Eccentric shaft lathe machining clamp

Abstract

The utility model relates to the technical field of machining fixtures, in particular to an eccentric shaft lathe machining fixture, which comprises an eccentric chuck, an eccentric shaft, a lathe fixture, an eccentric shaft and a lathe fixture. One end of the connecting plate is provided with a first through hole matched with the shaft diameter of the eccentric chuck, and the other end of the connecting plate is provided with a second through hole matched with the shaft diameter of a main journal of the eccentric shaft; the hole distance between the first through hole and the second through hole is equal to the eccentric distance of the eccentric shaft; the first through hole is arranged on the eccentric chuck in a sleeving manner and is fixed, and the second through hole is formed by connecting two semicircular holes by arranging a fastening screw; the positioning plate is fixedly installed at the end, opposite to the end where the center hole is formed, of the eccentric chuck and is provided with a crank arm surrounding structure formed by three positioning parts, and each positioning part is provided with a self-aligning screw; the clamp disclosed by the utility model can be directly clamped on the eccentric shaft, and the eccentric chuck can be directly arranged on a lathe clamping jaw and can also be directly matched with a lathe tailstock ejector pin.

Description

TECHNICAL FIELD

[0001] The utility model relates to lathe fixture technical field, especially a eccentric shaft lathe machine processing fixture. BACKGROUND

[0002] When the eccentric shaft is processed on the horizontal lathe, the center hole is needed to be processed on the both ends of the shaft, and the tailstock of the lathe is positioned by the eccentric center hole, and the eccentric shaft neck is processed, but the current method is not suitable when the eccentric distance is large.

[0003] The utility model discloses a lathe fixture for adjusting eccentric distance of eccentric shaft part positioning, which is installed on the headstock and tailstock rotary spindle of a lathe and used when processing the eccentric shaft neck of the eccentric shaft part. The lathe fixture uses measuring instruments and measuring rods to accurately observe the distance between the axis of the mounting hole of the eccentric shaft part and the rotary axis, and then adjusts the distance through the fine adjustment screw to make it consistent with the eccentric distance of the eccentric shaft part, so that the axis of the eccentric shaft neck is coincident with the rotary axis. The lathe spindle is usually provided with a chuck, and it is relatively easy to install the above-mentioned lathe fixture (the installation method is not specified in the specification), but for some lathes with only a tailstock pin, the installation of the above-mentioned lathe fixture at the tailstock pin of the lathe becomes a problem. UTILITY MODEL CONTENTS

[0004] The utility model discloses a lathe fixture for eccentric shaft, which solves the problems in the prior art. In order to achieve the above-mentioned purpose, the utility model solves the problems through the following technical solutions:

[0005] The utility model provides a lathe fixture for eccentric shaft, which comprises:

[0006] The eccentric chuck is a rotary shaft part, and one end thereof is provided with a center hole.

[0007] The at least one connecting plate has a first through hole with a diameter adapted to the eccentric chuck at one end and a second through hole with a diameter adapted to the eccentric shaft neck at the other end. The distance between the first through hole and the second through hole is equal to the eccentric distance of the eccentric shaft. The first through hole is sleeved on the eccentric chuck and fixed, and the second through hole is formed by connecting two semicircular holes through a fastening screw.

[0008] The positioning plate is fixedly installed on the opposite end of the eccentric chuck provided with the center hole, has a curved arm surrounding structure formed by three positioning parts, and each positioning part is provided with a centering screw.

[0009] As a further technical solution, the eccentric chuck is provided with four clamping surfaces on the outer circle of the end provided with the center hole.

[0010] As a further technical scheme, the connecting plate comprises a connecting plate body and a cover plate, each of which has a semicircular hole, and the two holes together form the second through hole.

[0011] As a further technical scheme, the positioning plate has a flat plate, and the three edges of the flat plate are provided with the positioning parts, and a through hole is formed in the center of the flat plate and is sleeved on the eccentric chuck.

[0012] As a further technical scheme, the positioning plate is welded on the eccentric chuck through the flat plate.

[0013] As a further technical scheme, the connecting plate is welded on the eccentric chuck.

[0014] As a further technical scheme, two connecting plates are arranged on the eccentric chuck at a distance.

[0015] The beneficial effects of the above-mentioned utility model are as follows:

[0016] The eccentric shaft lathe machining clamp can be directly clamped on the eccentric shaft part to be machined, and the eccentric chuck of the clamp can be directly installed on the lathe jaw or directly matched with the tailstock pin of the lathe, which is easier to clamp than the prior art. Meanwhile, the clamp has a connecting plate matched with the eccentric chuck, and the connecting plate can be connected with the eccentric shaft main journal, so as to ensure that the center distance between the eccentric chuck and the eccentric shaft main journal is equal to the eccentric distance of the eccentric shaft, and then the centering screw on the positioning plate is adjusted to make the rotary center of the eccentric chuck concentric with the eccentric shaft journal, and after installation, the eccentric shaft journal is used as the rotary center to perform turning machining on the eccentric shaft journal, and the shortcomings in the prior art are overcome. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of the present utility model form a part of the present utility model and serve to provide further understanding of the present utility model, and the illustrative embodiments of the present utility model and their description serve to explain the present utility model, and do not constitute limitations on the present utility model. It should also be understood that these drawings are shown for simplicity and clarity, and are not necessarily drawn to scale. The present utility model will now be described and explained in additional features and details by using the accompanying drawings, in which:

[0018] Figure 1 A typical eccentric shaft structure schematic diagram to which the eccentric shaft lathe machining clamp of the present utility model is directed is shown;

[0019] Figure 2 A front view of the eccentric shaft lathe machining clamp and the eccentric shaft after assembly is shown;

[0020] Figure 3 Figure 2 shows the shaft side view of the eccentric shaft lathe machining fixture and eccentric shaft assembly in the embodiment of the utility model;

[0021] Figure 4 Figure 3 shows the side view of the positioning plate in the embodiment of the utility model;

[0022] Figure 5 Figure 4 shows the side view of the connecting plate in the embodiment of the utility model.

[0023] In the figure: 1, eccentric shaft; 11, eccentric shaft journal; 12, main shaft journal; 13, curved arm; 2, eccentric shaft lathe machining fixture; 21, positioning plate; 211, first positioning part; 212, second positioning part; 213, third positioning part; 214, self-aligning screw; 22, connecting plate body; 23, eccentric chuck; 24, cover plate; 25, fastening screw; 26, clamping surface; 3, lathe jaw; 4, thimble. DETAILED DESCRIPTION

[0024] The technical solutions in the typical embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model.

[0025] As shown in Figure 1 , a typical eccentric shaft structure to which the present application is directed is given, which has an eccentric shaft journal 11, the two ends of the eccentric shaft journal 11 are connected with a main shaft journal 12 through a curved arm 13 respectively, and the two main shaft journals 12 are coaxial. The distance between the axis of the main shaft journal 12 and the eccentric shaft journal 11 is the eccentricity of the eccentric shaft.

[0026] In order to solve the problems in the prior art, as shown in Figure 2 and Figure 3 , the embodiment provides an eccentric shaft lathe machining fixture 2, which comprises a positioning plate 21, a connecting plate and an eccentric chuck 23.

[0027] It should be noted that in use, one eccentric shaft lathe machining fixture 2 is configured at each end of the eccentric shaft.

[0028] The eccentric chuck 23 is a rotary shaft part, one end of which is provided with a center hole, which is used for cooperation with the thimble 4 of the lathe tailstock; in the machining process of the eccentric shaft 1, either end can face the lathe tailstock, and after the eccentric shaft lathe machining fixture 2 is installed on the eccentric shaft 1, both ends have eccentric holes, which meet different machining requirements.

[0029] The eccentric chuck 23 is provided with four clamping surfaces 26 on the outer circle of the end with the center hole, and the clamping surfaces 26 are used for clamping of the lathe jaw 3.

[0030] At least one connecting plate, two connecting plates are arranged on the eccentric chuck 23 in the embodiment, and the distance between the two connecting plates is set according to actual needs. It can be understood that in other embodiments, the connecting plate can be provided with one or more than two, and is not limited to the number provided in the embodiment.

[0031] One end of the connecting plate has a first through hole matched with the shaft diameter of the eccentric chuck 23, and the other end has a second through hole matched with the shaft diameter of the main shaft neck 12 of the eccentric shaft 1; the hole distance between the first through hole and the second through hole is equal to the eccentric distance of the eccentric shaft 1. The shaft diameters of the eccentric chuck 23 and the main shaft neck 12 at different mounting positions are different, so the hole diameters of the first through hole and the second through hole are set according to the shaft diameters at the mounting positions.

[0032] The first through hole is sleeved on the eccentric chuck 23 and fixed, and in the embodiment, the connecting plate is welded on the eccentric chuck 23. The second through hole is formed by connecting two semicircular holes through a fastening screw 25. The connecting plate includes a connecting plate body 22 and a cover plate 24, the first through hole is arranged at one end of the connecting plate body 22, the other end is provided with a semicircular hole, and the cover plate 24 is also provided with a semicircular hole, the two semicircular holes together form the second through hole, and the connecting plate body 22 and the cover plate 24 are connected through the fastening screw 25. Specifically, as shown in Figure 5 The end face of one end of the connecting plate body 22 provided with the semicircular hole is symmetrically provided with two screw holes, the cover plate 24 is provided with two ears, the ears are provided with through holes, and the fastening screw 25 passes through the through holes of the ears of the cover plate 24 and cooperates with the screw holes on the connecting plate body 22.

[0033] The positioning plate 21 is fixedly installed on the opposite end of the eccentric chuck 23 provided with the center hole, has a curved arm surrounding structure formed by three positioning parts, and each positioning part is provided with a centering screw 214.

