A core box structure for casting and a core making method of manual sand filling

Abstract

The invention discloses a core box structure for casting and a core making method of manually filling sand, which comprises a locking screw, an upper core box mold, a lower core box mold and a demolding fixture, wherein the upper core box mold and the lower core box mold are locked at the side by the locking screw; when opening the mold, the box ears are hooked by the claws on both sides of the demolding fixture, and a core push screw, a core push plate and a core push rod are arranged on the top of the demolding fixture to push and press the solidified sand core, so as to facilitate the separation of the upper and lower core box molds. The core box structure of the present design simulates the core box structure of the core shooting machine in the absence of a core shooting machine, and the core sand is filled into the core box by manually folding the soft air tube and releasing the gas to make the soft air tube release the pressure instantly, and then the core sand is manually blown and solidified to make a thin-walled complex sand core; this process is completed manually without the assistance of a machine, and various core boxes can be operated, which is convenient and flexible, conducive to the development of new products and small batch production operations, and breaks the barrier that complete thin-walled complex sand cores cannot be completed manually.

Description

Technical Field

[0001] The invention relates to the technical field of casting, in particular to a core box structure for casting and a core making method of manual sand filling. Background Art

[0002] At present, the thin-walled complex sand cores made in foundries are mainly made with cold core machines and hot core machines, which are suitable for mass production. When small batches and new product trials are not matched with core shooting machines, the thin-walled complex sand core molds can generally only be made by upper and lower molds. The upper and lower molds are filled with cold core sand and tamped tightly, placed in the amine gas box, and then sealed and blown into amine gas for curing. After the sand core is cured, it needs to be demolded, and the upper and lower sand cores are bonded together to get a complete sand core. It takes about 20-30 minutes to complete a sand core. The operation is complicated, the production efficiency is low, and the cost is high. Therefore, when casting, in the absence of a suitable core shooting machine, it is necessary to design a core box structure for manual core making to improve the production efficiency of manual core box core making.

[0003] The disclosure of the above background technology content is only used to assist in understanding the concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Summary of the invention

[0004] In view of the above technical problems, the present invention provides a core box structure for casting and a core making method of manual sand filling, so as to improve the production efficiency of manual core box core making.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A core box structure for casting, comprising a locking screw, an upper core box mold, and a lower core box mold; the upper core box mold and the lower core box mold are locked at the side by the locking screw, a plurality of sand feeding holes are arranged on the top of the upper core box mold, and box ears are arranged on the side walls of the upper core box mold and the lower core box mold; it also includes a demolding fixture, the two sides of the demolding fixture are arranged in a curved hook shape for hooking the box ears, a core push screw is arranged on the top of the demolding fixture, a core push screw is movably installed below the core push screw, and a core push rod that matches the gap of the sand feeding hole is arranged on the plate surface of the core push rod.

[0007] Furthermore, the core box structure also includes an air blowing nozzle and a sand filling nozzle movably connected to the sand inlet hole, and the sand filling nozzle and the air blowing nozzle are respectively connected to the soft air pipe.

[0008] Furthermore, there are four locking screws.

[0009] Furthermore, the number of the sand inlet holes is 25.

[0010] Furthermore, the diameter of the sand inlet hole is 12 mm, and the inclination of the sand inlet hole is 3 degrees.

[0011] A core box structure designed in the present invention further provides a core making method of manual sand filling, which is based on the core box structure of the present invention and includes the following steps:

[0012] The first step is to assemble the core box and fasten the split upper and lower core box molds with four locking screws;

[0013] The second step is to fill the sand. Before filling the sand and making the core, first use an iron block to block the sand inlet hole and reserve a sand inlet hole without the iron block for blocking. When filling the sand and making the core, fold the soft air pipe, use the sand filling nozzle to manually tamp the cold core sand, use the viscosity of the cold core sand to make the core sand adhere to the sand filling nozzle, then press the sand filling nozzle against the reserved sand inlet hole, release the gas at the same time, and use the instantaneous release of gas pressure to fill the core sand into the core box until it is full. Then move the iron block next to it to block the sand inlet hole that has just been filled, and then use the sand filling nozzle to repeat the sand filling operation on the sand inlet hole where the iron block has just been removed, until all the sand inlet holes of the core box are filled, and the entire core box sand filling work is completed.

