Exothermic riser placing structure

Abstract

The utility model discloses an exothermic riser placing structure which comprises a core box base and a core box arranged on the core box base, the core box and the core box base jointly form a cavity used for containing a sand core and a riser, and a riser positioning pin is fixed on the core box base and extends into the cavity to position the riser. The dead head is arranged in the cavity through a dead head positioning needle, and a nozzle is formed in the upper end of the core box and used for injecting sand into the cavity so that the sand core can tightly wrap the positioned dead head. By means of the mode, the exothermic riser containing structure can solve the problem of internal feeding of a casting of a complex structure, it can be guaranteed that a high exothermic riser is accurately arranged at the needed position of an inner cavity of the casting, the efficient feeding effect is achieved, the riser can be conveniently removed after the casting is completed, and therefore production difficulty and cost are reduced.

Description

Technical Field

[0001] This utility model relates to the field of casting technology, and in particular to a structure for placing a heating riser. Background Technology

[0002] With the progress and development of the times, increasingly stringent requirements have been placed on the quality standards of castings. To meet this demand, high-efficiency heat-generating risers, due to their small size and outstanding feeding efficiency, are widely used in the casting process, and their usage rate in the casting industry is constantly increasing.

[0003] Normally, rising vents are placed on the outer mold and carried away by the molding line machine. However, in actual production, some castings with complex structures require internal feeding, which makes the traditional outer mold placement method no longer applicable, because the rising vents cannot be easily carried away by the molding line machine in this case.

[0004] Especially in the central area of ​​the casting, shrinkage porosity is prone to occur due to the shrinkage effect during the metal cooling process. Conventional risers are difficult to effectively compensate for these internal defects, and their removal process is relatively cumbersome, increasing the workload. Utility Model Content

[0005] The main technical problem solved by this utility model is to provide a structure for placing a high-heat riser, which can solve the problem of internal feeding in complex castings. This structure can ensure that the high-heat riser is accurately placed in the required position in the inner cavity of the casting, achieving an efficient feeding effect. After the casting is completed, it is also easy to remove the riser, thereby reducing production difficulty and cost.

[0006] To solve the above-mentioned technical problems, the present invention provides a heating riser placement structure, comprising:

[0007] Core box base;

[0008] The core box is located on the core box base and together with the core box base, forms a cavity for accommodating the sand core and riser;

[0009] Riser positioning pins are fixed to the core box base and extend into the cavity to position the riser;

[0010] The riser is positioned in the cavity by a riser positioning pin. The upper end of the core box is provided with a nozzle for injecting sand into the cavity so that the sand core can tightly wrap the positioned riser.

[0011] In a preferred embodiment of the present invention, the core box base has a connecting hole that matches the riser positioning pin, and the riser positioning pin is fixed by cooperating with the riser positioning pin through the connecting hole.

[0012] In a preferred embodiment of the present invention, the riser has a guide positioning hole that matches the riser positioning pin. The riser is positioned in the cavity by cooperating with the riser positioning pin through the guide positioning hole.

[0013] In a preferred embodiment of the present invention, the riser positioning pin is rod-shaped and has a fixed section, a transition section and a guide section coaxially arranged from bottom to top along its axial direction.

[0014] In a preferred embodiment of this utility model, the fixing section is disposed in the connecting hole for fixed connection with the core box base.

[0015] In a preferred embodiment of the present invention, the connecting surface of the transition section and the fixed section forms a stepped surface, which is supported on the core box base to fix the riser positioning pin in a predetermined position.

[0016] In a preferred embodiment of this utility model, the transition section and the guide section together form a needle rod portion with a gradually decreasing taper, so as to realize the smooth introduction and positioning of the riser, and the guide section and the riser are in clearance fit.

[0017] In a preferred embodiment of the present invention, the transition section has an inclined surface that mates with the riser, and the inclined surface and the riser are in a clearance fit.

[0018] In a preferred embodiment of the present invention, at least two nozzles are provided, and the two nozzles are symmetrically arranged in the top area of ​​the core box.

