Low-damping type matrix overflow discharging vacuum gypsum mold forming mold
By setting an overflow capillary tube in the plaster mold and combining it with the plaster mold, the problem of demolding difficulty and blockage at the heat dissipation pin is solved, and high-quality casting products are achieved. In particular, the qualification rate of castings with small heat dissipation pin structures is significantly improved.
Patent Information
- Application Number
- CN202422794044.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2034-11-15
AI Technical Summary
In the existing technology, thin-walled precision castings with densely packed small-diameter heat dissipation pins have problems such as blockage of the overflow holes at the heat dissipation pins, cracks, and difficulty in demolding during the casting process, resulting in poor product quality and low pass rate.
A low-damping matrix overflow vacuum gypsum mold is adopted. By setting an overflow capillary tube and combining it with the gypsum mold to form an integral whole, the demolding resistance is reduced. During the grouting process of the gypsum mold, a matrix overflow capillary tube with a smooth inner wall is embedded to improve the efficiency of air venting and slag removal, and ensure the integrity of the gypsum mold.
It improves the integrity of the plaster mold, avoids damage and blockage during demolding, and enhances the quality of finished products. In particular, the pass rate of castings with fine heat dissipation pin structures reaches over 95%.
Smart Images
Figure CN223775987U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to special casting technical field relates to a low damping formula matrix exhausts and pours vacuum gypsum type forming mould. BACKGROUND
[0002] For thin-walled precision casting with densely arranged small-diameter (small-diameter refers to diameter not greater than 2mm, height-diameter ratio greater than 20) heat dissipation needle structure, generally adopt aluminum mold (or wax mold) to fill in gypsum type and carry out vacuum casting after baking and baking, make small exhaust hole sample on aluminum mold (or wax mold) at heat dissipation needle, form exhaust and deslagging passage after taking out with mold, to solve the problem of difficult forming of heat dissipation needle.
[0003] But small exhaust hole sample mould has large adhesion and is difficult to take out when demoulding, in the process of gypsum type dewaxing and baking, not only the exhaust hole is easy to block, but also small cracks and micro-bubbles appear in the hole, which leads to rough hole wall and greatly increases the exhaust and deslagging resistance, even if vacuum pouring is used, the heat dissipation needle with very small diameter still has pouring defect, and the qualified rate is less than 50%.
[0004] To solve the above problems, a gypsum type forming mould and a casting method are needed to avoid the problem that the cavity of the heat dissipation needle part is incomplete after the gypsum type is demoulded, thereby affecting the quality of the final product. UTILITY MODEL CONTENTS
[0005] Therefore, the utility model provides a low damping formula matrix exhausts and pours vacuum gypsum type forming mould, through setting up exhaust capillary tube, makes the exhaust capillary tube and the gypsum type combine to form a whole in the process of forming of the gypsum type, reduces the demoulding resistance of the gypsum type, the gypsum type is complete and not easy to be damaged, no exhaust hole blockage and crack phenomenon appears in the process of gypsum type dewaxing and baking, thereby improving the quality of the final product.
[0006] The utility model discloses a low damping formula matrix exhausts and pours vacuum gypsum type forming mould, including type mould body and exhaust capillary tube, the exhaust capillary tube slides and inserts in type mould body, exhaust capillary tube is provided with multiple, and multiple exhaust capillary tube array setting.
[0007] Further, the type mould body includes a type mould base plate and a type mould frame, the type mould frame is arranged on the top surface of the type mould base plate to form a type cavity that is open at the top and closed at the bottom and around, and the array of exhaust capillary tubes is arranged in the type cavity.
[0008] Further, it further includes a positioning top plate, the positioning top plate is detachably installed on the top surface of the type mould frame to close the type cavity, the positioning top plate is provided with positioning holes for positioning and limiting the exhaust capillary tubes, and the number of the positioning holes is the same as that of the exhaust capillary tubes.
[0009] Further, the mold body is provided with a workpiece mold, the workpiece mold has a plurality of vertically arranged heat dissipation needle molds, the number of the overflow capillary tubes is equal to that of the heat dissipation needle molds, and the plurality of overflow capillary tubes are arranged one by one on the top surface of the heat dissipation needle molds.
[0010] Further, the positioning holes are arranged one by one corresponding to the heat dissipation needle molds, and the bottom surface of the overflow capillary tube is lapped on the top surface of the heat dissipation needle mold after passing through the positioning hole.
