A casting mold
By designing crankshaft casting molds with vertical molding lines of equal cross-sectional area and specific structures, the problem of large pieces of undesirable substances entering the mold cavity in molten iron was solved, thereby improving the quality of castings and reducing costs, and adapting to the efficient manufacturing of modern cast iron parts.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHAOGUAN JINBAO FOUNDRY CO LTD
- Filing Date
- 2023-10-27
- Publication Date
- 2026-05-15
AI Technical Summary
Large, defective molten iron particles entering the mold cavity in existing casting molds cause sand holes and slag holes in the castings, increasing production costs and reducing product quality.
Design a crankshaft casting mold with equal cross-sectional area along the vertical molding line, comprising a first, second, and third part connected sequentially along the casting direction, wherein the width of the flow channel varies according to a specific rule, and an inlet with an equal projected area is provided to collect and block impurities to ensure the quality of molten iron.
It effectively prevents large defective materials from entering the mold cavity, reduces sand and slag defects, improves casting quality, reduces production costs, and meets the high-flow-rate, low-speed filling requirements of high-speed molding lines.
Smart Images
Figure CN117444141B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of casting mold technology, and more particularly to a crankshaft casting mold with equal cross-sectional area for vertical molding lines. Background Technology
[0002] Modern small cast iron parts are designed for lightweight construction, requiring high strength. High-speed automated production equipment is widely used; the DISA line has a production speed of 550 molds per hour. The sand mold filling time is short, with high flow rate and velocity, placing high demands on the molding sand. Improving the performance of the molding sand requires more material. This also increases the difficulty of cleaning the castings, which is detrimental to the company's green development strategy.
[0003] Intense market competition necessitates high manufacturing quality and reduced quality losses. The overall trend in cast iron production is the use of a process combining synthetic scrap steel, carbon raisers, and recycled iron to manufacture synthetic cast iron. This process results in superior overall mechanical properties compared to cast iron made from traditional pig iron and scrap steel. With the widespread use of synthetic cast iron, the demand for scrap steel has increased significantly. High-quality scrap steel commands high prices and production costs, leading to a surge in demand for ordinary scrap steel. However, ordinary scrap steel suffers from defects such as rust, surface dirt and paint, and a wide variety of chemical compositions. After melting, it produces a lot of slag in the molten iron. Although high-quality slag removers can largely remove it, the rapid pace of production makes it difficult to completely clean the slag from the molten iron before it enters the casting process. Summary of the Invention
[0004] This invention provides a crankshaft casting mold with a vertical molding line of equal cross-sectional area to solve the problem of large pieces of molten iron entering the mold cavity in the above-mentioned casting mold, causing sand holes and slag holes in the casting.
[0005] To solve the above-mentioned technical problems, the present invention is implemented as follows:
[0006] This invention provides a crankshaft casting mold with a vertical molding line of equal cross-sectional area, comprising: a first part, a second part, and a third part connected sequentially along the casting direction; the first part having a first runner with a width gradually decreasing along the casting direction; the second part having a second runner connected to the first runner; and the third part having a third runner with a width that gradually increases along the casting direction near the second runner.
[0007] The first flow channel has a first inlet area at its beginning end, the second flow channel has a second inlet area, the width of the second inlet area gradually increases along the pouring direction, and the third flow channel has a third inlet area at its end. A reference surface is made parallel to the pouring direction and the width direction, and the projected areas of the first inlet area, the second inlet area and the third inlet area on the reference surface are equal.
[0008] The present invention is further configured such that the maximum width of the first flow channel is greater than the maximum width of the third flow channel.
[0009] The present invention is further configured such that: the crankshaft casting mold with equal cross-sectional area of the vertical molding line has a height direction, the height direction being perpendicular to the casting direction and the width direction, and the height of the first inlet area in the height direction is 3mm to 5mm.
[0010] The present invention is further configured such that, in the width direction, the width of the first entrance area is 40mm to 60mm.
[0011] The present invention is further configured such that: the crankshaft casting mold with equal cross-sectional area of the vertical molding line has a height direction, the height direction being perpendicular to the casting direction and the width direction, and the height of the third inlet area being 5mm to 7mm in the height direction.
[0012] The invention is further configured such that: the shape of the second entrance area is an isosceles trapezoid, and the bottom width of the isosceles trapezoid is twice the top width.
