Die-casting die structure capable of achieving ejector-pin-free demolding of fixed die heat dissipation teeth

Abstract

The invention belongs to the technical field of die-casting equipment, and discloses a die-casting die structure for realizing ejector-pin-free demolding of heat dissipation teeth of a fixed die, the die-casting die structure comprises the fixed die, a first movable die, a second movable die and a third movable die, the first movable die is provided with a first boss, the fixed die is provided with a second boss, the first boss is provided with a first end face opposite to the second boss, and the third movable die is provided with a second end face opposite to the second boss. The second boss partially covers the first end face, the second movable die extends towards the second boss and partially covers the first end face, and the second movable die is driven by a second driving mechanism to be close to or away from the first boss. The first movable mold is driven by a first driving mechanism to drive the second movable mold to get close to or away from the fixed mold; the third movable mold is arranged in the first movable mold in a penetrating mode, is driven by a third driving mechanism to stretch out and draw back and can stretch out towards the first end face. According to the die-casting die structure for achieving ejector-pin-free demolding of the fixed die heat dissipation teeth, ejector pins do not need to be arranged between the heat dissipation teeth, product demolding can be smooth, and the weight of a product is not additionally increased.

Description

Technical Field

[0001] The invention belongs to the technical field of die-casting equipment, and in particular relates to a die-casting mold structure that realizes ejector-free demoulding of fixed mold heat dissipation teeth. Background Art

[0002] Under the general trend of global energy transformation, the market demand for photovoltaic inverters continues to grow. In order to ensure that photovoltaic inverters can operate stably and reliably under various complex environmental conditions, higher requirements are placed on the quality and heat dissipation design of electronic components.

[0003] Specifically for die-cast heat dissipation housings, in addition to the improvement of heat dissipation effect requirements, the weight and appearance requirements of heat dissipation housings are also getting higher and higher. However, new designs that improve heat dissipation effects often bring about problems such as increased clamping force, which leads to difficulty in demolding products, increased risk of deformation and sticking to the mold. At present, the most commonly used solution is to set ejectors on the top of the heat dissipation teeth. This structure is simple and reliable, but the disadvantage is that the addition of ejectors to the heat dissipation teeth requires the addition of ejector tables, which increases the weight of the product itself. The ejector marks and burrs produced by the ejectors on the die-casting parts need to be polished or machined to remove, otherwise they will seriously affect the appearance. If the heat dissipation teeth need to be machined later to ensure the appearance, it is not only a problem of the increased weight itself, but more importantly, it affects the production cost. If the ejector is placed at the root between the heat dissipation teeth and a smaller ejector is used, theoretically, the problem of ejector marks leaking on the surface can be solved and the product can be effectively demolded. However, in order to improve the heat dissipation effect, the heat dissipation teeth spacing of the current products are getting smaller and smaller, and the heat dissipation teeth are getting denser and denser. Considering the strength of the die-casting mold, the ejector cannot be placed at the root, and the risk of smaller ejector pins breaking is greater. Therefore, it is currently a major problem to ensure that the heat dissipation housing can be smoothly demolded during the production process and meet the appearance requirements from the perspective of the mold structure. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a die-casting mold structure that can realize ejector-free demoulding of fixed mold heat dissipation teeth. No ejector is required between the heat dissipation teeth, so that the product can be demoulded smoothly without increasing the weight of the product.

[0005] In order to solve the above technical problems, the present invention provides a die-casting mold structure for realizing ejector-free demoulding of fixed mold heat dissipation gears, comprising a fixed mold, a movable mold assembly, a first driving mechanism, a second driving mechanism and a third driving mechanism, wherein the movable mold assembly comprises a first movable mold, a second movable mold and a third movable mold.

[0006] The first movable mold is provided with a first boss, the fixed mold is provided with a second boss, the first boss is provided with a first end face opposite to the second boss, and a first side face opposite to the second movable mold, the second boss partially covers the first end face, the second movable mold is located between the fixed mold and the first movable mold, the second movable mold extends toward the second boss and partially covers the first end face, the second movable mold is driven by the second driving mechanism to approach or move away from the first boss; the first movable mold is driven by the first driving mechanism to drive the second movable mold to approach or move away from the fixed mold;

[0007] The third movable mold is disposed inside the first movable mold, and the third movable mold is driven by the third driving mechanism to be retracted and extended, and can extend toward the first end surface;

[0008] The fixed mold, the first movable mold, the second movable mold and the third movable mold cooperate to form a heat dissipation cavity.

