CN202079414U - Positioning jig for processing thin large-aperture disc type part - Google Patents

Abstract

The utility model discloses a positioning jig for processing a thin large-aperture disc type part, which is capable of guaranteeing firm and reliable aperture positioning and axial positioning. The positioning jig comprises a base plate, a mandrel, an inner expansion sleeve, a pressing plate, a plurality of supporting seats and a plurality of hold-down mechanisms, wherein the lower end of the mandrel is fixed on the base plate, and the lower part of the mandrel is a cone; the inner circumferential surface of the inner expansion sleeve is a circular conical surface which is matched with the upper part of the mandrel; the pressing plate is a disc of which the outer diameter is matched with the outer diameter of the inner expansion sleeve; a through hole is formed in the centre of the end face of the pressing plate; the inner expansion sleeve is inserted into a macro-pore of a work piece and sleeved on the upper part of the mandrel; the pressing plate is covered on the upper end face of the inner expansion sleeve, and connected with the mandrel by a screw which is penetrated in the through hole of the pressing plate; the inner expansion sleeve can move upwards or downwards and the outer diameter of the inner expansion sleeve can be changed by rotating the screw; the plurality of supporting seats are uniformly arranged on the base plate around the mandrel; the plurality of hold-down mechanisms and the supporting seats are uniformly arranged on the base plate around the mandrel correspondingly, and located on the periphery of the supporting seats.

Description

A positioning tool for processing thin-shaped large-aperture disk parts

technical field

The utility model relates to a jig tool for a mechanical manufacturing process, in particular to a positioning tool for processing thin-shaped large-aperture disk parts. the

Background technique

In the machinery manufacturing industry, in the process of drilling a circle of small holes 12 on the peripheral end face of its large hole 11 for thin-shaped large-aperture disc parts 1 (see Figure 1), the large hole 11 and one end face thereof are often Hole side positioning. The traditional large hole positioning method generally uses a mandrel with a set outer diameter to cooperate with the large hole of the workpiece for positioning; another aperture positioning method uses an internally expanding mandrel and the large hole of the workpiece for positioning without clearance. the

The former positioning method often has poor accuracy, and it is inconvenient to clamp the workpiece. The low efficiency of the process leads to damage to the large aperture of the workpiece, and the potential risk of positioning failure is relatively high. the

The latter adopts the internal expansion mandrel to cooperate with the large hole of the workpiece for positioning. Since the depth and diameter of the large hole of the workpiece are relatively small, which is 1:18, although the mandrel and the large hole of the workpiece are matched without clearance, the accuracy is relatively high. The clamping of the workpiece is more convenient, but because the ratio of the depth of the large hole of the workpiece to the diameter of the large hole is relatively small, the axial length of the effective cooperation between the mandrel and the large hole of the workpiece is relatively short, and the workpiece is easy to move after being subjected to the cutting force during processing. There is also a risk of positioning failure. the

Contents of the invention

The purpose of this utility model is to overcome the deficiencies of the prior art and provide a positioning tool for processing thin-shaped large-aperture disk parts, which can ensure firm and reliable aperture positioning and axial positioning, ensure workpiece positioning accuracy and facilitate clamping , thereby improving process efficiency. the

The technical solution to achieve the above purpose is: a positioning tool for processing thin-shaped large-aperture disk parts, including a base plate, a mandrel, an inner expansion sleeve, a pressure plate, several supporting seats and several pressing mechanisms, wherein,

The lower end of the mandrel is fixed on the base plate, the lower part of the mandrel is a cylinder, the lower part is a cone that gradually becomes smaller from bottom to top, and a threaded hole is opened in the center of the upper end surface of the mandrel;

The outer peripheral surface of the inner expansion sleeve is a cylinder, and the inner peripheral surface is a conical surface adapted to the upper part of the mandrel;

The pressure plate is a disc body whose outer diameter is adapted to the outer diameter of the inner expansion sleeve, and a perforation coaxial with the threaded hole on the mandrel is opened in the center of its end face;

