Die structure for pulling block and movable block of integral sand core of differential shell

Abstract

The utility model relates to the technical field of sand core manufacturing, in particular to a die structure for pulling and adding a movable block to a differential shell integral sand core, which comprises a lower die and an upper die, an insert is fixedly connected to the top of the lower die, a motion space is formed between the lower die and the insert, a containing groove is arranged in the middle of the insert, and a sand core is placed in the containing groove; the upper die is arranged at the top of the lower die, limiting blocks are fixedly connected to the four corners of the bottom of the upper die, and an inclined plate is fixedly connected to one side of each limiting block. When the mold is opened, the upper mold is moved away after being drawn, then the air cylinders on the left side and the right side operate to drive the left pulling block and the right pulling block to move leftwards and rightwards respectively, the positions, making contact with the pulling blocks, of the bottom of the sand core are smoothly demolded, then the lower mold ejects the core, the movable block and the sand core are demolded together, the movable block is demolded manually, and the complete sand core can be obtained. And the sand core can be smoothly opened, mass production can be organized, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sand core manufacturing, in particular to a mold structure of a differential shell integral sand core drawing block and a live block. Background Art

[0002] In the production of castings, sand cores are generally used. Sand cores have the following functions: forming the inner cavity and holes of the casting. For some inner cavities with more complex shapes, sand cores must be used to form them. This is an extremely important function of sand cores; forming the outer shape of the casting. For castings with more complex external shapes, such as many bosses and bumps that hinder demolding and are not easy to remove live blocks, and with complex curved shapes, when the outer mold is difficult to make, sand cores are often used to form the outer shape of the casting; strengthening the strength of the local sand mold. When pouring large and medium-sized castings, the sprue is generally very high, the metal scouring force is very large, and the scouring time for the same place in the sand mold is also long. The sand molds in these places are often washed away due to insufficient strength. Therefore, in order to ensure the quality of castings and prevent defects such as scouring, high-strength sand core blocks are often embedded in places with strong scouring forces.

[0003] like Figure 1 As shown in the figure, the sand core of the new product difference shell is developed, which is used to form the inner cavity of the difference shell during the casting process. The sand mold is subjected to the demolding analysis (the right side is the demolding direction). The sand core has four side concave cavities with reverse demolding phenomenon, and the mold cannot be opened in the normal way. If the demolding direction is changed, such as Figure 2 As shown, there are many places where the mold cannot be removed, especially Figure 2 The shape part in the middle circle cannot be demolded normally. Considering the shape of the entire sand core, demolding in this direction is not a good solution. For this sand core, the conventional demolding method is not convenient for smooth mold opening, which will affect the production of the sand core. In view of this, a mold structure with a differential shell integral sand core extraction block and a live block is designed. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a mold structure for a differential shell integral sand core extraction block and a movable block, which solves the problem that the prior art demoulding method is inconvenient for smooth mold opening and affects the production and manufacturing of the sand core.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a mold structure for a differential shell integral sand core extraction block and a movable block, comprising a lower mold and an upper mold, the top of the lower mold is fixedly connected with an insert, a movement space is formed between the lower mold and the insert, a receiving groove is provided in the middle of the insert, and a sand core is placed inside the receiving groove;

[0006] The upper die is arranged on the top of the lower die, and the four corners of the bottom of the upper die are fixedly connected with limit blocks, and one side of the limit block is fixedly connected with an inclined plate;

[0007] Cylinders are fixedly connected to both sides of the movement space, wedge blocks are fixedly connected to both sides of the rear end of the cylinder, a pumping block is fixedly connected to the output end of the cylinder, and a movable block is connected to the top of the pumping block.

[0008] Preferably, an inclined portion is provided on the inner side of the bottom of the limit block, and the inclined plate is fixedly connected to the inclined portion.

[0009] Preferably, the wedge block is in a trapezoidal shape, the width of the wedge block on the side away from the cylinder increases from top to bottom, and the inclined plate abuts against the side of the wedge block away from the cylinder.

[0010] Preferably, the four sides of the sand core are provided with concave cavities, and the concave cavities are provided with reverse draft mold parts.

[0011] Preferably, the drawer block is detachably connected to the top of the movable block, and a forming portion for forming a concave cavity is provided on the drawer block and the movable block.

[0012] Preferably, a structure for preventing unexpected falling off is embedded on the top of the movable block, and the shape of the structure for preventing unexpected falling off is an oblique triangle.

[0013] Preferably, a lifting piece is fixedly connected to the middle portion of the inner bottom wall of the lower mold, and the bottom of the sand core abuts against the top of the lifting piece.

[0014] Preferably, through slots are provided at the four corners of the top of the insert, and the through slots are used for the limiting blocks to pass through.

