 and less than W4;

the processing module is further used for setting the sintering time of the second sintering chamber according to the relation between the weight D of the annealed green body and the weight of each preset annealed green body:

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

when the U1 is more 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 more 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 the U3 is more 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 implemented by adopting a preparation system of the powder metallurgy part, and comprises the following steps:

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

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

step c: controlling the spiral stirrer, the extruding machine, 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 parts;

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 green part is the length B of the green part and the diameter C of the green part, and the characteristic parameter of the annealed green part is the weight D of the annealed green part;

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 holding 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 powder metallurgy parts, and compared with the prior art, the preparation system and the preparation method have the following beneficial effects:

the utility model provides a control system, helical agitator, the extruder, the annealing room, first sintering room and second sintering room, control system respectively with helical agitator, the extruder, the annealing room, first sintering room and second sintering room are connected, and to helical agitator, the extruder, the annealing room, first sintering room and second sintering room are managed and are controlled, helical agitator is used for stirring preparation material and additive and obtains mixed powder, the extruder is used for extrudeing mixed powder and obtains the part unburned bricks, the annealing room is used for carrying out annealing to the part unburned bricks and obtains annealing unburned bricks, first sintering room, the second sintering room is used for carrying out sintering and secondary sintering to annealing unburned bricks, and obtain the primary product after secondary sintering, this application can realize the automated production control of powder metallurgy part, greatly improves production efficiency, the quality of powder metallurgy part has been improved.

Drawings

FIG. 1 shows a functional block diagram of a system for preparing a powder metallurgy part according to an embodiment of the present invention;

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

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

Detailed Description

The following detailed description of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present application, it is to 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 those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

The terms "first", "second" and "first" 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 defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

Throughout the description of the present application, it is to be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.

The following is a description of preferred embodiments of the present invention with reference to the accompanying drawings.

As shown in FIG. 1, an embodiment of the invention discloses a system for preparing a powder metallurgy part, which comprises:

control system, screw mixer, extruder, annealing room, first sintering room and second sintering room, control system respectively with screw mixer, extruder, annealing room, first sintering room and second sintering room are connected, control system is used for right screw mixer, extruder, annealing room, first sintering room and second sintering room manage and control, screw mixer is used for stirring preparation material and additive and obtains mixed powder, the extruder is used for extrudeing mixed powder and obtaining the part unburned bricks, the annealing room is used for carrying out annealing treatment to the part unburned bricks and obtains the annealing unburned bricks, first sintering room, second sintering room are used for carrying out sintering and secondary sintering to the annealing unburned bricks to obtain the primary product after the secondary sintering.

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

The preparation materials can be carbon, copper, nickel, molybdenum, chromium, iron and the like, the additives are a binder and a lubricant, and the phenomenon that the friction force among the materials is too large to influence the mixing effect can be prevented by adding the additives.

As shown in FIG. 2, the invention discloses a schematic structural diagram of a powder metallurgy part preparation system, which comprises a control system (not shown in FIG. 2), a screw mixer 1, an extruder 2, an annealing chamber 3, a first sintering chamber 4 and a second sintering chamber 5, wherein the screw mixer 1, the extruder 2, the annealing chamber 3, the first sintering chamber 4 and the second sintering chamber 5 are respectively connected through a conveyer belt 7, valves 6 are arranged in the first sintering chamber 4 and the second sintering chamber 5, the sintering temperature of the first sintering chamber 4 and the sintering temperature of the second sintering chamber 5 are controlled by adjusting the opening degree of the valves 6, the extruder 2 is connected with the screw mixer 1, the screw mixer 1 is used for mixing preparation materials and additives, and obtaining mixed powder, wherein an extruder 2 is used for extruding the mixed powder in a spiral stirrer to obtain a part green compact and conveying the part green compact to an annealing chamber 3, the annealing chamber 3 is connected to the extruder 2 and is used for annealing the part green compact to obtain an annealed green compact and conveying the annealed green compact to a first sintering chamber 4, the first sintering chamber 4 is connected to the annealing chamber 3, a second sintering chamber 5 is arranged at one end of the first sintering chamber 4, the annealed green compact is pre-sintered in the first sintering chamber 4 and then sintered in the second sintering chamber 5, after sintering in the second sintering chamber 5, a primary product is formed, the primary product is cooled and cooled, and finally, the powder metallurgy part is processed according to the drawing requirements to reach the final size requirement.

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;

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 compact, setting the annealing heat preservation time of the annealing chamber according to the diameter C of the part green compact, and setting the sintering time of the second sintering chamber according to the weight D of the annealing green compact.

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 the stirring time of the screw stirrer is set according to the stirring speed V of the screw stirrer, 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 more 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 more than E3 and more 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:

and when V3 is not less than V and is less than V4, selecting the first preset stirring time E1 as the stirring time of the spiral stirrer.

