Iron outfitting piece forming die

Abstract

The utility model provides an iron outfitting piece forming die which comprises an upper die and a lower die, the upper die is assembled above the lower die, the top of the upper die is fixedly connected with a plurality of feeding pipes, a flow guide channel is arranged in the upper die and is spiral, and a cavity is arranged below the upper die. The spiral flow guide channel has the advantages that the centrifugal force of molten metal is increased by 2.3 times, and turbulent flow is effectively restrained; and through the auxiliary feeding pipe, the filling saturation degree of the molten metal in the edge area is increased to 99.5% from 78%. The utility model has the technical effects that the spiral diversion channel is additionally arranged on the parting surface of the upper die and the lower die, the main injection port is positioned in the center of the top of the die, and the original injection ports on two sides are changed into auxiliary injection ports. In the initial material injection stage, 80% of materials are injected into the main material injection port at high speed, and the flow guide channel expands the coverage area. In the later material injection stage, the auxiliary material injection openings in the two sides supplement residual materials, and insufficient far-end filling is eliminated. Compared with traditional linear material injection, the filling time is shortened, and the bubble rate is reduced.

Description

Technical Field

[0001] This utility model relates to the field of ship mold technology, and in particular to a molding die for iron outfitting. Background Technology

[0002] Traditional ship wheel molds use a straight injection channel, with both the main injection port and auxiliary injection port vertically arranged at the top of the mold. This design has the following drawbacks:

[0003] Uneven filling: When molten metal flows directly from the top to the bottom of the cavity, insufficient filling is likely to occur in the far-end areas (such as the edge of the rudder blade);

[0004] Bubble defects: High-speed injection causes turbulence, which entraps gas and forms pores (the bubble rate of traditional molds is >3%).

[0005] Inefficient: Multiple material replenishments are required, and the material injection time for a single piece can be as long as 120-180 seconds.

[0006] Therefore, a molding die for iron outfitting is proposed to solve the above problems. Utility Model Content

[0007] The purpose of this invention is to at least solve one of the aforementioned technical defects.

[0008] Therefore, one objective of this utility model is to provide a molding die for iron outfitting to solve the problems mentioned in the background art and overcome the shortcomings of the existing technology.

[0009] To achieve the above objectives, one embodiment of the present invention provides a molding die for iron outfitting, including an upper die and a lower die. The upper die is closed above the lower die. Several feed pipes are fixedly connected to the top of the upper die. A guide channel is provided inside the upper die, and the guide channel is spiral in shape.

[0010] A cavity is provided at the bottom of the upper mold;

[0011] A punch is fixedly connected to the top of the lower mold, and the punch is adapted to the cavity;

[0012] An auxiliary feed pipe is fixedly connected to the top of the lower die, and the end of the auxiliary feed pipe is connected to the punch.

[0013] Preferably, in any of the above schemes, the diameter of the guide channel gradually decreases along the direction from the feed pipe to the cavity, and the number of spiral turns is not less than 3 turns.

[0014] Using the above technical solution: In response to the problems of low injection efficiency and numerous air bubble defects in existing molds, this invention proposes a novel mold that integrates a spiral guide channel and a two-stage injection structure. By dynamically adjusting the flow path of the molten metal and the injection pressure, it achieves efficient and low-defect rudder casting.

[0015] Spiral guide channel structure:

[0016] A spiral guide channel is opened inside the upper mold. The diameter of the guide channel gradually decreases from the inlet of the feed pipe to Φ30mm at the cavity interface, and the spiral turns 3.5 times (lead 120mm).

[0017] The inner wall of the spiral guide channel is polished and coated with a 0.1mm thick Al2O3-TiC wear-resistant coating.

[0018] Main injection port: The top feed pipe serves as the main injection channel. In the initial stage of injection, 80% of the molten metal (approximately 120 kg) is injected at a flow rate of 3.5 m / s.

[0019] Auxiliary injection port: A root feed pipe with a diameter of Φ20mm is arranged in a ring around the outer periphery of the punch of the lower die. The axis is inclined at a 25° angle to the horizontal plane. In the later stage of injection, the remaining 20% ​​of molten metal (about 30kg) is replenished at a flow rate of 1.2m / s.

