Aluminum end cover gating system for riser-free casting

Abstract

The utility model provides a riser-free casting aluminum end cover gating system which comprises a cavity and a sprue arranged below the cavity, the sprue is communicated with a cross gate, the cross gate is of a heat storage steady flow type, and the cross gate is communicated with the cavity through an inner gate; the top and the bottom of the cavity are both provided with chilling blocks, all riser design is canceled, the chilling blocks are arranged, a cross gate is designed into a heat storage mode, the flow gate is designed according to an end effect method, and the thickness and layout of the chilling blocks are designed according to mature experience, so that inner feeding of the flow gate is realized; and the casting of the end cover is always in a stable and qualified state.

Description

Technical Field

[0001] The utility model relates to the field of casting, in particular to a pouring system for an aluminum end cover without a riser casting. Background Art

[0002] The shape of the aluminum end cap is relatively simple, and most of them are a flat structure, but it is difficult to cast large aluminum end caps without defects. The current common casting method is to use sand mold low-pressure casting or differential pressure casting, set a large number of risers on the end cap, and use cold iron to solidify under pressure to obtain qualified castings. However, this method has several shortcomings: First, due to the use of a large number of risers, the process yield is low, and the molten metal generally enters the product first and then enters the riser. The riser on the end cap is a "cold" riser, and this type of riser design is relatively large; second, due to the slow cooling speed in the nearby area, the grains in the local area of ​​the product are coarse, which reduces the mechanical properties of the product. Third, if the riser is designed to be too large and the cooling is too slow, defects such as pinholes may appear at its root. Utility Model Content

[0003] The technical problem to be solved by the utility model is that currently the casting of aluminum end caps is prone to casting defects. The utility model provides a pouring system for aluminum end caps without risers to solve the above problem.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a pouring system for aluminum end cover casting without a riser, including a cavity and a straight runner arranged below the cavity, a cross runner is connected to the straight runner, the cross runner is a heat storage steady flow type, and the cross runner is connected to the cavity through an inner gate; cold irons are arranged on the top and bottom of the cavity.

[0005] Furthermore, the value of the diameter of the sprue: the height of the sprue is 1:1-1.2.

[0006] Furthermore: the number of the cross runners is four, and the sum of the cross-sectional areas of the four cross runners: the cross-sectional area of ​​the straight runner is ≥2:1.

[0007] Furthermore: the ingates are in the form of necking risers; the necking width of the ingates: the necking height of the ingates = 1:1-1.2; the width of the ingates: the height of the ingates = 1:1-1.5; the necking width of the ingates: the length of the ingates ≤1:3; the distance between adjacent ingates: the wall thickness of the casting corresponding to the cavity ≤1:6.

[0008] Furthermore: the cavity has a stopper portion and a bearing chamber portion, the inner gate connected to the stopper portion is a first inner gate, the inner gate connected to the bearing chamber portion is a second inner gate, and the second inner gate extends to the bottom of the groove of the bearing chamber portion.

[0009] Furthermore, the gap between two adjacent chills is 1-2 times the thickness of the chill, and chills are evenly distributed between the inner gates.

[0010] Furthermore: the material of the chill is aluminum or iron. When the material of the chill is aluminum, the thickness of the chill is 1-1.5 times the wall thickness of the casting at the chilling location; when the material of the chill is iron, the thickness of the chill is 1 / 2-2 / 3 of the wall thickness of the casting at the chilling location.

[0011] The beneficial effect of the utility model is that the present application is a riserless casting system for aluminum end cover, which eliminates all riser designs, arranges chillers, designs the cross runner into a heat storage mode, designs the inner gate according to the "end effect" method, and designs the chiller thickness and layout based on mature experience, thereby achieving internal shrinkage compensation of the inner gate, so that the casting of the end cover is always in a stable and qualified state. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0013] Figure 1 It is a structural cross-sectional schematic diagram of a pouring system for aluminum end cap without a riser casting of the utility model;

[0014] Figure 2 yes Figure 1 Bottom view of

[0015] Figure 3 yes Figure 1 Middle AA section view.

