Demoulding mechanism for centrifugal casting

Abstract

The invention discloses a demolding mechanism for centrifugal casting. The demolding mechanism is characterized in that a lower mold comprises an outer mold part and an inner mold part which are arranged in a split mode; the inner die part comprises a lower die mounting base plate and an inner die mounted on the lower die mounting base plate; the demolding mechanism is used for automatically demolding between the iron core and the inner mold when the lower mold and the lower mold fixing seat are reset, and comprises a floating transition plate arranged between the outer mold part and the inner mold part in a floating manner; the other ends of the ejector rods penetrate through the inner die part and the lower die fixing seat; and the bosses are arranged at one ends of the ejector rods. The lower mold is arranged in a split mode and is divided into the outer mold part and the inner mold part, so that outer mold demolding and inner mold demolding are achieved during demolding, secondary demolding is formed between the iron core and the lower mold, driving force needed during demolding is reduced, meanwhile, the phenomenon that the iron core is galled due to powerful demolding is avoided, and the demolding quality is improved. The problem of inconvenient demolding is solved, and meanwhile the iron core casting quality is ensured.

Description

Technical Field

[0001] The invention relates to iron core centrifugal casting equipment, in particular to a demoulding mechanism for centrifugal casting. Background Art

[0002] In the prior art, a vacuum device is added to the rotor core in order to improve the quality of centrifugal casting. The rotor core is vacuumed during the casting of molten aluminum, which speeds up the flow of molten aluminum and discharges all the air inside the rotor core, so that there are no bubbles and cavities in the rotor core after casting, thereby achieving the effect of improving the casting density and casting quality. However, in the actual processing process, the pores in the aluminum liquid are evacuated during vacuuming, which increases the density of the casting, resulting in a tighter fit between the aluminum liquid and the lower mold cavity wall during casting. During demolding, the demolding device in the existing casting device is not strong enough to demold the rotor core from the lower mold. However, if the demolding force is increased by replacing the driving part in the demolding device, the core will be demolded due to strong push, resulting in roughening of the outer wall of the core, thereby affecting the casting quality of the core. To this end, a demolding mechanism for centrifugal casting is proposed. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems and to provide a demoulding mechanism for centrifugal casting.

[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical solution: a demolding mechanism for centrifugal casting, comprising a rotating shaft, a lower mold rotating disk connected to the rotating shaft, a lower mold fixing seat, and a lower mold installed on the lower mold fixing seat; wherein the lower mold comprises an outer mold portion and an inner mold portion which are arranged in a split manner; the inner mold portion comprises a lower mold mounting pad and an inner mold installed on the lower mold mounting pad; and further comprises a demolding mechanism for automatically demolding the iron core and the inner mold when the lower mold and the lower mold fixing seat are reset, wherein the demolding mechanism comprises a floating transition plate which is floatingly arranged between the outer mold portion and the inner mold portion, a plurality of ejector rods which are connected to the floating transition plate at one end and pass through the inner mold portion and the lower mold fixing seat at the other end, and a boss arranged at one end of the ejector rod.

[0005] Further preferably, it also includes an upper pad installed on the lower die fixing seat to limit the movement stroke of the ejector rod, and a spring sleeved on the ejector rod and located between the boss and the lower die fixing seat to push the ejector rod to return downward.

[0006] Further preferably, it also includes a guide sleeve installed on the lower mold fixing seat to guide the movement of the ejector rod.

[0007] Further preferably, the outer mold portion includes an outer mold connected to the floating transition plate and an outer mold base installed on the outer mold.

[0008] Further preferably, it also includes a lower mold rotating fan blade disk installed on the lower mold mounting pad to improve the heat dissipation effect.

[0009] Further preferably, the dryer is a mesh belt dryer.

[0010] Further preferably, it also includes a mold ejector rod movably installed between the rotating shaft, the lower mold rotating disk, and the lower mold fixing seat, and a stripping mandrel movably installed in the mold ejector rod for demolding the iron core and the outer mold.

[0011] The beneficial effects of the present invention are as follows: the lower mold is divided into an outer mold part and an inner mold part, so that demolding is divided into outer mold demolding and inner mold demolding, thereby forming a secondary demolding between the iron core and the lower mold, reducing the driving force required for demolding, and avoiding the phenomenon of iron core hair pulling due to strong demolding, thereby solving the problem of demolding inconvenience and ensuring the casting quality of the iron core; Through the arrangement of the demoulding mechanism, when the lower mold fixing seat and the lower mold are reset, the demoulding mechanism is driven by the reset force during descent to drive the outer mold part to move and demould the inner mold between the iron core and the inner mold. There is no need to add an additional driving device, which saves costs, improves the utilization rate of the entire device, and also improves the demoulding efficiency and demoulding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a partial cross-sectional structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the local cross-sectional structure of the lower mold in the present invention; Figure 4 It is a partial cross-sectional structural schematic diagram of the present invention.

