Hydraulic riveting device and method for oil scale of lubricating oil tank

Abstract

The invention discloses a hydraulic riveting device and method for a lubricating oil tank oil scale. The riveting device comprises a lower die base, a female die, a rubber mat, a pin, a screw, a spring, a pressing rod, a guide plate and a supporting base. During hydraulic forming, the oil scale to be riveted is arranged in the female die, then the hydraulic riveting device and the oil scale are placed into a hydraulic machine workbench together, after a hydraulic machine is started, the main cylinder drives the pressing rod, and riveting of the oil scale is completed when the pressing rod reaches the maximum stroke. Rapid one-time riveting can be achieved by adopting the method for riveting the lubricating oil tank oil scale, due to the fact that the height of a forming face is guaranteed, key sizes such as the height and the diameter of a pier head after rivet riveting are effectively controlled, and the qualified standard of design patterns and riveting quality inspection can be met. One-time riveting can be achieved for riveting of a structure with multiple rivets arranged side by side, the efficiency is high, and the one-time riveting success rate is larger than 90%.

Description

Technical Field

[0001] The invention belongs to the technical field of riveting assembly process, and specifically is a special solid riveting radial riveting device for an oil dipstick of an aviation accessory lubricating oil tank, and is particularly suitable for a one-time riveting processing device and a riveting method for multiple rivets and narrow spacing. Background Art

[0002] The oil dipstick is a common part type in oil container products and is widely used in the manufacturing fields of automobiles, ships, aviation equipment, etc. Its main function is to measure the volume of oil in the fuel tank container. The corresponding oil amount can be read through the liquid level line formed after the oil dipstick body is immersed in the oil. At the same time, most of the connections between the oil dipstick body and the oil dipstick seat are achieved through riveting technology, especially the fuel tank containers commonly found in the oil circuit systems of aircraft, ships, and automobiles.

[0003] In order to ensure the installation reliability of the oil dipstick body, the number of rivets in the common oil dipstick structure is usually more than 2, and the rivet spacing is small. Conventional riveting methods include manual stamping riveting, air riveting gun riveting and other methods. The rivet heads and pier heads processed by the manual stamping riveting method are prone to cuts, sinking, cracks and other mechanical damage defects, and these two methods can only achieve the riveting of a single rivet, with low processing efficiency and poor positioning accuracy, resulting in slanted pier heads after riveting. The difference between the minimum height and the maximum height of the slanted pier head exceeds the standard requirements, the riveting pass rate is not high, and the product quality is reduced. Summary of the invention

[0004] The present invention aims to provide a hydraulic riveting device and method for an oil dipstick of a lubricating oil tank, so as to solve the defects of the oil dipstick during the riveting process and the low efficiency of multiple riveting, improve the qualified rate and efficiency of riveting, reduce the production cost of the enterprise, improve the product quality, and make the riveting quality and size of the oil dipstick meet the technical requirements.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A hydraulic riveting device for a lubricating oil tank dipstick, comprising:

[0007] Support seats, two of which are placed in parallel and spaced apart;

[0008] A concave die, the concave die is placed between the two support seats, the top end surface of the concave die is provided with a mounting limit rectangular groove for the oil dipstick body and a mounting limit semicircular groove for the outer sleeve of the oil dipstick, the top end surface of the concave die between the mounting limit rectangular groove and the mounting limit semicircular groove is also provided with a hemispherical groove for placing the rivet head on the oil dipstick, and a rectangular groove for mounting a rubber pad is provided on each side of the hemispherical groove;

[0009] A rubber pad, the rubber pad being placed in a rectangular groove for installing the rubber pad;

[0010] A guide plate, the guide plate is located above the die, and the two ends of the guide plate are respectively connected to the tops of the two support seats, and a through hole is opened on the guide plate;

[0011] A pressure rod, the pressure rod is inserted into the through hole of the guide plate, a first limiting step is arranged at the upper end of the pressure rod, a rivet forming pier head is formed in a plane at the lower end of the pressure rod, and a second limiting step is arranged on the pressure rod and between the first limiting step and the rivet forming pier head;

[0012] The spring is sleeved on the pressure rod, and one of the two axial end faces of the spring is in close contact with the first limiting step of the pressure rod head, and the other end face is in close contact with the top end face of the guide plate.

[0013] Furthermore, the oil tank oil dipstick hydraulic riveting device also includes a lower die seat, which serves as the bottom plate of the entire hydraulic riveting device and is connected to the working platform of the hydraulic device. The main body of the lower die seat is a rectangular steel plate, and the support seat and the bottom of the die are both installed on the lower die seat.

