Die-casting die

Abstract

The utility model belongs to the technical field of dies, and discloses a die-casting die which comprises a front die core and a rear die core which are oppositely arranged. A first workpiece machining part and a runner are arranged on the side, facing the front mold core, of the rear mold core, and the runner communicates with the first workpiece machining part. The side, facing the rear mold core, of the front mold core is provided with a second workpiece machining part and a stop block, the second workpiece machining part and the first workpiece machining part are buckled with each other and define a mold cavity, the stop block is arranged close to the mold cavity, and a gap is formed between the stop block and the runner. According to the utility model, the impact damage of molten metal to the die is greatly reduced by arranging the stop block, and the die is ensured to stably operate in a long period. Meanwhile, the problems of air entrapment and air holes caused by high-speed flowing are avoided, surface defects such as flow marks, cold shut and flash caused by turbulent flow are eliminated, the appearance smoothness of products is greatly improved, and the yield is remarkably increased.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to a die-casting mold. Background Technology

[0002] In the field of die casting molds, mold design is closely linked to product quality and production efficiency, but die casting molds currently face many thorny problems in practical applications.

[0003] As product structures become increasingly complex, die-casting mold design faces numerous limitations. To meet the molding requirements of different products, it is often necessary to set up runners at the gating point. However, a significant difference between the cross-sectional area of ​​the runner and the cross-sectional area of ​​the gate can easily lead to a series of serious consequences. On the one hand, when the molten metal flows through the gating system, the sudden change in cross-sectional area causes a rapid spike in the pouring speed and a sharp increase in temperature. At the weakest point of the mold, the high-speed scouring of the molten metal at the sprue causes severe erosion of the mold surface, damaging not only the integrity of the mold but also significantly reducing the precision of the mold cavity. On the other hand, the excessively high instantaneous velocity of the molten metal also poses a hidden danger to product quality. The high-speed flowing molten metal tumbles violently within the cavity, easily entraining a large amount of air. This air cannot be expelled in time during the die-casting process and eventually solidifies inside the product, forming air entrapment and porosity defects. This greatly reduces the mechanical properties and appearance quality of the product, resulting in a large number of defective products. The molds need to be taken off the machine for welding and repair. However, the molds can only be put back on the machine for a short period of production before they need to be taken off the machine again for welding and repair. The frequent taking of molds off and on the machine wastes a lot of production time, mold repair time, and manpower and financial resources for handling defective products in the subsequent processes.

[0004] Therefore, there is an urgent need in this field for a die-casting mold to solve the above-mentioned technical problems. Utility Model Content

[0005] In view of this, the purpose of this utility model is to solve the above problems and provide a die-casting mold, including a front mold core and a rear mold core arranged opposite to each other;

[0006] The rear mold core is provided with a first workpiece processing section and a flow channel on the side facing the front mold core, and the flow channel is connected to the first workpiece processing section;

[0007] The front mold core is provided with a second workpiece processing part and a blocking block on the side facing the rear mold core. The second workpiece processing part and the first workpiece processing part are interlocked and form a mold cavity. The blocking block is located close to the mold cavity, and there is a gap between the blocking block and the flow channel.

[0008] As a further improvement of this utility model, the blocking block includes a blocking end, a blocking bottom, and a connecting wall, wherein the blocking bottom and the blocking end are connected through the connecting wall.

[0009] As a further improvement of the utility model, the blocking end is arc-shaped.

[0010] As a further improvement of the utility model, the number of the connecting walls is four, and the connecting part of each connecting wall is provided with an arc-shaped chamfer.

[0011] As a further improvement of the utility model, the flow channel comprises a main flow channel and a branch flow channel in communication with the main flow channel, and the branch flow channel is in communication with the mold cavity.

[0012] As a further improvement of the utility model, the branch flow channel is provided with a first buffer surface at one end in communication with the mold cavity.

[0013] The connecting wall comprises a second buffer surface, and the second buffer surface is arranged in parallel with the first buffer surface.

[0014] As a further improvement of the utility model, the distance between the second buffer surface and the first buffer surface is between 2mm and 5mm.

