Sand mold casting mold assembling positioning device

Abstract

The utility model discloses a sand mould casting mould assembling positioning device which comprises an upper box cone arranged in an upper box sand mould, a lower box cone arranged in a lower box sand mould and a guide positioning pin, and the upper box cone corresponds to the lower box cone in position when the upper box sand mould and the lower box sand mould are assembled. And the guide positioning pin is downwards inserted into the upper box sand mold from the top of the upper box sand mold, penetrates through the upper box cone and then is guided into the lower box cone. According to the positioning device, the positioning stability of sand mold casting mold closing can be improved, the defects of sand extrusion and dislocation can be prevented, and the positioning precision during mold closing is ensured.

Description

Technical Field

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

[0002] In the resin sand manual molding casting production process, the traditional box closing positioning structure is to use a metal box cone or a sand box cone. Usually, a box cone seat is fixed on the model bottom plate. When the upper and lower boxes are molded by filling sand, a box cone nest is formed in the upper and lower box sand molds. When closing the boxes, a metal box cone or a sand box cone is placed in the box cone nest of the lower box sand mold, and the box cone nest of the upper box sand mold is inserted into the lower box cone. The positioning of the upper and lower box sand molds is completed through the cooperation of the box cone nest and the box cone.

[0003] During the closing process, the positioning device for the upper and lower sand molds is prone to friction, collision and extrusion between the box cone and the box cone nest, which increases the gap between the box cone and the box cone nest. The box cone shakes during closing and the positioning accuracy is poor, which often causes the upper and lower boxes to be misaligned. Moreover, since the metal box cone is easily bumped and deformed after repeated use, a new box cone needs to be made again, resulting in a waste of cost, insufficient strength of the sand box cone, easy damage during the closing process, and poor practicality. Utility Model Content

[0004] The utility model provides a sand casting box closing positioning device to solve the problems of inaccurate positioning and easy misalignment of upper and lower boxes when the prior art sand casting box closing device adopts box cone nests and box cones to realize box closing.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A sand casting box assembly positioning device, characterized in that it comprises an upper box cone arranged in the upper box sand mold, a lower box cone arranged in the lower box sand mold, and a guide positioning pin; each of the upper box cone and the lower box cone has a vertical center through hole in the center, wherein one end of the upper box cone is located on the bottom surface of the upper box sand mold, and one end of the lower box cone is located on the top surface of the lower box sand mold; when the upper box sand mold and the lower box sand mold are assembled, the upper box cone and the lower box cone are positioned correspondingly, and the guide positioning pin is inserted downward from the top of the upper box sand mold into the upper box sand mold and passes through the upper box cone and is introduced into the lower box cone.

[0007] Furthermore, the guide positioning pins are respectively matched with the upper box cone and the lower box cone in clearance.

[0008] Furthermore, the matching clearance between the guide positioning pin and the upper box cone and the matching clearance between the guide positioning pin and the lower box cone are both ±0.1mm.

[0009] Furthermore, the lower end of the guide positioning pin is a frustum, and the center angle of the frustum is 5-10°.

[0010] Furthermore, the upper box cone, the lower box cone, and the guide positioning pins are all cast iron or steel castings.

[0011] The utility model provides a sand casting box closing positioning device. When the upper and lower box sand molds are formed, box cones are respectively arranged in the upper and lower boxes. When the boxes are closed, positioning is achieved by penetrating the box cones with guide positioning pins. The guide positioning pins and the box cones are clearance-matched and are both made of cast iron or cast steel molding materials. Therefore, accurate positioning can be achieved through the precise matching of the guide positioning pins and the box cones, and the problem of misalignment of the upper and lower boxes can be solved. Moreover, the box cones and the guide positioning pins can be taken out and reused, and the production cost is low.

[0012] To sum up, the utility model can improve the stability of the positioning of the sand mold casting box. It not only has a simple structure and is easy to operate, but also can prevent sand squeezing and dislocation defects, thereby ensuring the positioning accuracy during the box closing. This positioning device can not only meet the casting production and improve the quality of castings, but also improve production efficiency and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a positioning device according to an embodiment of the utility model.

[0014] Figure 2 It is a schematic diagram of the upper box sand mold modeling in the embodiment of the utility model.