[0009] As an improvement of the above scheme, the heat dissipation cavity includes a first tooth profile cavity, a first tooth root cavity and a seat body cavity, the first tooth profile cavity is formed on the second boss, the first movable mold, the third movable mold and the fixed mold cooperate to form the first tooth root cavity, at least one of the first movable mold and the third movable mold cooperates with the second movable mold to form the seat body cavity, and the first tooth root cavity is communicated with the first tooth profile cavity and the seat body cavity.

[0010] As an improvement of the above scheme, the heat dissipation cavity also includes a second tooth profile cavity and a second tooth root cavity, the second movable mold cooperates with the fixed mold to form the second tooth profile cavity, at least one of the first movable mold and the third movable mold cooperates with the second movable mold and the fixed mold to form the second tooth root cavity, and the second tooth root cavity is connected with the second tooth profile cavity, the first tooth root cavity, and the seat cavity.

[0011] As an improvement of the above scheme, the third movable mold includes a first mold rod unit, and the end face of the first mold rod unit opposite to the first tooth profile cavity is provided with an oblique groove, the oblique groove is arranged at the side wall opening of the first mold rod unit, and the cross-sectional area of ​​the oblique groove gradually increases in the direction away from the first tooth profile cavity.

[0012] As an improvement of the above solution, the first movable mold and the third movable mold are both arranged below the fixed mold, and the first mold rod unit is arranged opposite to the first tooth root cavity.

[0013] As an improvement of the above solution, the third movable mold includes a second mold rod unit, the first boss is provided with a through hole adapted to the second mold rod unit, and the end surface of the second mold rod unit coincides with the through hole.

[0014] As an improvement of the above scheme, the seat body cavity includes a first seat body cavity and a second seat body cavity, the first seat body cavity extends along the arrangement direction of the first tooth profile cavity, the second seat body cavity forms a preset angle with the first seat body cavity, and the second seat body cavity extends in a direction away from the first tooth profile cavity.

[0015] As an improvement of the above scheme, the second movable mold includes a second mold core and a second slider, the second mold core is connected to the second slider, the second slider is provided with an inclined surface on the side facing away from the second mold core, and the fixed mold is provided with a wedge block adapted to the inclined surface. When the first driving mechanism drives the first movable mold and the second movable mold to approach the fixed mold, the second movable mold is gradually pressed against the wedge block, the fixed mold, and the first movable mold.

[0016] As an improvement of the above scheme, the first movable mold is provided with a third boss, the third boss is provided with a second end face and a second side face, the first boss is formed on the second end face, the second movable mold is driven by the second driving mechanism to slide along the second end face, and when the second movable mold abuts against the second side face, at least one of the first movable mold and the third movable mold cooperates with the second movable mold to form the seat cavity.

[0017] In addition, the present invention also provides a demoulding method for the die-casting mold structure based on the above-mentioned fixed mold heat dissipation gear without ejector pin demoulding, which comprises the following steps:

[0018] S1, drive the movable mold assembly to move completely away from the fixed mold, so that the product remains on the movable mold assembly;

[0019] S2, driving the second movable mold to move until it is completely separated from the product;

[0020] S3, driving the third movable mold to move until the product is completely separated from the first movable mold.

[0021] The implementation of the present invention has the following beneficial effects:

[0022] The present invention discloses a die-casting mold structure for realizing ejector-free demoulding of heat dissipation teeth of a fixed mold, wherein a second movable mold is arranged between the fixed mold and the first movable mold, a first boss is arranged on the first movable mold, and a second boss is arranged on the fixed mold, wherein the second boss partially covers a first end face of the first boss, and the second movable mold is not only opposite to the first side face of the first boss, but also extends toward the second boss, and the second movable mold is driven by a second driving mechanism to approach the first boss, so that the second movable mold can partially cover the first end face. When the first driving mechanism drives the first movable mold away from the fixed mold, the first fixed mold drives the second fixed mold away from the fixed mold together, and the part of the second fixed mold covering the first end face can drive the product formed in the heat dissipation cavity away from the fixed mold together; the second movable mold is driven by the second driving mechanism to move away from the first boss, so that the second movable mold can be separated from the product, and the third driving mechanism drives the third movable mold to extend toward the first end face, so that the product can be ejected from the first movable mold, so that demoulding is realized without setting an ejector between the heat dissipation teeth, and the product demoulding is smooth without additionally increasing the weight of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a first embodiment of a die-casting mold structure for realizing ejector-free demoulding of fixed mold heat dissipation gears of the present invention;

