Roundness correction device for thin-wall part

Abstract

The utility model discloses a thin-wall part roundness correction device, which relates to the technical field of part roundness correction, and comprises a fixed seat, a roundness correction disc, a columnar bulge, a roundness correction safety rod, a movable roundness correction block and a fixed roundness correction block, an elastic piece used for driving the disc correcting disc to reset is arranged between the disc correcting disc and the fixing base. The number of the columnar protrusions is multiple, the columnar protrusions are evenly and fixedly connected to the disc face of the circle correcting disc in the circumferential direction of the circle correcting disc, the columnar protrusions are symmetrically distributed along the perpendicular bisector of the circle correcting disc, and the columnar protrusions are matched to be used for positioning a part to be subjected to circle correcting; the roundness correction safety rod is vertically arranged on the inner side of the part to be roundness corrected; the fixed roundness correction block is in rigid connection with the fixing base, and the movable roundness correction block is driven by the driving mechanism to descend to be matched with the fixed roundness correction block to conduct pressure roundness correction on the part to be roundness corrected. The roundness correction device for the thin-wall part is simple in structure and easy and convenient to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of part rounding, in particular to a thin-wall part rounding device. Background Art

[0002] The gear ring is widely used in the machinery industry due to its multi-directional functions and effects. Due to the particularity of assembly and transmission, the gear ring is destined to be a part with a very special structure. Whether it is an internal gear ring, an external gear ring or a composite part with both internal and external teeth, the common structural characteristics are large inner diameter cavity, extremely thin wall thickness and large tooth width. According to the use environment and the requirements for transmission accuracy, the final tooth shape forming process of the gear ring includes gear shaping, gear turning and gear grinding for internal teeth, and gear hobbing and gear grinding for external teeth. The traditional process of inserting internal teeth is limited in efficiency and accuracy, and it can only insert internal straight teeth. Therefore, it is not suitable for the production of large quantities, high precision and internal helical teeth. Therefore, the processing technology of the internal teeth of the gear ring is mostly carried out by turning and grinding according to the requirements of part accuracy. For non-grinding gear rings, the material is mostly 42CrMo, and the heat treatment process is nitriding. For gear rings that need to be ground, the material is gear steel 20CrMnTiH, and the heat treatment process is carburizing and press quenching.

[0003] Due to the special product structure, the gear ring will always have more or less warping and deformation during carburizing heat treatment. The main manifestation is the elliptical deformation of the outer circle. Even if the press quenching treatment is performed, sometimes there will be workpieces with large deformation, which makes the subsequent processing benchmark unstable, resulting in excessive tooth shape accuracy or insufficient tooth shape finishing allowance after processing, making it difficult to improve the final product qualification rate; for nitriding parts, the tooth shape does not need to be finished after heat treatment, but occasionally the tooth shape accuracy is seriously out of tolerance due to large deformation of the workpiece, which cannot meet the needs of users. Combined with the constraints of the above uncontrollable factors of heat treatment deformation, the quality cost of the gear ring production process has remained high. Although there is a good market, it has been difficult to ensure quality and sufficient supply, resulting in a large gap in end-user demand.

[0004] Therefore, it is necessary to propose a thin-walled parts rounding device to solve the above problems. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] The utility model aims to solve the problem that in the actual production process, the gear ring cannot be processed or used directly due to large deformation after heat treatment, resulting in waste caused by scrapped workpieces. A thin-walled parts rounding device is proposed.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the utility model is implemented through the following technical solutions: a thin-walled parts rounding device, comprising:

[0009] Fixed seat;

[0010] A calibration disc, wherein the calibration disc is arranged above the fixing seat in a sliding manner in a vertical direction, and an elastic member for driving the calibration disc to reset is provided between the calibration disc and the fixing seat;

[0011] A cylindrical protrusion, wherein there are a plurality of the cylindrical protrusions, and the plurality of the cylindrical protrusions are evenly fixedly connected to the disc surface of the calibration disc along the circumference of the calibration disc, and the plurality of the cylindrical protrusions are symmetrically distributed along the perpendicular midline of the calibration disc, and the plurality of the cylindrical protrusions cooperate to position the part to be calibrated;

[0012] A roundness calibration safety rod, which is arranged vertically on the inner side of the part to be rounded;

[0013] The movable calibration block and the fixed calibration block are rigidly connected to the fixed seat. The movable calibration block is driven down by the driving mechanism to cooperate with the fixed calibration block to apply pressure to the part to be calibrated.