[0014] further,

[0015] The lower die base is provided with a first pin hole and a first screw hole, wherein the first pin hole is a through hole and the first screw hole is a countersunk hole;

[0016] The bottom of the die is provided with a second pin hole and a second screw hole, wherein the second pin hole and the second screw hole are both blind holes;

[0017] The bottom of the support seat is provided with a third pin hole and a third screw hole, wherein the third pin hole and the third screw hole are both blind holes;

[0018] The die is connected to the lower die base via pins in the first pin hole and the second pin hole and screws in the first screw hole and the second screw hole, and the support base is connected to the lower die base via pins in the first pin hole and the third pin hole and screws in the first screw hole and the third screw hole.

[0019] As an option, the pin is a cylindrical pin that complies with the GB / T119-86 standard, and the screw is a hexagon socket head screw that complies with the GB / T2089-2009 standard.

[0020] As an option, a picking groove is also provided on the die and between the installation limit semicircular groove and the hemispherical groove. The picking groove runs through the two end faces in the width direction of the die, and the bottom surface of the picking groove is lower than the bottom surface of the installation limit semicircular groove.

[0021] Furthermore, a threaded blind hole is provided on the top end surface of the support seat, a threaded through hole is opened on the guide plate, and the guide plate is connected to the top of the support seat by screws screwed into the threaded through hole and the threaded blind hole.

[0022] A hydraulic riveting method for a lubricating oil tank dipstick adopts the hydraulic riveting device with a lower die seat as claimed in the preceding claims, and comprises the following steps:

[0023] Step 1: Place the hydraulic riveting device on the workbench of the hydraulic press through the lower die base;

[0024] Step 2: After the oil dipstick to be riveted is assembled with the rivet, the hemispherical groove on the top of the die is used as a reference, the semicircular head of the rivet is aligned with the hemispherical groove and the oil dipstick is installed on the die of the hydraulic riveting device;

[0025] Step 3: Adjust the position of the oil dipstick, place the dipstick body into the installation limit rectangular groove at the top of the die, and place the outer sleeve of the oil dipstick into the installation limit semicircular groove of the die;

[0026] Step 4: Start the hydraulic press to make the main cylinder of the hydraulic press slide down. After the main cylinder contacts the pressure rod of the hydraulic riveting device, it drives the pressure rod to move downward together until the bottom plane of the pressure rod contacts the rivet of the oil dipstick to start riveting. When the pressure rod moves down to the second limit step and reaches the upper plane of the guide plate, it stops and the riveting is completed.

[0027] Step 5: Adjust the hydraulic press to move the master cylinder upwards. The spring installed at the pressure rod will unload the force and reset to push the pressure rod upwards. Then take the oil dipstick out of the hydraulic riveting device. At this time, the riveting is completed.

[0028] Step six: measure the height and diameter of the rivet head after riveting.

[0029] The present invention adopts a hydraulic riveting method, and adopts a lubricating oil tank oil dipstick hydraulic riveting device and a hydraulic press to perform riveting. The oil dipstick is installed on the hydraulic riveting device, and then the oil dipstick and the hydraulic riveting device are placed together on the workbench of the hydraulic press. By starting the hydraulic press, the main cylinder of the hydraulic press slides down and drives the hydraulic riveting device to rivet the oil dipstick rivet.

[0030] Compared with the prior art, the present invention has the following characteristics:

[0031] (1) The hydraulic riveting device for the oil dipstick of the lubricating oil tank is relatively simple to manufacture. The oil dipstick can be clamped quickly during use and is easy to use, which improves the operator's work efficiency.

[0032] (2) The hydraulic riveting device for the oil dipstick of the lubricating oil tank has a high positioning accuracy for the oil dipstick workpiece. During the riveting process, the oil dipstick body and the rivet are not prone to deflection and slanted pier heads. The qualified rate of key dimensions such as the pier head height and diameter after riveting is high. Considering that the criterion for qualified riveting is mainly to judge the riveting quality by using a measuring tool to measure the pier head height and pier head diameter after riveting, the pressure rod will not continue to rivet after it is pressed down to the limit height. Therefore, the height of the rivet after the riveting device is pressed to the bottom by the hydraulic press is fixed and guaranteed by the forming height during design.

