Die and method for alloy and insert integrated die-casting experiment

Abstract

The invention discloses a mold and a method for an alloy and insert integrated die-casting experiment. The mold comprises a movable mold and a fixed mold, wherein a runner and a corresponding sprue are arranged in the center between the movable die and the fixed die, a plurality of die-casting cavities are arranged on two sides of the runner, and each die-casting cavity is provided with an exhaust and cinder ladle structure; the die-casting cavity is provided with an insert which is inserted from the outside and is fixed and limited by an insert pressing block, and the inner wall of a port of the die-casting cavity corresponding to the insert pressing block side is an inclined surface; and an auxiliary heating device for heating the insert is arranged on the fixed mold close to the insert pressing block. The method can be used for evaluating and verifying the alloy and insert die-casting forming performance, integrated die-casting experiments of various insert types can be achieved, construction and operation are easy, the cost is low, and experiment results can be used for conducting design guidance on industrial production.

Description

Technical Field

[0001] The invention relates to the technical field of die casting, and in particular to a mold and a method for an alloy and insert integral die casting experiment. Background Art

[0002] Alloys can be formed into a certain shape through die-casting dies, but the performance of die-castings is basically determined by the alloy, so the performance of the entire structure is basically the same. For some special-purpose scenarios, such as places with particularly high requirements for structural strength, hardness, wear resistance, conductivity, corrosion resistance, etc., alloy die-casting is difficult to meet.

[0003] The alloy and insert are die-casted in one piece, which fully utilizes the excellent performance of the insert and is integrated with the die-cast body structure to meet more application scenarios.

[0004] At present, inserts such as insert bolts, nuts, and clips have been widely used. However, these application scenarios are relatively simple and mainly play simple roles such as fixing and positioning. There are relatively few structures used for bearing or other special functions. This is mainly because there is a certain compatibility between the fluidity of the alloy and the insert. The combined performance and usage performance of the two need to be optimized and verified, and some may still have defects. Therefore, it also limits the promotion and application of the alloy.

[0005] How to verify the bonding performance and performance between alloy and insert better and at a lower cost? How to guide industrial application more effectively? It is necessary to conduct actual die casting and related experiments to accumulate relevant data. Therefore, in order to better promote the application of die casting alloys and further promote the application of alloy and insert integrated die casting, there is an urgent need for experimental molds that can perform alloy and insert integrated die casting. Summary of the invention

[0006] The purpose of the present invention is to provide a mold and method for integrated die-casting experiments of alloys and inserts, which are used to evaluate and verify the die-casting forming performance of alloys and inserts; the mold can realize integrated die-casting experiments of various insert types, is easy to construct and operate, has low cost, and the experimental results can be used to provide design guidance for industrial production.

[0007] To achieve the above object, the technical solution of the present invention is:

[0008] A mold for die-casting experiments of alloys and inserts, comprising a movable mold and a fixed mold; wherein: a flow channel and a corresponding gate are arranged in the center between the movable mold and the fixed mold, a plurality of die-casting cavities are arranged on both sides of the flow channel, and each die-casting cavity is provided with an exhaust and slag bag structure; the die-casting cavity is provided with an insert inserted from the outside, and is fixed and limited by an insert pressing block, and the inner wall of the die-casting cavity port corresponding to the insert pressing block side is an inclined surface; an auxiliary heating device for heating the insert is arranged near the insert pressing block of the fixed mold.

[0009] Preferably, the inclined surface of the inner wall of the die-casting cavity port on the side of the corresponding insert pressing block forms an angle of 5 to 90 degrees with the axis of the die-casting cavity.

[0010] Preferably, the slag trap and the exhaust are located between the moving die and the insert pressing block, and a gap is maintained between the moving die and the insert, preferably 0.1 to 2 mm.

[0011] Preferably, the insert is a plate-shaped insert, a rod-shaped insert or a special-shaped insert.

