A coated sand casting mold with a core

Abstract

This utility model relates to the field of sand casting technology and is a core-coated sand casting mold. It includes an upper mold and a lower mold capable of separation, and a cavity with an opening at one end formed by the closing of the upper and lower molds. The cavity wall has sand injection holes, and a core is inserted into the cavity through a gap. A stopper for sealing the cavity opening is correspondingly provided at the outer end of the core. A telescopic cylinder is connected to the outer end face of the core, capable of moving the core from the opening and detaching it from the cavity. The stopper is a retaining ring that fits around the outer end wall of the core, divided into an upper ring segment fixed to the core and a lower ring segment fixed to the lower mold. A base plate is provided below the core. The lower mold and the cylinder body of the telescopic cylinder are respectively fixedly installed at both ends of the base plate. A support block is fixed in the middle of the upper surface of the base plate, with the upper surface of the support block lower than the upper ring segment and capable of sliding contact with the lower wall surface of the core. This casting mold can prevent core displacement from causing difficulties in mold closing, thus improving production efficiency and quality.

Description

Technical Field

[0001] This utility model relates to the field of sand casting technology, and in particular to a coated sand casting mold with a core. Background Technology

[0002] As is generally known, the coated sand shell manufacturing process uses a core-shooting machine for core forming. However, some products produced using coated sand have a hollow structure. This structure places higher demands on the mold, requiring a sliding core to produce the hollow shell; see attached... Figure 1 As shown, there is a gap between the core and the mold cavity. When the core moves into the mold cavity, the stop blocks the opening of the mold cavity, forming a sealed space inside the cavity. Only the sand injection hole connects to the outside. High-temperature coated sand enters the cavity through the sand injection hole, cools and solidifies. Then, the core is removed from the mold cavity by the action of high-pressure air. The operator removes the coated sand shell and proceeds to the next process. Because the core needs to be sufficiently dense and has a large weight, and is always in a suspended state, the gravity is transmitted to the inner wall of the cylinder, which puts great pressure on the inner wall of the cylinder. After long-term operation, the inner wall of the cylinder is easily scratched, and the piston rod will sag and deform, which will cause the core to tilt and fail to close the mold properly, affecting the quality of the produced shell. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art and solve the existing technical problems, this utility model discloses a coated sand casting mold with a core, which can prevent core displacement from causing difficulties in mold closing and improve production efficiency and quality.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A core-coated sand casting mold includes an upper mold and a lower mold capable of separation, and a cavity with an opening at the end formed by the upper and lower molds. The cavity wall is provided with sand injection holes, and a core is inserted into the cavity with gaps. A stop for sealing the cavity opening is provided at the outer end of the core. A telescopic cylinder is connected to the outer end face of the core, which can move the core away from the opening and detach it from the cavity. The stop is a retaining ring that fits around the outer end wall of the core. The retaining ring is divided into an upper ring segment fixed to the core and a lower ring segment fixed to the lower mold. A base plate is provided below the core. The lower mold and the cylinder body of the telescopic cylinder are respectively fixedly installed at both ends of the base plate. A support block is fixed in the middle of the upper plate of the base plate. The upper surface of the support block is lower than the upper ring segment and can slide in contact with the lower wall surface of the core.

[0006] Furthermore, the core is a cylinder with a chamfer at its inner end, and the telescopic rod of the telescopic cylinder is coaxially fixed to the outer end face of the core.

[0007] Furthermore, the upper surface of the support block is designed to be an arc surface that adapts to the core wall surface.

[0008] Furthermore, the upper mold and the lower mold are arranged symmetrically.

[0009] Furthermore, the telescopic cylinder is configured as a pneumatic cylinder.

[0010] Furthermore, the retaining ring and the support block are made of wear-resistant material.

[0011] By adopting the technical solution described above, this utility model has the following beneficial effects:

[0012] The coated sand casting mold with core disclosed in this utility model, by dividing and modifying the baffle, ensures that the cavity is sealed while avoiding the support block. This allows the support block to slide and support the core, reducing damage to the telescopic cylinder and increasing its service life. At the same time, it ensures that the core, after being supported and constrained, will not tilt or wobble during long-distance movement, thus avoiding collisions with the mold and the inability to close the mold. This improves production efficiency and ensures the production quality of the coated sand shell mold. Attached Figure Description

[0013] Figure 1 This is a 3D schematic diagram of an existing mold;

[0014] Figure 2 This is a three-dimensional schematic diagram of the embodiment of this utility model;

[0015] Figure 3 This is a front view schematic diagram of the embodiment structure of this utility model.

[0016] In the diagram: 1. Telescopic cylinder; 2. Stop; 201. Upper ring section; 202. Lower ring section; 3. Core; 4. Sand injection hole; 5. Cavity; 6. Lower mold; 7. Base plate; 8. Support block. Detailed Implementation

[0017] The technical solution of this utility model will be described below with reference to the accompanying drawings of the embodiments of this utility model. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" indicating the orientation or positional relationship, they are only corresponding to the drawings of this utility model for the convenience of describing this utility model, and do not indicate or imply that the device or element referred to must have a specific orientation.

