Casting self-hardening sand mold closing positioning device

Abstract

The utility model relates to the field of casting, in particular to a casting self-hardening sand box closing positioning device, which is characterized in that an upper positioning body is connected inside an upper sand box, a conical barrel I and a sealing top form a positioning cavity outside the upper sand box, a lower sand box is connected on the top surface of a lower template, the lower sand box forms a convex sand mold inside a conical barrel II and the sealing bottom, and the convex sand mold is inserted into the positioning cavity; in the molding process of the sand box, the upper positioning body and the lower positioning body are used for forming the positioning cavity and the convex sand mold on the upper sand box and the lower sand box, the positioning cavity and the convex sand mold are connected for positioning when the sand box is closed, accidental parts such as positioning pins of the sand box do not need to be used, the risk that the parts fall off and are lost is avoided, and the production efficiency is improved. And the integrity of the positioning cavity and the convex sand mold and the sand mold is high, so that the fit clearance and the positioning dislocation are reduced, and the box staggering problem is avoided.

Description

Technical Field

[0001] The utility model relates to the field of casting, in particular to a casting self-hardening sand box positioning device. Background Art

[0002] In the traditional self-hardening sand casting production process, upper and lower sand boxes are usually used for molding. Many castings are usually molded using templates, and the positioning device is generally positioned using sand molds made of self-hardening sand. Sand mold positioning can play a certain role, but during use, due to the large clearance fit, it is easy to cause the casting to be misaligned, and the sand mold positioning has poor shear resistance and is easy to break, resulting in inaccurate positioning.

[0003] In order to solve the above-mentioned technical problems, the prior art can use a box-closing locating pin. For example, the prior art patent number is CN201810795312.4, and the patent name is an invention patent of a thin and tall casting box-closing locating pin, which discloses a thin and tall casting box-closing locating pin, including a locating pin body. The locating pin body is an asymmetric frustum of a cone with a large middle and small ends, which can be divided into an upper part and a lower part. The upper part is a thin and tall frustum of a cone with a smaller taper, and the lower part is a frustum of a cone with a larger taper. The boundary between the upper and lower parts is the bottom surface of the frustum of the cone. When the upper box sand mold and the lower box sand mold are combined, the lower part of the locating pin is placed in the lower locating pit that matches the shape of the lower part, and the upper part of the locating pin is aligned with the upper locating pit that matches the shape of the upper part, so as to facilitate the accurate positioning of the crane for the box-closing. The closing locating pin is simple and reliable, and facilitates accurate positioning and closing operations of tall and thin-walled box castings by increasing the upper height of the locating pin and the closing height of the upper locating pit that matches the shape of the upper part, thereby avoiding the closing disadvantages of traditional symmetrical locating pins and the unstable closing, which is prone to sanding and misalignment.

[0004] The above-mentioned prior art has the problem that the locating pins are not large in size and are easy to be lost, or even omitted in the sand mold due to negligence of the staff, which causes serious problem of scrapping of castings. At the same time, it is necessary to set grooves for placing the locating pins on the upper sand box and the lower sand box, and the setting of the grooves should be consistent with the size of the locating pins as much as possible. If they are not consistent, it is easy to cause deviation between the locating pins and the grooves when the boxes are closed.

[0005] The prior art patent number is CN201721292815.7, and the patent name is a utility model patent for a self-hardening sand casting box positioning device. The principle of positioning is also to use positioning pins. In order to solve the problem of grooves for placing positioning pins on the upper and lower sand boxes, this prior art provides upper and lower positioning bodies. When in use, the upper and lower positioning bodies are fixed inside the upper and lower sand boxes. When the boxes are closed, the positioning pins are connected to the upper and lower positioning bodies. However, when this prior art is used, the upper and lower positioning bodies are fixed inside the upper and lower sand boxes and cannot be removed. If multiple products are cast at the same time, multiple upper and lower positioning bodies need to be processed for use, and there is still the problem that the positioning pins are easily lost accidentally. Utility Model Content

[0006] The purpose of the utility model is to provide a self-hardening sand casting box positioning device, which solves the problem of poor positioning accuracy of the self-hardening sand positioning device due to its poor shear resistance and large matching clearance during the positioning process. At the same time, after the box is closed, no positioning pins or positioning bodies are retained in the sand box, which is convenient to use.