[0024] Figure 2 yes Figure 1 A schematic diagram of an enlarged first structure of part A;

[0025] Figure 3 yes Figure 1 Part A is an enlarged schematic diagram of the second structure. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] like Figures 1 to 3As shown, the present invention discloses an embodiment of a die-casting mold structure with heat dissipation teeth of a fixed mold 1 and no ejector demolding, comprising a fixed mold 1, a movable mold assembly, a first driving mechanism, a second driving mechanism and a third driving mechanism, the movable mold assembly comprises a first movable mold 2, a second movable mold 3 and a third movable mold 4, the first movable mold 2 is provided with a first boss 211, the fixed mold 1 is provided with a second boss 111, the first boss 211 is provided with a first end face a opposite to the second boss 111, and a first side face b opposite to the second movable mold 3, the second boss 111 partially covers the first end face a, the second movable mold 3 is located between the fixed mold 1 and the first movable mold 2, the second movable mold 3 extends toward the second boss 111 and partially covers the first end face a, and the second movable mold 3 is driven by the second driving mechanism to approach or move away from the first boss 211; the first movable mold 2 is driven by the first driving mechanism to drive the second movable mold 3 to approach or move away from the fixed mold 1; the third movable mold 4 is penetrated in the first movable mold 2, and the third movable mold 4 is driven by the third driving mechanism to retract and extend, and can extend toward the first end face a; the fixed mold 1, the first movable mold 2, the second movable mold 3 and the third movable mold 4 cooperate to form a heat dissipation cavity.

[0028] In this embodiment, the second movable mold 3 is arranged between the fixed mold 1 and the first movable mold 2, the first boss 211 is arranged on the first movable mold 2, and the second boss 111 is arranged on the fixed mold 1. The second boss 111 partially covers the first end face a of the first boss 211. In addition to being opposite to the first side face b of the first boss 211, the second movable mold 3 also extends to the second boss 111. The second movable mold 3 is driven by the second driving mechanism to approach the first boss 211, so that the second movable mold 3 can partially cover the first end face a. When the first driving mechanism drives the first movable mold 2 away from the fixed mold 1, the first fixed mold 1 drives the second fixed mold 1 away from the fixed mold 1 together, and the part of the second fixed mold 1 covering the first end face a can drive the product formed in the heat dissipation cavity away from the fixed mold 1 together; the second driving mechanism drives the second movable mold 3 away from the first boss 211, so that the second movable mold 3 can be separated from the product, and the third driving mechanism drives the third movable mold 4 to extend toward the first end face a, so that the product can be ejected from the first movable mold 2, so that demoulding is achieved without setting an ejector pin between the heat dissipation teeth, and the product demoulding is smooth without additionally increasing the weight of the product.

[0029] Specifically, the fixed mold 1 of this embodiment includes a fixed mold plate 12 and a fixed mold core 11 arranged on the fixed mold plate 12, and the second boss 111 is arranged on the fixed mold core 11; the first movable mold 2 includes a first movable mold plate 22 and a first movable mold core 21 arranged on the first movable mold plate 22, the first boss 211 is arranged on the first movable mold core 21, and the first driving mechanism is connected to the first movable mold plate 22 to drive the first movable mold 2 to reciprocate in the first direction; the second movable mold 3 includes a second mold core 31 and a second slider 32, and the second mold core 31 extends into the fixed mold core 11 and the first movable mold core 21. Between the mold cores 21, the second slider 32 is slidably matched with the first movable mold plate 22, and the second driving mechanism is connected to the second slider 32 to drive the second movable mold 3 to reciprocate in the second direction; the third movable mold 4 includes a third movable mold movable plate 41, and a mold rod unit (including a first mold rod unit 42 and a second mold rod unit 43) connected to the third movable mold movable plate 41 and inserted into the first movable mold 2, the mold rod unit of the third movable mold 4 is opposite to the second boss 111 of the fixed mold 1, and the third driving mechanism drives the third movable mold 4 to reciprocate in the first direction. When the first driving mechanism drives the first movable mold 2 to reciprocate in the first direction, the second movable mold 3 reciprocates with the first movable mold 2 in the first direction. The first driving mechanism and the third driving mechanism respectively drive the first movable mold 2 and the third movable mold 4 to reciprocate in the same direction. The first driving mechanism, the second driving mechanism, and the third driving mechanism are preferably hydraulic cylinders 6.

