Ultra-thin automobile piston mold with double-cavity pouring gate opening structure

Abstract

The utility model relates to the technical field of dies, in particular to an ultra-thin automobile piston die with a double-cavity pouring gate structure, which comprises a base and a piston workpiece, a die mechanism is arranged on the base and comprises a main body component, a lower die holder fixed at the top of the base, a lower cavity mounted at the upper end in the lower die holder, and a lower cavity mounted at the lower end of the lower cavity; an upper mold base is arranged at the upper end of the lower mold base, an upper cavity is formed in the lower end in the upper mold base, pouring ports are fixed to the two ends in the upper mold base, a mold core is fixed to the center of the lower end in the upper mold base, sliding ways are fixed to the lower mold base in the four directions, and sliding blocks are slidably installed in the sliding ways; a double-cavity differential design is adopted, a left cavity strengthening runner ensures complete forming of a stress side structure, a right cavity optimizing runner realizes precise filling of a combustion chamber, an asymmetric cooling system and a multifunctional insert are matched, turbulence is avoided by optimizing a pouring channel, and one-time forming of the asymmetric piston is realized.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, specifically to an ultra-thin automotive piston mold with a double-cavity casting runner structure. Background Technology

[0002] As the automotive industry moves towards lightweighting and high performance, engine pistons, as a core component, are evolving towards thinner walls and higher strength. Modern high-performance engines generally use aluminum alloy pistons to reduce weight, while optimizing structural design to meet increasingly stringent emission standards and fuel efficiency requirements.

[0003] According to CN114799067B, an aluminum piston mold with a single-mold dual-cavity casting structure is disclosed. This technology discloses an aluminum piston mold with a single-mold dual-cavity casting structure, comprising: a right half-mold, wherein a semi-open aluminum molten gate cup is integrally and vertically arranged along the top edge of the center of one side of the right half-mold, and a sprue is longitudinally connected to the bottom of the aluminum molten gate cup; a filter screen is fixedly attached to the lower part of the sprue by a hanging nail; and a left half-mold, wherein a gate stop block is integrally and vertically arranged along the top edge of the center of one side of the left half-mold. The technical solutions, such as "a horizontal runner is provided on the side of the left half outer mold; the aluminum piston blank cavity is vertically and symmetrically provided at the joint ends of the left and right half outer molds", have the following advantages: "The use of a single mold with two cavities can better adapt to the operating efficiency of automated casting machines, effectively reduce the process of aluminum piston blanks, and improve casting production efficiency; the aluminum liquid temperature enters directly through the straight runner and the horizontal runner, with little aluminum temperature loss. At the same time, the filter screen plays a dual role of slag blocking and buffering, thereby ensuring the yield of castings".

[0004] The design of asymmetric pistons is mainly to adapt to the actual working conditions such as the offset layout of the engine combustion chamber, the unidirectional force characteristics of the piston, and tribological optimization. Traditional symmetrical double-cavity molds, due to the use of identical gating systems and cavity structures, can only produce piston workpieces that are completely symmetrical from left to right. They cannot meet the special requirements of modern engines for asymmetric pistons, such as the asymmetric top shape required for the offset design of the combustion chamber, the local thickening structure required for the unidirectional force characteristics, and the differentiated surface features required for tribological optimization. As a result, the production of asymmetric pistons still requires multiple forming processes using single-cavity molds or subsequent machining. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides an ultra-thin automotive piston mold with a dual-cavity casting gate structure. It adopts a differentiated dual-cavity design, with a reinforced flow channel in the left cavity to ensure the complete molding of the stress-bearing side structure, and an optimized flow channel in the right cavity to achieve precise filling of the combustion chamber. Combined with an asymmetric cooling system and multi-functional inserts, the optimized casting channel avoids turbulence, enabling the one-time molding of the asymmetric piston.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an ultra-thin automotive piston mold with a dual-cavity casting runner structure, comprising a base and a piston workpiece, wherein a mold mechanism is provided on the base for molding the piston workpiece, and the mold mechanism includes:

[0007] The main components include a lower mold base fixed to the top of the base, a lower cavity installed at the upper end of the lower mold base, an upper mold base set at the upper end of the lower mold base, an upper cavity installed at the lower end of the upper mold base, pouring ports fixed at both ends of the upper mold base, a core fixed at the center of the lower end of the upper mold base, and slides fixed in four directions inside the lower mold base, with sliders slidably installed inside the slides.

[0008] The auxiliary component includes a movable insert fixed to the upper end of the slider, the top of which has a protrusion that fits into the lower end of the pouring port.

[0009] Preferably, the main component further includes an ingate located at the bottom inner end of the pouring opening, and the outer wall of the protrusion has a flow channel that cooperates with the ingate.

[0010] Preferably, the auxiliary component further includes a mounting bracket fixed to the outer wall of the movable insert in four directions, and a cylinder is mounted on the mounting bracket for driving the slider.

[0011] Preferably, the slide rail is provided with a self-lubricating wear-resistant bushing, and the lubricating wear-resistant bushing and the slider form a sliding fit.