[0018] Combined with appendix Figure 2 and 3 The core-coated sand casting mold includes an upper mold and a lower mold 6 capable of separation, and a cavity 5 with an opening at the end formed by the closing of the upper mold and the lower mold 6, as shown in the attached figure. Figure 1As shown, the upper mold is omitted from the drawing, but in actual application, the upper mold and lower mold 6 are symmetrically arranged. The upper mold moves upward to separate during mold parting, and the cavity 5 formed after mold closing is divided equally between the upper mold and the lower mold 6. Similarly, the opening of the cavity 5 is also divided equally between the upper mold and the lower mold 6. A sand injection hole 4 is provided on one side of the cavity wall of the cavity 5, through which sand is injected into the cavity 5. A core 3 is inserted into the cavity 5 through the gap. Generally, the core 3 is set as a cylinder according to the needs of the shell, and the inner end of the core 3 is chamfered to facilitate insertion from the opening of the cavity 5. A stop 2 for sealing the opening of the cavity 5 is provided on the outer end of the core 3. The existing stop 2 is as follows: Figure 1 As shown, it is fixed to the outer end face of the core 3 and moves with the core 3. When the core 3 is inserted into the cavity 5, it can just block the opening of the cavity 5. The outer end face of the core 3 is connected to a telescopic cylinder 1 that can drive the core 3 to move from the opening and get out of the cavity 5. Generally, the telescopic rod of the telescopic cylinder 1 is coaxially fixed to the outer end face of the core 3. The core 3 is moved by the telescopic rod extending and retracting.

[0019] Unlike existing technologies, the retaining member 2 is designed as a retaining ring that fits around the outer end wall of the core 3. The outer end face of the retaining ring is flush with the outer end face of the core 3, and the retaining ring can be made of a high-temperature resistant and wear-resistant material, such as plastic, rubber, or alloy. The retaining ring is divided into an upper ring section 201 fixed to the core 3 and a lower ring section 202 fixed to the lower mold 6, ensuring that after the core 3 is inserted into the cavity 5 and moved into place, the upper ring section 201 and the lower ring section 202 can merge to seal the opening of the cavity 5. A base plate 7 is provided below the core 3, and the lower mold 6 and the cylinder body of the telescopic cylinder 1 are respectively fixedly installed on the upper plate of the base plate 7. At both ends of the base plate 7, a support block 8 is fixed in the middle of the upper plate. The upper surface of the support block 8 is lower than the upper ring section 201 and can slide in contact with the lower wall of the core 3. This ensures that the support block 8 provides sliding support for the core 3 while preventing it from hitting the upper ring section 201 and causing obstruction. The upper surface of the support block 8 is smooth and has low friction, ensuring that the core 3 slides smoothly. The support block 8 can also be made of wear-resistant material. When the core 3 is a cylinder, the upper surface of the support block 8 can be made into an arc surface that fits the wall of the core 3 as needed, increasing the support area and limiting the up-down and back-and-forth swing of the core 3.

[0020] The coated sand casting mold with core 3 of this utility model is used to control the core 3 to move to the right when the upper mold and lower mold 6 are closed for production. With the support of the support block 8, the core 3 is stably inserted into the cavity 5 without shaking. After the core is inserted into place, the upper ring section 201 and the lower ring section 202 can be closed to seal the opening of the cavity 5. Then, high-temperature coated sand is injected into the cavity 5 through the sand injection hole 4. After cooling and forming, the mold is separated and the core is removed. Then the sand shell is removed for subsequent production.

[0021] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the above embodiments should be regarded as exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims in this utility model, and no reference numerals in the claims should be regarded as limiting the content of the claims.

Claims

1. A core-coated sand casting mold, comprising an upper mold and a lower mold (6) capable of separation, and a cavity (5) with an opening at the end formed by the upper mold and the lower mold (6) being joined together, wherein the cavity (5) has a sand injection hole (4) in its cavity wall, a core (3) is inserted into the cavity (5) with a gap, and a stop (2) for sealing the opening of the cavity (5) is provided at the outer end of the core (3), and a telescopic cylinder (1) is connected to the outer end face of the core (3) to drive the core (3) to move away from the opening and disengage from the cavity (5), characterized in that: The stop (2) is a retaining ring that is fitted around the outer end wall of the core (3). The retaining ring is divided into an upper ring section (201) fixed to the core (3) and a lower ring section (202) fixed to the lower mold (6). A base plate (7) is provided below the core (3). The cylinder bodies of the lower mold (6) and the telescopic cylinder (1) are respectively fixedly installed at both ends of the upper plate surface of the base plate (7). A support block (8) is fixed in the middle of the upper plate surface of the base plate (7). The upper surface of the support block (8) is lower than the upper ring section (201) and can slide in contact with the lower wall surface of the core (3).

2. The cored coated sand casting mold of claim 1, wherein: The core (3) is a cylinder, and the inner end of the core (3) is chamfered. The telescopic rod of the telescopic cylinder (1) is coaxially fixed to the outer end face of the core (3).

3. The coated sand casting mold with core as described in claim 2, characterized in that: The upper surface of the support block (8) is set to be an arc surface that adapts to the wall of the core (3).

4. The cored coated sand casting mold of claim 1, wherein: The upper mold and the lower mold (6) are symmetrically arranged.

5. The cored coated sand casting mold of claim 1, wherein: The telescopic cylinder (1) is configured as a pneumatic cylinder.

6. The cored coated sand casting mold of claim 1, wherein: The retaining ring and support block (8) are made of wear-resistant material.

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