A group tree structure with product shrinkage bars

Abstract

The utility model relates to the technical field of group tree structure, concretely relates to a kind of group tree structure with product feeding strip, model wax module, the model wax module has the same outer contour with product;Gate wax module, including gate portion and runner portion, the model wax module is adhered in the end portion of runner portion away from gate portion;Feeding strip wax module, adhere in the model wax module of corresponding product prone to defect, and located the side of model wax module close to gate portion.The thickness of the relatively thick place of feeding strip wax module corresponding model wax module in it is greater than the thickness of other places of feeding strip wax module body, the width of the relatively thick place of feeding strip wax module corresponding model wax module in it is greater than the width of other places of feeding strip wax module body.A kind of group tree structure with product feeding strip in the utility model, including model wax module, gate wax module, feeding strip wax module, the problem of low yield in prior art is well solved.

Description

Technical Field

[0001] This utility model relates to the field of tree structure technology, and in particular to a tree structure with product shrinkage strips. Background Technology

[0002] Investment casting includes processes such as wax pressing, tree assembly, shell making, dewaxing and baking, casting, and post-processing. The specific process is as follows: First, wax models are made, and wax is injected into the mold to form a wax model that matches the shape of the casting. Then, multiple wax models are combined into a module. Next, paint is applied and sand is sprinkled to form a multi-layered refractory shell. Then, the wax model is heated and melted to obtain a hollow shell. After the shell is baked at high temperature, molten metal is poured in. After the metal solidifies, the shell is removed, the gating and riser are cleaned, and the casting is obtained after grinding and polishing.

[0003] In the prior art, near-net-shape casting is usually used to produce high-temperature titanium-aluminum alloy blades. This method reduces the subsequent machining allowance and shortens the subsequent machining time. However, due to the reduction of the allowance, defects such as shrinkage porosity, shrinkage cavity and gas porosity, which are common in investment casting, are more likely to appear on the surface of the product, resulting in a decrease in the yield of the product. Now, a tree structure with product shrinkage compensation strips is proposed to solve the problems existing in the prior art. Utility Model Content

[0004] The purpose of this invention is to provide a tree structure with product shrinkage strips to solve the problem that the existing technology usually uses near-net-shape casting to produce high-temperature titanium-aluminum alloy blades. This method leads to defects such as shrinkage porosity, shrinkage cavities, and gas pores, which are common in investment casting, easily appearing on the surface of the product, resulting in a decrease in the yield rate of the product.

[0005] The technical solution of this utility model is: a tree structure with product shrinkage strips, including: a model wax module, wherein the model wax module has the same outer contour as the product; The gating wax module includes a gate section and a runner section, wherein the model wax module is adhered to the end of the runner section away from the gate section; The shrinkage compensation wax module is attached to the model wax module that is prone to defects in the corresponding product, and is located on the side of the model wax module near the gate.

[0006] Preferably, the thickness of the thicker part of the shrinkage strip wax module corresponding to the model wax module is greater than the thickness of other parts of the shrinkage strip wax module body, and the width of the thicker part of the shrinkage strip wax module corresponding to the model wax module is greater than the width of other parts of the shrinkage strip wax module body.

[0007] Preferably, the model wax module is in the shape of a twisted blade, and the model wax module includes a blade root that is adhered to the flow channel, a blade body located in the middle section, and a tail edge at the outermost end.

[0008] Preferably, the shrinkage strip wax module is long and strip-shaped and is adhered to the torsion line on the outer convex surface of the blade.

[0009] Preferably, the cross-section of the shrinkage strip wax module is trapezoidal in shape, wherein the side in contact with the leaf body is shorter than the side away from the leaf body.

[0010] Preferably, the top of the shrinkage wax module is provided with a wide and thick portion that is wider and thicker than the body of the shrinkage wax module.

[0011] Preferably, the flow channel is cross-shaped and includes four flow channel branches that are connected to the gating gate and have the same structure, and each flow channel branch is flat.

[0012] Preferably, two model wax modules are adhered to the lower end face of each runner branch at the end furthest from the sprue, and a shrinkage strip wax module is adhered to each model wax module.

