Quenching core bar for hole type sand core
By setting a hollow thick-wall structure, exhaust groove and exhaust rope on the core bone body of the casting formwork casting to form an exhaust passage, the sand removal and pore problems in the casting hole forming process is solved, and the dense and coherent dense effects of the casting holes are achieved.
Patent Information
- Application Number
- CN202422058297.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-08-23
AI Technical Summary
The existing core bone structure is prone to defects such as sand removal, pores and cracks during the hole forming process of casting templates, which is difficult to meet production and quality requirements.
The core bone body with a hollow thick wall structure is adopted, and an exhaust groove is set on its outer surface to fill the exhaust rope, and combustion and carbonize at high temperature to form an exhaust passage. Combined with multiple circumferential exhaust grooves and exhaust holes, the cooling effect is achieved, the expansion gas is discharged, and the density of the surface of the hole is improved.
It effectively improves the molding quality of the casting holes, improves the density and consistency of the surface of the holes, solves defects such as sand removal and pores, and improves the overall molding quality of the casting.
Smart Images
Figure CN223185501U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of casting, in particular to a chilled core bone for a hole-type sand core. Background Art
[0002] The casting process can produce a wide variety of products, from small parts to large structural parts, with high manufacturing flexibility and efficiency. Different casting methods include die casting, sand casting, lost wax casting, etc. Each method is suitable for different types of products and material requirements and is applicable to the field of mechanical manufacturing.
[0003] The template casting is a key mechanical component of injection molding and die-casting machines, accounting for approximately 70% of the weight of the entire injection molding and die-casting machine. The template assembly is also the primary component that ensures the mold is securely closed and enables mold opening and closing. The template casting typically has corresponding hole features, and a core bone is typically used during molding of this area. Conventional core bones are mesh or string-like structures that serve only as support and hoisting. A layer of resin sand is placed on the core bone surface to create a sand core, which is then placed at a predetermined location. During the casting process, the core blocks the molten metal flow to create the hole features in the casting.
[0004] However, template castings have the characteristics of complex structure, thick wall, large heat node in the casting hole, and numerous sand cores required for casting holes. The current mainstream core bone structure has the problem of difficulty in sand falling during use, resulting in defects such as sand falling, air holes and cracks on the hole wall surface of the casting, which is difficult to meet production and quality requirements. Therefore, it is necessary to improve the existing technology. Utility Model Content
[0005] The utility model provides a chilled core bone for a hole-type sand core, which is used to solve the problem of molding quality that is easy to occur during the hole-position molding process of castings.
[0006] To achieve the above objectives, the present invention provides the following technical solutions:
[0007] A quenched core bone for a porous sand core comprises a core bone body, the interior of the core bone body being hollow and having a thick-walled structure; an exhaust groove is provided on the outer surface of the core bone body, the exhaust groove is filled with an exhaust rope, the exhaust rope is burned and carbonized under the high temperature of pouring, and an exhaust channel communicating with the outside is formed in the exhaust groove.
[0008] Preferably, the exhaust groove extends along the length direction of the core bar body and opens at the end faces of both ends of the core bar body respectively.
[0009] Preferably, there are multiple exhaust grooves, and the multiple exhaust grooves are arranged at intervals along the circumferential direction of the core body.
[0010] Preferably, a plurality of exhaust holes are provided through the core bar body, and two ends of the exhaust holes are respectively communicated with the interior of the core bar body and the bottom of the exhaust groove.
[0011] Preferably, the diameter of the exhaust hole is ≥15 mm.
[0012] Preferably, the wall thickness of the core bone body is ≥50 mm.
[0013] Preferably, the cross section of the exhaust groove is a semicircular profile, and the cross section radius of the exhaust groove is greater than or equal to 10 mm.
[0014] Preferably, the exhaust rope is a nylon rope, which is wound along the exhaust groove and gathered into the hollow interior of the cylinder.
[0015] Preferably, a hoisting portion is provided at the top end of the core bone body for hoisting the core bone body.
[0016] Preferably, the core body is made of gray cast iron.