[0014] The third step is solidification. After the entire core box sand filling work is completed, remove all iron blocks, drip solidifying liquid into each sand inlet hole to solidify all the sand inlet holes, and then use a blowing nozzle to blow air to all the solidified sand inlet holes;

[0015] The fourth step is to dismantle the mold. After the sand core is solidified, first remove the locking screw and put on the top core plate, so that the top core rod on the top core plate is aligned with the sand inlet hole; secondly, use the mold-lifting fixture to hook the two box ears on the side wall of the upper core box mold, and tighten the top core screw with a wrench to slowly separate the upper core box mold from the sand core in the core box until the upper core box mold is completely separated from the sand core in the core box, then remove the mold-lifting fixture, top core plate, and upper core box mold; then use a rubber hammer to gently tap the outer wall of the lower core box mold to separate the sand core from the lower core box mold;

[0016] The fifth step is to take out the sand core to obtain a complete thin-walled complex sand core.

[0017] Furthermore, the solidifying liquid in the third step is triethylamine.

[0018] Furthermore, the dosage of the triethylamine amine water is 0.3% of the weight of the sand core.

[0019] Furthermore, the blowing time of the third step is 5-10 seconds.

[0020] The beneficial effects of the present invention compared with the prior art are as follows:

[0021] (1) The core box structure of this design can be used to cast thin-walled complex sand cores without a core shooting machine. It is equipped with an exhaust plug and a sand shooting channel. The soft air tube is folded manually to release gas so that the air tube can instantly release pressure to fill the core sand into the core box. Then, amine is manually blown to solidify the core to make a thin-walled complex sand core. This process is completed manually without the need for machine assistance. Various core boxes can be operated, which is convenient and flexible, conducive to new product development and small-batch production operations, and breaks the barrier that complete thin-walled complex sand cores cannot be completed manually.

[0022] (2) Use the demoulding fixture to hook the two box ears of the upper core box mold, and use a wrench to tighten the top core screw to slowly separate the upper core box mold from the sand core in the core box until the upper core box mold is completely separated from the sand core in the core box. This demoulding method effectively improves the production efficiency of manual core box core making and is convenient and flexible to operate.

[0023] (3) The dosage of triethylamine water is 0.3% of the weight of the sand core, which helps to ensure that the amine water can fully contact and solidify with the core sand in the core box, so that the sand core can easily reach the highest strength and save amine water at the same time.

[0024] (4) The blowing time during core making is 5-10 seconds, which is conducive to ensuring that the amine water can fully contact and solidify with the core sand in the core box. If the blowing time is too long, it will cause over-blowing, waste amine water and gas, and the strength of the sand core will be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 1 is a schematic diagram of the core box structure for casting of the present invention;

[0026] Figure 2 Schematic diagram II of the core box structure for casting of the present invention.

[0027] Figure numerals: 1. iron block; 2. air blowing nozzle; 3. sand inlet hole; 4. sand filling nozzle; 5. soft air pipe; 6. locking screw; 7. upper core box mold; 8. lower core box mold; 9. top core plate; 10. top core rod; 11. demoulding fixture; 12. box ear; 13. top core screw; 14. sand core. DETAILED DESCRIPTION

[0028] A specific embodiment of the present invention is described in detail below in conjunction with the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited by the specific embodiment. It should be understood that the "up", "down", "left" and "right" directions mentioned in the following embodiments of the present invention are all based on the positions of the corresponding drawings. These words used to limit the direction are only for the convenience of explanation and do not represent limitations on the specific technical solutions of the present invention. Unless otherwise specified, the same numbers in the figure marks represent the same structure.

