Crankshaft fillet strengthening positioning method and device

Abstract

The present invention provides a crankshaft fillet strengthening positioning method and device, which is provided with a support, a clamping claw is provided on the support, a rolling mechanism is embedded in the clamping claw, a clamping mechanism is also provided on the support, the clamping mechanism includes a hydraulic cylinder, a rotating shaft and a throwing arm, the hydraulic cylinder and the throwing arm are connected by a rotating shaft, the throwing arm is connected to the support, and an impact mechanism is also provided on the support, and the support is fixedly connected to the impact mechanism. It solves the technical problem that the rolling force of the existing rolling machine tool is difficult to meet the rolling strengthening requirements of large crankshaft fillets, so that the crankshaft fillet strengthening strength does not meet the use requirements. The present invention can be widely used in the crankshaft fillet strengthening process.

Description

Technical Field

[0001] The invention relates to a crankshaft strengthening positioning method and a device thereof, in particular to a crankshaft fillet strengthening positioning method and a device thereof. Background Art

[0002] The crankshaft is the core power output component of the internal combustion engine. For large marine crankshafts, the output load is large, and a single strengthening method is difficult to meet the strength requirements, so composite strengthening treatment is required. At present, composite strengthening treatment mainly includes gas nitriding and fillet rolling composite strengthening or induction quenching and fillet rolling composite strengthening. Each composite strengthening is inseparable from fillet rolling, and the fillet rolling of large crankshafts requires a huge rolling force. The rolling machine tools developed at home and abroad cannot meet the rolling force requirements.

[0003] In view of this situation, it is urgent to research and develop new strengthening methods and new crankshaft strengthening equipment to meet the production requirements of higher power engine crankshafts. At present, one of the more effective ways to strengthen the crankshaft fillet is impact strengthening, but the impact mechanism in the impact device requires very high precision positioning and needs to have a good connection with the crankshaft. Therefore, the strengthening positioning device becomes an important factor limiting the strengthening of the crankshaft fillet. Summary of the invention

[0004] The present invention aims to solve the technical problem that the rolling force of existing rolling machines cannot meet the rolling strengthening requirements of large crankshaft fillets, resulting in the crankshaft fillet strengthening strength failing to meet the use requirements. The present invention provides a crankshaft fillet strengthening positioning method and device that can meet the crankshaft fillet strengthening requirements, accurately position the crankshaft fillet and have a good connection relationship.

[0005] To this end, the technical solution of the present invention is a crankshaft fillet reinforcement positioning device, which is provided with a support, a claw on the support, a rolling mechanism embedded in the claw, and a clamping mechanism on the support. The clamping mechanism includes a hydraulic cylinder, a rotating shaft and a throwing arm. The hydraulic cylinder and the throwing arm are connected by a rotating shaft, and the throwing arm is connected to the support. An impact mechanism is also provided on the support, and the support is fixedly connected to the impact mechanism.

[0006] Preferably, the claw is located at the front end of the support, and the support and the claw are an integrated structure.

[0007] Preferably, the claw is in a semicircular arc shape, and the rolling mechanism includes a roller and a supporting sleeve, and the supporting sleeve and the roller are both made of hard alloy.

[0008] Preferably, the inner side of the roller contacts the supporting sleeve, and the outer side of the roller is slightly higher than the inner surface of the circular arc of the claw.

[0009] Preferably, a stepped hole is formed on the rear end surface of the support, and the impact mechanism is fixed to the support through the stepped hole.

[0010] Preferably, the impact mechanism is provided with an impact cylinder, and a hammer is provided on the impact cylinder.

[0011] A crankshaft fillet impact strengthening positioning method, the specific steps are:

[0012] (1) Clamping the crankshaft: The big end of the crankshaft is mounted on the machine tool headstock, and the center and connecting plate on the machine tool cooperate with the center of the small end to achieve axial fixation of the crankshaft;

[0013] (2) Before the mechanical impact process begins, the clamping mechanism drives the support to clamp the crankshaft to achieve circumferential fixation of the crankshaft;

[0014] (3) Starting the impact cylinder, the impact cylinder drives the impact hammer to impact the rounded corner of the crankshaft, completing an impact process;

[0015] (4) After one impact process is completed, the clamping device is released, the crankshaft is rotated by a certain angle, and the circumferential positioning of the crankshaft is completed again by the clamping mechanism, and the next impact cycle begins;

[0016] The hydraulic cylinder is unloaded, and the clamping device is still in the clamping state, but the clamping force on the crankshaft is very small, ensuring that the crankshaft can smoothly rotate through a certain angle;

[0017] (5) After turning to the specified angle, the clamping device clamps the crankshaft again under the action of the hydraulic cylinder and starts the next impact cycle. This cycle is repeated to achieve mechanical strengthening impact on the crankshaft fillet.

