A process for automatically eliminating shrinkage in valve body castings

Abstract

The invention discloses a process method for automatically eliminating shrinkage in a valve body casting in the field of valve body casting processing technology. The process method comprises a casting mold cavity of the valve body casting, wherein a main flow gate is arranged at the middle position of the top of the casting mold cavity of the valve body casting, and auxiliary flow gates are arranged on the front and rear sides of the top of the casting mold cavity of the valve body casting. Riser is arranged on the outer walls of the main flow gate and the auxiliary flow gate, and the main flow gate and the auxiliary flow gate, as well as the two connected groups of auxiliary flow gates, are connected through a through groove, and heat dissipation copper plates are arranged on the left and right sides of the top of the casting mold cavity of the valve body casting, and heat dissipation holes are evenly arranged on the top of the heat dissipation copper plates to ensure effective control of the temperature, increase the molding speed, improve the efficiency, and ensure that the surface of the molded product is smoother and will not be deformed. At the same time, the riser is arranged to achieve the effect of rapid condensation and shrinkage compensation, optimize the material structure of the casting, reduce the shrinkage phenomenon, and improve the density of the casting and reduce the tendency of the casting to form shrinkage when the casting is formed.

Description

Technical Field

[0001] The invention relates to the technical field of valve body casting processing technology, in particular to a process method for automatically eliminating the shrinkage phenomenon in valve body casting. Background Art

[0002] Shrinkage is a serious defect of castings. Castings are often scrapped due to shrinkage defects. Taking valve body castings as an example, in the existing technology, the main core hole inside the valve body is prone to shrinkage during the processing and production of valve body castings. The main reason for this is that the mud core inside the valve body is currently poorly stable and easy to bend; the casting only relies on sequential solidification to achieve shrinkage compensation during molding, and the effect is not very significant; only relying on the mainstream gate casting makes the liquid raw material flow slowly, and the molding speed and temperature are difficult to control. To this end, we propose a process method for automatically eliminating shrinkage in valve body castings. Summary of the invention

[0003] The object of the present invention is to provide a process for automatically eliminating the shrinkage phenomenon in a valve body casting, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a process method for automatically eliminating the shrinkage phenomenon in a valve body casting, comprising a casting mold cavity of a valve body casting, a main flow gate is arranged at the middle position of the top of the casting mold cavity of the valve body casting, and auxiliary flow gates are arranged on both the front and rear sides of the top of the casting mold cavity of the valve body casting, and the auxiliary flow gates are arranged on the front and rear sides of the main flow gate, and the outer walls of the main flow gate and the auxiliary flow gate are both provided with risers, the main flow gate and the auxiliary flow gate, and the two connected groups of auxiliary flow gates are connected by through grooves, and heat dissipation copper plates are arranged on the left and right sides of the top of the casting mold cavity of the valve body casting, and the heat dissipation copper plates are arranged on the left and right sides of the top of the casting mold cavity of the valve body casting. Heat dissipation holes are evenly arranged on the top of the hot copper plate, sand shooting holes are arranged on the left and right outer walls of the casting mold cavity of the valve body casting, a vibration device is arranged at the bottom of the casting mold cavity of the valve body casting, sand cores are arranged on the left and right sides of the inner cavity of the casting mold cavity of the valve body casting, and branch channels are arranged on the left and right outer walls of the main flow gate and the secondary flow gate, the other end of the branch channel is connected to the sand core, and reinforcing ribs are arranged on the outer walls of the sand core, core plates are arranged on the left and right inner walls of the casting mold cavity of the valve body casting, and the other end of the core plate is connected to the core block, the other end of the core block is connected to the outer wall of the sand core, and the core block is arranged below the reinforcing rib.

[0005] Furthermore, the vibration device includes a supporting base movably arranged at the bottom of the casting mold cavity of the valve body casting, a driving motor is arranged on the inner wall of the inner cavity of the supporting base, the output end of the driving motor is connected to the rotating shaft, four groups of limiting sleeves are evenly arranged on the top of the supporting base, and the end surface of the limiting sleeve close to the outer wall of the casting mold cavity of the valve body casting is attached to the outer wall of the casting mold cavity of the valve body casting, the inner cavity of the limiting sleeve is movably inserted with a movable shaft, the movable shaft and the outer wall of the rotating shaft close to the bottom are both connected with a rotating wheel, and the outer walls of two adjacent groups of the rotating wheels are connected to the conveyor belt.

