Casting process for balancing shaft bracket of mining truck

Abstract

A casting process for a balancing shaft bracket of a mining truck. The process comprises the following steps: S1, configuring a pouring system: sequentially providing in a mounting face in the vertical direction two first ingates, two second ingates and three third ingates, providing a first runner at the ends of the two second ingates away from a balancing shaft bracket pattern, providing a second runner at the ends of the three third ingates away from the balancing shaft bracket pattern, and providing a sprue between the two first ingates; and S2, sequentially performing coating, drying, pit molding, smelting and pouring, so as to obtain a balancing shaft bracket. The pouring system uses a stepped pouring mode to prevent molten metal from concentrating in portions of the balancing shaft bracket pattern close to the sprue, so as to reduce the impact on central holes of the balancing shaft bracket pattern to reduce the occurrence of sand holes and shrinkage cavities, and also avoid local overheating, thus ensuring the quality of castings.

Description

A casting process for a mining truck balance shaft bracket Technical Field

[0001] The present invention relates to the technical field of balance shaft brackets, and in particular to a casting process method for a balance shaft bracket of a mining truck. Background Art

[0002] The balance shaft is installed between the two rear axles to balance the loads on both axles and reduce the vehicle's roll force. The balance shaft bracket is the main load-bearing structure of the balance shaft, and its rationality directly affects the safety and stability of the balance shaft. Technical issues

[0003] To ensure quality, existing technologies typically utilize lost foam casting (LVC) to produce balance shaft brackets. This involves placing a sprue and pouring cup directly above the balance shaft bracket mold. During pouring, molten metal is poured directly from the pouring cup and flows along the sprue into the balance shaft bracket mold.

[0004] However, during the casting process, due to the characteristics of the balance shaft bracket model, the molten metal exerts a strong impact on the center hole of the balance shaft bracket model, causing defects such as sand holes and shrinkage cavities to appear there. Furthermore, due to the influence of the molten metal temperature, the portion of the balance shaft bracket model near the sprue can experience localized overheating, resulting in uneven quality of the balance shaft bracket casting. Technical Solutions

[0005] Based on the above description, the present invention provides a casting process method for a mining truck balance shaft bracket, which aims to solve the problem of low yield of the existing casting method of the mining truck balance shaft bracket.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] A casting process for a mining truck balance shaft bracket comprises the following steps:

[0008] S1. Layout of the gating system: The balancing shaft support model has a mounting surface, with two first ingates, two second ingates, and three third ingates disposed vertically in sequence. A first runner is disposed at one end of the two second ingates away from the balancing shaft support model, and a second runner is disposed at one end of the three third ingates away from the balancing shaft support model. A sprue is disposed between the two first ingates. The first runner and the second runner are both connected to the sprue, and a pouring cup is disposed at the top of the sprue.

[0009] S2, performing coating and drying, box embedding molding and melting and pouring in sequence to obtain the balance shaft bracket.

[0010] On the basis of the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, a graphite chiller is provided on the balance shaft support model.

[0012] Furthermore, a fiber rod is provided between the pouring cup and each of the first inner gates.

[0013] Furthermore, the specific parameters of the coating and drying are as follows:

[0014] 1) Coating ratio: water: composite adhesive: aggregate = 7:1:10;

[0015] 2) Mixing time: binder ≥ 60min, aggregate ≥ 90min;

[0016] 3) Pomei degree: 70% to 72%;

[0017] 4) Drying parameters:

[0018] A. Drying room temperature and humidity: temperature 35℃~55℃, humidity: 10%~35%;

[0019] B. Drying time: 15h for the first pass, 19h for the second pass, 24h for the third pass;

[0020] 5) Coating thickness: 1.2mm~1.5mm.

[0021] Furthermore, the specific steps of the buried box shaping are as follows:

[0022] 1) Add bottom sand and place the model: fill the bottom sand to a height of 80mm-100mm, vibrate for 10s, and use a vibration frequency of 43Hz to scrape the bottom sand into a flat surface. Place one set of models in one box.

[0023] 2) Sand filling vibration: First, use a flexible manual sand adding device to add sand to a certain height, remove the fixed wooden strips, plastic ropes and foam blocks to ensure that there are no debris, and vibrate for 80 seconds at a vibration frequency of 58Hz; evenly fill the sand until it is flush with the sprue, scrape the sand inside and outside to make it flat, and vibrate for 70 seconds at a vibration frequency of 58Hz;

[0024] 3) Cover with plastic film and add top sand: Cover with 2 sheets of plastic film, then fill with top sand with a thickness greater than 80mm. Compact the plastic film to ensure that the plane of the pouring cup is 20mm higher than the sand plane. Then cut the plastic film on the top of the pouring cup to expose it and ensure that there is no molding sand on the top of the pouring cup, and scrape the sand surface flat.

