Hydraulic clamp for automobile die casting

Abstract

The invention discloses a hydraulic clamp for automobile die castings, which belongs to the technical field of automobile die castings and comprises a base provided with a positioning protrusion. The number of the fixing supporting pieces is three, the fixing supporting pieces are installed on the positioning protrusion, the three fixing supporting pieces form an equilateral triangle layout on the positioning protrusion, and the automobile die casting is fixedly supported; and the floating supporting pieces are installed on the positioning protrusions and used for supporting the automobile die casting in a floating mode, the fixed supporting pieces are arranged along the edge of the cavity, and the floating supporting pieces are oppositely arranged in the positioning protrusions. According to the hydraulic clamp for the automobile die casting, precise positioning of the automobile die casting is achieved, the positioning precision is high, the stable machining requirement of the automobile die casting is met, the structure is stable and reliable, all structural elements are high in standardization degree and convenient to manufacture, install and maintain, the automobile die casting can be usually and rapidly placed in and taken out, and the operation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of automobile die castings, and particularly relates to a hydraulic clamp for automobile die castings. BACKGROUND

[0002] Automobile die castings are automobile parts produced by pressure casting process. The production process is to fill molten metal into the die casting mold cavity under high pressure at high speed, and to solidify and form under pressure, so as to obtain parts with complex shape, high precision size and good surface quality. Due to the characteristics of high production efficiency, high material utilization rate and complex structure, automobile die castings play an important role in modern automobile manufacturing, and their quality is directly related to the overall performance of the automobile. As key components in automobile manufacturing, automobile die castings cover engine blocks, transmission housings, body structural parts, steering knuckles, hubs and many other categories. The precision of these parts directly affects the performance, safety and service life of the automobile. In the production process of automobile die castings, from the die casting blank to the finished part, it often needs to go through multiple machining processes such as milling, drilling, boring and grinding. The performance of the clamp, as the core tooling equipment in the machining process, directly determines the machining precision, production efficiency and product qualification rate.

[0003] In the machining process of automobile die castings, the clamp plays a crucial role. It needs to accurately position the die casting on the machine tool table and apply sufficient clamping force to ensure that the die casting does not shift or vibrate during machining, thereby ensuring the machining size accuracy, shape and position accuracy and surface quality. However, traditional automobile die casting clamps have many defects:

[0004] Firstly, the positioning method is not reasonable. Traditional clamps often use the entire large surface of the die casting blank as the positioning reference. Due to the influence of factors such as mold temperature, metal liquid flowability and cooling speed during the die casting process, the blank is prone to deformation (such as warping, concave, uneven shrinkage, etc.), resulting in low size consistency of the blank. For example, the flatness error of the large surface of the automobile die casting blank may reach 0.5-1mm. When using the large surface for positioning, the clamp cannot compensate for the deformation of the blank, making the reference surface unstable during the machining process of the die casting, which leads to the size of the machined parts being out of tolerance, and the machining yield rate can only be maintained at 70%-80%;

[0005] Secondly, the clamping force is unevenly distributed. The clamping mechanism of traditional clamps is not reasonably designed, and the clamping points are not properly selected, which can easily cause additional deformation of the die casting during clamping. For example, some clamps use single-point clamping or asymmetric clamping methods, which can cause excessive stress on the local die casting and plastic deformation, affecting the machining accuracy and part performance;

[0006] Third, poor adaptability. Different models and structures of automotive die-cast parts require specialized fixtures, resulting in low fixture versatility. Changing fixtures requires a significant amount of time for adjustment, impacting production efficiency. Statistics show that the change and adjustment time for traditional fixtures is typically 1-2 hours, severely restricting the flexible production line.

[0007] Fourth, the operation is complex. Traditional fixtures mostly use manual or semi-automatic operation methods. Clamping and releasing actions require manual intervention, which not only increases the labor intensity of workers, but also easily leads to positioning errors or damage to parts due to improper operation. At the same time, the consistency of manual operation is poor, making it difficult to ensure the stability of part processing quality in mass production.

