CN114918378A

CN114918378A - Positioning process for core head of sand core

Info

Publication number: CN114918378A
Application number: CN202210633588.9A
Authority: CN
Inventors: 李光民; 董兴; 李兆霞; 张会杰; 许文青; 孔庆柱; 吕海峰
Original assignee: SHANDONG HUIJIN CO Ltd
Current assignee: SHANDONG HUIJIN CO Ltd
Priority date: 2022-06-07
Filing date: 2022-06-07
Publication date: 2022-08-19

Abstract

The invention discloses a positioning process of a core print of a sand core, which relates to the technical field of positioning of the core print of the sand core and comprises an upper sand mold, a lower sand mold, a sand core and a cavity, wherein the upper sand mold and the lower sand mold can be matched, the cavity is formed between the upper sand mold and the lower sand mold, the sand core is arranged in the cavity, the upper sand mold consists of an upper core print axial positioning surface and an upper core print radial positioning surface, the upper core print radial positioning surface is positioned below the upper core print axial positioning surface, and the lower sand mold consists of a lower core print radial positioning surface, a lower core print axial positioning surface and a lower sand collecting groove. The positioning process of the core head of the sand core has the advantages that the structural design is reasonable, the use is convenient, the weight of the sand core is greatly reduced on the premise of not influencing the operation production and the positioning precision, the cost of the molding sand is far lower than that of the core sand, and the core manufacturing production cost is reduced; because the weight of the sand core is reduced, the gas evolution of the core making binder after pouring is reduced, the defect of casting pores is reduced, and the product quality is improved.

Description

Positioning process for core head of sand core

Technical Field

The invention relates to the technical field of positioning of sand core heads, in particular to a sand core head positioning process.

Background

In the existing sand core head positioning process, the positioning precision of the sand core head is low, the weight of the sand core is large, the production cost of the core making production cost is increased, and the gas evolution of the core making binder can be increased after pouring due to the fact that the weight of the sand core is reduced, so that the defect of casting gas holes is increased, and the product quality is reduced.

Disclosure of Invention

The invention aims to provide a positioning process of a core head of a sand core, which aims to solve the defects of the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: the upper sand mold and the lower sand mold can be matched, the cavity is formed between the upper sand mold and the lower sand mold, a sand core is arranged in the cavity, the upper sand mold comprises an upper core axial positioning surface and an upper core radial positioning surface, the upper core radial positioning surface is positioned below the upper core axial positioning surface, the lower sand mold comprises a lower core radial positioning surface, a lower core axial positioning surface and a lower sand collecting groove, and the lower core axial positioning surface is positioned between the lower core radial positioning surface and the lower sand collecting groove.

According to the positioning process of the core head of the sand core, the sand core is provided with the sand-assembling type sand collecting groove.

According to the positioning process of the core print of the sand core, the core print is arranged on the sand core and is divided into an upper core print and a lower core print, the upper core print is positioned in a concave casting mould cavity, and the upper core print is positioned in a mould-closing invisible mode.

According to the positioning process of the core head of the sand core, the height of the core head protruding out of the inner cavity of the casting is 2-3 mm.

The invention has the advantages that: the positioning process of the core head of the sand core has the advantages that the structural design is reasonable, the use is convenient, the weight of the sand core is greatly reduced on the premise of not influencing the operation production and the positioning precision, the cost of the molding sand is far lower than that of the core sand, and the core manufacturing production cost is reduced; because the weight of the sand core is reduced, the gas evolution of the core making binder after pouring is reduced, the defect of casting pores is reduced, and the product quality is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.

FIG. 1 is a schematic diagram of a prior art structure; fig. 2 is a schematic view of the overall structure of the present invention.

Reference numerals are as follows: 1-upper sand mould, 2-lower sand mould, 3-sand core, 4-cavity, 5-mould-combination sand collecting groove, 6-upper core axial positioning surface, 7-upper core radial positioning surface, 8-lower core radial positioning surface, 9-lower core axial positioning surface and 10-lower sand collecting groove.