[0029] See also Figure 1 and Figure 2The present invention discloses a core box structure for casting, which includes a locking screw 6, an upper core box mold 7, and a lower core box mold 8; the upper core box mold 7 and the lower core box mold 8 in the present invention are locked at the side with four locking screws 6, and the top of the upper core box mold 7 is provided with 25 sand inlet holes 3, and the sand inlet holes 3 are arranged at the thicker and larger part of the sand core to avoid the situation of looseness and incompleteness when making the sand core. The diameter of the sand inlet hole 3 is 12 mm, and the slope is 3 degrees, which ensures efficient sand filling and the compactness of the sand core during core making. Box ears 12 are arranged on the side walls of the upper core box mold 7 and the lower core box mold 8. At the same time, the present invention also designs a mold-pulling fixture 11 used in conjunction with the core box structure. The two sides of the mold-pulling fixture 11 are arranged in a curved hook shape for hooking the box ears 12 of the side wall of the upper core box mold 7. A core-pushing rod 13 is arranged on the top of the mold-pulling fixture 11. A core-pushing plate 9 is movably installed below the core-pushing rod 13. A core-pushing rod 10 is arranged on the plate surface of the core-pushing plate 9 to match the gap with the sand inlet hole 3. Figure 1 When the core box structure is in use, the air blowing nozzle 2 and the sand filling nozzle 4 are connected through the sand inlet hole 3, and the sand filling nozzle 4 and the air blowing nozzle 2 are connected to the soft air pipe 5.

[0030] The core making method of the present invention using manual sand filling of the core box structure is mainly based on the core shooting principle of the core shooting machine. In the absence of a core shooting mechanism, the two sides of the split upper and lower core box molds are fastened with four locking screws 6, and the thin-walled complex sand core is made by manually filling cold core sand and dripping amine water and blowing to solidify. Figure 1 and Figure 2 The core making method comprises the following steps:

[0031] The first step is to assemble the core box and fasten the split upper and lower core box molds with four locking screws 6;

[0032] The second step is to fill the sand. Before filling the sand to make the core, the sand inlet hole 3 is first blocked with the iron block 1 and a sand inlet hole 3 is reserved without the iron block 1 for blocking. When filling the sand to make the core, the soft air pipe 5 is folded, and the cold core sand is manually pressed with the sand filling nozzle 4. The core sand is adhered to the sand filling nozzle 4 by the viscosity of the cold core sand, and then the sand filling nozzle 4 is pressed against the reserved sand inlet hole 3, and the gas is released at the same time. The core sand is filled into the core box by the instantaneous release of gas pressure until it is filled. Then the iron block 1 next to it is moved to block the sand inlet hole 3 that has just been filled, and the sand filling nozzle 4 is used to repeat the sand filling operation on the sand inlet hole 3 where the iron block 1 has just been removed, until all the sand inlet holes 3 of the core box are filled, and the whole core box sand filling work is completed.

[0033] The third step is curing. After the entire core box is filled with sand, all iron blocks 1 are removed, and triethylamine curing liquid is dripped into each sand inlet hole 3. The amount of triethylamine amine water used is 0.3% of the weight of the sand core; drip amine water to cure all the sand inlet holes 3, and then use the blowing nozzle 2 to blow air at all the cured sand inlet holes 3 for 8 seconds;

[0034] The fourth step is to dismantle the mold. After the sand core 14 is solidified, first remove the locking screw 6 and put the top core plate 9 on, so that the top core rod 10 on the top core plate 9 is aligned with the sand inlet hole 3; secondly, use the mold-lifting fixture 11 to hook the two box ears 12 on the side wall of the upper core box mold 7, and tighten the top core screw 13 with a wrench to slowly separate the upper core box mold 7 from the sand core 14 in the core box until the upper core box mold 7 is completely separated from the sand core 14 in the core box, then remove the mold-lifting fixture 11, the top core plate 9, and the upper core box mold 7; then use a rubber hammer to gently tap the outer wall of the lower core box mold 8 to separate the sand core 14 from the lower core box mold 8;

[0035] Step 5: Take out the sand core 14 to obtain a complete thin-walled complex sand core.

