Three-expansion comfortable local array type honing head and using method

Abstract

The invention discloses a three-expansion partial array type honing head and a using method, and belongs to the technical field of honing head machining, the honing head comprises a honing head main body and a plurality of sanding strips arranged on the honing head main body, an air inlet hole is formed in the top end of the honing head main body, an air measuring hole is formed in the side wall of the honing head main body, and a plurality of sanding strip grooves are formed in the honing head main body; a sanding strip is arranged in the sanding strip groove, the sanding strip is connected with the honing head main body through a sanding strip push rod and a sanding strip expansion device, the sanding strip can reciprocate in the corresponding sanding strip groove, and the first sanding strip expansion device, the second sanding strip expansion device and the third sanding strip expansion device are respectively enabled to reach an expansion state by pressing the first sanding strip push rod, the second sanding strip push rod and the third sanding strip push rod; by optimizing the internal structure of the honing head, the shape of the abrasive strip, the expansion and relaxation principle and the like, the machining efficiency is improved, and the precision requirement of the engine cylinder hole is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of honing head processing, in particular to a three-expansion and relaxation array honing head and a use method thereof. Background Art

[0002] Honing is an efficient processing method that can achieve high precision, high surface quality and long life on the workpiece surface. It can effectively improve dimensional accuracy, shape accuracy and reduce Ra value. It is gradually widely used in automobile production and is mostly used for processing holes and cavities. At present, since the honing head is ground by the internal spring and centrifugal force each time, it cannot perform adaptive dynamic adjustment, so that the coaxiality cannot be guaranteed and dynamic compensation cannot be achieved during the intermediate processing. This also leads to uneven wear of the oilstone on the honing head, resulting in a decrease in accuracy. The existing method is to regularly replace the honing head oilstone, which wastes production time and material costs. However, more and more special-shaped cavities require uniform honing technology to improve dimensional accuracy, and such defects are becoming more and more obvious. Therefore, being able to achieve dynamic compensation during the honing process is a key link that urgently needs to be broken through in the current processing process. Summary of the invention

[0003] In view of the above problems, the present invention provides a three-expansion and relaxation array honing head and a method of using the same, comprising a honing head body and a plurality of sand bars arranged on the honing head body, an air inlet hole is arranged at the top of the honing head body, an air measuring hole is arranged on the side wall of the honing head body, a plurality of sand bar grooves are arranged on the honing head body, sand bars are arranged in the sand bar grooves, the sand bars are connected to the honing head body through sand bar push rods and sand bar expansion and relaxation, the sand bars can reciprocate in the corresponding sand bar grooves, and the sand bars include a first sand bar, a second sand bar and a third sand bar. Sand bars, sand bar push rods include a first sand bar push rod, a second sand bar push rod and a third sand bar push rod, and sand bar expansion and relaxation include a first sand bar expansion and relaxation, a second sand bar expansion and relaxation and a third sand bar expansion and relaxation. The first sand bar expansion and relaxation, the second sand bar expansion and relaxation, and the third sand bar expansion and relaxation are respectively achieved by pressing the first sand bar push rod, the second sand bar push rod and the third sand bar push rod; by optimizing the internal structure of the honing head, the sand bar shape, the expansion and relaxation principle, etc., the processing efficiency is improved and the accuracy requirements of the engine cylinder bore are guaranteed.

[0004] The technical solution of the present invention is as follows: a three-expansion and relaxation array honing head, comprising: a honing head main body and a plurality of sand bars arranged on the honing head main body, an air inlet hole is provided at the top of the honing head main body, an air measurement hole is provided on the side wall of the honing head main body, a plurality of sand bar grooves are provided on the honing head main body, sand bars are provided in the sand bar grooves, the sand bars are connected to the honing head main body through sand bar push rods and sand bar expansion, the sand bars can reciprocate in the corresponding sand bar grooves, the sand bars include a first sand bar, a second sand bar and a third sand bar, the sand bar push rods include a first sand bar push rod, a second sand bar push rod and a third sand bar push rod, the sand bar expansion includes a first sand bar expansion, a second sand bar expansion and a third sand bar expansion, and the first sand bar expansion, the second sand bar expansion and the third sand bar expansion are respectively made to reach an expansion state by pressing the first sand bar push rod, the second sand bar push rod and the third sand bar push rod.

[0005] Furthermore, the outer shell of the first sand bar push rod is connected to the second sand bar push rod, the outer shell of the second sand bar push rod is connected to the third sand bar push rod, the third sand bar push rod is provided with a threaded hole, and the three sand bar push rods are fixed as a whole by a top screw bolt.

[0006] Furthermore, a spring groove is arranged outside the honing head body, and the spring groove is annular and is used for buffering the sanding strip.

