Non-shrinkage vertical line pouring mold for ductile iron hub

Abstract

The utility model discloses a shrinkage-porosity-free vertical line pouring mold for a ductile iron hub, and belongs to the technical field of vertical line pouring molds. Comprising a pouring cup and a casting, a pouring system is arranged below the pouring cup, the pouring cup is connected with the pouring system through a slag-avoiding sheet, the pouring system comprises a vertical runway, and the vertical runway is communicated with the slag-avoiding sheet. The utility model solves the problems that the existing hub product has many processing and drilling positions, the probability that the hole wall is shrunk if the product has shrinkage porosity inside, and the feeding effect of the general process is difficult to meet the shrinkage-free requirement of the product because the product structure is thin outside and thick inside, and a counter bore is formed in the middle; the cavity is formed in the middle of the loam core, an inner riser is formed during molten iron punching, the riser is formed in the center of the two castings, the heat preservation effect is very good, the solidification speed is low, and therefore the feeding effect is greatly improved, and it is guaranteed that the interior of a product is not shrunk.

Description

TECHNICAL FIELD

[0001] The utility model relates to vertical linear pouring mold technical field, concretely is a nodular cast iron material hub no shrinkage vertical linear pouring mold. BACKGROUND

[0002] The hub is an important component of automobile parts, and with the growth of Chinese automobile parts industry, the hub industry gradually develops and becomes strong. The domestic hub is generally produced in the horizontal line, such as KW line, HS line, etc. It is relatively easy to produce. However, with the development of lightweight automobile products, it has become a world trend. The production rate of products produced in the horizontal line is relatively reduced, and the cost of producing the hub in the horizontal line is also increased accordingly. Therefore, the hub is changed from horizontal production to DISA vertical production in the prior art to ensure the production efficiency of the hub.

[0003] However, the existing hub product processing drilling position is multiple, if the product has shrinkage inside, the shrinkage probability of the hole wall is very large, in addition, the product structure is thin outside and thick inside, and there is a counterbore in the middle. The shrinkage effect of general process is difficult to meet the product shrinkage requirement. INVENTION CONTENTS

[0004] The utility model discloses a kind of nodular cast iron material hub no shrinkage vertical linear pouring molds, every two castings are provided with core that separates, so that the number of castings arranged in single cavity doubles, cavity is provided in the core, form inner riser when molten iron is flushed into shape, because riser is formed in the center position of two castings, heat preservation effect is very good, solidification speed is slow, so that greatly improve the shrinkage effect, ensure that product is inside without shrinkage, solve the problem in the prior art.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of nodular cast iron material hub no shrinkage vertical linear pouring molds, including sprue cup and casting, the lower part of the sprue cup is provided with pouring system, the sprue cup is connected with pouring system by avoiding residue sheet, the pouring system includes vertical runway, and vertical runway is communicated with avoiding residue sheet, the both sides of the vertical runway are provided with core, the casting is respectively located at the front end and rear end of core, and the casting is provided with eight.

[0006] Preferably, the avoiding residue sheet includes first avoiding residue sheet, second avoiding residue sheet and third avoiding residue sheet, the first avoiding residue sheet and the second avoiding residue sheet are reversely lapped, and the vertical runway is communicated with the core through the third avoiding residue sheet.

[0007] Preferably, the upper end of the core is provided with exhaust sheet, for exhausting the gas of casting cavity and the gas generated by core heating.

[0008] Preferably, the casting is hub, and the material is nodular cast iron 500-7.

[0009] Preferably, the vertical runway is provided with a lap joint for vertical flow of molten iron to reduce pressure and adjust the up and down molten iron flow.

[0010] Preferably, the core is internally provided with a casting riser formed by a core cavity, located between two adjacent castings, for feeding.

[0011] Compared with the prior art, the utility model has the beneficial effects as follows:

[0012] 1、The vertical linear pouring mold of the nodular iron material wheel hub without shrinkage of the utility model, compared with the prior art, doubles the number of single-type castings, and the production efficiency is greatly improved.

[0013] 2、The vertical linear pouring mold of the nodular iron material wheel hub without shrinkage of the utility model, compared with the prior art, basically has no shrinkage in flaw detection, and there is no risk of processing shrinkage. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is a whole structure schematic view of the utility model;

[0015] Fig. 2 It is a whole rear view structure schematic view of the utility model;

[0016] Fig. 3 It is a whole axonometric structure schematic view of the utility model.

[0017] In the drawing: 1, sprue cup; 2, exhaust fin; 3, first slag-avoiding sheet; 4, second slag-avoiding sheet; 5, vertical runway; 6, third slag-avoiding sheet; 7, casting; 8, core; 9, lap joint; 10, casting riser. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0019] Please refer to Figs. 1-3 , the following technical solutions are provided:

[0020] In the embodiment, the vertical non-shrinkage pouring mold for nodular iron wheel hub comprises a sprue cup 1 and castings 7, and the lower part of the sprue cup 1 is provided with a pouring system, the sprue cup 1 is connected with the pouring system through a slag avoiding sheet, the pouring system comprises a vertical runway 5, the vertical runway 5 is communicated with the slag avoiding sheet, the two sides of the vertical runway 5 are provided with core prints 8, the castings 7 are respectively located at the front end and the rear end of the core prints 8, and eight castings 7 are arranged, and the adjacent two castings 7 are separated by the core prints 8, the sprue cup 1 is used for receiving the molten metal poured from a ladle, and the function is to guide the liquid metal poured from the ladle into the straight sprue, and the vertical runway 5 is used for guiding the flow direction of the molten iron.

