Local pressurizing die-casting die for upper cover

Abstract

The utility model discloses an upper cover local pressurization die-casting die, and belongs to the technical field of die-casting dies. Comprising an upper die and a lower die which are respectively provided with an upper die core and a lower die core, and after the upper die and the lower die are assembled, the upper die core and the lower die core are encircled to form a cavity for forming the appearance of an upper cover product; a through hole is formed in the lower mold core in a penetrating mode and communicates with the cavity. And the oil cylinder is arranged on the lower die and located at the bottom of the lower die core, a piston rod of the oil cylinder is upwards ejected into the through hole, and when the upper cover product is in a solidification stage in the cavity, the piston rod of the oil cylinder upwards extrudes the upper cover product. Extra pressure is applied to an upper cover product through the oil cylinder piston rod in the solidification stage, the density of the product is greatly improved, and the problem of shrinkage cavity which is difficult to avoid in a traditional die-casting process is effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of die casting mould, and particularly relates to a local pressure die casting mould of upper cover. BACKGROUND

[0002] In the die casting process, especially when manufacturing thicker products, due to the volume shrinkage during the cooling and solidification process of the casting liquid, shrinkage cavity or porosity and other defects are easily formed in the product. These defects not only affect the appearance quality of the product, but more importantly, they reduce the mechanical properties and durability of the product, thereby limiting its application range and service life. SUMMARY

[0003] The utility model provides a local pressure die casting mould of upper cover which can solve the problem of product shrinkage.

[0004] The utility model can be implemented by the following technical solutions:

[0005] A local pressure die casting mould of upper cover comprises:

[0006] An upper die and a lower die, each having an upper die core and a lower die core, wherein the upper die core and the lower die core form a cavity for forming the shape of the upper cover product after the upper die and the lower die are closed;

[0007] The lower die core is provided with a through hole, and the through hole is in communication with the cavity;

[0008] An oil cylinder is arranged in the lower die and located at the bottom of the lower die core, and the piston rod of the oil cylinder is upwardly inserted into the through hole, so that the piston rod of the oil cylinder extrudes the upper cover product upwardly when the upper cover product is in the solidification stage in the cavity.

[0009] As a further improvement of the utility model, a sleeve is installed in the through hole, and the piston rod of the oil cylinder is inserted into the sleeve.

[0010] As a further improvement of the utility model, when the piston rod of the oil cylinder is not upwardly inserted, a distance is left between the insertion end of the piston rod and the top end of the sleeve to form a containing groove, and the containing groove is in communication with the cavity.

[0011] As a further improvement of the utility model, when the upper cover product is in the solidification stage in the cavity, the containing groove is filled with material, and as the piston rod of the oil cylinder is upwardly inserted, the piston rod extrudes the material in the containing groove into the cavity.

[0012] As a further improvement of the utility model, the lower mold core is provided with a plurality of slag ladle grooves and exhaust passages, the slag ladle grooves are arranged around the outer periphery of the cavity, and the exhaust passages are in one-to-one correspondence with the slag ladle grooves.

[0013] As a further improvement of the utility model, the upper mold and the side part of the lower mold are further provided with exhaust plates, part of the exhaust passages are communicated with the exhaust plates, and part of the exhaust passages are separately extended outward and exhaust.

[0014] As a further improvement of the utility model, the upper mold plate is provided with a feeding port.

[0015] As a further improvement of the utility model, the lower mold plate is provided with a feeding guide sleeve, and the feeding port and the feeding guide sleeve are arranged in an up-down mode.

[0016] As a further improvement of the utility model, the lower mold core has a feeding passage, the feeding guide sleeve is arranged at the inlet end of the feeding passage, and the feeding passage is communicated with the cavity.

[0017] Compared with the prior art, the utility model has the beneficial effects that:

[0018] 1. The product density is improved: through the additional pressure applied by the oil cylinder piston rod on the upper cover product in the solidification stage, the material in the containing groove is used to supplement the cavity, so that the product density is greatly improved, and the shrinkage hole problem that is difficult to avoid in the traditional die casting process is effectively solved.