[0030] The mold of this embodiment also includes a base 7 and a support seat 8. The first movable mold plate 22 is arranged on the support seat 8. The third driving mechanism, the third movable mold fixed plate 9 and the third movable mold movable plate 41 are all arranged in the cavity between the first movable mold plate 22 and the support seat 8. The third driving mechanism drives the third movable mold movable plate 41 to reciprocate along the first direction relative to the third movable mold fixed plate 9.

[0031] The second slider 32 is connected to the second mold core 31. The second slider 32 is provided with an inclined surface on the side facing away from the second mold core 31. The fixed mold plate 12 of the fixed mold 1 is provided with a wedge block 121 adapted to the inclined surface. When the first driving mechanism drives the first movable mold 2 and the second movable mold 3 to approach the fixed mold 1, the second movable mold 3 gradually presses against the wedge block 121, the fixed mold 1 and the first movable mold 2.

[0032] The heat dissipation cavity of this embodiment includes a first tooth profile cavity c, a first tooth root cavity d and a seat body cavity e. The first tooth profile cavity c is formed on the surface of the second boss 111 opposite to the first boss 211. The first movable mold 2, the third movable mold 4 and the fixed mold 1 cooperate to form the first tooth root cavity d. The first tooth root cavity d is extended along the arrangement direction of the first tooth profile cavity c and is used to connect two adjacent first tooth profile cavities c. The second movable mold 3 is symmetrically arranged on the periphery of the heat dissipation cavity. At least one of the first movable mold 2 and the third movable mold 4 cooperates with the second movable mold 3 to form a seat body cavity e. The first tooth root cavity d is connected with the first tooth profile cavity c and the seat body cavity e. The first tooth profile cavity c and the first tooth root cavity d are used to form the heat dissipation teeth of the heat dissipation product and the tooth root part connected between the heat dissipation teeth. The seat body cavity e is used to form the heat dissipation base part of the heat dissipation product.

[0033] In addition to the first tooth profile cavity c, the first tooth root cavity d and the seat body cavity e, the heat dissipation cavity of this embodiment preferably also includes a second tooth profile cavity f and a second tooth root cavity g. The second movable mold 3 cooperates with the second boss 111 of the fixed mold 1 to form the second tooth profile cavity f. The first tooth profile cavity c is arranged in the middle area of ​​the heat dissipation tooth forming surface, and the second tooth profile cavity f is formed at the outer edge portion of the heat dissipation tooth forming surface. At least one of the first movable mold 2 and the third movable mold 4 cooperates with the second movable mold 3 and the fixed mold 1 to form the second tooth root cavity g, and the second tooth root cavity g is connected with the second tooth profile cavity f, the first tooth root cavity d and the seat body cavity e. The second tooth profile cavity f and the second tooth root cavity g increase the contact area between the second movable mold 3 and the radiator product in the heat dissipation cavity, and the second movable mold 3 is driven by the second driving mechanism to hold the product parts corresponding to the second tooth profile cavity f and the seat body cavity e, so as to help pull the product out of the first tooth profile cavity c of the fixed mold 1, so that the heat dissipation tooth can be smoothly demolded from the fixed mold 1.

[0034] The first movable mold 2 is also provided with a third boss 212, and the third boss 212 is provided with a second end face h and a second side face i. The first boss 211 is formed on the second end face h. The second movable mold 3 is driven by the second driving mechanism to slide along the second end face h. When the second movable mold 3 abuts against the second side face i, at least one of the first movable mold 2 and the third movable mold 4 cooperates with the second movable mold 3 to form a seat cavity e.

[0035] The seat body cavity e is extended along the first end face a and the second side face i of the first boss 211, and specifically includes a first seat body cavity e1 and a second seat body cavity e2. The first seat body cavity e1 is extended along the arrangement direction of the first tooth profile cavity c, and the second seat body cavity e2 forms a preset angle with the first seat body cavity e1, and the second seat body cavity e2 is extended in a direction away from the first tooth profile cavity c.

[0036] The third movable mold 4 specifically includes a first mold rod unit 42 and a second mold rod unit 43. An oblique groove 421 is provided on the end surface of the first mold rod unit 42 opposite to the first tooth-shaped cavity c. The oblique groove 421 is set at the side wall opening of the first mold rod unit 42, and the cross-sectional area of ​​the oblique groove 421 gradually increases in the direction away from the first tooth-shaped cavity c. The third driving mechanism drives the first mold rod unit 42 to contract, that is, the oblique groove 421 of the third driving mechanism forms a barb structure, which can hook the product in the heat dissipation cavity and provide a pulling force for the heat sink product during the separation of the movable mold assembly from the fixed mold 1.

