A kind of blind hole type part strengthening shot blasting gun and its shot blasting method

Abstract

The application discloses a kind of blind hole class parts strengthening shot blasting's spray gun, including lance, spray head, first flow valve, bypass connecting pipe, second flow valve;The lance is hollow cylindrical structure;The lower end of lance and spray head fixed connection;The upper end of lance connects shot conveying device;And the first flow valve is set in the upper end of lance;Bypass connecting pipe is arranged on the lateral wall of lance;The bypass connecting pipe is connected with shot recovery device;Second flow valve is set on the bypass connecting pipe.The application also discloses the method for strengthening shot blasting of blind hole class parts using the above-mentioned spray gun.The application controls the relationship between shot blasting nozzle flow and shot accumulation amount in blind hole, so as to ensure the normal implementation of blind hole class parts inner wall strengthening shot blasting work and the stability of shot blasting strength.

Description

Technical Field

[0001] This invention belongs to the field of shot peening for strengthening the inner wall of blind hole parts, and in particular relates to a shot peening gun and shot peening method for strengthening blind hole parts. Background Technology

[0002] Shot peening involves repeatedly striking a material surface with a high-speed stream of shot, causing significant plastic deformation of the material's surface. This ultimately creates a hardened layer on the material surface, effectively improving the fatigue life and stress corrosion resistance of components.

[0003] The best strengthening effect can only be achieved by properly matching the shot peening equipment, shot medium, and shot peening process parameters.

[0004] When shot peening the inner walls of blind-hole parts, the limitations of the blind holes prevent the shot from being removed quickly, and the incident and reflected shot interfere with each other, resulting in reduced shot peening efficiency. The incident shot stream should strike the inner wall of the space at a certain angle, and space should be reserved for the reflected shot stream to minimize interference between the incident and reflected streams. A certain distance should be maintained between the nozzle and the shot-peened surface of the part, generally on the order of several centimeters to tens of centimeters. This will minimize interference between the reflected and incident shot, ensure efficient kinetic energy utilization, and improve shot peening efficiency.

[0005] If, during shot peening, the bottom of the blind hole on the part is positioned upwards, the shot needs to be sprayed upwards. To avoid the reflected flow affecting the incident flow, the incident flow must have a certain angle. If the bottom of the blind hole is positioned downwards, the shot is sprayed downwards, and the shot will quickly fill the internal cavity of the part, resulting in a shortened effective shot peening time.

[0006] Meanwhile, the inner diameter of the parts limits the size of the shot peening nozzle, thus restricting the shot peening effect. For blind hole parts with a diameter less than 30mm, high-efficiency shot peening is a topic worthy of further research.

[0007] Chinese patent application 201710941813.4, entitled "A Shot Peening Gun and Method for Strengthening Blind Holes with High Aspect Ratios," discloses a shot peening gun and method suitable for strengthening blind holes with high aspect ratios in aerospace parts. The shot peening gun of this invention includes an inner tube, an outer tube, a gun head, an outer cylinder, an inclined tube, and a connecting cylinder. The strengthening steps of this patent application are: installing the shot peening gun; and shot peening. It specifically proposes a shot peening gun and method suitable for strengthening blind holes with high aspect ratios in aerospace parts, solving the problem of shot clogging in blind holes with high aspect ratios in aerospace parts, and meeting the need to eliminate fatigue stress concentration and improve fatigue resistance of aerospace parts. The drawback of this technology is that although the nozzle arrangement has two pipes, one for shot peening and the other for recovering the shot using negative pressure, the arrangement is limited, resulting in the shot being too close to the inner wall of the part, only a few to tens of millimeters, leading to low kinetic energy transfer and low shot peening intensity. Furthermore, the arrangement of two sets of pipelines within a single nozzle further restricts the nozzle's diameter, effectively halving its diameter and preventing the nozzle from being made finer. The halved effective nozzle diameter also reduces the shot flow rate by three-quarters, significantly decreasing shot peening efficiency.

[0008] Therefore, there is an urgent need to find a shot blasting gun and a shot blasting method for strengthening blind hole parts. Summary of the Invention

[0009] The first technical problem to be solved by the present invention is to provide a shot peening gun for strengthening blind hole parts; the present invention ensures the normal implementation of shot peening for strengthening the inner wall of blind hole parts and the stability of shot peening intensity by controlling the relationship between the shot peening nozzle flow rate and the amount of shot accumulated in the blind hole.

