Rolling device for strengthening internal thread root fillet of ultrahigh-strength part

Abstract

The invention discloses a rolling device for strengthening an internal thread root fillet of an ultra-high-strength part, a pressure sensor is arranged in a groove of a base, a roller supporting block is arranged on the pressure sensor and the base, and the roller supporting block, the pressure sensor and the base are fixed together through a connecting screw, a gasket and a nut in a compression joint mode. The roller supporting block can rotate around the connecting screw; the rear end of the roller supporting block and the base are positioned together through a positioning screw; the roller shaft is sleeved with the roller in a clearance manner, and the roller is axially limited by the separation blade and the fixing nut fixed on the roller shaft; the base is connected with a lathe general tool apron; the pressure sensor is connected to the control and display instrument through a data line; the control and display instrument has integrated data recording, logic judgment and storage functions. Round corners of roots of internal threads with different sizes and specifications of ultrahigh-strength parts can be subjected to rolling strengthening, the rolling pressure can be monitored, the strengthening effect can be directly displayed, the structure is stable, and reliability is high.

Description

Technical Field

[0001] The invention belongs to the technical field of surface strengthening of parts, and relates to a rolling device for strengthening the fillet of the root of an internal thread of an ultra-high strength steel part. Background Art

[0002] Normally, in order to improve the strength and fatigue resistance of parts, the surface of the parts can be extruded to produce a certain amount of plastic deformation to optimize the cutting surface and residual stress. However, the root area of ​​the thread is small, the ultra-high strength steel parts have high hardness and are difficult to process. The rolling process is only controlled by referring to the machine tool feed rate. The actual strengthening effect can only be verified through fatigue testing. The fatigue test equipment is complex, the test process is complex, and destructive tests are carried out. Finished parts can only be sampled and fatigue tests cannot be carried out on all of them. The rolling effect cannot be further guaranteed. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art and to provide a rolling device for strengthening the root fillet of the internal thread of ultra-high strength parts. The rolling device can perform rolling strengthening on the root fillet of the internal thread of ultra-high strength parts of different sizes and specifications, and can monitor the rolling pressure and directly display the strengthening effect. The structure is stable and the reliability is high. No subsequent tests are required, which improves the processing quality and production efficiency of the parts and reduces the production cost.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is: a rolling device for strengthening the root fillet of the internal thread of ultra-high strength parts, including a base, a roller support block, a pressure sensor, a control and display instrument, and a roller; the front end of the base is concave with a groove with the same thickness as the length and thickness of the pressure sensor, the pressure sensor is placed in the groove of the base, and the roller support block is placed on the pressure sensor and the base. The roller support block, the pressure sensor and the base are crimped and fixed together by connecting screws, washers and nuts through through-connecting holes opened on the three, and the roller support block can rotate around the connecting screws; the rear end of the roller support block and the base are positioned together by positioning screws and connecting nuts through positioning holes connected to the two, and the roller support block The positioning hole on it is long and strip-shaped; a roller shaft with a threaded end is arranged at the front center of the roller support block, and the roller gap is sleeved on the roller shaft, and the axial limit is performed by a baffle and a fixing nut fixed on the thread at the end of the roller shaft; the base is connected to the universal tool holder of the lathe, and the tool holder feed provides rolling pressure; the pressure sensor is connected to the control and display instrument by a data line; the control and display instrument has integrated data recording, logical judgment and storage functions, and can be manually set to record the rolling pressure value from the beginning of the processing process, and manually trigger the stop after the processing is completed. The data is recorded as the corresponding relationship between time and rolling pressure. The judgment logic can set the proportion of the time when the pressure is higher / lower than a certain threshold to the rolling time, which can be used as a preliminary evaluation of the rolling result.

[0005] Further preferably, the connecting nut is composed of two nuts, and the two nuts are connected and cooperated with the positioning screw to fix and prevent loosening.