[0018] Preferably, in step (2), the specific steps of the clamping mechanism driving the support to clamp the crankshaft are:

[0019] In the clamping mechanism, the piston rod of the hydraulic cylinder moves along the cylinder cavity under the action of the control valve, driving the throwing arm to rotate, so that the throwing arm drives the support connected to the lower end to clamp the crankshaft.

[0020] Preferably, in step (3), the specific steps of the impact mechanism impacting the crankshaft fillet are:

[0021] An external air source is connected to inflate the impact cylinder, the impact cylinder control valve is opened, and the impact cylinder piston quickly impacts the fillet of the crankshaft through the impact hammer.

[0022] The beneficial effects of the present invention are:

[0023] (1) The circumferential positioning of the crankshaft can be easily achieved by controlling the movement of the support through the hydraulic cylinder and the ejector arm of the clamping mechanism. Moreover, when the hydraulic cylinder is unloaded, the clamping device can still be in a clamped state, but the clamping force on the crankshaft is very small, which can ensure that the crankshaft can smoothly rotate through a certain angle and quickly enter the next impact cycle;

[0024] (2) By arranging a supporting sleeve and a roller on the claw, and the inner side of the roller contacts the supporting sleeve, and the outer side of the roller is slightly higher than the inner surface of the arc of the claw, it is ensured that the crankshaft can rotate relative to the support after the hydraulic cylinder is unloaded, preventing the journal and the claw from being locked or strained, and improving the impact efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the assembly structure of an embodiment of the present invention;

[0026] Figure 2 yes Figure 1 A top view of

[0027] Figure 3 is a structural diagram of a support and a claw according to an embodiment of the present invention;

[0028] Figure 4 yes Figure 3 A top view of

[0029] Figure 5 yes Figure 4 A-direction view.

[0030] Explanation of symbols in the figure:

[0031] 1. Hydraulic cylinder; 2. Rotating shaft; 3. Throwing arm; 4. Support; 5. Claw; 6. Support sleeve; 7. Roller. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with embodiments.

[0033] like Figure 1-2 As shown, a crankshaft fillet reinforcement positioning device is provided with a support 4, a claw 5 is provided on the support 4, the support 4 and the claw 5 are an integral structure, and a clamping mechanism is also provided on the support 4, the clamping mechanism includes a hydraulic cylinder 1, a rotating shaft 2 and a throwing arm 3, the hydraulic cylinder 1 and the throwing arm 3 are connected by the rotating shaft 2, and the throwing arm 3 is connected to the support 4.

[0034] like Figure 3-5 The structure diagram of the support 4 and the claw 5 is shown. The support 4 and the claw 5 are an integrated structure. The claw 5 is located at the front end of the support 4. The claw 5 is in a semicircular arc shape. The claw 5 is embedded with a support sleeve 6 and a roller 7. The support sleeve 6 and the roller 7 are made of hard alloy. The inner side of the roller 7 is in contact with the support sleeve 6, and the outer side is slightly higher than the arc surface of the claw 5 to ensure contact with the crankshaft journal; the support sleeve 6 can rotate freely along the central axis. When the crankshaft rotates, the roller 7 rotates accordingly, realizing the positioning and rolling rotation of the crankshaft and avoiding scratches on the journal surface. A stepped hole is opened on the rear end face of the support 4, and an impact mechanism is arranged in the stepped hole. The impact mechanism is provided with an impact cylinder, and a hammer is arranged on the impact cylinder. The impact mechanism is fixed to the support 4 through the stepped hole.

