V-shaped cylinder body low-pressure core assembly double-riser tube pouring gravity feeding process and V-shaped cylinder body low-pressure core assembly double-riser tube pouring gravity feeding system

Abstract

The invention relates to a V-shaped cylinder body low-pressure core assembly double-riser tube pouring gravity feeding process and system. The system comprises a pouring riser, an inner pouring gate, a pouring gate, a double liquid lifting pipe and a pushing and inserting plate mechanism. The sprue is divided into a left sprue and a right sprue; the double riser tubes comprise a left pouring riser tube and a right pouring riser tube; molten aluminum rising in the double liquid rising pipes can be collected in a sand bag cavity of the V-shaped cylinder body; the inner gate is positioned at the joint of the top of the double riser tube and the pouring riser; during pouring, the left pouring riser tube and the right pouring riser tube are used for pouring at the same time; the insertion plate pushing mechanism is composed of a fixed air cylinder and an insertion plate; after pouring is finished, the fixed air cylinder pushes the insertion plate to be in place, and the flow gate is sealed; the sand bag with the molten aluminum is overturned by the robot, and gravity feeding solidification is conducted; according to the invention, the temperature loss in the molten aluminum mold filling process can be reduced, the formation of a cold air barrier is avoided, and meanwhile, the mechanical property of the tilting fillet position of the cylinder crankcase meets the technical requirements.

Description

Technical Field

[0001] The invention relates to the field of development and production of V-type engine cylinder blocks, and relates to a V-type cylinder block low-pressure core assembly double-lift liquid tube casting stress compensation shrinkage process and system. Background Art

[0002] The present invention relates to the field of development and production of automotive aluminum alloy V-type casting sleeve cylinder bodies. The production process is sand mold core assembly low-pressure pouring and stress compensation, and is mainly used in the production of low-pressure sand mold aluminum alloy V-type casting sleeve cylinder bodies. The length of the V-type cylinder body is between 380mm and 700mm. The current existing technology uses a single-lift liquid pipe at one end for casting. After the casting is completed, the temperature field of the aluminum water is unevenly distributed, which will cause local hot spots and cold shuts in the cylinder body, which has a great impact on the life and stability of the engine. In severe cases, oil leakage and coolant leakage problems may occur. At present, there is basically no casting technology for V-type aluminum alloy casting sleeve cylinder bodies in the open patent documents. With the development and manufacture of high-performance, high-power, complex inner cavity V-type engine cylinder bodies, the quality of the cylinder body directly affects the engine performance.

[0003] At present, the casting processes adopted internationally for low-pressure sand-type V-type aluminum alloy casting sleeve cylinder blocks are: the first is bottom pouring, in which molten aluminum is poured from the tile seat and the bottom surface, causing overheating at the tile seat position and forming coarse grains that cannot meet the mechanical properties of the engine cylinder block; the second is to use the left and right top surfaces to pour aluminum, and the gates are located at the front and rear end surfaces. For cylinder blocks with larger lengths, molten aluminum pouring from the end surfaces will cause inconsistent aluminum temperature in the cavity, and the flow of molten aluminum in the cavity will cause temperature loss. The aluminum temperature is low away from the gate position, forming a cold air barrier. No leakage will occur at room temperature, but in a hot state, leakage will occur at the cold air barrier position.

[0004] The technical background of the present invention is that the technical requirements of a new type of large-size V-shaped aluminum alloy cylinder with complex inner cavity are water jacket pressure test: under an air pressure of 300kPa, the leakage is not more than 8cm / min, and the cylinder main oil channel pressure test: under an air pressure of 400kPa, the leakage is not more than 10cm / min. At the same time, it is required that the casting is not allowed to have defects such as pores, shrinkage, shrinkage holes, cold shuts, insufficient pouring, etc. In order to meet the technical requirements of the product, a new casting process for the V-shaped cylinder body is studied, which not only ensures the feasibility of the casting process, but also must ensure the relative uniformity of the aluminum water temperature in the cavity. Finally, the low-pressure core group double-riser liquid tube casting technology is determined.

[0005] Patent document 1 (CN101298091A) A low-pressure core assembly casting process for an engine V6 aluminum cylinder body, which is used to cast an automobile engine V6 aluminum cylinder body. A casting process combining low-pressure casting and core assembly is used; firstly, a three-dimensional modeling of the product is performed, and according to the casting shape of the engine V6 aluminum cylinder body, the crankcase is determined to be downward, and the aluminum liquid is poured from the crankcase baffle; the gate position is selected and the gate size is determined; casting simulation software is used to perform casting simulation, analyze the defects that may occur in the casting, and then a process design scheme is formulated based on the analysis results, specifically including: 1) core making; 2) combining each sand core into a sand core group; 3) low-pressure casting. The present invention can produce thin-walled, complex, and high-quality aluminum cylinder castings using a flexible core assembly method according to different engine cylinder body shapes, and is suitable for mass production on an automated production line, so it has the characteristics of low cost, high efficiency, and high pass rate.