[0012] The die-casting method using the mold of the present invention includes the following steps:

[0013] 1) Pretreatment: Spraying a mold release agent on the surface of the die-casting cavity of the mold for demolding;

[0014] 2) Placing the insert into the mold cavity and clamping it by the insert pressing block; preheating the insert to a heating temperature of 200 to 750 °C;

[0015] 3) Die-casting

[0016] The moving die is pressed tightly, and then the alloy liquid is pressed into the die-casting cavity; the holding pressure time is 2 s to 5 min; during die-casting and holding pressure, the insert is kept warm by an auxiliary heating device, and the average cooling rate is controlled to be 2 to 90 °C / s;

[0017] 4) Mold opening

[0018] The moving die is opened, the insert pressing block is opened, and the casting and the insert are ejected together.

[0019] Preferably, the die-casting cavity can be die-cast with single-sided, four-sided or five-sided coating according to needs.

[0020] Die-casting molds are generally very complex due to heat preservation, cooling, gates, runners, exhaust, etc. If the insert process is debugged with a die-casting mold, it will be inefficient and costly. Therefore, through the insert integrated die-casting experimental mold of the present invention, the bonding process method, structural form, coating angle, etc. of the insert can be quickly verified and evaluated flexibly, efficiently and at low cost, and used for preliminary scheme screening and evaluation. After forming an effective insert process plan, it is then applied to the formal mold. The present invention avoids debugging the insert process in the formal mold, reduces the actual production cost and improves the work efficiency.

[0021] The mold of the present invention distributes the gates and runners in the middle or at both ends, has multiple cavities, and can experiment with various forms of insert processes at one time, facilitating large-scale experiments, obtaining the performance levels of different insert processes, and improving the experimental efficiency.

[0022] Specifically, at the combined part of the insert and die-casting, exhaust vents and slag traps are specially designed, which is beneficial to discharging the air and foreign matters on the surface of the insert during die-casting, and improving the bonding performance between the casting and the insert.

[0023] The insert is fixed outside the cavity and equipped with an auxiliary heating device to control the initial temperature and cooling rate of the insert. In order to obtain better bonding, by controlling the temperature and cooling rate of the insert, the internal stress between the casting and the insert is eliminated, and the internal stress formed during the cooling process due to the different specific heat capacities and thermal expansion coefficients between the insert and the alloy is improved, avoiding the formation of interface separation between the insert and the alloy interface, and improving the bonding performance.

[0024] The structure and surface state of the insert are adjusted according to experimental needs.

[0025] For plate-shaped inserts, single-sided, four-sided, and five-sided die-casting can be achieved, which is suitable for various requirements.

[0026] For the die-casting form of the exposed joint part with the metal insert, different coating angles are set to improve the coating effect and increase the bonding strength.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] The present invention innovatively combines the slag trap and exhaust vents with the insert, which helps to reduce and improve the slag inclusion and porosity problems existing between the molten alloy and the insert, and improves the bonding strength between the die-casting alloy and the insert.

[0029] The present invention can be used to quickly verify and evaluate the bonding process method, thermal-assisted process, structural form, coating angle optimization, etc. of different insert structures, for preliminary evaluation, avoiding debugging the insert process in the formal mold, reducing the actual production cost, and improving the efficiency.

[0030] The mold described in the present invention is applicable to the evaluation of plate-shaped inserts, column-shaped inserts, and special-shaped inserts, and meets the insert structure requirements of most scenarios.

[0031] The present invention is easy to operate, and the experimental mold is basically the same as the actual formal mold in terms of process state, and has strong representativeness.

[0032] The mold described in the present invention solves the problem that the traditional method requires die-casting with the insert in the actual mold, which has huge costs and risks. Through this experimental mold, it can not only effectively represent the die-casting state of the actual alloy and the insert, but also save costs and shorten the cycle to complete the experimental verification work, with strong operability and simplicity. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Structural schematic of the mold embodiment described in the present invention Figure 1;

[0034] Figure 2 Schematic structure of the mold embodiment of the present invention Figure 2 ;

[0035] Figure 3 Schematic of the working state of the embodiment of the present invention Figure 1 ;

[0036] Figure 4 is Figure 3 Enlarged schematic view of part A of;

[0037] Figure 5 Schematic of the working state of the embodiment of the present invention Figure 2 . Detailed implementation manners

[0038] Referring to Figures 1 to 5 , the mold for the integrated die-casting experiment of alloy and insert of the present invention includes a moving mold 1 and a fixed mold 2; wherein: a runner 3 and a corresponding gate 4 are arranged in the center between the moving mold 1 and the fixed mold 2, and a plurality of die-casting cavities 5 are arranged on both sides of the runner 3. Each die-casting cavity 5 is provided with an exhaust and slag trap structure 6; an insert 7 inserted from the outside is arranged in the die-casting cavity 5 and is fixed and limited by an insert pressing block 8. The inner wall of the port of the die-casting cavity 5 on the side corresponding to the insert pressing block 8 is an inclined surface 51; an auxiliary heating device 9 for heating the insert 7 is arranged on the fixed mold 2 near the insert pressing block 8.