[0008] With the rapid development of the automotive industry, the precision requirements for automotive die-cast parts are becoming increasingly stringent. Traditional mechanical and pneumatic fixtures are no longer sufficient to meet the demands of high-precision machining. Hydraulic fixtures, with their advantages of high clamping force, convenient speed adjustment, smooth operation, and high degree of automation, have been widely used in the field of automotive die-casting parts processing. This invention addresses the problems of insufficient positioning accuracy, poor adaptability, and complex operation of existing automotive die-casting fixtures by proposing a structurally optimized and reliable hydraulic fixture for automotive die-casting parts, aiming to provide strong support for the efficient and high-precision machining of automotive die-cast parts. Summary of the Invention

[0009] The purpose of this invention is to overcome the shortcomings of existing automotive die-casting fixtures, such as low positioning accuracy, poor adaptability, and complex operation, and to provide a hydraulic fixture for automotive die-casting parts. This fixture can achieve precise positioning and stable clamping of automotive die-casting parts, meet the requirements of high-precision processing, and has the advantages of stable and reliable structure, convenient operation, and strong adaptability.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is: a hydraulic clamp for automotive die castings, comprising...

[0011] A base, wherein a positioning protrusion is provided on the base, and a cavity is provided at the center of the positioning protrusion. The positioning protrusion and the base are integrally formed, and the positioning protrusion is located at the center of the base.

[0012] The fixed support members are three in number and are installed on the positioning protrusion. The three fixed support members form an equilateral triangle layout on the positioning protrusion. The fixed support members are convex structures. The bottom end of the fixed support member is embedded in the positioning protrusion and the top end is located outside the positioning protrusion, so as to fix and support the automotive die-casting part.

[0013] A floating support component is installed floatingly within the positioning protrusion. The floating support component is a cylindrical structure used to float and support the automotive die-casting part.

[0014] The fixed support is disposed along the edge of the cavity, and the floating support is disposed opposite to the positioning protrusion.

[0015] In a preferred embodiment of the present invention, three sets of hydraulic cylinders are provided on the base. The hydraulic cylinders are located at the outer edge of the positioning protrusion, and the hydraulic cylinders press the automotive die-casting part through the first pressure block.

[0016] In a preferred embodiment of the present invention, the pressing point of the first pressing block and the support point of the fixed support are on the same vertical line, so as to press the automotive die-casting part located on the fixed support.

[0017] In a preferred embodiment of the present invention, the first pressure block is connected to the piston rod of the hydraulic cylinder via a connecting seat, and the first pressure block rotates around the connecting seat as the center position under the drive of the hydraulic cylinder.

[0018] In a preferred embodiment of the present invention, a cylinder is provided on the base, the cylinder is located at the outer edge of the positioning protrusion, and the cylinder presses the automotive die-casting part tightly through the second pressure block.

[0019] In a preferred embodiment of the present invention, the pressing point of the second pressing block and the support point of the floating support are on the same vertical line, so as to press the automotive die-casting part located on the floating support.

[0020] In a preferred embodiment of the present invention, the second pressure block is connected to the piston rod of the cylinder via another connecting seat, and the second pressure block rotates with the connecting seat as the center position under the drive of the cylinder.

[0021] In a preferred embodiment of the present invention, a floating cylinder is provided inside the positioning protrusion, and the floating support is located at the end of the floating cylinder, and the number of floating supports is two.

[0022] In a preferred embodiment of the present invention, the positioning protrusion is provided with a mounting hole for mounting the floating cylinder.

[0023] In a preferred embodiment of the present invention, the positioning protrusion is provided with a cylindrical positioning pin and a rhomboid positioning pin. The rhomboid positioning pin is provided with two parallel planes to position the automotive die-casting part and restrict the rotational freedom of the automotive die-casting part.

[0024] This invention addresses the shortcomings of the prior art and has the following beneficial effects:

[0025] The hydraulic clamp for automotive die castings of this invention achieves precise positioning of automotive die castings with high positioning accuracy, meeting the stable processing requirements of automotive die castings. Furthermore, its structure is stable and reliable, with a high degree of standardization of each structural component, making it convenient to manufacture, install, and maintain. Automotive die castings can usually be quickly placed in and removed, improving operational efficiency.

[0026] 1. High positioning accuracy: The three fixed support components arranged in an equilateral triangle achieve "three-point positioning". Combined with the combination of cylindrical positioning pins and rhomboid positioning pins, the positioning error of automotive die castings can be controlled within 0.01mm. This effectively solves the problem of inaccurate positioning caused by blank deformation in traditional fixtures. At the same time, the adaptive adjustment function of the floating support components can compensate for local deformation of the die castings, further improving positioning stability.

