Continuous rapid hot pressing sintering device

Abstract

The utility model belongs to the technical field of sintering application, and particularly discloses a continuous type rapid hot pressing sintering device which is composed of an electric cylinder, an upper cross beam, an insulating gasket, a set of conductive copper bars, an automatic powder filling assembly, a middle die assembly, a gravity sensor, two sets of limiting rods, a pressing head fixing base, a lower cross beam, two sets of stand columns and the like. The sintering furnace has the beneficial effects that the sintering time can be remarkably shortened and the sintering efficiency can be improved by combining the effects of high temperature and high pressure, so that the requirement of large-scale production is met; by optimizing the heating and sintering modes, unnecessary energy loss is reduced, the overall energy consumption is reduced, and the current energy-saving and environment-friendly development trend is met; the sintering process can be ensured to be uniform and stable, so that the compactness, strength, wear resistance and other performance indexes of the product are improved; the sintering process is simplified, equipment requirements are reduced, the automation degree of a production line is improved, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sintering application technical field, specifically relates to a continuous quick hot-pressing sintering device. BACKGROUND

[0002] Sintering is a kind of technology that ceramic body is densified at high temperature, and finally forms solid material, and sintering technology plays a vital role in the production process of advanced ceramics.Common sintering methods include normal pressure sintering, hot-pressing sintering, hot isostatic pressing sintering and microwave sintering, among which, hot-pressing sintering is a kind of method widely used at present.

[0003] Hot-pressing sintering is a process that pressure is applied to the powder difficult to sinter in a mold, and the powder is sintered into dense, uniform and fine-grained ceramic material in a short time by heating at the same time.

[0004] According to the different pressure applying methods, the hot-pressing sintering process can be divided into constant pressure method, high-temperature pressure method and segmented pressure method, and according to the sintering method, the hot-pressing sintering process can be divided into vacuum sintering, atmosphere sintering and continuous pressure sintering.

[0005] Compared with other sintering methods, the hot-pressing sintering device has the following advantages: since heating and pressing are carried out at the same time in hot-pressing sintering, the powder is in a hot plastic state, which helps the contact diffusion and flow of particles and the mass transfer process, so the forming pressure is small; the sintering temperature and time can be reduced, thereby resisting grain growth, obtaining products with small grain size, high density, high mechanical properties and high mechanical properties, and producing ultra-high purity ceramic products without adding sintering aids or forming aids.

[0006] At present, the hot-pressing sintering device has the following disadvantages: slow heating speed, high energy consumption and low production efficiency, which limit the further application of the sintering material.

[0007] Based on the above problems, the utility model provides a continuous quick hot-pressing sintering device. UTILITY MODEL CONTENT

[0008] The utility model aims at providing a continuous quick hot-pressing sintering device, which improves the sintering efficiency, reduces energy consumption and improves product quality.

[0009] The utility model discloses a continuous quick hot-pressing sintering device which is composed of an electric cylinder, an upper cross beam, an insulating gasket, a group of conductive copper bars, an automatic powder filling assembly, a middle mold assembly, a gravity sensor, two groups of limiting rods, a pressure head fixing seat, a lower cross beam and two groups of stands.

[0010] The continuous quick hot-pressing sintering device further comprises a sliding belt guide sleeve limiting plate arranged on the two groups of stands and located below the upper cross beam and matched with the upper pressure head.

[0011] The continuous quick hot-pressing sintering device further comprises a group of auxiliary electric cylinders arranged symmetrically on the upper cross beam and located outside the electric cylinder, one end of the group of auxiliary electric cylinders being connected with the outer layer of the floating middle mold respectively.

[0012] The continuous quick hot-pressing sintering device further comprises a material bin connected with the feeding bin.

[0013] The floating middle mold is in an I-shaped structure and made of H13 steel.