[0006] Patent document 2 (CN102091772A) A low-pressure casting method for large castings uses two or more crucible melting and holding furnaces, each furnace has a liquid riser, and the distance between the melting and holding furnaces is adjusted according to the sprue position of the mold. During low-pressure casting, the mold is hung on the low-pressure casting furnace, the low-pressure casting control device is started, and the aluminum liquid enters the mold and maintains pressure at the speed and pressure required by the process to complete the pouring.

[0007] Patent document 3 (CN102091772A) relates to an efficient aluminum alloy investment casting production method, which is characterized in that it includes the following steps: (1) placing an aluminum ingot in a melting furnace, turning on electricity to melt the aluminum ingot, the melting temperature is 730±20℃, and the melting time is 4-5 hours; (2) using a rotary degasser to perform degassing operation, and passing argon gas with a purity of 99% to degas and remove slag; (3) moving the melting furnace to a double-lift tube low-pressure lifter At the bottom, two riser pipes are lowered and extended into the aluminum liquid in the melting furnace. Two strings of preheated mold shells are taken and moved to the double riser pipe low-pressure pouring machine. The gates and riser pipes of the two strings of mold shells are pressed tightly for pouring. After pouring, the pressure is automatically released and the uncast mold shells are replaced. After pouring, the liquid level in the melting furnace drops, and the melting furnace is pressure compensated. (4) The cast mold shell is shelled by a shelling machine to obtain a casting blank with a gate, and the gate is removed to obtain a complete casting. This can improve the pouring efficiency and ensure the high quality and reliability of the casting.

[0008] The above patent documents have low relevance to the present application. Summary of the invention

[0009] The purpose of this application is to design a double-riser tube casting process, in which aluminum is simultaneously introduced from the left and right sides, to ensure that the temperature of the aluminum liquid in the sand bag is uniform and sequential solidification is achieved, and to produce high-quality V-shaped aluminum alloy cylinder blocks, thereby having certain guiding significance for the development and production of low-pressure sand-type V-shaped aluminum alloy casting sleeve cylinder blocks.

[0010] The process of the invention can effectively solve the problem of aluminum liquid temperature field in the sand core, improve the product quality of V-type cylinder body, and provide a V-type aluminum alloy cylinder body low-pressure core assembly double-lift liquid pipe casting stress compensation process and system.

[0011] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0012] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0013] A V-type cylinder low-pressure core assembly double-riser pipe pouring weight compensation system, comprising a pouring riser 2, an inner gate 9, a gate, a double-riser pipe, and a push-insert plate mechanism;

[0014] The gates are divided into a left gate 1-1 and a right gate 1-2;

[0015] The double liquid riser pipes are two liquid riser pipes, namely the left casting liquid riser pipe 6-1 and the right casting liquid riser pipe 6-2; the aluminum liquid rising in the double liquid riser pipes will be collected in the sand bag cavity of the V-shaped cylinder body;

[0016] The inner gate 9 is located at the connection between the top of the double riser pipe and the pouring riser;

[0017] The push-and-insert plate mechanism is composed of a fixed cylinder and an insert plate; after pouring is completed, the fixed cylinder pushes the insert plate into place to seal the inner gate.

[0018] Furthermore, the positions of the left pouring riser pipe 6-1 and the right pouring riser pipe 6-2 are determined according to the dimension between the left and right top surfaces of the V-shaped cylinder body.

[0019] Furthermore, the inner gate is a cylindrical structure. After the low-pressure pouring is completed, the fixed cylinder pushes the plug plate. The sand core position reserves a plug plate space. The plug plate is pushed into the reserved space to seal the inner gate of the cylinder to prevent the aluminum liquid in the cavity from overflowing.

[0020] Further, the center line of the insert plate coincides with the axial direction of the cylinder;

[0021] Furthermore, two sets of the pushing and inserting plate mechanisms are provided.

[0022] A V-type cylinder low-pressure core assembly double-lift liquid pipe casting stress compensation process, comprising the following steps:

[0023] Step 1: Assemble the prepared V-shaped cylinder sand core;

[0024] Step 2: pouring, the left and right pouring riser pipes pour at the same time;

[0025] Step 3: After pouring, the fixed cylinder 7 pushes the plug plate 8 into place to seal the inner gate;

[0026] Step 4: Turn the sand bag over to solidify.

[0027] Furthermore, in step one, the sand bag is combined: the bottom plate core, front and rear end cores, left and right side cores, left and right barrel cores, large cover inner core, and top cover core are combined to form a V-shaped cylinder sand bag.