[0016] In the figure, 1 is the cavity, 2 is the sprue, 3 is the runner, 4 is the chiller, 5 is the stopper, 6 is the bearing chamber, 7 is the first ingates, and 8 is the second ingates. DETAILED DESCRIPTION

[0017] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. On the contrary, the embodiments of the present invention include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0018] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0019] In addition, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0020] Any process or method description in the flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0021] like Figures 1 to 3 As shown, the utility model provides a pouring system for aluminum end cover casting without a riser, comprising a cavity 1 and a sprue 2 arranged below the cavity 1, a cross runner 3 is connected to the sprue 2, and the cross runner 3 is a heat storage steady flow type, and the cross runner 3 is connected to the cavity 1 through an inner gate; chillers 4 are provided at the top and bottom of the cavity 1.

[0022] By designing the runner 3 as a heat storage and steady flow type, designing the inner gate according to the "end effect" method, and designing the thickness and layout of the chiller 4 based on mature experience, the casting of the end cover is always in a stable and qualified state.

[0023] The diameter of the sprue 2: the height of the sprue 2 is 1:1-1.2. The number of the runners 3 is four, and the sum of the cross-sectional areas of the four runners 3: the cross-sectional area of ​​the sprue 2 is ≥2:1. In the present application, the outline size of the aluminum end cover is 1300*1000*150, and the weight of the end cover is about 100Kg; the stopper of the aluminum end cover is 40mm wide and 80mm high, the thickness of the flange edge of the aluminum end cover is 33mm, the lower end width of the aluminum end cover bearing chamber is 35mm, and the total height of the bearing chamber is 120mm. In the present application, the sprue 2 is Ф100*100mm, and the runner 3 is designed as a heat storage mode. The shape follows the product, and it is connected to the sprue 2 through four runners 3 to ensure that the molten metal flows smoothly into the runner 3 and reduce the secondary oxidation of the molten metal.

[0024] At the same time, in order to reduce the excessive cooling of the molten metal during the flow process, the molten metal in the runner 3 cannot be designed to be too little. In the utility model, the cross-sectional size of the runner 3 is 70*80mm, and the weight of the runner 3 is about 80% of the weight of the product. The length of the end of the runner 3 is approximately equal to the width of the runner 3. When the molten metal flows into the runner 3, the end of the runner 3 is filled first, which is conducive to retaining the slag or cold molten metal in the runner 3.

[0025] The ingates are in the form of necking risers; the necking width of the ingates: the necking height of the ingates = 1:1-1.2; the width of the ingates: the height of the ingates = 1:1-1.5; the necking width of the ingates: the length of the ingates ≤1:3; the distance between adjacent ingates: the wall thickness of the casting corresponding to the cavity 1 ≤1:6.

[0026] The cavity 1 has a stop portion 5 and a bearing chamber portion 6, the ingates connected to the stop portion 5 are first ingates 7, the ingates connected to the bearing chamber portion 6 are second ingates 8, and the second ingates 8 extend to the bottom of the groove of the bearing chamber portion 6.

[0027] In the present application, the stop connected to the first inner gate 7 is 40mm wide and 80mm high ≤ 1:3, so no subsidy is required; the lower end of the bearing chamber corresponding to the second inner gate 8 is 35mm wide and the total height of the bearing chamber is 120mm ≥ 1:3, so the inner gate needs to be extended to the step of the bearing chamber.

[0028] The first ingates 7 and the second ingates are designed as necking risers. The size of the ingates can be simply designed according to the end effect. The "end effect" means that the maximum effective distance of the riser shrinkage is less than or equal to three times the wall thickness of the product. In addition to the shrinkage of the riser, the "end effect" is also applicable to the chilling effect of the chill 4. In counter-gravity casting, if the ingates are designed as necking risers, the same is true.

[0029] The gap between two adjacent chillers 4 is 1-2 times the thickness of the chillers 4, and the inner gates are also evenly distributed with chillers 4. In the present application, the gap between the chillers 4 is 30 mm, and the chillers 4 are evenly distributed between the inner gates, with a distance of 10-30 mm from the inner gates, to avoid overheating of the inner gates and ensure the shrinkage compensation effect of the inner gates.

[0030] The material of the chill 4 is aluminum or iron. When the material of the chill 4 is aluminum, the thickness of the chill 4 is 1-1.5 times the wall thickness of the casting at the chilling location; when the material of the chill 4 is iron, the thickness of the chill 4 is 1 / 2-2 / 3 of the wall thickness of the casting at the chilling location.

