CN203304936U - Cross shaft step face machining clamp - Google Patents

Abstract

The utility model provides a cross-axis step surface processing fixture, which belongs to the technical field of tooling fixtures. Including the clamp body, positioning device and clamping device; the clamp body is a platform support structure with a through hole Ⅰ in the center, and cylindrical bosses with a through hole Ⅱ inside are symmetrically distributed on both sides of the through hole Ⅰ; The bottom of the side leg is a convex flat bottom structure, and there are V-shaped block grooves and U-shaped grooves symmetrically located between the clamp body and the center line of the through hole Ⅰ; the positioning device is composed of a V-shaped block and a mandrel, and the V-shaped blocks are symmetrically distributed on the In the V-shaped block groove of the clamp body; the mandrel is a stepped structure, and the end with a small diameter can be installed in the through hole Ⅰ of the clamp body; the clamping device is composed of a hook-shaped pressure plate, bolts and nuts, and a through hole Ⅲ is arranged inside The hook-shaped pressure plate is placed in the through hole II of the cylindrical boss, and the bolt passes through the through hole III of the hook-shaped pressure plate and is used in conjunction with the nut to clamp the workpiece. The utility model has the advantages of simple structure, convenient operation, easy guarantee of processing precision, economical and practical, and the like.

Description

A cross-axis step surface processing fixture

technical field

The utility model relates to a fixture for clamping a workpiece, in particular to a cross-axis step surface processing fixture for a milling machine, which belongs to the technical field of fixtures.

Background technique

   The cross shaft is a machine that realizes variable-angle power transmission. It is used for the position where the direction of the transmission axis needs to be changed. Although the cross shaft part is small, its design requirements are strict. There are more than a dozen processes, and each process affects the processing of the part. Therefore, higher requirements are placed on the fixtures used in each process. Among them, the process of milling the step surface has high requirements for machining dimensional accuracy, position accuracy, and shape accuracy. The existing jigs for machining step surfaces with cross shafts are generally large in size, heavy in weight and complex in structure, and cannot guarantee the machining accuracy well.

Contents of the invention

The purpose of this new use model is to provide a cross-axis step surface processing fixture specially used for milling machines, so as to overcome the defects of large volume, heavy weight, complex structure and low machining accuracy of the existing clamps.

The technical solution of the utility model is: a cross-axis step surface processing fixture, including a clamp body, a positioning device and a clamping device; Cylindrical bosses are symmetrically distributed on both sides, and a through hole II is opened in the cylindrical boss; the bottom of the legs on both sides of the clamp body is a flat bottom structure that is convex, and the platform of the clamp body and the bottom of the legs are symmetrical to the center line of the through hole I. There are V-shaped block grooves and U-shaped grooves; the positioning device is composed of V-shaped blocks and mandrels, and the V-shaped blocks 3 are symmetrically distributed in the V-shaped block grooves; One end can be installed in the through hole Ⅰ on the platform of the clamp body; the clamping device is composed of a hook-shaped pressing plate, bolts and nuts, the hook-shaped pressing plate can be placed in the through-hole Ⅱ of the cylindrical boss, and a through-hole is provided in the hook-shaped pressing plate Ⅲ, the bolt passes through the through hole of the hook-shaped pressure plate Ⅲ and the nut is used together to clamp the workpiece.

The aspect ratio of the clamp body is 1:1, so as to make the clamp structure compact and ensure the stability of the clamp installed on the machine tool.

The end of the mandrel with a small diameter is provided with a collar, and the lower surface of the collar is in contact with the surface of the platform of the clamping body to play an axial positioning role.

The end of the mandrel with a large diameter is fitted with the cross shaft through a gap made of a base hole, and the mandrel limits the four degrees of freedom of the workpiece.

The included angle between the working faces of the V-shaped blocks is 90°, and the two V-shaped blocks limit the four degrees of freedom of the workpiece.