[0025] Furthermore, the mass percentages of the chemical components of the smelting and pouring are: carbon C: 3.5% to 3.8%, silicon Si: 2.5% to 2.7%, manganese Mn: 0.5% to 0.6%, phosphorus P≤0.035%, sulfur S: ≤0.035%, magnesium Mg: 0.035% to 0.055%, copper Cu: 0.4% to 0.5%, tin Sn: 0.015% to 0.02%, and antimony Sb: 0.015% to 0.020%.

[0026] Furthermore, the specific parameters of the smelting and pouring are as follows:

[0027] 1) Furnace temperature: 1570℃~1580℃, first box pouring temperature: 1490℃~1500℃, last box pouring temperature ≥1420℃;

[0028] 2) Pouring negative pressure: -0.045Mpa~-0.055MPa;

[0029] 3) After pouring, maintain pressure for 30 to 40 minutes. Beneficial effects

[0030] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0031] (1) The casting system of the present application utilizes a stepped casting method to avoid the concentration of molten metal in the portion of the balance shaft bracket model close to the sprue. This can not only reduce the impact on the center hole of the balance shaft bracket model, thereby reducing the probability of sand holes and shrinkage cavities, but also avoid the occurrence of local overheating, thereby ensuring the quality of the casting.

[0032] (2) The graphite chiller of the present application can prevent shrinkage of the balance shaft bracket casting, thereby ensuring the quality of the balance shaft bracket casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] FIG1 is a flow chart of a casting process method for a mining truck balance shaft bracket provided in an embodiment of the present invention;

[0034] FIG2 is a schematic structural diagram of a pouring system according to an embodiment of the present invention.

[0035] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0036] 1. Balance shaft bracket model; 11. Mounting surface; 12. Graphite chiller; 2. First ingates; 3. Second ingates; 4. Third ingates; 5. First runner; 6. Second runner; 7. Sprue; 8. Sprue cup; 9. Fiber rod. Modes for Carrying Out the Invention

[0037] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0039] It will be understood that spatial relational terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be understood that in addition to the orientations shown in the figures, spatial relational terms also include different orientations of the device in use and operation. For example, if the device in the drawings is turned over, the element or feature described as "under" or "beneath" or "beneath" the other elements will be oriented as "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include alternative orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0040] When used herein, the singular forms "a", "an", and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0041] 1 and 2 , an embodiment of the present invention provides a method for casting a balance shaft bracket for a mining truck, comprising the following steps:

[0042] S1. Layout of the pouring system: The balancing shaft bracket model 1 has a mounting surface 11, on which two first ingates 2, two second ingates 3 and three third ingates 4 are arranged in sequence in the vertical direction. The two second ingates 3 are provided with a first runner 5 at one end away from the balancing shaft bracket model 1, and the three third ingates 4 are provided with a second runner 6 at one end away from the balancing shaft bracket model 1. A straight runner 7 is provided between the two first ingates 2, and the first runner 5 and the second runner 6 are both connected to the straight runner 7. A pouring cup 8 is provided at the top of the straight runner 7.

[0043] For example, the two first ingates 2 are arranged at intervals along the length direction of the balancing shaft bracket model 1, the two second ingates 3 are arranged at intervals along the length direction of the balancing shaft bracket model 1, and the three third ingates 4 are arranged at intervals along the length direction of the balancing shaft bracket model 1.

[0044] S2, performing coating and drying, box embedding molding and melting and pouring in sequence to obtain the balance shaft bracket.

[0045] 2 , in some embodiments, a graphite chiller 12 is provided on the balance shaft support model 1 .

[0046] According to this embodiment, the graphite chill 12 can prevent the balance shaft bracket casting from shrinking, thereby ensuring the quality of the balance shaft bracket casting.

[0047] 2 , in some embodiments, a fiber rod 9 is provided between the pouring cup 8 and each of the first ingates 2 .

[0048] According to this embodiment, the fiber rods 9 support the pouring cup 8 to prevent the pouring cup 8 and the sprue 7 from breaking.