[0020] Gradient temperature control system:

[0021] The lower mold has a built-in temperature regulation component, including:

[0022] Heating element: Cr20Ni80 alloy electric heating element, power density 8W / cm², arranged around the root of the punch, raising the mold temperature to 350±10℃ during the preheating stage;

[0023] Cooling water channel: Copper coils are embedded 20mm below the parting surface of the lower mold, and 25℃ circulating water is introduced. Gradient cooling is started after the material is injected (cooling rate ≤15℃ / min).

[0024] Preferably, in any of the above embodiments, a temperature regulating component is embedded inside the lower mold. This temperature regulating component includes a heating pipe and a cooling water channel that are interconnected, with the heating pipe arranged around the root of the punch.

[0025] Preferably, in any of the above solutions, the punch is adapted to the cavity.

[0026] Preferably, the auxiliary feed pipe is horizontally positioned, as described in any of the above schemes.

[0027] Mold preparation:

[0028] The upper and lower molds are closed, the punch is embedded in the cavity, and the parting surface gap is ≤0.05mm;

[0029] Turn on the heating element to bring the mold working temperature to the set value.

[0030] Injection stage:

[0031] Main injection period (0-15 seconds):

[0032] The molten metal is injected at high speed from the top feed pipe 3 and accelerated by the rotation of the spiral guide channel (tangential speed up to 1.8m / s).

[0033] The guide channel directs the molten metal to cover the cavity surface in an umbrella shape;

[0034] Auxiliary injection period (15-25 seconds):

[0035] Four auxiliary feed pipes are opened simultaneously, and molten metal fills the edge area of ​​the rudder blade at an inclined angle;

[0036] The pressure sensor monitors the cavity pressure in real time and closes the injection valve when it reaches 1.2 MPa.

[0037] Solidification and demolding:

[0038] Start the cooling water channel to control the rudder body to solidify gradually from the inside out;

[0039] After the mold is opened, the hydraulic ejector rod (located in the lower mold and not shown in the figure) ejects the casting at a speed of 0.5 m / s.

[0040] Preferably, of any of the above schemes, there are 4-6 auxiliary feed tubes arranged in a ring array around the outer periphery of the punch, and the axis of each auxiliary feed tube is inclined at an angle of 15-30° to the horizontal plane.

[0041] The spiral guide channel increases the centrifugal force of the molten metal by 2.3 times, effectively suppressing turbulence;

[0042] The auxiliary feed pipe increases the saturation of molten metal filling in the edge area from 78% to 99.5%.

[0043] Technical effects: Spiral guide channels are added to the parting surfaces of the upper and lower molds, the main injection port is located at the center of the top of the mold, and the original injection ports on both sides are changed to auxiliary injection ports. Initial injection: 80% of the material is injected at high speed through the main injection port, and the guide channels expand the coverage area.

[0044] Later stage of material injection: The auxiliary injection ports on both sides replenish the remaining material to eliminate insufficient filling at the far end.

[0045] Comparative advantages: Compared with traditional linear injection, the filling time is shortened by 40% and the bubble rate is reduced to below 0.5%.

[0046] Specific Implementation Cases

[0047] Taking the manufacture of a Φ2.5m ship rudder as an example:

[0048] The mold is preheated to 350°C, and the main injection pipe injects molten aluminum bronze at a flow rate of 150 kg / s (pouring temperature 1100°C).

[0049] The spiral guide channel rotates and accelerates the molten metal, completing the filling of the cavity body within 15 seconds;

[0050] Supplementary pouring through the auxiliary feed pipe eliminates cold shut defects at the blade tip.

[0051] During the cooling stage, the temperature difference is controlled to be ≤200℃ / m. After demolding, the casting is tested and found to be free of porosity and shrinkage defects.

