CN114799066B

CN114799066B - Alloy test bar manufacturing method and equipment

Info

Publication number: CN114799066B
Application number: CN202210395452.9A
Authority: CN
Inventors: 吴闯; 彭伟平; 王超; 张娜娜; 李建立
Original assignee: Jiangsu Qina New Material Technology Co ltd
Current assignee: Jiangsu Qina New Material Technology Co ltd
Priority date: 2022-04-14
Filing date: 2022-04-14
Publication date: 2023-06-27
Anticipated expiration: 2042-04-14
Also published as: CN114799066A

Abstract

The invention provides a manufacturing method of an alloy test bar, which comprises the steps of spraying a release agent on the inner wall of a metal mold to form a protective film; assembling a metal mold and carrying out external reinforcement; heating the metal mold to a baking temperature, and waiting for casting alloy liquid; pouring alloy liquid into a pouring opening of the metal mold until the alloy liquid fully fills the interior of the metal mold; and (5) removing the die after the alloy liquid is cooled, taking out the test bar and processing. The invention also provides alloy test bar manufacturing equipment which comprises a body component, a pouring channel and a test bar casting blank cavity. The alloy test bar manufacturing method and the device solve the problems that the die in the existing test bar manufacturing process can not be reused and is easy to deform, and the quality and mechanical property of the manufactured test bar are improved.

Description

Alloy test bar manufacturing method and equipment

Technical Field

The invention relates to the technical field of high-temperature alloy test bar manufacturing, in particular to an alloy test bar manufacturing method and equipment.

Background

Silica sol test bar forms are commonly used for manufacturing alloy test bars: the test bar manufactured through the mould shell mould is mainly used for detecting the performance of alloy materials. The method comprises the steps of firstly preparing a test bar wax mould and a runner wax mould, then welding and assembling the test bar wax mould and the runner wax mould, secondly performing slurry rinsing and shell making on the spliced wax mould for multiple times, and finally baking, dewaxing and solidifying to produce the test bar made of the high-temperature alloy material. The mould generally adopts a cage structure, and the molten alloy is poured into a cage type test bar mould shell, after the molten alloy is cooled, the mould shell on the surface is removed, then the casting blank is divided, and the casting system and other parts are cut off to obtain the test bar product.

The test bar manufactured by the mould shell mould has complex production process and high requirements on the manufacturing process and splicing environment. Because the wax mould of the test stick is thinner, the wax mould is easy to deform and bend in the processes of demoulding and rinsing pulp, and the cast test stick can be unqualified and cannot be used; the mould shell mould can only be used once and can not be reused, and the production cost of the mould is high; the quenching effect of the mould shell test bar mould on the casting molten steel is weak, and the internal structure crystal grains of the test bar are coarse and uneven; the casting method is vertical casting, and the exhaust and slag discharging capability is insufficient, and the cast test bar has casting defects such as slag inclusion, cold insulation, air holes and the like, so that the performance detection result of the alloy test bar product is affected.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect of insufficient performance of the test bar made of the wax mould in the prior art, thereby providing a method and equipment for manufacturing the alloy test bar.

In order to solve the technical problems, the invention provides a manufacturing method of an alloy test bar, which comprises the following steps

Spraying a release agent on the inner wall of the metal mold to form a protective film;

assembling a metal mold and carrying out external reinforcement;

heating the metal mold to a baking temperature, and waiting for casting alloy liquid;

pouring alloy liquid into a pouring opening of the metal mold until the alloy liquid fully fills the interior of the metal mold;

and (5) removing the die after the alloy liquid is cooled, taking out the test bar and processing.

As a preferable scheme of the alloy test bar manufacturing method, the invention comprises the following steps: the release agent is boron nitride coating and is prepared by mixing hexagonal boron nitride powder and industrial ethanol.

As a preferable scheme of the alloy test bar manufacturing method, the invention comprises the following steps: the mixing ratio of the hexagonal boron nitride powder to the industrial ethanol is 1: and 5, uniformly spraying the boron nitride coating on the inner wall of the metal by adopting a spray gun to form a ceramic protective film.

As a preferable scheme of the alloy test bar manufacturing method, the invention comprises the following steps: the baking temperature is 500+/-20 ℃, and the baking time is more than or equal to 2 hours.

As a preferable scheme of the alloy test bar manufacturing method, the invention comprises the following steps: after the alloy liquid is poured from the pouring opening, the alloy liquid passes through the slag blocking channel and rises from the bottom to the inside of the test rod casting blank.

