CN211453422U - Aluminum alloy heat crack detection die - Google Patents
Aluminum alloy heat crack detection die Download PDFInfo
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- CN211453422U CN211453422U CN201922091211.1U CN201922091211U CN211453422U CN 211453422 U CN211453422 U CN 211453422U CN 201922091211 U CN201922091211 U CN 201922091211U CN 211453422 U CN211453422 U CN 211453422U
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Abstract
The utility model discloses a hot crack of aluminum alloy detects mould, including last die cavity, lower die cavity and pouring die cavity, seted up pouring groove and five hot crack chute branches on the die cavity down, hot crack chute branch cross sectional area is the same, hot crack chute branch length increases in proper order, hot crack chute branch one end communicates with the pouring groove mutually, other end intercommunication has the exhaust hole, the thermocouple is installed to lower die cavity bilateral symmetry, the runner has been seted up on the pouring die cavity, the runner is located the pouring groove top, and detect the hot crack branch that all hot crack points of sample correspond with the hot crack, the hot crack degree, the hot crack position corresponds the weight product with come the sign hot crack index. The utility model discloses hot crack detects the mould and is equipped with the different hot crack chute branch of five lengths, does not receive aluminum alloy physical characteristic and crystallization characteristics restriction when carrying out the aluminum alloy and examines, and the hot crack of judgement trend severity that can be accurate refers for the design basis of thin wall ization, complicated, the large-scale foundry goods structure, improves foundry goods product quality.
Description
Technical Field
The utility model relates to an aluminum alloy casting performance detects technical field, especially relates to a hot crack of aluminum alloy detects mould.
Background
Thermal cracking is the occurrence of a fracture or crack in a casting due to external forces or internal stresses or both during solidification and subsequent contraction near the solidus. At present, a detection and analysis technical means suitable for the severity of the heat cracking tendency of the aluminum alloy is not developed, so that the severity of the heat cracking tendency cannot be accurately judged and identified in the production process, and the heat cracking tendency severity is not uniformly and accurately judged in the industry for a long time, so that the adverse effects of unstable process, prolonged quality period, increased input cost and the like are caused. With the development of thin-walled, complicated and large-scale design and production of castings, the severity of the hot cracking tendency cannot be judged, the design of the structure and the size of the complex castings is limited, the performance of the castings is reduced, and the requirements of industries such as aerospace, rail transit and the like on the structure and the quality of the castings cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a hot crack of aluminum alloy detects mould to solve the problem that above-mentioned prior art exists, can be more accurate, more direct realization to the judgement of hot crack serious tendency.
In order to achieve the above object, the utility model provides a following scheme: the utility model provides an aluminum alloy heat crack detection die, which comprises an upper die cavity and a lower die cavity, wherein the upper die cavity is detachably connected with the lower die cavity, a pouring groove and a plurality of heat crack runner branches are arranged on the lower die cavity, the length of each heat crack runner branch is sequentially increased, and each heat crack runner branch sequentially comprises a branch root, a branch middle part and a branch ball part; the cross section area of the branch root is larger than that of the branch middle part, the branch root is connected with the branch middle part through a connecting part, and the connecting part sequentially comprises a branch root round angle section and a branch root reducing section; the cross section areas of the same parts of the hot cracking launder branches are the same, the cross sections of the branch root and the branch middle part of each hot cracking launder branch are trapezoidal, and the shape of the branch ball part is conical; the branch root is communicated with the pouring groove, and the branch ball part is communicated with an exhaust hole; the lower cavity is detachably connected with a pouring cavity, the pouring cavity is in contact connection with the upper cavity, a pouring gate is formed in the pouring cavity and located above the pouring groove, thermocouples are symmetrically mounted on two sides of the lower cavity, the central connecting line of the two thermocouples is perpendicular to the axes of the hot cracking runner branches and is far away from the end of the pouring groove, and the thermocouples are located between the hot cracking runner branches and the lower end face of the lower cavity.
Preferably, the number of hot runner branches is 5.
Preferably, the gate is conical, and a blocking rod is arranged in the gate.
Preferably, the inner wall of the gate is provided with capacity scale marks.
Preferably, a handle is fixedly arranged on the upper cavity.
Preferably, the thermocouple has a measurement accuracy of 0.1 ℃.