[0015] Figure 3 It is a schematic diagram of the lower box sand mold modeling in the embodiment of the utility model. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0017] like Figure 1 As shown, this embodiment discloses a sand casting box assembly positioning device, comprising an upper box sand mold 1 with an upper box cone 3 left inside, a lower box sand mold 2 with a lower box cone 4 left inside, and guide positioning pins 5. The number of upper box cones 3 in the upper box sand mold 1 is one or more, and the number of lower box sand molds 2 and the number of guide positioning pins 5 are the same as the number of upper box cones 3.

[0018] Each upper box cone 3 and lower box cone 4 has a vertical central through hole in the center, so that the upper and lower ends of each upper box cone 3 and lower box cone 4 are both openings, and the central through hole diameters of the upper box cone 3 and lower box cone 4 are the same. The lower end of the guide positioning pin 5 is a frustum, and the center angle of the frustum is 5-10°. The frustum guides the guide positioning pin 5 so that the guide positioning pin 5 can be easily inserted into the box cone. In addition, the upper box cone 3, the lower box cone 4, and the guide positioning pin 5 are all cast iron or cast steel parts made of cast iron or cast steel.

[0019] Among them Figure 2 As shown, the molding process of the upper box sand mold 1 is as follows: an upper box template 6 and an upper box cone positioning sleeve 7 made of cast iron or cast steel are used, and the number of upper box cone positioning sleeves 7 is the same as that of the upper box cone 3; according to the position design requirements of the upper box cone 3 in the upper box sand mold 1, each upper box cone positioning sleeve 7 is fixed to the corresponding design position of the upper box template 6 by a number of screws, and the upper end sleeve of the upper box cone positioning sleeve 7 is flush with the top surface of the upper box template 6. Then, the upper box cones 3 are coaxially placed on the upper box cone positioning sleeve 7 one by one. Then, the guide positioning pins 5 are respectively inserted into the upper box cone positioning sleeves 7 and the upper box cone 3 in the corresponding positions, so that the lower end of the guide positioning pins 5 pass downward through the upper box cone 3 and then are introduced into the corresponding upper box cone positioning sleeves 7, and the guide positioning pins 5 and the upper box cone 3 and the upper box cone positioning sleeves 7 are all clearance fits, and the fitting clearances are all ±0.1mm. Then, the upper box sand mold 1 is molded on the upper box template 6. After the molding is completed, the upper box cone 3 remains in the upper box sand mold 1, and the lower end opening of the upper box cone 3 is located on the bottom surface of the upper box sand mold 1. The upper box cone 3 is located at the design required position in the upper box sand mold 1 through the upper box cone positioning sleeve 7. Finally, the guide positioning pin 5 is pulled out upward and the upper box template 6 is removed. Since the guide positioning pin 5 previously occupied a certain space in the upper box sand mold 1, after the guide positioning pin 5 is pulled out, a blind hole is reserved inside the upper box sand mold 1 above each upper box cone 3, and the lower end opening of the blind hole is connected to the upper end opening of the corresponding upper box cone 3, and the upper end opening of the blind hole is located on the top surface of the upper box cone 3.

[0020] like Figure 3As shown, the molding process of the lower box sand mold 2 is: using a lower box template 8, a lower box cone positioning sleeve 9 made of cast iron or cast steel, and a positioning pin 10 whose outer diameter is consistent with the outer diameter of the guide positioning pin 5, and the positioning pin 10 is also made of cast iron or cast steel. The number of lower box cone positioning sleeves 9 is the same as the number of lower box cones 4. According to the design requirements, the position of the lower box cone 4 in the lower box sand mold 2 needs to correspond to the position of the upper box cone 3 in the upper box sand mold 1. Therefore, according to this design requirement, each lower box cone positioning sleeve 9 is fixed to the corresponding design position of the lower box template 8 by a number of screws, and the upper end sleeve of the lower box cone positioning sleeve 9 is flush with the top surface of the lower box template 8. Then, the lower part of the positioning pin 10 is inserted into the lower box cone positioning sleeve 9 one by one, so that the upper part of the positioning pin 10 is exposed from the corresponding upper end sleeve of the lower box cone positioning sleeve 9, and then the lower box cone 4 is sleeved on the upper part of the positioning pin 10 one by one. The positioning pin 10 and the lower box cone 4 and the lower box cone positioning sleeve 9 are all clearance fits, and the fitting clearance is ±0.1mm. Then, the lower box sand mold 2 is molded on the lower box template 8. After the molding is completed, the lower box cone 4 remains in the lower box sand mold 2, and at this time, the lower end opening of the lower box cone 4 is located on the bottom surface of the lower box sand mold 2, and the lower box cone is located at the design required position in the lower box sand mold 2 through the lower box cone positioning sleeve 9. Finally, remove the lower box template 8, pull out the positioning pin 10 downward, and then turn the lower box sand mold 2 upside down 180 degrees, so that the top and bottom surfaces of the lower box sand mold 2 are turned upside down, and the upper and lower end openings of the lower box cone 4 are turned upside down. After the inversion, the original lower end opening of the lower box cone 4 becomes the upper end opening and is located on the top surface of the lower box sand mold 2.