[0013] Legend: 1. Rotating shaft; 2. Lower die rotating disk; 3. Lower die fixing seat; 4. Lower die; 5. Outer die portion; 51. Outer die; 52. Outer die seat; 6. Inner die portion; 61. Lower die mounting pad; 62. Inner die; 7. Demolding mechanism; 71. Floating transition plate; 72. Ejector rod; 73. Boss; 8. Upper pad; 81. Spring; 83. Lower pad; 9. Guide sleeve; 91. Lower die rotating impeller disk; 10. Mold closing ejector rod; 11. Material removal mandrel. DETAILED DESCRIPTION

[0014] Next, we will further explain the demoulding mechanism for centrifugal casting described in the present invention in conjunction with the accompanying drawings.

[0015] It should be noted that all directional indications such as up, down, left, right, front, back, etc. in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0016] In the present invention, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. should be understood in a broad sense; for example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] See also Figure 1-Figure 4 As shown in, a demoulding mechanism for centrifugal casting comprises a rotating shaft 1, a lower mold rotating disk 2 connected to the rotating shaft 1, a lower mold fixing seat 3, and a lower mold 4 installed on the lower mold fixing seat 3; the lower mold 4 comprises an outer mold part 5 and an inner mold part 6 which are arranged in a split type; the inner mold part 6 comprises a lower mold mounting pad 61 and an inner mold 62 installed on the lower mold mounting pad 61; and further comprises a demoulding mechanism 7 for automatically demoulding the iron core and the inner mold 62 when the lower mold 4 and the lower mold fixing seat 3 are reset, the demoulding mechanism 7 comprises a floating transition plate 71 which is floatingly arranged between the outer mold part 5 and the inner mold part 6, a plurality of ejector pins 72 which are connected to the floating transition plate 71 at one end and pass through the inner mold part 6 and the lower mold fixing seat 3 at the other end, and a boss 73 which is arranged at one end of the ejector pin 72; The length of the ejector rod 72 is longer than the height of the lower die mounting pad 61 and the lower die fixing seat 3, and the longer part is the driving section, so that when the lower die fixing seat 3 is reset downward, the bottom of the boss 73 first contacts the lower die rotating disk 2, and when the lower die fixing seat 3 continues to move downward, the length of the driving section forms a thrust on the floating transition plate 71, so that the floating transition plate 71 and the upper die part move upward, thereby driving the iron core and the inner die 62 to be demoulded; By setting the lower mold 4 in a split type, it is divided into an outer mold part 5 and an inner mold part 6, so that when demolding, it is divided into demolding of the outer mold 51 and demolding of the inner mold 62, so that secondary demolding is formed between the iron core and the lower mold 4, reducing the driving force required for demolding, and avoiding the phenomenon of iron core hair pulling due to strong demolding, solving the problem of demolding inconvenience while ensuring the casting quality of the iron core; Through the arrangement of the demoulding mechanism 7, when the lower mold fixing seat 3 and the lower mold 4 are reset, the demoulding mechanism 7 is driven by the reset force during descent to drive the outer mold part 5 to move, so as to demould the inner mold 62 between the iron core and the inner mold 62. There is no need to add an additional driving device, which saves costs, improves the utilization rate of the entire device, and also improves the demoulding efficiency and demoulding quality.

[0018] In one embodiment, it also includes an upper pad 8 mounted on the lower die fixing seat 3 to limit the movement stroke of the ejector rod 72, and a spring 81 sleeved on the ejector rod 72 and located between the boss 73 and the lower die fixing seat 3 to push the ejector rod 72 to return downward; By setting the upper pad 8, the upward movement stroke of the push rod 72 is limited to avoid overtravel; by setting the spring 81, when the push rod 72 is not subjected to an upward force, it is reset downward by the reset force of the spring 81, and at the same time, the floating transition plate 71 is reset when the push rod 72 is reset downward.

[0019] In one embodiment, it also includes a guide sleeve 9 installed on the lower mold fixing base 3 to guide the movement of the push rod 72; through the setting of the guide sleeve 9, the up and down movement of the push rod 72 is guided.

[0020] In one embodiment, a lower pad 83 installed on the lower mold rotating disk 2 is also included; the lower pad 83 is used to contact the boss 73 and support it.

[0021] In one embodiment, the outer mold portion 5 includes an outer mold 51 connected to the floating transition plate 71 and an outer mold base 52 installed on the outer mold 51; during the movement of the floating transition plate 71, the outer mold 51 and the outer mold base 52 are driven to move synchronously.