[0027] 2. Reliable Clamping: A combination of hydraulic and pneumatic cylinders is used for clamping. The hydraulic cylinders provide a larger clamping force for the fixed support area, while the pneumatic cylinders provide a moderate clamping force for the floating support area. The clamping points correspond one-to-one with the support points, ensuring uniform clamping force distribution and preventing additional deformation of the die-cast parts. The clamping force can be precisely adjusted through the control system to adapt to the processing requirements of different types of die-cast parts.

[0028] 3. Convenient operation: The clamping and loosening actions of the fixture are automatically controlled by hydraulic and pneumatic systems. The operator only needs to place the automotive die-casting part on the fixture and start the control button to complete the positioning and clamping process. The clamping time of a single workpiece can be shortened to 10-15 seconds, which is 5-8 times more efficient than traditional manual fixtures. At the same time, the use of an external guide mechanism further simplifies the clamping operation and reduces the labor intensity of workers.

[0029] 4. Stable and reliable structure: All parts of the fixture are made of high-strength and high-wear-resistant materials, and are precision machined and heat-treated to ensure the rigidity and service life of the structure. The standardization of each structural component is high. For example, hydraulic cylinders, air cylinders, and positioning pins are all standard parts, which facilitates manufacturing, installation and maintenance, and reduces the maintenance cost and downtime of the equipment.

[0030] 5. High adaptability: With the adjustable height of the floating support and the adjustable clamping force, this fixture can adapt to the processing needs of automotive die-casting parts of different sizes and shapes, such as automotive die-casting parts, transmission housings and other components. This improves the versatility of the fixture, reduces the investment in special fixtures, and lowers production costs. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0032] Figure 1 This is a schematic diagram of a preferred embodiment of the present invention for mounting automotive die-cast parts;

[0033] Figure 2 This is a schematic diagram of the overall structure of a preferred embodiment of the present invention;

[0034] Figure 3 for Figure 2 Enlarged view of section A in the middle;

[0035] Figure 4 for Figure 2 Top view;

[0036] In the figure: 10, base; 11, positioning protrusion; 20, fixed support; 30, floating support; 40, hydraulic cylinder; 50, first pressure block; 60, cylinder; 70, second pressure block; 80, floating cylinder; 90, cylindrical positioning pin; 100, rhomboid positioning pin. Detailed Implementation

[0037] The following drawings will disclose several embodiments of the present invention. For clarity, many physical details will be described in the following description. However, it should be understood that these physical details are not intended to limit the invention. That is, in some embodiments of the invention, these physical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0038] This embodiment provides a hydraulic clamp for automotive die castings. This hydraulic clamp enables precise positioning of automotive die castings with high positioning accuracy, meeting the stable processing requirements of automotive die castings. Furthermore, its structure is stable and reliable, with a high degree of standardization of each structural component, making it convenient to manufacture, install, and maintain. Automotive die castings can typically be quickly placed in and removed, improving operational efficiency.

[0039] Combination Figures 1 to 4 As shown, the hydraulic clamp for automotive die castings in this embodiment includes a base 10, a fixed support 20, and a floating support 30. The fixed support 20 and the floating support 30 are both located on the positioning protrusion 11, providing fixed support and floating support for the automotive die castings, respectively. The clamping and releasing actions of this hydraulic clamp for automotive die castings are automatically controlled by a hydraulic and pneumatic system. The operator only needs to place the automotive die casting on the clamp and start the control button to complete the positioning and clamping process. The clamping time for a single workpiece can be shortened to 10-15 seconds, which is 5-8 times more efficient than traditional manual clamps. At the same time, the use of an external guide mechanism further simplifies the clamping operation and reduces the labor intensity of workers.

[0040] In this embodiment, a positioning protrusion 11 is provided on the base 10, and a cavity is provided at the center of the positioning protrusion 11. The positioning protrusion 11 and the base 10 are integrally formed. The positioning protrusion 11 is located at the center of the base 10. There are three fixing support members 20 installed on the positioning protrusion 11. The three fixing support members 20 form an equilateral triangle layout on the positioning protrusion 11. The fixing support members 20 are convex structures. The bottom end of the fixing support member 20 is embedded in the positioning protrusion 11, and the top end is located outside the positioning protrusion 11 to fix and support the automotive die-casting part. In this embodiment, the fixing support member 20 defines a plane to ensure the stability of the reference plane of the automotive die-casting part and the clamping plane. The fit is perfect, avoiding positioning errors caused by deformation or unevenness of the automotive die-cast blank. The fixed support 20 adopts an equilateral triangle layout, converting the theoretical "three-point plane" into a practical engineering solution. In this embodiment, the fixed support 20 is made of 45 steel with heat treatment (hardness 220-250HBW) and is fixed to the positioning protrusion 11 by M16 internal hex bolts. The wear-resistant pad on the top of the fixed support 20 is made of GCr15 bearing steel, with a surface hardening hardness of HRC60 and a spherical radius of 60mm. The wear-resistant pad and the fixed support 20 are connected by an interference fit to ensure that the fixed support 20 will not loosen during use.