[0015] By means of the above technical solution, the utility model provides a mold structure of a differential shell integral sand core block extraction and live block, which has at least the following beneficial effects:

[0016] 1. The mold structure of the integral sand core extraction block and movable block of the differential shell, when opening the mold, first the upper mold is removed after demolding, and then the cylinders on the left and right sides are operated to drive the left and right extraction blocks to move to the left and right respectively, and the position where the bottom of the sand core contacts the extraction block is smoothly demolded, and then the lower mold pushes the core, and the movable block is demolded together with the sand core. The movable block is manually demolded to obtain a complete sand core, which can ensure the smooth opening of the sand core and organize mass production, thereby improving work efficiency.

[0017] 2. The mold structure of the integral sand core extraction block and movable block of the differential shell is that when making the core, the upper mold is closed onto the lower mold. When the mold is closed in place, the limit block on the upper mold extends into the movement space, and the inclined plate is pressed just on the wedge block at the tail of the cylinder. This mechanical structure prevents the cylinder and the extraction block from retreating due to the sand blowing pressure transmitted from the cavity during sand shooting. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application:

[0019] Figure 1 This is a state diagram of the first demolding direction of the sand core of the utility model;

[0020] Figure 2 This is a state diagram of the sand core of the utility model in the second demolding direction;

[0021] Figure 3 It is a schematic diagram of the structure of the utility model;

[0022] Figure 4 It is a schematic diagram of the upper mold, insert block, sand core and limit block structure of the utility model;

[0023] Figure 5 This is a schematic diagram of the insert structure of the utility model;

[0024] Figure 6 This is a schematic diagram of the lower mold, sand core, limit block and cylinder structure of the utility model;

[0025] Figure 7 This is a schematic diagram of the structure of the limit block and the inclined plate of the utility model;

[0026] Figure 8 It is a schematic diagram of the structure of the cylinder, wedge block, pumping block and movable block of the utility model;

[0027] Fig. 9 This is a top view of the lower mold and jacking member structure of the utility model.

[0028] In the figure: 1. lower die; 2. upper die; 3. insert; 4. movement space; 5. accommodating groove; 6. sand core; 7. limit block; 8. inclined plate; 9. cylinder; 10. wedge block; 11. withdrawal block; 12. movable block; 13. structure to prevent unexpected falling off; 14. lifting piece. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] See also Figure 3 , Figure 4 and Figure 5 A mold structure for a differential shell integral sand core extraction block and a movable block comprises a lower mold 1 and an upper mold 2, the top of the lower mold 1 is fixedly connected with an insert 3, a movement space 4 is formed between the lower mold 1 and the insert 3, a receiving groove 5 is provided in the middle of the insert 3, and a sand core 6 is placed inside the receiving groove 5.

[0031] like Figure 3 and Figure 6 As shown, the upper mold 2 is arranged on the top of the lower mold 1, and the four corners of the bottom of the upper mold 2 are fixedly connected with the limit blocks 7, and one side of the limit block 7 is fixedly connected with the inclined plate 8; the four corners of the top of the insert 3 are provided with through grooves, and the through grooves are used for the limit blocks 7 to pass through.

[0032] like Figure 4 , Figure 6 and Figure 8 As shown, cylinders 9 are fixedly connected to both sides of the movement space 4, wedge blocks 10 are fixedly connected to both sides of the tail end of the cylinder 9, a pumping block 11 is fixedly connected to the output end of the cylinder 9, and a movable block 12 is connected to the top of the pumping block 11. When opening the mold, the upper mold 2 is first removed after the mold is opened, and then the cylinders 9 on the left and right sides are operated to drive the left and right pumping blocks 11 to move to the left and right respectively, and the position where the bottom of the sand core 6 contacts the pumping block 11 is smoothly demolded, and then the lower mold 1 is pushed up, and the movable block 12 is demolded together with the sand core 6. The movable block 12 is manually demolded to obtain a complete sand core 6, which can ensure the smooth opening of the sand core 6 and organize mass production, thereby improving work efficiency.

[0033] like Figure 6 and Figure 7 As shown, the inner side of the bottom of the limit block 7 is provided with an inclined portion, and the inclined plate 8 is fixedly connected to the inclined portion. The wedge block 10 is in the shape of a trapezoid, and the width of the side of the wedge block 10 away from the cylinder 9 increases from top to bottom, and the inclined plate 8 abuts against the side of the wedge block 10 away from the cylinder 9. When making the core, the upper mold 2 is closed onto the lower mold 1. When the mold is closed in place, the limit block 7 on the upper mold 2 extends into the movement space 4, and the inclined plate 8 just presses on the wedge block 10 at the tail of the cylinder 9. This mechanical structure prevents the cylinder 9 and the extraction block 11 from retreating due to the sand blowing pressure transmitted from the cavity during sand shooting.

