Cylindrical helical compression spring shot peening strengthening machining device and method

Abstract

The invention relates to the technical field of spring type elastic element machining, in particular to a cylindrical helical compression spring shot peening strengthening machining device and method. A shot blasting base; shot blasting and plate pressing; a shot blasting machine mounting seat; a shot blasting supporting seat; the shot-blasting supporting seat is mounted on the shot-blasting machine mounting seat, the shot-blasting base is mounted on the shot-blasting supporting seat, the shot-blasting pressing plate is mounted on the shot-blasting base, the shot-blasting pressing plate is connected with the shot-blasting machine mounting seat and presses the shot-blasting base and the shot-blasting supporting seat, and the mandrel is arranged on the shot-blasting base; the spring shot blasting device meets the production mode of aviation products, is suitable for small batches and multiple varieties, can prolong the service life of springs by several times or even dozens of times, and has the functions of quick replacement and shot blasting of springs of multiple specifications.

Description

Technical Field

[0001] The invention relates to the technical field of processing spring elastic elements, and in particular to a shot peening strengthening processing device and method for a cylindrical spiral compression spring. Background Art

[0002] Large diameter cylindrical helical compression springs are prone to fatigue fracture during product use. The reason is that the larger the size of the raw material, the higher the possibility of defects caused by various cold working and hot working processes, and the greater the possibility of surface defects. This leads to a relatively low life of large diameter cylindrical helical compression springs. The shot peening process can effectively increase the service life of the spring.

[0003] In aviation products, the cylindrical spiral compression bullets used have various structural shapes; their production and processing mode is small batch and multi-variety. According to the traditional processing method, on the one hand, the shot peening process is to fix the spring with a process device, resulting in a large deformation of the spring size caused by the force generated by the projectile during the spring shot peening process; on the other hand, the device structure used for shot peening is relatively complex, and each type of shot peening device is suitable for springs of one specification and does not have a fast replacement function. Therefore, a spring shot peening strengthening processing device and method that can meet multiple specifications and has fast replacement is needed. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the existing processing technology and provide a cylindrical spiral compression spring shot peening strengthening processing device and method to meet the production mode of aviation products and be suitable for small batches and multiple varieties. The present invention can increase the life of the spring by several times or even dozens of times, and at the same time it has the function of fast replacement and meeting the shot peening of springs of multiple specifications.

[0005] Technical solution:

[0006] A shot peening strengthening processing device for a cylindrical spiral compression spring includes a core shaft; a shot peening base; a shot peening pressure plate; a shot peening machine mounting seat; and a shot peening support seat; the shot peening support seat is installed on the shot peening machine mounting seat, the shot peening base is installed on the shot peening support seat, the shot peening pressure plate is installed on the shot peening base, the shot peening pressure plate is connected to the shot peening machine mounting seat, and the shot peening base and the shot peening support seat are pressed, and the core shaft is arranged on the shot peening base.

[0007] Furthermore, the shot peening pressure plate is connected to the shot peening machine mounting seat through shot peening fixing screws and is locked through shot peening fixing nuts.

[0008] Furthermore, the shot peening base is provided with a plurality of mounting hole groups distributed along the circumference, and the distances from the mounting holes in each mounting hole group to the center of the circle are equal.

[0009] Furthermore, an annular fixed step is provided on the top of the shot peening base, which is installed in coordination with the step on the lower surface of the shot peening pressure plate.

[0010] Furthermore, the center line of the shot peened base coincides with the center line of the spring.

[0011] Furthermore, the material of the core shaft, the shot peening base, the shot peening fixing screws, and the shot peening pressure plate is consistent with the material of the shot peening projectiles to prevent the shot peening projectiles from being contaminated.

[0012] Furthermore, the shot peening support seat includes a plurality of shot peening support seats of different heights. By cooperating with the shot peening support seats of different heights, the height of the spring on the device can be adjusted so that the spring is located within the shot peening range of the nozzle.

[0013] The method for shot peening a cylindrical helical compression spring using the shot peening processing device is as follows: the nozzle of the shot peening machine is aimed at the cylindrical helical compression spring for shot peening, the spraying angle is 0°, the distance between the nozzle of the shot peening machine and the center line 303 of the spring is adjusted to 300 mm, the shot peening pressure of the shot peening machine is 0.3 MPa, and the shot flow rate of the shot peening machine is 8.5 kg / min; the rotation speed of the mounting seat of the shot peening machine is 10 r / min and the vertical direction speed of the nozzle of the shot peening machine is set to 660 mm / min, and these two parameters need to be used in combination; the lowest point of the movement stroke of the nozzle of the shot peening machine in the vertical direction is lower than the lowest point of the spring in the device, and the highest point is higher than the highest point of the spring in the device.