[0017] Compared with the prior art, the present invention has at least one of the following beneficial effects:
[0018] 1. The core body is configured as a hollow, thick-walled cylindrical structure, which makes sand easier to fall out than conventional core bodies. Furthermore, exhaust grooves and pre-buried exhaust ropes are provided on the outer surface of the core body. During casting, the resin sand is heated and transferred to the core body. At this time, the exhaust ropes burn and carbonize, forming exhaust channels at the exhaust grooves. This achieves an exhaust quenching effect, forms a dense structure on the hole surface of the casting, and improves the hole molding quality of the casting.
[0019] 2. The exhaust hole allows the expanded gas in the exhaust groove to enter the hollow interior of the core bone and be further discharged, which significantly improves the refrigeration effect;
[0020] 3. Multiple sets of exhaust grooves can achieve a chilling effect around the holes of the casting, which can further improve the overall density and continuous density of the hole surface. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0022] Figure 1 This is a schematic structural diagram of a chilled core bone of a porous sand core provided in Example 1 of the present utility model;
[0023] Figure 2 This is a structural schematic diagram of the chilled core bone of the porous sand core provided by the first embodiment of the present invention from another perspective;
[0024] Figure 3 yes Figure 2 Cross-sectional view along the AA axis;
[0025] Figure 4 This is a structural schematic diagram of the chilled core bone of the porous sand core provided by the first embodiment of the present invention from another perspective;
[0026] Figure 5 yes Figure 2 Cross-sectional view along the BB direction;
[0027] Figure 6 This is a schematic structural diagram of a chilled core bone for a porous sand core provided in Example 2 of the present utility model;
[0028] Figure 7 This is a schematic structural diagram of a chilled core bone for a porous sand core provided in Example 2 of the present utility model;
[0029] Figure 8 This is a schematic structural diagram of the chilled core bone of a porous sand core provided in Example 3 of the present invention.
[0030] Reference numerals:
[0031] 1. Core body; 11. Exhaust groove; 12. Exhaust hole; 2. Exhaust rope; 3. Lifting part; 31. Lifting hole; 32. Lifting rod; 33. Lifting ring. DETAILED DESCRIPTION
[0032] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0033] In the description of the present invention, it should be understood that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally located component. When a component is considered to be "disposed on" another component, it may be directly disposed on the other component or there may be a centrally located component.
[0034] The following is combined with Figure 1-8The technical solution of the utility model is further explained through specific implementation methods.
[0035] Example 1:
[0036] Please refer to Figure 1 and Figure 2 , an embodiment of the utility model provides a porous sand core chilled core bone, which mainly includes a core bone body 1. Among them, in this embodiment, the overall shape of the core bone body 1 is a cylindrical structure. In actual use, it is usually necessary to use the core bone body 1 as the main support member, and attach a layer of resin sand to its surface through a wooden mold core box. The thickness of the resin sand is preferably less than 30 mm. Within this thickness range, the sand core can be relatively stably attached to the core bone body 1 to form a sand core with a stable structure; then the sand core is placed in the mold of the casting to shape the hole position features of the casting. Based on this, in order to solve the current problem of insufficient molding quality of thick-walled hole position features, this solution first sets an exhaust groove 11 from the outside to the inside on the surface of the core bone body 1. On the one hand, the exhaust groove 11 can increase the surface friction to facilitate the attachment of the resin sand to the core bone body 1. On the other hand, the exhaust groove 11 can exhaust the air that expands due to heat to achieve a chilled molding effect.
[0037] Specifically, when setting the exhaust groove 11, in order to achieve a good chilling effect, the exhaust groove 11 is first extended along the length direction of the core body 1; further, combined with Figure 3 The core body 1 is cut vertically along its length to form a cross section. Simultaneously, the cross section of the vent groove 11 is formed simultaneously. Preferably, the cross section of the vent groove 11 has a semicircular profile, which facilitates demolding of the core body 1 during molding. The cross-sectional radius of the vent groove 11 is preferably greater than or equal to 10 mm. In this embodiment, 10 mm is selected as an example. This arrangement provides ample space for gas to escape, and the specific size of the vent groove 11 is not limited herein.
[0038] At the same time, the exhaust groove 11 is a straight groove structure, and the exhaust groove 11 is opened at the end faces of both ends of the core body 1. Based on this setting, it is beneficial for the gas expanded by heat to be discharged to the outside from the end faces of both ends, realizing chilling forming, and then forming a dense layer structure on the surface of the casting hole.