[0022] In one embodiment, it also includes a lower mold rotating fan blade disk 91 installed on the lower mold mounting pad 61 to improve the heat dissipation effect.

[0023] In one embodiment, it also includes a mold push rod 10 movably installed between the rotating shaft 1, the lower mold rotating disk 2, and the lower mold fixing seat 3, and a stripping mandrel 11 movably installed in the mold push rod 10 for demolding the iron core and the outer mold part 5; through the setting of the stripping mandrel 11, it is used to push the iron core upward to demold the core and the outer mold 51, thereby realizing secondary demolding.

[0024] When the present invention is in use: the rotating shaft 1 in the present invention is connected to a device in the centrifugal casting device that drives the rotating shaft 1 to rotate, the mold clamping ejector 10 is connected to a driver for driving it to move up and down, and the material withdrawal mandrel 11 is also connected to a driver for driving it to move up and down, and the driver can be a cylinder or a servo device; When the rotor core is centrifugally cast, the driver drives the mold pin 10 to move downward and reset, and the mold pin 10 drives the lower mold fixing seat 3, the lower mold 4, and the core to move downward. During the downward movement of the lower mold fixing seat 3, the boss 73 of the pin 72 first contacts the lower pad 83, and the pin 72 is supported by the lower pad 83. During the continuous downward movement of the lower mold fixing seat 3, the pin 72 forms a thrust on the floating transition plate 71, and the floating transition plate 71 applies the thrust. The lower mold fixing seat 3 moves downward to the outer mold 51, the iron core and the outer mold seat 52, and at the same time, the lower mold fixing seat 3 drives the lower mold mounting pad 61 and the lower mold 4 to apply a downward force, and under the action of two opposite forces, the iron core and the inner mold 62 are driven to separate, and one demolding is automatically achieved; after the lower mold fixing seat 3 moves downward into position, the material return mandrel 11 is driven upward by the control driver, and the iron core is pushed upward by the material return mandrel 11 to separate the iron core from the outer mold 51, realizing secondary demolding. After two demoldings, the iron core is completely demolded.

[0025] The protection scope of the present invention is not limited to the above embodiments and their variations. Conventional modifications and replacements made by those skilled in the art based on the contents of this embodiment all fall within the protection scope of the present invention.

Claims

1. A demoulding mechanism for centrifugal casting, comprising a rotating shaft (1), a lower mold rotating disk (2) connected to the rotating shaft (1), a lower mold fixing seat (3), and a lower mold (4) mounted on the lower mold fixing seat (3); wherein: The lower mold (4) comprises an outer mold portion (5) and an inner mold portion (6) which are arranged in a split manner; the inner mold portion (6) comprises a lower mold mounting pad (61) and an inner mold (62) mounted on the lower mold mounting pad (61); and also comprises a demoulding mechanism (7) for automatically demoulding the iron core and the inner mold (62) when the lower mold (4) and the lower mold fixing seat (3) are reset, wherein the demoulding mechanism (7) comprises a floating transition plate (71) which is floatingly arranged between the outer mold portion (5) and the inner mold portion (6), a plurality of ejector pins (72) which are connected to the floating transition plate (71) at one end and pass through the inner mold portion (6) and the lower mold fixing seat (3) at the other end, and a boss (73) which is arranged at one end of the ejector pins (72).

2. A demoulding mechanism for centrifugal casting according to claim 1, characterized in that: It also includes an upper pad (8) mounted on the lower die fixing seat (3) and having a limiting effect on the travel of the ejector rod (72), and a spring (81) sleeved on the ejector rod (72) and located between the boss (73) and the lower die fixing seat (3) and used to push the ejector rod (72) to return downward.

3. A demoulding mechanism for centrifugal casting according to claim 2, characterized in that: It also includes a guide sleeve (9) mounted on the lower die fixing seat (3) and guiding the movement of the ejector rod (72).

4. The demoulding mechanism for centrifugal casting according to claim 1, characterized in that: It also includes a lower pad (83) mounted on the lower mold rotating disk (2).

5. The demoulding mechanism for centrifugal casting according to claim 1, characterized in that: The outer mold part (5) comprises an outer mold (51) connected to the floating transition plate (71) and an outer mold base (52) mounted on the outer mold (51).

6. The demoulding mechanism for centrifugal casting according to claim 1, characterized in that: It also includes a lower mold rotating fan blade disk (91) mounted on the lower mold mounting pad (61) to improve the heat dissipation effect.

7. The demoulding mechanism for centrifugal casting according to claim 1, characterized in that: It also includes a mold ejector pin (10) movably mounted between the rotating shaft (1), the lower mold rotating disk (2), and the lower mold fixing seat (3), and a material stripping mandrel (11) movably mounted in the mold ejector pin (10) for stripping the iron core from the outer mold portion (5).

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