[0010] The second technical problem to be solved by the present invention is to provide a method for shot peening blind hole parts using the above-mentioned spray gun.

[0011] To solve the first technical problem mentioned above, the invention adopts the following technical solution:

[0012] A shot peening gun for strengthening blind hole type parts includes:

[0013] Spear, nozzle, first flow valve, bypass connection pipe, second flow valve;

[0014] The spear has a hollow cylindrical structure;

[0015] The lower end of the spear and the nozzle are fixedly connected;

[0016] The upper end of the spear is connected to a pellet conveying device; and a first flow valve is provided at the upper end of the spear.

[0017] A bypass connection pipe is provided on the side wall of the spear; and the bypass connection pipe is connected to the pellet recovery device.

[0018] A second flow valve is installed on the bypass connection pipe.

[0019] To solve the second technical problem mentioned above, the invention adopts the following technical solution:

[0020] The method for shot peening blind hole parts using the above-mentioned spray gun includes the following steps:

[0021] 1) Open the first flow valve, close the second flow valve, and begin normal shot peening operation;

[0022] 2) When too many pellets accumulate in the blind hole, affecting the shot peening effect, record the current nozzle position A, close the first flow valve, open the second flow valve, and at the same time control the nozzle of the spear gun to gradually move towards the blind hole end of the part. Through the negative pressure from the bypass connection pipe, the pellets in the blind hole are sucked out and transferred to the pellet recovery device.

[0023] 3) After the shot particles that would affect the next step of shot peening are sucked out of the blind hole, close the second flow valve; move the nozzle of the spear gun to position A before the shot particles are cleaned, open the first flow valve, and continue the shot peening operation;

[0024] 4) Alternate between steps 2) and 3) until all shot peening work in the blind holes is completed.

[0025] As one implementation method, step 2) specifically involves: defining the area to be shot-peened on the blind hole part as a cylinder with an inner diameter of D; and determining the shot flow rate as Q. 喷 Inner diameter D, pellet density ρ, nozzle moving speed V 移 and shot peening time t 喷 Calculate the pellet buildup height H inside the part's cavity. 堆 and pellet stacking velocity V 堆 The calculation formula is as follows:

[0026] H 堆 =[Q 喷 / ρ]*[4 / (π*D 2 )]*t 喷 ;

[0027] V 堆 =H 堆 / t 喷 ;

[0028] Let the distance from the nozzle to the bottom of the blind hole be H. 底 ;

[0029] If H 底 ≥H 堆 +L 工 This indicates that the location of the shot accumulation did not affect the working distance L between the nozzle and the surface to be shot-blasted. 工To carry out shot peening work;

[0030] If H 底 <H 堆 +L 工 This indicates that the location of the shot accumulation affects the working distance L between the nozzle and the surface to be shot-blasted. 工 Then, pellet cleaning is required.

[0031] In one implementation, during step 2), when cleaning the pellets, the nozzle needs to be moved from its current position A to H. 堆 Given a location B and a required time t, 降 Then begin the cleaning process. After cleaning, the nozzle needs to return to position A. Let the required time be t. 升 ;

[0032] Based on pellet recovery rate Q 回 Pellet recovery flow rate V 回 and t 降 t 升 The working time t2 for the second flow valve to open can be obtained as follows:

[0033] t2=Q 回 / V 回 +t 降 +t 升

[0034] Based on the distance H from position A to the bottom of the blind hole 底 The working distance L between the nozzle and the shot-peened surface 工 And pellet stacking velocity V 堆 and nozzle movement speed V 移 The allowable working time t1 for the next shot peening can be calculated.

[0035] t1 = (H) 底 -L 工 ) / (V 堆 -V 移 ).

[0036] As one implementation, in step 2), if shot peening begins initially from the blind hole position, because the shot accumulation velocity V 堆 > Nozzle movement speed V 喷 This results in the inability to guarantee the working distance L between the nozzle and the shot-peened surface. 工 At this point, a minimum working distance L between the nozzle and the shot-peening surface can be set according to the shot-peening requirements. 工min L 工 With L 工min There is a certain distance between them, which is H. 堆 The buffer is used to perform the shot peening and cleaning operations described above;

[0037] If L工 With L 工min If the distance between them is insufficient for buffering, or if the shot peening and shot removal time is too short, or if the switching frequency of solenoid valve one and solenoid valve two is too high, resulting in difficulty in achieving process feasibility or poor economic efficiency, then the distance L between the blind holes... 工 Strengthening within a distance requires other processes or shot peening solutions; for example, arranging blind holes of the parts downwards and peening with shot upwards, etc.

