Integral compression molding die for hard alloy liner of high-capacity ball mill with reinforcing ribs

Abstract

The utility model discloses an integral compression molding die for a hard alloy inner container of a high-capacity ball mill with reinforcing ribs, the inner container comprises a shell and a bottom plate, the shell comprises a small cylindrical surface, a small conical surface, a large conical surface and a large cylindrical surface which are sequentially connected from top to bottom, and the bottom plate is arranged at the bottom of the large cylindrical surface. More than two reinforcing ribs are longitudinally arranged on the inner side of the large cylinder from top to bottom in parallel, the mold is an assembled mold and comprises a square core shaft and four inner mold bodies attached to the four side faces of the square core shaft, and after the four inner mold bodies are spliced to the four side faces of the square core shaft, the outer side faces of the four inner mold bodies are matched with the shell in shape; and groove structures matched with the reinforcing ribs are longitudinally arranged at the corresponding positions of the lower end of the four-section inner mold from top to bottom in parallel. According to the utility model, the square core shaft is combined with the four-petal inner mold, so that the mold can be conveniently mounted and demolded.

Description

Technical Field

[0001] This utility model relates to the field of cemented carbide manufacturing technology, specifically a cemented carbide inner liner integral pressing mold with reinforcing ribs for a large-capacity ball mill. Background Technology

[0002] In the production of cemented carbide products, wet grinding is a crucial process, its efficiency directly impacting the quality of the finished product. A wet grinding mill consists of a cylinder (inner liner), a geared motor, sprockets and chains, bearings, hydraulic cylinders, a frame, and a control system. The cylinder (inner liner) is one of the most critical components. In the 1980s and 90s, ball mills initially used alloy liners, with hundreds of alloy liners forming the inner liner. During production, these liners were prone to detachment, requiring frequent repairs and severely impacting delivery times. To address this, ball mills with non-magnetic stainless steel inner liners were developed. Using non-magnetic stainless steel for the 200L / 300L inner liner of a ball mill (also called a wet grinding mill) offers advantages such as ease of manufacture and relatively low cost. However, it also has disadvantages such as increased wear and tear, and the mixing of abrasive material with the grinding media, leading to increased impurities in the grinding media and affecting its performance. To reduce the mixing of grinding media, some existing technologies use carbide liner materials instead of stainless steel, such as the novel carbide stirred ball mill disclosed in Chinese patent CN106513691A. However, due to the limitations of the carbide material itself, it is difficult to manufacture a large-capacity carbide liner with a capacity of 200L or more through one-piece molding.

[0003] The information disclosed in the above background section is only intended to enhance the understanding of the overall background of this utility model, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Utility Model Content

[0004] To address the aforementioned shortcomings, the purpose of this invention is to provide a one-piece pressing mold for a large-capacity ball mill inner liner with reinforcing ribs. The use of a square mandrel combined with a four-lobed inner mold facilitates mold installation and demolding.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A mold for integrally pressing a large-capacity ball mill inner liner with reinforcing ribs is disclosed. The inner liner includes a shell and a bottom plate. The shell consists of a small cylindrical surface, a small conical surface, a large conical surface, and a large cylindrical surface connected sequentially from top to bottom. The bottom plate is provided at the bottom of the large cylindrical surface. Two or more reinforcing ribs are arranged longitudinally and parallel from top to bottom on the inner side of the large cylindrical surface. The mold is an assembly mold, including a square mandrel and four-lobed inner molds that fit against the four sides of the square mandrel. After the four-lobed inner molds are assembled to the four sides of the square mandrel, the shape of their outer surfaces is adapted to the shell. At the corresponding position at the lower end of the four-lobed inner molds, groove structures adapted to the reinforcing ribs are arranged longitudinally and parallel from top to bottom.

[0007] Furthermore, the two ends of the square mandrel protrude from the top and bottom surfaces of the four inner molds, respectively.

[0008] Furthermore, the inner liner has a capacity of 200-300L.

[0009] Furthermore, the internal diameter of the cross-section of the large cylindrical surface is 620–707 mm.

[0010] Furthermore, the number of reinforcing ribs is 4 to 12.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] This utility model is a mold designed for the hard alloy inner liner of a large-capacity ball mill with a special shape. By combining a square mandrel with a four-lobed inner mold, the mold can be easily installed and demolded. Attached Figure Description

[0013] Figure 1 Here is a schematic diagram of the integral carbide inner liner structure described in this embodiment of the present invention.

