CN210877967U

CN210877967U - Special electrode for machining micro-duplicate gear mold cavity

Info

Publication number: CN210877967U
Application number: CN201921477595.4U
Authority: CN
Inventors: 李文明; 刘飞; 郝龙; 张五金; 赵涛
Original assignee: Zhonghuan Information College Tianjin University Of Technology
Current assignee: Zhonghuan Information College Tianjin University Of Technology
Priority date: 2019-09-05
Filing date: 2019-09-05
Publication date: 2020-06-30
Anticipated expiration: 2029-09-05

Abstract

The utility model relates to a tool for machining a cavity of a micro-duplicate gear mold, in particular to a special electrode for machining the cavity of the micro-duplicate gear mold, which comprises an electrode base, wherein the base is provided with a reference angle, and positioning holes, threaded holes and electrode holes on the base are designed and machined by taking the reference angle as a reference, so that the horizontal direction position of each electrode is ensured; the large gear, the small gear and the central shaft are three electrodes; rhombus locating pin, hexagonal jackscrew. The electrodes and the electrode holes are in micro clearance fit, positioning holes which are the same as the positioning holes of the corresponding base in the center line are formed in the electrodes in the direction perpendicular to the axis of the electrodes, the vertical position of each electrode is guaranteed through a diamond positioning pin, and then the electrodes are fixed through inner hexagonal jackscrews. Application the utility model discloses electrode spark-erosion forming's miniature chamber, the axiality is high between duplicate gear, the centre bore three, can process out the miniature chamber of the multiple gear that great depth-diameter ratio on the mould steel of high rigidity, the mould is longe-lived.

Description

Special electrode for machining micro-duplicate gear mold cavity

Technical Field

The utility model relates to an instrument of little duplicate gear mould die cavity processing usefulness specifically is a little duplicate gear mould die cavity processing special electrode.

Background

The micro device is a promising electromechanical product, the gear transmission can transmit motion and power according to a specified speed ratio, and the micro device is an essential part for realizing functions. The requirements of the micro-duplicate gear with compact structure, high dimensional precision and small size are continuously increased, metal powder injection molding, die-casting molding and plastic injection molding are main technical means for realizing the mass production of the micro-duplicate gear, and the preparation of the micro-duplicate gear mold cavity is the key for ensuring the mass production.

At present, the research on the micro-gear machining technology is mostly the process research of single-piece small-batch production, such as the processing of micron-sized precision micro-gears by using ultraviolet electroforming, laser machining and micro electric spark wire cutting technology. The process research of the micro-duplex gear machining is relatively few, and a learner adopts a lamination manufacturing method, firstly, a femtosecond laser is used for cutting micro-gears with different parameters on a metal foil, then, the micro-gears are welded by utilizing micro-resistance slip welding, and finally, a micro-duplex gear mold cavity is obtained; the micro-cavities prepared by this laminate manufacturing method have traces between the laminates, the micro-cavity accuracy is affected, and the micro-cavities are not as strong as the integrated micro-cavities obtained by removing the material. Preparing a corresponding male die electrode required by a micro-duplicate gear cavity according to an electric spark forming machining principle; if the male die electrode is processed by micro milling, the problems of insufficient cutter edge length or insufficient tooth profile processing precision, and particularly appearing on a pinion, exist; the laser and wire electric discharge machining technology has unique advantages in the field of micro machining, but is limited to machining of two-dimensional structures. In order to realize the mass production of the micro-duplicate gear, an economic and reliable tool for preparing the micro-duplicate gear cavity of the mold is urgently needed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a little duplex gear mould die cavity processing special electrode to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a quasi-three-dimensional structure electrode of an electric spark forming micro-duplicate gear is divided into three two-dimensional structure electrodes, a large gear electrode, a small gear electrode and a central shaft electrode. The locating hole, the threaded hole and the electrode hole in the base are designed and processed by a reference angle on the base, the inner side of the electrode hole in the electrode base on the left side is connected with a large gear electrode in a sliding mode, the inner side of the electrode hole in the electrode base on the middle side is connected with a small gear electrode in a sliding mode, and the inner side of the electrode hole in the electrode base on the right side is connected with a central shaft electrode in a sliding mode.

