CN207447909U - A kind of special milling fixture for processing the U-shaped waist of circuit breaker base - Google Patents

Abstract

The utility model discloses a kind of special milling fixtures for processing the U-shaped waist of circuit breaker base, and the positioning plate by being mounted on flat-nose pliers regular jaw and the movable plate on flat-nose pliers moving jaw form；The middle part of positioning plate medial surface is fixed with positioning disc by two slotted cheese head screws, and the top of positioning disc is higher by the upper surface of positioning plate；The lower part of positioning plate medial surface is equipped with short pin, and short pins position is located at the one side of positioning plate perpendicular bisector in the lower section of positioning disc；When Workpiece clamping is when on special milling fixture, in the endoporus at the positioning disc insertion workpiece rear portion on positioning plate, in a ratchet mounting hole of short pin insertion workpiece, workpiece is pressed on positioning plate by movable plate.The utility model ensures processing quality, and convenient mounting and clamping, production efficiency greatly improve.

Description

A special milling fixture for processing the U-shaped waist of the circuit breaker base

technical field

The utility model belongs to the field of circuit breaker base processing fixtures, in particular to a special milling fixture for processing the U-shaped waist of the circuit breaker base.

Background technique

The base of a standard high-voltage AC SF6 circuit breaker will have a U-shaped waist with a width of 17.2mm and an included angle of 87.6° milled out on its side, but for now, this is still a difficult point in the processing of the circuit breaker base.

When using ordinary machine tools for manual processing, the U-shaped waist with a width of 17.2mm and an included angle of 87.6° is processed by the marking-milling-turning clamping-milling method. The processing time of this method is too long, and the U-shaped waist The angle cannot be guaranteed, and its position with the Φ11mm holes on the left and right sides cannot be accurately controlled, so the product quality cannot be reliably guaranteed, resulting in high scrap rate and low production efficiency.

In the case of automatic machining with a four-axis machining center, it is necessary to complete the processing of the 8×Φ11mm ratchet mounting hole and the Φ16 deep 46mm eccentric hole in one clamping, and then re-clamp, and use the indexing device to mill the width of 17.2mm and the included angle of 87.6° U-shaped waist. The process of this method is relatively concentrated, the product quality can be well guaranteed, and the scrap rate is low, but the product structure is relatively simple, the overall accuracy requirements are not high, and re-clamping is required when milling the U-shaped waist, which takes up machine time Long, the production cost is higher.

Utility model content

In view of the above difficulties in processing the base of the high-voltage AC sulfur hexafluoride circuit breaker, the utility model aims to provide a special milling fixture for processing the U-shaped waist of the circuit breaker base, so as to realize the precise milling of the U-shaped waist.

In order to achieve the above-mentioned technical purpose and achieve the above-mentioned technical effect, the utility model is realized through the following technical solutions:

A special milling fixture for processing the U-shaped waist of the circuit breaker base, which is composed of a positioning plate installed on the fixed jaw of the vise and a movable plate installed on the movable jaw of the vise; the middle part of the inner surface of the positioning plate is provided with a The positioning disc used for positioning the base of the circuit breaker, the positioning disc is fixed on the positioning plate by two slotted cylindrical head screws, and the upper part of the positioning disc is higher than the upper end surface of the positioning plate ; The lower part of the inner surface of the positioning plate is provided with a short pin for determining the milling angle of the U-shaped waist, the short pin is located below the positioning disc and on one side of the vertical bisector of the positioning plate;

When the circuit breaker base is clamped on the special milling fixture, the circuit breaker base is located between the positioning plate and the movable plate, and the positioning disc on the positioning plate is embedded in the circuit breaker. The short pin is inserted into a ratchet installation hole of the circuit breaker base, and the movable plate is attached to it from the other side of the circuit breaker base, and the The circuit breaker base is pressed against the positioning plate.

Further, according to the national standard GB/T1801-2009, the base hole system priority and common fit, the fit size of the short pin and the positioning plate is Φ11H7/k6.

Further, according to the national standard GB/T1801-2009, the base hole system priority and common fit, the fit size of the positioning disc and the inner hole at the rear of the circuit breaker base is Φ100H9/d9.

Further, the two slotted cylindrical head screws are respectively located on the left and right sides of the center of the positioning disc, and are symmetrically distributed.

The working principle of the utility model is as follows:

When clamping, directly set the circuit breaker base to be processed on the positioning plate, locate the U-shaped waist milling angle through the positioning disc and the short pin, and finally clamp it with the movable plate installed on the movable jaw of the flat-nose pliers. Yes, simple structure, easy assembly and disassembly. When processing, mill one side first, remove the circuit breaker base cover and turn the original position by 87.6° to mill the other side after milling.

The beneficial effects of the utility model are:

1. The utility model first uses short pins and positioning discs to perform positioning to determine the milling angle of the U-shaped waist, and then clamps through the movable plate installed on the movable jaw of the flat-nose pliers, and relies on the positioning accuracy of the fixture itself to control the accuracy of the parts to ensure The processing quality is high, and the clamping is convenient, the production efficiency is greatly improved, and the processing problem of the U-shaped waist of the high-voltage AC sulfur hexafluoride circuit breaker base is completely solved.