[0007] Furthermore, a suspension rod is provided at the end of the air inlet hole of the main body, and there are two suspension rods located on the same straight line.

[0008] Furthermore, each sand strip is spaced 60 degrees apart.

[0009] A method for using a three-expansion and relaxation array honing head comprises the following steps:

[0010] S1 assembles and adjusts the honing head and the top screw bolt to ensure that the three expansion and relaxation states are opened at the same time;

[0011] S2 gas source detection, the gas impacts the inner wall of the workpiece through the flow channel, and the analog data is fed back to the control system. According to the status displayed on the equipment panel, observe the gas volume of the gas outlet and whether the gas is stable.

[0012] If it is unstable, clear the air test hole and repeat step S2;

[0013] If stable, proceed to step S3;

[0014] S3 compares the distance obtained by gas measurement with the allowance before processing.

[0015] If the machining allowance does not meet the tolerance range, replace

[0016] If the machining allowance meets the tolerance range, and:

[0017] If the detection cylinder hole margin is greater than the measured cylinder hole margin, it is necessary to add and repeat step S3;

[0018] If the detected cylinder hole margin is less than or equal to the measured cylinder hole margin, then proceed to step S4;

[0019] S4 adjusts the honing head through the adjusted assembly for processing. The system automatically times and records data changes. During the processing, the honing head is used to measure the state of the engine cylinder bore until the processing is completed.

[0020] Furthermore, in step S4, if it is found during inspection that a certain position of the cylinder bore is not processed in place, data is fed back to the system, and then a command is issued through the CNC to perform single-segment multiple separate processing to repair and optimize the cylinder bore straightness until it is qualified.

[0021] Furthermore, in step S4, it is determined whether the state of the honing head needs to be adjusted, the processing is suspended, and the state of the engine cylinder bore is detected to see whether trumpet holes and big bellies appear. If the above situation does not occur, no adjustment is required and the current processing parameters continue to be executed.

[0022] Furthermore, in step S4, if the cylinder bore state does not meet the process requirements, such as a trumpet hole, a larger upper end and a smaller lower end, or a larger lower end and a smaller upper end, or a big belly, the state of the honing head is adjusted from three simultaneous expansions to a single expansion to repair the cylinder bore.

[0023] The beneficial effects of the present invention are:

[0024] The present invention realizes adaptive adjustment of the oilstone during the honing process based on the detection of air pressure. It enables the honing process to be performed on the special-shaped cavity that is difficult to process and difficult to set up the honing process. At the same time, it can control the uniformity of the oilstone wear on the honing head, reduce the number of oilstone replacements, greatly reduce the processing preparation time, increase the service life of the oilstone, and reduce production costs. Since this patent can realize single-point single control, it can significantly improve the honing accuracy and quality, especially in the control of the roundness and straightness accuracy of deep hole processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the expansion and relaxation working principle of the second sand strip of the present invention.

[0026] Figure 2 It is a schematic diagram of the working principle of the third sand strip expansion and relaxation of the present invention.

[0027] Figure 3 It is a schematic diagram showing the working principle of the first sand strip expansion and relaxation of the present invention.

[0028] Figure 4 Schematic diagram I of the honing head of the present invention. Figure 5 This is a schematic diagram II of the honing head of the present invention. Figure 6 It is a schematic diagram of the sand bar push rod and the sand bar expansion and contraction of the present invention. Figure 7Schematic diagram of gas impacting the inner wall of the workpiece through the flow channel. Figure 8 Schematic diagram of the implementation method and principle.

[0029] In the figure:

[0030] 1 honing head body, 2 hanging rod, 3 spring groove, 4 sand bar groove, 5 air inlet hole, 6 first sand bar a11, 7 second sand bar a13, 8 third sand bar a12, 9 air measuring hole, 10 second sand bar push rod, 11 first sand bar push rod, 12 third sand bar push rod, 13 second sand bar expansion, 14 third sand bar expansion, 15 first sand bar expansion, 16 threaded hole. DETAILED DESCRIPTION

[0031] It should be noted that in the description of the present invention, the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise", "counterclockwise", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect" and the like should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral connection; the connection can be a mechanical connection or an electrical connection; the connection can be a direct connection or an indirect connection through an intermediate medium, and can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The honing head body 1 in the present invention is the main part of the present invention. Two hanging rods 2 are provided on the upper end of the main body for connecting with the main shaft. An air inlet hole 5 is provided at the top of the main body. Its working principle is that the main shaft air pipe takes in air through the air inlet hole 5 and sprays it from the air measuring hole 9. The amount of air sprayed hits the side wall of the cylinder hole, and is fed back to the system module based on data calculation to identify the excess to be processed. Six sand bar grooves 4 are provided on the main body for installing the three types of sand bars, namely the first sand bar 6, the second sand bar 7, and the third sand bar 8, and the spring groove 3 is used to fix the installed sand bar to prevent movement.

