CN220761286U - Structure of electrode connection part for electric spark machining enclosed integral impeller - Google Patents

Abstract

The utility model discloses a closed integral impeller group electrode connection structure for electrospark machining, including: a connecting fixture body; a positioning plate, the positioning plate is fixedly connected to the bottom of the connecting fixture body, a V-shaped surface is arranged on one side of the positioning plate, and the two inclined surfaces of the V-shaped surface are symmetrically arranged about the YOZ plane of the spatial rectangular coordinate system with the center position of the bottom surface of the positioning plate as the coordinate center O, the width direction as the X axis, the length direction as the Y axis, and the height direction as the Z axis; a fixing mechanism, the fixing mechanism includes a first fixing member and a second fixing member, the first fixing member is arranged on the top of the connecting fixture body, the second fixing member is arranged on the side of the connecting fixture body, and the connecting fixture body is fixedly connected to the machining electrode through the first fixing member and the second fixing member. The present invention has accurate positioning, and the connection between the machining electrode and the positioning device is stable, which solves the problem that the traditional electrode falls off in the middle of the machining process due to the electrode lifting action and the discharge blasting force during the machining process.

Description

Electrode connection structure of closed integral impeller group machined by EDM

Technical Field

The utility model relates to the technical field of aviation and aerospace engine manufacturing, in particular to an electrode connection part structure of a closed integral impeller group machined by electric spark machining.

Background technique

The impeller is one of the key components of aviation and aerospace engines. Its blades are large torsional free-form surfaces, and high-precision parts processing is required. In addition, the working conditions are high temperature, high pressure, and high-speed rotation environments, which also put higher requirements on the materials of the parts. They are often made of difficult-to-process materials such as high-temperature alloys.

Traditional machining methods have many difficult-to-overcome problems such as low machining accuracy, severe tool wear, and high cost. However, EDM is a non-contact machining method that eliminates machining errors caused by contact stress and machining chatter, and is widely used in the field of high-precision machining. Secondly, EDM can process any conductive material and is not limited by the hardness of the material, so it is widely used in the fields of aviation and aerospace. However, EDM has problems such as low machining efficiency. In order to improve machining efficiency, group electrode machining is adopted. How to construct the connection part of the EDM impeller group electrode should consider the following aspects.

First, when EDM machining closed integral impellers, problems such as inconsistent blade thickness and uneven blade distribution often occur, which is far from meeting the part accuracy required in the aviation and aerospace manufacturing fields. The main reason for these problems is that the positioning accuracy of the electrode rough and fine machining cannot meet the requirements, so the positioning of the electrode on the fixture must be accurate.

Secondly, the imperfect connection between the electrode and the chuck will cause the electrode to loosen and fall off the fixture due to the tool lifting movement and discharge explosion force. If an electrode falls off, the entire workpiece will be scrapped, seriously reducing production efficiency and increasing production costs. Traditional electrode connection components cannot meet the needs of EDM for fastening connections. Therefore, when designing the connection part of the electrode, the fastening function of the electrode should be given special consideration.

In view of the above-mentioned problems, in order to ensure the positioning accuracy and connection strength requirements between the electrode and the fixture, the utility model provides a novel EDM closed integral impeller group electrode connection component, which improves the processing efficiency and saves the production cost.

Utility Model Content

The utility model aims to provide an electrode connection structure of a closed integral impeller group machined by electric spark machining to solve the problems existing in the prior art.

To achieve the above-mentioned purpose, the utility model provides the following solution: The utility model provides an electrode connection structure of a closed integral impeller group machined by electric spark machining, comprising:

Connect the fixture body;

A positioning plate, the positioning plate is fixedly connected to the bottom of the connecting fixture body, a V-shaped surface is provided on one side of the positioning plate, and two inclined surfaces of the V-shaped surface are symmetrically arranged about the YOZ plane of a spatial rectangular coordinate system with the center position of the bottom surface of the positioning plate as the coordinate center O, the width direction as the X axis, the length direction as the Y axis, and the height direction as the Z axis;

A fixing mechanism, the fixing mechanism comprising a first fixing member and a second fixing member, the first fixing member being arranged on the top of the connecting fixture body, the second fixing member being arranged on the side of the connecting fixture body, the connecting fixture body being fixedly connected to the processing electrode through the first fixing member and the second fixing member;

Among them, the top surface of the positioning plate is a positioning surface, the V-shaped surface is adapted to the shape of the processing electrode, and the positioning surface and the V-shaped surface are used to limit the degrees of freedom of the processing electrode in six directions.

According to the EDM closed integral impeller group electrode connection part structure provided by the utility model, the first fixing part includes a stud fixedly connected to the top of the connecting fixture body, a nut is threadedly connected to the stud, and the machining electrode is fixedly connected to the top of the connecting fixture body through the stud and the nut.

According to the closed integral impeller group electrode connection structure for electrospark machining provided by the utility model, a serrated locking washer is arranged between the nut and the machining electrode.

According to the EDM closed integral impeller group electrode connection structure provided by the utility model, the second fixing part includes a positioning bolt, a threaded hole is opened on the machining electrode, the positioning bolt is threadedly connected in the threaded hole, and the positioning bolt abuts against the side of the connecting fixture body.

According to the EDM closed integral impeller group electrode connection structure provided by the utility model, the connection fixture body is a cube structure, and the side length of the connection fixture body is equal to the width of the positioning plate.

The utility model discloses the following technical effects:

The utility model uses a V-shaped surface on the positioning plate that is adapted to the shape of the processing electrode, and uses the top surface of the positioning plate as the positioning surface to limit the freedom of the processing electrode in six directions. The first fixing member and the second fixing member fix the electrode and limit it at the same time, thereby ensuring the stability of the processing electrode installation and the accuracy of positioning.

