A grinding and matching processing method and fuel injector nozzle pair

Abstract

The present invention belongs to the technical field of precision grinding machining, and discloses a matching grinding machining method and an injector nozzle pair. The matching grinding machining method includes transporting a needle valve from a needle valve tray to a first measuring device by a robotic arm, a signal control component receiving the measurement result of the first measuring device, and at the same time the robotic arm transporting the needle valve back from the first measuring device to a designated position on the needle valve tray. Then, the needle valve body is transported from the needle valve body tray to a grinding machining platform by the robotic arm, and the signal control component sends the measurement result of the first measuring device to the grinding machining platform, and the grinding machining platform is used for grinding the needle valve body. Finally, the signal control component determines whether the size of the needle valve body is qualified according to the measurement result of the second measuring device. If it is qualified, the robotic arm transports the needle valve body back to the designated position on the needle valve body tray, realizing automatic matching grinding, greatly improving the matching grinding machining efficiency, eliminating the need to prepare blanks far exceeding the number of finished products, avoiding waste, and achieving closed-loop feedback control of the machining size of the injector nozzle pair.

Description

Technical Field

[0001] The present invention relates to the technical field of precision grinding processing, and particularly relates to a matching grinding processing method and an injector pair. Background Art

[0002] As one of the key components of an engine, the injector works well or not will seriously affect the performance of the internal combustion engine. In the common rail system, the injector pair is composed of a needle valve and a needle valve body. The processing quality thereof will directly affect the performance of the entire common rail system. Among them, the clearance and lift of the injector pair are two important indicators for evaluating the processing quality. The middle hole of the needle valve body and the outer peripheral wall of the needle valve are the pair clearance, and the distance from the large end face of the needle valve body to the shoulder of the needle valve is the pair lift.

[0003] The processing method of the pair clearance is mainly to first finish machining the middle hole of the needle valve body and the outer peripheral wall of the needle valve separately and perform grading, and then perform matching according to the graded dimensions and clearance values, and finally perform pairing one by one. In order to ensure the quantity of the pairs, the number of parts to be prepared for the needle valve and the needle valve body is much more than the number of pairs, resulting in waste, which is not suitable for small-batch trial production, and there is an easy situation of mixing materials during grading and matching. The pair lift is to measure and grade the lift dimension and grind the grinding allowance under the condition of completing the pair matching, so as to realize the control of the lift dimension from the shoulder at the tail of the needle valve to the large end face of the needle valve body. In order to ensure the accuracy of the pair lift, re-measurement is required after processing. If the pair lift is out of tolerance, re-grading and processing are required, and the process is cumbersome and the processing efficiency is low.

[0004] Therefore, there is an urgent need for a matching grinding processing method and an injector pair to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a matching grinding processing method, which does not require preparing blanks far exceeding the number of finished products, avoids waste, and is suitable for small-batch trial production. At the same time, the processing dimensions of the injector pair are closed-loop feedback controlled, and all position conversions are automatically completed by a robotic arm, reducing the skill requirements for operators.

[0006] In order to solve the above problems existing in the prior art, the present invention adopts the following technical solutions:

[0007] A matching grinding processing method for matching grinding and processing an injector pair, the injector pair includes a needle valve body and a needle valve located in the needle valve body, and the matching grinding processing method includes:

[0008] S100: The robotic arm transports the needle valve from the needle valve tray to the first measuring device, the signal control component receives the measurement result of the first measuring device, and at the same time the robotic arm transports the needle valve from the first measuring device back to the designated position of the needle valve tray;

[0009] S200: The robotic arm transports the needle valve body from the needle valve body tray to the grinding platform, and the signal control component sends the measurement result of the first measuring device to the grinding platform, which is used for grinding the needle valve body;

[0010] S300: The signal control component determines whether the size of the needle valve body is qualified according to the measurement result of the second measuring device. If it is qualified, the robotic arm transports the needle valve body back to the designated position on the needle valve body tray. If it is unqualified, the robotic arm places the needle valve body on the non-conforming product tray.

[0011] Preferably, the matching grinding method further includes, before S100:

[0012] S10: Start the grinding platform, the first measuring device and the robotic arm, place several to-be-matched needle valves into the needle valve tray, and place several to-be-processed needle valve bodies into the needle valve body tray.

[0013] Preferably, the matching grinding method further includes, between S10 and S100:

[0014] S20: Before the first processing, the robotic arm places the previous needle valve on the first measuring device onto the non-conforming product tray.