[0034] The core part of the present invention is the internal structure of the honing head. The present invention realizes three expansion and relaxation functions, and each expansion and relaxation plays a decisive role in actual processing. The second sand bar push rod 10, the first sand bar push rod 11, and the third sand bar push rod 12 of the present invention are threadedly connected with the second sand bar expansion and relaxation 13, the third sand bar expansion and relaxation 14, and the first sand bar expansion and relaxation 15 respectively. The second sand bar push rod 10, the first sand bar push rod 11, and the third sand bar push rod 12 can be pressed to make the second sand bar expansion and relaxation 13, the third sand bar expansion and relaxation 14, and the first sand bar expansion and relaxation 15 reach the expansion and relaxation state and meet the use requirements. The function of the threaded hole 16 is to match the top screw bolt with the threaded hole 16, so as to fix the second sand bar push rod 10, the first sand bar push rod 11, and the third sand bar push rod 12 as a whole, so that the three expansion and relaxation states are opened at the same time.

[0035] Implementation methods and principles (such as Figure 8 ):

[0036] The first step is to assemble and adjust the honing head normally, adjust the adjusting screw, and ensure that the three expansion and relaxation states are opened at the same time. Since the sand bar shape in the present invention belongs to the staggered tooth state, it is different from the traditional honing head sand bar. The opening of the three expansion and relaxation states is to ensure the consistency of the cylinder hole accuracy during processing and start the honing process.

[0037] The second step is to detect the gas source. The gas flows through the flow channel and impacts the inner wall of the workpiece (such as Figure 7 ), get analog data and feed it back to the control system. According to the status displayed on the device panel, you can observe the air volume of the air measuring hole and whether the air is stable. If the data shows high and low, and accurate data cannot be obtained, please deal with the status of the air measuring hole in time, for example: impurities around the air measuring hole affect the measurement, the top air inlet hole is not sealed tightly, resulting in leakage, etc.

[0038] The third step is to check the allowance before processing by comparing it with the known distance measured by pneumatic measurement. There are three situations in total: 1. The detected cylinder hole allowance is smaller than the measured cylinder hole allowance, 2. The detected cylinder hole allowance is larger than the measured cylinder hole allowance, 3. The detected cylinder hole allowance is equal to the measured cylinder hole allowance. We can perform pre-processing, do a small amount of processing first, detect the cylinder hole allowance, and then perform fine processing.

[0039] The fourth step is to observe the data changes on the equipment operation panel after the first adjustment to see whether the size requirements are met. If no instructions are given, continue processing to ensure that the processing is qualified in one go.

[0040] The fifth step starts the system automatic timing, and the timing time is determined according to the rotation speed and material hardness. When the rotation speed is constant, the processing time will be longer if the excess after processing is large and the material hardness is high. At the same time, the processing program can be optimized according to the feedback processing time, such as increasing the rotation speed, or processing in sequence or in batches.

[0041] The sixth step is to carry out cyclic measurement during the processing until the processing is completed. The honing head realizes simultaneous processing and inspection during the processing. At the same time, if it is found during the inspection that a certain position of the cylinder hole is not processed in place, the data is fed back to the system, and then a command is issued through the CNC to perform single-segment multiple separate processing to repair and optimize the cylinder hole straightness until it is qualified.

[0042] Step 7: Determine whether the honing head status needs to be adjusted. First, the processing should be suspended and the status of the engine cylinder bore should be checked in time to see if there are any trumpet holes or big bellies. If the above situation does not occur, no adjustment is required and the current processing parameters can be continued.

[0043] Step 8. If the cylinder bore condition does not meet the process requirements, such as a trumpet hole, a larger upper end and smaller lower end, a larger lower end and smaller upper end, or a big belly, etc., adjust the honing head condition in time, switch from three simultaneous expansions to single expansion, and repair the cylinder bore.

[0044] If the cylinder bore has the phenomenon of "larger at the lower end and smaller at the upper end": turn on the single expansion mode, remove the screw in the threaded hole 16, select the third sand strip expansion 14 by issuing a CNC command, and use the single expansion needle to hone the upper end of the cylinder bore and repair it to size.

[0045] If the cylinder bore has the phenomenon of "large upper end and small lower end": turn on the single expansion mode, remove the screw in the threaded hole 16, select the second sand strip expansion 13 by issuing a CNC command, and use the single expansion needle to hone the lower end of the cylinder bore and repair it to size.

