Motorcycle large cradle through hole machining clamp

Abstract

The utility model provides a motorcycle large cradle through hole machining clamp which comprises a base frame, a centering mechanism and a clamping mechanism. The base frame comprises a lower base plate, supporting columns, an upper base plate and a positioning table. The three centering mechanisms are respectively arranged on the bottom surfaces of the three positioning through holes of the upper substrate, and each centering mechanism comprises an air cylinder I and a core rod; the three clamping mechanisms are arranged on the sides of the three positioning through holes of the upper base plate correspondingly and comprise air cylinders II, air cylinder seats and clamping heads. The fixing positions and heights of the clamping mechanisms meet the standard that after the large cradle blank is placed on the positioning table, semicircular notches of clamping heads of the clamping mechanisms are just in close contact with the circular-arc-shaped outlines of the outer sides of through holes in the large cradle blank, and the axes of pistons of air cylinders II of the clamping mechanisms point to the geometric center of the large cradle blank. The large cradle through hole machining tool has the advantages that it can be guaranteed that black edges which are not cut in place cannot occur in large cradle through hole machining, blanks are not prone to loosening in the machining process, and machining quality is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a motorcycle big cradle through -hole processing technology, especially to a motorcycle big cradle through -hole processing clamp. BACKGROUND

[0002] The motorcycle big cradle usually refers to the part for connecting the rear shock absorber with the frame connecting rod mounting support and the connecting rod, therefore, the motorcycle big cradle is usually triangular, and the connecting hole is arranged at the three corners of the triangle (see attached Figure 1 )。 The blank of the motorcycle big cradle usually adopts aluminum alloy die casting, and after the die casting is completed, the connecting hole and the two end faces of the big cradle are drilled and milled by machining to make the size precision of the connecting hole and the end face of the big cradle reach the design requirement.

[0003] The prior art motorcycle big cradle through -hole processing method usually adopts the three -jaw chuck after modification to clamp the big cradle blank, that is, the outer contour of the big cradle blank is divided into three sectors with a 120-degree circumferential region, and the three sector regions are processed into three corresponding top pressing plates; then, the three top pressing plates are welded on the surfaces of the three jaws of the three -jaw chuck, so that the inner space of the three top pressing plates constitutes a cavity matched with the shape of the big cradle blank, and the cavity can expand or contract (see attached Figure 2 )。 Specifically, the three -jaw chuck is rotated outward, the three top pressing plates are loosened, and the big cradle blank can be easily placed in the cavity; the three -jaw chuck is rotated inward, the three top pressing plates are tightened, and the big cradle blank is clamped and fixed. According to the process characteristics of die casting aluminum alloy, the changes of process conditions and raw materials may cause errors in the size and shape of the big cradle blank; and since the three -jaw chuck is three-jaw linkage, the jamming phenomenon between any two jaws will make the third jaw unable to move, resulting in that the third jaw is not clamped in place; as a result, two adverse consequences may occur, one is that the big cradle blank is not clamped to the set position, resulting in black edges that are not cut to the position; the other is that the big cradle blank is loose during processing, resulting in waste or accidents.

[0004] Obviously, the prior art motorcycle big cradle through -hole processing method has problems such as the possibility of black edges that are not cut to the position and the big cradle blank being loose, resulting in waste or accidents. SUMMARY

[0005] In order to solve the problems of the prior art motorcycle big cradle through -hole processing method, such as the possibility of black edges that are not cut to the position and the big cradle blank being loose, resulting in waste or accidents, the utility model provides a motorcycle big cradle through -hole processing clamp.

[0006] The utility model motorcycle big cradle through -hole processing fixture, include, base frame, centering mechanism and clamping mechanism, the base frame includes, lower base plate, support, upper base plate and positioning table, the lower base plate and upper base plate constitute frame structure through four supports, and be provided with three positioning through -holes on the upper base plate, the setting position of three positioning through -holes corresponds with three through -holes on big cradle blank, be provided with positioning table on the upper surface of positioning through -hole, the positioning table is hollow cylinder and with positioning through -hole coaxial, and the inside diameter of positioning table is greater than the inside diameter of through -hole on big cradle blank, the centering mechanism is three, is arranged respectively in the bottom surface of three positioning through -holes of upper base plate, include, cylinder I and core rod, the cylinder I piston faces up and is fixed in the bottom surface of three positioning through -holes of upper base plate respectively, and the piston passes through positioning through -hole, the core rod is the round rod of diameter and the through -hole on big cradle blank match, bottom end fixedly connected in cylinder I piston end head, the clamping mechanism is three, is arranged respectively in the side of three positioning through -holes of upper base plate, include, cylinder II, cylinder seat and clamping head, the cylinder II is fixed in the side of three positioning through -holes of upper base plate through cylinder seat respectively, the clamping head is rectangle, and the front end is provided with the semicircle of radius and the through -hole outside arc shape profile on big cradle blank match, rear end fixedly connected in cylinder II end head, the clamping mechanism fixed position and height after big cradle blank is placed on positioning table, the semicircle of each clamping mechanism clamping head is just in contact with the through -hole outside arc shape profile on big cradle blank, and each clamping mechanism cylinder II piston axis points to the geometric center of big cradle blank, big cradle blank is placed in positioning table refers to each through -hole on big cradle blank and respective corresponding positioning table axis is coaxial, and big cradle blank bottom surface and positioning table surface contact.

