CN221640201U - Aluminum alloy shell part positioning fixture - Google Patents

Abstract

The utility model relates to an aluminum alloy shell part positioning fixture which comprises a base, a positioning pin, a sleeve, a hole positioning pin and a baffle plate. The base is cylindrical, two circular steps are formed in the upper part of the cylinder wall, the inner diameter of the lower step is slightly larger than the outer diameter of the circular baffle, the inner diameter of the upper step is slightly larger than the outer diameter of an aluminum alloy shell part to be processed, a step is formed by inwards shrinking a part, which is higher than a second step in the cylinder, in the axial direction of the cylinder wall, a certain distance away from the second step in the cylinder wall, an external thread is formed upwards from the beginning of the step, a positioning pin hole for a positioning pin is formed between the second step in the cylinder and the same external step, and a pin hole for a hole positioning pin is formed in the cylinder wall on the other side corresponding to the positioning pin hole; the sleeve is cylindrical, the upper part is an opening, the opening is provided with an inward flange, and the lower part is provided with an inner thread matched with the outer thread on the upper part of the base at the edge of the bottom. The utility model ensures that the clamping of the thin-shell aluminum part is more stable, effectively reduces the clamping deformation and the processing deformation of the part and avoids the processing chatter marks.

Description

Aluminum alloy shell parts positioning fixture

Technical Field

The invention relates to an aluminum shell part positioning fixture, which can be used for multi-step drilling and milling of thin-walled aluminum alloy shell parts and belongs to the field of mechanical manufacturing.

Background Art

In the process of mechanical processing, it is often encountered that the inner cavity of thin-walled aluminum alloy parts needs to be milled over a large area. Before milling, these aluminum alloy parts need to be clamped and fixed. In the prior art, there is no mature technology for clamping and fixing these aluminum alloy parts. According to the traditional clamping method of steel, if the aluminum shell parts with thin walls and large inner cavities that need to be milled are clamped too tightly or clamped multiple times, it will cause indentations or even deformation on the outer shell of the parts, resulting in the scrapping of the parts; if the clamping is too loose, chatter marks or even local dimensional deviations are easily generated during the milling of the inner cavity of the parts, which also causes the parts to be scrapped due to size or appearance problems. Therefore, it is very necessary and urgent to design and manufacture a reliable and effective aluminum alloy shell parts positioning fixture, which makes the clamping of aluminum parts more stable, can effectively reduce the deformation of parts during clamping and processing, avoid processing chatter marks, and meet the strict tolerance requirements of the product.

Summary of the invention

The purpose of the present invention is to provide a new type of clamp, which is used to clamp a special aluminum shell part. The aluminum shell part is numbered 4 in the attached figure of the specification, is roughly cylindrical, needs to be milled in the inner cavity, has a thin shell wall, and has multiple tapered holes along the circumferential direction at both ends of the shell wall. For such a part, in order to perform internal milling, the utility model proposes the following new type of clamp, which combines two step clamps into one, and has the characteristics of simple and fast operation while meeting the product processing accuracy requirements.

The objective of the present invention is achieved through the following technical solutions:

A positioning fixture for aluminum alloy shell parts, comprising a base 1, a positioning pin 2, a sleeve 3, a hole positioning pin 5 and a baffle 6. The base is cylindrical, with two circular steps formed inside the upper part of the cylinder wall, the inner diameter of the lower step is slightly larger than the outer diameter of the circular baffle 6, and the inner diameter of the upper step is slightly larger than the outer diameter of the aluminum alloy shell part to be processed, the outer part of the cylinder wall is shrunk inwards to form a step at a certain distance higher than the upper step in the cylinder in the cylinder axis direction, and there is an external thread from the beginning of the step upwards, a positioning pin hole for the positioning pin 2 is provided between the lower step in the cylinder and the same outer step, and a pin hole for the hole positioning pin 5 is provided on the cylinder wall on the other side corresponding to the positioning pin hole; the sleeve 3 is cylindrical, with an opening at the upper part, the opening has an inward flange, the width of the flange does not exceed the wall thickness of the part 4 to be processed, and the lower part to the bottom edge has an internal thread matching the external thread on the upper part of the base.

Furthermore, the width of the inner flange of the upper opening of the sleeve 3 is one third to one half of the wall thickness of the processed part 4 .

The specific application method of the utility model is as follows:

By clamping and positioning the cylindrical area of the base with three jaws, the inner cavity and side wall of the part are milled by embedded angular positioning. First, use three jaws to grasp the cylindrical area of the base 1, and use a dial indicator to adjust the base 1 to the horizontal direction; put the baffle 6 into the base 1 in advance. When the part 4 and the base 1 are too tightly adhered to the cutting fluid and are difficult to remove, the baffle 6 can be hooked through the center hole of the part 4 through the hook to take it out; put the part 4 into the base 1, and determine the center of the circle through the small gap between the outer circle of the part 4 and the inner hole of the base 1; insert the positioning pin 2 through the base 1 into the part groove to determine the angle; insert the positioning pin 5 of the other side hole through the base 1 into the part hole to determine the placement height of the part 4; finally, use the sleeve 3 to tighten and fix it through the thread. While the sleeve 3 is screwed into the thread to fix it, the flange of the sleeve 3 facing inward presses on the top of the side wall of the part 4.

