Control valve body pouring fired mold structure
By designing a control valve body casting and injection mold structure including a straight die head, a transverse die head and a front die head, the problems of low casting yield and shrinkage defects in the prior art are solved, and efficient and uniform casting and quality assurance are achieved.
Patent Information
- Application Number
- CN202421947681.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-08-12
AI Technical Summary
The casting process yield of the existing control valve body is relatively low, and due to the complex structure and multiple thermal sections, the casting cost remains high, and it is difficult to avoid shrinkage defects.
A control valve body casting investment structure is designed, including a straight die head wax mold, a horizontal die head wax mold and a front die head wax mold. A stable wax mold and shell mold structure is assembled through the wax mold assembly welding process to ensure the uniformity of the pouring of the steel, and the filling capacity of the casting mold is enhanced by subsidizing the wax mold.
The casting yield rate of the control valve body is improved, the quality of the casting is ensured, the occurrence of shrinkage defects is reduced, the labor intensity of workers is significantly reduced, and the casting cost is reduced.
Smart Images
Figure CN222957442U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of control valve body casting, in particular to a pouring investment structure for a control valve body.
Background Art
[0002] Investment casting, also known as lost-wax casting, can produce castings with high dimensional accuracy, high surface finish and complex shapes. For example, control valve bodies generally adopt investment casting.
[0003] A control valve is an actuator in an automatic control system, and the application quality thereof directly reflects on the regulation quality of the system. As a terminal element in process control, people's understanding of its importance has been updated compared with the past. The quality of the application of a control valve is directly related to the quality of the product itself.
[0004] After casting and processing, the control valve body is required to be 100% ray (RT) detected and needs to be subjected to a hydrostatic test without leakage. Therefore, shrinkage porosity defects are not allowed in the casting. Moreover, due to the relatively complex structure of the control valve body and many casting hot spots, in order to ensure the quality, the casting process yield of the existing control valve bodies is relatively low, resulting in high casting costs.
[0005] In view of the above problems, we need to redesign the pouring investment structure of the control valve body to improve the casting yield of the control valve body and ensure the quality of the casting. For this, we provide a new technical solution.
Content of the Utility Model
[0006] The utility model aims to solve at least one of the technical problems existing in the prior art. For this, the utility model provides a pouring investment structure for a control valve body, and the technical solution adopted is as follows:
[0007] A pouring investment structure for a control valve body includes a control valve body wax pattern and a pouring mold head wax pattern. The pouring mold head wax pattern includes a straight mold head wax pattern, a pair of transverse mold head wax patterns respectively extending laterally from both sides of the straight mold head wax pattern, and a front mold head wax pattern extending from the front end of the straight mold head wax pattern. The bottom of the straight mold head wax pattern is connected to the middle part of the valve pipe of the control valve body wax pattern. The pair of transverse mold head wax patterns are respectively connected to the flanges at both ends of the valve pipe of the control valve body wax pattern. The front mold head wax pattern is connected to the top of the thread seat of the control valve body wax pattern.
[0008] According to an embodiment of the utility model, the pouring mold head wax pattern further includes a sprue cup wax pattern integrally formed with the straight mold head wax pattern at the top of the straight mold head wax pattern.
[0009] According to an embodiment of the utility model, a middle gate mold head is connected between the bottom of the straight mold head wax pattern and the middle part of the valve pipe of the control valve body wax pattern.
[0010] A pouring investment mold structure of a control valve body according to an embodiment of the present invention, an internal gate mold head is connected between the horizontal mold head wax mold and the two end flanges of the control valve body wax mold.
[0011] A pouring investment mold structure of a control valve body according to an embodiment of the present invention, exhaust wax bars are respectively connected between the upper end of the straight mold head wax mold and the horizontal mold head wax molds on both sides thereof.
[0012] A pouring investment mold structure of a control valve body according to an embodiment of the present invention, the middle gate mold head and the bottom of the straight mold head wax mold, and the middle part of the valve pipe of the control valve body wax mold are respectively assembled together by wax mold group welding process.
[0013] A pouring investment mold structure of a control valve body according to an embodiment of the present invention, the internal gate mold head and the horizontal mold head wax mold, and the two end flanges of the control valve body wax mold are respectively assembled together by wax mold group welding process.
[0014] A pouring investment mold structure of a control valve body according to an embodiment of the present invention, the exhaust wax bars and the straight mold head wax mold, and the horizontal mold head wax molds are respectively assembled together by wax mold group welding process.