[0015] As a further improvement of the utility model, the depth of the branch flow channel is between 10mm and 15mm.

[0016] As a further improvement of the utility model, the front mold core is provided with a liquid injection hole, and the liquid injection hole is in communication with the main flow channel.

[0017] As a further improvement of the utility model, the rear mold core is provided with a material taking hole, and the material taking hole is in communication with the branch flow channel.

[0018] The utility model discloses a die-casting die, and compared with the prior art, the utility model discloses a kind of die-casting die, and the second workpiece processing part of front mold core and the first workpiece processing part of rear mold core are clamped, realize accurate buckling, facilitate product to be smoothly taken out after pressure casting, avoid to pull the surface of product.The resistance when metal liquid frontal impact is reduced by being close to mold cavity and being set blocking block, when metal liquid is in from flow channel at high speed, impact to the surface of blocking block, since the clearance between blocking block and flow channel is limited, metal liquid cannot be straightly rushed into mold cavity, only can advance along the clearance between blocking block and flow channel, rapidly reduce the flow rate of metal liquid, create favorable conditions for stable filling cavity.Metal liquid impact damage to mold is greatly reduced, the number of times of repair due to mold damage is reduced, mold maintenance cost is reduced, ensure that mold is stably operated in longer period.Meanwhile, metal liquid flow rate becomes stable after blocking block, so that the flow state of metal liquid entering mold cavity is greatly improved.On the one hand, effectively avoid the gas, air hole problem caused by high-speed flow, meet the strict requirements of product to quality;On the other hand, stable metal liquid flow eliminates the surface defects, such as flow mark, cold separation, burr, etc., caused by turbulence, and product appearance finish is greatly improved, and good product rate is significantly increased. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model, not all embodiments. For those skilled in the art, other drawings obtained from these drawings without creative effort are all within the protection scope of this utility model.

[0020] Figure 1 This is a perspective view of a die-casting mold provided in an embodiment of this utility model;

[0021] Figure 2 This is a perspective view of a front mold core provided in an embodiment of this utility model;

[0022] Figure 3 This is a perspective view of a rear mold core provided in an embodiment of this utility model;

[0023] Figure 4 This is a top view of a die-casting mold provided in an embodiment of this utility model;

[0024] Figure 5 yes Figure 4 Sectional view at CC.

[0025] Among them, 10 is the front mold core, 11 is the second workpiece processing part, 12 is the blocking block, 121 is the blocking end, 122 is the blocking bottom, 123 is the connecting wall, 1231 is the second buffer surface, 13 is the gap, and 14 is the liquid injection hole.

[0026] 20 is the rear mold core, 21 is the first workpiece processing section, 22 is the runner, 221 is the main runner, 222 is the branch runner, 2221 is the first buffer surface, and 23 is the material pick-up hole. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0028] To make the description of the present disclosure more detailed and complete, the following describes the embodiments of the present application in detail. However, this is not the only form of implementation or use of the embodiments of the present application. The embodiments include the features of the specific embodiments and the method steps and their order for constructing and operating these specific embodiments. However, other specific embodiments can also be used to achieve the same or equivalent functions and step sequences. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0029] It should be noted that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0030] It should be understood that the terms "first", "second", etc. in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0031] In the description of the present application, the terms "front", "back", "top", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0032] Please refer to Figures 1-5 An embodiment of the present application provides a die casting mold to solve the problem that the high-speed scouring of the existing metal liquid destroys the integrity of the mold, the mold is frequently repaired on and off the machine, manpower and financial resources are wasted, and the mechanical properties and appearance quality of the product are reduced, resulting in a large number of products becoming defective products.