[0015] Preferably, in S200 of the matching grinding method, it specifically includes:

[0016] S201: The robotic arm transports the needle valve body from the needle valve body tray to the grinding platform;

[0017] S202: The robotic arm transports the previous needle valve body on the grinding platform to the second measuring device, and the signal control component receives the measurement result of the second measuring device;

[0018] S203: The signal control component determines whether the previous needle valve body triggers the adjustment threshold. If the measurement result of the second measuring device exceeds the adjustment threshold, the grinding platform adjusts the grinding parameters and processes the needle valve body. If the measurement result of the second measuring device does not exceed the adjustment threshold, the grinding platform grinds the needle valve body according to the original parameters.

[0019] Preferably, the matching grinding method further includes, between S201 and S202:

[0020] S2010: Before the first processing, the robotic arm places the needle valve body on the second measuring device onto the non-conforming product tray.

[0021] Preferably, the signal control component includes a control circuit board, a signal receiving module, and a signal sending module. The control circuit board is communicatively connected to the first measuring device and the second measuring device through the signal receiving module, and the control circuit board is communicatively connected to the robotic arm and the grinding platform through the signal sending module.

[0022] Preferably, the first measuring device, the second measuring device, the grinding platform, the needle valve tray, the needle valve body tray, and the robotic arm are all located inside the box.

[0023] Preferably, the box is provided with a maintenance window.

[0024] Preferably, the robotic arm is provided with a first jaw and a second jaw. The first jaw is used for clamping the needle valve body and the needle valve, and the second jaw is used for clamping the previous needle valve body and the previous needle valve.

[0025] To achieve the above object, the present invention also provides an injector nozzle pair, characterized in that it has an injector nozzle pair formed by the above-mentioned matching grinding method.

[0026] The beneficial effects of the present invention are as follows:

[0027] The matching grinding method provided by the present invention transports the needle valve from the needle valve tray to the first measuring device through the robotic arm. The signal control component receives the measurement result of the first measuring device, and at the same time, the robotic arm transports the needle valve back to the designated position on the needle valve tray from the first measuring device. Then, the needle valve body is transported from the needle valve body tray to the grinding platform through the robotic arm. The signal control component sends the measurement result of the first measuring device to the grinding platform, and the grinding platform is used for grinding the needle valve body. Finally, the signal control component judges whether the size of the needle valve body is qualified according to the measurement result of the second measuring device. If it is qualified, the robotic arm transports the needle valve body back to the designated position on the needle valve body tray. If it is unqualified, the robotic arm places the needle valve body on the defective product tray. It realizes automatic matching grinding of the radial and axial dimensions of the needle valve body with one loading, simplifies the process flow, greatly improves the matching grinding efficiency, and at the same time, realizes precise matching one by one, with stable and controllable quality and high qualification rate. There is no need to prepare blanks far exceeding the number of finished products, avoiding waste and saving costs, which is suitable for small batch trial production. At the same time, the processing size of the injector nozzle pair has closed-loop feedback control, without downtime waiting, and all position conversions are automatically completed by the robotic arm. Each link is smoothly connected and does not require manual intervention, reducing the skill requirements for operators.

[0028] The injector nozzle pair provided by the present invention has an injector nozzle pair formed by the above-mentioned matching grinding method. Through the implementation of the matching grinding method, it realizes automatic matching grinding, simplifies the process flow, and greatly improves the matching grinding efficiency. Description of the Drawings

[0029] Figure 1 is the flow of the grinding and matching processing method in the embodiment of the present invention Figure One ;

[0030] Figure 2 is the flow of the grinding and matching processing method in the embodiment of the present invention Figure Two ;

[0031] Figure 3 is the structural schematic diagram of the fuel injector couple grinding and matching processing system in the embodiment of the present invention.

[0032] Reference numerals:

[0033] 1. Robot arm;

[0034] 2. Needle valve tray;

[0035] 3. First measuring device;

[0036] 4. Signal control component;

[0037] 5. Needle valve body tray;

[0038] 6. Grinding and processing platform;

[0039] 7. Reject tray;

[0040] 8. Second measuring device;

[0041] 9. Box body. Detailed implementation manners

[0042] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that only parts related to the present invention rather than all structures are shown in the drawings for the convenience of description.