[0034] like Figure 1 and Figure 2 As shown, the four sides of the sand core 6 are provided with concave cavities, and the concave cavities are provided with reverse drafting parts. The drawing block 11 is detachably connected to the top of the movable block 12, and the drawing block 11 and the movable block 12 are provided with molding parts for forming the concave cavities.

[0035] like Figure 8 As shown, an anti-unexpected falling structure 13 is embedded on the top of the movable block 12, and the shape of the anti-unexpected falling structure 13 is an oblique triangle. When making the core, the anti-unexpected falling structure 13 can make the movable block 12 hook on the sand core 6, and the movable block 12 will not fall from the sand core 6 without external force; and after the mold is opened, the movable block 12 can be manually removed from the sand core 6, which facilitates the smooth mold opening of the sand core 6.

[0036] like Fig. 9As shown, a lifting piece 14 is fixedly connected to the middle of the inner bottom wall of the lower mold 1, and the bottom of the sand core 6 abuts against the top of the lifting piece 14. When the mold is opened, the lifting piece 14 can lift the sand core 6 upward, and the movable block 12 will move upward with the sand core 6 to facilitate demolding of the sand core 6.

[0037] Working principle: When making cores, the upper mold 2 is closed to the top of the lower mold 1. When the mold is closed in place, the limit block 7 on the upper mold 2 extends into the movement space 4, and the inclined plate 8 is pressed on the wedge block 10 at the tail of the cylinder 9;

[0038] The operation of the cylinder 9 drives the pumping block 11 and the movable block 12 to move, and the concave cavities on the four sides of the sand core 6 are formed by the pumping block 11 and the movable block 12;

[0039] When opening the mold, first the upper mold 2 is removed after demolding, and then the left and right cylinders 9 are operated to drive the left and right withdrawal blocks 11 to move left and right respectively. The position where the bottom of the sand core 6 contacts the withdrawal block 11 is demolded smoothly. Then, the lifting piece 14 can lift the sand core 6 upward, and the anti-unexpected falling structure 13 can make the movable block 12 hook on the sand core 6, and the movable block 12 will move upward with the sand core 6. The movable block 12 can be demolded manually to obtain a complete sand core 6, ensuring that the sand core 6 can be smoothly opened and mass production can be organized.

[0040] It should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mold structure for a differential shell integral sand core block extraction and live block, comprising a lower mold (1) and an upper mold (2), characterized in that: The top of the lower mold (1) is fixedly connected with an insert (3), a movement space (4) is formed between the lower mold (1) and the insert (3), a receiving groove (5) is provided in the middle of the insert (3), and a sand core (6) is placed inside the receiving groove (5); The upper mold (2) is arranged on the top of the lower mold (1), and the four corners of the bottom of the upper mold (2) are fixedly connected to limit blocks (7), and one side of the limit block (7) is fixedly connected to an inclined plate (8); The inside of the movement space (4) is fixedly connected to a cylinder (9) on both sides, the rear end of the cylinder (9) is fixedly connected to a wedge block (10) on both sides, the output end of the cylinder (9) is fixedly connected to a pumping block (11), and the top of the pumping block (11) is connected to a movable block (12).

2. The mold structure of the differential shell integral sand core extraction block and active block according to claim 1 is characterized in that: An inclined portion is provided on the inner side of the bottom of the limit block (7), and the inclined plate (8) is fixedly connected to the inclined portion.

3. The mold structure of the differential shell integral sand core extraction block and live block according to claim 2 is characterized in that: The wedge block (10) is in a trapezoidal shape, and the width of the side of the wedge block (10) away from the cylinder (9) increases from top to bottom, and the inclined plate (8) abuts against the side of the wedge block (10) away from the cylinder (9).

4. The mold structure of the differential shell integral sand core extraction block and live block according to claim 1 is characterized in that: The four sides of the sand core (6) are all provided with concave cavities, and the concave cavities are provided with reverse drafting parts.

5. The mold structure of the differential shell integral sand core extraction block and live block according to claim 4 is characterized in that: The draw block (11) is detachably connected to the top of the movable block (12), and a forming portion for forming a concave cavity is provided on the draw block (11) and the movable block (12).

6. The mold structure of the differential shell integral sand core extraction block and active block according to claim 1 is characterized in that: An anti-unexpected falling-off structure (13) is embedded on the top of the movable block (12), and the anti-unexpected falling-off structure (13) is in the shape of an oblique triangle.

7. The mold structure of the differential shell integral sand core extraction block and active block according to claim 1 is characterized in that: A lifting piece (14) is fixedly connected to the middle of the inner bottom wall of the lower mold (1), and the bottom of the sand core (6) abuts against the top of the lifting piece (14).

8. The mold structure of the differential shell integral sand core extraction block and active block according to claim 1 is characterized in that: Through slots are provided at the four corners of the top of the insert (3), and the through slots are used for the limiting block (7) to pass through.

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