[0028] Furthermore, in step 2, the robot clamps the sand bag, turns it 180 degrees for pouring, and the left and right pouring riser pipes pour at the same time; aluminum is introduced from the left and right sides at the same time to ensure that the temperature of the aluminum liquid in the sand bag is uniform and achieves sequential solidification.

[0029] Furthermore, after the pouring in step three is completed, the fixed cylinder pushes the plug plate into place to seal the inner gate; a double plug plate design and a double cylinder design are adopted to seal the inner gate.

[0030] Furthermore, in step 4, the robot turns the sand bag 180° to perform gravity shrinkage compensation and solidification.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The invention can reduce the temperature loss during the aluminum liquid filling process, prevent the formation of cold air barriers, and ensure that the mechanical properties of the cylinder crankcase shoe seat position meet the technical requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described below in conjunction with the accompanying drawings:

[0034] Figure 1 This is the anatomical diagram of the low-pressure core double-lift liquid pipe pouring process system;

[0035] Figure 2 This is the overall front view of the low-pressure core assembly double-riser pipe pouring process system;

[0036] Figure 3 It is a side view of the overall low-pressure low-pressure core double riser pipe pouring process system;

[0037] Figure 4 This is a schematic diagram of the sand bag after the core assembly is completed;

[0038] Figure 5 It is a structural schematic diagram of the V-type cylinder low-pressure core assembly double-lift liquid pipe casting stress compensation system of the present invention;

[0039] Figure 6 It is a schematic diagram of the gate, pouring riser and ingate structure;

[0040] In the figure:

[0041] 1-1: Left gate;

[0042] 1-2: right gate;

[0043] 2: Casting riser;

[0044] 3: core sand bag;

[0045] 4: Crucible;

[0046] 5: Furnace cover;

[0047] 6-1: Left pouring riser pipe;

[0048] 6-2: Right pouring riser pipe;

[0049] 7: Fixed cylinder;

[0050] 8: plug board;

[0051] 9: Ingate. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail below in conjunction with the drawings in the embodiment of the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. The embodiments of the present invention are described in detail below in conjunction with the drawings.

[0053] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0054] The present invention is described in detail below in conjunction with the accompanying drawings:

[0055] The present invention provides an embodiment, a V-type cylinder low-pressure core assembly double riser tube low-pressure casting gravity compensation system; including a riser, an inner gate, and a gate, Figure 1 Each structure in the casting realizes the low-pressure pouring process and the inner gate is blocked. Then the sand bag and the casting are turned 180 degrees to realize gravity shrinkage compensation.

[0056] V-type cylinder low-pressure core assembly double riser low-pressure casting focus shrinkage system, using double plug-in mechanism to block the gate technology, the double plug-in mechanism Figure 1 As shown in the figure, it is composed of a fixed cylinder and a plug plate; the double plug plate design and the double cylinder design realize the sealing of the aluminum liquid after the double riser pouring, which is a necessary condition for turning 180° to achieve gravity shrinkage compensation. The "double plug plate mechanism to block the gate technology" means "the fixed cylinder pushes the plug plate into place to seal the gate;" the gate is a cylindrical structure. After the low-pressure pouring is completed, the fixed cylinder pushes the plug plate, and the sand core position reserves the plug plate space. The plug plate can be pushed into the reserved space to block the cylindrical gate to prevent the aluminum liquid in the cavity from overflowing.

[0057] The present invention proposes a low-pressure sand mold V-shaped aluminum alloy casting sleeve cylinder body and a low-pressure casting weight compensation system. Taking the V8TD cylinder body as an example, the principle diagram is as follows: Figure 1 , Figure 2 , Figure 3 ;

[0058] Figure 1 It is a state diagram of the low-pressure pouring process, indicating the double liquid riser and the push-and-plug plate mechanism; Figure 2 This is a front view of the appearance of the low-pressure pouring process; Figure 3 It is a side view of the appearance of the low-pressure pouring process;

[0059] Principle of pouring process:

[0060] Combine the V-shaped cylinder sand cores to form Figure 4 The state shown. Sand bag combination state: combine the bottom plate core, front and rear end cores, left and right side cores, left and right tube barrel cores, large cover inner core, and top cover core to form a V-shaped cylinder sand bag. The robot clamps the sand bag, turns it 180° for pouring, and the double riser pipes are pouring at the same time; the double riser pipes are two riser pipes, the left pouring riser pipe 6-1 and the right pouring riser pipe 6-2; the positions of the left pouring riser pipe 6-1 and the right pouring riser pipe 6-2 are determined according to the size between the left and right top surfaces of the V-shaped cylinder, and there is no connection between the two riser pipes. The rising aluminum liquid in the riser pipes will gather in the sand bag cavity of the V-shaped cylinder. After the pouring is completed, fix the cylinder to push the plug plate into place to seal the inner gate 9; the center line of the plug plate coincides with the axis of the cylinder; the inner gate 9 is located at the connection between the top of the riser pipe and the riser, as shown in the diagram Figure 5 , Figure 6 The robot turns the sand bag 180° to solidify it.