[0011] Further, the overflow capillary tube has an overflow channel penetrating in the axial direction, the diameter of the overflow channel is smaller than that of the heat dissipation needle mold, and the difference between the diameter of the overflow channel and that of the heat dissipation needle mold is 0.3-0.6 mm.
[0012] Further, the top surface of the mold frame extends upward in the vertical direction to form a limiting boss, the limiting boss is provided with a positioning opening, the positioning top plate is provided with a positioning strip at a position corresponding to the positioning opening, and the positioning strip of the positioning top plate is clamped in the positioning opening.
[0013] Further, the positioning top plate is further provided with a pouring opening, and the pouring opening is arranged away from the positioning hole.
[0014] The utility model discloses beneficial effects:
[0015] The utility model provides a low damping formula matrix overflow vacuum gypsum mold forming mould, through setting up overflow capillary tube, make the gypsum mould in the process of forming overflow capillary tube and gypsum mould combination form a whole, reduced the demoulding resistance of gypsum mould, and the gypsum mould is complete and not easy to break, and there is no overflow hole blockage, crack phenomenon in the process of gypsum mould dewaxing and baking, and then the final product quality is improved. Meanwhile, through embedding the matrix type overflow capillary tube with smooth inner wall in the process of gypsum mould grouting, the exhaust and deslagging efficiency of fine needle structure is greatly improved, the vacuum suction effect is enlarged, the gas and dross in the front end of liquid flow are fully discharged, the process of filling metal liquid in the front end of needle body is extended, and the complete filling of needle body is realized. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is the explosion isometric side view of the utility model;
[0017] Figure 2 It is the assembly structure isometric side view of the utility model;
[0018] Figure 3 It is the local enlarged view of the corresponding arrangement of the overflow capillary tube and the heat dissipation needle mold;
[0019] Figure 4 It is the structure schematic view of the gypsum mould of the embodiment of the utility model;
[0020] Figure 5 A front view of a gypsum pattern according to an embodiment of the present application;
[0021] Figure 6 To Figure 5 An enlarged view of a portion of B. DETAILED DESCRIPTION
[0022] It should be noted that in the description of the present application, the terms "upper", "lower", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The beginning and end of the present embodiment, as well as the front and back, are based on the order of the flow of the medium, i.e. the front is the first to flow through, and the beginning is the first to flow through, which is understood by those skilled in the art, and will not be described here.
[0023] As shown in the figure, the embodiment of the present application discloses a low-damping matrix array overflow vacuum gypsum pattern forming mold, which comprises a mold body and an overflow capillary tube 2, the overflow capillary tube 2 is slidingly inserted into the mold body; the overflow capillary tube 2 is provided with a plurality of overflow capillary tubes 2, and the plurality of overflow capillary tubes 2 are arrayed. The overflow capillary tube 2 in the present embodiment is a metal tube, and the overflow capillary tube 2 is provided, so that the overflow capillary tube 2 and the gypsum pattern 12 form a whole during the forming process of the gypsum pattern 12, the demolding resistance of the gypsum pattern 12 is reduced, the gypsum pattern 12 is complete and not easy to break, and there is no overflow hole blockage and crack phenomenon during the dewaxing and baking process of the gypsum pattern 12, thereby improving the quality of the final product. In the present embodiment, the mold body comprises a mold bottom plate 1 and a mold frame 4, the mold frame 4 is arranged on the top surface of the mold bottom plate 1 to form a mold cavity which is open at the top and closed at the bottom and around, and the overflow capillary tube 2 is arrayed in the mold cavity. The sliding insertion of the overflow capillary tube 2 in the present embodiment means that its installation mode is such a sliding insertion, which is movably arranged in the mold cavity, rather than being fixed in the mold body through other structures, and such arrangement ensures that the overflow capillary tube 2 can be easily removed together with the gypsum pattern 12 after the gypsum pattern 12 is formed, and the demolding is more easy.
