Casting system suitable for turning and milling combined machining center tool turret casting
By designing furan resin sand molds and central heating risers, combined with forming chills and bottom gating systems, balanced solidification of the turning and milling composite machining center turret castings was achieved, solving the hydraulic leakage problem caused by poor density and improving the casting quality.
Patent Information
- Application Number
- CN202422864927.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-11-22
AI Technical Summary
Existing technologies make it difficult to achieve uniform solidification of the turret castings in mill-turn machining centers, resulting in poor density and a tendency for hydraulic leakage.
Using furan resin sand molds with forming chills and central heating risers, combined with a bottom gating system, molten iron is introduced through ceramic bends to control the solidification and cooling temperature field of the casting, achieving reverse-sequential solidification from thick-walled edges to thin-walled centers.
It effectively solves the problem of casting density, avoids sulfur seepage defects, ensures casting quality, and prevents hydraulic leakage.
Smart Images
Figure CN223518612U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to foundry technology field especially suitable for turning and milling combined machining center cutter tower casting's casting system. BACKGROUND
[0002] The tool rest on the numerical control machine tool is the important part of placing the tool, and the material of the tool tower is usually QT450-10, typical thick-walled casting, the surface is all precision machined, and a large number of through or through deep holes are drilled in the inside as hydraulic and cooling channels. When manufacturing, it is required that there is no any defect inside and outside the casting, and the defect on the surface may affect the appearance and the function, and the internal defect has the risk of hydraulic leakage. The conventional edge riser plus chill process is generally used, but due to the paste-like solidification characteristics of the nodular cast iron, the riser is difficult to supplement the shrinkage of the core of the casting. Using the traditional process, the core of the casting is generally not dense, and leakage often occurs when the internal pressure leakage inspection of the casting is carried out, resulting in the casting being scrapped. According to the solidification analysis, it is shown that the traditional edge riser process is difficult to realize complete sequential solidification, the edge riser enters the molten iron from the thick wall, which to some extent causes the heat to be added to the key thick wall part of the casting, and the edge riser causes certain thermal interference to the solidification of the casting while supplementing the shrinkage, so that the density and quality of the casting are difficult to be stably ensured. SUMMARY
[0003] The utility model aims at realizing the balanced solidification from the casting to the riser, and solving the problem that the hydraulic leakage of the tool tower casting is caused by poor density.
[0004] To solve the above technical problems, one technical scheme of the utility model is as follows:
[0005] A casting system suitable for turning and milling combined machining center tool tower casting, comprising: furan resin sand mold, pouring system;
[0006] The bottom of the furan resin sand mold is provided with a shaped chill along the shape of the furan resin sand mold;
[0007] A center heating riser is arranged along the center of the furan resin sand mold;
[0008] The pouring system adopts bottom pouring.
[0009] Preferably, the pouring system comprises pouring pipeline, shunt, elbow pouring gate;
[0010] A shunt bin is arranged below the pouring pipeline, and the shunt bin is connected with the shunt;
[0011] The elbow pouring gate is located below the shunt, and the elbow pouring gate is introduced from the bottom of the center heating riser.
[0012] Preferably, the runner includes a left runner and a right runner, the elbow runner includes a left elbow runner and a right elbow runner, the left runner is communicated with the left elbow runner, and the right runner is communicated with the right elbow runner.
[0013] Preferably, the pouring channel is provided with a pouring gate.
[0014] Preferably, the elbow runner is a ceramic elbow runner.
[0015] Preferably, the furan resin sand mold has an outer wall thickness of 125 mm and a wall thickness of 45 mm near a center of the furan resin sand mold.
[0016] Preferably, the center heating riser has a diameter of 1.5 times a thickness of the adjacent furan resin sand mold.
[0017] The casting system of the present application has the following advantages:
[0018] (1) The casting system of the present application can control the solidification and cooling temperature field of the sand mold casting, realize the reverse sequential solidification of the casting from the edge thick wall to the center relative thin wall of the sand mold, and thus ensure the compactness of the thick wall part of the casting and the quality of the casting.
[0019] (2) The present application sets the forming cold iron at the bottom of the furan resin sand mold, effectively isolates the contact between the local molten iron and the surface layer resin sand, and fundamentally solves the defect that the sulfur in the furan resin sand penetrates into the casting to cause the casting to be scrapped. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 Fig. 1 is a structural schematic view of the casting system of the present application;
[0021] Figure 2 Fig. 2 is a structural schematic view of the forming cold iron shown in the embodiment;
[0022] Figure 3 Fig. 3 is another angle structural schematic view of the pouring system shown in the embodiment;
[0023] Figure 4 Fig. 4 is a structural schematic view of the center heating riser shown in the embodiment;
[0024] The marks of the components in the drawings are as follows:
[0025] 1, furan resin sand mold; 2, forming chill; 3, center heating riser; 4, pouring pipe; 5, pouring gate; 6, shunt bin; 7, left shunt; 8, right shunt; 9, left elbow pouring gate; 10, right elbow pouring gate. DETAILED DESCRIPTION
[0026] The preferred embodiments of the utility model are described in detail below with reference to the drawings, so that the advantages and features of the utility model can be more easily understood by those skilled in the art, and the protection scope of the utility model can be more clearly and explicitly defined.
[0027] Embodiment:
[0028] This embodiment introduces a casting system suitable for turning and milling combined machining center tool tower castings.
[0029] As shown in Figure 1 , 2 , Figure 1 , the structure diagram of the pouring system suitable for the turning and milling combined machining center tool tower casting of the utility model, Figure 2 , the structure diagram of the forming chill shown in the embodiment. A pouring system suitable for a turning and milling combined machining center tool tower casting, comprising: a furan resin sand mold 1, a pouring system; The bottom of the furan resin sand mold 1 is provided with a forming chill 2 along the shape of the furan resin sand mold; A center heating riser 3 is arranged along the center of the furan resin sand mold 1; The pouring system adopts bottom pouring.