[0061] The present invention provides an embodiment, a V-type cylinder low-pressure core assembly double-lift liquid tube pouring gravity shrinkage compensation process, a V-type cylinder double-lift liquid tube pouring system realizes the pouring of the V-type cylinder, aluminum is simultaneously introduced on the left and right sides to ensure that the temperature of the aluminum liquid in the sand bag is uniform and sequential solidification is achieved, a double plug-in plate mechanism blocks the inner gate to prevent the aluminum liquid from overflowing the cavity, and then the sand bag filled with aluminum liquid is turned over to perform gravity shrinkage compensation.

[0062] The process flow is as follows: sand bag assembly is completed - double riser pipe low-pressure pouring - cylinder pushes the plug plate to seal the aluminum liquid in the gate - robot flips the sand bag with aluminum liquid 180° - gravity shrinkage feeding and solidification.

[0063] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any modification, equivalent replacement and improvement made by any person skilled in the art within the technical scope disclosed by the present invention and within the spirit and principle of the present invention shall be covered within the protection scope of the present invention. At the same time, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A V-type cylinder low-pressure core assembly double-lift pipe casting gravity compensation system, characterized by: It includes pouring riser, inner gate, gate, double liquid riser, and push plate mechanism; The gate is divided into a left gate and a right gate; The double riser pipes are a left pouring riser pipe and a right pouring riser pipe; the aluminum liquid rising in the double riser pipes will be collected in the sand bag cavity of the V-shaped cylinder body; The inner gate is located at the connection between the top of the double riser pipe and the pouring riser; The push-and-insert plate mechanism is composed of a fixed cylinder and an insert plate; after pouring is completed, the fixed cylinder pushes the insert plate into place to seal the inner gate.

2. A V-type cylinder low-pressure core assembly double-lift pipe casting gravity compensation system according to claim 1, characterized in that: The positions of the left pouring riser pipe and the right pouring riser pipe are determined according to the dimension between the left and right top surfaces of the V-shaped cylinder body.

3. A V-type cylinder low-pressure core assembly double-lift pipe casting stress compensation system according to claim 1, characterized in that: The inner gate is a cylindrical structure. After the low-pressure pouring is completed, the fixed cylinder pushes the plug plate. The space for the plug plate is reserved at the sand core position. The plug plate is pushed into the reserved space to seal the inner gate of the cylinder to prevent the aluminum liquid in the cavity from overflowing.

4. A V-type cylinder low-pressure core assembly double-lift pipe casting gravity shrinkage compensation system according to claim 1, characterized in that: The center line of the insert plate coincides with the axial direction of the cylinder.

5. A V-type cylinder low-pressure core assembly double-lift pipe casting gravity compensation system according to claim 1, characterized in that: The pushing and inserting plate mechanism is provided with two sets.

6. A V-type cylinder low-pressure core assembly double-lift pipe casting stress compensation process, characterized in that: The following steps are involved: Step 1: Assemble the prepared V-shaped cylinder sand core; Step 2: pouring, the left and right pouring riser pipes pour at the same time; Step 3: After pouring, fix the cylinder to push the plug plate into place and seal the inner gate; Step 4: Turn the sand bag over to solidify.

7. A V-type cylinder low-pressure core assembly double-lift pipe casting stress compensation process according to claim 6, characterized in that: The sand bag combination state in step one: combine the bottom plate core, front and rear end cores, left and right side cores, left and right barrel cores, large cover inner core, and top cover core to form a V-shaped cylinder sand bag.

8. A V-type cylinder low-pressure core assembly double-lift liquid pipe casting stress shrinkage compensation process according to claim 6, characterized in that: In step 2, the robot clamps the sand bag, turns it 180 degrees for pouring, and pours at the same time through the left and right pouring riser pipes; aluminum is introduced from both sides at the same time to ensure that the temperature of the aluminum liquid in the sand bag is uniform and achieves sequential solidification.

9. A V-type cylinder low-pressure core assembly double-lift pipe casting stress-feeding shrinkage process according to claim 6, characterized in that: After the pouring in step 3 is completed, the fixed cylinder pushes the plug plate into place to seal the inner gate; a double plug plate design and a double cylinder design are adopted to seal the inner gate.

10. A V-type cylinder low-pressure core assembly double-lift pipe casting stress-feeding shrinkage process according to claim 6, characterized in that: In step 4, the robot turns the sand bag 180° to perform gravity shrinkage and solidification.

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