[0006] Furthermore, an outer ring is fixedly provided on the outer wall of the movable shaft near the top, a semicircular protrusion is provided on the outer wall of the outer ring, and the semicircular protrusion is movably connected to the inner walls of the front and rear sides of the limiting sleeve.

[0007] Furthermore, a main flow gate and four secondary flow gates are arranged on the top of the casting mold cavity of the valve body casting, and the aperture of the main flow gate is larger than the aperture of the secondary flow gate.

[0008] Furthermore, there are ten sand cores in total, and the sand cores are symmetrically arranged in the inner cavity of the casting mold cavity of the valve body casting with the main flow gate and the four secondary flow gates having the same central axis.

[0009] Furthermore, a process method for automatically eliminating shrinkage in a valve body casting is provided: liquid raw materials of a main molding material are poured into the casting mold cavity of the valve body casting through a mainstream gate, the liquid raw materials flow through the mainstream gate to the secondary flow gate, and after the liquid raw materials penetrate into the casting mold cavity of the valve body casting, they flow through a branch channel to the sand core, and the liquid raw materials are finally formed in the sand core. During the molding process, the sand core is made more stable by the action of reinforcing ribs and core blocks, and no deformation occurs. At the same time, during the molding process, a control switch is connected to an external power supply to operate a drive motor, and the drive motor drives the rotating wheel to rotate through a rotating shaft, and at the same time drives the adjacent rotating wheel to rotate through a conveyor belt, thereby driving the movable shaft to rotate, and the movable shaft drives the outer sleeve to rotate, so that the semicircular protrusion can collide with the inner wall of the limiting sleeve, so that the limiting sleeve drives the casting mold cavity of the valve body casting to vibrate, thereby improving the density of the casting and reducing the tendency of the casting to form shrinkage.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. The present invention adds a secondary flow gate on the top of the casting mold cavity of the valve body casting. The main flow gate and the secondary flow gate can evenly and quickly transport the liquid raw material to the sand core for molding through the branch channel, thereby ensuring effective control of its temperature, increasing its molding speed and improving efficiency;

[0012] 2. The present invention simultaneously arranges reinforcing ribs and core blocks on the outer wall of the sand core, thereby enhancing the bending resistance of the sand core, ensuring that the surface of the molded product is smoother and will not deform, and at the same time, arranges risers to achieve a rapid condensation and shrinkage compensation effect, optimizes the material structure of the casting, and reduces shrinkage;

[0013] 3. In the present invention, a vibration device is connected to the casting mold cavity of the valve body casting. When the movable shaft in the vibration device rotates, it can drive the outer ring to rotate so that the semicircular protrusion collides with the limiting sleeve and vibrates the casting mold cavity of the valve body casting, thereby improving the density of the casting and reducing the tendency of the casting to form shrinkage when the casting is formed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention;

[0015] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0016] Figure 3 It is the left view of the structure of the present invention.

[0017] In the figure: 1. casting mold cavity of valve body casting; 2. main flow gate; 3. secondary flow gate; 4. riser; 5. through groove; 6. heat dissipation copper plate; 7. sand shooting hole; 8. heat dissipation hole; 9. vibration device; 91. support base; 92. drive motor; 93. rotating shaft; 94. movable shaft; 95. runner; 96. conveyor belt; 10. branch channel; 11. reinforcing rib; 12. sand core; 13. core block; 14. limit sleeve; 15. outer ring. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-3The present invention provides a technical solution: a process method for automatically eliminating the shrinkage phenomenon in a valve body casting, comprising a casting mold cavity 1 of a valve body casting, a main flow gate 2 is arranged at the middle position of the top of the casting mold cavity 1 of the valve body casting, and auxiliary flow gates 3 are arranged on both the front and rear sides of the top of the casting mold cavity 1 of the valve body casting, and the auxiliary flow gates 3 are arranged on the front and rear sides of the main flow gate 2, and the outer walls of the main flow gate 2 and the auxiliary flow gate 3 are both provided with risers 4, the main flow gate 2 and the auxiliary flow gate 3, and the two groups of auxiliary flow gates 3 are connected through a through groove 5, and the left and right sides of the top of the casting mold cavity 1 of the valve body casting are both provided with heat dissipation copper plates 6, and the top of the heat dissipation copper plates 6 are evenly provided with Heat dissipation holes 8, sand shooting holes 7 are arranged on the left and right outer walls of the casting mold cavity 1 of the valve body casting, a vibration device 9 is arranged at the bottom of the casting mold cavity 1 of the valve body casting, sand cores 12 are arranged on the left and right sides of the inner cavity of the casting mold cavity 1 of the valve body casting, and branch channels 10 are arranged on the left and right outer walls of the main flow gate 2 and the secondary flow gate 3, the other end of the branch channel 10 is connected to the sand core 12, and the outer wall of the sand core 12 is arranged with reinforcing ribs 11, core plates are arranged on the left and right inner walls of the casting mold cavity 1 of the valve body casting, and the other end of the core plate is connected to the core block 13, the other end of the core block 13 is connected to the outer wall of the sand core 12, and the core block 13 is arranged below the reinforcing rib 11.