[0014] Preferably, a rectangular protrusion is provided on one radial side of the calibration disc, a first cavity matched with the rectangular protrusion is opened on the upper surface of the fixing seat, and the elastic member is located inside the first cavity.

[0015] Preferably, a gap is provided between the shoulder planes on both sides of the rectangular protrusion and the upper plane of the fixing seat, and the width of the gap is 5 to 6 mm.

[0016] Preferably, a second cavity adapted to the calibration circular block is formed on the upper surface of the fixing seat.

[0017] Preferably, the elastic member is a polyurethane elastic block.

[0018] Preferably, the side of the movable rounding block, the cylindrical protrusion and the fixed rounding block acting on the part to be rounded are all provided with an inner curved surface adapted to the outer diameter of the part to be rounded.

[0019] Preferably, the diameter of the roundness calibration safety rod is adapted to the thickness of the part to be calibrated, both ends of the roundness calibration safety rod are provided with arc-shaped surfaces adapted to the inner diameter of the part to be calibrated, and the length of the roundness calibration safety rod is slightly smaller than the inner diameter of the part to be calibrated by 1 to 2 mm.

[0020] Preferably, there are four columnar protrusions, and the dynamic calibration blocks and the fixed calibration blocks are symmetrically distributed on the upper and lower sides of the part to be calibrated, and the dynamic calibration blocks and the fixed calibration blocks are staggered with respect to the columnar protrusions.

[0021] Preferably, a transition connecting piece is further included, and the dynamic calibration circle block is fixedly connected to the transition connecting piece by a hexagon socket screw.

[0022] (III) Beneficial effects

[0023] Compared with the prior art, the utility model provides a thin-walled parts rounding device, which has the following beneficial effects:

[0024] 1. The thin-walled parts rounding device can round the gear ring so that it can be processed later or used directly, avoiding the waste caused by scrapping of workpieces.

[0025] 2. The thin-walled parts rounding device positions the part to be rounded on the rounding disc through the cylindrical protrusion, and then uses the movable rounding block and the fixed rounding block to cooperate to apply pressure to deform the part to be rounded, so as to round it. It has a simple structure and is easy to operate.

[0026] 3. In order to avoid the springback of the part to be calibrated, the thin-walled part calibration device sets a calibration safety rod to determine the pressure deformation amount to offset the springback of the part to be calibrated during the calibration process, ensuring a successful single calibration and avoiding secondary calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a front view schematic diagram of the structure of the utility model;

[0028] Figure 2 It is a cross-sectional schematic diagram of the structure of the utility model;

[0029] Figure 3 This is a schematic diagram of the main view of the calibration disc of the utility model;

[0030] Figure 4 It is a top view schematic diagram of the fixing seat of the utility model.

[0031] In the figure: 1. transition connector; 2. dynamic rounding block; 3. rounding safety rod; 4. rounding plate; 5. part to be rounded; 6. columnar protrusion; 7. fixing seat; 8. fixed rounding block; 9. elastic member; 10. first cavity; 11. second cavity; 12. rectangular protrusion. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0033] See also Figure 1-4As shown, a thin-walled part rounding device comprises a movable rounding block 2, a rounding safety rod 3, a rounding disc 4, a cylindrical protrusion 6 and a fixed rounding block 8. The rounding disc 4 is arranged to slide above the fixed seat 7 along the vertical direction. An elastic member 9 for driving the rounding disc 4 to reset is provided between the rounding disc 4 and the fixed seat 7. There are multiple cylindrical protrusions 6. The multiple cylindrical protrusions 6 are evenly fixedly connected to the disc surface of the rounding disc 4 along the circumference of the rounding disc 4, and the multiple cylindrical protrusions 6 are symmetrically distributed along the mid-vertical line of the rounding disc 4. The multiple cylindrical protrusions 6 are used to position the part 5 to be rounded; the rounding safety rod 3 is vertically arranged on the inner side of the part 5 to be rounded; the fixed rounding block 8 is rigidly connected to the fixed seat 7, and the movable rounding block 2 is driven down by the driving mechanism to cooperate with the fixed rounding block 8 to apply pressure to the part 5 to be rounded.