[0007] In order to solve the above technical problems, the utility model discloses a self-hardening sand box positioning device for casting, which comprises an upper positioning body, a lower positioning body, an upper sand box, an upper template, a lower sand box and a lower template. The upper positioning body comprises a connecting flange I, a cone barrel I and a capping, the cone barrel I is a cone barrel with a small top diameter and a large bottom diameter, the connecting flange I is fixedly connected to the bottom end of the cone barrel I, the capping is fixedly connected to the top end of the cone barrel I, the connecting flange I is fixedly connected to the top surface of the upper template, the cone barrel I and the capping are arranged above the top surface of the upper template, and the upper The sand box is connected to the top surface of the upper template, the upper positioning body is connected to the inside of the upper sand box, the cone barrel I and the top cover form a positioning cavity outside the upper sand box, the lower positioning body includes a connecting flange II, a cone barrel II and a bottom cover, the cone barrel II is a cone barrel with a large top diameter and a small bottom diameter, the connecting flange II is fixedly connected to the top surface of the lower template, the cone barrel II and the bottom cover are sunk into the lower sand box, the lower sand box is connected to the top surface of the lower template, the lower sand box forms a convex sand mold inside the cone barrel II and the bottom cover, and the convex sand mold is inserted into the positioning cavity.

[0008] Furthermore, a flange groove I is provided on the top surface of the upper template, and the connecting flange I is connected in the flange groove I, and the depth of the flange groove I is the same as the thickness of the connecting flange I.

[0009] Furthermore, a flange groove II is provided on the top surface of the lower template, a placement hole is provided on the bottom surface of the flange groove II, the connecting flange II is connected in the flange groove II, the depth of the flange groove II is the same as the thickness of the connecting flange II, and the cone barrel II and the bottom cover are connected in the placement hole.

[0010] Furthermore, the connecting flange I is provided with a plurality of countersunk holes I, which are evenly distributed around the circumference of the connecting flange I axis; the bottom surface of the flange groove I is provided with a plurality of screw holes I, which are coaxial with the plurality of countersunk holes I one by one; each screw hole I is connected to each countersunk hole I by a countersunk screw, and the head of the countersunk screw is sunk into the countersunk hole I.

[0011] Furthermore, the connecting flange II is provided with a plurality of countersunk holes II, which are evenly distributed around the circumference of the connecting flange II axis; the bottom surface of the flange groove II is provided with a plurality of screw holes II, which are coaxial with the plurality of countersunk holes II one by one; each screw hole II is connected to each countersunk hole II by a countersunk screw, and the head of the countersunk screw is sunk into the countersunk hole II.

[0012] As an embodiment of the utility model, the top cover is a flat plate; the bottom cover is a flat plate; that is, the top of the positioning cavity formed by the upper positioning body in the upper sand box is a plane, and the top of the convex sand mold formed by the lower positioning body in the lower sand box is a plane.

[0013] As another embodiment of the utility model, the top cover is hemispherical; the bottom cover is hemispherical. That is, the top of the positioning cavity formed by the upper positioning body in the upper sand box is a spherical top, and the top of the convex sand mold formed by the lower positioning body in the lower sand box is a spherical top.

[0014] Furthermore, there is a 0.5 mm gap between the raised sand mold and the positioning cavity.

[0015] The beneficial effects of the utility model are as follows: the utility model utilizes the upper positioning body and the lower positioning body to form a positioning cavity and a convex sand mold on the upper sand box and the lower sand box during the sand box molding process; the positioning cavity and the convex sand mold are connected for positioning when the sand boxes are closed; there is no need to use unexpected parts of the sand box such as positioning pins, thereby avoiding the risk of parts falling and losing; the positioning cavity and the convex sand mold have high integrity with the sand mold, reducing the fitting gap and positioning misalignment, avoiding the occurrence of misalignment problems, meeting the positioning requirements for the closing of self-hardening sand castings, and ensuring smooth work; the upper positioning body and the lower positioning body can be continuously used for the production of sand boxes, which is beneficial to improving work efficiency when multiple sand boxes are produced at the same time and the reuse rate of the sand boxes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of an upper positioning body according to Embodiment 1 of the present utility model;

[0017] Figure 2 This is a schematic structural diagram of the lower positioning body of the first embodiment of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the upper template of the utility model;

[0019] Figure 4 It is a schematic diagram of the structure of the lower template of the utility model;

[0020] Figure 5 It is a schematic diagram of the local structure of the connection between the upper sand box, the upper positioning body and the upper template in the first embodiment of the utility model;