Preferably, the lower cavity is provided with a positioning groove, the upper cavity and the pouring cavity are provided with pin holes, and the positioning groove is matched with the pin holes.
The method for detecting the hot cracking of the aluminum alloy by using the detection die comprises the following steps:
1) preheating the temperature of a detection die to 100 ℃, spraying a coating on the detection die by using a spray gun, inserting a thermocouple, and preheating the temperature of the detection die to 150 ℃;
2) enabling the temperature of the aluminum alloy liquid to meet the pouring requirement of 700-800 ℃, injecting the aluminum alloy liquid into the detection mould in the step 1) from a pouring gate, and curing and forming to obtain a hot cracking detection sample;
3) each test sample for checking heat checkingThe branch fracture conditions are counted, and the branch lengths are respectively L from large to small1、L2、L3、L4、L5Branch length weight L1：L2：L3：L4：L510: 12: 15: 20: 30, degree of fracture C1Semi-fracture C2And cracks C3Semi-cracked C4Weight of degree of fracture C1：C2：C3：C44: 3: 2: 1, the fracture position is divided into a branch root fillet section D1Ball branch part D2Branched intermediate section D3Branch root reducing section D4Branch root D5Weight of fracture position D1：D2：D3：D4：D5＝1：2：3：4：5；
4) Calculating the heat cracking index of the heat cracking detection sample, and representing the heat cracking index by the sum of the heat cracking branches corresponding to all heat cracking points of the heat cracking detection sample, the heat cracking degree and the weight product corresponding to the heat cracking position, wherein in the formula, R is ∑ Lm×Cm×Dm. If a hot cracking branch sample has a plurality of hot cracking points, the weighted products corresponding to the hot cracking branches, the hot cracking degrees and the hot cracking positions corresponding to all the hot cracking points are added.
The utility model discloses a following technological effect:
the hot cracking detection die is provided with five hot cracking launder branch branches with the same cross section area and different lengths, is more suitable for aluminum alloy detection, is not limited by the physical characteristics and the crystallization characteristics of aluminum alloy, represents a hot cracking index by using the sum of the weight products corresponding to all hot cracking points of a test sample, such as the hot cracking branches, the hot cracking degree and the hot cracking positions, can more accurately judge the severity of the hot cracking tendency, and is a design basis reference for thin-walled, complicated and large-sized casting structures, and the quality of casting products is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a sectional view of the hot cracking detection die for aluminum alloy of the present invention;
FIG. 2 is a top view of the aluminum alloy hot cracking detection mold of the present invention;
FIG. 3 is a top view of the lower cavity of the present invention;
FIG. 4 is a cross-sectional view of the casting cavity of FIG. 2 taken in the direction A-A;
wherein, 1 upper die cavity, 2 lower die cavities, 3 pouring grooves, 4 hot cracking runner branches, 41 branch roots, 42 branch root fillet sections, 43 branch root diameter-changing sections, 44 branch middle parts, 45 branch ball parts, 5 exhaust holes, 6 pouring die cavities, 7 pouring gates, 8 thermocouples, 9 blocking rods, 10 pin holes, 11 positioning grooves, 12 positioning pins and 13 handles.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Referring to fig. 1-4, the utility model provides an aluminum alloy heat crack detection mold, which comprises an upper cavity 1, a lower cavity 2 and a pouring cavity 6, wherein a handle 13 is fixedly arranged on the upper cavity 1, so as to facilitate mold closing and demolding of the detection mold, the upper cavity 1 and the pouring cavity 6 are arranged above the lower cavity 2, the pouring cavity 6 is in contact connection with the upper cavity 1, a positioning groove 11 is arranged on the lower cavity 2, pin holes 10 are respectively arranged on the upper cavity 1 and the pouring cavity 6, the positioning groove 11 is matched with the pin holes 10, a positioning pin 12 is arranged in the positioning groove 11 and the pin hole 10, the relative positions of the upper cavity 1, the lower cavity 2 and the pouring cavity 6 are fixed by the positioning pin 12, mutual dislocation among the upper cavity 1, the lower cavity 2 and the pouring cavity 6 is prevented, a