[0034] During calibration, the long axis of the elliptical deformation of the part 5 to be calibrated is placed on one side of the calibration disk 4 along the plumb direction, and is positioned by a plurality of columnar protrusions 6, and the calibration safety rod 3 is vertically placed in the cavity of the part 5 to be calibrated; the dynamic calibration block 2 is driven downward by the driving mechanism, and the part 5 to be calibrated is driven by the force to move the calibration disk 4 downward as a whole, and the part 5 to be calibrated is squeezed and deformed by the dynamic calibration block 2 and the fixed calibration block 8 until the inner wall of the part 5 to be calibrated contacts the curved surfaces at both ends of the calibration safety rod 3; the driving mechanism drives the dynamic calibration block 2 to move upward and reset, and the elastic member 9 releases the pressure to drive the calibration disk 4 to reset, and the calibrated part is lifted up, thereby completing the calibration of the part 5 to be calibrated. The structure is simple and easy to use.

[0035] In order to facilitate the fixing of the fixing seat 7, ear seats are provided on both sides of the fixing seat 7, and U-shaped grooves are provided on the ear seats. When fixing, the hexagonal cylindrical head screws are passed through the U-shaped grooves and fastened to the hydraulic machine tool workbench.

[0036] In some embodiments, the calibration disc 4 is slidably connected to the fixing seat 7 in the following manner: a rectangular protrusion 12 is provided on one radial side of the calibration disc 4, a first cavity 10 adapted to the rectangular protrusion 12 is provided on the fixing seat 7, the rectangular protrusion 12 is inserted into the first cavity 10 and slidably connected to the fixing seat 7, and the elastic member 9 is located inside the first cavity 10. Specifically, the elastic member 9 is a polyurethane elastic block.

[0037] Specifically, there is a gap between the shoulder planes on both sides of the rectangular protrusion 12 and the upper plane of the fixing seat 7, and the gap width is 5 to 6 mm. By setting the reserved gap, the calibration disc 4 can move downward when subjected to force, so that the fixed calibration block 8 and the movable calibration block 2 can cooperate to squeeze the part 5 to be calibrated and calibrate it.

[0038] In some embodiments, the calibration block 8 is rigidly connected to the fixing seat 7 in the following manner: the upper surface of the fixing seat 7 is provided with a second cavity 11 adapted to the calibration block 8. One end of the calibration block 8 is limited by the second cavity 11.

[0039] In order to avoid damaging the part 5 to be calibrated, the movable calibrating block 2, the cylindrical protrusion 6 and the fixed calibrating block 8 are provided with inner curved surfaces that are adapted to the part 5 to be calibrated on one side of the part 5 to be calibrated. By providing the inner curved surface, the contact surface is increased, the pressure is distributed, and the part 5 to be calibrated is prevented from being damaged.

[0040] Specifically, the inner curved surfaces of the plurality of columnar protrusions 6 are concentric, and the diameter of the inner curved surface of the columnar protrusion 6 is slightly larger than the outer diameter of the part to be calibrated by 0.5 to 0.8 mm, so as to facilitate the placement and removal of the part 5 to be calibrated.

[0041] Specifically, the inner curved surface diameters of the dynamic calibration block 2 and the fixed calibration block 8 are slightly larger than the outer diameter of the part to be calibrated by 2 to 4 mm, so that during the calibration process, the dynamic calibration block 2 and the fixed calibration block 8 gradually change from line contact to surface contact with the part to be calibrated 5.