The invention also provides alloy test bar manufacturing equipment, which comprises,

the body assembly comprises a left module and a right module which are symmetrically arranged;

the pouring channel is arranged in the body assembly and comprises a pouring opening and a pouring cavity;

and the test bar blank casting cavity is arranged in the body assembly and is connected with the casting channel.

As a preferable scheme of the alloy test bar manufacturing equipment, the invention comprises the following steps: the pouring channel and the test bar blank casting cavity are arranged on the butt joint surface of the left module and the right module, and the butt joint surface is also provided with a positioning pin and a positioning hole.

As a preferable scheme of the alloy test bar manufacturing equipment, the invention comprises the following steps: and a slag blocking channel is further connected between the pouring channel and the test bar casting blank cavity and is communicated with the bottom of the test bar casting blank cavity.

As a preferable scheme of the alloy test bar manufacturing equipment, the invention comprises the following steps: the slag blocking channel comprises an indwelling channel and an overflow channel, the indwelling channel is communicated with the bottom of the pouring cavity, and the overflow channel is higher than the indwelling channel and is communicated with the embryo casting cavity of the test rod.

As a preferable scheme of the alloy test bar manufacturing equipment, the invention comprises the following steps: an overflow port is arranged between the test bar blank casting cavity and the overflow channel, and two overflow ports are arranged up and down; and a feeding head is arranged at the top of the test bar blank casting cavity.

The technical scheme of the invention has the following advantages:

1. according to the method for manufacturing the alloy test bar, the coating agent is sprayed on the inner wall before die assembly, so that the ceramic protective film is formed on the surface of the inner cavity of the test bar die, casting scouring damage of the alloy liquid to the die is reduced, and the surface finish quality of the test bar is improved. Meanwhile, the metal mold is matched with external fixation, so that deformation of blanks of the production test bars can be reduced, machining and turning are facilitated, and finally the purposes of improving the high purity and the tensile property of the cast test bars are achieved.

2. According to the method for manufacturing the alloy test bar, the mold release agent adopts the boron nitride coating, so that the mold can be protected from corrosion, the service life of the refractory material is prolonged, fine impurities are prevented from penetrating into the molten metal to cause secondary pollution, and the quality of the test bar is greatly improved. Meanwhile, the boron nitride coating still protects the special lubricity and non-stick property at extremely high temperature, ensures smooth flow in the casting process of alloy liquid, and prevents defects such as cold insulation and the like.

3. According to the method for manufacturing the alloy test bar, the die is heated to the baking temperature in the heating stage before the alloy liquid is poured, so that the temperature difference between the die and the alloy liquid is reduced, the alloy liquid is prevented from being cooled and solidified prematurely, the fluidity of the alloy liquid in the metal die is enhanced, and defects such as cold insulation, air holes and the like are avoided. Meanwhile, after preheating for 2 hours, water vapor in the metal mold is basically removed, the situation that alloy liquid splashes due to water vapor during pouring is avoided, the surface smoothness of the test bar is finally ensured, and the performance of the test bar is improved.

4. According to the method for manufacturing the alloy test rod, the alloy liquid rises from the bottom to the inside of the test rod casting blank, the casting sequence of casting the alloy liquid from the bottom to the top is realized, and the gas and slag inclusion in the alloy liquid can be effectively discharged by matching with the feeding riser, so that the defect of insufficient exhaust and slag inclusion capacity in vertical casting is overcome.

5. The alloy test bar manufacturing equipment provided by the invention adopts the body component made of metal, and the pouring channel and the test bar casting blank cavity are formed in the module, so that the repeated use of the die is realized, the manufacturing cost of the test bar die is reduced, and the production procedures of the die are reduced. Meanwhile, by utilizing the characteristic of strong metal heat conductivity, the rapid quenching of the alloy liquid entering the die can be realized, the problem of refining of test bar grains is solved, and the density of the alloy test bar is improved.

6. According to the alloy test rod manufacturing equipment provided by the invention, the slag blocking channel is further connected between the pouring channel and the test rod casting blank cavity, the slag blocking channel is communicated with the bottom of the test rod casting blank cavity, after alloy liquid is injected into the pouring channel, the alloy liquid reaches the bottom of the slag blocking channel, and then the casting sequence is carried out in an upturned mode through the overflow channel, so that gas and slag inclusion in molten steel are removed, and the purity of the alloy test rod is improved.

