Technical experience of fixture processing

- Feb 23, 2019 -

In the main Machining process, there are CNC Machining, CNC turning, Auto lathe turning,CNC Milling, Stamping, Sheet metal fabrication, Casting, Injection molding etc.


Tooling fixture plays an important role in mechanical equipment.


1. Processing of tooling parts

First of all, the machining requirements of tooling parts should be analyzed. Taking a drilling tool body as an example, the inner cavity of the drill tool body needs to be hardened above 55HRC, and its special part must be used as drilling casing. In order to avoid affecting the quality of drilling tools, we need to quench the whole of the drilling tool and then do the line tangent molding. The main purpose of this is to prevent the production of hot machining and to cut out the drill casing by wire cutting. The forming rate of the workpiece can also be improved by the transformation of the workpiece from the split type to the integral type.


2. Unity of clamping, supporting elements

Some of the more complex fixtures, complex fixtures will be set in some replica support elements, such as our common screw compression nut, screw adjustment bolts and other parts. So we have to analyze the drawings before processing, and then carry out specific processing operations.


3. Solving the problem of Multi-datum of parts

When determining the reference of the fixture, the dimension of the part should be determined from different reference points, then the workpiece is fixed according to the corresponding size, and then the workpiece is positioned on the side of the workpiece by using the moving template. Then fix the movable template with the workpiece after cutting from the outside.


4. Adopt positioning compression device

In the course of actual processing, we will encounter various types of parts. Although the large holes have been machined, in order to ensure the size of the parts, we need to process the two holes to ensure the A size. In order to solve this problem, we can take the big hole positioning measure and use the guiding moving branch to locate D plane. This is done by locating the part at an angle to avoid rotation.


5. Practicability of fixture

In order to ensure the practicability of fixture, it must meet the requirements of mechanical installation.


6. Requirements for tolerances of shapes and positions on tooling drawings

On the specific machining drawings, the most demanding fixture will mark the tolerance value of shape and position. The purpose of this is to avoid mismatch with the mechanical equipment, so the strict standard is adopted. Avoid the waste of all kinds of economic expenses.