[0039] Preferably, the inclined surface 51 of the inner wall of the port of the die-casting cavity 5 on the side corresponding to the insert pressing block 8 forms an angle α of 5 to 90 degrees with the axis of the die-casting cavity 5.

[0040] Preferably, the slag trap and the exhaust are located between the moving mold and the insert pressing block, and a gap is maintained between the moving mold and the insert, preferably 0.1 to 2 mm.

[0041] Preferably, the insert is a plate-shaped insert, a rod-shaped insert or a special-shaped insert.

[0042] The die-casting method using the mold of the present invention includes the following steps:

[0043] 1) Pretreatment: Spraying a release agent on the surface of the die-casting cavity of the mold for demoulding; preheating the insert, and the heating temperature is 200 to 750 °C;

[0044] 2) Placing the insert into the mold cavity and clamping it with an insert pressing block;

[0045] 3) Die-casting

[0046] Pressing the moving mold, and then injecting the alloy liquid into the die-casting cavity; the holding pressure time is 2 s to 5 min; during the die-casting period and the holding pressure period, the insert is kept warm through the auxiliary heating device, and the average cooling rate is controlled to be 2 to 90 °C / s;

[0047] 4) Mold opening

[0048] The moving mold opens, the insert pressing block opens, and the casting and the insert are ejected together.

[0049] Preferably, the die-casting cavity can be die-cast with single-sided, four-sided or five-sided coating according to needs.

Claims

1. A mold for the integrated die-casting experiment of an alloy and an insert, comprising a moving mold and a fixed mold; characterized in that: A runner and corresponding gates are arranged in the center between the moving die and the fixed die. Several die-casting cavities are arranged on both sides of the runner. Each die-casting cavity is provided with an exhaust and slag trap structure. The die-casting cavity is provided with inserts inserted from the outside and fixed and limited by insert blocks. The inner wall of the port of the die-casting cavity on the side corresponding to the insert block is an inclined surface. An auxiliary heating device for heating the insert is arranged near the insert block on the fixed die.

2. The mold for the integrated die-casting experiment of alloy and insert according to claim 1, characterized in that: The insert is a plate-shaped insert, a rod-shaped insert or a special-shaped insert.

3. The mold for the integrated die-casting experiment of alloy and insert according to claim 1 or 2, characterized in that: The inclined surface of the inner wall of the port of the die-casting cavity on the side corresponding to the insert block forms an angle of 5 to 90 degrees with the axis of the die-casting cavity.

4. The mold for the integrated die-casting experiment of alloy and insert according to claim 1 or 2 or 3, characterized in that: The slag trap and exhaust are located between the moving die and the insert block. A gap is maintained between the moving die and the insert, preferably 0.1 to 2 mm.

5. A die-casting method using the mold according to any one of claims 1 to 4, characterized in that: It includes the following steps: 1) Pretreatment: Spraying a mold release agent on the surface of the die-casting cavity of the mold for demolding; preheating the insert, and the heating temperature is 200 to 750 °C; 2) Placing the insert into the mold cavity and clamping it with the insert block; 3) Die-casting The moving die is pressed tightly, and then the alloy liquid is pressed into the die-casting cavity; the holding pressure time is 2 s to 5 min; during die-casting and holding pressure, the insert is kept warm through the auxiliary heating device, and the average cooling rate is controlled to be 2 to 90 °C / s; 4) Mold opening The moving die is opened, the insert block is opened, and the casting and the insert are ejected together.

6. The method according to claim 5, characterized in that, The die-casting cavity can be die-cast with single-sided, four-sided or five-sided coating according to needs.

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