[0035] The specific steps for impact strengthening positioning of crankshaft fillet are:

[0036] (1) Clamping the crankshaft: The big end of the crankshaft is mounted on the machine tool headstock, and the center and connecting plate on the machine tool cooperate with the center of the small end to achieve axial fixation of the crankshaft;

[0037] (2) Before the mechanical impact process begins, the piston rod of the hydraulic cylinder 1 of the clamping mechanism moves along the cylinder cavity under the action of the control valve, driving the throwing arm 3 to rotate, so that the lower end of the throwing arm 3 is connected to the support 4 to clamp the crankshaft, thereby achieving circumferential fixation of the crankshaft;

[0038] (3) An external air source is connected to inflate the impact cylinder, the impact cylinder control valve is opened, and the cylinder piston quickly impacts the crankshaft fillet through the impact hammer;

[0039] (4) After the impact process is completed, the hydraulic cylinder 1 is unloaded, and the clamping device is still in the clamping state, but the clamping force on the crankshaft is very small, ensuring that the crankshaft can smoothly rotate through a certain angle;

[0040] (5) After turning to the specified angle, the clamping device clamps the crankshaft again under the action of hydraulic cylinder 1, and the next impact cycle begins. This cycle is repeated to achieve mechanical strengthening impact on the crankshaft fillet.

[0041] The device supports and positions the impact mechanism through the support 4 and the claw 5, and clamps the impact mechanism through the hydraulic cylinder 1 and the throwing arm 3. During operation, the throwing arm 3 rotates around the rotating shaft 2, and provides a certain clamping force during the clamping process, the magnitude of which is approximately equal to the reaction force received by the impact hammer; the support sleeve 6 and the roller 7 clamp the crankshaft to achieve circumferential positioning of the impact mechanism, ensuring that the crankshaft can rotate relative to the support 4 after the hydraulic cylinder 1 is unloaded, preventing the journal and the claw from locking or straining, and improving the impact efficiency.

[0042] However, what is described above is only a specific embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. A crankshaft fillet strengthening positioning device, characterized in that: A support is provided, the support is provided with a claw, a rolling mechanism is embedded in the claw, the support is also provided with a clamping mechanism, the clamping mechanism includes a hydraulic cylinder, a rotating shaft and a throwing arm, the hydraulic cylinder and the throwing arm are connected through the rotating shaft, the throwing arm is connected to the support, an impact mechanism is also provided on the support, and the support is fixedly connected to the impact mechanism; the claw is located at the front end of the support, and the support and the claw are an integral structure; the rolling mechanism includes a roller and a supporting sleeve, the inner side of the roller is in contact with the supporting sleeve, and the outer side of the roller is slightly higher than the inner surface of the arc of the claw.

2. The crankshaft fillet strengthening positioning device according to claim 1, characterized in that: The clamping claw is in a semicircular arc shape, and the support sleeve and the roller are both made of hard alloy.

3. The crankshaft fillet reinforcement positioning device according to claim 1, characterized in that: A stepped hole is formed on the rear end surface of the support, and the impact mechanism is fixed on the support through the stepped hole.

4. The crankshaft fillet reinforcement positioning device according to claim 1, characterized in that: The impact mechanism is provided with an impact cylinder, and a hammer is provided on the impact cylinder.

5. A method for impact strengthening positioning of crankshaft fillet, characterized in that: The specific steps are: (1) Clamping the crankshaft: The big end of the crankshaft is mounted on the machine tool headstock, and the center and connecting plate on the machine tool cooperate with the center of the small end to achieve axial fixation of the crankshaft; (2) Before the mechanical impact process begins, the clamping mechanism drives the support to clamp the crankshaft to achieve circumferential fixation of the crankshaft. The specific steps are as follows: In the clamping mechanism, the piston rod of the hydraulic cylinder moves along the cylinder cavity under the action of the control valve, driving the throwing arm to rotate, so that the throwing arm drives the support connected to the lower end to clamp the crankshaft, and the support sleeve and roller clamp the crankshaft to achieve the circumferential positioning of the impact mechanism; (3) Starting the impact cylinder, the impact cylinder drives the impact hammer to impact the rounded corner of the crankshaft, completing an impact process; (4) After one impact process is completed, the clamping device is released, the crankshaft is rotated by a certain angle, and the circumferential positioning of the crankshaft is completed again by the clamping mechanism, and the next impact cycle begins; The hydraulic cylinder is unloaded, and the clamping device is still in the clamping state, but the clamping force on the crankshaft is very small, ensuring that the crankshaft can smoothly rotate through a certain angle; (5) After turning to the specified angle, the clamping device clamps the crankshaft again under the action of the hydraulic cylinder and starts the next impact cycle. This cycle is repeated to achieve mechanical strengthening impact on the crankshaft fillet.

6. The method for strengthening the positioning of crankshaft fillet according to claim 5, characterized in that: The specific steps of the impact mechanism impacting the crankshaft fillet in step (3) are: An external air source is used to inflate the impact cylinder, the impact cylinder control valve is opened, and the impact cylinder piston quickly impacts the fillet of the crankshaft through the impact hammer.

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