[0039] Furthermore, the number of exhaust grooves 11 can be set to multiple, such as two, three, four, six, etc. The multiple exhaust grooves 11 are arranged at intervals along the circumferential direction of the core bone body 1, which provides a chilling effect on the surrounding areas of the casting hole features, so that the surface of the hole forms a coherent dense structure in the circumferential direction, and the overall molding effect of the hole is better.
[0040] It should be noted that, in this embodiment, the number of exhaust grooves 11 is set to four, and they are distributed around the core body 1. The four exhaust grooves 11 can quench the area around the hole position, which can meet the better molding effect. There is no restriction on the specific number of exhaust grooves 11, and any arrangement method that can achieve the quenching effect can be tried.
[0041] Reference Figure 4 In order to prevent the resin sand from clogging the exhaust channel during the process of adhering to the core bone body 1, the core bone structure also includes an exhaust rope 2 filled in the exhaust groove 11, which can prevent the resin sand from entering the exhaust groove 11. At the same time, it can be subjected to the high pouring temperature during metal pouring and then burn and carbonize, and form an exhaust channel connected to the outside world in the exhaust groove 11 to achieve a good quenching effect.
[0042] Specifically, in this embodiment, the exhaust rope 2 is a nylon rope. At the same time, in order to facilitate the stable installation of the exhaust rope 2 on the core bone body 1, the interior of the core bone body 1 is set as a hollow structure, and openings connected to the interior are set at both ends of the core bone body 1. The size of the nylon rope should be adapted to the air groove when it is set. For example, a rope body structure with a diameter of 20 mm is used. It is inserted into the exhaust groove 11, and the nylon rope is wrapped along the exhaust groove 11 and gathered into the hollow interior of the cylinder. At this time, the nylon rope is fixedly installed on the core bone body 1, and the exhaust groove 11 is blocked in all directions, which can effectively prevent resin sand from entering the exhaust groove 11.
[0043] Of course, in other embodiments, other structures can be used to replace the nylon rope. For example, paper ropes, hemp ropes, and even foam materials can be tried. Relevant structures that can achieve combustion carbonization and block resin sand from entering the exhaust groove 11 can be tried. No matter what filling material is used, it should be regarded as the same implementation method.
[0044] Reference Figure 5 To further optimize the cooling effect of the core bar body 1, multiple vent holes 12 are provided throughout the core bar body 1. For example, one vent groove 11 is connected at both ends to the interior of the core bar body 1 and the bottom of the groove 11. Furthermore, the multiple vent holes 12 are spaced apart along the length of the core bar body 1. This arrangement allows the expanding gas to escape not only from the groove 11 to the exterior of the structure, but also through the vent holes 12 into the hollow area of the core bar body 1 and escape through the openings at both ends. This increases the escape velocity of the expanding gas and further optimizes the cooling effect.
[0045] In addition, the diameter of the exhaust hole 12 is preferably ≥ 15 mm. In this embodiment, 15 mm is used as an example. If the diameter of the exhaust hole 12 is less than 15 mm, the gas flow rate may be affected due to its small area. Experiments have shown that when the diameter of the exhaust hole 12 is greater than 15 mm, the gas flow effect is better. It should be noted that when multiple exhaust slots 11 are provided, each exhaust channel can be individually configured with multiple exhaust holes 12, and the specific number of exhaust holes 12 can be adjusted according to actual needs and is not specifically limited here.
[0046] Furthermore, in order to optimize the chilling effect, in this solution, the core bone body 1 adopts a thick-walled structure and is made of gray cast iron, wherein the wall thickness of the core bone body 1 is ≥50 mm, and can be set to 50 mm, 60 mm or 70 mm according to actual needs, etc., and no specific restrictions are made here; here, by adopting a thick-walled structure, the volume proportion of the metal part of the core bone body 1 is higher, wherein a larger volume proportion means that more metal parts are involved in heat conduction, the heat conduction action is faster, and the chilling effect is further optimized and improved.