[0041] Furthermore, three sets of hydraulic cylinders 40 are provided on the base 10. The hydraulic cylinders 40 are located at the outer edge of the positioning protrusion 11. The hydraulic cylinders 40 press the automotive die-casting part with the first pressure block 50. The pressing point of the first pressure block 50 is on the same vertical line as the support point of the fixed support member 20, so as to press the automotive die-casting part located on the fixed support member 20. In this embodiment, three sets of hydraulic cylinders 40 are installed on the base 10, and the positions of the three fixed support members 20 are distributed in an equilateral triangle. The hydraulic cylinders 40 are double-acting single piston rod type, with an inner diameter of 100mm, a piston rod diameter of 50mm, a stroke of 80mm, and a working pressure of The hydraulic cylinder has a rated pressure of 15 MPa and is powered by a hydraulic station. The hydraulic station uses a variable displacement pump for oil supply, with a flow rate adjustment range of 10-30 L / min. The first pressure block 50 is made of 40CrNiMo alloy steel plate with a thickness of 12 mm, a length of 200 mm, and a width of 40 mm. One end is hinged to the piston rod of the hydraulic cylinder 40 via a spherical bearing. The spherical bearing is model GE40ES, with an inner diameter of 40 mm, an outer diameter of 62 mm, and a rated dynamic load of 75 kN, allowing the first pressure block 50 to rotate within a range of ±60°. The arc-shaped pressure head at the other end is wrapped with polyurethane material with a Shore hardness of 85. The pressure head is bolted to the pressure block for easy replacement.

[0042] Specifically, the first pressure block 50 is connected to the piston rod of the hydraulic cylinder 40 via a connecting seat. The first pressure block 50 rotates around the connecting seat under the drive of the hydraulic cylinder 40, with a verticality error not exceeding 0.008mm. The clamping force is set to 10kN and is monitored in real time by a pressure sensor in the hydraulic system, with an adjustment accuracy of ±0.05kN. Three fixed support members 20 arranged in an equilateral triangle layout achieve "three-point positioning". Combined with the combination positioning of cylindrical positioning pins 90 and rhomboid positioning pins 100, the positioning error of the automotive die-casting part can be controlled within 0.01mm, effectively solving the problem of inaccurate positioning caused by blank deformation in traditional fixtures. At the same time, the adaptive adjustment function of the floating support member 30 can compensate for local deformation of the die-casting part, further improving the positioning stability.

[0043] In this embodiment, the floating support 30 is floatingly installed within the positioning protrusion 11. The floating support 30 is a cylindrical structure used to float and support the automotive die-cast part. In this embodiment, the floating support 30 operates under the action of the floating cylinder 80 to float and support the automotive die-cast part. There are two floating support 30s, symmetrically distributed on both sides of the central axis of the positioning protrusion 11, with a spacing of 250mm. The support column of the floating support 30 is made of 40Cr alloy structural steel, with a diameter of 30mm and a length of 40mm. The floating head is made of HT350 wear-resistant cast iron, is hemispherical, and has a radius of 20mm. The floating head and the support column are connected by a spring made of 60Si2Mn steel. Made of spring steel with a stiffness coefficient of 80 N / mm and a maximum compression of 10 mm, a floating cylinder 80 is installed in the positioning protrusion 11 corresponding to the floating support 30. The floating cylinder 80 is a double-acting piston type with a cylinder diameter of 63 mm, a piston rod diameter of 32 mm, a stroke of 20 mm, and a working pressure of 0.8 MPa. The piston rod end of the floating cylinder 80 is connected to the support column of the floating support 30 through a flange. The flange is positioned by a locating pin to ensure that the coaxiality error of the floating support 30 does not exceed 0.01 mm. The floating cylinder 80 can drive the floating support 30 to move up and down. The support height can be precisely controlled by adjusting the pressure of the cylinder 60, which can adapt to automotive die-cast blanks of different thicknesses.