[0013] The present invention is further configured such that the minimum width of the first flow channel, the width of the second flow channel, and the minimum width of the third flow channel are equal.
[0014] The invention is further configured such that: the crankshaft casting mold with equal cross-sectional area along the vertical molding line has a height direction, the height direction being perpendicular to the casting direction and the width direction; wherein, the first part has a first inlet and a first main body that are interconnected, the first main body and the second part are interconnected, the height of the first inlet is equal in the casting direction, and the height of the first main body gradually increases; the height of the second part is equal in the casting direction; the third part includes a third main body and a third outlet that are interconnected, the third main body is interconnected with the second part, the height of the third main body gradually decreases in the casting direction, and the height of the third outlet is equal.
[0015] The present invention is further configured such that the height of the second part, the maximum height of the first main body part, and the maximum height of the third main body part are equal.
[0016] The present invention is further configured such that, in the pouring direction, the length of the second part is greater than the length of the first part and also greater than the length of the second part.
[0017] In summary, the beneficial effects of the present invention are as follows:
[0018] Compared with the prior art, in this embodiment of the invention, the crankshaft casting mold with equal cross-sectional area along the vertical molding line is an overall variable-speed ingate mold with equal cross-sectional area along the vertical molding line. The structure of the first flow channel can block large pieces of slag, and the structure of the second inlet area of the second flow channel can effectively collect fine slag, fine sand and other impurities. Moreover, by setting the first inlet area, the second inlet area and the third inlet area to have equal projected surface areas on the reference plane, the cross-sectional area of the inlet flow channel of the crankshaft casting mold with equal cross-sectional area along the vertical molding line changes, resulting in less temperature loss, easier removal of slag from the molten iron, and guaranteed casting quality. The crankshaft casting mold with equal cross-sectional area along the vertical molding line can adapt to the high flow rate and low speed of molten iron filling in high-speed molding lines, reducing sand holes and slag holes, ensuring casting quality, reducing quality loss, and collecting large pieces of defective molten iron in the gating system to prevent them from entering the mold cavity and causing sand holes and slag holes in the casting. This can achieve the purpose of reducing production costs and improving product quality. Attached Figure Description
[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:
[0020] Figure 1 This is a front view of a crankshaft casting mold with equal cross-sectional area along a vertical molding line, according to an embodiment of the present invention.
[0021] Figure 2 This is a partial internal structural cross-sectional view of a crankshaft casting mold with a vertical molding line of equal cross-sectional area, according to an embodiment of the present invention.
[0022] Figure 3 This is a schematic diagram of a crankshaft casting mold with equal cross-sectional area along a vertical molding line, as described in an embodiment of the present invention.
[0023] In the diagram: 100, crankshaft casting mold with cross-sectional area equal to the vertical molding line; 10, first part; 101, first entrance area; 11, first inlet section; 12, first main body section; 20, second part; 201, second entrance area; 30, third part; 301, third entrance area; 31, third main body section; 32, third outlet section; 401, horizontal sprue; 402, mold; 403, riser; 404, sprue. Detailed Implementation
[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0025] Please see Figures 1 to 3 This invention provides a crankshaft casting mold 100 with a vertical molding line of equal cross-sectional area.
[0026] like Figure 1 and Figure 2 As shown, this embodiment of the invention provides a crankshaft casting mold 100 with a vertical molding line of equal cross-sectional area, comprising: a first part 10, a second part 20, and a third part 30 connected sequentially along the casting direction. The first part 10 has a first runner, the width of which gradually decreases along the casting direction. The second part 20 has a second runner connected to the first runner. The third part 30 has a third runner, the width of which gradually increases along the casting direction at the portion near the second runner.
[0027] The first flow channel has a first inlet area 101 at its beginning, the second flow channel has a second inlet area 201, the width of the second inlet area 201 gradually increases along the pouring direction, and the third flow channel has a third inlet area 301 at its end. A reference surface is made parallel to the pouring direction and the width direction. The projected areas of the first inlet area 101, the second inlet area 201 and the third inlet area 301 on the reference surface are equal.
[0028] refer to Figure 2 The pouring direction can refer to Figure 2 The width direction from right to left can refer to... Figure 2 Up and down direction.