[0021] Figure 6 It is a schematic diagram of the local structure of the connection between the lower sand box, the lower positioning body and the lower template in the first embodiment of the utility model;

[0022] Figure 7 It is a schematic diagram of the partial structure of the upper sand box and the connection of the upper sand box in the first embodiment of the utility model;

[0023] Figure 8 This is a schematic structural diagram of an upper positioning body according to Embodiment 2 of the present utility model;

[0024] Fig. 9 This is a schematic structural diagram of the lower positioning body of the second embodiment of the utility model;

[0025] Fig.10 It is a partial structural schematic diagram of the connection between the upper sand box, the upper positioning body and the upper template in the second embodiment of the utility model;

[0026] Fig.11 It is a partial structural schematic diagram of the connection between the lower sand box, the lower positioning body and the lower template in the second embodiment of the utility model;

[0027] Fig.12 It is a schematic diagram of the partial structure of the upper sand box and the connection of the upper sand box in the second embodiment of the utility model.

[0028] In the figure: 1. upper positioning body; 101. connecting flange Ⅰ; ​​102. countersunk hole Ⅰ; 103. cone barrel Ⅰ; 104. top cover; 2. lower positioning body; 201. connecting flange Ⅱ; 202. countersunk hole Ⅱ; 203. cone barrel Ⅱ; 204. bottom cover; 3. upper sand box; 4. upper template; 401. flange groove Ⅰ; 402. screw hole Ⅰ; 5. positioning cavity; 6. lower sand box; 7. lower template; 701. flange groove Ⅱ; 702. placement hole; 703. screw hole Ⅱ; 8. raised sand mold. DETAILED DESCRIPTION

[0029] Embodiment 1:

[0030] like Figure 1-Figure 7As shown, the utility model is a casting self-hardening sand box positioning device. Embodiment 1 includes an upper positioning body 1, a lower positioning body 2, an upper sand box 3, an upper template 4, a lower sand box 6 and a lower template 7. The upper positioning body 1 includes a connecting flange Ⅰ101, a cone barrel Ⅰ103 and a capping 104. The cone barrel Ⅰ103 is a cone barrel with a small top diameter and a large bottom diameter. The connecting flange Ⅰ101 is fixedly connected to the bottom end of the cone barrel Ⅰ103, the capping 104 is fixedly connected to the top of the cone barrel Ⅰ103, the connecting flange Ⅰ101 is fixedly connected to the top surface of the upper template 4, the cone barrel Ⅰ103 and the capping 104 are arranged above the top surface of the upper template 4, the upper sand box 3 is connected to the top surface of the upper template 4, the upper positioning body 1 is connected to the inside of the upper sand box 3, and the cone barrel Ⅰ103 and the capping 104 form a positioning cavity outside the upper sand box 3. 5. The lower positioning body 2 includes a connecting flange II 201, a cone barrel II 203 and a bottom cover 204. The cone barrel II 203 is a cone barrel with a large top diameter and a small bottom diameter. The connecting flange II 201 is fixedly connected to the top surface of the lower template 7. The cone barrel II 203 and the bottom cover 204 are sunk into the lower sand box 6. The lower sand box 6 is connected to the top surface of the lower template 7. The lower sand box 6 forms a convex sand mold 8 inside the cone barrel II 203 and the bottom cover 204. The convex sand mold 8 is inserted into the positioning cavity 5; the top cover 104 is a flat plate; the bottom cover 204 is a flat plate, that is, the top of the positioning cavity 5 formed by the upper positioning body 1 in the upper sand box 3 is a plane, and the top of the convex sand mold 8 formed by the lower positioning body 2 in the lower sand box 6 is a plane; there is a 0.5mm gap between the convex sand mold 8 and the positioning cavity 5.

[0031] A flange groove Ⅰ401 is provided on the top surface of the upper template 4 , and the connecting flange Ⅰ101 is connected in the flange groove Ⅰ401 . The depth of the flange groove Ⅰ401 is the same as the thickness of the connecting flange Ⅰ101 .

[0032] The top surface of the lower template 7 is provided with a flange groove II 701, the bottom surface of the flange groove II 701 is provided with a placement hole 702, the connecting flange II 201 is connected in the flange groove II 701, the depth of the flange groove II 701 is the same as the thickness of the connecting flange II 201, and the cone barrel II 203 and the bottom cover 204 are connected in the placement hole 702.