[0012] Preferably, the auxiliary component further includes a wear-resistant pad fixed to the movable insert, and the wear-resistant pad is fixed to the outer end bearing surface of the movable insert.

[0013] Preferably, the mold mechanism further includes a top plate slidably mounted inside the base, and a plurality of ejector pins are mounted on the top plate.

[0014] Beneficial effects

[0015] This invention provides an ultra-thin automotive piston mold with a dual-cavity casting runner structure. Compared with the prior art, it has the following advantages:

[0016] 1. A differentiated dual-cavity casting system is adopted. The left cavity ensures that the molten metal completely fills the reinforced structure on the stress side through a strengthened runner structure and optimized injection process, while the runner angle is adjusted to control the flow of the molten metal. The right cavity uses a gradient cross-section runner with a buffer device to achieve smooth filling of the complex curved surface of the combustion chamber. The movable forming component adopts an asymmetric integrated design, including an extended guide mechanism to ensure positioning accuracy, and integrates a special surface forming unit to achieve the precision forming of all structural features simultaneously within a single mold closing cycle, meeting the manufacturing requirements of asymmetric pistons.

[0017] 2. The ingate and the runner of the protrusion form a smooth transition channel for molten metal, which effectively improves the flow characteristics of molten metal and avoids turbulence and air entrapment; it ensures that no molten metal leakage occurs during the casting process, maintains stable cavity pressure, and is beneficial to the forming of piston workpieces. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a cross-sectional view of the present invention;

[0020] Figure 3 This is a schematic diagram of the internal structure of the mold mechanism in this utility model;

[0021] Figure 4 This is a schematic diagram of the pouring port structure in this utility model.

[0022] In the diagram: 1. Base; 2. Mold mechanism; 21. Main component; 211. Lower mold base; 212. Lower cavity; 213. Upper mold base; 214. Upper cavity; 215. Sprue; 216. Ingate; 217. Core; 218. Slide rail; 219. Slider; 22. Auxiliary component; 221. Movable insert; 222. Protrusion; 223. Mounting bracket; 224. Cylinder; 225. Wear-resistant pad; 23. Top plate; 24. Ejector pin; 3. Piston workpiece. Detailed Implementation

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

[0024] Please see Figure 1 - Figure 4 This utility model provides a technical solution: an ultra-thin automotive piston mold with a double-cavity casting runner structure, including a base 1 and a piston workpiece 3. A mold mechanism 2 is provided on the base 1 for molding the piston workpiece 3. The mold mechanism 2 includes:

[0025] The main component 21 includes a lower mold base 211 fixed to the top of the base 1. A lower cavity 212 is installed at the upper end of the lower mold base 211. An upper mold base 213 is provided at the upper end of the lower mold base 211. An upper cavity 214 is installed at the lower end of the upper mold base 213. A pouring port 215 is fixed at both ends of the upper mold base 213. A core 217 is fixed at the center of the lower end of the upper mold base 213. Slide rails 218 are fixed in four directions inside the lower mold base 211. A slider 219 is slidably installed inside the slide rails 218.

[0026] The auxiliary component 22 includes a movable insert 221 fixed to the upper end of the slider 219. The top of the movable insert 221 is fixed with a protrusion 222 that is adapted to the lower end of the pouring port 215.

[0027] In this embodiment, the left cavity gating port 215 adopts an enhanced flow channel cross section and an optimized injection curve to ensure that the molten metal can completely fill the stress-bearing cavity with reinforcing ribs and locally thickened structures under high pressure. At the same time, the flow direction of the molten metal is controlled by adjusting the angle of the ingate 216. The right cavity gating port 215 uses a specially designed variable cross section flow channel and buffer structure to allow the molten metal to smoothly fill the combustion chamber side cavity with a complex curved surface profile. The two cavities are equipped with independent cooling systems. The stress-bearing side adopts a dense water channel layout to promote rapid solidification, while the combustion chamber side achieves directional solidification through gradient cooling. The movable insert 221 achieves multi-functional integration through asymmetrical arrangement. An extended guide structure is set on one side to ensure the positioning accuracy of the pin hole on the stress side, while a special surface forming unit is integrated on the other side, so that all functional features are completed simultaneously in one mold closing process.

[0028] Specifically, the main component 21 also includes an ingate 216 located at the bottom inner end of the pouring port 215, and the outer wall of the protrusion 222 is provided with a flow channel that cooperates with the ingate 216.

[0029] In this embodiment, a smooth metal liquid transition channel is formed by the inner gate 216 and the runner of the protrusion 222, which effectively improves the flow characteristics of the molten metal and avoids turbulence and air entrapment; it ensures that no metal liquid leakage occurs during the casting process, maintains stable cavity pressure, and is beneficial to the molding of the piston workpiece 3.

[0030] Specifically, the auxiliary component 22 also includes a mounting bracket 223 fixed to the outer wall of the movable insert 221 in four directions. The mounting bracket 223 is equipped with a cylinder 224 for driving the slider 219.