[0019] The beneficial effects of this utility model are: by accurately positioning the riser with the riser positioning pin, tightly wrapping the riser with the sand core, and the feeding effect of the heating riser, the problem of shrinkage porosity in castings is effectively solved, and the quality and reliability of castings are improved. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0021] Figure 1 This is a schematic diagram of the original state of the heating riser placement structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the present invention, showing the riser placed inside the core box and positioned by the riser positioning pin;

[0023] Figure 3 yes Figure 2A magnified view of part A in the image;

[0024] Figure 4 This is a schematic diagram of the structure of this utility model where sand is shot in so that the riser is wrapped by the sand core;

[0025] Figure 5 This is a schematic diagram of the structure of this utility model after the sand core has been removed;

[0026] The components in the attached diagram are labeled as follows:

[0027] 1. Core box base; 11. Connecting hole; 2. Core box; 3. Cavity; 4. Riser positioning pin; 41. Fixed section; 42. Transition section; 43. Guide section; 5. Riser; 51. Guide positioning hole; 6. Nozzle; 7. Step surface; 8. Inclined surface; 9. Sand core; 10. Riser inner cavity. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0030] This utility model relates to a preferred embodiment of a heating riser placement structure.

[0031] Please see Figure 1-5 The heating riser placement structure includes: a core box base 1 and a core box 2 disposed on the core box base 1, wherein the core box 2 and the core box base 1 together form a cavity 3 for accommodating the sand core and the riser.

[0032] First, a riser positioning pin 4 is fixed on the core box base 1. The riser positioning pin 4 extends into the cavity 3 to accurately and stably position the riser 5, ensuring that the riser 5 can be kept in the predetermined position during the subsequent casting process.

[0033] Secondly, the riser 5 is positioned in the cavity 3 via the riser positioning pin 4:

[0034] The core box base 1 has a connecting hole 11 that matches the riser positioning pin 4. The riser positioning pin 4 is fixed by cooperating with the riser positioning pin 4 through the connecting hole 11. The riser 5 has a guide positioning hole 51 that matches the riser positioning pin 4. The riser 5 is positioned in the cavity 3 by cooperating with the riser positioning pin 4 through the guide positioning hole 51.

[0035] Furthermore, the upper end of the core box 1 is provided with a nozzle 6 for injecting sand into the cavity 3 so that the sand core can tightly wrap the positioned riser 5.

[0036] Preferably, at least two nozzles 6 are provided, and the two nozzles 6 are symmetrically arranged in the top area of ​​the core box 1. The number and position of the nozzles 6 are to ensure that the sand can be injected evenly into the cavity and fully fill every corner of the cavity 3, and tightly wrap the riser 5, thereby enhancing the structural strength and sealing of the casting.

[0037] Based on the above structure, the riser positioning pin 4 is rod-shaped, and along its axial direction from bottom to top, it is coaxially provided with a fixing section 41, a transition section 42 and a guide section 43.

[0038] The fixing section 41 is located inside the connecting hole 11 and is used to fix it to the core box base 1. The shape and size of the fixing section 41 match the connecting hole 11 to ensure stable and firm assembly.

[0039] The transition section 42 and the fixed section 41 form a stepped surface 7. The stepped surface 7 is supported on the core box base 1 so that the riser positioning pin 4 is fixed in a predetermined position, which can ensure assembly stability and also ensure alignment during the assembly process, and quickly and accurately position the riser positioning pin 4.

[0040] The transition section 42 and the guide section 43 together form a needle rod section with a gradually decreasing taper, so as to facilitate the smooth introduction and positioning of the riser 5, while reducing friction and resistance during assembly. The guide section 43 and the riser 5 are clearance fit, allowing the riser a certain amount of room to move during thermal expansion and contraction, avoiding deformation or damage caused by stress concentration.

[0041] The transition section 42 has an inclined surface 8 that matches the riser 5, which provides guidance and positioning for the riser assembly. The inclined surface 8 and the riser 5 are in a clearance fit, ensuring that the fit is neither too tight nor too loose, allowing the riser some room to move under thermal expansion and contraction, thus enhancing the adaptability and durability of the casting.