[0014] Compared with the prior art, the beneficial effects of the continuous rapid hot-pressing sintering device are that: 1, the traditional sintering device has the problems of slow sintering speed and long cycle, which not only increases the production cost, but also limits the production scale, the structure can significantly shorten the sintering time and improve the sintering efficiency by combining the effects of high temperature and high pressure, thereby meeting the demand of large-scale production; 2, since sintering is a high-energy consumption process, the traditional device needs to consume a large amount of energy, the structure reduces unnecessary energy loss and reduces overall energy consumption by optimizing the heating and sintering mode, which meets the current energy-saving and environment-friendly development trend; 3, the temperature control, pressure application and holding time and other factors in the sintering process have important influence on the quality of the final product, the structure can realize accurate control of these process parameters, ensure uniform and stable sintering process, and improve the density, strength and wear resistance and other performance indicators of the product; 4, the traditional sintering device may have problems such as complex operation, high equipment requirement and high maintenance cost in the production process, the structure simplifies the production process, reduces the equipment requirement and improves the automation degree of the production line, thereby optimizing the entire production process and reducing the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0016] Figure 1 is a front view structural schematic diagram of a continuous rapid hot-pressing sintering device of the present application;

[0017] Figure 2 is a right view structural schematic diagram of a continuous rapid hot-pressing sintering device of the present application;

[0018] Figure 3 is a structural schematic diagram of a middle die assembly of a continuous rapid hot-pressing sintering device of the present application;

[0019] Figure 4 is a structural schematic diagram of an automatic powder filling assembly of a continuous rapid hot-pressing sintering device of the present application;

[0020] Figure 5 is an elevation structural schematic diagram of a continuous rapid hot-pressing sintering device of the present application;

[0021] Figure 6 is a powder sample diagram sintered by a continuous rapid hot-pressing sintering device of the present application;

[0022] The components in the diagram are numbered as follows: 1-Electric cylinder, 2-Upper crossbeam, 3-Blouse, 4-Insulating washer, 5-Auxiliary electric cylinder, 6-Upper pressure head, 7-Conductive copper busbar, 8-Automatic powder filling assembly, 9-Floating middle mold, 10-Lower pressure head, 11-Gravity sensor, 12-Limit rod, 13-Pressure head fixing seat, 14-Lower crossbeam, 15-Insulating sleeve, 16-Powder sample, 17-Alloy mold, 18-Insulating porcelain sleeve, 19-Limit pin, 20-Translation mechanism, 21-Feeding bin, 22-Electric linear module, 23-Column, 24-Sliding guide sleeve limit plate. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0024] In the description of this utility model, it should be noted that the terms "top," "bottom," "one side," "the other side," "front," "back," "middle part," "inner," and "top" are used interchangeably.

[0025] The orientation or positional relationship indicated by terms such as "bottom end" is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The continuous rapid hot pressing sintering device shown consists of an electric cylinder 1, an upper crossbeam 2, an insulating washer 4, a set of conductive copper busbars 7, an automatic powder filling assembly 8, a middle mold assembly, a gravity sensor 11, two sets of limit rods 12, a pressure head fixing seat 13, a lower crossbeam 14, and two sets of columns 23.

[0027] Middle die assembly, including upper punch 6, floating middle die 9, lower punch 10, insulating sleeve 15, alloy die 17 and insulating porcelain sleeve 18;

[0028] Automatic powder filling assembly 8, including a set of limit pins 19, translation mechanism 20, feed bin 21 and electric linear module 22;

[0029] Electric cylinder 1 is arranged on upper cross beam 2,

[0030] Floating middle die 9 is arranged between two groups of vertical columns 23,

[0031] Two ends of two groups of vertical columns 23 are fixedly assembled with upper cross beam 2 and lower cross beam 14 respectively,

[0032] Upper punch 6 is installed on electric cylinder 1,

[0033] Insulating washer 4 is installed on upper punch 6,

[0034] Punch fixing seat 13 is installed on lower cross beam 14,

[0035] Gravity sensor 11 is installed on punch fixing seat 13, and lower punch 10 is installed on gravity sensor 11,