[0014] Beneficial effects:

[0015] Provided is a shot peening strengthening processing device and method for cylindrical spiral compression springs. On the one hand, the spring can be in an active state during the shot peening process, minimizing the impact of the shot peening projectile on the spring size; on the other hand, it can meet the production mode of aviation products and is suitable for small batches and multiple varieties. The shot peening process should increase the life of the spring by several times or even dozens of times, and at the same time it has the function of rapid replacement and shot peening of springs of multiple specifications, so as to meet the production mode of aviation products and is suitable for small batches and multiple varieties. The shot peening process can increase the life of the spring by several times or even dozens of times, and at the same time it has the function of rapid replacement and shot peening of springs of multiple specifications, so as to meet the production mode of aviation products and is suitable for small batches and multiple varieties. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. It is obvious that the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a schematic diagram of the structure of the shot peening processing device;

[0018] Figure 2 This is a schematic diagram of the shot peening base structure;

[0019] In the figure:

[0020] 1—shot peening machine nozzle; 2—mandrel; 3—shot peening base; 301—mounting hole; 302—fixing step; 303—spring center line; 4—shot peening fixing screw; 5—shot peening pressure plate; 6—shot peening machine mounting seat; 7—shot peening support seat; 8—shot peening fixing nut; 9—lowest point of spring; 10—spring to be shot peened; 11—highest point of spring. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is by no means limited to any specific settings and methods proposed below, but covers any improvements, replacements and modifications of structures, methods, devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary ambiguity in the present invention.

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] One embodiment of the present invention provides a cylindrical helical compression spring shot peening strengthening processing device, including a core shaft 2; a shot peening base 3; a shot peening pressure plate 5; a shot peening machine mounting seat 6; a shot peening support seat 7; the shot peening support seat 7 is installed on the shot peening machine mounting seat 6, the shot peening base 3 is installed on the shot peening support seat 7, the shot peening pressure plate 5 is installed on the shot peening base 3, the shot peening pressure plate 5 is connected to the shot peening machine mounting seat 6 through a shot peening fixing screw 4, and is locked by a shot peening fixing nut 8, thereby pressing the shot peening base 3 and the shot peening support seat 7, and the core shaft 2 is arranged on the shot peening base 3.

[0025] Among them, the shot peening base 3 is provided with a plurality of mounting hole groups distributed along the circumference, and the distance from the mounting hole 301 on each mounting hole group to the center of the circle is equal. Circularly distributed core shafts 2 with different diameters can be arranged in holes of different mounting groups. An annular fixed step is provided on the top of the shot peening base 3, which is installed in coordination with the step on the lower surface of the shot peening pressure plate 5.

[0026] The center line of the shot peening base 3 coincides with the center line 303 of the spring, ensuring that after the cylindrical helical compression spring is installed, the cylindrical helical compression spring is stable and will not fall from the shot peening base 3 .

[0027] The material of the core shaft 2, the shot peening base 3, the shot peening fixing screw 4, and the shot peening pressure plate 5 is consistent with the material of the shot peening projectile to prevent the shot peening projectile from being contaminated.

[0028] The shot peening support seat 7 includes a plurality of shot peening support seats 7 with different heights. By cooperating with the shot peening support seats 7 with different heights, the height of the spring on the device can be adjusted so that the spring is located within the shot peening range of the nozzle 1 .

[0029] The installation method of the shot peening device is as follows: the shot peening support seat 7 is placed at the center of the shot peening machine mounting seat 6, and the shot peening base 3 is installed on the shot peening support seat 7 to ensure that the axes of the two are concentric; the shot peening pressure plate 5 is installed at the fixed step 302 position in the shot peening base, and is fixed by the shot peening fixing screw 4 and the shot peening fixing nut 8. Through the above installation method, the process device is firmly fixed on the shot peening machine mounting seat 6. When the shot peening machine mounting seat 6 rotates, it will drive the shot peening process device to rotate together and keep the rotation speed consistent.

[0030] According to the structure of the spring 10 to be shot peened, three core shafts 2 are selected and installed in the holes 301 of the shot peening base 3. The maximum outer circle formed by the core shafts 2 is (5 to 10) mm smaller than the inner diameter of the spring 10 to be shot peened, so as to ensure that the spring 10 to be shot peened can move freely during the shot peening process, so that the force of the shot peening pressure on the deformation of the spring outer diameter can be released, thereby ensuring that the change in the spring outer diameter is reduced.

[0031] Place the spring 10 to be shot peened on the three mandrels 2 to ensure that the spring is in a free state. Shot peen the spring 10 to be shot peened according to the above parameters. After the spring is shot peened, the surface coverage of the spring can reach 100%. Rotate the spring 180° and place it on the three mandrels 2. Shot peen it again according to the above shot peening process to ensure that the surface coverage of the spring is 200% and the shot peening intensity is met. After the spring is shot peened, the spring should be cleaned up at the tightening position to ensure that the shot peening projectiles are removed cleanly to avoid the generation of excess materials.