[0033] (3) Riveting by hydraulic press can realize riveting multiple rivets on the same plane at one time, especially for riveting multiple rivets with narrow spacing. The efficiency and quality are greatly improved compared with the previous manual riveting and pneumatic riveting. Specifically, two hemispherical grooves are designed on the die for installing semi-circular head rivets. The rivet arrangement range only needs to be smaller than the pressure head area of ​​the pressure rod. When the pressure rod moves downward to the limit position, the riveting of all rivets can be completed. The number of rivets that can be riveted is determined by the area of ​​the bottom of the pressure rod and the spacing of the hemispherical grooves on the die. Therefore, it is suitable for one-time riveting of multiple rivets with narrow spacing. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of a hydraulic riveting device for an oil dipstick of a lubricating oil tank including an oil dipstick;

[0035] Figure 2 for Figure 1 Left view of

[0036] Figure 3 for Figure 1 A top view of

[0037] Figure 4 Schematic diagram of the lower die base;

[0038] Figure 5 for Figure 4 Schematic diagram of the mid-section DD;

[0039] Figure 6 for Figure 4 Schematic diagram of the middle section AA;

[0040] Figure 7 for Figure 4 Schematic diagram of the middle section CC;

[0041] Figure 8 It is the AA section of the die;

[0042] Fig. 9 for Figure 8 Left view of

[0043] Fig.10 for Figure 8 A top view of

[0044] Fig.11 for Fig.10 Middle BB cross section;

[0045] Fig.12 It is a three-dimensional diagram of the concave mold;

[0046] Fig.13 Schematic diagram of the rubber pad;

[0047] Fig.14 for Fig.13 Left view of

[0048] Fig.15 for Fig.13 A top view of

[0049] Fig.16 It is a schematic diagram of a pin;

[0050] Fig.17 for Fig.16 Left view of

[0051] Fig.18 It is a schematic diagram of a screw;

[0052] Fig.19 for Fig.18 Right view of;

[0053] Fig. 20 for Fig.18 A top view of

[0054] Fig.21 is a schematic diagram of a spring;

[0055] Fig. 22 for Fig.21 Left view of

[0056] Fig.23 It is the schematic diagram of the AA section of the compression rod;

[0057] Fig.24 for Fig.23 Left view of

[0058] Fig.25 is a schematic diagram of the guide plate;

[0059] Fig.26 for Fig.25 Schematic diagram of the CC section;

[0060] Fig. 27 for Fig.25 Schematic diagram of the middle AA section;

[0061] Fig.28 It is a schematic diagram of the support seat;

[0062] Fig.29 for Fig.28 Left view of

[0063] Fig.30 for Fig.28 A top view of

[0064] In the figure, 1-lower die base, 2-die, 3-oil dipstick, 4-rubber pad, 5-pin, 6-screw, 7-spring, 8-pressure rod, 9-guide plate, 10-support seat. DETAILED DESCRIPTION

[0065] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0066] like Figure 1 to Figure 3 As shown, a hydraulic riveting device for an oil dipstick of a lubricating oil tank designed by the present invention includes a lower die base 1, a die 2, a rubber pad 4, a pin 5, a screw 6, a spring 7, a pressure rod 8, a guide plate 9 and a support base 10.

[0067] like Figures 4 to 7 As shown, the main body of the lower die base 1 is a rectangular steel plate, which is used as the bottom plate of the entire oil tank oil dipstick hydraulic riveting device. The middle part of the lower die base 1 is provided with hole features along the length axis direction for installing A8×30 pins 5 and M8×25 hexagon socket head screws 6 respectively. The hole feature for installation with the pin 5 is a Φ8 through hole, and the through hole size is an interference fit with the pin 5. The hole feature for installation with the screw 6 is a countersunk hole, and the countersunk hole size is a clearance fit with the screw 6. There are two hole features for installing the pin 5 and the screw 6 respectively, which are symmetrically distributed on the left and right sides. The hole size is consistent with the hole size of the middle part along the length axis direction. As shown Figure 2 As shown, the middle part of the lower die base 1 includes 7 countersunk holes and 6 through holes, which are used to install pins 5 and screws 6 respectively. The countersunk holes and through holes along the longitudinal axis in the middle are used to cooperate with 5 and screws 6 to install the die 2, and the countersunk holes and through holes symmetrically distributed on the left and right sides are used to cooperate with pins 5 and screws 6 to install the support base 10.