Preferably, the bull gear electrode, the pinion electrode and the central shaft electrode are provided with positioning holes which are the same as the positioning holes of the corresponding bases in the direction vertical to the axis of the electrodes; the positioning holes on the rear end face of the electrode base are respectively connected with a first diamond positioning pin, a second diamond positioning pin and a third diamond positioning pin in a sliding mode from left to right, and each diamond positioning pin is respectively matched with a large gear electrode positioning hole, a small gear electrode positioning hole and a central shaft electrode positioning hole through the corresponding base positioning hole; the electrode base is characterized in that a threaded hole in the front end face of the electrode base is respectively and spirally connected with a first inner hexagonal jackscrew, a second inner hexagonal jackscrew and a third inner hexagonal jackscrew from left to right, and each inner hexagonal jackscrew is respectively clamped with the large gear electrode, the small gear electrode and the central shaft electrode through the corresponding base threaded hole.

Preferably, the formed cavity of the micro-duplicate gear die comprises a fixed die insert and a movable die insert; the central hole in the fixed die insert and the central hole in the movable die insert are formed by dividing an integrated hole in a cavity of the formed micro-duplex gear die.

Compared with the prior art, the beneficial effects of the utility model are that:

in the utility model, the electrodes with quasi-three-dimensional structure are decomposed into a plurality of electrodes with two-dimensional structure, and the slow wire-cut electrospark wire-electrode cutting ensures the processing quality of each electrode with two-dimensional structure; when the electric spark is used for forming the micro duplicate gear cavity, the reference angle on the electrode base and the top surface of each electrode are used for positioning, so that the shape precision of the micro cavity and the position precision on the die steel are ensured. The core hole is formed at one time and then divided into two sections, so that the coaxiality of the core holes of the fixed die insert and the moving die insert is ensured. The micro-duplex gear mold cavity is formed on high-hardness mold steel in a material removing mode, and the mold is good in strength and long in service life.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the assembly structure of the pinion electrode, the diamond-shaped positioning pin, the inner hexagonal jackscrew and the base of the present invention; the large gear electrode and the central shaft electrode are respectively in the same way with the rhombic positioning pin, the inner hexagonal jackscrew and the base assembling structure;

FIG. 3 is a schematic view of the cavity structure of the micro-duplicate gear mold after the molding of the present invention;

fig. 4 is the utility model discloses cover half insert and movable mould insert structural schematic.

In the figure: 1-electrode base, 2-reference angle, 3-bull gear electrode, 4-pinion gear electrode, 5-central shaft electrode, 6-first diamond positioning pin, 7-second diamond positioning pin, 8-third diamond positioning pin, 9-first inner hexagonal jackscrew, 10-second inner hexagonal jackscrew, 11-third inner hexagonal jackscrew, 12-rear end face, 13-front end face, 14-top face, 15-formed rear micro duplex gear die cavity, 16-integral hole, 17-fixed die insert, 18-movable die insert, 19-central hole in the fixed die insert and 20-central hole in the movable die insert.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a technical solution:

the utility model provides a little duplex gear mould die cavity processing private electrode, includes electrode base 1, the base plane direction has seted up benchmark angle 2, the locating hole has been seted up to rear end face 12, preceding terminal surface 13 has seted up the screw hole, the electrode hole has been seted up to top surface 14, gear electrode 3, pinion electrode 4 and central spindle electrode 5 three electrode and locating hole separately, first rhombus locating pin 6, second rhombus locating pin 7 and third rhombus locating pin 8, first hexagon socket head cap screw 9, second hexagon socket head cap screw 10 and third hexagon socket head cap screw 11.