[0032] The second embodiment of the present invention provides a method for shot peening a cylindrical helical compression spring using the shot peening device:

[0033] First, set the parameters as specified in the following table:

[0034] Projectile Requirements Specifications Projectile Specifications 0.18mm Spray Angle 0° Spray distance 300mm Shot peening pressure 0.3MPa Projectile flow 8.5Kg / min Rotation speed 10r / min Z-axis speed 660mm / min Cycle times 6

[0035] The spray angle of the shot peening machine nozzle 1 is selected to be 0°, that is, in a horizontal state. The advantage is that when the spray is at a certain angle, the high-speed projectile hits the spring surface, which will produce a force on the spring, causing the length of the spring to be affected, resulting in a change in the spring length and a length deviation of the part. The distance between the shot peening machine nozzle 1 and the spring centerline 303 is adjusted to 300mm, so that when the projectile leaves the nozzle, it can achieve the maximum area "evacuation" and be evenly sprayed on the spring surface. Too short or too long will cause the projectiles to "evacuate" or "evacuate" excessively, resulting in uneven surface shot peening or local over-peening (loss of shot peening effect and adverse consequences: such as surface peeling, deformation, etc.); the shot peening pressure of the shot peening machine is set to 0.3MPa, the purpose is to ensure the shot peening strength of the spring; the shot peening machine projectile flow rate is set to 8.5Kg / min, the purpose is to ensure the shot peening strength of the spring; the rotation speed of the shot peening machine mounting seat 6 is set to 10r / min and the Z-axis speed of the shot peening machine nozzle 1 is set to 660min. These two parameters need to be used in conjunction with the purpose of making the spring rotate evenly and making the outer surface evenly covered by the projectiles. Too high or too low will lead to uneven shot peening or local over-peening (loss of shot peening effect and adverse consequences: such as surface peeling, deformation, etc.); the lowest point of the movement stroke of the shot peening machine nozzle 1 on the Z axis should be lower than the lowest point 9 of the spring in the process device, and the highest point should be higher than the highest point 11 of the spring in the process device, the purpose is to ensure that all outer surfaces of the spring can be covered by the projectiles and ensure the shot peening coverage rate.

[0036] The cylindrical helical compression spring shot peening strengthening processing device and method provided by the present invention can, on the one hand, keep the spring in an active state during the shot peening process, thereby minimizing the impact of the shot peening projectile on the spring size; on the other hand, it can meet the production mode of aviation products and is suitable for small batches and multiple varieties. The shot peening process should increase the life of the spring by several times or even dozens of times, and at the same time, it has the function of fast replacement and meeting the shot peening of springs of multiple specifications, so as to meet the production mode of aviation products and is suitable for small batches and multiple varieties.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A shot peening strengthening device for cylindrical helical compression springs, characterized in that: It includes a core shaft; a shot peening base; a shot peening pressure plate; a shot peening machine mounting seat; a shot peening support seat; the shot peening support seat is installed on the shot peening machine mounting seat, the shot peening base is installed on the shot peening support seat, the shot peening pressure plate is installed on the shot peening base, the shot peening pressure plate is connected to the shot peening machine mounting seat, and the shot peening base and the shot peening support seat are pressed tightly, and the core shaft is arranged on the shot peening base.

2. A cylindrical helical compression spring shot peening device according to claim 1, characterized in that: The shot peening pressure plate is connected to the shot peening machine mounting seat through shot peening fixing screws and is locked through shot peening fixing nuts.

3. The shot peening strengthening device for cylindrical helical compression spring according to claim 1, characterized in that: A plurality of mounting hole groups distributed along the circumference are arranged on the shot peening base, and the distances from the mounting holes on each mounting hole group to the center of the circle are equal.

4. The shot peening strengthening device for cylindrical helical compression spring according to claim 3, characterized in that: A circular fixed step is arranged on the top of the shot peening base, which is installed in coordination with the step on the lower surface of the shot peening pressure plate.

5. The shot peening strengthening device for cylindrical helical compression spring according to claim 3, characterized in that: The center line of the shot peened base coincides with the center line of the spring.

6. The shot peening strengthening device for cylindrical helical compression spring according to claim 2, characterized in that: The material of the core shaft, the shot peening base, the shot peening fixing screws, and the shot peening pressure plate is consistent with the material of the shot peening projectile to prevent the shot peening projectile from being contaminated.

7. The shot peening strengthening device for cylindrical helical compression spring according to claim 2, characterized in that: The shot peening support seat includes a plurality of shot peening support seats with different heights. With the shot peening support seats with different heights, the height of the spring on the device can be adjusted so that the spring is located within the shot peening range of the nozzle.

8. A method for shot peening a cylindrical helical compression spring using the shot peening apparatus as claimed in any one of claims 1 to 7, characterized in that: The shot peening machine nozzle is aimed at the cylindrical spiral compression spring for shot peening, the spraying angle is 0°, the distance between the shot peening machine nozzle and the spring center line 303 is adjusted to 300mm, the shot peening pressure of the shot peening machine is 0.3MPa, and the shot flow rate of the shot peening machine is 8.5Kg / min; the rotation speed of the shot peening machine mounting seat is 10r / min and the vertical speed of the shot peening machine nozzle is set to 660mm / min, and these two parameters need to be used in conjunction; the lowest point of the vertical movement stroke of the shot peening machine nozzle is lower than the lowest point of the spring in the device, and the highest point is higher than the highest point of the spring in the device.

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