[0042] In order to avoid damaging the part 5 to be calibrated, the diameter of the roundness safety rod 3 is adapted to the thickness of the part 5 to be calibrated, and both ends of the roundness safety rod 3 are provided with arc surfaces adapted to the inner diameter of the part 5 to be calibrated, and the length of the roundness safety rod 3 is slightly smaller than the inner diameter of the part 5 to be calibrated by 1 to 2 mm. By providing the arc surface, the contact surface is increased, the pressure is distributed, and the part 5 to be calibrated is prevented from being damaged.

[0043] The greater the deformation of the part 5 to be calibrated, the greater the springback during calibrating. There are multiple calibrating safety rods 3 with different lengths. When calibrating, the length of the calibrating safety rod 3 is selected according to the deformation size to calibrate the part 5 to be calibrated. The greater the deformation, the shorter the length of the calibrating safety rod 3 is selected. After the parts are measured after calibrating, if they occasionally fail to meet the standards, a calibrating safety rod 3 with a suitable length is selected for secondary calibration until the parts pass the inspection.

[0044] In some embodiments, there are four cylindrical protrusions 6 , and the dynamic calibration blocks 2 and the fixed calibration blocks 8 are symmetrically distributed on the upper and lower sides of the part to be calibrated 5 , and the dynamic calibration blocks 2 and the fixed calibration blocks 8 are staggered with respect to the cylindrical protrusions 6 .

[0045] In some embodiments, a transition connector 1 is also included, and a dynamic calibration circular block 2 is fixedly connected to the transition connector 1 by means of a hexagon socket screw, and the transition connector 1 is fixedly connected to a workbench on the hydraulic press.

[0046] Among them, the dynamic calibration block 2, calibration disc 4, columnar protrusion 6, fixed seat 7 and fixed calibration block 8 are all made of mold steel material H13 with good stability after heat treatment, and the heat treatment hardness is HRC48-52. The calibration safety rod 3 is made of quenched and tempered 45 steel. After heat treatment, each part needs to be finely processed to ensure that each size meets the design requirements.

[0047] Working principle:

[0048] When calibrating a thin-walled elliptical deformed part, the part to be calibrated 5, which has been inspected and marked with the direction of the elliptical major axis, is placed on the two cylindrical protrusions 6 below the calibration disc 4 in the vertical direction. At this time, the outer diameter of the part to be calibrated 5 only contacts the inner curved surface of the two cylindrical protrusions 6 below the calibration disc 4. Then, the calibration safety rod 3 is vertically placed into the part to be calibrated 5.

[0049] Operate the hydraulic press, and drive the dynamic rounding block 2 to move downward slowly through the transition connector 1. The inner curved surfaces of the two cylindrical protrusions 6 below the rounding disc 4 receive the component force of the hydraulic press transmitted by the part to be rounded 5 and gradually increase it. The elastic member 9 begins to deform under force, and the rounding disc 4 and the part to be rounded 5 begin to move downward as a whole. As the downward movement increases, the outer wall of the part to be rounded 5 begins to contact the inner curved surface of the fixed rounding block 8. Since the fixed rounding block 8 and the fixed seat 7 are rigidly assembled, the part to be rounded 5 begins to receive the action force of the inner curved surface of the dynamic rounding block 2 and the reaction force of the inner curved surface of the fixed rounding block 8 in the vertical direction. The part to be rounded 5 begins to deform. As the dynamic rounding block 2 continues to descend, the action force and reaction force received by the part to be rounded 5 gradually increase, and the ellipse of the part to be rounded 5 begins to slowly become round, that is, the outer diameter of the part to be rounded 5 in the vertical direction gradually decreases, and the outer diameter in the horizontal direction gradually increases.