[0013] Compared with the prior art, the advantages of this utility model are: This utility model discloses a tree structure with product shrinkage strips, including a model wax module, a sprue wax module, and a shrinkage strip wax module. In the actual investment casting of titanium-aluminum alloy blades, this tree structure with product shrinkage strips involves placing the mold on a centrifugal casting device to pour molten metal. Simultaneously, the mold rotates with its vertical centerline as a reference, and the molten metal forms shrinkage strips and blades. Under centrifugal force, the distal end of the mold is preferably filled. Since the shrinkage strip wax module is located on the side of the model wax module near the sprue, defects such as shrinkage porosity, shrinkage cavities, and air holes are concentrated in the shrinkage strip. The blades located at the distal end have good metallurgical quality, effectively solving the problem of low yield in existing technologies. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of a tree structure with product shrinkage strips according to the present invention; Figure 2 This is a schematic diagram of the tree structure with product shrinkage strips described in this utility model from an upward perspective; Figure 3 for Figure 1 Front view; Figure 4 This is a schematic diagram of the structure of the shrinkage strip wax module of this utility model being adhered to the model wax module; Figure 5 This is a schematic diagram of the structure of the model wax module described in this utility model; Figure 6 for Figure 4Schematic diagram of the cross-sectional structure at point AA; Figure 7 This is a schematic diagram of the structure of the shrinkage compensation strip described in this utility model.

[0015] The components are: 1. Model wax module, 2. Sprue wax module, 3. Compensating strip wax module, 4. Gate section, 5. Runner section, 6. Leaf root, 7. Leaf body, 8. Tail edge, 9. Thick section, 10. Runner branch, 11. Compensating strip, 12. Cutting line, 13. Twist line. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to specific embodiments: In the description of the utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0017] like Figures 1-3 As shown, a tree structure with a product shrinkage strip 11 includes: a model wax module 1, which has the same outer contour as the product; a runner wax module 2, including a gate portion 4 and a runner portion 5, wherein the model wax module 1 is adhered to the end of the runner portion 5 away from the gate portion 4; and a shrinkage strip wax module 3, which is adhered to the model wax module 1 corresponding to the area of ​​the product prone to defects by adhesive wax, and is located on the side of the model wax module 1 near the gate portion 4. The thickness of the shrinkage strip wax module 3 corresponding to the thicker part of the model wax module 1 is greater than the thickness of other parts of the body of the shrinkage strip wax module 3, and the width of the shrinkage strip wax module 3 corresponding to the thicker part of the model wax module 1 is greater than the width of other parts of the body of the shrinkage strip wax module 3; in this embodiment, as... Figure 6 As shown, the thickness of the shrinkage strip wax module 3 is M, and the width is H.

[0018] like Figures 4-6 As shown, the model wax module 1 is in the shape of a twisted blade. Model wax module 1 includes a blade root 6 adhered to the flow channel 5, a blade body 7 located in the middle section, and a trailing edge 8 at the outermost end. The shrinkage strip wax module 3 is long and strip-shaped, and is adhered to the twist line on the outer convex surface of the blade body 7 (which is also the thickest part of the blade body 7). The twist line is as follows... Figure 4 As shown, the shrinkage compensation wax module 3 can be in the form of a strip, or it can be in other structures such as a ring, cylinder, or branch. Any structure designed for shrinkage compensation should be within the scope of protection of this application. Figure 6As shown, the cross-section of the shrinkage wax module 3 is trapezoidal in shape, with the side in contact with the blade 7 being shorter than the side away from the blade 7. This increases the volume of the filling metal in the shrinkage wax module 3, allowing for better transfer of defects such as shrinkage porosity, shrinkage cavities, and blowholes in the blade.

[0019] The top of the shrinkage compensation wax module 3 is provided with a wide and thickened portion 9, which is wider and thicker than the main body of the shrinkage compensation wax module 3. Since the part of the blade 7 corresponding to the wide and thickened portion 9 is relatively thick, the larger volume of the wide and thickened portion 9 can better transfer defects such as shrinkage porosity, shrinkage cavities, and blowholes in the blade. The runner section 5 is generally cross-shaped, including four runner branches 10 that are connected to the sprue and have the same structure. Each runner branch 10 is flat. Two model wax modules 1 are glued to the lower end face of the end of each runner branch 10 away from the sprue, and one shrinkage compensation wax module 3 is glued to each model wax module 1.