The inner expansion sleeve is inserted into the large hole of the thin-shaped large-aperture disk part and is set on the upper part of the mandrel. The pressure plate covers the upper end surface of the inner expansion sleeve. The pressure plate passes through a The screw inserted in the perforation of the pressure plate is screwed into the threaded hole of the mandrel and connected with the mandrel, rotating the screw can move the inner expansion sleeve up and down and change the outer diameter of the inner expansion sleeve;

The plurality of support seats are evenly distributed on the substrate around the mandrel;

The plurality of pressing mechanisms are uniformly distributed on the base plate around the mandrel and located on the periphery of the support seat corresponding to the support seat. the

The above-mentioned positioning tool for processing thin-shaped large-aperture disk parts, wherein, there are three supporting seats and three pressing mechanisms. the

The above-mentioned positioning tool for processing thin large-aperture disk parts, wherein each of the pressing mechanisms includes a cylinder, a connecting rod and a pressing plate, the cylinder is fixed on the base plate, and the connecting rod One end of the pressing plate is movably connected to the end face of the cylinder, the rear end of the pressing plate is movably connected to the free end of the piston rod of the cylinder, and the middle part of the pressing plate is movably connected to the other end of the connecting rod. the

The technical scheme of the positioning tool for processing thin large-aperture disk parts of the utility model adopts a high-strength inner expanding mandrel to cooperate with the large hole of the workpiece for the positioning of the inner hole, and adds three axial cylinder pressing devices to ensure The large aperture and axial positioning of the workpiece are firm and reliable, ensuring the positioning accuracy of the workpiece and facilitating clamping, thereby improving the efficiency of the drilling process on the peripheral end surface of the large hole. the

Description of drawings

Figure 1 is a sectional view of the processed thin large-aperture disk parts;

Fig. 2 is a structural schematic diagram of a positioning tool for processing thin-shaped large-aperture disk parts of the present invention. the

Detailed ways

In order to better understand the technical solution of the present utility model, the following will be described in detail through specific embodiments in conjunction with the accompanying drawings:

Please refer to Fig. 2, the positioning tool for processing thin-shaped large-aperture disk parts of the present utility model includes a base plate 2, a mandrel 3, an inner expansion sleeve 4, a pressure plate 5, a screw 6, three support seats 7 and Three groups of pressing mechanism 8, wherein,

The lower end of the mandrel 3 is fixed on the base plate 2, the lower part of the mandrel 3 is a cylinder, and the upper part is a cone that gradually becomes smaller from bottom to top, and a threaded hole is opened in the center of the upper end surface of the mandrel 3;

The outer peripheral surface of the inner expansion sleeve 4 is a cylinder, and the inner peripheral surface is a conical surface adapted to the upper part of the mandrel 3;

The pressure plate 5 is a disc body whose outer diameter is adapted to the outer diameter of the inner expansion sleeve 4, and a perforation coaxial with the threaded hole on the mandrel 3 is provided in the center of its end face;

Screw 6 is inserted in the perforation of pressing plate 5;

Three supporting bases 7 are uniformly fixed on the substrate 2 around the mandrel 3;

Three groups of pressing mechanisms 8 are uniformly installed on the substrate 2 around the mandrel 3 and are positioned at the periphery of the supporting base 7 correspondingly to the supporting base 7; each group of pressing mechanisms 8 includes a cylinder 81, a connecting rod 82 and a pressing Tightening plate 83, cylinder 81 is fixed on the base plate 2, and one end of connecting rod 82 is movably connected on the end face of cylinder 81, and the rear end of pressing plate 83 is movably connected to the free end of the piston rod of cylinder 81, and the free end of pressing plate 83 The middle part is movably connected to the other end of the connecting rod 82 . the