[0024] In the embodiment, a positioning top plate 3 is detachably mounted on the top surface of the mold frame 4 to close the mold cavity, and the positioning top plate 3 is provided with positioning holes 7 for positioning and limiting the overflow capillary tubes 2, and the number of the positioning holes 7 is the same as that of the overflow capillary tubes 2. In the embodiment, the mold body is provided with a workpiece mold 5, and the workpiece mold 5 has a plurality of vertically arranged heat dissipation needle molds 6, and the number of the overflow capillary tubes 2 is equal to that of the heat dissipation needle molds 6, and the plurality of overflow capillary tubes 2 are correspondingly arranged on the top surface of the heat dissipation needle molds 6. In the embodiment, the positioning holes 7 are correspondingly arranged on the heat dissipation needle molds 6, and the bottom surface of the overflow capillary tube 2 is lapped on the top surface of the heat dissipation needle mold 6 after passing through the positioning hole 7. As shown in the figure, the number of the heat dissipation needle molds 6, the overflow capillary tubes 2 and the positioning holes 7 in the embodiment is the same, and the positions of the heat dissipation needle molds 6 and the positioning holes 7 correspond one by one, that is, a positioning hole 7 is arranged above each heat dissipation needle mold 6, so that the overflow capillary tube 2 is kept in a vertical state after being inserted into the mold cavity through the positioning hole 7 and falling on the top surface of the heat dissipation needle mold 6, and the overflow capillary tube 2 is kept vertical in the formed gypsum mold 12 when the gypsum liquid is poured to make the gypsum mold 12. The positioning hole 7 of the embodiment positions the overflow capillary tube 2 in the radial direction, and the bottom surface of the overflow capillary tube 2 is lapped on the top surface of the heat dissipation needle mold 6 after being inserted, and the top of the overflow capillary tube 2 is limited in the positioning hole 7, so that the overflow capillary tube 2 cannot shake in the radial direction. The workpiece mold 5 refers to a mold conforming to the workpiece to be poured, and the workpiece mold 5 is arranged so that the gypsum mold 12 has a cavity conforming to the workpiece after being formed to perform subsequent casting.
[0025] In the embodiment, the overflow capillary tube 2 has an overflow channel penetrating in the axial direction, that is, the overflow capillary tube 2 is a hollow tubular structure, and the hollow part is the overflow channel, the diameter of the overflow channel is smaller than the diameter of the heat dissipation needle mold 6, and the difference between the diameter of the overflow channel and the diameter of the heat dissipation needle mold 6 is 0.3-0.6 mm. Taking the heat dissipation needle mold 6 with a diameter of 2 mm as an example (that is, the diameter of the heat dissipation needle after forming is 2 mm), the diameter of the overflow channel is 1.4-1.7 mm, and preferably 1.55±0.05 mm. This design not only ensures the overflow effect, but also ensures that the quality of the heat dissipation needle of the final product meets the standard.
[0026] In the embodiment, the top surface of the mold frame 4 extends upward in the vertical direction to form a limiting boss 10, the limiting boss 10 is provided with a positioning opening 11, the positioning top plate 3 is provided with a positioning strip 9 corresponding to the position of the positioning opening 11, and the positioning strip 9 of the positioning top plate 3 is clamped in the positioning opening 11. As shown in the figure, the limiting boss 10 in the embodiment is symmetrically arranged in two parts. Only two symmetric parts are convenient for taking and installing the positioning top plate 3. The main positioning and limiting are achieved by clamping the positioning strip 9 into the positioning opening 11. The two positioning openings 11 in the embodiment are respectively located at the middle positions of the limiting boss 10.
[0027] In the embodiment, the positioning top plate 3 is also provided with a pouring opening 8, and the pouring opening 8 avoids the positioning hole 7. As shown in the figure, the positioning top plate 3 is rectangular, and the pouring opening 8 is arranged at a corner thereof.
[0028] In the embodiment, the method for vacuum gypsum type casting using the low-damping matrix overflow vacuum gypsum type forming mold described above specifically includes the following steps:
[0029] S1. Machining a positioning top plate 3; taking a piece of transparent organic glass with a thickness of 10-15 mm according to the size of the drawing, and numerically controlling the positioning hole 7.
[0030] S2. Installing the positioning top plate 3 to the mold body, and inserting a plurality of overflow capillary tubes one by one into the positioning holes 7, so that the bottom surface of the overflow capillary tube is overlapped to the top surface of the heat dissipation needle mold 6; the overflow capillary tube is sequentially and freely slid down along the positioning hole 7 on the positioning top plate 3 and falls into the top part of the corresponding heat dissipation needle aluminum mold.