[0043] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0044] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0045] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left" and "right" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0046] The processing method of the couple parts clearance is mainly to first finish-machine the middle hole of the nozzle body and the outer peripheral wall of the nozzle needle separately and perform grading, and then perform matching according to the graded dimensions and clearance values, and finally pair them one by one. In order to ensure the quantity of the couple parts, the number of parts of the nozzle needle and the nozzle body to be prepared is much more than the number of couple parts, resulting in waste, not being suitable for small-batch trial production, and there is an easy situation of mixing materials in grading and matching. The couple parts lift is to perform lift dimension measurement grading and grading grinding under the condition of completing the pairing of the couple parts, so as to realize the control of the lift dimension from the shoulder at the tail of the nozzle needle to the large end face of the nozzle body. To ensure the accuracy of the couple parts lift, re-measurement is required after processing. If the couple parts lift is out of tolerance, re-grading processing is needed, and the process is cumbersome and the processing efficiency is low. In view of this, this embodiment provides a grinding and matching processing method, which does not require preparing blanks far exceeding the number of finished products, avoids waste, and is suitable for small-batch trial production. At the same time, the closed-loop feedback control of the processing dimensions of the fuel injector couple parts, and all position conversions are automatically completed by the robotic arm 1, reducing the skill requirements for operators.

[0047] As Figures 1 - 2 shown, in this embodiment, a grinding and matching processing method is used for grinding and matching fuel injector couple parts. The fuel injector couple parts include a nozzle body and a nozzle needle, and the nozzle needle is located in the nozzle body. In order to solve the above problems existing in the grading and matching of fuel injector couple parts and the control of couple parts lift, the grinding and matching processing method provided by the present invention includes the following steps:

[0048] S10: Start the grinding platform 6, the first measuring device 3 and the robotic arm 1. Place a number of needle valves to be matched into the needle valve tray 2, and place a number of needle valve bodies to be processed into the needle valve body tray 5. The number of needle valves is N, and the number of needle valve bodies is also N. The number of needle valves and needle valve bodies is the same.

[0049] S20: Before the first processing, the robotic arm 1 places the previous needle valve on the first measuring device 3 onto the non-conforming product tray 7.

[0050] The pick-up operation is performed regardless of whether there is a needle valve on the first measuring device 3. If there is no needle valve on the first measuring device 3, step S100 is carried out. If there is a needle valve on the first measuring device 3, the robotic arm 1 places the needle valve into the non-conforming product tray.

[0051] S100: The robotic arm 1 transports the needle valve from the needle valve tray 2 to the first measuring device 3. The signal control component 4 receives the measurement result of the first measuring device 3. At the same time, the robotic arm 1 transports the needle valve back from the first measuring device 3 to the designated position on the needle valve tray 2.

[0052] The robotic arm 1 picks the Nth needle valve from the needle valve tray 2 and transports the needle valve to the first measuring device 3. The first measuring device 3 measures the radial and axial dimensions of the Nth needle valve, specifically measuring the outer diameter D1 (radial dimension) of the needle valve and the distance H1 (axial dimension) from the shoulder of the needle valve to the intersection line. The measurement result is fed back to the signal control component 4. According to the coupling clearance ΔD and the lift ΔH, the theoretical diameter D2 of the middle hole of the needle valve body is calculated as D2 = D1 + ΔD, and the theoretical depth H2 from the tail of the needle valve body to the large end face is H2 = H1 + ΔH. At the same time, the robotic arm 1 retrieves the needle valve from the first measuring device 3 and places it in the corresponding serial number position in the needle valve tray 2.

[0053] S200: The robotic arm 1 transports the needle valve body from the needle valve body tray 5 to the grinding platform 6. The signal control component 4 sends the measurement result of the first measuring device 3 to the grinding platform 6, and the grinding platform 6 is used to grind the needle valve body.

[0054] S200 specifically includes S201 to S203.

[0055] S201: The robotic arm 1 transports the needle valve body from the needle valve body tray 5 to the grinding platform 6.

[0056] The robotic arm 1 picks the Nth needle valve body from the needle valve body tray 5 and transports it to the grinding platform 6, and removes the (N - 1)th needle valve body on the grinding platform 6.

[0057] S202: The robotic arm 1 transports the (N - 1)th needle valve body on the grinding platform 6 to the second measuring device 8. The signal control component 4 receives the measurement result of the second measuring device 8.

[0058] Place the (N - 1)-th needle valve body on the second measuring device 8 for radial and axial dimension measurement, and then feed the measurement results back to the signal control component 4.