[0029] refer to Figure 3 After the molten iron fills the horizontal sprue 401, it enters the sprue 404 of each mold 402, and then enters the riser 403 of each mold 402 through the crankshaft casting mold 100 with a cross-sectional area equal to the vertical molding line, thus filling the mold and finally forming the product. After passing through the slender first inlet region 101 (the cross-section of the first inlet region 101 can be a cuboid) in the first runner, the temperature of the molten iron drops slightly. In the longer trapezoidal runner of the second runner, the temperature remains basically constant, ensuring that the slag floats sufficiently. The molten iron enters the riser 403 through the third runner, where the temperature drops slightly again.
[0030] In the above technical solution, the crankshaft casting mold 100 with equal cross-sectional area along the vertical molding line is an overall variable-speed ingate mold with equal cross-sectional area along the vertical molding line. The structure of the first flow channel can block large pieces of slag, while the structure of the second inlet area 201 of the second flow channel can effectively collect fine slag, fine sand, and other impurities. Moreover, by setting the first inlet area 101, the second inlet area 201, and the third inlet area 301 to have equal projected surface areas on the reference plane, the cross-sectional area of the inner flow channel of the crankshaft casting mold 100 with equal cross-sectional area along the vertical molding line changes, resulting in less temperature loss, easier removal of slag from the molten iron, and guaranteed casting quality. The crankshaft casting mold 100 with equal cross-sectional area along the vertical molding line can adapt to the high flow rate and low speed of molten iron filling in high-speed molding lines, reducing sand holes and slag holes, ensuring casting quality, and reducing quality loss. It can collect large pieces of defects in the molten iron in the gating system to prevent them from entering the mold cavity and causing sand holes and slag holes in the casting, thereby achieving the goal of reducing production costs and improving product quality.
[0031] The present invention is further configured as follows: Figure 2 As shown, the maximum width of the first flow channel is greater than the maximum width of the third flow channel. This method ensures that the first inlet region 101 of the first flow channel is elongated.
[0032] The present invention is further configured such that: the crankshaft casting mold 100 with a cross-sectional area equal to that of the vertical molding line has a height direction, the height direction being perpendicular to the casting direction and the width direction, and the height of the first inlet area 101 in the height direction is 3mm to 5mm.
[0033] refer to Figure 1 and Figure 2 The height direction can refer to Figure 1 In the vertical direction, the first inlet area 101 in this technical solution can be understood as the water inlet of the first flow channel. By setting the height of the water inlet to 3mm to 5mm, large pieces of slag in the horizontal and vertical pouring channels can be blocked and prevented from entering the first flow channel. Generally, 4mm can be used.
[0034] The present invention is further configured such that, in the width direction, the width of the first inlet region 101 is 40mm to 60mm. The length of the first inlet region 101 is mainly determined according to the casting weight of each machine model.
[0035] The present invention is further configured as follows: Figure 1 and Figure 2As shown, the crankshaft casting mold 100 with a vertical molding line and equal cross-sectional area has a height direction, which is perpendicular to the casting direction and the width direction. In the height direction, the height of the third inlet region 301 is 5mm to 7mm. In this technical solution, the height of the third inlet region 301 is 5mm to 7mm, mainly to reduce the energy loss of molten iron in the flow channel. That is, the lower the height and the longer the length, the smaller the static pressure on the riser, and the less pressure casting can be formed. Generally, 6mm can be used.
[0036] The present invention is further configured as follows: Figure 2 As shown, the second inlet area 201 is an isosceles trapezoid, with the base width being twice the top width. In this technical solution, the height of the isosceles trapezoid can also be twice the top width. In this technical solution, the second inlet area 201 forms a special trapezoid with a modulus of 0.43a, which is larger than that of the first inlet area 101 and the third inlet area 301. Modulus = surface area / volume of the casting. Because this trapezoidal flow channel has the highest modulus for the same cross-sectional area, its temperature loss is minimal. Furthermore, the slag in the molten iron has a lower density than the molten iron, causing the molten iron to continuously rise during the flow process and adhere to the surface of the inner runner sand mold, resulting in secondary purification of the molten iron in this area.
[0037] The present invention is further configured as follows: Figure 2 As shown, the minimum widths of the first, second, and third runners are equal. This ensures smooth flow of molten iron within the first, second, and third runners, which is beneficial for casting.