[0036] One end of two groups of limit rods 12 is symmetrically installed on lower cross beam 14 and located outside punch fixing seat 13, and the other end is respectively connected with floating middle die 9 in sliding mode (the other end of two groups of limit rods 12 respectively penetrates floating middle die 9),

[0037] A set of conductive copper bars 7 are respectively connected with upper punch 6 and lower punch 10,

[0038] Alloy die 17 is arranged on floating middle die 9 and located between upper punch 6 and lower punch 10,

[0039] Insulating porcelain sleeve 18 is installed outside alloy die 17,

[0040] Insulating sleeve 15 is installed outside insulating porcelain sleeve 18,

[0041] Electric linear module 22 is arranged on the surface and located on both sides of alloy die 17,

[0042] Feed bin 21 is installed on electric linear module 22,

[0043] Translation mechanism 20 is arranged on both sides of feed bin 21 and cooperates with electric linear module 22,

[0044] A set of limit pins 19 are symmetrically arranged on one end face of electric linear module 22 and cooperates with feed bin 21.

[0045] In addition, the continuous rapid hot-pressing sintering device also comprises a sliding belt guide sleeve limiting plate 24 arranged on the two groups of vertical columns 23 and below the upper cross beam 2 and matched with the upper pressing head 6, wherein the sliding belt guide sleeve limiting plate 24 is used for limiting the upper pressing head 6 in the vertical movement in the horizontal direction.

[0046] In addition, the continuous rapid hot-pressing sintering device also comprises a group of auxiliary electric cylinders 5 arranged symmetrically on the upper cross beam 2 and outside the electric cylinder 1, and one end of the group of auxiliary electric cylinders 5 is connected with the outer layer of the floating middle die 9 respectively, wherein the group of auxiliary electric cylinders 5 is used for assisting the electric cylinder 1 to work, and the pressure is adjusted through fine adjustment, so that the pressure in the pre-pressing and final pressing stages of the sintering process is accurately controlled.

[0047] In addition, the continuous rapid hot-pressing sintering device also comprises a material bin 3 connected with the feeding bin 21, wherein the powder sample 16 is slid into the feeding bin 21 after being put into the material bin 3 and is arranged in the alloy die 17 through the feeding bin 21.

[0048] In addition, the floating middle die 9 is in an I-shaped structure and is made of H13 steel, the gravity sensor 11 monitors the pressure change in the sintering process in real time and feeds back the data to the control system to realize closed-loop control, and the size of the alloy die 17 is 80*55*20 mm.

[0049] The sintering principle of the continuous rapid hot-pressing sintering device is as follows:

[0050] S1, the powder sample 16 (such as ceramic powder) is put into the material bin 3, the electric linear module 22 is used to drive the feeding bin 21 to uniformly fill the powder sample 16 into the alloy die 17 with a size of 80*55*20 mm, and the automatic powder filling assembly 8 can ensure the filling density and uniformity of the powder, so that the quality of the sintered product is improved.

[0051] S2, after the powder sample 16 is filled, the upper pressing head 6 and the lower pressing head 7 are applied with a certain pre-pressing force through the cooperation of the electric cylinder 1 and the group of auxiliary electric cylinders 5, so that the powder sample 16 is initially formed in the alloy die 17 and part of air is discharged, and the pre-pressing can improve the compactness and yield in the sintering process.

[0052] S3, start the heating system (not marked in the figure, which does not affect the disclosure of the technical scheme of the application), through a group of high-efficiency heat conduction elements of conductive copper bar 7, the electric energy is converted into heat energy, which is quickly and uniformly transmitted to the alloy mold 17 and the powder sample 16 in it. The temperature curve should be strictly controlled during heating to ensure that the powder can occur sintering reaction at a suitable temperature; while heating, the electric cylinder 1 and the auxiliary electric cylinder 5 apply continuous pressure to the floating middle mold; the design of the floating middle mold 9 allows it to freely float during sintering according to the thermal expansion characteristics of the powder, thereby ensuring uniform pressure distribution and reducing stress concentration; during hot pressing, the pressure change and sintering state should be closely monitored, and the process parameters should be adjusted in time to obtain the ideal sintering effect; the gravity sensor 11 is used to monitor the equipment to monitor the key parameters of the pressure during sintering; according to the monitoring results, the output of the electric cylinder 1 and the auxiliary electric cylinder 5 and the power of the heating system and other parameters are adjusted in time to maintain the ideal sintering conditions.