[0021] like Figure 1 As shown, when the upper and lower box sand molds are assembled, the lower box sand mold 2, which is previously inverted 180 degrees, is placed below the upper box sand mold 1, so that the upper box sand mold 1 is assembled on the lower box sand mold 2. Since the position of the upper box cone 3 in the upper box sand mold 1 corresponds to the position of the lower box cone 4 in the lower box sand mold 2, when the bottom surface of the upper box sand mold 1 is fitted with the top surface of the lower box sand mold 2, the lower end openings of the upper box cone 3 in the upper box sand mold 1 correspond to the upper end openings of the lower box cone 4 in the lower box sand mold 2. Then, by hanging with a crane, guide positioning pins 5 are respectively inserted into the upper box cone 3 and the lower box cone 4 at the corresponding positions. When inserted, the guide positioning pins 5 penetrate the upper box sand mold 1 from the blind hole of the upper box sand mold 1, and then pass through the upper box cone 3 in the upper box sand mold 1 and then are introduced into the lower box cone 4 in the lower box sand mold 2, and the upper part of the guide positioning pins 5 extends a certain length from the top of the upper box sand mold 1 to facilitate the observation of the assembly. Precise positioning is achieved by the cooperation of the guide positioning pin 1, the upper box cone 3, and the lower box cone 4, and the clearance between the guide positioning pin 1 and the upper box cone 3 and the lower box cone 4 is ±0.1mm.

[0022] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. The embodiments described in the present invention are merely descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. The various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. Such combinations should also be regarded as the contents disclosed in the present disclosure as long as they do not violate the concept of the present invention. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0023] The present invention is not limited to the specific details in the above-mentioned embodiments. Within the technical concept of the present invention and without departing from the design concept of the present invention, various modifications and improvements made to the technical solution of the present invention by technical personnel in this field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have been fully recorded in the claims.

Claims

1. A sand casting box positioning device, characterized in that: It includes an upper box cone arranged in the upper box sand mold, a lower box cone arranged in the lower box sand mold, and a guide positioning pin; each of the upper box cone and the lower box cone has a vertical center through hole in the center, wherein one end of the upper box cone is located at the bottom surface of the upper box sand mold, and one end of the lower box cone is located at the top surface of the lower box sand mold; when the upper box sand mold and the lower box sand mold are combined, the positions of the upper box cone and the lower box cone correspond, and the guide positioning pin is inserted from the top of the upper box sand mold downward into the upper box sand mold and passes through the upper box cone and then is introduced into the lower box cone.

2. A sand casting box assembly positioning device according to claim 1, characterized in that: The guide positioning pins are respectively matched with the upper box cone and the lower box cone in clearance.

3. A sand casting box assembly positioning device according to claim 2, characterized in that: The matching clearance between the guide positioning pin and the upper box cone and the matching clearance between the guide positioning pin and the lower box cone are both ±0.1mm.

4. A sand casting box assembly positioning device according to claim 1, characterized in that: The lower end of the guide positioning pin is a frustum of a cone, and the center angle of the frustum of a cone is 5-10°.

5. The sand casting assembly positioning device according to claim 1, characterized in that: The upper box cone, the lower box cone and the guide positioning pins are all cast iron or steel castings.

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