Dividing a quasi three-dimensional structure electrode of the electric spark forming micro duplex gear into three two-dimensional structure electrodes, namely a bull gear electrode 3, a pinion gear electrode 4 and a central shaft electrode 5; the positioning hole, the threaded hole and the electrode hole on the base are designed and processed according to the reference angle on the base, so that the processing precision is high, and the processing error caused by the misalignment of the references is reduced; the inner side of an electrode hole of the electrode base 1 positioned on the left side is connected with a large gear electrode 3 in a sliding manner, the inner side of an electrode hole of the electrode base 1 positioned in the middle is connected with a small gear electrode 4 in a sliding manner, the inner side of an electrode hole of the electrode base 1 positioned on the right side is connected with a central shaft electrode 5 in a sliding manner, the three electrodes and the corresponding electrode holes are designed into micro clearance fit, and the three electrodes are machined on a slow wire-moving wire-cut electric; positioning holes which are the same as the center lines of the corresponding base positioning holes are formed in the large gear electrode 3, the small gear electrode 4 and the central shaft electrode 5 in the direction vertical to the axis of the electrodes; the positioning holes on the rear end face 12 of the electrode base 1 are respectively connected with a first diamond positioning pin 6, a second diamond positioning pin 7 and a third diamond positioning pin 8 in a sliding mode from left to right, each diamond positioning pin is respectively matched with a large gear electrode 3 positioning hole, a small gear electrode 4 positioning hole and a central shaft electrode 5 positioning hole through corresponding base positioning holes, the large gear electrode 3, the small gear electrode 4 and the central shaft electrode 5 can be conveniently and respectively positioned and assembled, and the position accuracy of the device in the vertical direction is guaranteed; the threaded holes of the front end surface 13 of the electrode base 1 are respectively and spirally connected with a first inner hexagonal jackscrew 9, a second inner hexagonal jackscrew 10 and a third inner hexagonal jackscrew 11 from left to right, and each inner hexagonal jackscrew is respectively clamped with the large gear electrode 3, the small gear electrode 4 and the central shaft electrode 5 through the corresponding base threaded hole, so that the tightness of the device is ensured; the formed micro-duplex gear mold cavity 15 comprises a fixed mold insert 17 and a movable mold insert 18; the central hole 19 in the fixed die insert and the central hole 20 in the movable die insert are formed by dividing the integrated hole 16 in the cavity of the formed micro-duplex gear die, the coaxiality of the central holes of the two inserts is high, the strength of the die is good, and the service life of the die is long.

The working process is as follows: firstly, six surfaces of a blank of an electrode base 1 and a blank of a cavity 15 of a micro duplex gear die are precisely ground, the height of the ground blank of the cavity 15 of the micro duplex gear die is 2-3mm greater than the sum of the heights of a final fixed die insert 17 and a final moving die insert 18, and a high-speed machining center performs preprocessing on a micro cavity to reduce the subsequent electric spark forming machining amount.

Then, dividing electrodes of an electric spark forming micro-duplex gear into three structures, namely a large gear electrode 3, a small gear electrode 4 and a central shaft electrode 5, designing the three electrodes to be in micro clearance fit with corresponding electrode holes, machining the three electrodes on a slow wire electric spark wire cutting machine, clamping an electrode base 1 to the slow wire electric spark wire cutting machine, cutting a reference angle 2, machining three electrode holes according to the positions of the three electrode holes relative to the reference angle 2, aligning and clamping the electrode base 1 to the slow wire electric spark wire cutting machine again by rotating 90 degrees, machining three positioning holes of the base, wherein the diameter of each positioning hole is smaller than that of a threaded bottom hole, reaming and tapping are completed according to the diameter size of a thread, machining positioning holes in the three electrodes on the slow wire electric spark wire cutting machine is completed, and positioning pins of the three electrodes, three diamond-shaped positioning pins and the center shaft electrode are formed on the slow wire electric spark wire cutting, And the three inner hexagonal jackscrews are assembled to the base as required to form the special electrode for machining the cavity of the micro-duplicate gear mold.