[0038] The present invention is further configured as follows: Figure 1 As shown, the crankshaft casting mold 100 with a cross-sectional area of equal vertical molding lines has a height direction, which is perpendicular to the casting direction and the width direction. The first part 10 has a first inlet 11 and a first main body 12 that are interconnected. The first main body 12 is connected to the second part 20. In the casting direction, the height of the first inlet 11 is equal, and the height of the first main body 12 gradually increases. In the casting direction, the height of the second part 20 is equal. The third part 30 includes a third main body 31 and a third outlet 32 that are interconnected. The third main body 31 is connected to the second part 20. In the casting direction, the height of the third main body 31 gradually decreases, and the height of the third outlet 32 is equal.
[0039] The height direction can refer to Figure 1 In the top and bottom direction. By adopting the above technical solution, the first flow channel in the first part 10 can be designed with a variable cross-section, and the third flow channel in the third part 30 can also be designed with a variable cross-section. This is beneficial to further reduce the temperature loss of molten iron, make it easier to remove slag from the molten iron, and ensure the quality of the casting.
[0040] The present invention is further configured as follows: Figure 1 As shown, the height of the second part 20, the maximum height of the first main body 12, and the maximum height of the third main body 31 are equal. This method allows for a smoother transition between the first part 10, the second part 20, and the third part 30 in the crankshaft casting mold 100 with equal cross-sectional areas along the vertical molding lines, thus improving the user experience.
[0041] The present invention is further configured as follows: Figure 2 As shown, in the pouring direction, the length of the second part 20 is greater than the length of the first part 10, and also greater than the length of the second part 20. By increasing the length of the second part 20, the ability to collect fine slag, fine sand, and other impurities can be further improved.
[0042] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.
Claims
1. A crankshaft casting mold with equal cross-sectional area along vertical molding lines, characterized in that, include: The system comprises a first part, a second part, and a third part connected sequentially along the pouring direction. The first part contains a first flow channel, the width of which gradually decreases along the pouring direction. The second part contains a second flow channel connected to the first flow channel. The third part contains a third flow channel, the width of which gradually increases along the pouring direction at the portion closest to the second flow channel. The first flow channel has a first inlet area at its beginning end, the second flow channel has a second inlet area, the width of the second inlet area gradually increases along the pouring direction, and the third flow channel has a third inlet area at its end. A reference surface is made parallel to the pouring direction and the width direction. The projected areas of the first inlet area, the second inlet area and the third inlet area on the reference surface are equal. The second entrance area is in the shape of an isosceles trapezoid, and the width of the base of the isosceles trapezoid is twice the width of the top. The crankshaft casting mold with a vertical molding line and equal cross-sectional area has a height direction, which is perpendicular to the casting direction and the width direction; wherein... The first part has a first inlet and a first main body that are interconnected. The first main body and the second part are connected. In the pouring direction, the height of the first inlet is equal and the height of the first main body gradually increases. In the pouring direction, the heights of the second portions are equal; The third part includes a third main body and a third outlet that are interconnected. The third main body is connected to the second part. In the pouring direction, the height of the third main body gradually decreases, while the height of the third outlet remains constant.
2. The crankshaft casting mold with equal cross-sectional area along the vertical molding line according to claim 1, characterized in that, The maximum width of the first flow channel is greater than the maximum width of the third flow channel.
3. A crankshaft casting mold with equal cross-sectional area along vertical molding lines according to claim 1, characterized in that, The crankshaft casting mold with equal cross-sectional area of vertical molding lines has a height direction, which is perpendicular to the casting direction and the width direction. In the height direction, the height of the first inlet area is 3mm to 5mm.
4. A crankshaft casting mold with equal cross-sectional area along vertical molding lines according to claim 3, characterized in that, In the width direction, the width of the first entrance area is 40mm to 60mm.
5. A crankshaft casting mold with equal cross-sectional area along vertical molding lines according to claim 1, characterized in that, The crankshaft casting mold with equal cross-sectional area of vertical molding line has a height direction, which is perpendicular to the casting direction and the width direction. In the height direction, the height of the third inlet area is 5mm to 7mm.
6. A crankshaft casting mold with equal cross-sectional area along vertical molding lines according to claim 1, characterized in that, The height of the second part, the maximum height of the first main body part, and the maximum height of the third main body part are equal.
7. A crankshaft casting mold with equal cross-sectional area along vertical molding lines according to claim 1, characterized in that, In the pouring direction, the length of the second part is greater than the length of the first part.