[0053] S4, after sintering, the heating system is turned off and the sintered body is naturally cooled in the alloy mold 17. After the powder sample 16 is cooled, the powder sample 16 is automatically demolded when the upper pressure head 6 and the floating middle mold 9 move reversely, and at this time the powder sample 16 is obtained (as shown in Figure 6 ).

[0054] In addition, preferably in S3, the heating system can be set to an automatic program according to different materials to be sintered, with a temperature rising rate of 50-100℃ / min, and a pressure of 30-60MPa is applied to the mold.

[0055] The electric cylinder 1 in the utility model is used as the main power source to drive the lifting movement of the upper pressure head 6 to apply necessary pressure to the sintering material. The upper cross beam 2 is used to support and fix the electric cylinder 1, and the lower cross beam 14 is used to install the pressure head fixing seat, which together with the two groups of vertical columns 23 ensures the stability of the entire pressure transmission system.

[0056] The hopper 3 is used to store the powder sample 16 powder to be sintered, and provides a stable material source for the automatic powder filling assembly 8.

[0057] The insulating washer 4 is installed between the upper pressure head 6 and the upper cross beam 2, which effectively isolates the vibration and heat generated during the operation of the electric cylinder 1, protects the equipment and prevents current leakage.

[0058] A group of conductive copper bars 7 are installed on the upper pressure head 6 and the lower pressure head 10 respectively, which quickly transfers the heat generated by the heating current to the sintering material by utilizing its high thermal conductivity, realizing high-efficiency heat conduction.

[0059] The feeding bin 21 of the automatic powder filling assembly 8 is connected with the hopper, which automatically fills the powder sample 16 powder into the alloy mold 17, reduces manual operation and improves production efficiency.

[0060] The limit pin 19 of the automatic powder filling assembly 8 is used to limit the stroke range of the component, prevent it from exceeding the normal working area, and avoid equipment damage or personal injury. By precisely setting the position of the limit pin 19, it can be ensured that each operation of the equipment is within the predetermined safe and effective range.

[0061] The translation mechanism 20 of the automatic powder filling assembly 8 is the key component for horizontal movement. Under the drive of the electric linear module device, it can drive the feed bin 21 to move accurately in the horizontal direction, realizing the accurate filling of powder.

[0062] The feed bin 21 is the part that stores and supplies powdered materials, located above the translation mechanism 20.

[0063] The electric linear module 22 is responsible for providing the power of linear motion and can realize precise linear displacement under the drive of electrical control signals. The above-mentioned components work together to form a high-efficiency and accurate automatic powder filling device.

[0064] The floating middle die 9 is designed to be floating to adapt to the thermal expansion and contraction of the material during sintering, ensure uniform distribution of pressure, and prevent stress concentration and crack generation.

[0065] Automatic demolding when the upper punch 6 and the floating middle die 9 move reversely, at this time the insulating sleeve 15 and the insulating porcelain sleeve 18 surround the alloy die 17, realizing the insulation between the upper punch 6, the lower punch 10, the alloy die 17 and the floating middle die 9, ensuring electrical insulation and preventing current leakage.

[0066] The limit rod 12 is set between the upper cross beam 2 and the lower cross beam 14 to limit the maximum stroke of the upper punch 6, preventing equipment damage or safety accidents caused by overpressure.

[0067] The punch fixing seat 13 is installed above the lower cross beam 14, used for installing and supporting the upper punch 6, the lower punch 10 and related components.

[0068] The lower cross beam 14 serves as the support base of the entire device, bearing the floating middle die, the gravity sensor and other components, and providing a stable working platform.

