Crankshaft drilling and milling positioning tool

Abstract

The utility model discloses a crankshaft drilling and milling positioning tool, which aims to position and fix a crankshaft, expose the periphery of the crankshaft and facilitate processing, and adopts the technical scheme that the crankshaft drilling and milling positioning tool comprises a machine base, a clamping seat body and a movable seat body are arranged on the machine base, a positioning jig is arranged on the clamping seat body, and the movable seat body is arranged on the movable seat body. The positioning jig comprises a first shaft body, a second shaft body and a third shaft body which are in butt joint in sequence, the outer diameter of the first shaft body is smaller than that of the second shaft body, the outer diameter of the second shaft body is smaller than that of the third shaft body, a positioning key used for positioning a crankshaft is arranged on the second shaft body, and the crankshaft is arranged on the third shaft body in a sleeving mode; the movable seat body is provided with a positioning cone opposite to the positioning jig, the movable seat body can be driven by a driving unit to be close to or far away from the clamping seat body, and the tip end of the positioning cone can make contact with the end face of the crankshaft so that the crankshaft can be tightly pressed on the positioning jig.

Description

Technical Field

[0001] This utility model belongs to the field of machining fixture technology, and more specifically, relates to a crankshaft drilling and milling positioning fixture. Background Technology

[0002] After the crankshaft is formed, it needs to be drilled and milled to make some holes and slots. Generally, the machining is carried out on the outer circumference of the crankshaft. During the machining process, the crankshaft needs to be positioned and fixed.

[0003] Patent CN202021924596.1 discloses a precision crankshaft positioning machining device for compressors, including a positioning clamping mechanism, a waste collection mechanism, and a machining forming mechanism. The waste collection mechanism is installed below the positioning clamping mechanism; the machining forming mechanism is installed on one side of the waste collection mechanism. The positioning clamping mechanism includes a sleeve, an eccentric shaft, a milled groove, a drilled hole, a shaft hole, a positioning groove I, a fixture, a pin groove, a positioning groove II, a positioning key, a pin key, and a cooling pipe. The fixture is fixed inside the sleeve; the pin key is installed in the pin groove and engages with the sleeve; the tail end of the fixture is provided with a positioning groove II; the eccentric shaft is fixed inside the fixture; the tail end of the eccentric shaft is provided with a positioning groove I; positioning groove I and positioning groove II are fixedly connected by a positioning key; the eccentric shaft is provided with a milled groove.

[0004] The aforementioned positioning and machining device uses clamping to position and fix the crankshaft. However, in actual machining, some positions are close to the position where the crankshaft is clamped, making it difficult for the drill bit or milling cutter to make a cut. Therefore, it is necessary to find a crankshaft positioning fixture that does not obscure the crankshaft and can accurately position it. Utility Model Content

[0005] The main purpose of this utility model is to provide a crankshaft drilling and milling positioning fixture, which aims to position and fix the crankshaft while exposing the outer periphery of the crankshaft for easy processing.

[0006] According to a first aspect of the present invention, a crankshaft drilling and milling positioning fixture is provided, including a base, a clamping seat and a movable seat on the base, a positioning fixture on the clamping seat, and the positioning fixture including a first shaft, a second shaft and a third shaft connected in sequence, wherein the outer diameter of the first shaft is smaller than the outer diameter of the second shaft, the outer diameter of the second shaft is smaller than the outer diameter of the third shaft, the second shaft is provided with a positioning key for positioning the crankshaft, and the third shaft is for mounting the crankshaft.

[0007] The movable seat is provided with a positioning cone opposite to the positioning fixture. The movable seat can move closer to or away from the clamping seat under the drive of a driving unit. The tip of the positioning cone can contact the crankshaft end face to press the crankshaft onto the positioning fixture.

[0008] In the aforementioned crankshaft drilling and milling positioning fixture, the second shaft body is provided with a keyway, and the positioning key is detachably installed in the keyway. The outer wall of the second shaft body is provided with an annular groove, which communicates with the keyway, and the depth of the annular groove is greater than the depth of the keyway.

[0009] In the aforementioned crankshaft drilling and milling positioning fixture, a flange is provided at the end of the first shaft away from the second shaft, and the flange is fixedly connected to the clamping base.

[0010] In the aforementioned crankshaft drilling and milling positioning fixture, a reinforcing rib is provided between the outer wall of the first shaft and the flange.