The through hole II in the cylindrical boss is a stepped hole, and the through hole III in the hook-shaped pressing plate is a stepped hole.

The lower end of the hook-shaped pressing plate is in clearance fit with the through hole II of the cylindrical boss, and the hook-shaped pressing plate can rotate.

The beneficial effects of the utility model are:

(1) The 90-degree V-shaped block is used for positioning, so that the positioning reference axis of the workpiece can be centered on the symmetrical surface of the two slopes of the V-shaped block, and it is not affected by the diameter error of the positioning surface. It has good centering and is easy to install. . It can be centered automatically, which is convenient for alignment during processing.

(2) The stepped hole design of the cylindrical boss 1.1 and the hook-shaped pressure plate 2 not only reduces the weight, but also enhances the rigidity of the parts, and also improves the alignment of the two bolts.

(3) The structure is simple, the operation is convenient, and the machining accuracy is easy to guarantee. It is economical and practical, and is suitable for medium-batch production of workpieces.

Description of drawings

Fig. 1 is the schematic diagram of the cross axis after processing;

Fig. 2 is a schematic cross-sectional view of the utility model;

Fig. 3 is the exploded schematic view of the utility model;

The labels in the figure are: 1-clamp body, 1.1-cylindrical boss, 1.1.1-through hole Ⅱ, 1.2-V-shaped block groove, 1.3-through hole Ⅰ, 1.4-U-shaped groove, 2-hook-shaped pressure plate, 2.1-through hole III, 3-V-shaped block, 4-mandrel, 4.1-collar, 5-cross shaft, 5.1-step surface of cross shaft, 6-bolt, 7-nut.

Detailed ways

Below in conjunction with accompanying drawing and embodiment, the utility model will be further described, but the content of the utility model is not limited to said range.

Embodiment: As shown in Figures 2 and 3, the cross-axis step surface processing fixture includes a clamp body 1, a positioning device and a clamping device, and is characterized in that: the clamp body 1 is a platform-type support structure, and the center position of the platform is set There is a through hole I1.3, and cylindrical bosses 1.1 are symmetrically distributed on both sides of the through hole I1.3, and a through hole II1.1.1 is opened in the cylindrical boss 1.1; the bottom of the legs on both sides of the clamp body 1 is a flat bottom structure that is convex outwards, A V-shaped block groove 1.2 and a U-shaped groove 1.4 are respectively symmetrically opened at the position of the platform of the clamp body 1 and the bottom of the leg and the center line of the through hole I1.3; the positioning device is composed of a V-shaped block 3 and a mandrel 4, and the V-shaped block 3 Symmetrically distributed in the V-shaped block groove 1.2; the mandrel 4 is a stepped structure with two sections of different diameters, and the end with a smaller diameter can be installed in the through hole I1.3 on the platform of the clamp body 1; the clamping device consists of a hook-shaped pressing plate 2 is composed of bolt 6 and nut 7. The hook-shaped pressure plate 2 can be placed in the through hole II1.1.1 of the cylindrical boss 1.1. The hook-shaped pressure plate 2 is provided with a through hole III2.1, and the bolt 6 passes through the through hole of the hook-shaped pressure plate. Hole Ⅲ2.1 is used in conjunction with nut 7 to clamp the workpiece.

The aspect ratio of clamp body 1 is 1:1; the end of the mandrel 4 with a small diameter is provided with a collar 4.1, and the lower surface of the collar 4.1 is in contact with the platform surface of the clamp body 1; the end with a large diameter of the mandrel 4 is in contact with the cross shaft 5 The clearance fit of the base hole system is adopted, the mandrel 4 limits the four degrees of freedom of the workpiece; the angle between the working surfaces of the V-shaped block 3 is 90°, and the two V-shaped blocks 3 limit the four degrees of freedom of the workpiece; the cylindrical convex The through hole II1.1.1 in the platform 1.1 is a stepped hole, and the through hole III2.1 in the hook-shaped pressing plate 2 is a stepped hole; the lower end of the hook-shaped pressing plate 2 and the through-hole II1.1.1 of the cylindrical boss 1.1 adopt a clearance fit, and the hook-shaped Pressing plate 2 can rotate.