[0049] In some embodiments, the specific parameters of the coating and drying are as follows:

[0050] 1) Coating ratio: water: composite adhesive: aggregate = 7:1:10; wherein the aggregate can be 100% bauxite.

[0051] 2) Mixing time: binder ≥60min, aggregate ≥90min.

[0052] 3) Pomei degree: 70% to 72%.

[0053] 4) Drying parameters:

[0054] A. Temperature and humidity in the drying room: temperature 35℃~55℃, humidity: 10%~35%.

[0055] B. Drying time: 15h for the first time, 19h for the second time, and 24h for the third time.

[0056] 5) Coating thickness: 1.2mm~1.5mm.

[0057] In this way, the yellow mold can be obtained after the entire pouring system is coated, hung and dried.

[0058] In some embodiments, the specific steps of the embedded box shaping are as follows:

[0059] 1) Add bottom sand and place the model: fill the bottom sand to a height of 80mm to 100mm, vibrate for 10s, and use a vibration frequency of 43Hz to scrape the bottom sand into a flat surface. Place one set of models in one box.

[0060] 2) Sand filling vibration: first use a flexible manual sand adding device to add sand to a certain height, take out the fixed wooden strips, plastic ropes and foam blocks to ensure that there are no debris, and vibrate for 80 seconds at a vibration frequency of 58 Hz; evenly fill the sand until it is flush with the sprue 7, scrape the inner and outer sand flat, and vibrate for 70 seconds at a vibration frequency of 58 Hz.

[0061] 3) Cover with plastic film and add top sand: Cover with 2 sheets of plastic film, then fill with top sand with a thickness greater than 80 mm, compact the plastic film to ensure that the plane of the pouring cup 8 is 20 mm higher than the sand plane, then cut open the plastic film on the top surface of the pouring cup 8 to expose it and ensure that there is no molding sand on the top surface of the pouring cup 8, and scrape the sand surface flat.

[0062] In some embodiments, the mass percentages of the chemical components of the smelting and pouring are: carbon C: 3.5% to 3.8%, silicon Si: 2.5% to 2.7%, manganese Mn: 0.5% to 0.6%, phosphorus P≤0.035%, sulfur S: ≤0.035%, magnesium Mg: 0.035% to 0.055%, copper Cu: 0.4% to 0.5%, tin Sn: 0.015% to 0.02%, and antimony Sb: 0.015% to 0.020%.

[0063] In some embodiments, the specific parameters of the smelting and pouring are as follows:

[0064] 1) Furnace temperature: 1570℃~1580℃, first box pouring temperature: 1490℃~1500℃, last box pouring temperature ≥1420℃.

[0065] 2) Pouring negative pressure: -0.045Mpa~-0.055MPa.

[0066] 3) After pouring, maintain pressure for 30 to 40 minutes. Example 1

[0067] An embodiment of the present invention provides a casting process for a mining truck balance shaft bracket, comprising the following steps:

[0068] S1. Layout of the pouring system: The balancing shaft support model 1 has a mounting surface 11, on which two first ingates 2, two second ingates 3 and three third ingates 4 are arranged in sequence in the vertical direction, the two second ingates 3 are provided with a first runner 5 at one end away from the balancing shaft support model 1, the three third ingates 4 are provided with a second runner 6 at one end away from the balancing shaft support model 1, a straight runner 7 is provided between the two first ingates 2, the first runner 5 and the second runner 6 are both connected to the straight runner 7, a pouring cup 8 is provided at the top of the straight runner 7, a graphite chill 12 is provided on the balancing shaft support model 1, and a fiber rod 9 is provided between the pouring cup 8 and each of the first ingates 2.

[0069] S2, performing coating and drying, box embedding molding and melting and pouring in sequence to obtain the balance shaft bracket.

[0070] The specific parameters of the coating and drying are as follows:

[0071] 1) Coating ratio: water: composite adhesive: aggregate = 7:1:10; wherein the aggregate can be 100% bauxite.

[0072] 2) Mixing time: binder ≥60min, aggregate ≥90min.

[0073] 3) Pomei degree: 70%.

[0074] 4) Drying parameters:

[0075] A. Temperature and humidity in the drying room: temperature 35°C, humidity: 10%.

[0076] B. Drying time: 15h for the first time, 19h for the second time, and 24h for the third time.

[0077] 5) Coating thickness: 1.2mm.

[0078] The specific steps of the buried box shaping are as follows:

[0079] 1) Add bottom sand and place the model: fill the bottom sand to a height of 80mm, vibrate for 10 seconds, and use a vibration frequency of 43Hz to scrape the bottom sand into a flat surface. Place one set of models in one box.