[0068] like Figure 8 to Figure 12As shown, the bottom of the die 2 is provided with hole features for A8×30 mounting pin 5 and M8×25 hexagon socket head screw 6 along the longitudinal axis direction, and the die 2 can be fixed on the lower die base 1 through the connection of the pin 5 and the screw 6, wherein the hole feature for mounting with the pin 5 is a Φ8 blind hole, and the blind hole size is in the form of interference fit with the pin 5, and the hole feature for mounting with the screw 6 is a threaded blind hole, and the thread size is consistent with the thread of the screw 6. A hemispherical groove for placing the rivet head of the oil dipstick 3 and a rectangular groove for mounting the rubber pad are provided in the middle position of the top of the die 2. The size of the hemispherical groove is designed according to the head size of the rivet used for the oil dipstick 3. A rectangular groove for mounting the ruler body of the oil dipstick 3 is provided on the left side of the die 2 to prevent the oil dipstick 3 from being offset during the riveting process, and a semicircular groove for mounting the outer sleeve of the oil dipstick 3 is provided on the right side. A picking through groove is also provided on the die 2 and between the installation limit semicircular groove and the hemispherical groove. The picking through groove runs through the two end faces of the die 2 in the width direction. The bottom surface of the picking through groove is lower than the bottom surface of the installation limit semicircular groove. The design of the picking through groove facilitates the operator to reach into the picking through groove to clamp the outer sleeve of the oil dipstick 3 after the riveting process is completed, leaving enough operating space.

[0069] The rubber pad 4 is a rectangular resin made of polyurethane material, which is used to be installed in the installation rubber pad rectangular groove in the middle of the top of the die 2, and is mainly used to increase the buffer for the oil dipstick 3 to prevent crushing. Figure 13 to Figure 15 One side of the end of the rubber pad 4 is semicircular, and the overall outline size can be installed in the installation rubber pad rectangular groove in the middle of the top of the die 2.

[0070] Pin 5 is a cylindrical pin that complies with GB / T119-86 standard, and the size of the cylindrical pin is A8×30; Fig.16 and Fig.17 As shown, the pin 5 is installed at the pin hole of the lower die base 1, and is used to connect the lower die base 1 and the die 2 and the lower die base 1 and the support base 10. The connection and fixing method of the lower die base 1 and the die 2 is to use two YA1.8×18×65 cylindrical pins to pass through the two Φ8 holes at the bottom of the lower die base 1, and then extend into the blind hole at the bottom of the die 2, and then use three M8×25 hexagon socket head screws to pass through the bottom countersunk holes of the lower die base 1, and then extend into the threaded blind holes at the bottom of the support base 10, and tighten the screws to complete the fixation. The connection and fixing method of the lower die base 1 and the support base 10 is to use four YA1.8×18×65 cylindrical pins to pass through the four Φ8 holes at the bottom of the lower die base 1, and then extend into the blind holes at the bottom of the support base 10, and then use four M8×25 hexagon socket head screws to pass through the bottom countersunk holes of the lower die base 1, and then extend into the threaded blind holes at the bottom of the support base 10, and tighten the screws to complete the fixation.

[0071] like Fig.18 , Fig.19 and Fig. 20 , screw 6 is a hexagon socket head screw that complies with GB / T2089-2009 standard, the size of the cylindrical head screw is M8×25, and the head of screw 6 is provided with a hexagon socket feature for assembly with a universal wrench tool. Screw 6 is installed at the countersunk holes of the lower die base 1 and the guide plate 9, and is used to connect the lower die base 1 and the die 2, the lower die base 1 and the support base 10, and the support base 10 and the guide plate 9 respectively. The connection and fixing method of the support base 10 and the guide plate 9 is to use 4 YA1.8×18×65 cylindrical pins to pass through the 4 Φ8 holes at the bottom of the lower die base 1, and then extend into the blind hole at the bottom of the support base 10, and then use 4 M8×25 hexagon socket head screws to pass through the countersunk holes at the bottom of the lower die base 1, and then extend into the threaded blind hole at the bottom of the support base 10, and tighten the screws to complete the fixation.

[0072] The spring 7 is a common cylindrical helical compression spring that complies with the GB / T70-85 standard. The two ends of the spring 7 are tightened and ground flat. The size is YA1.8×18×65. The principle of selecting the spring 7 is that the inner ring diameter is at least 0.5mm larger than the diameter of the sliding limit portion (i.e., the second limit step) of the pressure rod 8 in the hydraulic riveting device, and 5mm smaller than the diameter of the first limit step at the head of the pressure rod 8; Fig.21 and Fig. 22 As shown, the spring 7 is used to be installed in the middle of the pressure rod 8, and the free length of the spring 7 is smaller than the length of the middle of the pressure rod 8.