When the positioning tool of the utility model is in use, the inner expansion sleeve 4 is inserted in the large hole 11 of the thin-shaped large-aperture disc part 1 and fitted on the upper part of the mandrel 3, and the pressure plate 5 covers the upper end surface of the inner expansion sleeve 4. The pressing plate 5 is connected with the spindle 3 by being screwed in the threaded hole of the spindle 3 by a screw 6 , and the screw 6 can make the inner expansion sleeve 4 move up and down and change the outer diameter of the inner expansion sleeve 4 . The screw 6 is in the loosened state, that is, the outer diameter of the inner expansion sleeve 4 is smaller than the inner diameter of the reference large hole 11 of the workpiece 1. After cleaning the joint surface of the workpiece 1 and the tooling, put the workpiece 1 into the tooling, and then tighten the screw 6 to make the inner expansion There is no gap between the expansion of the outer diameter of the cover 4 and the expansion of the large datum hole 11 of the workpiece 1, and the centering of the workpiece 1 has been completed at this time. In order to prevent the workpiece 1 from moving axially under the action of the cutting force, several sets of supporting seats 7 and pressing mechanisms 8 are added on the two ends of the workpiece 1 near the large hole, and the three supporting seats 7 are respectively supported on the lower end surface of the workpiece 1; The pressing plate 83 of the tightening mechanism 8 is pressed against the upper end surface of the workpiece 1 to fix the workpiece 1 axially. When the pressing plate 83 of the pressing mechanism 8 is in the pressing state, the processing of the small hole 12 of the workpiece 1 can be carried out. the

The clamping method of the positioning tool of the utility model is reliable and convenient, and the axial positioning stability of the workpiece 1 is enhanced, thereby ensuring the positioning accuracy and firm axial positioning of the large hole of the workpiece, and improving the efficiency of the processing process. the

Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the utility model, rather than as a limitation to the utility model, as long as within the spirit of the utility model, the above-mentioned The changes and modifications of the embodiments will all fall within the scope of the claims of the present utility model. the

Claims (3)

1. A positioning tool for processing thin-shaped large-aperture disc-like parts, comprising a base plate, a mandrel, an inner expansion sleeve, a pressing plate, some support seats and some pressing mechanisms, characterized in that, The lower end of the mandrel is fixed on the base plate, the lower part of the mandrel is a cylinder, the lower part is a cone that gradually becomes smaller from bottom to top, and a threaded hole is opened in the center of the upper end surface of the mandrel; The outer peripheral surface of the inner expansion sleeve is a cylinder, and the inner peripheral surface is a conical surface adapted to the upper part of the mandrel; The pressure plate is a disc body whose outer diameter is adapted to the outer diameter of the inner expansion sleeve, and a perforation coaxial with the threaded hole on the mandrel is opened in the center of its end face; The inner expansion sleeve is inserted into the large hole of the thin-shaped large-aperture disk part and is set on the upper part of the mandrel. The pressure plate covers the upper end surface of the inner expansion sleeve. The pressure plate passes through a The screw inserted in the perforation of the pressure plate is screwed into the threaded hole of the mandrel and connected with the mandrel, and rotating the screw can move the inner expansion sleeve up and down and change the outer diameter of the inner expansion sleeve; The plurality of support bases are evenly distributed on the substrate around the mandrel; The plurality of pressing mechanisms are uniformly distributed on the base plate around the mandrel and located on the periphery of the support seat corresponding to the support seat. 2. The positioning tool for processing thin and large-diameter disc parts according to claim 1, wherein there are three support seats and three pressing mechanisms respectively. 3. The positioning tool for processing thin-shaped large-aperture disk parts according to claim 1, wherein each said pressing mechanism comprises a cylinder, a connecting rod and a pressing plate, and said cylinder is fixed on On the base plate, one end of the connecting rod is movably connected to the end face of the cylinder, the rear end of the pressing plate is movably connected to the free end of the piston rod of the cylinder, and the middle part of the pressing plate is movably connected to the other end of the connecting rod. one end. the

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