[0011] In the crankshaft drilling and milling positioning fixture described above, the cross-section of the reinforcing rib in the direction perpendicular to the axis of the first shaft gradually increases along the direction close to the flange.

[0012] In the aforementioned crankshaft drilling and milling positioning fixture, a fourth shaft is provided at the end of the third shaft that is away from the second shaft, and the outer diameter of the fourth shaft is smaller than the outer diameter of the third shaft.

[0013] In the aforementioned crankshaft drilling and milling positioning fixture, the positioning fixture is provided with a gas flow channel that extends along its axial direction, the clamping base is provided with a cavity that opens toward the positioning fixture, and the clamping base is provided with a ventilation channel that connects the cavity to the outside, the ventilation channel being used to connect with an external gas supply device.

[0014] One of the above-described technical solutions of this utility model has at least one of the following advantages or beneficial effects:

[0015] In this invention, a second shaft is provided, and the end face of the crankshaft has a corresponding groove, which can be fitted onto the second shaft to complete the initial positioning. At the same time, a positioning key is provided, and the keyway of the crankshaft can cooperate with the positioning key to make the crankshaft accurately positioned and facilitate finding the reference. Furthermore, the positioning cone can be pressed onto the crankshaft, and the positioning fixture can cooperate with the positioning cone to clamp the crankshaft, thereby fixing the crankshaft. In this way, the outer periphery of the crankshaft is exposed, which facilitates subsequent drilling and milling. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0017] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present utility model;

[0018] Figure 2 This is a cross-sectional view of the clamping base and positioning fixture in the first embodiment of this utility model.

[0019] Figure 3This is a schematic diagram of the positioning fixture according to the first embodiment of this utility model.

[0020] The figure labels for each figure are as follows:

[0021] 1. Base; 2. Clamping seat; 21. Cavity; 22. Air passage; 3. Movable seat; 31. Positioning cone; 4. Positioning fixture; 41. First shaft; 42. Second shaft; 421. Keyway; 422. Annular groove; 43. Third shaft; 44. Flange; 45. Reinforcing rib; 46. Fourth shaft; 47. Gas passage; 5. Positioning key; 6. Drive unit. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] The following disclosure provides many different implementation methods or examples for different solutions to implement this utility model.

[0024] Reference Figures 1 to 3 As shown, a crankshaft drilling and milling positioning fixture includes a base 1, a clamping seat 2 and a movable seat 3 on the base 1, a positioning fixture 4 on the clamping seat 2, and a positioning fixture 4 including a first shaft 41, a second shaft 42 and a third shaft 43 connected in sequence. The outer diameter of the first shaft 41 is smaller than the outer diameter of the second shaft 42, the outer diameter of the second shaft 42 is smaller than the outer diameter of the third shaft 43, the second shaft 42 is provided with a positioning key 5 for positioning the crankshaft, and the third shaft 43 is for mounting the crankshaft.

[0025] The movable seat 3 is provided with a positioning cone 31 opposite to the positioning fixture 4. The movable seat 3 can move closer to or away from the clamping seat 2 under the drive of a driving unit 6. The tip of the positioning cone 31 can contact the crankshaft end face to press the crankshaft onto the positioning fixture 4.

[0026] The crankshaft to be clamped in this application has a groove on its end face, and the groove wall is provided with a keyway 421. This application designs a first shaft body 41 and a second shaft body 42. The first shaft body 41 is mainly extended so that the second shaft body 42 is away from the clamping seat 2. The crankshaft can be fitted onto the second shaft body 42 to complete the initial positioning. At the same time, a positioning key 5 is provided. The keyway 421 of the crankshaft can cooperate with the positioning key 5 to make the crankshaft accurately positioned and facilitate finding the reference. In addition, the positioning cone 31 can be pressed onto the crankshaft. The positioning fixture 4 cooperates with the positioning cone 31 to clamp the crankshaft, thereby fixing the crankshaft. In this way, the outer periphery of the crankshaft is exposed, which is convenient for subsequent drilling and milling.

[0027] In this embodiment, the second shaft 42 is provided with a keyway 421, and the positioning key 5 is detachably installed in the keyway 421. The outer wall of the second shaft 42 is provided with an annular groove 422, which communicates with the keyway 421. The depth of the annular groove 422 is greater than the depth of the keyway 421. The positioning key 5 can be lifted through the annular groove 422, which makes it convenient to replace positioning keys 5 of different thicknesses while maintaining the accuracy of the positioning key 5.