In order to avoid indentation and deformation caused by clamping of part 4, the utility model adopts an embedded method for part 4, increases the fitting area between the fixture and part 4, compresses the outer circle tolerance of part 4, relies on the small clearance between the inner circle of the fixture and the outer circle of part 4 to determine the center of the circle, determines the height with the single-side hole positioning pin 5 and the total height of part 4, and determines the angle with the other side positioning pin 2. Finally, a sleeve is tightened through a nut to ensure that part 4 is evenly stressed and tightened to avoid loosening and chattering during the processing. When the milling of the inner cavity of one side of part 4 is completed, the sleeve 3 is unscrewed and the part 4 is reversed and placed in the base 1, and the above steps are repeated. Part 4 can be taken in and put in conveniently and quickly. For part 4 whose inner cavity and side walls need to be milled on both the front and back sides, the two processes of front milling and back milling can be combined. There is no need to check the tooling for repeated confirmation. It is only necessary to take out part 4 and place it on the back side, and tighten the sleeve 3.

Beneficial effects: The utility model makes the clamping of aluminum parts more stable, effectively reduces the deformation of parts clamping and processing, avoids processing chatter marks, and meets strict tolerance requirements. The embedded clamping of the utility model is used for special aluminum product parts, which not only meets the requirements of part size, but also meets the requirements of part appearance. It can not only perform two processes in the same equipment, but also improve the utilization rate of the fixture, improve the efficiency of operating tooling and clamping parts, and make part processing efficient and convenient. The utility model can be widely used in automobile, military, aviation, aerospace, shipbuilding and other mechanical manufacturing industries.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of an installation of a positioning fixture for an aluminum alloy housing part of the present invention, wherein 1 is a base, 2 is a positioning pin, 3 is a sleeve, 4 is a part, 5 is a hole positioning pin, and 6 is a baffle;

Figure 2 is a schematic diagram of the processed parts.

Example

The present invention is further described in detail by way of examples. It is worth noting that the examples are only used to explain the present invention and do not constitute any limitation to the present invention.

Referring to the attached drawings of the specification, the aluminum alloy shell part positioning fixture of the utility model comprises a base 1, a positioning pin 2, a sleeve 3, a hole positioning pin 5 and a baffle 6. Among them, the base is cylindrical, and two circular steps are formed inside the upper part of the cylinder wall. The inner diameter of the lower step is slightly larger than the outer diameter of the circular baffle 6, and the inner diameter of the upper step is slightly larger than the outer diameter of the aluminum alloy shell part to be processed. The outer cylinder wall of the cylinder shrinks inwards to form a step at a certain distance higher than the second step in the cylinder in the cylinder in the cylinder axis direction, and there is an external thread from the beginning of the step. There is a positioning pin hole for the positioning pin 2 between the second step in the cylinder and the same outer step, and there is a pin hole for the hole positioning pin 5 on the other side of the cylinder wall corresponding to the positioning pin hole; the sleeve 3 is cylindrical, the upper part is open, and the opening has an inward flange. The width of the inner flange of the upper opening of the sleeve 3 is one-third to one-half of the wall thickness of the processed part 4, and the lower part to the bottom edge has an internal thread matching the external thread of the upper part of the base.

The operation method of the utility model is as follows: by clamping and positioning the cylindrical area of the base with three claws, the inner cavity and side wall of the part are milled by the embedded angular positioning method. First, use three claws to grasp the cylindrical area of the base 1, and use a dial indicator to adjust the base 1 to the horizontal direction; put the baffle 6 into the base 1 in advance. If the part 4 and the base 1 are too tightly adhered to the cutting fluid and are difficult to remove, you can use a hook to hook the baffle 6 through the center hole of the part 4 to take it out; put the part 4 into the base 1, and use the smaller gap between the outer circle of the part 4 and the inner hole of the base 1 to match the center of the circle; insert the positioning pin 2 through the base 1 into the part groove to determine the angle; insert the positioning pin 5 of the other side hole through the base 1 into the part hole to determine the placement height of the part 4; finally, use the sleeve 3 to tighten and fix it through the thread. While the sleeve 3 is screwed into the thread to fix it, the flange of the sleeve 3 facing inward presses on the top of the side wall of the part 4. The so-called "up" and "down" in the text do not represent the spatial orientation of the components during actual operation, but are only for the convenience of description. When looking at the drawings in the specification, especially Figure 1, it is assumed that the end of the base without the external thread is sitting on the ground plane.

The utility model is described in detail above through embodiments. It is worth noting that this embodiment is only a preferred embodiment of the utility model, not all embodiments of the utility model, and does not constitute a limitation on the protection scope of the utility model. The protection scope of the utility model is determined by the claims in the application documents. Without departing from the spirit and essence of the utility model, other embodiments obtained by ordinary technicians in this field without creative work and only by equivalent substitution of the technical features in the utility model, etc., all fall within the protection scope of the utility model.

Claims (2)

1. An aluminum alloy housing part positioning fixture, characterized in that the positioning fixture comprises: the device comprises a base (1), a locating pin (2), a sleeve (3), a hole locating pin (5) and a circular baffle plate (6); the base (1) is cylindrical, two circular steps are formed in the middle part of the cylinder wall and slightly larger than the outer diameter of the circular baffle (6), the inner diameter of the step at the lower part is slightly larger than the outer diameter of an aluminum alloy shell part to be processed, the part, which is higher than the step at the upper part in the cylinder, of the cylinder wall at the outer part in the axial direction is contracted inwards to form a step, external threads are formed upwards from the beginning of the step, a positioning pin hole for the positioning pin (2) is formed between the step at the upper part in the cylinder and the step at the same outer part, and a pin hole for a hole positioning pin (5) is formed in the cylinder wall at the other side corresponding to the positioning pin hole; the sleeve (3) is cylindrical, the upper part is provided with an opening, the opening is provided with an inward flange, the width of the flange is not more than the wall thickness of the priced part (4), and the lower part of the sleeve (3) is provided with an inner thread matched with the outer thread at the upper part of the base at the bottom edge.

2. An aluminum alloy housing part positioning fixture as recited in claim 1, wherein: the width of the inner flange of the upper opening of the sleeve (3) is one third to one half of the wall thickness of the processed part (4).