Adaptive hot-pressing sizing device for casting

Abstract

The invention relates to the technical field of metal sizing, in particular to an adaptive hot-pressing sizing device for castings, which comprises an upper template and a lower template, an upper die pressing plate and a lower die base plate are respectively fixed on the upper plate surface of the upper template and the lower plate surface of the lower template, and a sizing pressing block is fixed in the middle of the lower plate surface of the upper template. The middle of the upper plate face of the lower die plate is provided with a shape correction pressing groove which is used for containing a cast part in a matched mode and allowing the shape correction pressing block to be inserted and abut against the cast part for shape correction. A gas outlet hole is formed in the center of the lower surface of the shape correcting pressing block, the inner end of the gas outlet hole is communicated with a gas inlet pipe, a heating unit is arranged on a pipe body of the gas inlet pipe, and the gas inlet pipe is connected with a pressurizing unit used for conveying protective gas; according to the adaptive hot-pressing shape correcting device, protective gas is directly used for stamping shape correcting, the heating uniformity and stability are improved, and high-temperature oxidation is prevented.

Description

Technical Field

[0001] This invention relates to the field of metal shaping technology, and in particular to an adaptive hot pressing shaping device for castings. Background Technology

[0002] As is generally known, metal hot pressing and straightening refers to the process of applying a certain pressure during the hot working of metals to cause the metal material to undergo plastic deformation at high temperature, thereby achieving the purpose of correcting the shape, removing defects, and improving the material properties. This process is often used in the production and repair of metal parts, such as eliminating warping deformation and repairing damaged parts. In particular, some metal castings are more likely to have various problems that require further correction. As described in the Chinese utility model with announcement number CN222153425U, the heating method of the existing hot pressing and shaping mold is to install heating tubes inside the template and then directly perform hot pressing. This makes the metal prone to high-temperature oxidation and may also cause internal stress or cracks in the metal due to uneven heating and inaccurate temperature control, resulting in uneven deformation and shaping failure. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art and solve the existing technical problems, the present invention discloses an adaptive hot pressing and shaping device for castings, which directly uses protective gas for pressing and shaping, improves the uniformity and stability of heating, and prevents high-temperature oxidation.

[0004] To achieve the above object, the present invention adopts the following technical solutions: An adaptive hot pressing and shaping device for castings includes an upper template and a lower template. An upper mold pressing plate and a lower mold base plate are respectively fixed to the upper plate surface of the upper template and the lower plate surface of the lower template. A shaping pressure block is fixed in the middle of the lower plate surface of the upper template. A shaping pressure groove for placing the casting and for inserting the shaping pressure block to press against the casting for shaping is provided in the middle of the upper plate surface of the lower template. An air outlet is provided in the center of the lower surface of the shaping pressure block. An air inlet pipe is connected to the inner end of the air outlet. A heating unit is provided in the body of the air inlet pipe. The air inlet pipe is connected to a pressurizing unit for conveying protective gas.

[0005] Furthermore, one side of the upper template is provided with a through hole corresponding to the inner end of the air outlet. A temperature detector is sealed and inserted at one end of the through hole. The temperature detector is connected to the heating unit via a corresponding signal. A quick-connect fitting for connecting the air inlet pipe is installed at the other end of the through hole.

[0006] Furthermore, the lower template is provided with a reflux cavity, and the wall of the shaping groove is uniformly provided with a plurality of reflux inlet holes. The height of the outer end of the reflux inlet hole from the bottom of the shaping groove is less than the thickness of the casting. The inner end of each reflux inlet hole is connected to the corresponding outer edge of the reflux cavity. The lower plate surface of the lower template is provided with a reflux outlet hole, and the inner end of the reflux outlet hole is connected to the middle of the reflux cavity.

[0007] Furthermore, the upper plate surface of the upper template is uniformly provided with multiple limiting grooves around its outer edge, and multiple positioning blocks are adapted to be inserted into the limiting grooves.

[0008] Furthermore, the bottom surface of the limiting groove is provided with a threaded through hole, and an adjusting screw is provided in the threaded through hole.

[0009] Furthermore, the forming device also includes a hydraulic unit for controlling the downward displacement of the upper mold pressing plate, and a blue light scanner for detecting the deformation trend of the casting.

[0010] Furthermore, the lower plate surface of the lower template is uniformly provided with multiple lower mold base plates.

[0011] Furthermore, the casting is made of aluminum alloy, and the protective gas is argon or hydrogen.

[0012] Furthermore, the heating unit is configured as an electric heating pad that surrounds the air intake pipe.

[0013] Furthermore, the pressurization unit is configured as a pressurization pump.