[0030] Further, as shown in Figure 3 , Figure 3 , another angle structure diagram of the pouring system shown in the embodiment. The pouring system comprises a pouring pipe 4, a shunt, and an elbow pouring gate;
[0031] The shunt bin 6 is arranged below the pouring pipe 4, and the shunt bin 6 is connected with the shunt;
[0032] The elbow pouring gate is located below the shunt, and the elbow pouring gate is introduced from the bottom of the center heating riser 3.
[0033] Further, the shunt comprises a left shunt 7 and a right shunt 8, and the elbow pouring gate comprises a left elbow pouring gate 9 and a right elbow pouring gate 10, the left shunt 7 is connected with the left elbow pouring gate 9, and the right shunt 8 is connected with the right elbow pouring gate 10.
[0034] In this embodiment, the elbow pouring gate adopts a ceramic elbow. By adopting the ceramic elbow to introduce molten iron, the molten iron enters the cavity from the center heating riser, which strengthens the temperature gradient and is beneficial to realize sequential solidification from the casting to the riser.
[0035] Further, the pouring channel 4 is provided with a pouring gate 5.
[0036] In the embodiment, the thickness of the outer wall of the furan resin sand mold is 125 mm, and the thickness of the wall near the center of the furan resin sand mold is 45 mm, according to the requirements of the pouring cutter tower casting. Since the thickness of the outer wall of the furan resin sand mold is relatively thick, the cooling and solidification time is relatively long under the same conditions. In view of this, the molten iron is introduced from the relatively thin wall near the center of the sand mold, and the temperature of the molten iron in the sand mold cavity is higher than that of the thick wall of the outer wall of the sand mold. The solidification and cooling time is also prolonged, which balances the temperature field of the center of the pouring casting and the thick wall of the outer edge to a certain extent, and is beneficial to the balanced solidification of the casting.
[0037] In the embodiment, the center heating riser uses a conventional heating riser, but the diameter of the center heating riser is 1.5 times the thickness of the adjacent furan resin sand mold, which is beneficial to the sequential solidification of the casting and makes the last solidification part of the casting be the riser, thereby realizing effective transfer of the shrinkage zone of the casting.
[0038] In the scheme, the sulfur penetration defect of the resin sand casting is also solved. Due to the characteristics of the furan resin sand, the sulfur in the resin sand is easy to penetrate into the casting, resulting in poor nodularity of the surface layer of the thick-walled ductile iron casting and causing the sulfur penetration layer defect. The sulfur penetration defect generally occurs at the bottom of the casting. Therefore, in the scheme, the shaped chill is arranged at the bottom of the sand mold, which effectively isolates the contact between the local molten iron and the surface layer of the resin sand, thereby fundamentally solving the sulfur penetration defect.
[0039] For the casting system, the inventor also conducts a solidification mold flow analysis, and the analysis shows that the special designed furan resin sand mold cooperates with the special shaped chill and the center heating riser to control the solidification and cooling temperature field of the sand mold casting, realizes the reverse sequential solidification of the casting from the thick wall of the edge to the relatively thin wall of the center of the sand mold, thereby ensuring the compactness of the thick wall of the edge of the casting, ensuring the quality of the casting, and solving the problem of hydraulic leakage of the cutter tower caused by the compactness.
[0040] The above only describes the embodiments of the present application, and does not limit the patent range of the present application. Any equivalent structure or equivalent process conversion, or direct or indirect application in other related technical fields, which is based on the content of the present application and the drawings, is also included in the patent protection range of the present application.
Claims
1. A casting system suitable for a turning-milling hybrid machining center tool turret casting, characterized in that, Include: Furan resin sand mold (1), pouring system; The bottom of the furan resin sand mold (1) is provided with a shaped chill (2) along the shape of the furan resin sand mold; A center heating riser (3) is arranged along the center of the furan resin sand mold (1); The pouring system adopts bottom pouring.
2. The casting system suitable for the cutter tower casting of the hybrid machining center according to claim 1, characterized in that: The pouring system includes pouring pipe (4), shunt, elbow sprue; The shunt bin (6) is arranged below the pouring pipe (4), and the shunt bin (6) is connected with the shunt; The elbow sprue is located below the shunt, and the elbow sprue is introduced from the bottom of the center heating riser (3).
3. The casting system suitable for the cutter tower casting of the hybrid machining center as claimed in claim 2, wherein: The shunt includes left shunt (7) and right shunt (8), and the elbow sprue includes left elbow sprue (9) and right elbow sprue (10), the left shunt (7) is connected with the left elbow sprue (9), and the right shunt (8) is connected with the right elbow sprue (10).
4. The casting system suitable for the cutter tower casting of the hybrid machining center according to claim 2, characterized in that: The pouring pipe (4) is provided with a pouring gate (5).
5. The casting system suitable for the cutter tower casting of the hybrid machining center as claimed in claim 3, wherein: The elbow sprue adopts ceramic elbow.
6. The casting system suitable for a cutter tower casting of a turn-milling machining center according to claim 1, characterized in that: The outer wall thickness of the furan resin sand mold (1) is 125mm, and the wall thickness near the center part of the furan resin sand mold (1) is 45mm.
7. The casting system suitable for a cutter turret casting of a turn-milling center machining center according to claim 1, characterized in that: The diameter of the center heating riser (3) is 1.5 times the thickness of the adjacent furan resin sand mold (1).