[0038] Waiting for H 底 ≥L 工 At this time, you can press L. 工 Normal shot peening begins at the distance.

[0039] In one implementation, the switching of the first flow valve and the second flow valve can be controlled manually or automatically by a computer, and the first flow valve and the second flow valve are electromagnetic flow valves.

[0040] The above description is based on the scenario where the nozzle is pointing downwards, the blind holes are pointing upwards, and the pellets accumulate the fastest.

[0041] Any range described in this invention includes the endpoint, any value between the endpoints, and any subrange consisting of the endpoint or any value between the endpoints.

[0042] Unless otherwise specified, all raw materials used in this invention can be obtained commercially, and the equipment used in this invention can be conventional equipment in the relevant field or refer to existing technology in the relevant field.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1) This invention ensures the normal implementation of shot peening for strengthening the inner wall of blind hole parts and the stability of shot peening intensity by controlling the relationship between the shot peening nozzle flow rate and the amount of shot accumulated in the blind hole;

[0045] 2) This formula can be used for conventional pneumatic shot peening, as well as wet shot peening;

[0046] 3) This invention does not require modification of existing nozzles and spear guns, thus ensuring the technological advancement of the spear guns, nozzles, and shot peening process;

[0047] 4) This invention is a supplement to existing blind hole shot peening strengthening methods;

[0048] 5) This invention adds two flow valves and a bypass shot cleaning and recovery circuit to the ordinary spray gun, resulting in low system cost, simple operation, and high safety; it can be applied to various blind hole parts, hollow parts, and pipe fittings.

[0049] 6) This invention has no special requirements for shot; it can ensure the stability of shot peening intensity; it also has no special requirements for spear guns or nozzles, and is suitable for shot peening the inner wall of blind hole parts with small inner diameter. It is even more effective for strengthening the shot peening of the inner wall of blind hole parts using miniature spear guns. Attached Figure Description

[0050] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0051] Figure 1 This is a schematic diagram of the spray gun structure of the present invention. Detailed Implementation

[0052] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments, further clarifies the invention. Those skilled in the art should understand that the specific descriptions below are illustrative rather than restrictive, and should not be construed as limiting the scope of protection of the present invention.

[0053] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0054] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0056] As one aspect of the present invention, see Figure 1 As shown, the present invention provides a shot peening gun for strengthening blind hole type parts, comprising:

[0057] 1. Spear gun; 2. Nozzle; 3. First flow valve; 4. Bypass connection pipe; 5. Second flow valve;

[0058] The spear 1 has a hollow cylindrical structure;

[0059] The lower end of the spear 1 and the nozzle 2 are fixedly connected;

[0060] The upper end of the spear 1 is connected to a pellet conveying device 6 (not shown in the figure); and a first flow valve 3 is provided at the upper end of the spear 1.

[0061] The side wall of the spear 1 is provided with a bypass connection pipe 4; and the bypass connection pipe 4 is connected to the pellet recovery device (not shown in the figure);

[0062] The bypass connection pipe 4 is equipped with a second flow valve 5.

[0063] As another aspect of the present invention, the present invention provides a shot peening method for strengthening blind hole-type parts using the above-described spray gun, comprising the following steps:

[0064] 1) Open the first flow valve, close the second flow valve, and begin normal shot peening operation;

[0065] 2) When too many pellets accumulate in the blind hole, affecting the shot peening effect, record the current nozzle position A, close the first flow valve, open the second flow valve, and at the same time control the nozzle of the spear gun to gradually move towards the blind hole end of the part. Through the negative pressure from the bypass connection pipe, the pellets in the blind hole are sucked out and transferred to the pellet recovery device.

[0066] 3) After the shot particles that would affect the next step of shot peening are sucked out of the blind hole, close the second flow valve; move the nozzle of the spear gun to position A before the shot particles are cleaned, open the first flow valve, and continue the shot peening operation;

[0067] 4) Alternate between steps 2) and 3) until all shot peening work in the blind holes is completed.

[0068] Move the nozzle of the spear gun to position A before cleaning the shot, close the second flow valve, open the first flow valve, and continue the enhanced shot peening operation;

[0069] 4) Alternate between steps 2) and 3) until all shot peening work in the blind holes is completed.