2. The utility model disperses the processing procedures, and processes the U-shaped waist with a width of 17.2mm and an included angle of 87.6° on the circuit breaker base separately. The processing content is small, and the existing production equipment can be rationally used.

3. The utility model has lower technical requirements for workers, and can adopt the most reasonable cutting amount, reduce maneuvering time, improve production efficiency and reduce production cost.

4. The utility model has simple structure and convenient manufacture. The material used is 45 steel, which has good cutting performance, low manufacturing cost, convenient operation, safety and reliability.

The above description is only an overview of the technical solution of the utility model. In order to understand the technical means of the utility model more clearly and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiment of the utility model with accompanying drawings. back. The specific embodiment of the utility model is given in detail by the following examples and accompanying drawings.

Description of drawings

The drawings described here are used to provide a further understanding of the utility model and constitute a part of the application. The schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute improper limitations to the utility model. In the attached picture:

Fig. 1 is the assembly diagram of the utility model and the circuit breaker base.

Fig. 2 is the front view of the utility model.

Fig. 3 is a left view of the utility model.

Detailed ways

The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

As shown in Figure 1-3, a special milling fixture for processing the U-shaped waist of the circuit breaker base is composed of a positioning plate 1 installed on the fixed jaw of the vise and a movable plate 2 installed on the movable jaw of the vise; The middle part of the inner surface of the positioning plate 1 is provided with a positioning disc 4 for positioning the circuit breaker base 3, and the positioning disc 4 is fixed on the positioning plate 1 by two slotted cylindrical head screws 5, and The top of the positioning disc 4 is higher than the upper end surface of the positioning plate 1; the bottom of the positioning plate 1 inner surface is provided with a short pin 6 for determining the U-shaped waist milling angle, and the short pin 6 is located at Below the positioning disc 4, and on one side of the vertical bisector of the positioning plate 1;

When the circuit breaker base 3 is clamped on the special milling fixture, the circuit breaker base 3 is located between the positioning plate 1 and the movable plate 2, and the positioning circle on the positioning plate 1 The disc 4 is embedded in the inner hole at the rear of the circuit breaker base 3, the short pin 6 is inserted into a ratchet mounting hole of the circuit breaker base 3, and the movable plate 2 is removed from the circuit breaker base 3 The other side of the circuit breaker is attached to it, and the circuit breaker base 3 is pressed against the positioning plate 1 .

Further, according to the national standard GB/T1801-2009 stipulated in the national standard GB/T1801-2009 that the base hole system is preferential and commonly used, the matching dimension of the short pin 6 and the positioning plate 1 is Φ11H7/k6.

Further, in accordance with the national standard GB/T1801-2009, which stipulates that the base hole system is preferential and commonly used, the matching dimension between the positioning disc 4 and the inner hole at the rear of the circuit breaker base 3 is Φ100H9/d9.

Further, the two slotted cylindrical head screws 5 are respectively located on the left and right sides of the center of the positioning disc 4, and are distributed symmetrically.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (4)

1. a kind of special milling fixture for processing the U-shaped waist of circuit breaker base, it is characterised in that：By being mounted on flat-nose pliers regular jaw On positioning plate（1）And the movable plate on flat-nose pliers moving jaw（2）Composition；The positioning plate（1）Medial surface Middle part is used to position circuit breaker base there are one setting（3）Positioning disc（4）, the positioning disc（4）Pass through two flutings Fillister head screw（5）It is fixed on the positioning plate（1）On, and the positioning disc（4）Top be higher by the positioning plate（1）'s Upper surface；The positioning plate（1）There are one the short pins for being used to determine U-shaped waist milling angle for the lower part setting of medial surface（6）, it is described Short pin（6）Positioned at the positioning disc（4）Lower section, and positioned at the positioning plate（1）The one side of perpendicular bisector；

When the circuit breaker base（3）When being installed on the special milling fixture, the circuit breaker base（3）Positioned at described fixed Position plate（1）With the movable plate（2）Between, the positioning plate（1）On positioning disc（4）The embedded circuit breaker base（3） In the endoporus at rear portion, the short pin（6）It is inserted into the circuit breaker base（3）A ratchet mounting hole in, the movable plate（2） From the circuit breaker base（3）Opposite side be bonded with it, by the circuit breaker base（7）It is pressed on the positioning plate（1）On.

2. the special milling fixture of the processing U-shaped waist of circuit breaker base according to claim 1：The short pin（6）With it is described Positioning plate（1）Fit dimension be Φ 11H7/k6.

3. the special milling fixture of the processing U-shaped waist of circuit breaker base according to claim 1：The positioning disc（4）With The circuit breaker base（3）The fit dimension of the endoporus at rear portion is Φ 100H9/d9.

4. the special milling fixture of the processing U-shaped waist of circuit breaker base according to claim 1：Two fluting socket caps Screw（5）It is located at the positioning disc respectively（4）The left and right sides at center, is symmetric.