[0069] Embodiment: Put the powder sample 16 into the bin, and use the automatic powder filling assembly to uniformly fill the powder sample 16 into the 80*55*20 mm alloy die; the automatic powder filling device can ensure the filling density and uniformity of the powder, thereby improving the quality of the sintered product; after filling the powder, through the cooperation of the electric cylinder and the auxiliary electric cylinder, a certain pre-pressure is applied to the upper punch and the lower punch, so that the powder is initially formed in the die and part of the air is discharged; the pre-pressing can improve the density and yield rate in the sintering process.

[0070] The heating system is started to convert electrical energy into heat energy through efficient heat conduction elements such as conductive copper bars, which quickly and uniformly transfer heat to the alloy mold and the powder sample 16 inside. During the heating process, the temperature curve should be strictly controlled to ensure that the powder can sinter at an appropriate temperature. At the same time of heating, the floating middle mold is subjected to continuous pressure through the electric cylinder and the auxiliary electric cylinder. An automatic program is set to increase the temperature at a rate of 100℃ / min, apply a pressure of 40MPa to the mold, and heat to 980℃, and hold for 10min. After sintering is completed, the heating system is turned off and the sintered body is allowed to cool naturally in the mold. During the cooling process, sharp temperature changes should be avoided to prevent the sintered body from cracking or other defects. After the powder sample 16 cools, the powder sample 16 is automatically demolded when the upper press head and the floating middle mold move in reverse.

[0071] The use of the above device for sintering powder sample 16 materials can achieve continuous rapid hot-pressing sintering of powder sample 16 materials, avoiding energy loss and time waste caused by frequent start-stop of equipment in traditional intermittent production mode, and significantly improving production efficiency. Among them, the design of the floating middle mold allows it to freely float during the sintering process according to the thermal expansion characteristics of the powder, thereby ensuring uniform pressure distribution and reducing stress concentration. During the hot-pressing process, close attention should be paid to the pressure changes and sintering state, and the process parameters should be adjusted in time to obtain the ideal sintering effect. After cooling, the product is demolded and taken out after surface treatment to obtain a dense and excellent performance powder sample 16 bulk material.

[0072] It should be noted that the device uses gravity sensors and other monitoring equipment to monitor key parameters such as pressure and temperature in real time during the sintering process. According to the monitoring results, the output of the electric cylinder and the auxiliary electric cylinder and the power of the heating system are adjusted in time to maintain ideal sintering conditions. The sintered powder sample 16 bulk material has excellent mechanical properties, high durability, and strong corrosion resistance.

[0073] The advantages of this structure are: (1) The middle mold structure is designed to be floating, which can freely float within a certain range to adapt to the expansion and contraction of the material during the sintering process, ensuring the uniformity of the pressure distribution. This design reduces stress concentration caused by material deformation, improving the quality and consistency of the sintered product.

[0074] (2) The middle mold structure is made of high-efficiency heat conduction materials such as conductive copper bars, ensuring that heat can be quickly and uniformly transferred to the sintered bulk material, improving sintering efficiency.

[0075] (3) Unlike traditional devices, this device uses a middle mold left and right power passing method, avoiding the flow of current through the upper press head, floating middle mold, and lower press head of the hydraulic device, reducing energy loss.

[0076] (4) An efficient insulating sleeve and insulating porcelain sleeve are arranged between the upper pressing head, the lower pressing head and the floating middle die, effectively insulating the current and preventing the pressing head from heating due to overcurrent, ensuring the stable operation and safety of the equipment.

[0077] (5) The device is equipped with an automatic powder filling assembly, which can realize automatic filling and uniform distribution of materials, reduce the tediousness and errors of manual operation, and improve the production efficiency and product consistency.

[0078] (6) Through the cooperation of the gravity sensor and the limiting rod, the pressure change and material position during the sintering process can be monitored in real time, precise control is realized, and the stability and reliability of the sintering process are ensured.