pouring groove 3 and five heat crack flow grooves 4 are arranged on the lower cavity 2, the length of each hot cracking runner branch 4 is increased in sequence, and each hot cracking runner branch 4 comprises a branch root part 41, a branch middle part 44 and a branch ball part 45 in sequence; the cross-sectional area of the branch root 41 is larger than that of the branch middle part 44, the branch root 41 is connected with the branch middle part 44 through a connecting part, and the connecting part sequentially comprises a branch root round angle section 42 and a branch root reducing section 43; the cross-sectional areas of the same parts of the hot cracking runner branches 4 are the same, the cross sections of the branch root part 41 and the branch middle part 44 of each hot cracking runner branch 4 are trapezoidal, and the branch ball part 45 is conical; the branch root part 41 is communicated with the pouring groove 3, and the branch ball part 45 is communicated with the exhaust hole 5; the pouring cavity 6 is provided with a pouring gate 7, the pouring gate 7 is conical, a blocking rod 9 is arranged in the pouring gate 7, the inner wall of the pouring gate 7 is provided with capacity scale marks, the bottom of the pouring gate 7 is blocked by the blocking rod 9, the amount of aluminum alloy liquid poured into the pouring gate 7 can be accurately controlled by matching with the capacity scale marks on the inner wall of the pouring gate 7, the pouring gate 7 is positioned above the pouring groove 3, thermocouples 8 are symmetrically arranged on two sides of the lower cavity 2, the measuring accuracy of the thermocouples 8 is 0.1 ℃, the central connecting line of the thermocouples 8 is perpendicular to the axis of the hot runner branch 4 and is far away from the end of the pouring groove 3, and the thermocouples 8 are positioned between the hot runner branch 4 and the lower end face of the lower cavity 2.
The method for detecting the hot cracking of the aluminum alloy by using the detection die comprises the following steps:
1) preheating the temperature of a detection die to 100 ℃, spraying a coating on the detection die by using a spray gun, inserting a thermocouple 8, and preheating the temperature of the detection die to 150 ℃;
2) enabling the temperature of the aluminum alloy liquid to meet the pouring requirement of 700-800 ℃, injecting the aluminum alloy liquid into the detection die in the step 1) from a pouring gate 7, and curing and forming to obtain a hot cracking detection sample;
3) counting the fracture conditions of each branch of the hot cracking detection sample, wherein the branch lengths are respectively L from large to small1、L2、L3、L4、L5Branch length weight L1：L2：L3：L4：L510: 12: 15: 20: 30, degree of fracture C1Semi-fracture C2And cracks C3Semi-cracked C4Weight of degree of fracture C1：C2：C3：C44: 3: 2: 1, the fracture position is divided into a branch root fillet section 42D1Branch ball portion 45D2Branched intermediate section 44D3Branch root tapered section 43D4Branch root 41D5Weight of fracture position D1：D2：D3：D4：D5＝1：2：3：4：5；
4) Calculating the heat cracking index of the heat cracking detection sample, and representing the heat cracking index by the sum of the heat cracking branches corresponding to all heat cracking points of the heat cracking detection sample, the heat cracking degree and the weight product corresponding to the heat cracking position, wherein in the formula, R is ∑ Lm×Cm×Dm。
When in application, the detection die is matched with an aluminum alloy smelting furnace for use.
Example 1:
and (3) detecting the severity of hot cracking tendency of the 6061 aluminum alloy.
Firstly, batching and smelting according to the national standard components of 6061 aluminum alloy, then adding an Al-Ti-B refiner, preheating the temperature of a detection die to 100 ℃, spraying a coating on the detection die by using a spray gun, inserting a thermocouple 8, and preheating the die to 150 ℃. When the measured components of the aluminum alloy liquid meet the labeling requirements, the detected slag inclusion content is qualified, and the temperature meets the casting requirement of 720 ℃, injecting the aluminum liquid into a mold from a pouring gate 7 to prepare a hot cracking detection sample, and calculating a hot cracking index according to a formula. The branching, position and degree of the thermal cracking point are shown in the following table, and the thermal cracking index R is 432, which is 10 × 4 × 1+12 × 3 × 2+15 × 2 × 3+20 × 1 × 4+30 × 1 × 5, and the thermal cracking index is 432.