Detailed Description

As shown in fig. 1 to 2, the positioning process for the core of the sand core specifically disclosed in this embodiment includes an upper sand mold 1, a lower sand mold 2, a sand core 3 and a cavity 4, where the upper sand mold 1 and the lower sand mold 2 can be matched, the cavity 4 is formed between the upper sand mold 1 and the lower sand mold 2, the sand core 3 is disposed in the cavity 4, the upper sand mold 1 is composed of an upper core axial positioning surface 6 and an upper core radial positioning surface 7, the upper core radial positioning surface 7 is located below the upper core axial positioning surface 6, the lower sand mold 2 is composed of a lower core radial positioning surface 8, a lower core axial positioning surface 9 and a lower sand collecting groove 10, and the lower core axial positioning surface 9 is located between the lower core radial positioning surface 8 and the lower sand collecting groove 10. The positioning process of the core head of the sand core has the advantages that the structural design is reasonable, the use is convenient, the weight of the sand core is greatly reduced on the premise of not influencing the operation production and the positioning precision, the cost of the molding sand is far lower than that of the core sand, and the core manufacturing production cost is reduced; because the weight of the sand core is reduced, the gas evolution of the core-making binder after casting is reduced, the pore defect of the casting is reduced, and the product quality is improved. In order to ensure that the size of the cavity meets the requirement, the position degree of the sand core 3 in the sand mold is finished by the positioning precision of a core head, and an upper core head axial positioning surface 6 is used for limiting the sand core 3 from moving upwards or floating; the sand-collecting groove 5 can prevent the sand cushion which is not extruded due to the placement of the sand core 3 from influencing the positioning precision between the upper sand mold 1 and the upper positioning surface when the sand mold 1 is mounted in the mold assembling box; when the radial positioning surface 7 of the upper core print has the mould assembling taper, the sand core 3 can be freely aligned and the radial displacement of the sand core 3 in the cavity 4 can be prevented; when the radial positioning surface 8 of the lower core head has taper lower core, the sand core 3 can be freely aligned and the radial displacement of the sand core 3 in the cavity 4 can be prevented; the lower sand collecting groove 10 can prevent incorrect placement during core setting, and prevent the positioning precision of the squeezed sand cushion from being influenced between the lower sand mold 2 and the lower positioning surface; the lower core axial positioning surface 9 limits the sand core 3 from moving downwards; as shown in figure 1, a traditional sand core is positioned with a sand mold (cavity), D/B is the size diameter or length and width of a core head, the size of the core head conforms to the contour size of an inner cavity of a casting, and the core head protrudes out of the contour of the inner cavity of the casting, so that the cast casting is convenient to clean flash and burrs; l is the cavity (or casting) height; h1, h is the height of the upper core print and the lower core print, and the size depends on the size of the D/B size and is not described in detail; t is the clearance between the sand core and the sand mold, and is an empirical value, so that the phenomena of incomplete core setting and no interference when the sand mold (box) is closed are prevented; in the positioning process of the core print of the sand core, as shown in FIG. 2, D/B is the size diameter or length and width of the core print, which conforms to the contour size of the inner cavity of the casting, and the height h1(2-3mm) of the core print protruding out of the contour of the inner cavity of the casting is convenient for the cast casting to clear flash and burr; d/b is the contour dimension of the core head of the cavity of the concave casting mold, and the thickness of the sand core is determined according to the wall thickness of the casting; the height L is the height of the cavity (or the casting); h2 is the height of the core print of the cavity of the concave mould, and the dimension depends on the size of the d/b dimension and the stripping precision of the moulding equipment; h3 is a cavity part of the sand core after mould assembling and can be used as a mould assembling sand collecting groove 5; t is the clearance between the sand core and the sand mold, an empirical value, and the condition that the core is not put in place and the sand mold (box) is closed is avoided, so that the weight of the sand core is greatly reduced by the sand core head positioning process on the premise of not influencing operation production and positioning precision, and the core manufacturing production cost is reduced by considering that the price of the molding sand is far lower than that of the core sand; because the weight of the sand core is reduced, the gas evolution of the core making binder after pouring is reduced, the defect of casting pores is reduced, and the product quality is improved.

Specifically, the sand core 3 according to the present embodiment is provided with a sand-collecting type trough 5. When the device is used, the sand-collecting groove 5 is closed to prevent the sand cushion which is not extruded because the sand core 3 is placed when the sand mould 1 is closed from influencing the positioning precision between the upper sand mould 1 and the upper positioning surface.

Specifically, the sand core 3 described in this embodiment is provided with a core print, the core print is divided into an upper core print and a lower core print, the upper core print is positioned in the concave casting cavity 4, and the upper core print is positioned in the mold-closed invisible mode. When the device is used, the upper core print can protrude out of the outer positioning mode of the casting mold cavity 4 for recessing the inner positioning of the casting mold cavity 4.

Further, the height of the core print protruding out of the inner cavity profile of the casting is 2-3 mm. When the device is used, the height of the core head protruding out of the outline of the inner cavity of the casting is 2-3mm, so that the cast casting can be conveniently cleaned of flash and burrs.

The embodiments of the present invention have been described above with reference to the accompanying drawings, but these descriptions should not be construed as limiting the scope of the present invention, and the technical contents not described in detail in the present invention are known in the art.

Claims

1. A positioning process of a core head of a sand core is characterized by comprising the following steps: including last sand mould (1), lower sand mould (2), psammitolite (3) and die cavity (4), go up sand mould (1) and can cooperate with lower sand mould (2), go up sand mould (1) and form die cavity (4) down between sand mould (2), be equipped with psammitolite (3) in die cavity (4), go up sand mould (1) by last core axial locating surface (6), it constitutes to go up core radial locating surface 7, it is located the below of last core axial locating surface (6) to go up core axial locating surface (6), lower sand mould (2) are by lower core radial locating surface (8), lower core axial locating surface (9) and lower sand collecting groove (10) are constituteed, lower core axial locating surface (9) are located between lower core radial locating surface (8) and lower sand collecting groove (10).

2. The sand core head positioning process of claim 1, wherein: the sand core (3) is provided with a combined sand collecting groove (5).

3. The sand core head positioning process of claim 1, wherein: the sand core (3) is provided with a core head which is divided into an upper core head and a lower core head, the upper core head is positioned in the concave casting mould cavity (4), and the upper core head is positioned in the mould-assembling invisible mode.

4. The sand core head positioning process of claim 3, wherein: the height of the core print protruding out of the inner cavity profile of the casting is 2-3 mm.