[0007] Further, the centering mechanism is a supporting plate structure, comprising a cylinder I, a core rod and a supporting plate, the cylinder I piston is fixed upwardly in the center of the lower base plate, and the piston end head is fixedly connected with the bottom surface of the supporting plate, the upper surface of the supporting plate is fixedly connected with three core rods, and the distribution of the three core rods corresponds to the positioning through holes on the upper base plate, the core rod is a round rod with a diameter matching the through hole on the big cradle blank, and passes through the positioning through hole on the upper base plate.

[0008] Further, the upper end of the core rod is provided with a taper, and the angle of the taper is 0.5-1.0°.

[0009] The utility model motorcycle big cradle through -hole processing fixture's beneficial technical effect can guarantee that big cradle through -hole processing will not appear the black edge of not cutting in place, and the blank is not easy to produce loosening in the processing, guarantees the processing quality. BRIEF DESCRIPTION OF DRAWINGS

[0010] ATTACH Figure 1 It is a three-dimensional schematic view of a motorcycle big cradle;

[0011] ATTACHFigure 2 is a three-dimensional schematic view of the clamping and fixing of the prior art motorcycle cradle through hole processing method;

[0012] attached Figure 3 is a three-dimensional schematic view of the motorcycle cradle through hole processing clamp of the utility model;

[0013] attached Figure 4 is a three-dimensional schematic view of the motorcycle cradle through hole processing clamp of the utility model from another angle;

[0014] attached Figure 5 is a three-dimensional schematic view of the motorcycle cradle blank placed on the positioning table of the processing clamp of the utility model;

[0015] attached Figure 6 is a three-dimensional schematic view of the clamping and fixing of the processing clamp of the utility model;

[0016] attached Figure 7 is a three-dimensional schematic view of another embodiment of the processing clamp of the utility model.

[0017] In the figure, 1 is a base frame, 1-1 is a lower base plate, 1-2 is a support column, 1-3 is an upper base plate, and 1-4 is a positioning table; 2 is a centering mechanism, 2-1 is a cylinder I, 2-2 is a core rod, and 2-3 is a supporting plate; the clamping mechanism 3, 3-1 is a cylinder II, 3-2 is a cylinder seat, and 3-3 is a clamping head; A is a cradle blank.

[0018] The motorcycle cradle through hole processing clamp of the utility model will be further described below in combination with the drawings and the specific embodiments. Specific embodiments

[0019] See attached Figure 3 , 4, 5 and 6, the utility model motorcycle big cradle through -hole processing clamp, including, base frame 1, centering mechanism 2 and clamping mechanism 3, the base frame includes, lower base plate 1-1, pillar 1-2, upper base plate 1-3 and positioning table 1-4, the lower base plate and upper base plate constitute frame structure through four pillars, and be provided with three positioning through -holes on upper base plate, the setting position of three positioning through -holes corresponds with three through -holes on big cradle blank, be provided with positioning table on the upper surface of positioning through -hole, the positioning table is hollow cylinder and with positioning through -hole coaxial, and the inside diameter of positioning table is greater than the inside diameter of through -hole on big cradle blank, the centering mechanism is three, respectively set up in the bottom surface of three positioning through -holes of upper base plate, including, cylinder I 2-1 and core rod 2-2, the cylinder I piston faces up and is fixed in the bottom surface of three positioning through -holes of upper base plate respectively, and the piston passes through positioning through -hole, the core rod is the round rod of diameter and the through -hole on big cradle blank match, and bottom end fixedly connected in cylinder I piston end head, the clamping mechanism is three, respectively set up in the side of three positioning through -holes of upper base plate, including, cylinder II 3-1, cylinder seat 3-2 and clamping head 3-3, the cylinder II is fixed in the side of three positioning through -holes of upper base plate through cylinder seat respectively, the clamping head is rectangle, and front end is provided with semicircle lack of radius and the through -hole outside arc shape profile on big cradle blank match, and rear end fixedly connected in cylinder II end head, the fixed position and height of clamping mechanism are after big cradle blank is placed on positioning table, and the semicircle lack of each clamping mechanism clamping head just with the through -hole outside arc shape profile on big cradle blank close contact, and each clamping mechanism cylinder II piston axis points to the geometric center of big cradle blank, the big cradle blank is placed on positioning table refers to each through -hole on big cradle blank and respective corresponding positioning table axis coaxial, and big cradle blank bottom surface and positioning table surface contact. Figure 5 ); open cylinder II, and cylinder II piston promotes clamping head and fixes and clamps big cradle blank from three directions, thereby, realize the clamping fixation of big cradle blank; open cylinder I, and cylinder I piston drives core rod and exits big cradle blank through -hole, thereby, realize the accurate positioning and fixed clamping of big cradle blank (see Figure 6) can be machined. From the above process, it can be seen that, due to the adoption of the core rod positioning, the positioning is accurate when the large cradle blank is clamped; due to the adoption of the three clamping mechanisms for clamping the large cradle blank from three directions, and the thrust forces applied are all directed to the geometric center of the large cradle blank; therefore, the clamping will not cause the individual clamping head to be not clamped in place due to the size and shape error of the large cradle blank, and the large cradle blank will not be loose during the machining process. It can be seen that the motorcycle large cradle through hole machining clamp can ensure that the machining of the large cradle through hole will not appear the black edge that is not machined in place, and the blank is not easy to be loose during the machining process, and the machining quality is ensured.