[0014] Figure 2 Here is a schematic diagram of the cemented carbide integral inner liner assembly mold structure described in this embodiment of the present invention.

[0015] Figure 3 See: Top view of the cemented carbide integral inner liner assembly mold described in this embodiment of the utility model;

[0016] Figure 4 Exploded view of the cemented carbide integral inner liner assembly mold described in this embodiment of the present invention;

[0017] Figure 5 Here is a schematic diagram of the cold isostatic pressing of the integral cemented carbide inner liner according to an embodiment of this utility model;

[0018] In the figure, 1-small cylindrical surface; 2-small conical surface; 3-large conical surface; 4-large cylindrical surface; 5-base plate; 6-first inner mold; 7-second inner mold; 8-third inner mold; 9-fourth inner mold; 10-square mandrel; 11-first plug; 12-first plug; 14-hard alloy powder; 13-assembled mold; 15-elastic mold sleeve; 16-preheated base plate; 17-groove; 18-reinforcing rib. Detailed Implementation

[0019] To explain the technical content, objectives, and effects of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings. In the description of these embodiments, it should be understood that terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing these embodiments and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] Example 1: Specifications of a 300L reinforced cemented carbide integral inner liner: height 1100mm, diameter 707mm, wall thickness 14mm, weight 535kg; the cemented carbide is YG10 grade cemented carbide. The inner liner includes a shell and a bottom plate 5. The shell consists of a small cylindrical surface 1, a small conical surface 2, a large conical surface 3, and a large cylindrical surface 4 connected sequentially from top to bottom. The bottom plate 5 is set at the bottom of the large cylindrical surface 4. Four reinforcing ribs 18 are arranged longitudinally and parallel from top to bottom on the inner side of the large cylindrical surface 4. The width of the reinforcing ribs 18 is 20mm, the height is 15mm, and the length is slightly less than the height of the large cylindrical surface 4, which is 600mm. The method includes the following steps:

[0021] Step 1: Mold assembly. The mold is an assembly mold 13, including a square mandrel 10 and four inner molds that fit against the four sides of the square mandrel 10. The four inner molds are the first inner mold 6, the second inner mold 7, the third inner mold 8, and the fourth inner mold 9. After the four inner molds are assembled to the four sides of the square mandrel 10, their outer surface shape is adapted to the shell. At the corresponding position at the lower end of the four inner molds, grooves 17 that are adapted to the reinforcing ribs 18 are arranged longitudinally and parallel from top to bottom. First, fix one end of the square mandrel 10 to the first plug 11, then install the four inner molds on the four sides of the square mandrel 10, put an elastic mold sleeve on the outside of the four inner molds, put hard alloy powder 14 between the elastic mold sleeve and the four inner molds, and finally fix the other end of the square mandrel 10 with the second plug 12, thus completing the assembly of the pressing mold.

[0022] Step 2: Pressing: Place the mold containing the cemented carbide powder 14 into a dry bag cold isostatic press for pressing. When pressing, the circumference of the elastic mold sleeve is evenly compressed, while the two ends of the elastic mold sleeve are not compressed.

[0023] Step 3: Demolding. First, remove the first plug 11 and the second plug 12. Then, remove the square mandrel 10 and the four-lobed inner mold. Finally, remove the pressed inner shell from the elastic mold sleeve.

[0024] Step 4, Sintering: The pressed inner shell and the pre-sintered base plate 16 are sintered together to finally obtain a cemented carbide inner shell for a large-capacity ball mill with reinforcing ribs.

[0025] Example 2: Specifications of a 300L reinforced cemented carbide integral inner liner: height 1100mm, diameter 707mm, wall thickness 14mm, weight 595kg; the cemented carbide is YG10-YG25 grade. The inner liner includes a shell and a bottom plate 5. The shell consists of a small cylindrical surface 1, a small conical surface 2, a large conical surface 3, and a large cylindrical surface 4 connected sequentially from top to bottom. The bottom plate 5 is located at the bottom of the large cylindrical surface 4. Eight reinforcing ribs 18 are arranged longitudinally and parallel from top to bottom on the inner side of the large cylindrical surface 4. The width of the reinforcing ribs 18 is 20mm, the height is 15mm, and the length is slightly less than the height of the large cylindrical surface 4, which is 600mm. The method includes the following steps:

[0026] Step 1: Mold assembly. The mold is an assembly mold 13, including a square mandrel 10 and four inner molds that fit against the four sides of the square mandrel 10. The four inner molds are the first inner mold 6, the second inner mold 7, the third inner mold 8, and the fourth inner mold 9. After the four inner molds are assembled to the four sides of the square mandrel 10, their outer surface shape is adapted to the shell. At the corresponding position at the lower end of the four inner molds, grooves 17 that are adapted to the reinforcing ribs 18 are arranged longitudinally and parallel from top to bottom. First, fix one end of the square mandrel 10 to the first plug 11, then install the four inner molds on the four sides of the square mandrel 10, put an elastic mold sleeve on the outside of the four inner molds, put hard alloy powder 14 between the elastic mold sleeve and the four inner molds, and finally fix the other end of the square mandrel 10 with the second plug 12, thus completing the assembly of the pressing mold.

[0027] Step 2: Pressing: Place the mold containing the cemented carbide powder 14 into a dry bag cold isostatic press for pressing. When pressing, the circumference of the elastic mold sleeve is evenly compressed, while the two ends of the elastic mold sleeve are not compressed.

[0028] Step 3: Demolding. First, remove the first plug 11 and the second plug 12. Then, remove the square mandrel 10 and the four-lobed inner mold. Finally, remove the pressed inner shell from the elastic mold sleeve.

[0029] Step 4, Sintering: The pressed inner shell and the pre-sintered base plate 16 are sintered together to finally obtain a cemented carbide inner shell for a large-capacity ball mill with reinforcing ribs.

[0030] Example 3: Specifications of a 300L reinforced cemented carbide integral inner liner: height 1100mm, diameter 707mm, wall thickness 14mm, weight 655kg; the cemented carbide is YG10-YG25 grade. The inner liner includes a shell and a bottom plate 5. The shell consists of a small cylindrical surface 1, a small conical surface 2, a large conical surface 3, and a large cylindrical surface 4 connected sequentially from top to bottom. The bottom plate 5 is located at the bottom of the large cylindrical surface 4. Twelve reinforcing ribs 18 are arranged longitudinally and parallel from top to bottom on the inner side of the large cylindrical surface 4. The width of the reinforcing rib 18 is 20mm, the height is 15mm, and the length is slightly less than the height of the large cylindrical surface 4, which is 600mm. The method includes the following steps:

[0031] Step 1: Mold assembly. The mold is an assembly mold 13, including a square mandrel 10 and four inner molds that fit against the four sides of the square mandrel 10. The four inner molds are the first inner mold 6, the second inner mold 7, the third inner mold 8, and the fourth inner mold 9. After the four inner molds are assembled to the four sides of the square mandrel 10, their outer surface shape is adapted to the shell. At the corresponding position at the lower end of the four inner molds, grooves 17 that are adapted to the reinforcing ribs 18 are arranged longitudinally and parallel from top to bottom. First, fix one end of the square mandrel 10 to the first plug 11, then install the four inner molds on the four sides of the square mandrel 10, put an elastic mold sleeve on the outside of the four inner molds, put hard alloy powder 14 between the elastic mold sleeve and the four inner molds, and finally fix the other end of the square mandrel 10 with the second plug 12, thus completing the assembly of the pressing mold.

[0032] Step 2: Pressing: Place the mold containing the cemented carbide powder 14 into a dry bag cold isostatic press for pressing. When pressing, the circumference of the elastic mold sleeve is evenly compressed, while the two ends of the elastic mold sleeve are not compressed.

[0033] Step 3: Demolding. First, remove the first plug 11 and the second plug 12. Then, remove the square mandrel 10 and the four-lobed inner mold. Finally, remove the pressed inner shell from the elastic mold sleeve.

[0034] Step 4, Sintering: The pressed inner shell and the pre-sintered base plate 16 are sintered together to finally obtain a cemented carbide inner shell for a large-capacity ball mill with reinforcing ribs.

[0035] Example 4: Specifications of a 200L reinforced cemented carbide integral inner liner: height 1030mm, diameter 620mm, wall thickness 14mm, weight 429kg; the cemented carbide is YG10 grade cemented carbide. The inner liner includes a shell and a bottom plate 5. The shell consists of a small cylindrical surface 1, a small conical surface 2, a large conical surface 3, and a large cylindrical surface 4 connected sequentially from top to bottom. The bottom plate 5 is set at the bottom of the large cylindrical surface 4. Four reinforcing ribs 18 are arranged longitudinally and parallel from top to bottom on the inner side of the large cylindrical surface 4. The width of the reinforcing ribs 18 is 20mm, the height is 15mm, and the length is slightly less than the height of the large cylindrical surface 4, which is 600mm. The method includes the following steps:

[0036] Step 1: Mold assembly. The mold is an assembly mold 13, including a square mandrel 10 and four inner molds that fit against the four sides of the square mandrel 10. The four inner molds are the first inner mold 6, the second inner mold 7, the third inner mold 8, and the fourth inner mold 9. After the four inner molds are assembled to the four sides of the square mandrel 10, their outer surface shape is adapted to the shell. At the corresponding position at the lower end of the four inner molds, grooves 17 that are adapted to the reinforcing ribs 18 are arranged longitudinally and parallel from top to bottom. First, fix one end of the square mandrel 10 to the first plug 11, then install the four inner molds on the four sides of the square mandrel 10, put an elastic mold sleeve on the outside of the four inner molds, put hard alloy powder 14 between the elastic mold sleeve and the four inner molds, and finally fix the other end of the square mandrel 10 with the second plug 12, thus completing the assembly of the pressing mold.

[0037] Step 2: Pressing: Place the mold containing the cemented carbide powder 14 into a dry bag cold isostatic press for pressing. When pressing, the circumference of the elastic mold sleeve is evenly compressed, while the two ends of the elastic mold sleeve are not compressed.

[0038] Step 3: Demolding. First, remove the first plug 11 and the second plug 12. Then, remove the square mandrel 10 and the four-lobed inner mold. Finally, remove the pressed inner shell from the elastic mold sleeve.

[0039] Step 4, Sintering: The pressed inner shell and the pre-sintered base plate 5 are sintered together to finally obtain a cemented carbide inner shell for a large-capacity ball mill with reinforcing ribs.

[0040] Example 5: Specifications of a 200L reinforced cemented carbide integral inner liner: height 1030mm, diameter 620mm, wall thickness 14mm, weight 469kg; the cemented carbide is YG15 grade cemented carbide. The inner liner includes a shell and a bottom plate 5. The shell consists of a small cylindrical surface 1, a small conical surface 2, a large conical surface 3, and a large cylindrical surface 4 connected sequentially from top to bottom. The bottom plate 5 is set at the bottom of the large cylindrical surface 4. Eight reinforcing ribs 18 are arranged longitudinally and parallel from top to bottom on the inner side of the large cylindrical surface 4. The width of the reinforcing ribs 18 is 20mm, the height is 15mm, and the length is slightly less than the height of the large cylindrical surface 4. The method includes the following steps:

[0041] Step 1: Mold assembly. The mold is an assembly mold 13, including a square mandrel 10 and four inner molds that fit against the four sides of the square mandrel 10. The four inner molds are the first inner mold 6, the second inner mold 7, the third inner mold 8, and the fourth inner mold 9. After the four inner molds are assembled to the four sides of the square mandrel 10, their outer surface shape is adapted to the shell. At the corresponding position at the lower end of the four inner molds, grooves 17 that are adapted to the reinforcing ribs 18 are arranged longitudinally and parallel from top to bottom. First, fix one end of the square mandrel 10 to the first plug 11, then install the four inner molds on the four sides of the square mandrel 10, put an elastic mold sleeve on the outside of the four inner molds, put hard alloy powder 14 between the elastic mold sleeve and the four inner molds, and finally fix the other end of the square mandrel 10 with the second plug 12, thus completing the assembly of the pressing mold.

[0042] Step 2: Pressing: Place the mold containing the cemented carbide powder 14 into a dry bag cold isostatic press for pressing. When pressing, the circumference of the elastic mold sleeve is evenly compressed, while the two ends of the elastic mold sleeve are not compressed.

[0043] Step 3: Demolding. First, remove the first plug 11 and the second plug 12. Then, remove the square mandrel 10 and the four-lobed inner mold. Finally, remove the pressed inner shell from the elastic mold sleeve.

[0044] Step 4, Sintering: The pressed inner shell and the pre-sintered base plate 5 are sintered together to finally obtain a cemented carbide inner shell for a large-capacity ball mill with reinforcing ribs.

[0045] Example 6: Specifications of a 200L reinforced cemented carbide integral inner liner: height 1030mm, diameter 620mm, wall thickness 14mm, weight 509kg; the cemented carbide is YG25 grade cemented carbide. The inner liner includes a shell and a bottom plate 5. The shell consists of a small cylindrical surface 1, a small conical surface 2, a large conical surface 3, and a large cylindrical surface 4 connected sequentially from top to bottom. The bottom plate 5 is set at the bottom of the large cylindrical surface 4. Twelve reinforcing ribs 18 are arranged longitudinally and parallel from top to bottom on the inner side of the large cylindrical surface 4. The width of the reinforcing rib 18 is 20mm, the height is 15mm, and the length is slightly less than the height of the large cylindrical surface 4. The method includes the following steps:

[0046] Step 1: Mold assembly. The mold is an assembly mold 13, including a square mandrel 10 and four inner molds that fit against the four sides of the square mandrel 10. The four inner molds are the first inner mold 6, the second inner mold 7, the third inner mold 8, and the fourth inner mold 9. After the four inner molds are assembled to the four sides of the square mandrel 10, their outer surface shape is adapted to the shell. At the corresponding position at the lower end of the four inner molds, grooves 17 that are adapted to the reinforcing ribs 18 are arranged longitudinally and parallel from top to bottom. First, fix one end of the square mandrel 10 to the first plug 11, then install the four inner molds on the four sides of the square mandrel 10, put an elastic mold sleeve on the outside of the four inner molds, put hard alloy powder 14 between the elastic mold sleeve and the four inner molds, and finally fix the other end of the square mandrel 10 with the second plug 12, thus completing the assembly of the pressing mold.

[0047] Step 2: Pressing: Place the mold containing the cemented carbide powder 14 into a dry bag cold isostatic press for pressing. When pressing, the circumference of the elastic mold sleeve is evenly compressed, while the two ends of the elastic mold sleeve are not compressed.

[0048] Step 3: Demolding. First, remove the first plug 11 and the second plug 12. Then, remove the square mandrel 10 and the four-lobed inner mold. Finally, remove the pressed inner shell from the elastic mold sleeve.

[0049] Step 4, Sintering: The pressed inner shell and the pre-sintered base plate 5 are sintered together to finally obtain a cemented carbide inner shell for a large-capacity ball mill with reinforcing ribs.

[0050] This utility model is a mold designed for the hard alloy inner liner of a large-capacity ball mill with a special shape. By combining a square mandrel with a four-lobed inner mold, the mold can be easily installed and demolded.

[0051] Although the present invention has been described in detail above with specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A mold for integrally pressing and forming a large-capacity ball mill inner liner with reinforcing ribs, characterized in that: The inner container comprises a shell and a bottom plate, the shell is sequentially connected from top to bottom as a small cylindrical surface, a small conical surface, a large conical surface, a large cylindrical surface, the bottom plate is arranged at the bottom of the large cylindrical surface, and more than two reinforcing ribs are arranged longitudinally and in parallel from top to bottom on the inner side of the large cylindrical surface, the mold is an assembled mold comprising a square core shaft and four-petal inner molds attached to the four sides of the square core shaft, the outer side surface shape of the four-petal inner molds after being attached to the four sides of the square core shaft is matched with the shell, and recess groove structures matched with the reinforcing ribs are arranged longitudinally and in parallel from top to bottom at the corresponding positions of the lower end of the four-petal inner molds.

2. The integral press forming die for the cemented carbide liner of a large capacity ball mill with a reinforcing rib according to claim 1, characterized in that: The two ends of the square core shaft respectively protrude the top surface and the bottom surface of the four-petal inner molds.

3. The integral press forming die for the cemented carbide liner of a large capacity ball mill with a reinforcing rib according to claim 1, characterized in that: The capacity of the inner container is 200-300L.

4. The integral press forming die for the cemented carbide liner of a large capacity ball mill with a reinforcing rib according to claim 1, characterized in that: The internal diameter of the cross section of the large cylindrical surface is 620-707mm.

5. The integral press forming die for the cemented carbide liner of a large capacity ball mill with a reinforcing rib according to claim 1, characterized in that: The number of the reinforcing ribs is 4-12.

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