7. According to the alloy test rod manufacturing equipment provided by the invention, two overflow ports are arranged between the test rod casting blank cavity and the overflow channel, so that in the process of rising of alloy liquid, air at the upper part in the slag blocking channel and the test rod casting blank cavity can be discharged at the same time, the purity of the alloy test rod is improved, and the mechanical property of the test rod is further improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic perspective view of an alloy test rod making apparatus;

FIG. 2 is a schematic plan view of the interior of the body assembly;

FIG. 3 is a side cross-sectional view of an alloy test bar manufacturing apparatus;

FIG. 4 is a schematic diagram of a casting flow process of alloy liquid;

FIG. 5 is a golden phase diagram of a test stick.

Reference numerals illustrate:

100. a body assembly; 200. a pouring channel; 300. a test bar blank casting cavity; 400. a slag blocking channel;

101. a left module; 102. a right module; 103. a hinge shaft; 104a, locating pins; 104b, positioning holes; 105. die lifting opening

201. A sprue gate; 202. pouring channel;

301. feeding riser;

401. a retention channel; 402. an overflow channel; 402a, overflow port;

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying 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 thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, 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 above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.

Example 1

The embodiment provides a method for manufacturing an alloy test bar, which comprises the following steps of

assembling a metal mold and carrying out external reinforcement;

According to the manufacturing method of the alloy test bar, the coating agent is sprayed on the inner wall before die assembly, so that the ceramic protective film is formed on the surface of the inner cavity of the test bar die, casting scouring damage of the alloy liquid to the die is reduced, and the surface finish quality of the test bar is improved. Meanwhile, the metal mold is matched with external fixation, so that deformation of blanks of the production test bars can be reduced, machining and turning are facilitated, and finally the purposes of improving the high purity and the tensile property of the cast test bars are achieved.

Specifically, the release agent in this embodiment is a boron nitride coating, and is prepared by mixing hexagonal boron nitride powder and industrial ethanol. Wherein, the mixing proportion of the hexagonal boron nitride powder and the industrial ethanol alcohol is 1: and 5, uniformly spraying the boron nitride coating on the inner wall of the metal by adopting a spray gun to form a ceramic protective film.

The mold agent in the implementation adopts the boron nitride coating, can protect the mold from corrosion, prolong the service life of refractory materials, prevent fine impurities from penetrating into molten metal to cause secondary pollution, and greatly improve the quality of test bars. Meanwhile, the boron nitride coating still protects the special lubricity and non-stick property at extremely high temperature, ensures smooth flow in the casting process of alloy liquid, and prevents defects such as cold insulation and the like.

The outer fixing of the metal mould in the embodiment adopts the bow clamp for reinforcement, so that the occurrence of expansion of the box during casting is prevented.

Hanging the metal mold after mold closing into a special iron box, and sending into a baking furnace for baking at the temperature: and (3) lifting the baked mould into a casting platform in a furnace to wait for casting before smelting the test rod at 500+/-20 ℃ for more than or equal to 2 hours.

And in the heating stage before casting the alloy liquid, the die is heated to a baking temperature, so that the temperature difference between the die and the alloy liquid is reduced, the alloy liquid is prevented from being cooled and solidified prematurely, the fluidity of the alloy liquid in the metal die is enhanced, and the defects of cold insulation, air holes and the like are avoided. Meanwhile, after preheating for 2 hours, water vapor in the metal mold is basically removed, the situation that alloy liquid splashes due to water vapor during pouring is avoided, the surface smoothness of the test bar is finally ensured, and the performance of the test bar is improved.

When the alloy liquid is poured, the melted alloy liquid is poured into the metal cavity along the pouring opening in the center of the die, the casting is stopped until the alloy liquid flows to the upper parts of feeding heads at the two ends, and the die is lifted out of the furnace after the alloy liquid is cooled.

The alloy liquid in the embodiment rises from the bottom to the inside of the test rod casting blank, the casting sequence of casting the alloy liquid from the bottom to the top is realized, and the gas and slag inclusion in the alloy liquid can be effectively discharged by matching with the feeding head, so that the defect of insufficient exhaust and slag discharge capability in vertical casting is overcome.

And after the pouring is finished, the bow-shaped clamp is disassembled, the left and right dies of the test bar die are opened, and the alloy test bar casting blank is taken out. And manually cutting off redundant alloy pouring passageway materials, and using the rest of the cast blanks of the test bar body for tensile test.

The metal mold used in this example reduces the production of cast solid waste compared with the same type of mold, reducing environmental pollution. Meanwhile, the deformation of the blank of the production test bar is reduced, the machining and turning are convenient, and the casting precision of the test bar is improved.