[0033] Specifically, please refer to Figure 1 A perspective view of a die casting mold provided by the embodiments of the present application, the present application provides a die casting mold, comprising a front mold core 10 and a rear mold core 20 arranged opposite to each other; please refer to Figures 2-3The side of the back die core 20 facing the front die core 10 is provided with a first workpiece processing part 21 and a flow channel 22, and the flow channel 22 communicates with the first workpiece processing part 21; the side of the front die core 10 facing the back die core 20 is provided with a second workpiece processing part 11 and a blocking block 12, the second workpiece processing part 11 and the first workpiece processing part 21 are mutually engaged and form a mold cavity, the blocking block 12 is arranged close to the mold cavity, and a gap 13 is provided between the blocking block 12 and the flow channel 22. By clamping the second workpiece processing part 11 of the front die core 10 and the first workpiece processing part 21 of the back die core 20, precise clamping is achieved. The design of the parting surface of the front die core 10 and the back die core 20 also considers the product demolding requirement, which facilitates the smooth demolding of the product after die casting and avoids damaging the surface of the product. By arranging the blocking block 12 close to the mold cavity, the resistance when the metal liquid impacts the front is reduced. When the metal liquid flows into the flow channel 22 at high speed, it hits the surface of the blocking block 12. Due to the limitation of the gap 13 between the blocking block 12 and the flow channel 22, the metal liquid cannot flow straight into the mold cavity, but only can move along the gap 13 between the blocking block 12 and the flow channel 22, which rapidly reduces the flow rate of the metal liquid and creates favorable conditions for stable filling of the cavity. The impact damage of the metal liquid to the mold is greatly reduced, the number of times of repairing the mold due to damage is reduced, the mold maintenance cost is reduced, and the stable operation of the mold in a long period is ensured. At the same time, the metal liquid flow rate becomes stable after passing through the blocking block 12, so that the flow state of the metal liquid entering the mold cavity is greatly improved. On the one hand, the problems of gas entrapment and porosity caused by high-speed flow are effectively avoided, which meets the strict requirements of products on quality; on the other hand, the stable metal liquid flow eliminates the surface defects caused by turbulence, such as flow marks, cold shuts, flash, etc., the appearance of the product is greatly improved, and the yield is significantly increased.

[0034] As a further improvement of the utility model, the blocking block 12 includes a blocking end 121, a blocking bottom 122 and a connecting wall 123, the blocking bottom 122 is connected with the blocking end 121 through the connecting wall 123. By setting the blocking block 12 includes a blocking end 121, a blocking bottom 122 and a connecting wall 123, the blocking bottom 122 is connected with the blocking end 121 through the connecting wall 123, the blocking end 121 is directly faced with the front part of metal liquid impact, the maximum degree reduces the resistance when metal liquid frontal impact, makes metal liquid can flow into the mold cavity along the gap 13 between the blocking block 12 and the runner 22. The blocking bottom 122 is set to realize the close adhesion with the front mold core 10, ensure that the blocking block 12 is stable under the high-pressure metal liquid impact, does not displace or sway. The connecting wall 123 connects the blocking end 121 and the blocking bottom 122, guarantees the structural strength of the blocking block 12, and can guide the metal liquid into the gap 13 between the blocking block 12 and the runner 22. When the metal liquid flows at high speed from the runner 22, it impacts the blocking end 121, and due to the gap 13 limitation of the blocking bottom 122 and the connecting wall 123, the metal liquid cannot flow into the cavity in a straight line, effectively reduces the flow speed of the metal liquid into the mold cavity, reduces the erosion of the metal liquid to the mold, and improves the service life of the mold.

[0035] As a further improvement of the utility model, the blocking end 121 is arc-shaped. By setting the blocking end 121 as arc-shaped, when the high-temperature and high-speed metal liquid rushes towards the blocking block 12, the arc-shaped blocking end 121 forms a diversion dam, changes the flow direction of the metal liquid, and makes it flow along the tangent line of the curved surface at low speed. The impact force of frontal collision is greatly reduced, the concentrated explosion of metal liquid energy is avoided, the mold is effectively protected from the erosion of the metal liquid to the mold. The arc-shaped design also has a turbulence suppression capability. When the metal liquid flows through the arc-shaped surface, due to its smooth transition characteristics, it is not easy to produce violent vortex and turbulent flow state, so that the subsequent flow of the metal liquid into the mold cavity is more stable and orderly, laying a foundation for high-quality die casting.