When in use, first fix the clamp body 1 on the milling machine table through the U-shaped groove 1.4, then put the end of the mandrel 4 with a small diameter in the through hole I1.3, and the lower surface of the collar 4.1 contacts the platform of the clamp body. To achieve the axial positioning function, then install the two V-shaped blocks 3 symmetrically in the V-shaped block groove 1.2; then install the cross shaft 5 to be processed, the cross shaft 5 and the mandrel 4 adopt the clearance fit of the base hole, and the V-shaped block 3 and mandrel 4 limit the 6 degrees of freedom of the cross axis, then install the hook-shaped pressure plate 2 in the through hole II1.1.1 of the cylindrical boss 1.1, and finally install the bolts in the through-hole III2.1 of the hook-shaped pressure plate In the middle, tighten the nut to process the cross shaft.

Claims (7)

1. A jig for processing a cross-axis step surface, including a clamp body (1), a positioning device and a clamping device, characterized in that: the clamp body (1) is a platform-type support structure, and a through hole I is provided at the center of the platform (1.3), cylindrical bosses (1.1) are symmetrically distributed on both sides of the through hole I (1.3), and through holes II (1.1.1) are opened in the cylindrical bosses (1.1); the bottom of the legs on both sides of the clamp body (1) It is an outwardly convex flat bottom structure, and there are V-shaped block grooves (1.2) and U-shaped grooves (1.4) symmetrically formed at the positions of the platform of the clamp body (1) and the bottom of the legs and the center line of the through hole I (1.3); the positioning device consists of Composed of a V-shaped block (3) and a mandrel (4), the V-shaped block (3) is symmetrically distributed in the V-shaped block groove (1.2); the mandrel (4) is a stepped structure with two sections of different diameters, and the smaller diameter One end can be installed in the through hole I (1.3) on the platform of the clamp body (1); the clamping device is composed of a hook-shaped pressing plate (2), bolts (6), and nuts (7). The hook-shaped pressing plate (2) can be placed In the through hole II (1.1.1) of the cylindrical boss (1.1), a through hole III (2.1) is provided in the hook clamp (2), and the bolt (6) passes through the through hole III (2.1) of the hook clamp It is used in conjunction with the nut (7) to clamp the workpiece. 2. The cross-axis step surface processing jig according to claim 1, characterized in that: the height-to-width ratio of the jig body (1) is 1:1. 3. The jig for processing the cross shaft step surface according to claim 1, characterized in that: the end of the mandrel (4) with a small diameter is provided with a collar (4.1), and the lower surface of the collar (4.1) is in contact with the clamp body (1 ) platform surface contact. 4. The jig for processing the stepped surface of the cross shaft according to claim 1, characterized in that: the end of the mandrel (4) with a large diameter and the cross shaft (5) adopt a clearance fit made of a base hole, and the mandrel (4) restricts the workpiece four degrees of freedom. 5. The cross-axis step surface processing fixture according to claim 1, characterized in that: the angle between the working surfaces of the V-shaped blocks (3) is 90°, and the two V-shaped blocks (3) limit the four freedoms of the workpiece Spend. 6. The cross-axis step surface processing fixture according to claim 1, characterized in that: the through hole II (1.1.1) in the cylindrical boss (1.1) is a stepped hole, and the through hole in the hook-shaped pressure plate (2) Ⅲ(2.1) is a stepped hole. 7. The cross-axis step surface processing fixture according to claim 1, characterized in that: the lower end of the hook-shaped pressing plate (2) and the through hole II (1.1.1) of the cylindrical boss (1.1) adopt clearance fit, and the hook-shaped pressing plate (2) It can be rotated.

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