[0028] In this embodiment, a flange 44 is provided at the end of the first shaft 41 away from the second shaft 42. The flange 44 is fixedly connected to the clamping base 2 and can be fixed to the clamping base 2 by screws.

[0029] Meanwhile, in order to improve the rigidity and stability of the first shaft 41, a reinforcing rib 45 is provided between the outer wall of the first shaft 41 and the flange 44 to reduce the vibration of the first shaft 41 during crankshaft machining.

[0030] In this embodiment, the cross section of the reinforcing rib 45 in the direction perpendicular to the axis of the first shaft 41 gradually increases in the direction close to the flange 44, so that the center of gravity of the positioning fixture 4 is as close as possible to the clamping seat 2; at the same time, the end of the reinforcing rib 45 near the second shaft 42 can serve as a limit, and when the crankshaft is sleeved on the second shaft 42, it can be pressed against the reinforcing rib 45.

[0031] In this embodiment, a fourth shaft 46 is provided at the end of the third shaft 43 away from the second shaft 42, and the outer diameter of the fourth shaft 46 is smaller than the outer diameter of the third shaft 43.

[0032] The positioning fixture 4 is provided with a gas flow channel 47 that runs through it along its axis. The clamping body 2 is provided with a cavity 21 that opens toward the positioning fixture 4. The clamping body 2 is provided with a ventilation channel 22 that connects the cavity 21 to the outside. The ventilation channel 22 is used to connect with an external gas supply device.

[0033] The fourth shaft 46 and the groove of the crankshaft form a cavity. After the machining is completed, air is supplied to the cavity 21 through an external air supply device. The gas in the cavity 21 can enter the cavity, thereby pushing the crankshaft away from the second shaft 42. The crankshaft can be removed without using brute force.

[0034] In this embodiment, the base 1 is provided with a guide rail, the movable seat 3 is slidably engaged with the guide rail, the drive unit 6 is a screw and nut mechanism, the movable seat 3 is connected to the nut, the screw can be manually rotated or electrically driven to move the nut, thereby allowing the movable seat 3 to translate along the guide rail.

[0035] In other embodiments, the drive unit 6 may also be a rack and pinion mechanism, a hydraulic cylinder or a pneumatic cylinder, which can be selected according to actual needs.

[0036] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A crankshaft drilling and milling positioning fixture, characterized in that, The device includes a base, on which a clamping body and a movable body are provided. The clamping body is provided with a positioning fixture. The positioning fixture includes a first shaft, a second shaft, and a third shaft that are connected in sequence. The outer diameter of the first shaft is smaller than the outer diameter of the second shaft, and the outer diameter of the second shaft is smaller than the outer diameter of the third shaft. The second shaft is provided with a positioning key for positioning the crankshaft, and the third shaft is for mounting the crankshaft. The movable seat is provided with a positioning cone opposite to the positioning fixture. The movable seat can move closer to or away from the clamping seat under the drive of a driving unit. The tip of the positioning cone can contact the crankshaft end face to press the crankshaft onto the positioning fixture.

2. The crankshaft drilling and milling positioning fixture according to claim 1, characterized in that, The second shaft is provided with a keyway, and the positioning key is detachably installed in the keyway. The outer wall of the second shaft is provided with an annular groove, which communicates with the keyway. The depth of the annular groove is greater than the depth of the keyway.

3. The crankshaft drilling and milling positioning fixture according to claim 1, characterized in that, A flange is provided at the end of the first shaft away from the second shaft, and the flange is fixedly connected to the clamping base.

4. The crankshaft drilling and milling positioning fixture according to claim 3, characterized in that, A reinforcing rib is provided between the outer wall of the first shaft and the flange.

5. The crankshaft drilling and milling positioning fixture according to claim 4, characterized in that, The cross-section of the reinforcing rib in the direction perpendicular to the axis of the first shaft gradually increases towards the flange.

6. The crankshaft drilling and milling positioning fixture according to claim 1, characterized in that, The third shaft has a fourth shaft at the end away from the second shaft, and the outer diameter of the fourth shaft is smaller than the outer diameter of the third shaft.

7. The crankshaft drilling and milling positioning fixture according to claim 1 or 6, characterized in that, The positioning fixture is provided with a gas flow channel that runs through it along its axial direction. The clamping base is provided with a cavity that opens toward the positioning fixture. The clamping base is provided with a ventilation channel that connects the cavity to the outside. The ventilation channel is used to connect with an external gas supply device.

Images