[0020] The vibration device 9 includes a support base 91 movably arranged at the bottom of the casting mold cavity 1 of the valve body casting, a driving motor 92 is arranged on the inner wall of the inner cavity of the support base 91, and the output end of the driving motor 92 is connected to the rotating shaft 93. Four groups of limiting sleeves 14 are evenly arranged on the top of the support base 91, and the end surface of the limiting sleeve 14 close to the outer wall of the casting mold cavity 1 of the valve body casting is attached to the outer wall of the casting mold cavity 1 of the valve body casting. The inner cavity of the limiting sleeve 14 is movably inserted with a movable shaft 94, and the outer wall of the movable shaft 94 and the rotating shaft 93 close to the bottom are both sleeved with a rotating wheel 95, and the outer walls of the two adjacent groups of rotating wheels 95 are connected to a conveyor belt 96. When the rotating shaft 93 in the vibration device 9 rotates, it can drive the outer ring 15 to rotate so that the semicircular protrusion collides with the limiting sleeve 14 to vibrate the casting mold cavity of the valve body casting, thereby improving the density of the casting and reducing the tendency of the casting to form shrinkage during the molding of the casting;

[0021] An outer ring 15 is fixedly arranged on the outer wall of the movable shaft 94 near the top, and a semicircular protrusion is arranged on the outer wall of the outer ring 15, and the semicircular protrusion is movably connected with the inner walls of the front and rear sides of the limiting sleeve 14, so as to ensure that the outer ring 15 can collide with the inner wall of the limiting sleeve 14 when rotating, thereby generating a vibration effect;

[0022] A main flow gate 2 and four secondary flow gates 3 are arranged on the top of the casting mold cavity 1 of the valve body casting, and the aperture of the main flow gate 2 is larger than the aperture of the secondary flow gate 3 to ensure the fluidity of the liquid raw material when passing through the main flow gate 2 and the four secondary flow gates 3;

[0023] There are ten sand cores 12 in total, and the sand cores 12 are symmetrically arranged in the inner cavity of the casting mold cavity 1 of the valve body casting with the main flow gate 2 and the four secondary flow gates 3 having the same central axis, so as to determine the number of molded parts;

[0024] A process for automatically eliminating shrinkage in a valve body casting: liquid raw materials of a main molding material are poured into a casting mold cavity 1 of a valve body casting through a main flow gate 2, the liquid raw materials flow to a secondary flow gate 3 through the main flow gate 2, and after the liquid raw materials penetrate into the casting mold cavity 1 of the valve body casting, they flow to a sand core 12 through a branch flow channel 10, and the liquid raw materials are finally formed in the sand core 12. During the molding process, the sand core is made more stable by the action of reinforcing ribs and core blocks, and no deformation occurs. At the same time, during the molding process, a control switch is connected to an external power supply to operate a drive motor 92, and the drive motor 92 drives a rotating wheel 95 to rotate through a rotating shaft 93, and at the same time drives an adjacent rotating wheel 95 to rotate through a conveyor belt 96, thereby driving a movable shaft 94 to rotate, and the movable shaft 94 drives an outer sleeve 15 to rotate, so that the semicircular protrusion can collide with the inner wall of a limiting sleeve 14, so that the limiting sleeve 14 drives the casting mold cavity 1 of the valve body casting to vibrate, thereby improving the density of the casting and reducing the tendency of the casting to form shrinkage.