[0073] The main body of the pressure rod 8 is a cylindrical rod made of chrome-manganese steel. The head of the pressure rod 8 is provided with a first limiting step for installing the spring 7. The size of the first limiting step is at least 5mm larger than the inner diameter of the spring 7. The middle of the pressure rod 8 is provided with a second limiting step. The plane feature at the bottom of the pressure rod 8 is used to form the rivet head. Fig.23 and Fig.24 As shown, the outer circle size of the middle part of the pressure rod 8 is 10 mm larger than the outer circle size of the part where the head extends into the through hole of the guide plate 9.

[0074] like Figure 25 to Figure 27 As shown, the main body of the guide plate 9 is a rectangular steel plate, and a through hole for installing the pressure rod 8 is set in the middle of the guide plate 9. The size of the through hole matches the size of the sliding part of the pressure rod 8 with a small gap. The left and right sides of the guide plate 9 are symmetrically provided with countersunk features for installing M8×25 hexagon socket head screws. The guide plate 9 can be installed on the support seats 10 at the left and right ends through the connection of screws 6. A spring 7 is installed between the pressure rod 8 and the guide plate 9. Its function is to reset the spring when the hydraulic press unloads the force after riveting is completed, and the pressure rod 8 moves upward. At this time, the riveted oil dipstick 3 can be removed.

[0075] like Figure 28 to Figure 30As shown, the bottom of the support seat 10 is provided with hole features for installing the A8×30 pin 5 and the M8×25 hexagon socket head screw 6, wherein the hole feature for installation with the pin 5 is a Φ8 blind hole, the size of the blind hole is in the form of interference fit with the pin 5, and the hole feature for installation with the screw 6 is a threaded blind hole. The top is provided with a threaded blind hole feature for installing the screw 6. The top and bottom surfaces of the support seat 10 are parallel surfaces, which are used for the installation of the guide plate 9 and the lower die seat 1, respectively. After assembly, the flatness of the top and bottom surfaces of the support seat 10 must be ensured.

[0076] The process of riveting using the above-mentioned oil dipstick hydraulic riveting device includes the following steps:

[0077] Step 1: Place the hydraulic riveting device on the workbench of the hydraulic press through the lower die base 1;

[0078] Step 2: After the oil dipstick 3 to be riveted is assembled with the rivet, the hemispherical groove on the top of the die 2 is used as a reference, the semicircular head of the rivet is aligned with the hemispherical groove and the oil dipstick 3 is installed on the die 2 of the hydraulic riveting device;

[0079] Step 3: Adjust the position of the oil dipstick 3, put the oil dipstick body of the oil dipstick 3 into the installation limit rectangular groove on the left side of the top of the die 2, and put the outer sleeve of the oil dipstick 3 into the installation limit semicircular groove on the right side of the die 2 to prevent the oil dipstick 3 from shifting during the riveting process;

[0080] Step 4: Start the hydraulic press, and make the main cylinder of the hydraulic press slide down. After the main cylinder contacts the pressure rod 8 of the hydraulic riveting device, it drives the pressure rod 8 to move downward together, until the bottom plane of the pressure rod 8 contacts the rivet of the oil dipstick 3 to start riveting. When the pressure rod 8 moves down to the second limit step in the middle and reaches the upper plane of the guide plate 9, it stops. At this time, the rivet head can be formed.

[0081] Step 5: Adjust the hydraulic press to move the master cylinder upward, and the spring 7 installed at the pressure rod 8 will be reset after unloading to push the pressure rod 8 upward, and then take the oil dipstick 3 out of the hydraulic riveting device, and the riveting is completed at this time;

[0082] Step 6: Use calipers or other measuring tools to measure the height and diameter of the rivet head after riveting to see if they meet the size requirements.

[0083] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A hydraulic riveting device for a lubricating oil tank dipstick, characterized in that: include: A support seat (10), wherein two support seats (10) are placed in parallel and spaced apart; A die (2) is placed between two support seats (10), the top end surface of the die (2) is provided with a rectangular groove for mounting a dipstick (3) and a semicircular groove for mounting a outer sleeve of the dipstick (3), the top end surface of the die (2) between the rectangular groove and the semicircular groove is also provided with a hemispherical groove for accommodating a rivet head on the oil dipstick (3), and a rectangular groove for mounting a rubber pad is provided on each side of the hemispherical groove; A rubber pad (4), the rubber pad (4) being placed in a rectangular groove for installing the rubber pad; A guide plate (9), the guide plate (9) being located above the die (2), and the two ends of the guide plate (9) being respectively connected to the tops of the two support seats (10), and a through hole being opened on the guide plate (9); A pressure rod (8), the pressure rod (8) is inserted into the through hole of the guide plate (9), a first limiting step is arranged at the upper end of the pressure rod (8), a rivet forming pier head is formed at the lower end of the pressure rod (8) in a plane shape, and a second limiting step is arranged on the pressure rod (8) and between the first limiting step and the rivet forming pier head; A spring (7) is sleeved on a pressure rod (8), and one of the two axial end faces of the spring (7) is in close contact with a first limiting step on the head of the pressure rod (8), and the other end face is in close contact with a top end face of a guide plate (9).