[0052] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0053] This iron outfitting forming mold, through the coordinated design of the upper mold, lower mold, feed pipe, guide channel, cavity, punch, and auxiliary feed pipe, utilizes a spiral guide channel to increase the centrifugal force of the molten metal by a factor of 1, effectively suppressing turbulence. The auxiliary feed pipe increases the saturation of the molten metal in the edge area from 78% to 99.5%. Technical effects: Spiral guide channels are added to the parting surfaces of the upper and lower molds, with the main injection port located at the center of the mold top, and the original injection ports on both sides converted into auxiliary injection ports. Initial injection stage: The main injection port injects 80% of the material at high speed, and the guide channel expands the coverage area. Later injection stage: The auxiliary injection ports on both sides replenish the remaining material, eliminating insufficient filling at the far end. Comparative advantages: Compared with traditional straight injection, the filling time is shortened, and the bubble rate is reduced.

[0054] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0055] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0056] Figure 1 This is a schematic diagram of the structure of this utility model;

[0057] Figure 2 This is a schematic diagram of the upper mold of this utility model;

[0058] Figure 3 This is a schematic diagram of the lower mold of this utility model;

[0059] Figure 4 This is a schematic diagram of the flow channel of this utility model;

[0060] Figure 5 This is a schematic diagram of the structure of the finished product of this utility model.

[0061] In the diagram: 1-Upper mold, 2-Lower mold, 3-Feed pipe, 4-Guide channel, 5-Cavity, 6-Punch, 7-Auxiliary feed pipe. Detailed Implementation

[0062] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0063] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0064] like Figure 1-5 As shown, this iron outfitting forming mold includes an upper mold 1 and a lower mold 2. The upper mold 1 is closed above the lower mold 2. Several feed pipes 3 are fixedly connected to the top of the upper mold 1. A guide channel 4 is opened inside the upper mold 1. The guide channel 4 is spiral.

[0065] A cavity 5 is provided at the bottom of the upper mold 1;

[0066] A punch 6 is fixedly connected to the top of the lower mold 2, and the punch 6 is adapted to the cavity 5;

[0067] The top of the lower die 2 is fixedly connected to an auxiliary feed pipe 7, and the end of the auxiliary feed pipe 7 is connected to the punch 6.

[0068] Example 1: The diameter of the guide channel 4 gradually decreases along the direction from the feed pipe 3 to the cavity 5, and the number of spiral turns is not less than 3. Structure of the spiral guide channel 4:

[0069] A spiral guide channel 4 is opened inside the upper mold 1. The diameter of the guide channel 4 gradually decreases from the inlet of the feed pipe 3 to Φ30mm at the interface of the cavity 5, and the spiral turns 3.5 times (lead 120mm).

[0070] The inner wall of the spiral guide channel 4 is polished and coated with a 0.1mm thick Al2O3-TiC wear-resistant coating.

[0071] Main injection port: Top feed pipe 3 serves as the main injection channel. In the initial stage of injection, 80% of the molten metal (approximately 120 kg) is injected at a flow rate of 3.5 m / s.

[0072] Auxiliary injection port: Four auxiliary feed pipes 7 with a diameter of Φ20mm are arranged in a ring around the outer periphery of the punch 6 of the lower die 2. The axis is inclined at a 25° angle to the horizontal plane. In the later stage of injection, the remaining 20% ​​of the molten metal (about 30kg) is replenished at a flow rate of 1.2m / s.

[0073] Example 2: Gradient temperature control system:

[0074] The lower mold 2 has a built-in temperature regulation component, including:

[0075] Heating element: Cr20Ni80 alloy electric heating element, power density 8W / cm², arranged around the 6 parts of the punch, the mold temperature is raised to 350±10℃ during the preheating stage;

[0076] Cooling water channel: A copper coil is embedded 20mm below the parting surface of the lower mold 2, and 25℃ circulating water is introduced. Gradient cooling is activated after material injection (cooling rate ≤15℃ / min). A temperature regulating component is embedded inside the lower mold 2, which includes interconnected heating pipes and cooling water channels. The heating pipes are arranged around the root of the punch 6. The punch 6 is adapted to the cavity 5. The auxiliary feed pipes 7 are horizontally arranged. There are 4-6 auxiliary feed pipes 7, which are distributed in a ring array around the outer periphery of the punch 6. The axis of each auxiliary feed pipe 7 is inclined at an angle of 15-30° to the horizontal plane.