[0021] In the embodiment, the slag avoiding sheet comprises a first slag avoiding sheet 3, a second slag avoiding sheet 4 and a third slag avoiding sheet 6, the first slag avoiding sheet 3 is reversely overlapped with the second slag avoiding sheet 4, the vertical runway 5 is communicated with the core print 8 through the third slag avoiding sheet 6, the first slag avoiding sheet 3 filters the slag in the initial molten iron in the mold cavity, the second slag avoiding sheet 4 is reversely overlapped with the first slag avoiding sheet 3, the slag in the molten iron in the mold cavity is further filtered, and the third slag avoiding sheet 6 filters the slag in the vertical runway 5 again.

[0022] The core print 8 is provided with an exhaust sheet 2 at the upper end, which is communicated with the outside, and is used for exhausting the gas in the mold cavity of the casting 7 and the gas generated by the core print 8 due to heating.

[0023] The casting 7 is a wheel hub, and the material is nodular iron 500-7, the raw material of the wheel hub is scrap steel plus recycled material, the molten iron is melted by a medium frequency induction furnace, the composition of the molten iron is that the product brand is QT500, a certain amount of Cu and Sn elements need to be added to ensure that the tensile strength meets the requirements, C: 3.7%-3.8%, Si: 2.4%-2.8%, Mn: 0.2-0.5%, S: <0.015%, P: <0.5%, the alloy element tin is controlled within 0.02-0.05%, and the Cu is controlled within 0.1-0.4%.

[0024] The temperature of the molten iron meets the requirements, the molten iron is poured by using the impingement method, the pouring temperature is greater than 1430, the sand box cooling time is about 50 minutes. The spheroidization rate of the product can be more than 80%, the tensile strength is greater than 500 MPa, and the X-ray flaw detection internal defect shrinkage area is basically 0.

[0025] The vertical runway 5 is provided with an overlap 9, which is used for vertical flow of the molten iron to reduce the pressure and adjust the upper and lower molten iron flow, so that the molten iron of each casting 7 reaches the simultaneous impingement type.

[0026] The core 8 is internally provided with a casting riser 10 formed by a cavity of the core 8, located between two adjacent castings 7, used for feeding, and the core 8 separates the two castings 7 and forms a cavity of the casting riser 10 inside, so that the riser neck is designed at the center of the casting 7, which greatly optimizes the feeding effect of the product and ensures that the casting 7 has no internal shrinkage.

[0027] Working principle: when used, the molten iron enters the pouring system below through the avoiding slag sheet from the sprue cup 1. Each casting cavity is provided with an avoiding slag sheet before the molten iron enters, which ensures the purity of the molten iron. Two castings 7 are separated by the core 8, so that the number of castings 7 arranged in a single cavity is doubled. The core 8 is provided with a cavity in the middle, which forms an internal riser when the molten iron is poured. The riser is formed at the center of the two castings 7, which has very good heat preservation effect and slow solidification speed, thereby greatly improving the feeding effect and ensuring that the product has no internal shrinkage.

[0028] It should be noted that, in the present text, relational terms such as first and second are used merely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variant thereof are intended to cover non-exclusive inclusions, so that a process, method, article, or apparatus that includes a list of elements does not only include those elements, but also includes other elements not explicitly listed, or inherent to such a process, method, article, or apparatus.

[0029] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application.

Claims

1. A ductile iron wheel hub shrinkage-free vertical line pouring mold comprising a sprue cup (1) and a casting (7), characterized in that: The lower part of the pouring cup (1) is provided with a pouring system, the pouring cup (1) is connected with the pouring system through a slag avoiding sheet, the pouring system comprises a vertical runway (5), the vertical runway (5) is communicated with the slag avoiding sheet, both sides of the vertical runway (5) are provided with a loam core (8), the castings (7) are respectively located at the front end and the rear end of the loam core (8), and the castings (7) are provided with eight.

2. The shrinkage-free vertical line pouring mold for a ductile iron material wheel hub according to claim 1, characterized in that: The slag avoiding sheet comprises a first slag avoiding sheet (3), a second slag avoiding sheet (4) and a third slag avoiding sheet (6), the first slag avoiding sheet (3) and the second slag avoiding sheet (4) are reversely overlapped, and the vertical runway (5) is communicated with the loam core (8) through the third slag avoiding sheet (6).

3. The compact-free vertical line pouring mold for a ductile iron material wheel hub according to claim 1, characterized in that: The upper end of the loam core (8) is provided with an exhaust sheet (2) for exhausting the gas in the cavity of the casting (7) and the gas generated by the loam core (8) after being heated.

4. The compact-free vertical line pouring mold for a ductile iron material wheel hub according to claim 1, characterized in that: The casting (7) is a wheel hub, and the material is nodular cast iron 500-7.

5. The compact-free vertical line pouring mold for a ductile iron material wheel hub according to claim 1, characterized in that: The vertical runway (5) is provided with an overlap (9) for vertically flowing molten iron to reduce pressure and adjust the flow of molten iron.

6. The compact-free vertical line pouring mold for a ductile iron material wheel hub according to claim 1, characterized in that: The loam core (8) is provided with a casting riser (10) in the inside, the casting riser (10) is formed by the cavity of the loam core (8) and is located between two adjacent castings (7) for feeding.

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