[0006] Compared with the prior art, the beneficial effects of the present invention are as follows: the specifications of the roller of the present invention can be replaced as needed, the roller support can rotate around the connecting screw, and the angle can be locked by the positioning screw to adapt to threads of different sizes and pitches, thereby ensuring that the roller is in full contact with the root fillet of the processed thread without affecting other thread surfaces; the base can be connected to the universal tool holder of an ordinary lathe to perform rolling and strengthening on the root fillets of internal threads of different sizes and specifications of ultra-high-strength steel parts, and the rolling operation is simple, the structure is stable, and the reliability is high. The roller squeezes the root of the internal thread, and the pressure is transmitted to the pressure sensor through the roller support block. The pressure sensor transmits the signal to the control and display instrument. After the data processing of the control and display instrument, the rolling effect is directly displayed, and the operation is simple, intuitive, and convenient. There is no need to conduct subsequent rolling effect tests, which improves the processing quality and production efficiency of parts and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a front cross-sectional view of the present invention; Figure 3 It is a rear view of the present invention; Figure 4 for Figure 3 AA section view. DETAILED DESCRIPTION

[0008] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0009] like Figures 1 to 4As shown, this embodiment includes a base 7, a roller support block 4, a pressure sensor 9, a control and display instrument 8, and a roller 3. The front end of the base 7 is concave with a groove having the same length and thickness as the pressure sensor 9. The pressure sensor 9 is placed in the groove of the base 7. The roller support block 4 is placed on the pressure sensor 9 and the base 7. The roller support block 4, the pressure sensor 9, and the base 7 are crimped and fixed together by connecting screws 5, washers 10, and nuts 12 through the through connecting holes opened on the three. The roller support block 4 can rotate around the connecting screws 5. The rear end of the roller support block 4 and the base 7 are positioned together by the positioning screws 6 and the connecting nuts 12 through the positioning holes connected to the two. The positioning holes on the roller support block 4 are long holes. The roller support 4 can rotate around the connecting screws 5 and the angle is locked by the positioning screws 6 to adapt to threads of different sizes and pitches, thereby ensuring that the roller 3 is fully in contact with the fillet of the root of the processed thread without affecting other thread surfaces. A roller shaft with a threaded end is arranged at the front center of the roller support block 4, and the roller 3 is loosely sleeved on the roller shaft, and is axially limited by a baffle 2 and a fixing nut 1 fixed on the threaded end of the roller shaft. The base 7 is connected to the universal tool holder of the lathe, and an ordinary lathe can be used. The pressure sensor 9 is connected to the control and display instrument 8 by a data line; the control and display instrument 8 has integrated data recording, logical judgment and storage functions, and can be manually set to record the rolling pressure value from the beginning of the processing process, and manually trigger the stop after the processing is completed. The data is recorded as the corresponding relationship between time and rolling pressure. The judgment logic can set the proportion of the time when the pressure is higher / lower than a certain threshold to the rolling time, which can be used as a preliminary evaluation of the rolling result.

[0010] In this embodiment, the connecting nut 12 is composed of two nuts, and the two nuts 12 are connected and matched with the positioning screw 6 to fix and prevent loosening.

[0011] In this embodiment, the roller 3 and the roller shaft are made of alloy tool steel, and the remaining structural parts are made of precipitation hardened stainless steel.

[0012] Of course, the present invention has many other embodiments. Without violating the spirit and essence of the present invention, technicians familiar with the field can make corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should be regarded as improvements of equivalent technologies and belong to the protection scope of the claims of the present invention.

Claims

1. A rolling device for strengthening the root fillet of the internal thread of ultra-high strength parts, characterized in that: It includes a base, a roller support block, a pressure sensor, a control and display instrument, and a roller; a groove with the same thickness as the length and thickness of the pressure sensor is concave in the front end of the base, the pressure sensor is placed in the groove of the base, and the roller support block is placed on the pressure sensor and the base, the roller support block, the pressure sensor and the base are crimped and fixed together by connecting screws, washers and nuts through through-connecting holes opened on the three, and the roller support block can rotate around the connecting screws; the rear end of the roller support block and the base are positioned together by positioning screws and connecting nuts through positioning holes connected to the two, and the positioning holes on the roller support block are long strips; a roller shaft with a threaded end is arranged at the center of the front end of the roller support block, the roller gap is sleeved on the roller shaft, and axial limitation is performed by a baffle and a fixing nut fixed on the thread at the end of the roller shaft; the base is connected to the universal tool holder of the lathe; the pressure sensor is connected to the control and display instrument by a data cable; the control and display instrument has integrated data recording, logical judgment and storage functions.

2. The rolling device for strengthening the root fillet of the internal thread of ultra-high strength parts according to claim 1 is characterized in that: The connecting nut is composed of two nuts, and the two nuts are connected and matched with the positioning screw to fix and prevent loosening.

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