[0020] The specific application of a tree structure with product feeding strips 11 in actual production of this utility model is as follows: Step 1: Find the area in the blade that is prone to defects by using investment casting mold flow analysis software, and design the shape of the feeding strips 11 according to the area. Step 2: Design the shape of the shrinkage strip wax module 3 by using the strip shape of the shrinkage strip 11; the shrinkage strip wax module 3 is a wax model with the outer contour of the shrinkage strip 11; Step 3: Design model wax module 1 according to the shape of the leaf, and fix the shrinkage strip wax module 3 onto model wax module 1 by adhesive wax; Step 4: Attach multiple model wax modules 1 with the attached shrinkage strip wax module 3 to the gating wax module 2 to complete the tree assembly and obtain the tree structure in this utility model. Step 5: Apply slurry to the tree structure, then melt wax and fire it to obtain the mold; Step Six: Place the mold on a centrifugal casting device to cast molten metal. While casting, the mold rotates with its vertical centerline as the reference, and the molten metal forms the feeding strip 11 and blades. Under the action of centrifugal force, the far end of the mold is preferred during the casting process. Since the feeding strip wax module 3 is located on the side of the model wax module 1 near the gate 4, defects such as shrinkage porosity, shrinkage cavities and gas pores are gathered in the feeding strip 11, and the blades located at the far end have good metallurgical quality. Step 7: After casting is completed, the shrinkage compensation strip 11 is cut along the wire cutting line using a wire cutting device. Figure 7 After cutting off part of the cutting line 12, hot isostatic pressing is performed; part of the shrinkage compensation strip 11 is cut off to achieve a better hot isostatic pressing effect on the blade. Step 8: After hot isostatic pressing, cut the remaining shrinkage strip 11 using a wire cutting machine, and then use a grinder to grind the blade to the specified size.

[0021] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore, all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within this utility model.

Claims

1. A tree structure with product shrinkage strips, characterized in that, include: A model wax module having the same outer contour as the product; The gating wax module includes a gate section and a runner section, wherein the model wax module is adhered to the end of the runner section away from the gate section; The shrinkage compensation wax module is attached to the model wax module that is prone to defects in the corresponding product, and is located on the side of the model wax module near the gate.

2. A tree structure with product shrinkage strips according to claim 1, characterized in that: The thickness of the thicker part of the shrinkage wax module corresponding to the model wax module is greater than the thickness of other parts of the shrinkage wax module body, and the width of the thicker part of the shrinkage wax module corresponding to the model wax module is greater than the width of other parts of the shrinkage wax module body.

3. A tree structure with product shrinkage strips according to claim 1, characterized in that: The model wax module is in the shape of a twisted blade, and includes a blade root that is adhered to the flow channel, a blade body located in the middle section, and a tail edge at the outermost end.

4. A tree structure with product shrinkage strips according to claim 3, characterized in that: The shrinkage wax module is long and sticks to the twist line on the outer convex surface of the blade.

5. A tree structure with product shrinkage strips according to claim 3, characterized in that: The cross-section of the shrinkage strip wax module is trapezoidal in shape, wherein the side in contact with the leaf body is shorter than the side away from the leaf body.

6. A tree structure with product shrinkage strips according to claim 1, characterized in that: The top of the shrinkage wax module is provided with a wide and thick part that is wider and thicker than the body of the shrinkage wax module.

7. A tree structure with product shrinkage strips according to claim 1, characterized in that: The flow channel section is cross-shaped and includes four flow channel branches that are connected to the gating gate and have the same structure. Each flow channel branch is flat.

8. A tree structure with product shrinkage strips according to claim 7, characterized in that: Two model wax modules are glued to the lower end face of each runner branch, the end furthest from the sprue. Each model wax module has a shrinkage strip wax module glued to it.

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