[0050] When the outer diameters of the part 5 to be rounded are consistent in the vertical and horizontal directions, the movable rounding block 2 will continue to move downward due to the rebound effect of the part 5 to be rounded until the inner wall of the part 5 to be rounded contacts the arc surfaces at both ends of the rounding safety rod 3, and the rounding is considered to have met the requirements;

[0051] The hydraulic press drives the dynamic roundness correction block 2 to move upward and reset. When the dynamic roundness correction block 2 starts to move upward, the elastic member 9 releases the pressure synchronously, and lifts the roundness correction disc 4 together with the rounded parts until they return to the natural state. At this time, the rounded parts are removed and the next part to be rounded 5 is reinstalled. The above operation is repeated to carry out cyclic and continuous operation.

[0052] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for rounding thin-walled parts, characterized in that: include: Fixed seat (7); A calibration disc (4), the calibration disc (4) being arranged above the fixing seat (7) in a sliding manner in a vertical direction, and an elastic member (9) for driving the calibration disc (4) to reset is provided between the calibration disc (4) and the fixing seat (7); A columnar protrusion (6), wherein there are a plurality of the columnar protrusions (6), the plurality of the columnar protrusions (6) are evenly fixedly connected to the disk surface of the calibration disk (4) along the circumference of the calibration disk (4), and the plurality of the columnar protrusions (6) are symmetrically distributed along the perpendicular midline of the calibration disk (4), and the plurality of the columnar protrusions (6) cooperate to position the part (5) to be calibrated; A roundness calibration safety rod (3), wherein the roundness calibration safety rod (3) is arranged vertically on the inner side of the part (5) to be rounded; A movable calibration block (2) and a fixed calibration block (8), wherein the fixed calibration block (8) is rigidly connected to a fixed seat (7), and the movable calibration block (2) is driven down by a driving mechanism to cooperate with the fixed calibration block (8) to apply pressure to the part to be calibrated (5) for calibration.

2. A thin-walled parts rounding device according to claim 1, characterized in that: A rectangular protrusion (12) is provided on one radial side of the calibration disc (4), a first cavity (10) adapted to the rectangular protrusion (12) is provided on the upper surface of the fixing seat (7), and the elastic member (9) is located inside the first cavity (10).

3. A thin-walled parts rounding device according to claim 2, characterized in that: A gap is provided between the shoulder planes on both sides of the rectangular protrusion (12) and the upper plane of the fixing seat (7), and the width of the gap is 5 to 6 mm.

4. A thin-walled parts rounding device according to claim 1, characterized in that: The upper surface of the fixing seat (7) is provided with a second cavity (11) adapted to fit the calibration circular block (8).

5. A thin-walled parts rounding device according to claim 1, characterized in that: The elastic member (9) is a polyurethane elastic block.

6. A thin-walled parts rounding device according to claim 1, characterized in that: The side of the movable rounding block (2), the columnar protrusion (6) and the fixed rounding block (8) acting on the part to be rounded (5) is provided with an inner curved surface matching the outer diameter of the part to be rounded (5).

7. A thin-walled parts rounding device according to claim 1, characterized in that: The diameter of the roundness calibration safety rod (3) is matched to the thickness of the part (5) to be rounded, both ends of the roundness calibration safety rod (3) are provided with arc-shaped surfaces matched to the inner diameter of the part (5) to be rounded, and the length of the roundness calibration safety rod (3) is slightly smaller than the inner diameter of the part (5) to be rounded by 1 to 2 mm.

8. The thin-walled parts rounding device according to claim 1, characterized in that: There are four columnar protrusions (6), and the movable calibration blocks (2) and the fixed calibration blocks (8) are symmetrically distributed on the upper and lower sides of the part to be calibrated (5). The movable calibration blocks (2) and the fixed calibration blocks (8) are staggered with respect to the columnar protrusions (6).

9. A thin-walled parts rounding device according to claim 1, characterized in that: It also comprises a transition connecting piece (1), and the dynamic calibration circular block (2) is fixedly connected to the transition connecting piece (1) via a hexagon socket screw.

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