[0059] S203: The signal control component 4 determines whether the previous needle valve body triggers the adjustment threshold. If the measurement result of the second measuring device 8 exceeds the adjustment threshold, the grinding processing platform 6 adjusts the grinding processing parameters and processes the N-th needle valve body. If the measurement result of the second measuring device 8 does not exceed the adjustment threshold, the grinding processing platform 6 grinds the N-th needle valve body according to the original parameters.

[0060] The signal control component 4 determines whether the grinding processing platform 6 triggers the adjustment threshold according to the measurement results. If the needle valve body exceeds the adjustment threshold, the specific adjustment amount is calculated based on the measured value, and the signal control unit sends the corrected adjustment amount to the grinding processing platform 6, which takes effect during the grinding processing of the N-th needle valve body. If it does not reach the adjustment threshold, there is no need to adjust the grinding processing parameters of the needle valve body, and the grinding processing platform 6 directly starts processing the N-th needle valve body.

[0061] S300: The signal control component 4 determines whether the dimensions of the needle valve body are qualified according to the measurement results of the second measuring device 8. If they are qualified, the robotic arm 1 transports the needle valve body back to the designated position on the needle valve body tray 5. If they are unqualified, the robotic arm 1 places the needle valve body on the non-conforming product tray 7.

[0062] The signal control component 4 determines whether D2 and H2 are qualified. If they are qualified, the (N - 1)-th needle valve body is transported by the robotic arm 1 to the corresponding serial number position on the needle valve body tray 5. If they are unqualified, the needle valve body is transported to the non-conforming product tray 7, and the corresponding serial number position on the needle valve body tray 5 is vacated.

[0063] Repeat steps S100 - S300 until the processing of the last needle valve body is completed.

[0064] The matching grinding method provided in this embodiment transports the needle valve from the needle valve tray 2 to the first measuring device 3 by the robotic arm 1. The signal control component 4 receives the measurement result of the first measuring device 3. At the same time, the robotic arm 1 transports the needle valve back from the first measuring device 3 to the designated position on the needle valve tray 2. Then, the robotic arm 1 transports the needle valve body from the needle valve body tray 5 to the grinding platform 6. The signal control component 4 sends the measurement result of the first measuring device 3 to the grinding platform 6, and the grinding platform 6 is used to grind the needle valve body. Finally, the signal control component 4 determines whether the size of the needle valve body is qualified according to the measurement result of the second measuring device 8. If it is qualified, the robotic arm 1 transports the needle valve body back to the designated position on the needle valve body tray 5. If it is unqualified, the robotic arm 1 places the needle valve body on the defective product tray 7. It realizes automatic matching grinding of the radial and axial dimensions of the needle valve body in one loading, simplifies the process flow, greatly improves the matching grinding processing efficiency. At the same time, it realizes precise one-to-one matching, with stable and controllable quality, high qualification rate, no need to prepare blanks far exceeding the number of finished products, avoiding waste and saving costs, and is suitable for small batch trial production. At the same time, the processing size of the fuel injector couple is closed-loop feedback controlled, without shutdown waiting, and all position conversions are automatically completed by the robotic arm 1. Each link is smoothly connected without manual intervention, reducing the skill requirements of operators and enabling unattended operation.

[0065] Further, continue to refer to Figures 1 - 2 , the signal control component 4 includes a control circuit board, a signal receiving module and a signal sending module. The control circuit board is communicatively connected to the first measuring device 3 and the second measuring device 8 through the signal receiving module, and the control circuit board is communicatively connected to the robotic arm 1 and the grinding platform 6 through the signal sending module. Specifically, the signal sending module is communicatively connected to the robotic arm 1 and the grinding platform 6, and the signal receiving module is communicatively connected to the first measuring device 3 and the second measuring device 8. When the signal receiving module receives the sizes of the needle valve and the needle valve body measured by the first measuring device 3 and the second measuring device, it sends a high level to the control circuit board through the signal receiving module. The control circuit board can control the grinding platform 6 to grind the needle valve and the needle valve body through the signal sending module, or send a low level to the control circuit board through the signal receiving module. The control circuit board can control the grinding platform 6 to stop processing the needle valve and the needle valve body through the signal sending module.

[0066] Further, continue to refer to Figures 1 - 2 , the first measuring device 3, the second measuring device 8, the grinding platform 6, the needle valve tray 2, the needle valve body tray 5 and the robotic arm 1 are all located in the box body 9, which plays a role in dust prevention and protection.

[0067] Further, continue to refer to Figures 1 - 2 , the box body 9 is provided with a maintenance window, which is convenient for debugging and repairing the devices and circuits in the box body 9.