[0037] In this embodiment, the first movable mold 2 and the third movable mold 4 are preferably arranged below the fixed mold 1, and the weight of the heat sink product can be used to help the heat dissipation teeth separate from the fixed mold 1 during demoulding. At this time, the first driving mechanism drives the first movable mold 2 and the second movable mold 3 to reciprocate in the first direction, and the third driving mechanism drives the third movable mold movable plate 41 to reciprocate in the first direction relative to the third movable mold fixed plate 9. The first direction is the vertical direction, and the second driving mechanism drives the second movable mold 3 to reciprocate in the second direction. The second direction is the horizontal direction.

[0038] At the same time, the first mold rod unit 42 is telescopically and evenly distributed on the first end surface a. The first mold rod unit 42 is arranged opposite to the first tooth root cavity d to provide uniform pulling force to various parts of the radiator product.

[0039] The first boss 211 is provided with a through hole adapted to the second mold bar unit 43, and the end face of the second mold bar unit 43 coincides with the through hole. When the third driving mechanism drives the first mold bar unit 42 and the second mold bar unit 43 to extend out of the first end face a, the first mold bar unit 42 and the second mold bar unit 43 act as ejectors, which can help to eject the product from the first boss 211, wherein the contact area between the second mold bar unit 43 and the product is relatively large, and the second mold bar unit 43 is preferably arranged outside the area where the first mold bar units 42 are distributed, so as to form a more stable support for the product, and facilitate automated equipment such as a robot to move the demoulded product out of the mold.

[0040] The mold structure of the present invention is simple, and demoulding is stable and reliable. No ejector pins are arranged on the tops between the heat dissipation teeth, and there is no ejector platform. The weight of the product will not increase, and the original appearance design of the heat dissipation teeth of the product will not be changed.

[0041] In addition, the present invention also provides a demoulding method for the die-casting mold structure based on the above-mentioned fixed mold 1 heat dissipation teeth without ejector demoulding, which comprises the following steps:

[0042] S1, drive the movable mold assembly to move to completely separate from the fixed mold 1, so that the product remains on the movable mold assembly;

[0043] This step is used to drive the movable mold assembly and the fixed mold 1 to open the mold. Specifically, the first driving mechanism drives the first movable mold 2 and the second movable mold 3 to move downward, and the third driving mechanism drives the third movable mold 4 to move downward. Under the action of the second movable mold 3 and the third movable mold 4, specifically the downward thrust of the second movable mold 3 on the product part corresponding to the first seat cavity e1, the clamping force of the first boss 211 and the second movable mold 3 on both sides of the product part corresponding to the second seat cavity e2, the friction force of the second movable mold 3 on the product part corresponding to the second tooth cavity f, and the downward pulling force generated by the inclined groove 421 structure on the first mold rod unit 42, the radiator product is separated from the fixed mold 1 along with the movable mold assembly.

[0044] S2, driving the second movable mold 3 to move until it is completely separated from the product;

[0045] At this time, the two opposite second driving mechanisms respectively drive the corresponding second movable molds 3 away from each other, that is, the second movable mold 3 moves horizontally, and the second movable mold 3 is separated from the first movable mold 2 and the fixed mold 1, that is, the second movable mold 3 is separated from the product.

[0046] S3, driving the third movable mold 4 to move until the product is completely separated from the first movable mold 2.

[0047] At this time, the third driving mechanism drives the first mold rod unit 42 and the second mold rod unit 43 of the third movable mold 4 to rise, and pushes the product away from the first movable mold 2 .

[0048] Finally, the picking robot picks up the product from the first mold rod unit 42 and the second mold rod unit 43 and sends it to the conveyor belt, and a production cycle is completed.