The present invention has accurate positioning and stable connection between the machining electrode and the positioning device, which solves the problem of the traditional electrode falling off during machining due to the electrode tool lifting action and discharge blasting force, greatly reduces the scrap rate of the workpiece and saves production costs.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic structural diagram of the electrode connection of a closed integral impeller group machined by electrospark machining according to the present invention.

Among them, 1. connecting the clamp body; 2. positioning plate; 3. stud; 4. V-shaped surface.

Detailed ways

The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

1 , the utility model provides an electrode connection structure of a closed integral impeller group for electrospark machining, comprising:

Connecting fixture body 1;

The positioning plate 2 is fixedly connected to the bottom of the connecting fixture body 1. A V-shaped surface 4 is provided on one side of the positioning plate 2, and the two inclined surfaces of the V-shaped surface 4 are symmetrically arranged about the YOZ plane of the spatial rectangular coordinate system with the center position of the bottom surface of the positioning plate 2 as the coordinate center O, the width direction as the X axis, the length direction as the Y axis, and the height direction as the Z axis; the design of the V-shaped surface 4 greatly increases the contact area between the parts, making the positioning more stable; the V-shaped composed of the double inclined surfaces has good centering, making it difficult for the electrode to deviate and easy to install;

The fixing mechanism includes a first fixing member and a second fixing member, wherein the first fixing member is arranged on the top of the connecting fixture body 1, and the second fixing member is arranged on the side of the connecting fixture body 1, and the connecting fixture body 1 is fixedly connected to the processing electrode through the first fixing member and the second fixing member;

Among them, the top surface of the positioning plate 2 is the positioning surface, the V-shaped surface 4 is adapted to the shape of the processing electrode, and the positioning surface and the V-shaped surface 4 are used to limit the freedom of the processing electrode in six directions.

The utility model limits the freedom of the machining electrode in six directions by using the V-shaped surface 4 on the positioning plate 2 which is adapted to the shape of the machining electrode, and limits the electrode while fixing it by the first fixing member and the second fixing member, thereby ensuring the stability of the machining electrode installation and the accuracy of positioning.

According to a further optimized solution, the first fixing member includes a stud 3 fixedly connected to the top of the connecting fixture body 1, a nut is threadedly connected to the stud 3, and the processing electrode is fixedly connected to the top of the connecting fixture body 1 through the stud 3 and the nut.

In a further optimized solution, a serrated locking washer is provided between the nut and the machining electrode. The nut, serrated locking washer, positioning bolt and machining electrode are not shown in the drawings of the specification.

In the past, spring washers were often used in engineering. After tightening, spring washers rely on their own reaction force to increase the axial tension between the connection pairs, thereby increasing the friction force to prevent loosening. However, spring washers have a short lifespan. Especially during electrospark machining, they are often affected by the electrode's tool lifting action and the discharge blasting force, making them more prone to loosening and deformation. Therefore, the original spring washers are improved to serrated locking washers with better locking effects. The serrated locking washers have multiple serrated protrusions evenly distributed along the circumference. Its protrusions will bite the surfaces of the fasteners and the connected parts, increasing the fastening friction resistance, which can largely meet the stability requirements of the device in the actual processing process.

According to a further optimized solution, the second fixing member includes a positioning bolt. A threaded hole is opened on the processing electrode. The positioning bolt is threadedly connected in the threaded hole, and the positioning bolt abuts against the side surface of the connecting fixture body 1.

According to a further optimization scheme, the connecting fixture body 1 is a cube structure, and the side length of the connecting fixture body 1 is equal to the width of the positioning plate 2 .

In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims (5)

1. The structure of the electrode connection part of the closed integral impeller group machined by electric spark machining is characterized by comprising: Connecting the fixture body (1); A positioning plate (2), the positioning plate (2) being fixedly connected to the bottom of the connecting fixture body (1), a V-shaped surface (4) being provided on one side of the positioning plate (2), and two inclined surfaces of the V-shaped surface (4) being symmetrically arranged about a YOZ plane of a spatial rectangular coordinate system with the center position of the bottom surface of the positioning plate (2) as the coordinate center O, the width direction as the X axis, the length direction as the Y axis, and the height direction as the Z axis; A fixing mechanism, the fixing mechanism comprising a first fixing member and a second fixing member, the first fixing member being arranged on the top of the connecting fixture body (1), the second fixing member being arranged on the side of the connecting fixture body (1), the connecting fixture body (1) being fixedly connected to the processing electrode via the first fixing member and the second fixing member; The top surface of the positioning plate (2) is a positioning surface, the V-shaped surface (4) is adapted to the shape of the processing electrode, and the positioning surface and the V-shaped surface (4) are used to limit the degrees of freedom of the processing electrode in six directions. 2. The electrode connection structure of a closed integral impeller group machined by electrospark machining according to claim 1 is characterized in that: the first fixing part includes a stud (3) fixedly connected to the top of the connecting fixture body (1), and a nut is threadedly connected to the stud (3), and the machining electrode is fixedly connected to the top of the connecting fixture body (1) through the stud (3) and the nut. 3. The closed integral impeller group electrode connection structure for electrospark machining according to claim 2, characterized in that a serrated locking washer is provided between the nut and the machining electrode. 4. The closed integral impeller group electrode connection structure for electrospark machining according to claim 1 is characterized in that: the second fixing part includes a positioning bolt, a threaded hole is opened on the machining electrode, the positioning bolt is threadedly connected in the threaded hole, and the positioning bolt abuts against the side of the connecting fixture body (1). 5. The electrode connection structure of the closed integral impeller group machined by electric spark machining according to claim 1 is characterized in that: the connecting fixture body (1) is a cube structure, and the side length of the connecting fixture body (1) is equal to the width of the positioning plate (2).