[0031] In this embodiment, the cylinder 224 drives the slider 219 to slide along the slide rail 218. The slider 219 drives the movable insert 221 to be subjected to uniform force during the movement, avoiding the phenomenon of uneven load and jamming.

[0032] Specifically, the slide 218 is equipped with a self-lubricating wear-resistant bushing, and the lubricating wear-resistant bushing and the slider 219 form a sliding fit.

[0033] In this embodiment, the self-lubricating wear-resistant bushing can significantly reduce the frictional resistance of the slider 219 when it reciprocates in the slide 218, ensuring that the core pulling action is smooth and stable.

[0034] Specifically, the auxiliary component 22 also includes a wear-resistant pad 225 fixed on the movable insert 221, and the wear-resistant pad 225 is fixed to the outer end bearing surface of the movable insert 221.

[0035] In this embodiment, the wear-resistant pad 225 can effectively withstand the friction and impact load of the movable insert 221 during the mold opening and closing process, significantly reducing the wear of the working surface of the movable insert 221.

[0036] Specifically, the mold mechanism 2 also includes a top plate 23 that is slidably installed inside the base 1, and a number of ejector pins 24 are installed on the top plate 23.

[0037] In this embodiment, the linear guide rail ensures the smoothness of the movement of the top plate 23 and the repeatability of the positioning accuracy, avoiding the occurrence of uneven load during the ejection process; the uniform arrangement of the ejector pins 24 ensures that the piston workpiece 3 is subjected to balanced force, preventing the thin-walled piston from deforming during the ejection process.

[0038] The working principle and usage process of this utility model are as follows: First, the left cavity gating port 215 adopts an enhanced flow channel cross-section and an optimized injection curve to ensure that the molten metal can completely fill the stress-bearing cavity with reinforcing ribs and locally thickened structures under high pressure. At the same time, the flow direction of the molten metal is controlled by adjusting the angle of the ingate 216. The right cavity gating port 215 uses a specially designed variable cross-section flow channel and buffer structure to allow the molten metal to smoothly fill the combustion chamber side cavity with a complex curved contour. Both cavities are equipped with independent cooling systems. The stress-bearing side adopts a dense water channel layout to promote rapid solidification, while the combustion chamber side is... Gradient cooling achieves directional solidification; the movable insert 221 achieves multi-functional integration through asymmetrical arrangement, with an extended guide structure on one side to ensure the positioning accuracy of the pin hole on the force side, and a special surface forming unit integrated on the other side, so that all functional features are completed simultaneously in one mold closing process; in addition, the ingate 216 and the runner of the protrusion 222 form a smooth metal liquid transition channel, which effectively improves the flow characteristics of molten metal and avoids turbulence and air entrapment; ensuring that no metal liquid leakage occurs during the pouring process, maintaining stable cavity pressure, which is beneficial to the forming of piston workpiece 3.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An ultra-thin automotive piston mold with a dual-cavity casting runner structure, comprising a base (1) and a piston workpiece (3), characterized in that: The base (1) is provided with a mold mechanism (2) for forming a piston workpiece (3). The mold mechanism (2) includes: The main component (21) includes a lower mold base (211) fixed to the top of the base (1), a lower cavity (212) installed at the upper end of the lower mold base (211), an upper mold base (213) provided at the upper end of the lower mold base (211), an upper cavity (214) installed at the lower end of the upper mold base (213), a pouring port (215) fixed at both ends of the upper mold base (213), a core (217) fixed at the center of the lower end of the upper mold base (213), and slide rails (218) fixed in four directions inside the lower mold base (211). A slider (219) is slidably installed inside the slide rails (218). The auxiliary component (22) includes a movable insert (221) fixed to the upper end of the slider (219), the top of the movable insert (221) having a protrusion (222) and being adapted to the lower end of the pouring port (215).

2. The super thin type of automotive piston mold with a runner gate structure of double cavity pouring according to claim 1, characterized in that: The main component (21) also includes an ingate (216) located at the bottom inner end of the pouring port (215), and the outer wall of the protrusion (222) is provided with a flow channel that cooperates with the ingate (216).

3. The super thin type of automotive piston mold with double cavity gating structure according to claim 1, characterized in that: The auxiliary component (22) also includes a mounting bracket (223) fixed to the outer wall of the movable insert (221) in four directions. A cylinder (224) is mounted on the mounting bracket (223) and used to drive the slider (219).

4. The super thin automotive piston mold with double cavity gating structure according to claim 1, characterized in that: The slide (218) is provided with a self-lubricating wear-resistant bushing, and the lubricating wear-resistant bushing and the slider (219) form a sliding fit.

5. The super thin automotive piston mold with double cavity gating structure according to claim 1, characterized in that: The auxiliary component (22) also includes a wear-resistant pad (225) fixed on the movable insert (221), and the wear-resistant pad (225) is fixed to the outer end bearing surface of the movable insert (221).

6. The super thin automotive piston mold with double cavity gating structure according to claim 1, characterized in that: The mold mechanism (2) also includes a top plate (23) that is slidably installed inside the base (1), and a number of ejector pins (24) are installed on the top plate (23).

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