[0019] 2. The surface quality is improved: the reasonable exhaust system design, including the application of slag ladle grooves, exhaust passages and exhaust plates, not only helps to remove the gas and impurities generated in the casting process, but also significantly improves the surface finish of the product.

[0020] 3. The mechanical performance is enhanced: due to the more compact internal organization of the product, the mechanical performance of the product is obviously enhanced, which is particularly important for application occasions that need to bear high stress. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structure schematic view of the die casting mold of the utility model;

[0022] Figure 2 is a structure schematic view of the lower mold of the utility model;

[0023] Figure 3 is a structure schematic view of the upper mold of the utility model;

[0024] Figure 4 is a sectional view of the die casting mold of the utility model;

[0025] Figure 5 is aFigure 4 A magnified view of a portion of point A in the middle.

[0026] In the diagram, 100 is the upper mold; 110 is the upper mold core; and 120 is the feed inlet.

[0027] 200, Lower mold; 210, Lower mold core; 220, Cavity; 230, Insert sleeve; 231, Receiving groove; 240, Slag pocket groove; 250, Venting channel; 260, Venting plate; 270, Feed guide sleeve; 280, Feeding channel;

[0028] 300, hydraulic cylinder; 310, piston rod. Detailed Implementation

[0029] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. The technical methods of the present invention will be further described, but the present invention is not limited to these embodiments.

[0030] like Figures 1-5 As shown, this utility model provides a die-casting mold for partial pressure application of the upper cover, comprising:

[0031] The upper mold 100 and the lower mold 200 each have an upper mold core 110 and a lower mold core 210 respectively. After the upper mold 100 and the lower mold 200 are closed, the upper mold core 110 and the lower mold core 210 form a cavity 220 for forming the shape of the upper cover product.

[0032] The lower mold core 210 has a through hole that is connected to the cavity 220.

[0033] The hydraulic cylinder 300 is installed in the lower mold 200 and located at the bottom of the lower mold core 210. The piston rod 310 of the hydraulic cylinder 300 pushes upward into the through hole.

[0034] Specifically, when the top cover product is in the solidification stage in the cavity 220, the piston rod 310 of the oil cylinder 300 presses the top cover product upward, increasing the local pressure, so that the casting liquid fills the cavity 220 more tightly, effectively solving the shrinkage problem that is difficult to avoid in the traditional die casting process.

[0035] Preferably, a sleeve 230 is installed in the through hole, and the sleeve 230 is sealed to the through hole. The piston rod 310 of the oil cylinder 300 is inserted into the sleeve 230. The sleeve 230 ensures that the piston rod 310 can move smoothly and will not affect the material flow in the cavity 220 when no pressurization operation is performed.

[0036] It is worth mentioning that when the piston rod 310 of the oil cylinder 300 is not pushed upward, there is a distance between the insertion end of the piston rod 310 and the top of the sleeve 230, forming a receiving groove 231. The receiving groove 231 is connected to the cavity 220, that is, after the casting liquid enters the cavity 220, it will simultaneously fill the receiving groove 231.

[0037] When the casting liquid is in the solidification stage, the piston rod 310 can extrude the material in the accommodating groove 231 into the cavity 220 to further fill the cavity 220, so that the product is more compact, thereby eliminating the shrinkage hole problem of the product.

[0038] Preferably, considering that the gas and impurities generated in the casting process can affect the product quality, a plurality of slag pocket grooves 240 and exhaust passages 250 are arranged around the lower mold core 210, the slag pocket grooves 240 are arranged around the cavity 220, and each slag pocket groove 240 is connected through a corresponding exhaust passage 250, effectively collecting impurities and exhausting excess air in the casting process, and ensuring the quality of the casting.

[0039] In addition, the upper mold 100 and the lower mold 200 are specially designed with exhaust plates 260, part of the exhaust passages 250 are connected with the exhaust plates 260, and the others directly extend outward to exhaust, which optimizes the exhaust path, improves the exhaust efficiency, and reduces product defects caused by poor exhaust.