[0015] Compared with the prior art, the beneficial effects of the present invention are:
[0016] In the present invention, the pouring mold head wax mold not only includes a straight mold head wax mold connected to the middle part of the valve pipe of the control valve body wax mold, but also includes a horizontal mold head wax mold connected to the two end flanges of the control valve body wax mold, and a front mold head wax mold connected to the top of the threaded seat of the control valve body wax mold. After wax mold tree building and shell making, the middle part, both ends and front end of the control valve body wax mold have structural supports, forming a stable wax mold and shell mold structure. During pouring, molten steel enters the control valve body shell mold through the straight mold head and the middle gate, enters the control valve body shell mold through a pair of horizontal mold heads and two internal gates, and enters the control valve body shell mold through the front mold head and the internal gate, ensuring the uniformity of molten steel pouring. The subsidy wax mold is arranged with the horizontal mold head close to the internal gate to strengthen the feeding capacity of the pouring mold head, which can effectively prevent shrinkage porosity defects caused by the riser being insufficient to supplement the volume shrinkage during the pouring process at the two end flanges and the threaded seat of the control valve body, greatly improving the yield rate and ensuring the casting quality of the control valve body.
Description of the Drawings
[0017] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:
[0018] Figure 1 is a structural schematic diagram of an embodiment of the present invention Figure 1 ;
[0019] Figure 2 Structural schematic of an embodiment of the present utility model Figure 2 ;
[0020] Figure 3 Structural schematic of an embodiment of the present utility model Figure 3 ;
[0021] Figure 4 Exploded schematic of an embodiment of the present utility model Figure 1 ;
[0022] Figure 5 Exploded schematic of an embodiment of the present utility model Figure 2 ;
[0023] Figure 6 Exploded schematic of an embodiment of the present utility model Figure 3 .
[0024] Description of main component symbols:
[0025] 10. Wax mold of control valve body; 11. Valve pipe; 12. Threaded seat; 13. Independent hot spot part; 20. Straight mold head wax mold; 30. Horizontal mold head wax mold; 40. Front mold head wax mold; 50. Middle gate mold head; 60. Inner gate mold head; 70. Sprue cup wax mold; 80. Cotton padding; 90. Wax draining strip; 100. Subsidary wax mold.
Detailed implementation manners
[0026] The following details the embodiments of the present utility model. The illustrated embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout.
[0027] The orientation shown in the drawings should not be construed as limiting the specific protection scope of the present utility model. It is only for reference and understanding of the preferred embodiments, and the positions of the product components shown in the drawings can be changed, the quantity increased, or the structure simplified.
[0028] The "connection" described in the specification and the "connection" relationship between the components shown in the drawings can be understood as fixedly connected, detachably connected, or integrally formed connections; it can be directly connected or connected through an intermediate medium. Those of ordinary skill in the art can understand the connection relationship according to the specific situation and can obtain different implementation manners by means such as screwing, riveting, welding, clamping, or embedding for substitution in a suitable manner.
[0029] The orientation words such as upper, lower, left, right, top, bottom, etc. described in the specification and the orientation shown in the drawings mean that the components can be in direct contact or in contact through other features between them; for example, being above can mean directly above or obliquely above, or it only means being higher than other objects; other orientations can be analogously understood.
[0030] The manufacturing materials of the components with solid shapes shown in the specification and drawings can be metallic materials, non-metallic materials or other synthetic materials; the machining processes applicable to the components with solid shapes can be stamping, forging, wire cutting, laser cutting, casting, injection molding, numerical milling, 3D printing, machining, etc.; those of ordinary skill in the art can adaptively select or select in combination according to different processing conditions, costs and precisions, but are not limited to the above materials and manufacturing processes.
[0031] The present utility model provides a casting investment structure for a control valve body, as Figures 1 to 6 shown, which includes a control valve body wax pattern 10 and a casting head wax pattern. The casting head wax pattern includes a straight head wax pattern 20, a pair of transverse head wax patterns 30 respectively extending laterally from both sides of the straight head wax pattern 20, and a front head wax pattern 40 extending from the front end of the straight head wax pattern 20. A middle runner head 50 is assembled and connected between the bottom of the straight head wax pattern 20 and the middle part of the valve tube 11 of the control valve body wax pattern 10 through a wax pattern assembly welding process. The pair of transverse head wax patterns 30 are respectively assembled and connected with the flanges at both ends of the valve tube 11 of the control valve body wax pattern 10 through a wax pattern assembly welding process to an inner runner head 60. The front head wax pattern 40 is assembled and connected with the top of the threaded seat 12 of the control valve body wax pattern 10 through a wax pattern assembly welding process to an inner runner head 60.
[0032] In the present utility model, the casting head wax pattern not only includes the straight head wax pattern 20 connected to the middle part of the valve tube 11 of the control valve body wax pattern 10, but also includes the transverse head wax patterns 30 connected to the flanges at both ends of the valve tube 11 of the control valve body wax pattern 10, and the front head wax pattern 40 connected to the top of the threaded seat 12 of the control valve body wax pattern 10. After wax pattern tree building and shell making, the middle part, both ends and front end of the control valve body wax pattern 10 have structural supports, forming a stable wax pattern and shell mold structure. During casting, molten steel enters the control valve body shell mold through the straight head and the middle runner, enters the control valve body shell mold through a pair of transverse heads and two inner runners, and enters the control valve body shell mold through the front head and the inner runner, ensuring the uniformity of molten steel casting. The settings of the transverse head wax patterns 30 and the feeder 100, and the front head wax pattern 40 enhance the feeding capacity of the casting head, and can effectively prevent shrinkage porosity defects in the flanges at both ends of the valve tube 11 and the threaded seat 12 of the control valve body due to insufficient risers to supplement the volume shrinkage during the casting process, greatly improving the casting quality of the control valve body. The yield rate is as high as 47.8%, and the castings are defect-free in RT and PT inspections. The string weight is reduced to 36 Kg, greatly reducing the labor intensity of workers.