[0044] Furthermore, a cylinder 60 is provided on the base 10. The cylinder 60 is located at the outer edge of the positioning protrusion 11. The cylinder 60 presses the automotive die-casting part through the second pressure block 70. The pressing point of the second pressure block 70 is on the same vertical line as the support point of the floating support 30, so as to press the automotive die-casting part located on the floating support 30. The second pressure block 70 is connected to the piston rod of the cylinder 60 through another connecting seat. The second pressure block 70 rotates under the drive of the cylinder 60 with the connecting seat as the center position. In this embodiment, through the height adjustment and clamping force adjustment function of the floating support 30, the fixture can adapt to the processing needs of automotive die-casting parts of different sizes and shapes, such as automotive die-casting parts, transmission housings and other parts, which improves the versatility of the fixture, reduces the investment in special fixtures, and reduces production costs.

[0045] Specifically, in this embodiment, a floating cylinder 80 is provided inside the positioning protrusion 11, and a floating support 30 is located at the end of the floating cylinder 80. There are two floating support 30s. The positioning protrusion 11 is provided with mounting holes to install the floating cylinder 80.

[0046] This embodiment uses a combination of hydraulic cylinder 40 and pneumatic cylinder 60 for clamping. Hydraulic cylinder 40 provides a large clamping force for fixing the support area, while pneumatic cylinder 60 provides a moderate clamping force for the floating support area. The clamping points correspond one-to-one with the support points to ensure uniform distribution of clamping force and avoid additional deformation of the die-cast parts. The clamping force can be precisely adjusted through the control system to adapt to the processing needs of different types of die-cast parts. The clamping and releasing actions of the fixture are automatically controlled through hydraulic and pneumatic systems. Operators only need to place the automotive die-cast part on the fixture and start the control button to complete the positioning and clamping process. The clamping time of a single workpiece can be shortened to 10-15 seconds, which is 5-8 times more efficient than traditional manual fixtures. At the same time, the setting of the external guide mechanism further simplifies the clamping operation and reduces the labor intensity of workers. Moreover, all parts of the fixture are made of high-strength and high-wear-resistant materials, and are precision machined and heat-treated to ensure the rigidity and service life of the structure. The standardization of each structural component is high. For example, hydraulic cylinder 40, pneumatic cylinder 60, positioning pins, etc. are all standard parts, which facilitates manufacturing, installation and maintenance, and reduces equipment maintenance costs and downtime.

[0047] In this embodiment, the fixed support member 20 is arranged along the edge of the cavity, and the floating support member 30 is arranged opposite to it within the positioning protrusion 11. The positioning protrusion 11 is provided with a cylindrical positioning pin 90 and a rhomboid positioning pin 100. The rhomboid positioning pin 100 has two parallel planes to position the automotive die-casting part and restrict the rotational freedom of the automotive die-casting part. The positioning protrusion 11 is equipped with one cylindrical positioning pin 90 and one rhomboid positioning pin 100 for precise positioning of the automotive die-casting part. The cylindrical positioning pin 90 is made of 40Cr steel, with a diameter of 25mm and a length of 60mm, and its surface is ground. The surface roughness Ra is 0.8μm. It adopts H7 / js6 transition fit with the mounting hole on the positioning protrusion 11. After installation, the perpendicularity error between the center line of the pin and the upper surface of the positioning protrusion 11 does not exceed 0.005mm. The diamond positioning pin 100 and the cylindrical positioning pin 90 are made of the same material, with a nominal diameter of 25mm and a chamfer width of 18mm (0.72 times the diameter). The surface roughness of the chamfered part is Ra1.6μm. It also adopts H7 / js6 fit with the mounting hole. The distance between the two positioning pins is 300mm, which is precisely arranged according to the position of the positioning hole on the automotive die casting.

[0048] In this embodiment, the positioning protrusion 11 is provided with a cylindrical positioning pin 90 and a rhomboid positioning pin 100 to position the automotive die casting. The cylindrical positioning pin 90 in this embodiment can restrict the translational freedom of the automotive die casting in the X and Y directions. The cylindrical positioning pin 90 achieves the limiting operation by closely contacting the inner wall of one of the positioning holes of the automotive die casting. The rhomboid positioning pin 100 in this embodiment is based on the cylindrical positioning pin 90, with a portion of material symmetrically removed from its opposite sides to form two parallel planes (beveled edges). Its cross-section is similar to an elongated circle or a racetrack shape, but more commonly the width formed by the beveled edge is smaller than the diameter of the cylinder. It mainly restricts the rotational freedom of the automotive die casting around the Z axis. The rhomboid positioning pin 100 achieves this by having its beveled edge contact the hole wall of the other positioning hole of the automotive die casting at two points in the characteristic direction.