[0040] Through the arrangement of the plurality of exhaust passages 250 and the exhaust plates 260, not only the gas and impurities generated in the casting process can be removed, but also the surface finish of the product can be significantly improved.

[0041] Preferably, the upper mold 100 is provided with a feeding port 120, and the lower mold 200 is provided with a feeding guide sleeve 270, which are arranged in a corresponding manner.

[0042] The lower mold core 210 has a feeding passage 280, and the feeding guide sleeve 270 is arranged at the inlet end of the feeding passage 280, and the feeding passage 280 is connected with the cavity 220, so that after the casting liquid enters the feeding port 120, it can smoothly flow into the cavity 220 along the feeding passage 280.

[0043] The technical means disclosed in the utility model scheme is not limited to the technical means disclosed in the above technical means, and also includes the technical scheme composed of any combination of the above technical features. The above is the specific implementation manner of the utility model, and it should be pointed out that for ordinary skilled persons in the art, without departing from the principle of the utility model, some improvements and decorations can be made, and these improvements and decorations are also regarded as the protection range of the utility model.

[0044] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition and the like between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0045] In addition, the description such as "one", "a" and "said" in the present application is only for describing purpose, and cannot be understood as indicating or implying the relative importance of the technical features or implying the number of the technical features. Therefore, the features defined by "one", "a" or "said" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0046] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixing" and the like should be understood in a broad sense, for example, "fixing" can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

Claims

1. An upper cover partial pressurization die-casting mold characterized by comprising: The utility model relates to a kind of upper die and lower die, and two upper die and lower die have upper die core and lower die core respectively, after the upper die and the lower die are closed, the upper die core and the lower die core are enclosed to form the cavity for forming the shape of upper cover product; The lower die core is provided with a through hole, and the through hole is communicated with the cavity; Oil cylinder is arranged in the lower die and located at the bottom of the lower die core, the piston rod of the oil cylinder is inserted into the through hole upward, when the upper cover product is in the solidification stage in the cavity, the piston rod of the oil cylinder extrudes the upper cover product upward. The through hole is provided with an insert sleeve, and the piston rod of the oil cylinder is inserted into the insert sleeve.

2. The partially pressurized die casting mold for an upper cover according to claim 1, characterized by, When the piston rod of the oil cylinder is not lifted upward, there is a distance between the insertion end of the piston rod and the top end of the insert sleeve, and a containing groove is formed, and the containing groove is communicated with the cavity.

3. The partially pressurized die-casting mold for an upper cover according to claim 2, characterized by When the upper cover product is in the solidification stage in the cavity, the containing groove is filled with material, and as the piston rod of the oil cylinder is lifted upward, the piston rod extrudes the material in the containing groove into the cavity.

4. The partially pressurized die-casting mold for an upper cover according to claim 3, characterized by The lower die core is provided with a plurality of slag pockets and exhaust passages, the slag pockets are arranged around the outer periphery of the cavity, and the exhaust passages are communicated with the slag pockets one by one.

5. The partially pressurized die-casting mold of claim 1, wherein The side of the upper die and the lower die is also provided with an exhaust plate, part of the exhaust passages are communicated with the exhaust plate, and part of the exhaust passages are individually extended outward and exhaust.

6. A partial pressure die casting mold for an upper cover according to claim 5, wherein The upper die plate is provided with a feeding port.

7. The partially pressurized die-casting mold of claim 1, wherein The lower die plate is provided with a feeding guide sleeve, and the feeding port and the feeding guide sleeve are arranged vertically.

8. The partially pressurized die-casting mold of an upper cover according to claim 7, characterized by, The lower die core has a feeding passage, the feeding guide sleeve is arranged at the inlet end of the feeding passage, and the feeding passage is communicated with the cavity.

9. An upper cover partial press-in die according to claim 8, characterized by ​

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