[0042] The usage procedure of this utility model's heating riser placement structure is as follows:

[0043] First, the fixing section of the riser positioning pin 4 is accurately inserted into the connecting hole 11 of the core box base 1 to provide stable support for the subsequent assembly of the riser;

[0044] Next, the riser 5 is placed into the cavity 3 formed by the core box 2 and the core box base 1. During this process, the riser 5 needs to be precisely positioned with the riser positioning pin 4.

[0045] The guide positioning hole 51 at the top of the riser 5 will cooperate with the guide section 43 of the riser positioning pin 4, and the guide section 43 will be smoothly inserted into the guide positioning hole 51. At the same time, the bottom of the riser 5 will be tightly fitted with the inclined surface 8 of the transition section 42.

[0046] Subsequently, sand is injected into the cavity 3 through the nozzle 6 at the top of the core box 2. The sand is injected into the cavity 3 under high pressure, tightly wrapping the riser 5 to form the sand core 9. During this process, the riser positioning pin 4 ensures that the position of the riser 5 is stable during the sand injection process, preventing the leakage of sand and the movement of the riser, thereby ensuring the integrity and high quality of the sand core.

[0047] Finally, once the sand core 9 has completely solidified, the sand core 9 and riser 5 can be removed from the cavity 3. At this point, the riser cavity 10 is ready to store molten iron, ensuring that the molten iron can be filled evenly and fully, thereby casting a casting that meets the requirements.

[0048] The beneficial effects of the heating riser placement structure of this utility model are:

[0049] The riser is precisely positioned by the riser positioning pin, which prevents the riser from moving or misaligning during the sand core formation process. This avoids shrinkage porosity in the casting caused by inaccurate riser positioning, greatly improving the accuracy and efficiency of the casting process. The removal of the riser after the casting is formed is also much simpler.

[0050] The sand tightly wraps around the riser, ensuring its stability during the casting process. It works in conjunction with a high-heat riser to provide additional heat during casting, promoting the feeding of the molten metal. When the molten metal solidifies, the high-heat riser can continuously provide heat, keeping the molten metal at a certain level of fluidity, thereby filling the pores caused by solidification shrinkage and reducing the occurrence of shrinkage porosity in the casting.

[0051] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A heat generating feeder placement structure characterized by, It comprises: a core box base; a core box, which is arranged on the core box base and cooperates with the core box base to form a cavity for accommodating a sand core and a riser; a riser positioning needle, which is fixed on the core box base and extends into the cavity for positioning the riser; the riser is arranged in the cavity through the riser positioning needle, and a nozzle is arranged on the upper end of the core box for injecting sand into the cavity so that the sand core can tightly wrap the positioned riser.

2. The heat generating riser placement structure of claim 1, wherein The core box base has a connecting hole matched with the riser positioning needle, and the fixing of the riser positioning needle is realized through the cooperation of the connecting hole and the riser positioning needle.

3. The heat generating riser placement structure of claim 2, wherein The riser has a guide positioning hole matched with the riser positioning needle, and the positioning of the riser in the cavity is realized through the cooperation of the guide positioning hole and the riser positioning needle.

4. The heat generating riser placement structure according to claim 3, wherein The riser positioning needle is in the shape of a rod, and a fixed section, a transition section and a guide section are coaxially arranged along the axial direction of the needle from bottom to top.

5. The heat generating riser placement structure of claim 4, wherein The fixed section is arranged in the connecting hole for fixed connection with the core box base.

6. The exothermic feeder placement structure according to claim 4, wherein The joint surface between the transition section and the fixed section forms a stepped surface, which is supported on the core box base to fix the riser positioning needle at a predetermined position.

7. The exothermic feeder placement structure according to claim 4, wherein The transition section and the guide section jointly form a needle rod part with gradually decreasing taper to realize smooth introduction and positioning of the riser, and the guide section is in clearance fit with the riser.

8. The exothermic feeder placement structure according to claim 4, wherein The transition section has an inclined surface matched with the riser, and the inclined surface is in clearance fit with the riser.

9. The exothermic feeder placement structure according to claim 1, wherein The nozzle is provided with at least two nozzles, and the two nozzles are symmetrically arranged in the top region of the core box.

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