[0077] The working principle of this utility model is as follows:

[0078] Mold preparation:

[0079] The upper mold 1 and the lower mold 2 are closed, and the punch 6 is embedded in the cavity 5, with a parting surface gap of ≤0.05mm;

[0080] Turn on the heating element to bring the mold working temperature to the set value.

[0081] Injection stage:

[0082] Main injection period (0-15 seconds):

[0083] The molten metal is injected at high speed from the top feed pipe 3 and accelerated by the rotation of the spiral guide channel 4 (tangential speed up to 1.8m / s).

[0084] Guide channel 4 guides the molten metal to cover the cavity surface in an umbrella shape;

[0085] Auxiliary injection period (15-25 seconds):

[0086] The four auxiliary feed pipes are opened simultaneously, and the molten metal fills the edge area of ​​the rudder blade at an inclined angle.

[0087] The pressure sensor monitors the cavity pressure in real time and closes the injection valve when it reaches 1.2 MPa.

[0088] Solidification and demolding:

[0089] Start the cooling water channel to control the rudder body to solidify gradually from the inside out;

[0090] After the mold is opened, the hydraulic ejector rod (located in the lower mold 2 and not shown in the figure) ejects the casting at a speed of 0.5 m / s.

[0091] Compared with the prior art, the present invention has the following advantages:

[0092] This iron outfitting forming mold, through the coordinated arrangement of upper mold 1, lower mold 2, feed pipe 3, guide channel 4, cavity 5, punch 6, and auxiliary feed pipe 7, utilizes a spiral guide channel 4 to increase the centrifugal force of the molten metal by 2.3 times, effectively suppressing turbulence. The auxiliary feed pipe 7 increases the saturation of the molten metal in the edge area from 78% to 99.5%. Technical effects: The upper mold 1 and lower mold 2 parting surfaces are equipped with a spiral guide channel 4, with the main injection port located at the center of the mold top, and the original injection ports on both sides converted into auxiliary injection ports. Initial injection stage: The main injection port injects 80% of the material at high speed, and the guide channel 4 expands the coverage area. Later injection stage: The auxiliary injection ports on both sides replenish the remaining material, eliminating insufficient filling at the far end. Comparative advantages: Compared with traditional straight injection, the filling time is shortened, and the bubble rate is reduced.

Claims

1. A forming mold for iron outfitting parts, characterized in that, Includes an upper mold (1) and a lower mold (2). The upper mold (1) is closed above the lower mold (2). Several feed pipes (3) are fixedly connected to the top of the upper mold (1). A guide channel (4) is opened inside the upper mold (1). The guide channel (4) is spiral. A cavity (5) is provided below the upper mold (1); The top of the lower mold (2) is fixedly connected to a punch (6), which is adapted to the cavity (5); The top of the lower die (2) is fixedly connected to an auxiliary feed pipe (7), and the end of the auxiliary feed pipe (7) is connected to the punch (6).

2. The iron outfitting forming mold as described in claim 1, characterized in that: The diameter of the guide channel (4) gradually decreases along the direction from the feed pipe (3) to the cavity (5), and the number of spiral turns is not less than 3 turns.

3. The iron outfitting forming mold as described in claim 2, characterized in that: The lower mold (2) is equipped with a temperature regulating component, which includes a heating pipe and a cooling water channel that are interconnected. The heating pipe is arranged around the root of the punch (6).

4. The iron outfitting forming mold as described in claim 3, characterized in that: The punch (6) is adapted to the cavity (5).

5. The iron outfitting forming mold as described in claim 4, characterized in that: The auxiliary feed pipe (7) is set horizontally.

6. The iron outfitting forming mold as described in claim 5, characterized in that: There are 4-6 auxiliary feed pipes (7) arranged in a ring array around the outer periphery of the punch (6), and the axis of each auxiliary feed pipe (7) is inclined at an angle of 15-30° to the horizontal plane.

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