[0020] Referring to the accompanying drawings Figure 7 As one of the preferred technical solutions, the centering mechanism is a supporting plate structure, comprising a cylinder I 2-1, a core rod 2-2 and a supporting plate 2-3; the cylinder I piston is fixed upwards at the center of the lower base plate, and the piston end is fixedly connected with the bottom surface of the supporting plate; the upper surface of the supporting plate is fixedly connected with three core rods, and the distribution of the three core rods corresponds to the positioning through hole on the upper base plate; the core rod is a circular rod with a diameter matched with the through hole on the large cradle blank, and passes through the positioning through hole on the upper base plate. The adoption of the supporting plate structure can save two cylinders, thereby reducing the manufacturing cost, reducing the difficulty of manufacturing and maintenance, and more capable of ensuring the consistency of the movement of the three core rods.

[0021] As one of the preferred technical solutions, the upper end of the core rod is provided with a taper, and the angle of the taper is 0.5-1.0°. In this way, the large cradle blank with different size tolerances can be satisfied, and the through hole of the large cradle blank can be better guaranteed to be coaxial with the axis of the machining tool.

[0022] Obviously, the beneficial technical effects of the motorcycle large cradle through hole machining clamp are that the machining of the large cradle through hole will not appear the black edge that is not machined in place, and the blank is not easy to be loose during the machining process, and the machining quality is ensured.

Claims

1. A jig for machining through holes in a motorcycle cradle, characterized in that, The machining fixture includes a base frame, a centering mechanism, and a clamping mechanism. The base frame includes a lower base plate, support columns, an upper base plate, and a positioning stage. The lower and upper base plates form a frame structure through four support columns, and three positioning through holes are provided on the upper base plate. The positions of the three positioning through holes correspond to the three through holes on the large rocker blank. A positioning stage is provided on the upper surface of the positioning through holes. The positioning stage is a hollow cylinder and coaxial with the positioning through holes, and the inner diameter of the positioning stage is larger than the inner diameter of the through holes on the large rocker blank. The centering mechanism consists of three parts, each located on the bottom surface of the three positioning through holes on the upper base plate. Each part includes a cylinder I and a core rod. The piston of cylinder I is fixed upwards on the bottom surface of the three positioning through holes on the upper base plate, and the piston passes through the positioning through holes. The core rod is a round rod with a diameter matching the through holes on the large rocker blank, and its bottom end is fixedly connected to the piston of cylinder I. The clamping mechanism comprises three parts, each located beside one of the three positioning through holes on the upper substrate. Each part includes a cylinder II, a cylinder seat, and a clamping head. The cylinder II is fixed to the sides of the three positioning through holes on the upper substrate via the cylinder seat. The clamping head is rectangular, with a semi-circular notch at the front end whose radius matches the outer arc-shaped contour of the through hole on the large cradle blank, and its rear end is fixedly connected to the end of cylinder II. The clamping mechanism is fixed in position and height such that, after the large cradle blank is placed on the positioning platform, the semi-circular notch of each clamping head is in close contact with the outer arc-shaped contour of the through hole on the large cradle blank, and the piston axis of each clamping cylinder II points to the geometric center of the large cradle blank. Placing the large cradle blank on the positioning platform means that each through hole on the large cradle blank is coaxial with its corresponding positioning platform axis, and the bottom surface of the large cradle blank is in contact with the surface of the positioning platform.

2. The motorcycle cradle through-hole machining fixture according to claim 1, characterized in that, The centering mechanism is a support plate structure, including cylinder I, a core rod, and a support plate; the piston of cylinder I is fixed upward at the center of the lower base plate, and the piston end is fixedly connected to the bottom surface of the support plate; three core rods are fixedly connected to the upper surface of the support plate, and the distribution of the three core rods corresponds to the positioning through holes on the upper base plate; the core rods are round rods with a diameter matching the through holes on the large rocker blank, and pass through the positioning through holes on the upper base plate.

3. The jig for machining through holes in a motorcycle rocker arm according to claim 1 or 2, characterized in that, The upper end of the core rod is tapered, and the angle of the tapered angle is 0.5 to 1.0°.

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