[0031] There are two options for the design of the chiller 4. The first option is to design the chiller 4 to be made of the same material as aluminum. The thickness of the chiller 4 is designed to be 1.0 to 1.5 times the required chilling wall thickness. The characteristic of the aluminum chiller 4 is fast heat conduction, but the disadvantage is that the chiller 4 must be replaced after 3 to 5 uses at most, otherwise it will not have the proper chilling effect. The reason is that the aluminum chiller 4 is easy to oxidize, and the thermal conductivity of the oxidized aluminum chiller 4 becomes poor.

[0032] The second solution is to design the chiller 4 to be an iron chiller 4. Although the heat conduction speed of the iron chiller 4 is slower than that of the aluminum chiller 4, it can also meet the requirements, and the iron chiller 4 has a large heat storage capacity and can be used repeatedly. The thickness of the iron chiller 4 is designed to be 1 / 2 to 2 / 3 of the required chilling wall thickness. It cannot be too thin. If it is too thin, it will not have the proper chilling effect. If it is too thick, the chilling capacity is too strong, which is not conducive to the filling of the cavity 1, shrinkage compensation and the generation of new heat nodes.

[0033] In the present application, the thickness of the flange 1-2 is 33mm. If only the thickness of the flange is calculated, the thickness of the iron cold iron 4 should be 17~22mm, but there are many bosses on the flange, and the boss height is 15mm. If the height of the boss is added, the thickness of the iron cold iron 4 should be 24~32mm. Therefore, the thickness of the iron cold iron 4 in the present utility model is 25mm. The material is ordinary steel plate. The contour follows the shape, and the length is ≤150mm. The cold iron 4 cannot be designed to be too large. If it is designed to be too large, it is not conducive to the fixation of the cold iron 4, nor is it conducive to the exhaust of the cavity 1. At the same time, the cold iron 4 is easy to deform. If the cold iron 4 is too large, it is easy to produce defects such as pores, cold shuts, and cold beans.

[0034] During mass production, there are very few scrapped aluminum end caps, and the process remains very stable.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A pouring system for aluminum end cap casting without a riser, comprising a mold cavity (1) and a sprue (2) arranged below the mold cavity (1), characterized in that: The sprue (2) is connected to a runner (3), the runner (3) is of a heat storage steady flow type, and the runner (3) is connected to the cavity (1) via an inner gate; the top and bottom of the cavity (1) are both provided with chillers (4).

2. The pouring system for aluminum end cap without riser casting as claimed in claim 1, characterized in that: The value of the diameter of the sprue (2) and the height of the sprue (2) is 1:1-1.

2.

3. A pouring system for aluminum end cap casting without riser as claimed in claim 2, characterized in that: The number of the cross runners (3) is four, and the sum of the cross-sectional areas of the four cross runners (3): the cross-sectional area of ​​the straight runner (2) is ≥ 2:

1.

4. A pouring system for aluminum end cap casting without riser as claimed in claim 3, characterized in that: The ingates are in the form of necking risers; the necking width of the ingates: the necking height of the ingates = 1:1-1.2; the ingates width: the ingates height = 1:1-1.5; the necking width of the ingates: the ingates length ≤1:3; the distance between adjacent ingates: the wall thickness of the casting at the corresponding cavity (1) ≤1:

6.

5. A pouring system for aluminum end cap casting without riser as claimed in claim 4, characterized in that: The cavity (1) has a stopper portion (5) and a bearing chamber portion (6), the ingate connected to the stopper portion (5) is a first ingate (7), the ingate connected to the bearing chamber portion (6) is a second ingate (8), and the second ingate (8) extends to the bottom of the groove of the bearing chamber portion (6).

6. A pouring system for aluminum end cap casting without riser as claimed in claim 5, characterized in that: The gap distance between two adjacent chillers (4) is 1 to 2 times the thickness of the chillers (4), and the chillers (4) are also evenly distributed between the inner gates.

7. A pouring system for aluminum end cap casting without riser as claimed in claim 6, characterized in that: The material of the cold iron (4) is aluminum or iron. When the material of the cold iron (4) is aluminum, the thickness of the cold iron (4) is 1-1.5 times the wall thickness of the casting at the quenching location; when the material of the cold iron (4) is iron, the thickness of the cold iron (4) is 1 / 2-2 / 3 the wall thickness of the casting at the quenching location.

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