[0014] By employing the technical solution described above, the present invention has the following beneficial effects: The adaptive hot pressing and shaping device for castings disclosed in this invention can use high-temperature and high-pressure protective gas to impact the surface of the casting during the process of the upper and lower molds approaching each other for shaping, thereby heating and pre-pressing the casting. Compared with traditional heating tube heat transfer, the temperature gradient change is not significant and the heating is more uniform. It can also protect the surface of the casting and prevent high-temperature oxidation. More importantly, the adjustment of gas temperature and pressure by the heating unit and pressurizing unit is more stable and accurate, resulting in better casting shaping effect. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of an embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the AA-direction cross-section structure; Figure 3 This is a three-dimensional structural diagram of the lower template.

[0016] In the diagram: 1. Upper template; 2. Shaping pressure block; 3. Upper mold pressing plate; 4. Air outlet; 5. Through hole; 6. Quick connector; 7. Air inlet pipe; 8. Lower template; 9. Return outlet hole; 10. Casting; 11. Return cavity; 12. Lower mold base plate; 13. Adjusting screw; 14. Return inlet hole; 15. Positioning block; 16. Temperature detector; 17. Connecting column; 18. Threaded through hole; 19. Shaping pressure groove. Detailed Implementation

[0017] The technical solution of the present invention will be described below with reference to the accompanying drawings of the embodiments of the present invention. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" indicating the orientation or positional relationship, they are only corresponding to the accompanying drawings of the present invention for the convenience of describing the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation. Example 1:

[0018] Combined with appendix Figure 1 The aforementioned adaptive hot pressing and shaping device for castings includes an upper mold plate 1 and a lower mold plate 8. An upper mold pressing plate 3 and a lower mold base plate 12 are fixed to the upper surface of the upper mold plate 1 and the lower surface of the lower mold plate, respectively. The upper mold pressing plate 3 is generally used to connect a hydraulic unit, such as a hydraulic press. The upper mold pressing plate 3 is connected to the lifting column end of the hydraulic press to control its downward pressing displacement. A shaping pressure block 2 is fixed in the middle of the lower surface of the upper mold plate 1. The upper surface of the lower mold plate 8 is provided with a groove 19 for the shaping block 2 to press against and shape the casting 10. The shaping block 2 can slide into the groove 19 to compress and shape the casting 10. The shaping device also includes a blue light scanner for detecting the deformation trend of the casting 10. By detecting the deformation trend of the casting 10 with the blue light scanner, the pressing distance between the upper mold plate 1 and the lower mold plate 8 is controlled to achieve precise shaping of the casting 10. The lower surface of the calibrating block 2 has a central air outlet 4, and the inner end of the air outlet 4 is connected to an air inlet pipe 7. Depending on the requirements, the air outlet 4 is a vertical hole. One side of the upper template 1 has a through hole 5 corresponding to and connected to the inner end of the air outlet 4. A temperature detector 16 is sealed and inserted into one end of the through hole 5. The temperature detector 16 is used to detect the temperature of the fluid entering the air outlet 4. A quick-connect fitting 6 for connecting the air inlet pipe 7 is fixedly installed at the other end of the through hole 5. The air inlet pipe 7 has a heating unit. Specifically, the heating unit is an electric heating pad that surrounds the air inlet pipe 7. The electric heating pad heats the protective gas passing through the air inlet pipe 7, and can also directly heat the gas supply source. The temperature detector 16 is connected to the corresponding signal of the heating unit. It adjusts the heating power by detecting the temperature to ensure the stability and precise control of the heating temperature. The air inlet pipe 7 is connected to a pressurizing unit for delivering protective gas. The pressurizing unit can be a pressurizing pump. The protective gas source is pressurized by the pressurizing pump and then enters the air inlet pipe 7 for delivery. Of course, the gas source can also be a high-pressure bottle, which does not require a pressurizing pump. Only a pressure regulating valve is needed to control the pressure. As needed, the casting part 10 is made of aluminum alloy. The forming temperature is generally controlled between 200 and 400 degrees Celsius, the forming pressure is generally controlled between 5 and 15 MPa, and the protective gas is argon or hydrogen.

[0019] The adaptive hot pressing and straightening device for castings of the present invention, before straightening, first places the casting 10 into the bottom of the straightening pressure groove 19, then controls the upper template 1 to move down so that the air outlet 4 is 50-100mm away from the casting 10. Then, a low-temperature and low-pressure protective gas is first introduced into the air inlet pipe 7, and the temperature and pressure are gradually increased so that the casting 10 can be slowly and evenly heated in the protective gas. When the temperature and pressure gradually reach the set values, the upper template 1 is controlled to move down gradually so that the gap between it and the casting 10 is less than 2mm. The pressure of the protective gas impact and dispersion is used to pre-straighten the casting 10. Then, the upper template 1 is controlled to press down against the casting 10 to complete the final extrusion straightening. Example 2:

[0020] When the casting 10 is thin, heating from one side can ensure uniform heating. However, if the casting 10 has a certain thickness, heating from one side may not guarantee uniform heating from both sides. The difference from Embodiment 1 is that the lower template 8 has a reflux cavity 11, and the shaping groove 19 has multiple reflux inlet holes 14 evenly arranged around its wall. The distance between the outer end of the reflux inlet hole 14 and the bottom of the shaping groove 19 is less than the thickness of the casting 10. The inner ends of the reflux inlet holes 14 are all connected to the corresponding outer edges of the reflux cavity 11. The lower plate surface of the lower template 8 has a reflux outlet hole 9 in the center, and the inner end of the reflux outlet hole 9 is connected to the middle of the reflux cavity 11. The protective gas discharged from the vent hole 4 impacts and heats the casting 10, then disperses and enters the reflux cavity 11 through the reflux inlet holes 14 to conduct heat to the lower surface of the casting 10. The gas is then recovered through the reflux outlet hole 9 to prevent energy waste. (See attached...) Figure 2 and 3 As shown, multiple return inlets 14 can also be connected together to form a whole annular hole. This requires fixing connecting columns 17 between the upper and lower walls of the return cavity 11 to ensure the pressure resistance of the lower template 8 without hindering the flow of protective gas. As needed, multiple lower mold base plates 12 are evenly arranged around the lower plate surface of the lower template 8 to avoid the return outlet 9 while providing support space and ensuring support stability. Example 3:

[0021] The difference from Embodiment 1 is that the upper plate surface of the upper template 1 is uniformly provided with multiple limiting grooves around the outer edge, and multiple positioning blocks 15 are adapted to be inserted in the limiting grooves. The positioning blocks 15 abut against the upper template 1 to limit the movement and prevent the upper template 1 from moving down too much. As needed, the bottom surface of the limiting groove is provided with a threaded through hole 18, and an adjusting screw 13 is provided in the threaded through hole 18. The limiting height of the positioning block 15 is adjusted by turning the adjusting screw 13.

[0022] The parts of this invention not described in detail are prior art. It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the above embodiments should be regarded as exemplary and non-limiting in all respects. The scope of this invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims within this invention, and no reference numerals in the claims should be regarded as limiting the content of the claims.

Claims

1. An adaptive hot pressing and shaping device for castings, comprising an upper template and a lower template, wherein an upper mold pressing plate and a lower mold base plate are respectively fixed to the upper plate surface of the upper template and the lower plate surface of the lower template, a shaping pressure block is fixed in the middle of the lower plate surface of the upper template, and a shaping pressure groove for placing the casting and for inserting the shaping pressure block to press against the casting for shaping is provided in the middle of the upper plate surface of the lower template, characterized in that: The lower surface of the shaping block is provided with an air outlet in the center. The inner end of the air outlet is connected to an air inlet pipe. The body of the air inlet pipe is provided with a heating unit. The air inlet pipe is connected to a pressurizing unit for conveying protective gas.

2. The adaptive hot pressing and shaping device for castings according to claim 1, characterized in that: One side of the upper template is provided with a through hole corresponding to the inner end of the air outlet. A temperature detector is sealed and inserted at one end of the through hole. The temperature detector is connected to the heating unit via a signal. A quick connector for connecting the air inlet pipe is installed at the other end of the through hole.

3. The adaptive hot pressing and shaping device for castings according to claim 1, characterized in that: The lower template is provided with a reflux cavity, and the wall of the shaping groove is uniformly provided with a plurality of reflux inlet holes. The height of the outer end of the reflux inlet hole from the bottom of the shaping groove is less than the thickness of the casting. The inner end of each reflux inlet hole is connected to the corresponding outer edge of the reflux cavity. The lower plate surface of the lower template is provided with a reflux outlet hole in the center, and the inner end of the reflux outlet hole is connected to the middle of the reflux cavity.

4. The adaptive hot pressing and shaping device for castings according to claim 1, characterized in that: The upper plate of the upper template is uniformly provided with multiple limiting grooves around its outer edge, and multiple positioning blocks are adapted to be inserted into the limiting grooves.

5. The adaptive hot pressing and shaping device for castings according to claim 4, characterized in that: The bottom surface of the limiting groove is provided with a threaded through hole, and an adjusting screw is provided in the threaded through hole.

6. The adaptive hot pressing and shaping device for castings according to claim 1, characterized in that: The forming device also includes a hydraulic unit for controlling the downward displacement of the upper mold pressing plate, and a blue light scanner for detecting the deformation trend of the casting.

7. The adaptive hot pressing and shaping device for castings according to claim 1, characterized in that: The lower plate of the lower template is evenly provided with multiple lower template base plates.

8. The adaptive hot pressing and shaping device for castings according to claim 1, characterized in that: The casting is made of aluminum alloy, and the protective gas is argon or hydrogen.

9. The adaptive hot pressing and shaping device for castings according to claim 1, characterized in that: The heating unit is configured as an electric heating pad that surrounds the air intake pipe.

10. The adaptive hot pressing and shaping device for castings according to claim 1, characterized in that: The pressurization unit is a pressurization pump.

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