[0031] S3. Modulating gypsum slurry, and injecting the modulated gypsum slurry into the cavity of the mold body through the pouring opening 8 of the positioning top plate 3 until the cavity of the mold body is filled with the modulated gypsum slurry; after the gypsum slurry is hardened, the gypsum type 12 integrally formed with the overflow capillary tube is taken out;
[0032] S4. The gypsum type 12 is put into the furnace for baking, and after being taken out of the furnace, the gypsum type 12 is blown clean with compressed air. The blowing clean of the gypsum type 12 is to blow away the floating dust in the cavity of the gypsum type 12 (including the workpiece cavity corresponding to the workpiece mold 5 and the heat dissipation needle cavity 13 corresponding to the heat dissipation needle mold) and the overflow channel of the overflow capillary tube with compressed air, so that the gypsum type 12 with a low-damping overflow system and a smooth pipe wall is obtained.
[0033] The cleaned gypsum mold is combined with other gypsum mold components as needed, and then enters the vacuum tank for pouring. The vacuum pouring is beneficial to the filling of metal liquid for thin-walled and micro-diameter long-flow needle-shaped structures. By embedding the matrix overflow capillary tube with smooth inner wall in the process of gypsum mold grouting, the exhaust and deslagging efficiency of the fine needle structure is greatly improved, the vacuum suction effect is enlarged, the gas and dross at the front end of the liquid flow are fully discharged, the flow process of the metal liquid filling the front end of the needle-shaped body is extended, and the complete filling of the needle-shaped body is realized. Compared with the prior art, the overflow capillary tube is separated from the gypsum mold after the gypsum mold grouting is hardened, the demolding resistance is reduced, the gypsum mold is complete and not easy to be damaged, and there is no overflow hole blockage and crack phenomenon in the process of gypsum mold dewaxing and roasting. The gypsum mold of the utility model can realize the precision casting of thin-walled castings with dense distribution of small heat dissipation needles (diameter of about 2mm, height-diameter ratio greater than 20), eliminate the pouring deficiency defect, obtain the castings with dense structure and clear outline at the front of the needle tip, and improve the product qualified rate to more than 95%.
[0034] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the utility model and not to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the purpose and scope of the utility model technical solutions, and all of them should be covered in the scope of the claims of the utility model.
Claims
1. A low-damping matrix overflow vacuum plaster mold, characterized in that: It includes a mold body and an overflow capillary, the overflow capillary being slidably inserted into the mold body; multiple overflow capillary tubes are provided, and the multiple overflow capillary tubes are arranged in an array.
2. The low-damping matrix overflow vacuum plaster mold according to claim 1, characterized in that: The mold body includes a mold base plate and a mold frame. The mold frame is disposed on the top surface of the mold base plate to form a cavity that is open at the top and closed at the bottom and around the sides. The overflow capillary array is disposed in the cavity.
3. The low-damping matrix overflow vacuum plaster mold according to claim 2, characterized in that: It also includes a positioning top plate, which is detachably installed on the top surface of the mold frame to close the cavity. The positioning top plate is provided with positioning holes for positioning and limiting the overflow capillary, and the number of positioning holes is the same as that of the overflow capillary.
4. The low-damping matrix overflow vacuum plaster mold according to claim 3, characterized in that: The mold body is provided with a workpiece mold, the workpiece mold has multiple vertically arranged heat dissipation pin molds, the number of overflow capillaries is equal to the number of heat dissipation pin molds, and the multiple overflow capillaries are arranged one-to-one on the top surface of the heat dissipation pin mold.
5. The low-damping matrix overflow vacuum plaster mold according to claim 4, characterized in that: The positioning holes are set one-to-one with the heat dissipation pin mold, and the bottom surface of the overflow capillary passes through the positioning holes and overlaps the top surface of the heat dissipation pin mold.
6. The low-damping matrix overflow vacuum plaster mold according to claim 5, characterized in that: The overflow capillary tube has an axially extending overflow channel, the diameter of which is smaller than the diameter of the heat dissipation pin mold, and the difference between the diameter of the overflow channel and the diameter of the heat dissipation pin mold is 0.3-0.6 mm.
7. The low-damping matrix overflow vacuum plaster mold according to claim 5, characterized in that: The top surface of the mold frame extends vertically upward to form a limiting boss. The limiting boss is provided with a positioning port. The positioning top plate is provided with a positioning strip corresponding to the position of the positioning port. The positioning strip of the positioning top plate is engaged with the positioning port.
8. The low-damping matrix overflow vacuum plaster mold according to claim 7, characterized in that: The positioning top plate is also provided with an injection port, which is positioned to avoid the positioning hole.