[0049] In practical use, the hydraulic clamp for automotive die castings in this embodiment combines fixed support members 20 and floating support members 30. Three fixed support members 20 arranged in an equilateral triangle achieve "three-point positioning," and combined with the positioning of cylindrical locating pins 90 and rhomboid locating pins 100, the positioning error of the automotive die casting can be controlled within 0.01mm. This effectively solves the problem of inaccurate positioning caused by blank deformation in traditional clamps. Simultaneously, the adaptive adjustment function of the floating support member 30 can compensate for local deformation of the die casting, further improving positioning stability. Through the height adjustment and clamping force adjustment functions of the floating support member 30, this clamp can adapt to the processing needs of automotive die castings of different sizes and shapes, such as automotive die castings. The fixture is suitable for various components such as castings and transmission housings, improving its versatility, reducing the investment in specialized fixtures, and lowering production costs. After the automotive die-casting part is positioned, the hydraulic cylinder 40 drives the first pressure block 50 to clamp the automotive die-casting part, and the pneumatic cylinder 60 drives the second pressure block 70 to clamp the automotive die-casting part, achieving downward positioning of the automotive die-casting part. Its positioning accuracy is high, meeting the stable processing requirements of automotive die-casting parts. The clamping method using the combination of hydraulic cylinder 40 and pneumatic cylinder 60 provides a larger clamping force for the fixed support area, while the pneumatic cylinder 60 provides a moderate clamping force for the floating support area. The clamping points correspond one-to-one with the support points, ensuring uniform distribution of clamping force and avoiding additional deformation of the die-casting part. The clamping force can be precisely adjusted through the control system to adapt to the processing requirements of different types of die castings. Furthermore, the fixture components in this embodiment are made of high-strength, high-wear-resistant materials and undergo precision machining and heat treatment to ensure structural rigidity and service life. The standardization of each structural component is high; for example, hydraulic cylinder 40, air cylinder 60, and positioning pins are all standard parts, which facilitates manufacturing, installation, and maintenance, reducing equipment maintenance costs and downtime. Automotive die castings can usually be quickly inserted and removed, improving operational efficiency.

[0050] The hydraulic clamp for automotive die-casting parts in this embodiment includes the following operating steps in actual operation:

[0051] 1. Preparation stage: The operator selects the corresponding automotive die-casting part model on the touch screen, the system calls the preset parameters, the hydraulic station and pneumatic system start, and enter the standby state;

[0052] 2. Place the workpiece: Lift the automobile die-casting blank to the top of the fixture using the hoisting equipment. Under the guidance of the external guide mechanism, align the positioning holes on the cylinder body with the cylindrical positioning pin 90 and the diamond positioning pin 100. Slowly lower the cylinder body so that the bottom surface of the cylinder body contacts the fixed support 20 and the floating support 30.

[0053] 3. Positioning stage: The floating cylinder 80 moves, driving the floating support 30 to rise and adaptively adjust the height so that the bottom surface of the cylinder body is in close contact with the three fixed support members 20. The cylindrical positioning pin 90 and the diamond positioning pin 100 are inserted into the positioning hole of the cylinder body to complete the precise positioning.

[0054] 4. Clamping stage: The three sets of hydraulic cylinders 40 act simultaneously, driving the first pressure block 50 to rotate and press against the corresponding position of the cylinder body. The clamping force reaches 10kN and is maintained. Then the two air cylinders 60 act, driving the second pressure block 70 to rotate and press against the floating support area of ​​the cylinder body. The clamping force reaches 3kN and is maintained. At this time, the cylinder body is completely fixed.

[0055] 5. Machining stage: The PLC sends a clamping completion signal to the machining center, and the machining center begins to perform milling, drilling and other machining operations on the cylinder block;

[0056] 6. Release the workpiece: After processing is completed, the machining center sends a processing completion signal to the PLC. Cylinder 60 is activated first, driving the second pressure block 70 to release. Then, hydraulic cylinder 40 is activated, driving the first pressure block 50 to release. Floating cylinder 80 is activated, driving the floating support 30 to descend. The operator uses hoisting equipment to lift the processed cylinder body off the fixture, completing one processing cycle.