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

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

when F is less than G1, selecting the first preset stirring time correction coefficient h1 to correct the ith preset stirring time Ei, wherein the stirring time of the spiral stirrer after correction is Ei h1;

when G1 is not more than F and less than G2, selecting the second preset stirring time correction coefficient h2 to correct the ith preset stirring time Ei, wherein the corrected stirring time of the spiral stirrer is Ei h2;

when G2 is not less than F and less than G3, selecting a third preset stirring time correction coefficient h3 to correct the ith preset stirring time Ei, wherein the corrected stirring time of the spiral stirrer is Ei h3;

In the present application, since the additives are the binder and the lubricant, and the friction between the preparation materials can be reduced by adding the binder and the lubricant when the preparation materials are mixed, the accuracy of the stirring time of the screw mixer can be effectively improved by correcting the stirring time of the screw mixer according to the relationship between the addition amount of the additive and the addition amount of each predetermined additive.

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

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

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

In the present application, the larger the surface area of the mixed powder is, the larger the resistance in the extrusion process is, and therefore, by setting the extrusion pressure of the extruder according to the relationship between the surface area a of the mixed powder and the surface area of each predetermined mixed powder, the mixed powder can be sufficiently extruded, and further, a green part having a high fatigue resistance can be obtained, and the densification of the surface of the green part can be 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 green part, specifically:

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

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

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

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 green part, specifically:

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

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

It should be noted that, according to the annealing heat preservation time of the annealing chamber set according to the relation between the diameter of the part green body and the diameter of each preset part green body, the uniformity of the annealed green body can be realized by setting the annealing heat preservation time of the annealing chamber, and the performance of the annealed green body is improved.

In some embodiments of the present application, 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, 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,

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 greater than S2 and is greater than S3 and is greater than S4;

the processing module is used for presetting a valve opening matrix T of the 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;

when the T2 is more 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;

It should be noted that, the pre-sintering refers to a heating process of the annealed green compact at a temperature lower than the final sintering temperature, and the annealed green compact is pre-sintered through the first sintering chamber to improve the strength of the annealed green compact.

In some embodiments of the present application, 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 further used for setting the sintering time of the first sintering chamber according to the relation between the sintering temperature Q of the first sintering chamber and the sintering temperature of each preset first sintering chamber:

and when the X3 is not less than Q and is less than X4, selecting the fourth preset sintering time Y4 as the sintering time of the first sintering chamber.

It should be noted that, when the annealed green compact 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 the sintering time of the first sintering chamber is also lower than that of the second sintering chamber, so the sintering time of the first sintering chamber is set according to the relationship between the sintering temperature Q of the first sintering chamber and the sintering temperatures of the preset first sintering chambers, and the sintering effect on the annealed green compact can be further improved by setting the sintering time of the first sintering chamber.

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

when the U2 is more 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;

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

It should be further noted that after the primary product is prepared, the primary product needs to be cooled, and finally the primary product is precisely processed according to the drawing requirements to reach the final size requirement.

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

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

To sum up, the embodiment of the invention comprises a control system, a screw mixer, an extruding machine, an annealing chamber, a first sintering chamber and a second sintering chamber, wherein the control system is respectively connected with the screw mixer, the extruding machine, the annealing chamber, the first sintering chamber and the second sintering chamber, and manages and controls the screw mixer, the extruding machine, the annealing chamber, the first sintering chamber and the second sintering chamber, the screw mixer is used for mixing preparation materials and additives to obtain mixed powder, the extruding machine 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.

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

While the invention has been described with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the disclosed embodiments of the invention can be used in any combination with one another as long as no structural conflict exists, and all combinations that do not exist are described in this specification solely for the sake of brevity and resource savings. Therefore, it is intended that the invention not be limited to the particular embodiments 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 understand that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement 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 metallurgy part, the system comprising:

2. The system for preparing powder metallurgical parts according to claim 1, wherein in the processing module, when setting the stirring time of the screw stirrer according to the stirring speed V of the screw stirrer, specifically:

when V1 is not less than V and is less than V2, selecting the third preset stirring time E3 as the stirring time of the spiral stirrer;

3. The system for preparing a powder metallurgical part according to claim 2,

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

4. The system for preparing powder metallurgical parts according to claim 1, wherein in the processing module, when setting the extrusion pressure of the extruder according to the surface area a of the mixed powder, specifically:

5. The system for the preparation of powder metallurgical parts according to claim 1, wherein in the treatment module, when setting the annealing temperature of the annealing chamber according to the length B of the green part, in particular:

6. The system for the preparation of powder metallurgical parts according to claim 1, wherein in the treatment module, when setting the annealing holding time of the annealing chamber according to the diameter C of the green part, in particular:

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 bodies and the diameter of each preset part green body:

7. The system for preparing powder metallurgy parts according to claim 1,

the collecting module is further used for collecting 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 the T1 is more 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;

8. The system for preparing a powder metallurgy part according to claim 7,

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

when X2 is not less than Q and less than X3, selecting the third preset sintering time Y3 as the sintering time of the first sintering chamber;

9. The system for preparing powder metallurgical parts according to claim 1, wherein 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:

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

10. A method for producing a powder metallurgical part, which is carried out using the system for producing a powder metallurgical part according to any one of claims 1 to 9, comprising the steps of: