Casting structure for precisely casting turbocharger valve arm

Abstract

The utility model relates to a casting structure for precisely casting a turbocharger valve arm, which comprises a die head and a die structure matched with the die head, and the die structure comprises an upper die and a lower die which are matched with each other; the upper product pouring cavity and the lower product pouring cavity form a group of parallel product pouring cavities, the upper sprue structure and the lower sprue structure form a group of parallel left and right sprues, and the left and right sprues are communicated through a connecting groove, so that the left and right sprues form a communicated common sprue; the die head is communicated with the left and right sprues, and the joints of the die head and the left and right sprues are arranged at the edges of one sides of the upper and lower dies. When in use, the common pouring gate not only enables the pouring to be more convenient and quicker, but also can greatly reduce the time for taking the mold, effectively increases the contact area between the pouring gate and the mold head, and ensures the pouring quality.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, specifically to a casting structure for precision casting of a turbocharger valve arm, and more particularly to a casting structure for improving the production efficiency of precision investment casting of automobile accessory valve arms. Background Art

[0002] At present, in order to pursue high quality, high surface finish and less machining allowance in the production and casting process, the parts of the bleed valve system of some automobile turbochargers are all made by precision casting. The bleed valve is generally a part of a few grams to dozens of grams. In order to increase production efficiency, multiple parts are usually combined with a gating system to form a string, and a runner is set at a certain part of the part to connect with the gating system.

[0003] The investment casting process is to first press a wax mold similar to the part shape, then coat the surface of the wax part with refractory material, and then melt the wax mold through a steam dewaxing kettle to form wax water. Due to the different expansion coefficients of wax and refractory material, the unreasonable setting of the gate will cause the entire string of products to be scrapped.

[0004] Conventional foundries design the gate of cover plate parts in the center of the plate surface. The wax in the cover plate part structure below the gate position cannot be completely discharged. The carbide and ash produced by the residual wax after roasting will cause defects such as slag holes and debris during pouring, thus affecting the surface and internal quality of the casting.

[0005] Therefore, the market is in urgent need of a new casting structure that can solve the above problems to improve product quality and reduce costs. Summary of the Invention

[0006] The purpose of the utility model is to provide an improved casting structure for precision casting of a turbocharger valve arm, which reduces the mold removal time and improves the casting quality through structural improvement.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: a casting structure for precision casting of a turbocharger valve arm, characterized in that: the casting structure includes a die head and a mold structure cooperating with the die head, the mold structure includes an upper mold and a lower mold cooperating with each other; a group of product upper pouring cavities and an upper gate structure connected to the product upper pouring cavities are provided in the upper mold, and a group of product lower pouring cavities cooperating with the product upper pouring cavities, and a lower gate structure cooperating with the upper gate structure are provided in the lower mold; the product upper pouring cavity and the product lower pouring cavity form a group of parallel product pouring cavities, the upper gate structure and the lower gate structure form a group of parallel left and right gates, and the left and right gates are connected by a connecting groove, so that the left and right gates form a connected common gate; the die head is connected to the left and right gates, and the connection between the die head and the left and right gates is set at the side edge of the upper and lower molds.

[0008] Preferably, both the left and right gates are provided with a pouring cavity, the pouring cavity and the product pouring cavity are connected by a trumpet-shaped pouring channel, and a contraction channel is provided between the pouring channel and the product pouring cavity; the bottom of the connecting groove is in the shape of an inward convex arc, and a guide strip is arranged at the bottom of the connecting groove.

[0009] Furthermore, the connecting groove is connected to the left and right gates via an eight-shaped groove, and both side walls of the eight-shaped groove are symmetrically concave arc-shaped.

[0010] Furthermore, the working surface of the lower mold is provided with two mold guide pillars, the working surface of the upper mold is provided with guide pillar holes corresponding to the mold guide pillars, and mold opening grooves are provided at the four corners of the working surface of the upper mold.

[0011] Furthermore, the die head is divided into a single component and a tree-shaped component. The single-component die head includes a die casting port, which is connected to the left and right gates; the tree-shaped component die head includes a die casting port and two parallel runners connected to the die casting port. Several groups of discharge ports are symmetrically arranged on each runner, and the two ends of each group of discharge gates are respectively connected to the two groups of left and right gates.

[0012] Furthermore, each runner has 3-6 groups of discharge ports evenly distributed from top to bottom. The discharge ports are cylindrical, and the left or right gate is sleeved in the discharge port. A discontinuous positioning inner ring is provided along the inner wall of the discharge port to limit the insertion depth of the left and right gates.

[0013] Furthermore, the die casting port is conical in shape, with an arc bottom, and reinforcing ribs are provided between the die casting port and the two runners.

[0014] Compared with the prior art, the technical solution of the present invention not only improves the overall technical solution, but also includes many improvements in details. Specifically, it has the following beneficial effects:

[0015] 1. The improved solution of the utility model comprises a casting structure including a die head and a mold structure matched with the die head. The mold structure comprises an upper mold and a lower mold matched with each other. The left and right gates are connected by a connecting groove, so that the left and right gates form a connected common gate. When the number of molds to be ejected and the wax injection time are inconvenient, the mold removal time can be greatly shortened, thereby effectively improving production efficiency.

[0016] 2. In the technical solution of the utility model, the tree-shaped component die head includes a die casting port and two parallel runners connected to the die casting port. Each runner is symmetrically provided with several groups of discharge ports. The two ends of each group of discharge ports are respectively connected to two groups of left and right gates. The tree-shaped component die head with this structure not only reduces the operation time of the array, but also increases the material yield by 1.3%, saving costs and improving product quality.

[0017] 3. In the structure of the utility model, the die head is connected to the left and right gates, and the connection between the die head and the left and right gates is set at the edge of one side of the upper and lower molds, so that the wax at the gate position can be completely discharged, avoiding defects such as slag holes and debris during pouring, and improving the quality of the surface and interior of the casting;

[0018] 4. The utility model has a simple structure, reasonable layout, easy use, and is easy to promote and utilize. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of the utility model in which the gate is connected to the product cavity.

[0020] Figure 2 This is a schematic structural diagram of an embodiment of the utility model in use.

[0021] Figure 3 This is a schematic diagram of the upper mold structure of the present utility model.

[0022] Figure 4 It is a structural schematic diagram of the lower mold of the utility model.

[0023] Figure 5 This is a schematic structural diagram of a die head in one embodiment of the present invention.

[0024] Figure 6 This is a schematic structural diagram of another embodiment of the present invention in use state.

[0025] Reference numerals:

[0026] 1 upper mold, 2 lower mold, 3 left gate, 4 right gate, 5 connecting groove, 6 pouring channel, 7 shrink channel, 8 die head;

[0027] 11 product upper pouring cavity, 12 upper gate structure, 13 guide post hole, 14 mold opening groove;

[0028] 21 product lower pouring cavity, 22 lower gate structure, 23 mold guide column;

[0029] 81 reinforcement ribs. DETAILED DESCRIPTION

[0030] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0031] The utility model provides a casting structure for precision casting turbocharger valve arm, see Figure 1The difference between it and the prior art is that the casting structure includes a die head 8 and a mold structure that cooperates with the die head, and the mold structure includes an upper mold 1 and a lower mold 2 that cooperate with each other; here, one die head can cooperate with one mold structure, or one die head can cooperate with multiple stacked mold structures.

[0032] Specifically, the upper mold 1 is provided with a group of product upper pouring cavities 11 and an upper gate structure 12 connected to the product upper pouring cavities, and the lower mold 2 is provided with a group of product lower pouring cavities 21 cooperating with the product upper pouring cavities, and a lower gate structure 22 cooperating with the upper gate structure; the product upper pouring cavity and the product lower pouring cavity constitute a group of parallel product pouring cavities, and the upper gate structure and the lower gate structure constitute a group of parallel left and right gates 3 and 4. The left and right gates are connected by a connecting groove 5, so that the left and right gates form a connected common gate. The shared gate not only makes pouring more convenient and quick, but also greatly reduces the time for demolding, and effectively increases the contact area between the gate and the die head, thereby ensuring the quality of casting; the die head is connected to the left and right gates, and the connection between the die head and the left and right gates is set at the edge of one side of the upper and lower molds, so that the wax at the gate position can be completely discharged, avoiding defects such as slag holes and debris during pouring, and improving the surface and internal quality of the casting.

[0033] Example 1

[0034] In this embodiment, Figure 2-4 As shown, a die head is matched with a mold structure, and the upper pouring cavity of the product and the lower pouring cavity of the product form a group of parallel product pouring cavities. The upper gate structure and the lower gate structure form a group of parallel left and right gates. The left and right gates are connected by a connecting groove, so that the left and right gates form a connected common gate. The shared gate not only makes pouring more convenient and quick, but also greatly reduces the time of mold removal, and effectively increases the contact area between the gate and the die head, ensuring the quality of casting.

[0035] Specifically, by sharing a single sprue for both parts, the time it takes for the wax injection operator to remove the mold from the runner can be cut in half compared to the original design. Furthermore, during the four-hour cooling period after the wax injection, the parts can be left standing upright without any deformation.

[0036] Furthermore, both the left and right gates have pouring cavities, connected to the product pouring cavity via a trumpet-shaped pouring channel 6. A constriction channel 7 is provided between the pouring channel and the product pouring cavity. The bottom of the connecting groove is an inward-convex arc, and a guide strip is arranged at the bottom of the connecting groove. The connecting groove 5 is connected to the left and right gates via an eight-shaped groove, the two side walls of which are symmetrically concave arcs.

[0037] Furthermore, the working surface of the lower mold 2 is provided with two mold guide pillars 23, the working surface of the upper mold 1 is provided with guide pillar holes 13 corresponding to the mold guide pillars, and mold opening grooves 14 are provided at the four corners of the working surface of the upper mold.

[0038] Furthermore, the die head 8 is a single-component die head, including a die head casting port, which is connected to the left and right gates; the die head casting port is conical with an arc bottom, and a reinforcing rib 81 is provided between the die head casting port and the two runners.

[0039] Example 2

[0040] In this embodiment, see Figure 4 、 5 , one die head is matched with multiple stacked mold structures. Specifically, the upper mold 1 is provided with a group of product upper pouring cavities 11 and an upper gate structure 12 connected to the product upper pouring cavities, and the lower mold 2 is provided with a group of product lower pouring cavities 21 cooperating with the product upper pouring cavities, and a lower gate structure 22 cooperating with the upper gate structure; the product upper pouring cavity and the product lower pouring cavity constitute a group of parallel product pouring cavities, and the upper gate structure and the lower gate structure constitute a group of parallel left and right gates 3 and 4. The left and right gates are connected by a connecting groove 5, so that the left and right gates form a connected common gate. The shared gate not only makes pouring more convenient and quick, but also greatly reduces the time for demolding, and effectively increases the contact area between the gate and the die head, thereby ensuring the quality of casting; the die head 8 is connected to the left and right gates, and the connection between the die head and the left and right gates is arranged at the edge of one side of the upper and lower molds, so that the wax at the gate position can be completely discharged, avoiding defects such as slag holes and debris during pouring, and improving the surface and internal quality of the casting.

[0041] Furthermore, in the tree assembly process, merging the previous two products into one product can reduce the tree assembly time by half. If the original design is to assemble 36 pieces in a string, it is now equivalent to assembling 18 pieces in a string, which speeds up the operator's production efficiency.

[0042] Furthermore, both the left and right gates have pouring cavities, connected to the product pouring cavity via a trumpet-shaped pouring channel 6. A constriction channel 7 is provided between the pouring channel and the product pouring cavity. The bottom of the connecting groove is in the shape of an inwardly convex arc, and a guide strip is arranged at the bottom of the connecting groove. The connecting groove is connected to the left and right gates via an eight-shaped groove, the two side walls of which are symmetrically concave arcs.

[0043] The tree-shaped component die consists of a die casting gate and two parallel runners connected to it. Each runner has several symmetrical groups of discharge ports, each of which connects to two groups of left and right gates at both ends. Each runner has 3-6 groups of discharge ports evenly distributed from top to bottom. The discharge ports are cylindrical, with the left or right gate nestled within them. Discontinuous positioning rings are installed along the inner wall of the discharge ports to limit the insertion depth of the left and right gates.

[0044] The advantages of this utility model are as follows:

[0045] 1. The improvement scheme of the utility model reduces the time for the operator to remove the mold by combining and improving the gates of the two products while keeping the number of molds and wax injection time unchanged.

[0046] 2. The technical solution of this utility model is combined with the special die head to form the tree, which reduces the operator's tree forming working hours and improves the material yield by 1.3% compared with the original solution;

[0047] 3. The structural design of the utility model is ingenious and reasonable, which increases the contact surface between the gate and the die head and effectively reduces the chance of wax mold tree falling off during the shell making process.

[0048] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to the above description. For those skilled in the art of the present invention, without departing from the concept of the present invention, they can make several simple deductions or substitutions, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A casting structure for precision casting a turbocharger valve arm, characterized by: The casting structure includes a die head and a mold structure cooperating with the die head, and the mold structure includes an upper mold and a lower mold cooperating with each other; a group of product upper pouring cavities and an upper gate structure connected to the product upper pouring cavities are provided in the upper mold, and a group of product lower pouring cavities cooperating with the product upper pouring cavities and a lower gate structure cooperating with the upper gate structure are provided in the lower mold; the product upper pouring cavity and the product lower pouring cavity form a group of parallel product pouring cavities, and the upper gate structure and the lower gate structure form a group of parallel left and right gates, which are connected by a connecting groove, so that the left and right gates form a connected common gate; the die head is connected to the left and right gates, and the connection between the die head and the left and right gates is set at the edge of one side of the upper and lower molds.

2. The casting structure for precision casting a turbocharger valve arm according to claim 1, characterized in that: Both the left and right gates are provided with a pouring cavity, which is connected to the product pouring cavity through a trumpet-shaped pouring channel, and a contraction channel is provided between the pouring channel and the product pouring cavity; the bottom of the connecting groove is in an inward convex arc shape, and a guide strip is arranged at the bottom of the connecting groove.

3. The casting structure for precision casting a turbocharger valve arm according to claim 2, characterized in that: The connecting groove is connected to the left and right gates through an eight-shaped groove, and the two side walls of the eight-shaped groove are symmetrically concave arc-shaped.

4. The casting structure for precision casting a turbocharger valve arm according to claim 1, characterized in that: The working surface of the lower mold is provided with two mold guide pillars, the working surface of the upper mold is provided with guide pillar holes corresponding to the mold guide pillars, and mold opening grooves are provided at the four corners of the working surface of the upper mold.

5. The casting structure for precision casting a turbocharger valve arm according to claim 1, characterized in that: The die head is divided into a single component and a tree-shaped component. The single-component die head includes a die casting port, which is connected to the left and right gates; the tree-shaped component die head includes a die casting port and two parallel runners connected to the die casting port. Several groups of discharge ports are symmetrically arranged on each runner, and the two ends of each group of discharge gates are respectively connected to the two groups of left and right gates.

6. The casting structure for precision casting a turbocharger valve arm according to claim 5, characterized in that: Each runner has 3-6 groups of discharge gates evenly distributed from top to bottom. The discharge gate is cylindrical, and the left gate or the right gate is sleeved inside the discharge gate. A discontinuous positioning inner ring is provided along the inner wall of the discharge gate to limit the insertion depth of the left and right gates.

7. The casting structure for precision casting a turbocharger valve arm according to claim 5, characterized in that: The die casting port is conical in shape, with an arc bottom, and reinforcing ribs are provided between the die casting port and the two runners.

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