2. The hydraulic riveting device for the oil dipstick of a lubricating oil tank according to claim 1, characterized in that: It also includes a lower die base (1), which serves as the bottom plate of the entire hydraulic riveting device and is connected to the working platform of the hydraulic device. The main body of the lower die base (1) is a rectangular steel plate, and the bottom of the support base (10) and the die (2) are both installed on the lower die base (1).

3. The hydraulic riveting device for the oil dipstick of a lubricating oil tank according to claim 2, characterized in that: The lower die base (1) is provided with a first pin hole and a first screw hole, wherein the first pin hole is a through hole and the first screw hole is a countersunk hole; The bottom of the die (2) is provided with a second pin hole and a second screw hole, wherein the second pin hole and the second screw hole are both blind holes; The bottom of the support seat (10) is provided with a third pin hole and a third screw hole, wherein the third pin hole and the third screw hole are both blind holes; The die (2) is connected to the lower die base (1) via a pin (5) located in a first pin hole and a second pin hole and a screw (6) located in a first screw hole and a second screw hole, and the support base (10) is connected to the lower die base (1) via a pin (5) located in a first pin hole and a third pin hole and a screw (6) located in a first screw hole and a third screw hole.

4. The hydraulic riveting device for the oil dipstick of a lubricating oil tank according to claim 3, characterized in that: The pin (5) is a cylindrical pin that complies with the GB / T119-86 standard, and the screw (6) is a hexagon socket head screw that complies with the GB / T2089-2009 standard.

5. The hydraulic riveting device for the oil dipstick of a lubricating oil tank according to claim 1, characterized in that: A through groove for picking up objects is also provided on the die (2) and between the installation limiting semicircular groove and the hemispherical groove. The through groove for picking up objects runs through two end faces in the width direction of the die (2). The bottom surface of the through groove for picking up objects is lower than the bottom surface of the installation limiting semicircular groove.

6. The hydraulic riveting device for the oil dipstick of a lubricating oil tank according to claim 1, characterized in that: The top end surface of the support seat (10) is provided with a threaded blind hole, the guide plate (9) is provided with a threaded through hole, and the guide plate (9) is connected to the top of the support seat (10) by means of screws (6) screwed into the threaded through hole and the threaded blind hole.

7. Hydraulic riveting method for oil dipstick of lubricating oil tank, characterized in that: The hydraulic riveting device according to claim 2 is used, and includes the following steps: Step 1: placing the hydraulic riveting device on the workbench of the hydraulic press through the lower die base (1); Step 2: After the oil dipstick (3) to be riveted is assembled with the rivet, the hemispherical groove at the top of the die (2) is used as a reference, the semicircular head of the rivet is aligned with the hemispherical groove, and the oil dipstick (3) is installed on the die (2) of the hydraulic riveting device; Step 3: adjust the position of the oil dipstick (3), place the oil dipstick body of the oil dipstick (3) into the installation limit rectangular groove at the top of the die (2), and place the outer sleeve of the oil dipstick (3) into the installation limit semicircular groove of the die (2); Step 4, start the hydraulic press, make the main cylinder of the hydraulic press slide down, and after the main cylinder contacts the pressure rod (8) of the hydraulic riveting device, drive the pressure rod (8) to move downward together, until the bottom plane of the pressure rod (8) contacts the rivet of the oil dipstick (3) to start riveting, and when the pressure rod (8) moves down to the second limit step and reaches the upper plane of the guide plate (9), it stops, and the riveting forming is completed; Step 5: Adjust the hydraulic press to move the master cylinder upward, and the spring (7) installed at the pressure rod (8) is reset after unloading to push the pressure rod (8) upward, and then remove the oil dipstick (3) from the hydraulic riveting device, and the riveting is completed at this time; Step six: measure the height and diameter of the rivet head after riveting.

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