[0047] In addition, continue to refer to Figure 4 In the process of assembling the core bone body 1 to the mold, due to its large size and heavy weight, in order to better carry the core bone body 1, a lifting part 3 for lifting the core bone body 1 is also provided at the top of the core bone body 1. In this embodiment, the lifting part 3 is a lifting hole 31 structure. The lifting hole 31 passes through the opposite sides of the core bone body 1 along the direction perpendicular to the axis of the core bone body 1. At this time, a rope structure such as a steel cable can be inserted into the lifting hole 31, and the core bone body 1 can be lifted in conjunction with a gantry crane.
[0048] The implementation principle of the embodiment of the present application is: during the casting process of the casting, the molten iron contacts the resin sand layer on the outside of the core body 1, and the heat is transferred to the core body 1 through the resin sand layer. At this time, under the heat, the exhaust rope 2 filled in the exhaust groove 11 disappears, exposing the exhaust groove 11 and forming an exhaust channel. At this time, the gas expanded in the mold cavity is discharged to the outside of the mold cavity through the exhaust groove 11 and the exhaust hole 12, which has a chilling effect, thereby making the hole surface of the casting dense and coherent.
[0049] Example 2:
[0050] On the basis of the first embodiment, the features not explained in the present embodiment adopt the explanations in the first embodiment and will not be described again here. The difference between the present embodiment and the first embodiment is that the structure of the hoisting part 3 is different.
[0051] Reference Figure 6In this embodiment, the lifting part 3 is a lifting rod 32 with a rod-shaped structure, which is located at one end of the core bone body 1 and is located in the hollow interior thereof. The two ends of the lifting part 3 are respectively connected to the inner walls on the opposite sides of the core bone body 1 as a whole. At this time, by hooking the rod body, the entire core bone body 1 can also be lifted.
[0052] In addition, the number of rod structures can be multiple, such as two, three, etc. Figure 7 When two rods are provided, the two rods cross each other and are integrally connected to each other. Through this setting, rope lifting can also be achieved, which is more convenient to use.
[0053] Example 3:
[0054] On the basis of the first embodiment, the features not explained in the present embodiment adopt the explanations in the first embodiment and will not be described again here. The difference between the present embodiment and the first embodiment is that the structure of the hoisting part 3 is different.
[0055] Reference Figure 8 In this embodiment, the lifting portion 3 is a semi-annular structure, which is defined as a lifting ring 33. The lifting portion 3 is fixedly installed at one end of the core bone body 1. By grabbing the lifting ring, the core bone body 1 can also be lifted. The structure is practical.
[0056] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A porous sand core chilling core, comprising a core body (1), characterized in that: The core body (1) is hollow inside and has a thick-walled structure; an exhaust groove (11) is provided on the outer surface of the core body (1), and the exhaust groove (11) is filled with an exhaust rope (2). The exhaust rope (2) is burned and carbonized at a high pouring temperature, and an exhaust channel communicating with the outside is formed in the exhaust groove (11).
2. The porous sand core chilling core according to claim 1, characterized in that: The exhaust groove (11) extends along the length direction of the core body (1) and opens at the end faces of both ends of the core body (1).
3. The porous sand core chilling core according to claim 1, characterized in that: There are multiple exhaust grooves (11), and the multiple exhaust grooves (11) are arranged at intervals along the circumferential direction of the core body (1).
4. The chilled core of a porous sand core according to any one of claims 1 to 3, characterized in that: The core body (1) is provided with a plurality of exhaust holes (12), and the two ends of the exhaust holes (12) are respectively communicated with the interior of the core body (1) and the bottom of the exhaust groove (11).
5. The porous sand core chilling core according to claim 4, characterized in that: The diameter of the exhaust hole (12) is ≥15 mm.
6. The porous sand core chilling core according to claim 1, characterized in that: The wall thickness of the core bone body (1) is ≥50 mm.
7. The chilled core bone for porous sand cores according to claim 1, characterized in that: The cross section of the exhaust groove (11) is a semicircular profile, and the cross section radius of the exhaust groove (11) is greater than or equal to 10 mm.
8. The porous sand core chilling core according to claim 1, characterized in that: The exhaust rope (2) is a nylon rope, which is wound along the exhaust groove (11) and gathered into the hollow interior of the cylinder.
9. The porous sand core chilling core according to claim 1, characterized in that: The top end of the core bone body (1) is provided with a hoisting portion (3) for hoisting the core bone body (1).
10. The chilled core bone for porous sand cores according to claim 1, characterized in that: The core body (1) is made of gray cast iron.