[0070] In some embodiments, step 2) specifically involves: defining the area to be shot-peened on the blind hole part as a cylinder with an inner diameter of D; and determining the shot flow rate as Q. 喷 Inner diameter D, pellet density ρ, nozzle moving speed V 移 and shot peening time t 喷 Calculate the pellet buildup height H inside the part's cavity. 堆 and pellet stacking velocity V 堆 The calculation formula is as follows:

[0071] H 堆 =[Q 喷 / ρ]*[4 / (π*D 2 )]*t 喷 ;

[0072] V 堆 =H 堆 / t 喷 ;

[0073] Let the distance from the nozzle to the bottom of the blind hole be H. 底 ;

[0074] If H 底 ≥H 堆 +L 工 This indicates that the location of the shot accumulation did not affect the working distance L between the nozzle and the surface to be shot-blasted. 工 To carry out shot peening work;

[0075] If H 底 <H 堆 +L 工 This indicates that the location of the shot accumulation affects the working distance L between the nozzle and the surface to be shot-blasted. 工 Then, pellet cleaning is required.

[0076] In some embodiments, in step 2), when cleaning the pellets, the nozzle needs to be moved from its current position A to H. 堆 Given a location B and a required time t, 降 Then begin the cleaning process. After cleaning, the nozzle needs to return to position A. Let the required time be t. 升 ;

[0077] Based on pellet recovery rate Q 回 Pellet recovery flow rate V 回 and t 降 t 升 The working time t2 for the second flow valve to open can be obtained as follows:

[0078] t2=Q 回 / V 回 +t 降 +t 升

[0079] Based on the distance H from position B to the bottom of the blind hole 底 Working distance L between the nozzle and the shot-peened surface 工 and pellet stacking velocity V 堆 The allowable working time t1 for the next shot peening can be calculated;

[0080] t1 = (H) 底 -L 工 ) / (V 堆 -V 移 ).

[0081] In some embodiments, in step 2), if shot peening initially starts from the blind hole position, because the shot accumulation velocity V 堆 > Nozzle movement speed V 喷 This results in the inability to guarantee the working distance L between the nozzle and the shot-peened surface. 工 At this point, a minimum working distance L between the nozzle and the shot-peening surface can be set according to the shot-peening requirements. 工min L 工 With L 工min There is a certain distance between them, which is H. 堆 The buffer is used to perform the shot peening and cleaning operations described above;

[0082] If L 工 With L 工min If the distance between them is insufficient for buffering, or if the shot peening and shot removal time is too short, or if the switching frequency of solenoid valve one and solenoid valve two is too high, resulting in difficulty in achieving process feasibility or poor economic efficiency, then the distance L between the blind holes... 工 Strengthening within a distance requires other processes or shot peening solutions; for example, arranging blind holes of the parts downwards and peening with shot upwards, etc.

[0083] Waiting for H 底 ≥L 工 At this time, you can press L. 工 Normal shot peening begins at the distance.

[0084] In some embodiments, the switching of the first flow valve and the second flow valve can be manually controlled or automatically controlled by a computer, and the first flow valve and the second flow valve are electromagnetic flow valves.

[0085] The above description is based on the scenario where the nozzle is pointing downwards, the blind holes are pointing upwards, and the pellets accumulate the fastest.

[0086] Due to differences in shot density among different materials, varying shot flow rates required for different strengthening processes, and differences in the inner diameter of the parts, the rate at which shot accumulates within the part's internal cavity varies. Commonly used shot materials include steel shot, stainless steel shot, and aluminum shot, as well as zinc shot, ceramic shot, glass shot, and nylon shot; the density of steel shot and stainless steel shot is approximately 7.8 kg / cm³. 3 The density of aluminum shot is approximately 2.7 kg / cm³. 3 The density of glass pellets is approximately 2.5 kg / cm³. 3 The density of ceramic pellets is between 2.4 and 2.9 kg / cm³. 3 The density of nylon pellets is between 1.04 and 1.36 kg / cm³. 3 .