Then, the prepared special electrode is used for processing a micro-duplicate gear die cavity 15 blank in an electric spark forming mode, after alignment and clamping are carried out, the positioning of the horizontal plane of the base is based on the base reference angle 2, the positioning of the vertical direction of the base is based on the top surfaces of the three electrodes assembled on the base, and the forming processing of the large gear cavity, the small gear cavity and the integrated hole 16 is completed in sequence according to the size to be formed.

And finally, positioning the formed cavity 15 of the micro duplex gear mold by the end surface of the integral hole 16 and the end surface of the cavity of the large gear respectively to perform slow wire-cut electrical discharge machining twice, and finishing the machining of the central hole 19 in the fixed mold insert and the central hole 20 in the movable mold insert.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a little duplex gear mould die cavity processing private electrode, includes electrode base (1), its characterized in that: the base plane direction is seted up benchmark angle (2), the locating hole has been seted up to back end face (12), preceding terminal surface (13) set up the screw hole, electrode hole has been seted up on top surface (14), three electrode and locating hole separately of gear wheel electrode (3), pinion electrode (4) and central spindle electrode (5), first rhombus locating pin (6), second rhombus locating pin (7) and third rhombus locating pin (8), first hexagon socket head cap screw (9), second hexagon socket head cap screw (10) and third hexagon socket head cap screw (11).

2. The special electrode for machining the cavity of the micro-duplicate gear mold according to claim 1, wherein the special electrode comprises a base material and a plurality of electrodes, and the electrodes are arranged on the base material and are arranged in the cavities: the quasi-three-dimensional structure electrode of the electric spark forming micro duplex gear is divided into three two-dimensional structure electrodes, namely a large gear electrode (3), a small gear electrode (4) and a central shaft electrode (5).

3. The special electrode for machining the cavity of the micro-duplicate gear mold according to claim 1, wherein the special electrode comprises a base material and a plurality of electrodes, and the electrodes are arranged on the base material and are arranged in the cavities: locating hole, screw hole, electrode hole on the base all are designed and processed with the benchmark angle on the base, are located the left electrode base (1) electrode hole inboard sliding connection has gear wheel electrode (3), is located the centre electrode base (1) electrode hole inboard sliding connection has pinion electrode (4), is located the right electrode base (1) electrode hole inboard sliding connection has center pin electrode (5).

4. The special electrode for machining the cavity of the micro-duplicate gear mold according to claim 1, wherein the special electrode comprises a base material and a plurality of electrodes, and the electrodes are arranged on the base material and are arranged in the cavities: positioning holes which are the same as the center lines of the corresponding base positioning holes are formed in the large gear electrode (3), the small gear electrode (4) and the central shaft electrode (5) in the direction vertical to the axis of the electrodes; positioning holes in the rear end face (12) of the electrode base (1) are respectively connected with a first diamond positioning pin (6), a second diamond positioning pin (7) and a third diamond positioning pin (8) in a sliding mode from left to right, and each diamond positioning pin is respectively matched with a positioning hole in the large gear electrode (3), a positioning hole in the small gear electrode (4) and a positioning hole in the central shaft electrode (5) through corresponding base positioning holes; the electrode base (1) is characterized in that a threaded hole of the front end face (13) is respectively and spirally connected with a first inner hexagonal jackscrew (9), a second inner hexagonal jackscrew (10) and a third inner hexagonal jackscrew (11) from left to right, and each inner hexagonal jackscrew is respectively clamped with the large gear electrode (3), the small gear electrode (4) and the central shaft electrode (5) through corresponding base threaded holes.

5. The special electrode for machining the cavity of the micro-duplicate gear mold according to claim 1, wherein the special electrode comprises a base material and a plurality of electrodes, and the electrodes are arranged on the base material and are arranged in the cavities: the formed micro-duplicate gear die cavity (15) comprises a fixed die insert (17) and a movable die insert (18); the central hole (19) in the fixed die insert and the central hole (20) in the movable die insert are formed by dividing an integrated hole (16) in a cavity of the formed micro-duplex gear die.