[0036] The core making method of the core box of the present invention has the following advantages: 1. Complete thin-walled complex sand cores can be completed manually without the need for machine assistance, and various core boxes can be operated, which is convenient and flexible; 2. It is conducive to new product development and small batch production operations; 3. It breaks the barrier that complete thin-walled complex sand cores cannot be completed manually.

[0037] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A core making method using manual sand filling, characterized in that: The invention comprises a core box structure for casting, wherein the core box structure comprises a locking screw, an upper core box mold and a lower core box mold; the upper core box mold and the lower core box mold are locked at the side by a locking screw, a plurality of sand feeding holes are arranged on the top of the upper core box mold, and box ears are arranged on the side walls of the upper core box mold and the lower core box mold; the invention also comprises a demolding fixture, wherein the two sides of the demolding fixture are arranged in a curved hook shape for hooking the box ears, a core top screw is arranged on the top of the demolding fixture, a core top plate is movably installed under the core top screw, and a gap with the sand feeding holes is arranged on the plate surface of the core top plate The invention also comprises a core push rod; an air blowing nozzle and a sand filling nozzle movably connected to the sand inlet hole, and the sand filling nozzle and the air blowing nozzle are respectively connected to the soft air pipe; the locking screw rods are four; and the following steps are also included: the first step is to assemble the core box, and fasten the separated upper and lower core box molds with four locking screw rods; the second step is to fill the sand, and before filling the sand to make the core, the sand inlet hole is first blocked with an iron block and a sand inlet hole is reserved without the iron block for blocking; when filling the sand to make the core, the soft air pipe is folded, and the cold core sand is manually pressed with the sand filling nozzle, and the core sand is adhered to the sand filling nozzle by utilizing the viscosity of the cold core sand, and then the sand filling nozzle is filled. Press against a reserved sand inlet hole and release the gas at the same time, and use the instantaneous release of gas pressure to fill the core sand into the core box until it is full; then move the iron block next to it to seal the sand inlet hole that has just been filled, and then use the sand filling nozzle to repeat the sand filling operation on the sand inlet hole where the iron block has just been removed, until all the sand inlet holes of the core box are filled, and the entire core box sand filling work is completed; the third step is solidification. When the entire core box sand filling work is completed, remove all the iron blocks, drip solidifying liquid into each sand inlet hole to solidify all the sand inlet holes, and then use the blowing nozzle to blow all the solidified Blow air into the sand hole; the fourth step is to dismantle the mold. After the sand core is solidified, first remove the locking screw and put on the top core plate, so that the top core rod on the top core plate is aligned with the sand inlet hole; secondly, use the mold-lifting fixture to hook the two box ears on the side wall of the upper core box mold, and tighten the top core screw with a wrench to slowly separate the upper core box mold from the sand core in the core box until the upper core box mold is completely separated from the sand core in the core box, then remove the mold-lifting fixture, top core plate, and upper core box mold; then use a rubber hammer to gently tap the outer wall of the lower core box mold to separate the sand core from the lower core box mold; the fifth step is to take out the sand core to obtain a complete thin-walled complex sand core.

2. The manual sand filling core making method according to claim 1, characterized in that: The number of the sand inlet holes is 25.

3. The manual sand filling core making method according to claim 1, characterized in that: The diameter of the sand inlet hole is 12 mm, and the inclination of the sand inlet hole is 3 degrees.

4. The manual sand filling core making method according to claim 1, characterized in that: The curing liquid in the third step is triethylamine.

5. The manual sand filling core making method according to claim 1, characterized in that: The blowing time in the third step is 5-10 seconds.

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