Because the body component made of metal is adopted, the pouring channel and the test bar casting blank cavity are formed in the module, the repeated use of the die is realized, the manufacturing cost of the test bar die is reduced, and the production procedures of the die are reduced. Meanwhile, by utilizing the characteristic of strong metal heat conductivity, the rapid quenching of the alloy liquid entering the die can be realized, the problem of refining of test bar grains is solved, and the density of the alloy test bar is improved.

As shown in the following table, the mechanical properties of the test bars manufactured by the manufacturing method in this example were compared with those of the test bars manufactured by the conventional method.

As can be seen from the table above, the test bars manufactured by the manufacturing method in the embodiment have higher tensile strength than the test bars manufactured by common sand casting, the yield strength is improved, and the elastic deformation capability is improved. The elongation and shrinkage are further improved.

Example 2

The present embodiment provides an alloy test bar manufacturing apparatus, whose structure is shown in fig. 1, including a body assembly 100, a pouring channel 200, and a test bar casting cavity 300. Wherein the body assembly 100 includes a left module 101 and a right module 102 symmetrically disposed. The pouring channel 200 is formed in the body assembly 100 and comprises a pouring gate 201 and a pouring cavity, and is used for providing an inlet when pouring alloy liquid, so as to realize vertical pouring. The bar casting cavity 300 is disposed in the body assembly 100 and connected to the casting channel 200 for forming the bar.

In this embodiment, the body component 100 made of metal is used to mold the pouring channel 200 and the blank casting cavity 300 of the test bar inside the module, so as to realize the reuse of the mold, reduce the manufacturing cost of the test bar mold and reduce the production procedures of the mold. Meanwhile, by utilizing the characteristic of strong metal heat conductivity, the rapid quenching of the alloy liquid entering the die can be realized, the problem of refining of test bar grains is solved, and the density of the alloy test bar is improved.

As shown in fig. 5, the left side is a gold phase diagram of a test bar manufactured by the manufacturing equipment in the embodiment, and the right side is a gold phase diagram of a test bar of a common sand casting device, so that it can be obviously seen that the test bar in the embodiment has smaller crystal grains, and the indexes such as tensile strength, yield strength and the like are improved in terms of mechanical properties, and the elasticity is improved.

Preferably, the body assembly 100 in this embodiment is manufactured by machining (CNC) two gray cast iron CHT1 square billets, and is divided into a left die and a right die, the test bars on each test bar die cavity are symmetrically distributed along the center line of the gate, and the bottoms of the two dies are connected by adopting a structure of a hinge shaft 103, so that rapid die assembly and die opening can be realized, and 2 test bar finished products can be produced at one time. The size of the assembled die is precisely controlled by the two positioning pins 104a, so that the butt joint of the die assembly blank is ensured to be tidy.

Specifically, as shown in fig. 1 and 2, the pouring channel 200 and the blank cavity 300 of the test bar in this embodiment are opened on the joining surface of the left module 101 and the right module 102, and the joining surface is further provided with a positioning pin 104a and a positioning hole 104b, and the size of the assembled mold is precisely controlled by the two positioning pins 104a, so as to ensure that the joint of the mold closing blank is neat. In order to facilitate mold opening and closing, mold lifting ports 105 are provided on the side portions of the left and right mold blocks 101 and 102, respectively.

As shown in fig. 2 and 3, the pouring gate 201 in this embodiment is a conical opening formed at the top of the body assembly 100, which facilitates the inflow of the alloy liquid, prevents the blockage, and the pouring channel 202 is vertically arranged, so that the alloy liquid reaches the bottom and then turns up into the test bar casting cavity 300 after entering, thereby realizing the sequential pouring with the bottom turned up.

As shown in fig. 2 and 4, a slag blocking channel 400 is further connected between the pouring channel 200 and the test rod casting cavity 300 in the present embodiment, and the slag blocking channel 400 is communicated with the bottom of the test rod casting cavity 300.

Specifically, the slag blocking channel 400 includes a slag blocking channel 400 including a retention channel 401 and an overflow channel 402, where the retention channel 401 is a cylinder channel horizontally arranged and extends horizontally toward the blank casting cavity 300 of the test rod, and the position of the retention channel is lower than that of the blank casting cavity 300 of the test rod. The retaining channel 401 is communicated with the bottom of the pouring cavity, and when the alloy liquid flows through the retaining channel 401, slag can be deposited in the retaining channel 401, so that the aim of purifying the alloy liquid is fulfilled.