[0080] 2) Sand filling vibration: first use a flexible manual sand adding device to add sand to a certain height, take out the fixed wooden strips, plastic ropes and foam blocks to ensure that there are no debris, and vibrate for 80 seconds at a vibration frequency of 58 Hz; evenly fill the sand until it is flush with the sprue 7, scrape the inner and outer sand flat, and vibrate for 70 seconds at a vibration frequency of 58 Hz.

[0081] 3) Cover with plastic film and add top sand: Cover with 2 sheets of plastic film, then fill with top sand with a thickness greater than 80 mm, compact the plastic film to ensure that the plane of the pouring cup 8 is 20 mm higher than the sand plane, then cut open the plastic film on the top surface of the pouring cup 8 to expose it and ensure that there is no molding sand on the top surface of the pouring cup 8, and scrape the sand surface flat.

[0082] The mass percentages of the chemical components of the smelting and pouring are: carbon C: 3.5%, silicon Si: 2.5%, manganese Mn: 0.5%, phosphorus P≤0.035%, sulfur S: ≤0.035%, magnesium Mg: 0.035, copper Cu: 0.4%, tin Sn: 0.015%, and antimony Sb: 0.015%.

[0083] The specific parameters of the smelting and pouring are as follows:

[0084] 1) Furnace temperature: 1570℃, first box pouring temperature: 1490℃, last box pouring temperature ≥1420℃.

[0085] 2) Pouring negative pressure: -0.045Mpa.

[0086] 3) After pouring, maintain pressure for 30 minutes. Example 2

[0087] An embodiment of the present invention provides a casting process for a mining truck balance shaft bracket, comprising the following steps:

[0088] S1. Layout of the pouring system: The balancing shaft support model 1 has a mounting surface 11, on which two first ingates 2, two second ingates 3 and three third ingates 4 are arranged in sequence in the vertical direction, the two second ingates 3 are provided with a first runner 5 at one end away from the balancing shaft support model 1, the three third ingates 4 are provided with a second runner 6 at one end away from the balancing shaft support model 1, a straight runner 7 is provided between the two first ingates 2, the first runner 5 and the second runner 6 are both connected to the straight runner 7, a pouring cup 8 is provided at the top of the straight runner 7, a graphite chill 12 is provided on the balancing shaft support model 1, and a fiber rod 9 is provided between the pouring cup 8 and each of the first ingates 2.

[0089] S2, performing coating and drying, box embedding molding and melting and pouring in sequence to obtain the balance shaft bracket.

[0090] The specific parameters of the coating and drying are as follows:

[0091] 1) Coating ratio: water: composite adhesive: aggregate = 7:1:10; wherein the aggregate can be 100% bauxite.

[0092] 2) Mixing time: binder ≥60min, aggregate ≥90min.

[0093] 3) Pomei degree: 72%.

[0094] 4) Drying parameters:

[0095] A. Temperature and humidity in the drying room: Temperature: 55°C, humidity: 35%.

[0096] B. Drying time: 15h for the first time, 19h for the second time, and 24h for the third time.

[0097] 5) Coating thickness: 1.5mm.

[0098] The specific steps of the buried box shaping are as follows:

[0099] 1) Add bottom sand and place the model: fill the bottom sand to a height of 100mm, vibrate for 10s, and use a vibration frequency of 43Hz to scrape the bottom sand into a flat surface. Place one set of models in one box.

[0100] 2) Sand filling vibration: first use a flexible manual sand adding device to add sand to a certain height, take out the fixed wooden strips, plastic ropes and foam blocks to ensure that there are no debris, and vibrate for 80 seconds at a vibration frequency of 58 Hz; evenly fill the sand until it is flush with the sprue 7, scrape the inner and outer sand flat, and vibrate for 70 seconds at a vibration frequency of 58 Hz.

[0101] 3) Cover with plastic film and add top sand: Cover with 2 sheets of plastic film, then fill with top sand with a thickness greater than 80 mm, compact the plastic film to ensure that the plane of the pouring cup 8 is 20 mm higher than the sand plane, then cut open the plastic film on the top surface of the pouring cup 8 to expose it and ensure that there is no molding sand on the top surface of the pouring cup 8, and scrape the sand surface flat.