[0049] The above disclosure is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A die-casting mold structure for realizing ejector-free demoulding of fixed mold heat dissipation gears, characterized in that: It includes a fixed mold, a movable mold assembly, a first driving mechanism, a second driving mechanism and a third driving mechanism, wherein the movable mold assembly includes a first movable mold, a second movable mold and a third movable mold, The first movable mold is provided with a first boss, the fixed mold is provided with a second boss, the first boss is provided with a first end face opposite to the second boss, and a first side face opposite to the second movable mold, the second boss partially covers the first end face, the second movable mold is located between the fixed mold and the first movable mold, the second movable mold extends toward the second boss and partially covers the first end face, and the second movable mold is driven by the second driving mechanism to approach or move away from the first boss; The first movable mold is driven by the first driving mechanism to drive the second movable mold to approach or move away from the fixed mold; The third movable mold is disposed inside the first movable mold, and the third movable mold is driven by the third driving mechanism to be retracted and extended, and can extend toward the first end surface; The fixed mold, the first movable mold, the second movable mold and the third movable mold cooperate to form a heat dissipation cavity.

2. The die-casting mold structure for realizing ejector-free demoulding of fixed mold heat dissipation gears according to claim 1, characterized in that: The heat dissipation cavity includes a first tooth profile cavity, a first tooth root cavity and a seat body cavity, the first tooth profile cavity is formed on the second boss, the first movable mold, the third movable mold and the fixed mold cooperate to form the first tooth root cavity, at least one of the first movable mold and the third movable mold cooperates with the second movable mold to form the seat body cavity, and the first tooth root cavity is communicated with the first tooth profile cavity and the seat body cavity.

3. The die-casting mold structure for realizing ejector-free demoulding of fixed mold heat dissipation gears as claimed in claim 2, characterized in that: The heat dissipation cavity also includes a second tooth profile cavity and a second tooth root cavity. The second movable mold cooperates with the fixed mold to form the second tooth profile cavity. At least one of the first movable mold and the third movable mold cooperates with the second movable mold and the fixed mold to form the second tooth root cavity. The second tooth root cavity is connected with the second tooth profile cavity, the first tooth root cavity, and the seat cavity.

4. The die-casting mold structure for realizing ejector-free demoulding of fixed mold heat dissipation gears as claimed in claim 2, characterized in that: The third movable mold includes a first mold rod unit, and an oblique groove is provided on the end surface of the first mold rod unit opposite to the first tooth profile cavity. The oblique groove is set at the side wall opening of the first mold rod unit, and the cross-sectional area of ​​the oblique groove gradually increases in the direction away from the first tooth profile cavity.

5. The die-casting mold structure for realizing ejector-free demoulding of fixed mold heat dissipation gears as claimed in claim 4, characterized in that: The first movable mold and the third movable mold are both arranged below the fixed mold, and the first mold rod unit is arranged opposite to the first tooth root cavity.

6. The die-casting mold structure for realizing ejector-free demoulding of fixed mold heat dissipation gears according to claim 1, characterized in that: The third movable mold includes a second mold rod unit, the first boss is provided with a through hole adapted to the second mold rod unit, and the end surface of the second mold rod unit coincides with the through hole.

7. The die-casting mold structure for realizing ejector-free demoulding of fixed mold heat dissipation gears as claimed in claim 2, characterized in that: The seat body cavity includes a first seat body cavity and a second seat body cavity, the first seat body cavity is extended along the arrangement direction of the first tooth profile cavity, the second seat body cavity forms a preset angle with the first seat body cavity, and the second seat body cavity is extended in a direction away from the first tooth profile cavity.

8. The die-casting mold structure for realizing ejector-free demoulding of fixed mold heat dissipation gears according to claim 1, characterized in that: The second movable mold includes a second mold core and a second slider, the second mold core is connected to the second slider, a slope is provided on the side of the second slider away from the second mold core, and the fixed mold is provided with a wedge block adapted to the slope, when the first driving mechanism drives the first movable mold and the second movable mold to approach the fixed mold, the second movable mold is gradually pressed against the wedge block, the fixed mold and the first movable mold.

9. The die-casting mold structure for realizing ejector-free demoulding of fixed mold heat dissipation gears as claimed in claim 2, characterized in that: The first movable mold is provided with a third boss, and the third boss is provided with a second end face and a second side face. The first boss is formed on the second end face, and the second movable mold is driven by the second driving mechanism to slide along the second end face. When the second movable mold abuts against the second side face, at least one of the first movable mold and the third movable mold cooperates with the second movable mold to form the seat cavity.

10. A demoulding method for a die-casting mold structure for realizing ejector-free demoulding of fixed mold heat dissipation gears based on any one of claims 1 to 9, characterized in that: The following steps are involved: S1, drive the movable mold assembly to move completely away from the fixed mold, so that the product remains on the movable mold assembly; S2, driving the second movable mold to move until it is completely separated from the product; S3, driving the third movable mold to move until the product is completely separated from the first movable mold.

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