[0087] Taking the shot peening arrangement of blind hole parts, with the blind hole at the bottom and the shot nozzle pointing vertically downwards, as an example, Tables 1, 2, and 3 below show the accumulation rate V of shot inside the part under different shot flow rates and different part inner diameters using steel shot, aluminum shot, and nylon shot. 丸 If the nozzle moves at a speed V during operation... 喷 It must be greater than or equal to the pellet accumulation rate V 丸 Shot peening can be carried out continuously. However, in most cases, the nozzle movement speed V... 喷 Both are less than the accumulation rate V of the pellets. 丸 Therefore, shot peening and shot removal should be performed alternately. Initially, the frequency of alternation will be relatively high, but as the shot peening process progresses, the distance H between the nozzle and the bottom of the blind hole will decrease. 底 It will get bigger and bigger, and the frequency of alternation will decrease significantly.

[0088] Table 1. Steel shot accumulation rate V inside the part 堆 Unit: cm / s

[0089]

[0090] Table 2. Aluminum shot accumulation rate V inside the part 堆

[0091] Unit: cm / s

[0092]

[0093] Table 3. Nylon shot accumulation rate V inside the part 堆

[0094] Unit: cm / s

[0095]

[0096] If the shot peening nozzle is horizontal or downward when the part is shot peened, the amount of shot accumulation will be much less than when the nozzle is downward. The shot may even fall automatically along the inner wall of the part. However, considering the complexity of the internal structure of the part, this invention is mainly applied to scenarios where shot accumulation exists. Shots that can fall and be discharged completely automatically are not discussed.

[0097] This invention ensures uniformity and enhances shot peening intensity by controlling the accumulation of shot within blind holes. Since no modification is required to the existing nozzle, the advanced technology of the existing nozzle and the advanced shot peening process can be guaranteed. It is especially suitable for shot peening with small orifice diameters.

[0098] Currently, the smallest outer diameter of a miniature spear gun can be made to be around 0.22 mm, and the smallest inner diameter can be around 0.12 mm; this invention can ensure the normal operation of such a spray gun. Table 4 below shows the dimensions of miniature spear guns that can be achieved in the industry at present.

[0099] Table 4 Miniature Spear Dimensions

[0100] Unit: inches

[0101]

[0102] This invention has a simple structure, requiring only a modification to the shot peening spear gun. It is low in cost, highly effective, and applicable to various existing nozzles and spear guns. This invention can be applied to hollow blind hole parts in various fields such as aerospace and automotive, especially blind hole parts with relatively small diameters. It can improve the strength and performance of parts, reduce material usage, and increase the service life of parts.

[0103] Example 1

[0104] The method for shot peening automotive stabilizer bars using the aforementioned spray gun includes the following steps:

[0105] Taking a car stabilizer bar as an example, according to technical requirements, steel shot is used for shot peening at a flow rate of 5 kg / min. The stabilizer bar's inner diameter is 30 mm, and the distance between the nozzle and the shot peening point is 200 mm. The shot peening process requires a nozzle stepping speed of 100 mm / min. It can be seen that the cumulative amount of shot on the stabilizer bar is 15 mm / s, and the nozzle retraction speed is 1.6 mm / s. It can be seen that after 10 seconds of shot peening, the nozzle retraction is 16 mm, which is greater than the cumulative amount of shot per second of 15 mm. If manually controlled, an interval of 1 second shot peening followed by cleaning can be adopted. After 10 shots, the nozzle retraction is 32 mm, and an interval of 2 seconds shot peening followed by cleaning can be adopted. That is, shot peening is performed by increasing the shot peening time by 1 second every 10 shots, and so on, until the shot peening is completed.

[0106] If computer control is used, a cleaning cycle can be adopted after each shot peening, with the shot peening time increased by 1.6 / 15=0.1s each time, and the time interval between cleaning cycles can be extended until the shot peening is completed.

[0107] Since the distance between the nozzle and the working surface decreases as the shot peening time increases at the beginning of shot peening, it is impossible to guarantee that the distance between the low nozzle orifice and the shot peening point of the part is 200mm. According to the process requirements, a minimum working distance can be set, such as 150mm in this example. Then, when manually controlling, the shot can be cleaned once every 15 / (200-150) = 0.3s after shot peening. After 10 shot peenings, it can be changed to cleaning once every 1s as described above. This alternation continues until the shot peening ends.

[0108] If controlled by a computer, the shot peening can be performed once every 0.3 seconds for the first to the 10th shot peening. Starting from the 11th shot, the shot peening time is increased by 0.1 seconds each time, and then the shot is cleaned once more. This process is repeated until the shot peening is finished.

[0109] This invention is not limited to the above-described embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of this invention shall be considered equivalent substitutions and shall be included within the scope of protection of this invention.