[0046] If the cylinder bore has the phenomenon of "large in the middle and small at both ends": turn on the double expansion and relaxation mode, connect the second sand bar push rod 10 and the third sand bar push rod 12 together by bolts, and realize simultaneous opening of the two expansion and relaxation modes, and issue CNC instructions to select the second sand bar push rod 10 and the third sand bar push rod 12 to expand and relax at the same time, and grind the upper and lower ends of the cylinder bore to size.

[0047] If the cylinder bore has the phenomenon of "small in the middle and large at both ends": turn on the single expansion mode, remove the screw in the threaded hole 16, select the first sanding strip push rod expansion 11 by issuing a CNC command, and use the single expansion needle to hone the lower end of the cylinder bore and repair it to size.

[0048] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any modification, equivalent replacement and improvement made by any person skilled in the art within the technical scope disclosed by the present invention and within the spirit and principle of the present invention shall be covered within the protection scope of the present invention. At the same time, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

Claims

1. A three-expansion and relaxation array honing head, characterized in that: include: A honing head body and a plurality of sand bars arranged on the honing head body, an air inlet hole is arranged on the top of the honing head body, an air measurement hole is arranged on the side wall of the honing head body, a plurality of sand bar grooves are arranged on the honing head body, sand bars are arranged in the sand bar grooves, the sand bars are connected to the honing head body through sand bar push rods and sand bar expansion, the sand bars can reciprocate in the corresponding sand bar grooves, the sand bars include a first sand bar, a second sand bar and a third sand bar, the sand bar push rods include a first sand bar push rod, a second sand bar push rod and a third sand bar push rod, the sand bar expansion includes a first sand bar expansion, a second sand bar expansion and a third sand bar expansion, and the first sand bar expansion, the second sand bar expansion and the third sand bar expansion are respectively made to reach an expanded state by pressing the first sand bar push rod, the second sand bar push rod and the third sand bar push rod.

2. The three-expansion and relaxation array honing head according to claim 1, characterized in that: The outer shell of the first sand bar push rod is connected to the second sand bar push rod, the outer shell of the second sand bar push rod is connected to the third sand bar push rod, the third sand bar push rod is provided with a threaded hole, and the three sand bar push rods are fixed as a whole by a top screw bolt.

3. The three-expansion and relaxation array honing head according to claim 1, characterized in that: It also includes a spring groove, which is arranged outside the honing head body and is annular.

4. The three-expansion and relaxation array honing head according to claim 1, characterized in that: A suspension rod is arranged at the air inlet end of the main body, and there are two suspension rods which are located on the same straight line.

5. The three-expansion and relaxation array honing head according to claim 1, characterized in that: Each sand strip is spaced 60 degrees apart.

6. A method for using a three-expansion and relaxation array honing head, characterized in that: The following steps are involved: S1 assembles and adjusts the honing head and the top screw bolt to ensure that the three expansion and relaxation states are opened at the same time; S2 gas source detection, the gas impacts the inner wall of the workpiece through the flow channel, and the analog data is fed back to the control system. According to the status displayed on the equipment panel, observe the gas volume of the gas outlet hole and whether the gas is stable. If it is unstable, clear the gas hole and repeat step S2; If stable, proceed to step S3; S3 compares the distance obtained by gas measurement with the allowance before processing. If the machining allowance does not meet the tolerance range, replace If the machining allowance meets the tolerance range, and: If the detection cylinder hole margin is greater than the measured cylinder hole margin, it is necessary to add and repeat step S3; If the detected cylinder hole margin is less than or equal to the measured cylinder hole margin, then proceed to step S4; S4 uses the adjusted assembly to adjust the honing head for processing. The system automatically times and records data changes. During the processing, the honing head is used to measure the status of the engine cylinder bore until the processing is completed.

7. The method for using the three-expansion and relaxation array honing head according to claim 6, characterized in that: In step S4, if it is found during the inspection that a certain position of the cylinder hole is not processed in place, the data is fed back to the system, and then a command is issued through the CNC to perform single-section multiple separate processing to repair and optimize the cylinder hole straightness until it is qualified.

8. The method for using the three-expansion and relaxation array honing head according to claim 6, characterized in that: In step S4, it is determined whether the honing head state needs to be adjusted, the processing is suspended, and the state of the engine cylinder hole is detected to see whether there are trumpet holes and big belly conditions. If the above conditions do not occur, no adjustment is required and the current processing parameters are continued.

9. The method for using the three-expansion and relaxation array honing head according to claim 6, characterized in that: In step S4, if the cylinder bore state does not meet the process requirements, such as a trumpet hole, a larger upper end and a smaller lower end, or a larger lower end and a smaller upper end, or a big belly, the honing head state is adjusted from three simultaneous expansions to a single expansion to repair the cylinder bore.

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