[0033] The connecting flange Ⅰ101 is provided with a plurality of countersunk holes Ⅰ102, which are evenly distributed around the circumference of the connecting flange Ⅰ101 axis. The bottom surface of the flange groove Ⅰ401 is provided with a plurality of screw holes Ⅰ402, which are coaxial with the plurality of countersunk holes Ⅰ102 one by one. Each screw hole Ⅰ402 is connected to each countersunk hole Ⅰ102 by a countersunk screw, and the head of the countersunk screw is sunk into the countersunk hole Ⅰ102.

[0034] The connecting flange II201 is provided with a plurality of countersunk holes II202, which are evenly distributed around the circumference of the connecting flange II201 axis. The bottom surface of the flange groove II701 is provided with a plurality of screw holes II703, which are coaxial with the plurality of countersunk holes II202 one by one. Each screw hole II703 is connected to each countersunk hole II202 by a countersunk screw, and the head of the countersunk screw is sunk into the countersunk hole II202.

[0035] When the utility model is used, the upper sand box 3 and the positioning cavity 5 are first made by the upper positioning body 1 and the upper template 4. The outer wall of the upper positioning body 1, that is, the contact surface between the upper positioning body 1 and the upper sand box 3, is coated with a mold release agent to ensure that the upper sand box 3 is demolded smoothly. Then, the lower sand box 6 and the convex sand mold 8 are made by the lower positioning body 2 and the lower template 7. The outer wall of the lower positioning body 2, that is, the contact surface between the lower positioning body 2 and the lower sand box 6, is coated with a mold release agent to ensure that the lower sand box 6 is demolded smoothly. After the positioning cavity 5 and the convex sand mold 8 are formed, the upper positioning body 1 and the lower positioning body can be placed on the upper positioning body 1. 2 is removed. When the upper sand box 3 and the lower sand box 6 are combined, the upper positioning body 1 and the lower positioning body 2 are not connected to the upper sand box 3 and the lower sand box 6, but the convex sand mold 8 is directly inserted into the positioning cavity 5. There is a 0.5mm gap between the convex sand mold 8 and the positioning cavity 5 to ensure the smooth connection between the convex sand mold 8 and the positioning cavity 5, which not only ensures the accurate connection positioning but also prevents the convex sand mold 8 and the positioning cavity 5 from interfering. The removed upper positioning body 1 and the lower positioning body 2 can be used for other sand boxes, which is beneficial to improve the work efficiency when multiple sand boxes are produced at the same time.

[0036] The depth of flange groove Ⅰ401 is the same as the thickness of connecting flange Ⅰ101, and countersunk screws are used to ensure that connecting flange Ⅰ101 is flush with the top surface of the upper template 4, thereby ensuring the structural integrity of the positioning cavity 5; the depth of flange groove Ⅱ701 is the same as the thickness of connecting flange Ⅱ201, and countersunk screws are used to ensure that connecting flange Ⅱ201 is flush with the top surface of the lower template 7, thereby ensuring the structural integrity of the raised sand mold 8.

[0037] In actual use, the upper positioning body 1 and the lower positioning body 2 can be formed by 3D printing using PLA material. Generally, three pairs of upper positioning bodies 1 and lower positioning bodies 2 are arranged on a sand box to meet the needs of use.

[0038] The utility model does not need to use unexpected parts of the sand box such as positioning pins when the upper sand box 3 and the lower sand box 6 are combined. There is no risk of the raised sand mold 8 and the positioning cavity 5 falling or being lost during use, which meets the positioning requirements for the combination of self-hardening sand castings and ensures smooth work. The upper positioning body 1 and the lower positioning body 2 can be continuously used for the production of sand boxes, effectively improving work efficiency.

[0039] Embodiment 2:

[0040] like Figure 8-Figure 12As shown, the difference between the second embodiment of the utility model of a casting self-hardening sand box assembly positioning device and the first embodiment is that the capping 104 described in the second embodiment is hemispherical; the bottom sealing 204 is hemispherical; the top of the positioning cavity 5 formed by the upper positioning body 1 in the upper sand box 3 is a spherical top, and the top of the convex sand mold 8 formed by the lower positioning body 2 in the lower sand box 6 is a spherical top; accordingly, the placement hole 702 is also a shape that matches the cone barrel II 203 and the hemispherical bottom sealing 204. In the second embodiment, the positioning cavity 5 and the convex sand mold 8 are connected in a spherical manner to make the connection smooth, eliminating the acute angle or obtuse angle between the positioning cavity 5 and the convex sand mold 8, and instead adopting a smoother curved surface connection, so that the sand box assembly is smoother, and the collision damage when the positioning cavity 5 and the convex sand mold 8 are reconnected is avoided, thereby improving the reuse rate of the sand box.