The overflow channel 402 is higher than the retention channel 401 and is in communication with the test rod embryo casting cavity 300. The overflow channel 402 is a vertically arranged cylindrical channel, is arranged in parallel with the pouring channel 202, is closed at the top, is communicated with the test rod embryo casting cavity 300 on the side wall, and is communicated with the retaining channel 401 at the bottom. A slag blocking net and the like can be arranged in the slag blocking channel 400.

In this embodiment, the slag blocking channel 400 connected between the pouring channel 200 and the blank casting cavity 300 of the test rod is communicated with the bottom of the blank casting cavity 300 of the test rod, and after the alloy liquid is injected into the pouring channel 200, the alloy liquid reaches the bottom of the slag blocking channel 400, and then flows through the overflow channel 402 in a upturning mode to pour the sequence, so that gas and slag in molten steel are removed, and the purity of the alloy test rod is improved.

As shown in fig. 3 and 4, the pouring channel 202 and the slag blocking channel 400 are provided with transition arcs at corners, so that alloy liquid can be fully fused during circulation, and defects such as cold shut, slag inclusion and air holes are avoided.

As shown in fig. 2 and 4, an overflow port 402a is arranged between the test rod blank casting cavity 300 and the overflow channel 402, and two overflow ports 402a are arranged up and down; the top of the test bar embryo casting cavity 300 is provided with a feeding head 301.

Two overflow ports 402a are arranged between the test bar casting blank cavity 300 and the overflow channel 402, so that in the process of rising of alloy liquid, air at the upper parts in the slag blocking channel 400 and the test bar casting blank cavity 300 can be discharged simultaneously, the purity of the alloy test bar is improved, and the mechanical property of the test bar is further improved.

It is important to note that the construction and arrangement of the present application as shown in a variety of different exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of present invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that nevertheless fall within the scope of the appended claims.

Furthermore, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those not associated with the best mode presently contemplated for carrying out the invention, or those not associated with practicing the invention).

It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.

Claims

1. An alloy test bar preparation equipment which characterized in that: comprising the steps of (a) a step of,

the body assembly (100) comprises a left module (101) and a right module (102) which are symmetrically arranged;

a pouring channel (200) which is arranged in the body assembly (100) and comprises a pouring opening (201) and a pouring cavity;

the test bar blank casting cavity (300) is arranged in the body assembly (100) and is connected with the pouring channel (200);

a slag blocking channel (400) is further connected between the pouring channel (200) and the test bar blank casting cavity (300), and the slag blocking channel (400) is communicated with the bottom of the test bar blank casting cavity (300);

the slag blocking channel (400) comprises a retention channel (401) and an overflow channel (402);

the retaining channel (401) is communicated with the bottom of the pouring cavity, and the overflow channel (402) is higher than the retaining channel (401) and is communicated with the test rod embryo casting cavity (300);

an overflow port (402 a) is arranged between the test bar blank casting cavity (300) and the overflow channel (402), and two overflow ports (402 a) are arranged up and down.

2. The alloy test bar manufacturing apparatus according to claim 1, wherein: the pouring channel (200) and the test bar blank casting cavity (300) are arranged on the joint surface of the left module (101) and the right module (102), and the joint surface is also provided with a positioning pin (104 a) and a positioning hole (104 b).

3. The alloy test bar manufacturing apparatus according to claim 2, wherein: and a feeding head (301) is arranged at the top of the test bar blank casting cavity (300).

4. A method of making an alloy test bar, operated with the alloy test bar making apparatus of any one of claims 1-3, characterized in that: comprising

Spraying a release agent on the inner wall of alloy test rod manufacturing equipment to form a protective film;

the release agent is boron nitride coating and is prepared by mixing hexagonal boron nitride powder and industrial ethanol;

the mixing ratio of the hexagonal boron nitride powder to the industrial ethanol is 1:5, uniformly spraying the boron nitride coating on the inner wall of the metal by adopting a spray gun to form a ceramic protective film;

assembling an alloy test bar manufacturing die and carrying out external reinforcement;

heating the alloy test bar manufacturing mould to a baking temperature, and waiting for pouring alloy liquid;

pouring alloy liquid into a pouring port of the alloy test bar manufacturing die until the alloy liquid is filled in the metal die;

5. The method for manufacturing the alloy test bar according to claim 4, wherein the method comprises the following steps: the baking temperature is 500+/-20 ℃, and the baking time is more than or equal to 2 hours.

6. The method for manufacturing the alloy test bar according to claim 4, wherein the method comprises the following steps: after pouring alloy liquid from a pouring opening, the alloy liquid passes through a slag blocking channel and rises from the bottom to the inside of the test rod blank casting cavity.