[0068] Further, continue to refer to Figures 1 - 2 , the robotic arm 1 is provided with a first jaw and a second jaw. The first jaw is used to clamp the needle valve body and the needle valve, and the second jaw is used to clamp the previous needle valve body and the previous needle valve. Specifically, the first jaw and the second jaw can be used alternately, and both the first jaw and the second jaw have two clamping positions, which can be used to clamp the needle valve and the needle valve body respectively, being flexible and convenient.

[0069] This embodiment also provides an injector nozzle pair, which is an injector nozzle pair formed by the above-mentioned matching grinding processing method, and relates to the technical field of precision grinding processing. Through the implementation of the matching grinding processing method, the injector nozzle pair is automatically matched and ground, simplifying the process flow and greatly improving the matching grinding processing efficiency. At the same time, all are automatically completed by the robotic arm 1, enabling unattended operation.

[0070] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A grinding and matching processing method for grinding and matching fuel injector pairs. The fuel injector pair includes a nozzle body and a needle valve located within the nozzle body. Characterized in that, The grinding and matching processing method includes: S100: The robotic arm (1) transports the needle valve from the needle valve tray (2) to the first measuring device (3). The signal control component (4) receives the measurement result of the first measuring device (3). At the same time, the robotic arm (1) transports the needle valve back from the first measuring device (3) to the designated position on the needle valve tray (2); S200: The robotic arm (1) transports the nozzle body from the nozzle body tray (5) to the grinding platform (6). The signal control component (4) sends the measurement result of the first measuring device (3) to the grinding platform (6), and the grinding platform (6) is used to grind the nozzle body; S300: The signal control component (4) determines whether the size of the nozzle body is qualified according to the measurement result of the second measuring device (8). If it is qualified, the robotic arm (1) transports the nozzle body back to the designated position on the nozzle body tray (5). If it is unqualified, the robotic arm (1) places the nozzle body on the non-conforming product tray (7); The grinding and matching processing method further includes, before S100: S10: Start the grinding platform (6), the first measuring device (3) and the robotic arm (1). Place a number of needle valves to be matched into the needle valve tray (2), and place a number of nozzle bodies to be processed into the nozzle body tray (5); The grinding and matching processing method further includes, between S10 and S100: S20: Before the first processing, the robotic arm (1) places the previous needle valve on the first measuring device (3) on the non-conforming product tray (7); In the grinding and matching processing method, S200 specifically includes: S201: The robotic arm (1) transports the nozzle body from the nozzle body tray (5) to the grinding platform (6); S202: The robotic arm (1) transports the previous nozzle body on the grinding platform (6) to the second measuring device (8), and the signal control component (4) receives the measurement result of the second measuring device (8); S203: The signal control component (4) determines whether the previous nozzle body triggers the adjustment threshold. If the measurement result of the second measuring device (8) exceeds the adjustment threshold, the grinding platform (6) adjusts the grinding processing parameters and processes the nozzle body. If the measurement result of the second measuring device (8) does not exceed the adjustment threshold, the grinding platform (6) grinds the nozzle body according to the original parameters.

2. The grinding and matching processing method according to claim 1, Characterized in that, The grinding and matching processing method further includes, between S201 and S202: S2010: Before the first processing, the robotic arm (1) places the nozzle body on the second measuring device (8) on the non-conforming product tray (7).

3. The grinding and matching processing method according to claim 1, Characterized in that, The signal control component (4) includes a control circuit board, a signal receiving module, and a signal transmitting module. The control circuit board is communicatively connected to the first measuring device (3) and the second measuring device (8) through the signal receiving module, and the control circuit board is communicatively connected to the robotic arm (1) and the grinding processing platform (6) through the signal transmitting module.

4. The matching grinding method according to claim 1, characterized in that the first measuring device (3), the second measuring device (8), the grinding processing platform (6), the needle valve tray (2), the needle valve body tray (5), and the robotic arm (1) are all located inside the box body (9).

5. The matching grinding method according to claim 4, characterized in that the box body (9) is provided with a maintenance window.

6. The matching grinding method according to claim 1, characterized in that the robotic arm (1) is provided with a first jaw and a second jaw. The first jaw is used for clamping the needle valve body and the needle valve, and the second jaw is used for clamping the previous needle valve body and the previous needle valve.

7. An injector nozzle pair, characterized in that it has an injector nozzle pair formed by the matching grinding method according to any one of claims 1-6.

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