[0079] (7) The device adopts a continuous production mode, which can realize continuous and rapid hot-pressing sintering of the sintering split materials, avoiding the energy loss and time waste caused by frequent start-stop of equipment in the traditional intermittent production mode, and significantly improving the production efficiency.

[0080] (8) The continuous production mode also helps to reduce production costs, improve resource utilization and economic benefits.

[0081] It should be noted that in this text, terms such as "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0082] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be considered as limiting the claims involved.

Claims

1. A continuous rapid hot press sintering apparatus, characterized by: The device is composed of an electric cylinder (1), an upper cross beam (2), an insulating gasket (4), a group of conductive copper bars (7), an automatic powder filling assembly (8), a middle mold assembly, a gravity sensor (11), two groups of limiting rods (12), a pressure head fixing seat (13), a lower cross beam (14) and two groups of vertical columns (23). The middle mold assembly comprises an upper pressure head (6), a floating middle mold (9), a lower pressure head (10), an insulating sleeve (15), an alloy mold (17) and an insulating porcelain sleeve (18). The automatic powder filling assembly (8) comprises a group of limiting pins (19), a translation mechanism (20), a feeding bin (21) and an electric linear module (22). The electric cylinder (1) is arranged on the upper cross beam (2), the floating middle mold (9) is arranged in the middle of the two groups of vertical columns (23), the two ends of the two groups of vertical columns (23) are fixedly assembled with the upper cross beam (2) and the lower cross beam (14) respectively, the upper pressure head (6) is installed on the electric cylinder (1), the insulating gasket (4) is installed on the upper pressure head (6), the pressure head fixing seat (13) is installed on the lower cross beam (14), the gravity sensor (11) is installed on the pressure head fixing seat (13), the lower pressure head (10) is installed on the gravity sensor (11), one end of the two groups of limiting rods (12) is symmetrically installed on the lower cross beam (14) and located outside the pressure head fixing seat (13), the other end is slidably connected with the floating middle mold (9), the group of conductive copper bars (7) is connected with the upper pressure head (6) and the lower pressure head (10) respectively, the alloy mold (17) is arranged on the floating middle mold (9) and located between the upper pressure head (6) and the lower pressure head (10), the insulating porcelain sleeve (18) is installed outside the alloy mold (17), the insulating sleeve (15) is installed outside the insulating porcelain sleeve (18), the electric linear module (22) is arranged on the surface and located on both sides of the alloy mold (17), the feeding bin (21) is installed on the electric linear module (22), the feeding bin (21) is provided with the translation mechanism (20) matched with the electric linear module (22) on both sides, and the group of limiting pins (19) is symmetrically arranged on one end face of the electric linear module (22) and matched with the feeding bin (21).

2. The apparatus according to claim 1, wherein: The continuous rapid hot-pressing sintering device further comprises a sliding belt guide sleeve limiting plate (24) arranged on the two groups of vertical columns (23) and located below the upper cross beam (2) and matched with the upper pressure head (6). The sliding belt guide sleeve limiting plate (24) is used for limiting the upper pressure head (6) moving vertically.

3. The apparatus according to claim 2, wherein: Further comprising a group of auxiliary electric cylinders (5) symmetrically arranged on the upper cross beam (2) and located outside the electric cylinder (1), one end of the group of auxiliary electric cylinders (5) is connected with the outer layer of the floating middle mold (9). The group of auxiliary electric cylinders (5) is used for assisting the electric cylinder (1) to work, and the pressure is finely adjusted to ensure the accurate control of the pressure in the pre-pressing and final pressing stages.

4. The apparatus according to claim 3, wherein: Further comprising a material bin (3) connected with the feeding bin (21). The powder sample (16) is slid into the feeding bin (21) after being put into the material bin (3) and arranged in the alloy mold (17) through the feeding bin (21).

5. The apparatus of claim 4, wherein: The floating die (9) is an I-shaped structure, and is made of H13 steel; the gravity sensor (11) monitors the pressure change in the sintering process in real time, and feeds back data to a control system, so as to realize closed-loop control; the alloy die (17) has a size of 80*55*20 mm.

Images