[0034] As shown in Figure 4 The three positioning parts are a first positioning part 211, a second positioning part 212 and a third positioning part 213 respectively. The positioning plate 21 has a flat plate, a through hole is formed in the center of the flat plate and the flat plate is sleeved on the eccentric chuck 23 through the through hole, and the positioning plate 21 is welded on the eccentric chuck 23 through the flat plate.

[0035] The three edges of the flat plate are provided with positioning parts, the positioning parts are strip-shaped plate structures, the positioning parts are vertically arranged with the flat plate, are distributed on two lateral edges and a top edge of the flat plate, and form a structure surrounding both sides and the top end of the curved arm 13. In the embodiment, each positioning part is provided with two centering screws 214, the center of rotation of the eccentric chuck 23 (the center of the center hole) is made concentric with the eccentric shaft neck 11 by adjusting the centering screws 214, and then the centering screws 214 are tightened.

[0036] In use, the eccentric chuck 23 and the connecting plate are mounted on the one end spindle neck 12 of the eccentric shaft 1, and are pre-fixed by the cover plate 24, and the fastening screw 25 is in the pre-pressing state at this time; the positioning plate surrounds the curved arm 13 of the eccentric shaft, and the centering screw 214 is adjusted, so that the rotation center of the eccentric chuck 23 is concentric with the eccentric shaft neck 11, the centering screw 214 is tightened, and then the fastening screw 25 is pressed; the other end of the eccentric shaft is also provided with the fixture.

[0037] In machining, the center hole of the eccentric chuck 23 is clamped by the tailstock center 4 of the lathe, and the clamping surface 26 of the eccentric chuck 23 is clamped by the lathe chuck jaw 3; the eccentric shaft neck of the workpiece is concentric with the lathe spindle through the fixture, and the eccentric shaft neck 11 can be subjected to turning machining.

[0038] The eccentric shaft lathe machining fixture 2 of the embodiment can be directly clamped on the eccentric shaft part to be machined, the eccentric chuck 23 of the fixture can be directly mounted on the lathe chuck jaw 3 or can be matched with the lathe tailstock center 4. Meanwhile, the fixture is also provided with the connecting plate matched with the eccentric chuck 23, the connecting plate can be connected with the spindle neck 12 of the eccentric shaft 1, so as to ensure that the center distance between the eccentric chuck 23 and the spindle neck 12 of the eccentric shaft 1 is equal to the eccentric distance of the eccentric shaft 1, the centering screw 214 on the positioning plate 21 is adjusted, so that the rotation center of the eccentric chuck 23 is concentric with the eccentric shaft neck 11, and after installation, the eccentric shaft neck 11 can be subjected to turning machining with the neck center of the eccentric shaft 1 as the rotation center, and the defects in the prior art are overcome.

[0039] Although the utility model has been disclosed as above with preferred embodiments, it is not intended to limit the utility model, and any person skilled in the art can make possible changes and modifications to the utility model technical scheme by using the disclosed methods and technical contents without departing from the spirit and scope of the utility model, therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model, which does not depart from the content of the utility model technical scheme, all belong to the protection scope of the utility model technical scheme.

Claims

1. An eccentric shaft lathe machine tooling fixture, characterized by, The utility model relates to a eccentric chuck for rotary shaft parts, which comprises a top hole at one end of the eccentric chuck, at least one connecting plate with a first through hole at one end and a second through hole at the other end, the first through hole being adapted to the shaft diameter of the eccentric chuck, the second through hole being adapted to the shaft diameter of the eccentric shaft journal, the distance between the first through hole and the second through hole being equal to the eccentricity of the eccentric shaft, the first through hole being sleeved on the eccentric chuck and fixed, the second through hole being formed by two semicircular holes connected by a fastening screw, a positioning plate being fixedly installed on the opposite end of the eccentric chuck with the top hole, having a three-positioning-portion-formed curved arm surrounding structure, each positioning portion having a centering screw. The eccentric chuck has four clamping surfaces on the outer circle of the end with the top hole. The connecting plate comprises a connecting plate body and a cover plate, each having a semicircular hole, which together form the second through hole, the connecting plate body and the cover plate being connected by the fastening screw. The positioning plate has a flat plate, each edge of the flat plate having a positioning portion, the center of the flat plate having a through hole, the flat plate being sleeved on the eccentric chuck through the through hole.

2. An eccentric shaft lathe machine tool fixture as claimed in claim 1, wherein, The positioning plate is welded to the eccentric chuck through the flat plate.

3. An eccentric shaft lathe machining fixture as claimed in claim 1, wherein, The connecting plate is welded to the eccentric chuck.

4. An eccentric shaft lathe machining fixture as claimed in claim 1, wherein, Two connecting plates are arranged on the eccentric chuck at a certain distance apart.

5. An eccentric shaft lathe machining fixture as claimed in claim 4, characterized in that, ​ 6. An eccentric shaft lathe machining fixture as claimed in claim 1, wherein, ​ 7. An eccentric shaft lathe machining fixture as claimed in claim 1, wherein, ​

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