[0110] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is impossible to exhaustively list all embodiments here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A method for shot peening blind hole type parts with a spray gun, wherein the spray gun comprises: The spear gun comprises a nozzle, a first flow valve, a bypass connecting pipe, and a second flow valve. The spear gun has a hollow cylindrical structure. The lower end of the spear gun is fixedly connected to the nozzle. The upper end of the spear gun is connected to a pellet conveying device. A first flow valve is installed at the upper end of the spear gun. A bypass connecting pipe is installed on the side wall of the spear gun and is connected to a pellet recovery device. A second flow valve is installed on the bypass connecting pipe. Its characteristic is that it includes the following steps: 1) Open the first flow valve, close the second flow valve, and begin normal shot peening operation; 2) When too many shot particles accumulate in the blind hole, affecting the shot peening effect, record the current nozzle position A, close the first flow valve, open the second flow valve, and at the same time control the nozzle of the spear gun to gradually move towards the blind hole end of the part. Through the negative pressure from the bypass connection pipe, the shot particles in the blind hole are sucked out and transferred to the shot recovery device. 3) After the shot particles that would affect the next step of shot peening are sucked out of the blind hole, close the second flow valve; move the nozzle of the spear gun to position A before the shot particles are cleaned, open the first flow valve, and continue the shot peening operation. 4) Alternate between steps 2) and 3) until all shot peening work inside the blind holes is completed; Step 2) involves the following steps: First, define the area to be shot-peened on the blind hole part as a cylinder with an inner diameter of D; second, determine the shot flow rate as Q. 喷 Inner diameter D, pellet density ρ, nozzle moving speed V 移 and shot peening time t 喷 Calculate the pellet buildup height H inside the part's cavity. 堆 and pellet stacking velocity V 堆 The calculation formula is as follows: H 堆 =[Q 喷 / ρ]*[4 / (π*D 2 )]*t 喷 ; V 堆 =H 堆 / t 喷 ; Let the distance from the nozzle to the bottom of the blind hole be H. 底 ; If H 底 ≥H 堆 +L 工 This indicates that the location of the shot accumulation did not affect the working distance L between the nozzle and the surface to be shot-blasted. 工 To carry out shot peening work; If H 底 <H 堆 +L 工 This indicates that the location of the shot accumulation affects the working distance L between the nozzle and the surface to be shot-blasted. 工 Then, pellet cleaning is required; In step 2), when cleaning the pellets, the nozzle needs to be moved from its current position A to H. 堆 Given a location B and a required time t, 降 Then the cleaning process begins. After cleaning, the nozzle needs to return to position A. Let the required time be t. 升 ; Based on pellet recovery rate Q 回 Pellet recovery flow rate V 回 and t 降 t 升 The working time t2 for the second flow valve to open can be obtained as follows: t2=Q 回 / V 回 +t 降 +t 升 Based on the distance H from position A to the bottom of the blind hole 底 The working distance L between the nozzle and the shot-peened surface 工 and pellet stacking velocity V 堆 and nozzle movement speed V 移 Calculate the allowable working time t1 for the next shot peening; t1= (H) 底 -L 工 ) / (V 堆 -V 移 ).

2. The method for strengthening shot peening of blind hole-type parts according to claim 1, characterized in that: In step 2), if shot peening begins from the blind hole position, the shot accumulation velocity V 堆 > Nozzle movement speed V 移 This results in the inability to guarantee the working distance L between the nozzle and the shot-peened surface. 工 At this point, a minimum working distance L between the nozzle and the shot-peening surface can be set according to the shot-peening requirements. 工min L 工 With L 工min There is a certain distance between them, which is H. 堆 The buffer is used to perform the shot peening and cleaning operations described above; If L 工 With L 工min If the distance between them is insufficient for buffering, or if the shot peening and shot cleaning time is too short, or if the switching frequency of the first and second flow valves is too high, resulting in difficulty in achieving process feasibility or poor economic efficiency, then the distance to the blind hole is problematic. L 工 Strengthening within a certain distance requires other processes or shot peening solutions; for example, arranging blind holes of the parts downwards and peening with shot upwards. Waiting for H 底 ≥L 工 At this time, you can press L. 工 The distance has been adjusted to allow for normal shot peening.

3. The method for strengthening shot peening of blind hole-type parts according to claim 1, characterized in that: The first and second flow valves can be switched manually or automatically by a computer. The first and second flow valves are electromagnetic flow valves.

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