[0033] Further, in some embodiments of the present utility model application, as Figures 1 to 5As shown, the pouring die head wax pattern further includes a sprue cup wax pattern 70 integrally formed with the straight die head wax pattern 20 at the top end of the straight die head wax pattern 20.
[0034] Further, in some embodiments of the present utility model application, such as Figures 3 to 5 As shown, the control valve body wax pattern 10 has a boss structure 13. After the control valve body wax pattern 10 between the middle gate die head 50 and the boss structure 13 is made into a shell mold, a cotton patch 80 is provided on the outer wall of the shell mold. In the present utility model, the die head of the boss structure 13 is cancelled, and instead, the cotton patch 80 is provided between the middle gate die head 50 and the boss structure 13. The cotton patch is made of aluminosilicate fiber, mainly to slow down the cooling rate and ensure the smoothness of the feeding channel.
[0035] Further, in some embodiments of the present utility model application, after the shell mold of the transverse die head wax pattern 30 is made at the end away from the straight die head wax pattern 20, an aluminosilicate fiber blanket is pasted on the outer wall of the shell mold of the subsidy wax pattern 100, which plays a role in strengthening the feeding amount and enhancing the feeding capacity of the transverse die head.
[0036] Further, in some embodiments of the present utility model application, such as Figures 1 to 6 As shown, wax draining bars 90 are respectively assembled between the upper end of the straight die head wax pattern 20 and the transverse die head wax patterns 30 on both sides thereof by means of wax pattern group welding process. The setting of the wax draining bars 90 strengthens the dewaxing and wax draining ability of the casting shell mold, prevents the shell mold from cracking due to untimely wax draining, and can discharge the air in the cavity during the pouring process, strengthens the air exhausting ability during pouring, improves the filling speed during pouring, and further improves the casting quality of the control valve body.
[0037] Although the present utility model has been described in detail with reference to the above embodiments, it is obvious to those skilled in the art through the present disclosure that various changes or modifications can be made to the present utility model without departing from the principle and spirit scope of the present utility model defined by the claims. Therefore, the detailed description of the embodiments of the present disclosure is only used for explanation, rather than for limiting the present utility model, and the protection scope is defined by the content of the claims.
Claims
1. A control valve body casting investment mold structure, characterized in that: The invention comprises a control valve body wax mold (10) and a die head wax mold, wherein the die head wax mold comprises a straight die head wax mold (20), a pair of transverse die head wax molds (30) extending laterally from both sides of the straight die head wax mold (20), and a front die head wax mold (40) extending from the front end of the straight die head wax mold (20), the bottom of the straight die head wax mold (20) is connected to the middle of the valve tube (11) of the control valve body wax mold (10), the pair of transverse die head wax molds (30) are respectively connected to the flanges at both ends of the valve tube (11) of the control valve body wax mold (10), and the front die head wax mold (40) is connected to the top of the threaded seat (12) of the control valve body wax mold (10).
2. A control valve body casting investment mold structure according to claim 1, characterized in that: The die head wax mold also includes a pouring cup wax mold (70) which is arranged at the top of the straight die head wax mold (20) and is integrally formed with the straight die head wax mold (20).
3. A control valve body casting investment mold structure according to claim 1, characterized in that: A center gate die head (50) is connected between the bottom of the straight die head wax mold (20) and the middle of the valve tube (11) of the control valve body wax mold (10).
4. A control valve body casting investment mold structure according to claim 1, characterized in that: An inner gate die head (60) is connected between the horizontal die head wax mold (30) and the flanges at both ends of the valve tube (11) of the control valve body wax mold (10), and an inner gate die head (60) is connected between the front die head wax mold (40) and the top of the threaded seat (12) of the control valve body wax mold (10).
5. A control valve body casting investment mold structure according to claim 1, characterized in that: Wax strips (90) are respectively connected between the upper end of the straight die head wax mold (20) and the horizontal die head wax molds (30) on both sides thereof.
6. A control valve body casting investment mold structure according to claim 3, characterized in that: The middle gate die head (50) is assembled together with the bottom of the straight die head wax mold (20) and the middle of the valve tube (11) of the control valve body wax mold (10) through a wax mold welding process.
7. A control valve body casting investment mold structure according to claim 4, characterized in that: The inner gate die head (60), the transverse die head wax mold (30), and the end of the valve tube (11) of the control valve body wax mold (10) are assembled together through a wax mold assembly welding process.
8. A control valve body casting investment mold structure according to claim 5, characterized in that: The wax strip (90) is assembled with the straight die head wax mold (20) and the horizontal die head wax mold (30) respectively through a wax mold assembly welding process.