[0036] As a further improvement of the utility model, the number of the connecting walls 123 is four, and the connecting part of each connecting wall 123 is provided with an arc-shaped chamfer. By setting the number of the connecting walls 123 to four, a stable and balanced support frame is constructed between the blocking end part 121 and the blocking bottom part 122. When the blocking block 12 is subjected to the impact of the metal liquid, the force can be evenly dispersed on each connecting wall 123, so that the structure damage caused by excessive local stress is avoided, the overall structural strength and stability of the blocking block 12 are significantly improved, and the reliable performance in long-term and high-strength die casting operation is ensured. By setting the arc-shaped chamfer at the connecting part of each connecting wall 123, when the metal liquid flows through the connecting wall 123, the arc-shaped chamfer can effectively reduce the local resistance of the fluid, avoid the turbulence phenomenon caused by the right-angle or acute-angle connecting part, ensure the smooth flow of the metal liquid, and create favorable conditions for the subsequent smooth entry into the cavity. At the same time, the arc-shaped chamfer can also enhance the stress distribution uniformity of the connecting wall 123 itself, reduce the stress concentration point, reduce the risk of cracking and damage of the connecting wall 123 when subjected to the impact of the metal liquid, and further prolong the service life of the blocking block 12 and even the entire mold.

[0037] As a further improvement of the utility model, the flow channel 22 comprises a main flow channel 221 and a branch flow channel 222 in communication with the main flow channel 221, and the branch flow channel 222 is in communication with the mold cavity. By setting the flow channel 22 comprising the main flow channel 221 and the branch flow channel 222 in communication with the main flow channel 221, and the branch flow channel 222 is in communication with the mold cavity, in actual production, the metal liquid enters the main flow channel 221, and then is accurately distributed to each mold cavity through the branch flow channel 222. The number of the branch flow channel 222 is dynamically adjusted according to the number of the mold cavities. Compared with the traditional die casting mold, the metal liquid has uneven flow rate in the flow channel 22, large pressure fluctuation, frequent impact on the wall of the flow channel 22 and the inlet of the mold cavity, which causes the mold to be eroded and worn out prematurely, and the service life is seriously limited. The optimized flow channel 22 structure of the embodiment can effectively disperse the impact force of the metal liquid by buffering and reducing the speed of the main flow channel 221, accurate distribution of the branch flow channel 222, and overall collaborative optimization, so that the erosion rate of the mold is greatly reduced.

[0038] As a further improvement of the utility model, please see Figures 4-5The first buffer surface 2221 is arranged at one end of the branch runner 222 communicating with the mold cavity, and the second buffer surface 1231 is arranged in parallel with the first buffer surface 2221. The first buffer surface 2221 is arranged at one end of the branch runner 222 communicating with the mold cavity, so as to slow down the speed of the metal liquid when entering the mold cavity. The first buffer surface 2221 is designed by a smooth transition, so that the metal liquid can gradually slow down when entering the cavity, and the impact force on the inner wall of the cavity is reduced. The second buffer surface 1231 is arranged in parallel with the first buffer surface 2221, so as to ensure that the metal liquid can form a relatively stable flow channel between the two parallel buffer surfaces during the process of entering the cavity from the branch runner 222, further slow down the speed of the metal liquid, reduce the generation of turbulence and bubbles, and ensure that the metal liquid can be uniformly and stably filled in the cavity. Not only the flow rate of the metal liquid is effectively slowed down, and the erosion of the mold is reduced, but also the quality of the product is significantly improved, and the production efficiency is optimized.

[0039] As a further improvement of the utility model, the distance between the second buffer surface 1231 and the first buffer surface 2221 is between 2mm and 5mm. Preferably, the distance between the second buffer surface 1231 and the first buffer surface 2221 is 2mm. By arranging the distance between the second buffer surface 1231 and the first buffer surface 2221 to be between 2mm and 5mm, the flow of the metal liquid between the buffer surfaces is ensured to be neither too turbulent nor too slow, so as to achieve the best buffering effect, which can ensure the buffering effect and will not affect the normal flow of the metal liquid, further optimizing the production process of the die casting mold.