Claims

1. A self-hardening sand casting box positioning device, characterized in that: The invention comprises an upper positioning body (1), a lower positioning body (2), an upper sand box (3), an upper template (4), a lower sand box (6) and a lower template (7); the upper positioning body (1) comprises a connecting flange I (101), a cone barrel I (103) and a capping (104); the cone barrel I (103) is a cone barrel with a small top diameter and a large bottom diameter; the connecting flange I (101) is fixedly connected to the bottom end of the cone barrel I (103); the capping (104) is fixedly connected to the top end of the cone barrel I (103); the connecting flange I (101) is fixedly connected to the top surface of the upper template (4); the cone barrel I (103) and the capping (104) are arranged above the top surface of the upper template (4); the upper sand box (3) is connected to the top surface of the upper template (4); the upper positioning body (1) comprises a connecting flange I (101), a cone barrel I (103) and a capping (104); the cone barrel I (103) and the capping (104) are fixedly connected to the top surface of the cone barrel I (103); 1) is connected to the interior of an upper sand box (3), a cone barrel I (103) and a top cover (104) form a positioning cavity (5) outside the upper sand box (3), a lower positioning body (2) comprises a connecting flange II (201), a cone barrel II (203) and a bottom cover (204), the cone barrel II (203) is a cone barrel with a large top diameter and a small bottom diameter, the connecting flange II (201) is fixedly connected to the top surface of a lower template (7), the cone barrel II (203) and the bottom cover (204) are sunk into the interior of a lower sand box (6), the lower sand box (6) is connected to the top surface of the lower template (7), the lower sand box (6) forms a convex sand mold (8) inside the cone barrel II (203) and the bottom cover (204), and the convex sand mold (8) is inserted into the positioning cavity (5).

2. A self-hardening sand casting box positioning device according to claim 1, characterized in that: A flange groove I (401) is provided on the top surface of the upper template (4), and the connecting flange I (101) is connected in the flange groove I (401), and the depth of the flange groove I (401) is the same as the thickness of the connecting flange I (101).

3. A self-hardening sand casting box positioning device according to claim 2, characterized in that: The top surface of the lower template (7) is provided with a flange groove II (701), the bottom surface of the flange groove II (701) is provided with a placement hole (702), the connecting flange II (201) is connected in the flange groove II (701), the depth of the flange groove II (701) is the same as the thickness of the connecting flange II (201), and the cone barrel II (203) and the bottom cover (204) are connected in the placement hole (702).

4. A self-hardening sand casting box positioning device according to claim 3, characterized in that: The connecting flange I (101) is provided with a plurality of countersunk holes I (102), and the plurality of countersunk holes I (102) are evenly distributed on a circle with the axis of the connecting flange I (101) as the center. The bottom surface of the flange groove I (401) is provided with a plurality of screw holes I (402), and the plurality of screw holes I (402) are coaxial with the plurality of countersunk holes I (102) one by one. Each screw hole I (402) is connected to each countersunk hole I (102) by a countersunk screw, and the head of the countersunk screw is sunk into the countersunk hole I (102).

5. A self-hardening sand casting box positioning device according to claim 4, characterized in that: The connecting flange II (201) is provided with a plurality of countersunk holes II (202), and the plurality of countersunk holes II (202) are evenly distributed on a circle with the axis of the connecting flange II (201) as the center. The bottom surface of the flange groove II (701) is provided with a plurality of screw holes II (703), and the plurality of screw holes II (703) are coaxial with the plurality of countersunk holes II (202) one by one. Each screw hole II (703) is connected to each countersunk hole II (202) by a countersunk screw, and the head of the countersunk screw is sunk into the countersunk hole II (202).

6. A self-hardening sand casting box positioning device according to claim 5, characterized in that: The top cover (104) is a flat plate; the bottom cover (204) is a flat plate.

7. A self-hardening sand casting box positioning device according to claim 5, characterized in that: The top cover (104) is hemispherical; the bottom cover (204) is hemispherical.

8. A self-hardening sand casting box positioning device according to any one of claims 6 or 7, characterized in that: There is a gap of 0.5 mm between the raised sand mold (8) and the positioning cavity (5).

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