[0025] 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 the 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 process for automatically eliminating shrinkage in a valve body casting, comprising a casting mold cavity (1) of the valve body casting, characterized in that: A main flow gate (2) is arranged at the middle position of the top of the casting mold cavity (1) of the valve body casting, and auxiliary flow gates (3) are arranged on both the front and rear sides of the top of the casting mold cavity (1) of the valve body casting, and the auxiliary flow gates (3) are arranged on both the front and rear sides of the main flow gate (2), and the outer walls of the main flow gate (2) and the auxiliary flow gate (3) are arranged with risers (4), and the main flow gate (2) and the auxiliary flow gate (3) and the two groups of auxiliary flow gates (3) are connected through grooves (5), and heat dissipation copper plates (6) are arranged on both the left and right sides of the top of the casting mold cavity (1) of the valve body casting, and the heat dissipation copper plates (6) ) is evenly provided with heat dissipation holes (8) on the top, sand shooting holes (7) are provided on the left and right outer walls of the casting mold cavity (1) of the valve body casting, a vibration device (9) is provided at the bottom of the casting mold cavity (1) of the valve body casting, the vibration device (9) comprises a support base (91) movably provided at the bottom of the casting mold cavity (1) of the valve body casting, a drive motor (92) is provided on the inner wall of the inner cavity of the support base (91), the output end of the drive motor (92) is connected to a rotating shaft (93), four groups of limit sleeves (14) are evenly provided on the top of the support base (91), and the limit sleeves (14) ) The end surface of the outer wall of the casting mold cavity (1) close to the valve body casting is fitted on the outer wall of the casting mold cavity (1) of the valve body casting, the inner cavity of the limiting sleeve (14) is movably inserted into the movable shaft (94), the outer walls of the movable shaft (94) and the rotating shaft (93) close to the bottom are both sleeved with a rotating wheel (95), the outer walls of two adjacent groups of the rotating wheels (95) are connected to a conveyor belt (96), the outer wall of the movable shaft (94) close to the top is fixedly provided with an outer sleeve ring (15), the outer wall of the outer sleeve ring (15) is provided with a semicircular protrusion, and the semicircular protrusion is movably connected to the inner walls of the front and rear sides of the limiting sleeve (14) Sand cores (12) are arranged on both sides of the inner cavity of the casting mold cavity (1) of the valve body casting, and the outer walls of the left and right sides of the main flow gate (2) and the secondary flow gate (3) are arranged with diverter channels (10), the other end of the diverter channel (10) is connected to the sand core (12), and the outer wall of the sand core (12) is arranged with reinforcing ribs (11), the inner walls of the left and right sides of the casting mold cavity (1) of the valve body casting are arranged with core plates, and the other end of the core plates is connected to the core block (13), the other end of the core block (13) is connected to the outer wall of the sand core (12), and the core block (13) is arranged below the reinforcing rib (11).

2. A process for automatically eliminating the shrinkage phenomenon of valve body castings according to claim 1, characterized in that: A main flow gate (2) and four secondary flow gates (3) are arranged on the top of the casting mold cavity (1) of the valve body casting, and the aperture of the main flow gate (2) is larger than the aperture of the secondary flow gate (3).

3. The process for automatically eliminating the shrinkage phenomenon of valve body casting according to claim 2 is characterized in that: There are ten sand cores (12) in total, and the sand cores (12) are symmetrically arranged in the inner cavity of the casting mold cavity (1) of the valve body casting with the main flow gate (2) and the four secondary flow gates (3) on the same central axis.

4. A process for automatically eliminating shrinkage and loosening of a valve body casting according to claim 3: liquid raw material of a main molding material is poured into the casting mold cavity (1) of the valve body casting through the main flow gate (2), the liquid raw material flows to the secondary flow gate (3) through the main flow gate (2), and after the liquid raw material penetrates into the casting mold cavity (1) of the valve body casting, it flows to the sand core (12) through the branch channel (10), and the liquid raw material is finally formed in the sand core (12). During the forming process, the sand core is made more stable by the action of the reinforcing ribs and the core block, and deformation will not occur. During the molding process, the drive motor (92) is connected to an external power source through a control switch, and the drive motor (92) drives the rotating wheel (95) to rotate through the rotating shaft (93). At the same time, the adjacent rotating wheel (95) is driven to rotate through the conveyor belt (96), thereby driving the movable shaft (94) to rotate. The movable shaft (94) drives the outer ring (15) to rotate, so that the semicircular protrusion can collide with the inner wall of the limiting sleeve (14), so that the limiting sleeve (14) drives the casting mold cavity (1) of the valve body casting to vibrate, thereby improving the density of the casting and reducing the tendency of the casting to form shrinkage.

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