[0040] As a further improvement of the utility model, the depth of the branch runner 222 is between 10mm and 15mm. Preferably, the depth of the branch runner 222 is 10.99mm. By arranging the depth of the branch runner 222 to be between 10mm and 15mm, the metal liquid can be smoothly flowed into the cavity, and the filling effect and the service life of the mold will not be affected due to excessive depth or shallowness. The metal liquid can flow into the cavity at the most suitable speed and pressure, unnecessary resistance and turbulence are reduced, and the filling effect and product quality are improved.

[0041] As a further improvement of the utility model, the front die core 10 is provided with a liquid injection hole 14, and the liquid injection hole 14 is communicated with the main runner 221. By arranging the liquid injection hole 14 on the front die core 10, and by communicating the liquid injection hole 14 with the main runner 221, it is ensured that the molten metal can smoothly enter the main runner 221 from the external injection equipment through the liquid injection hole 14, the resistance in the injection process is reduced, the injection efficiency is improved, and by communicating the liquid injection hole 14 with the main runner 221, the molten metal can be evenly distributed into each branch runner 222 and the cavity, the situation of local overheating or uneven cooling is avoided, and the quality consistency of the product is ensured.

[0042] As a further improvement of the utility model, the rear die core 20 is provided with a material taking hole 23, and the material taking hole 23 is communicated with the branch runner 222. By arranging the material taking hole 23 on the rear die core 20, and by directly communicating the material taking hole 23 with the branch runner 222, the finished product or residual material can be conveniently taken out after the casting is completed, the taking-out process of the finished product or residual material is significantly simplified, the production efficiency is improved, and the operation time is reduced. In addition, the material taking hole 23 can also discharge excess gas during the casting process, ensure the pressure balance in the cavity, prevent the generation of bubbles, and thus improve the internal quality of the product.

[0043] The technical features of the above embodiments can be combined in any manner, and in order to make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0044] The above embodiments only express the preferred implementation manners of the utility model, the description is more specific and detailed, but it should not be understood as the limitation of the patent application scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A die-casting mold characterized by comprising: The front die core and the rear die core are oppositely arranged; The rear die core is provided with a first workpiece machining part and a flow channel on one side facing the front die core, and the flow channel communicates with the first workpiece machining part; The front die core is provided with a second workpiece machining part and a blocking block on one side facing the rear die core, the second workpiece machining part is mutually engaged with the first workpiece machining part and encloses a die cavity, the blocking block is arranged close to the die cavity, and a gap is arranged between the blocking block and the flow channel.

2. The die casting mold according to claim 1, characterized in that: The blocking block comprises a blocking end, a blocking bottom and a connecting wall, and the blocking bottom is connected with the blocking end through the connecting wall.

3. The die casting mold according to claim 2, characterized in that: The blocking end is arc-shaped.

4. The die casting mold according to claim 2, characterized by: The number of the connecting walls is four, and an arc-shaped chamfer is arranged at the connection of each connecting wall.

5. The die casting mold according to claim 4, characterized in that: The flow channel comprises a main flow channel and a branch flow channel communicating with the main flow channel, and the branch flow channel communicates with the die cavity.

6. The die casting mold according to claim 5, characterized in that: A first buffer surface is arranged at one end of the branch flow channel communicating with the die cavity. The connecting wall comprises a second buffer surface, and the second buffer surface is arranged in parallel with the first buffer surface.

7. The die casting mold according to claim 6, characterized in that: The distance between the second buffer surface and the first buffer surface is between 2mm and 5mm.

8. The die casting mold according to claim 5, characterized in that: The depth of the branch flow channel is between 10mm and 15mm.

9. The die casting mold according to claim 5, characterized in that: A liquid injection hole is arranged on the front die core, and the liquid injection hole communicates with the main flow channel.

10. The die casting mold according to claim 5, characterized in that: A material taking hole is arranged on the rear die core, and the material taking hole communicates with the branch flow channel.

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