[0102] The chemical components of the smelting and pouring are as follows by mass percentage: carbon C: 3.8%, silicon Si: 2.7%, manganese Mn: 0.6%, phosphorus P≤0.035%, sulfur S: ≤0.035%, magnesium Mg: 0.055%, copper Cu: 0.5%, tin Sn: 0.02%, and antimony Sb: 0.020%.

[0103] The specific parameters of the smelting and pouring are as follows:

[0104] 1) Furnace temperature: 1580℃, first box pouring temperature: 1500℃, last box pouring temperature ≥1420℃.

[0105] 2) Pouring negative pressure: -0.055MPa.

[0106] 3) After pouring, maintain pressure for 40 minutes.

[0107] In this application, the symbol "Hz" is the unit of frequency "Hertz".

[0108] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A casting process method for a balance shaft bracket of a mining card, characterized in that, It includes the following steps: S1. Arrangement of the gating system: The balance shaft bracket model has a mounting surface, and two first ingates, two second ingates, and three third ingates are sequentially arranged in the vertical direction on the mounting surface. A first cross-riser is provided at one end of the two second ingates away from the balance shaft bracket model, and a second cross-riser is provided at one end of the three third ingates away from the balance shaft bracket model. A sprue is provided between the two first ingates. Both the first cross-riser and the second cross-riser are connected to the sprue, and a pouring cup is provided at the top end of the sprue; S2. Sequentially carry out coating drying, flask molding, and melting and pouring to obtain the balance shaft bracket.

2. The foundry process method of a mining truck balance shaft bracket according to claim 1, characterized in that, Graphite chill is provided on the balance shaft bracket model.

3. A casting process method for a mining truck balance shaft bracket according to claim 1, characterized in that, Fiber rods are provided between the pouring cup and each of the first ingates.

4. A casting process method for a mining truck balance shaft bracket according to any one of claims 1 to 3, characterized in that, The specific parameters of the coating drying are as follows: 1) Coating ratio: water: composite binder: aggregate = 7:1:10; 2) Stirring time: for the binder ≥ 60 min, for the aggregate ≥ 90 min; 3) Baumé degree: 70% - 72%; 4) Drying parameters: A. Temperature and humidity in the drying room: temperature: 35°C - 55°C, humidity: 10% - 35%; B. Drying time: the first pass is 15 h, the second pass is 19 h, and the third pass is 24 h; 5) Coating thickness: 1.2 mm - 1.5 mm.

5. A casting process method for a mining truck balance shaft bracket according to any one of claims 1 to 3, characterized in that, The specific steps of the flask molding are as follows: 1) Add bottom sand and place the model: Fill the bottom sand to a height of 80 mm - 100 mm, vibrate for 10 s, vibration frequency: 43 Hz, scrape the bottom sand into a flat surface, and place 1 set of models in one flask; 2) Fill sand and vibrate: First, use a flexible manual sand adding device to add sand to a certain height, take out the fixed wooden strips, plastic ropes, and foam blocks to ensure no debris, vibrate for 80 s, vibration frequency: 58 Hz; evenly fill the sand until it is flush with the sprue, scrape the inner and outer sand flat, and vibrate for 70 s, vibration frequency: 58 Hz; 3) Cover with plastic film and add top sand: Cover 2 layers of plastic film, then fill the top sand with a thickness greater than 80 mm, compact the plastic film to ensure that the plane of the pouring cup is 20 mm higher than the sand plane, then cut open the plastic film on the top surface of the pouring cup to expose it and ensure that there is no molding sand on the top surface of the pouring cup, and scrape the sand surface flat.

6. A foundry process method for a mining truck balance shaft bracket according to any one of claims 1 to 3, characterized in that, The mass percentages of the chemical components of the melting and pouring are as follows: carbon C: 3.5% - 3.8%, silicon Si: 2.5% - 2.7%, manganese Mn: 0.5% - 0.6%, phosphorus P ≤ 0.035%, sulfur S: ≤ 0.035%, magnesium Mg: 0.035 - 0.055%, copper Cu: 0.4% - 0.5%, tin Sn: 0.015% - 0.02%, antimony Sb: 0.015% - 0.020%.

7. A casting process method for a mining truck balance shaft bracket according to claim 6, characterized in that, The specific parameters of the melting and pouring are as follows: 1) Furnace tapping temperature: 1570°C - 1580°C, pouring temperature of the first flask: 1490°C - 1500°C, pouring temperature of the last flask ≥ 1420°C; 2) Pouring negative pressure: -0.045 Mpa - -0.055 MPa; 3) After pouring, keep the pressure for 30 min - 40 min.

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