[0057] While the invention has been described above with reference to various embodiments, it should be understood that many changes and modifications can be made without departing from the scope of the invention. That is, the methods, systems, or devices discussed above are merely examples. Various configurations can be appropriately omitted, substituted, or added to various processes or components. For example, in alternative configurations, methods can be performed in a different order than described, and / or various stages can be added, omitted, and / or combined. Moreover, features described with respect to certain configurations can be combined in various other configurations. Different aspects and elements of the configuration can be combined in a similar manner. Furthermore, as technology develops, many elements are merely examples and do not limit the scope of this disclosure or the claims.

[0058] In summary, the above detailed description is intended to be exemplary rather than limiting, and it should be understood that the claims (including all equivalents) are intended to define the spirit and scope of the invention. These embodiments should be understood as illustrative only and not as limiting the scope of protection of the invention. After reading this description, those skilled in the art can make various alterations or modifications to the invention, and these equivalent changes and modifications also fall within the scope defined by the claims.

Claims

1. A hydraulic clamp for automotive die-casting parts, characterized in that, include A base (10) is provided with a positioning protrusion (11), and a cavity is provided at the center of the positioning protrusion (11). The positioning protrusion (11) and the base (10) are integrally formed, and the positioning protrusion (11) is located at the center of the base (10). Fixed support member (20), the number of fixed support members (20) is three and installed on the positioning protrusion (11). The three fixed support members (20) form an equilateral triangle layout on the positioning protrusion (11). The fixed support member (20) is a convex structure. The bottom end of the fixed support member (20) is embedded in the positioning protrusion (11) and the top end is located outside the positioning protrusion (11) to fix and support the automotive die-casting part. A floating support (30) is installed floatingly within the positioning protrusion (11). The floating support (30) is a cylindrical structure used to float and support the automotive die-casting parts. The fixed support (20) is arranged along the edge of the cavity, and the floating support (30) is arranged opposite to the positioning protrusion (11).

2. The hydraulic clamp for automotive die-casting parts according to claim 1, characterized in that, Three sets of hydraulic cylinders (40) are provided on the base (10). The hydraulic cylinders (40) are located at the outer edge of the positioning protrusion (11). The hydraulic cylinders (40) press the automobile die casting through the first pressure block (50).

3. A hydraulic clamp for automotive die castings according to claim 2, characterized in that, The pressing point of the first pressing block (50) and the support point of the fixed support member (20) are on the same vertical line to press the automobile die casting on the fixed support member (20).

4. A hydraulic clamp for automotive die castings according to claim 2, characterized in that, The first pressure block (50) is connected to the piston rod of the hydraulic cylinder (40) through a connecting seat. The first pressure block (50) rotates with the connecting seat as the center position under the drive of the hydraulic cylinder (40).

5. A hydraulic clamp for automotive die castings according to claim 1, characterized in that, A cylinder (60) is provided on the base (10). The cylinder (60) is located at the outer edge of the positioning protrusion (11). The cylinder (60) presses the automobile die casting part through the second pressure block (70).

6. A hydraulic clamp for automotive die castings according to claim 5, characterized in that, The pressing point of the second pressing block (70) is on the same vertical line as the support point of the floating support (30) to press the automotive die casting on the floating support (30).

7. A hydraulic clamp for automotive die castings according to claim 5, characterized in that, The second pressure block (70) is connected to the piston rod of the cylinder (60) via another connecting seat. The second pressure block (70) rotates with the connecting seat as the center position under the drive of the cylinder (60).

8. A hydraulic clamp for automotive die castings according to claim 1, characterized in that, A floating cylinder (80) is provided inside the positioning protrusion (11), and the floating support (30) is located at the end of the floating cylinder (80). There are two floating supports (30).

9. A hydraulic clamp for automotive die castings according to claim 8, characterized in that, The positioning protrusion (11) is provided with mounting holes for mounting the floating cylinder (80).

10. A hydraulic clamp for automotive die castings according to claim 1, characterized in that, The positioning protrusion (11) is provided with a cylindrical positioning pin (90) and a rhomboid positioning pin (100). The rhomboid positioning pin (100) has two parallel planes to position the automobile die casting and restrict the rotational freedom of the automobile die casting.

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