| Hot cracking of branches | L1 | L2 | L3 | L4 | L5 |
| Degree of hot cracking | Fracture of | Half fracture | Crack(s) | Half crack | Half crack |
| Hot cracking site | Root fillet | Ball end | Intermediate (II) | Root diameter-changing part | Root of a tree |
And (3) carrying out batching and smelting according to the national standard components of 6061 aluminum alloy, repeatedly preparing a hot cracking detection sample without adding an Al-Ti-B refiner, and calculating a hot cracking index according to a formula. The branching, position and degree of the thermal cracking point are shown in the following table, the thermal cracking index R is 15 × 3 × 3+20 × 4 × 3+30 × 4 × 3 ═ 735, and the thermal cracking index is 735.
| Hot cracking of branches | L1 | L2 | L3 | L4 | L5 |
| Degree of hot cracking | -- | -- | Half fracture | Fracture of | Fracture of |
| Hot cracking site | -- | -- | Intermediate section | Intermediate section | Intermediate section |
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "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 merely for convenience of description of the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
The above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and those skilled in the art should also be able to make various modifications and improvements to the technical solution of the present invention without departing from the spirit of the present invention, and all such modifications and improvements are intended to fall within the scope of the present invention as defined in the appended claims.
Claims (7)
1. The aluminum alloy hot cracking detection die is characterized by comprising an upper die cavity (1) and a lower die cavity (2), wherein the upper die cavity (1) is detachably connected with the lower die cavity (2), a pouring trough (3) and a plurality of hot cracking runner branches (4) are formed in the lower die cavity (2), the length of each hot cracking runner branch (4) is sequentially increased, and each hot cracking runner branch (4) sequentially comprises a branch root part (41), a branch middle part (44) and a branch ball part (45); the cross-sectional area of the branch root part (41) is larger than that of the branch middle part (44), the branch root part (41) is connected with the branch middle part (44) through a connecting part, and the connecting part sequentially comprises a branch root round-angle section (42) and a branch root reducing section (43); the cross section areas of the same parts of the hot cracking runner branches (4) are the same, the sections of the branch root parts (41) and the branch middle parts (44) of the hot cracking runner branches (4) are trapezoidal, and the branch ball parts (45) are conical; the branch root (41) is communicated with the pouring groove (3), and the branch ball part (45) is communicated with an exhaust hole (5); the improved hot runner device is characterized in that a pouring cavity (6) is detachably connected to the lower cavity (2), the pouring cavity (6) is in contact connection with the upper cavity (1), a pouring gate (7) is formed in the pouring cavity (6), the pouring gate (7) is located above the pouring trough (3), thermocouples (8) are symmetrically arranged on two sides of the lower cavity (2), two thermocouples (8) are connected to the center of the thermocouple (8) and are perpendicular to the axis of the hot runner branch (4) and far away from the end of the pouring trough (3), and the thermocouples (8) are located between the hot runner branch (4) and the lower end face of the lower cavity (2).
2. The aluminum alloy hot cracking detection die of claim 1, wherein the number of hot cracking launder branches (4) is 5.
3. The aluminum alloy hot cracking detection die according to claim 1, wherein the gate (7) is conical, and the gate (7) is provided with a blocking rod (9).
4. The aluminum alloy hot cracking detection die of claim 3, wherein the inner wall of the sprue (7) is provided with capacity graduations.
5. The aluminum alloy hot cracking detection die of claim 1, wherein a handle (13) is fixedly mounted on the upper cavity (1).
6. The aluminum alloy hot cracking detection die of claim 1, wherein the thermocouple (8) has a measurement accuracy of 0.1 ℃.
7. The aluminum alloy hot crack detection die as claimed in claim 1, wherein the lower cavity (2) is provided with a positioning groove (11), the upper cavity (1) and the pouring cavity (6) are provided with pin holes (10), and the positioning groove (11) is matched with the pin holes (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922091211.1U CN211453422U (en) | 2019-11-28 | 2019-11-28 | Aluminum alloy heat crack detection die |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922091211.1U CN211453422U (en) | 2019-11-28 | 2019-11-28 | Aluminum alloy heat crack detection die |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114595567A (en) * | 2022-03-03 | 2022-06-07 | 北京科技大学 | Aluminum alloy casting heat crack simulation device and heat crack prediction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114595567A (en) * | 2022-03-03 | 2022-06-07 | 北京科技大学 | Aluminum alloy casting heat crack simulation device and heat crack prediction method |
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