Introduction of Jiangsu Tianqixing Robot: How to choose the installation fixture of injection molding manipulator?

When selecting and installing fixture for injection molding manipulator, the following factors need to be considered:

1. Shape and size of injection molded products

Shape adaptation: If the injection molded products are regular geometric shapes, such as cubes and cylinders, corresponding simple jaws can be selected, such as V-shaped jaws for cylindrical products. For products with complex shapes, irregular curved surfaces or thin-walled structures, it is necessary to use a special copying fixture, which can closely fit the shape of the product to avoid damage to the product during grasping. For example, for an electronic product injection molded part with a complex curved shell, the grasping part of the fixture should be designed in a shape consistent with the curve of the product shell.

Size matching: the size range of the fixture should be able to adapt to the size of the product. Ensure that the opening size and clamping range of the fixture can effectively grasp the product, and it can still work normally when the product size fluctuates (such as product size changes due to die wear or process adjustment). For example, for small precision injection molding parts, a small precision fixture should be selected, whose finger part has high dimensional accuracy and can accurately grasp small parts; For large injection molding products, such as car bumpers, large and powerful fixtures are needed to ensure stable grasping.

2. Material characteristics of injection molded products

Soft materials: If the injection products are soft materials, such as soft PVC and silica gel, the clamping force of the fixture should be moderate. It is necessary to use a clamping jaw wrapped in soft material or a vacuum adsorption fixture to prevent the product from being pinched. For example, when grasping soft injection products such as silicone buttons, you can use a gripper with a silicone pad to cushion the clamping pressure through the elasticity of the silicone pad.

Hard materials: For hard materials, such as ABS, PP, etc., the fixture needs to have enough strength and rigidity to bear the weight and clamping force of the product, so as to ensure that the product will not slip during grabbing and handling. You can choose the metal gripper, and determine the shape and clamping mode of the gripper according to the weight and surface characteristics of the product.

3. Production batch and production efficiency requirements

Batch size: For mass production, the durability and stability of fixtures are the key. Fixtures with reliable quality, simple structure and easy maintenance should be selected to reduce the production interruption caused by fixture failure. For example, in a factory that produces plastic toys on a large scale, a standardized mechanical gripper can be selected, which has been verified by a lot of practice and has high stability and durability.

Efficiency requirements: If the production efficiency is high, the action speed and grasping accuracy of the fixture need to be considered. Choose a fixture that can be opened and closed quickly and positioned accurately, and it can cooperate well with the control system of injection molding manipulator to realize efficient automatic production. For example, the pneumatic quick gripper has a fast response speed, which can complete the grasping and releasing actions in a short time and improve the overall production efficiency of injection molding.

4. Universality and adjustability of fixture

Versatility: in the multi-variety injection molding production environment, try to choose a fixture with strong versatility. For example, some multifunctional clamping jaws can adapt to injection molding products with different shapes and sizes by changing the fingers of clamping jaws or adjusting the spacing between clamping jaws, which can reduce the procurement cost and replacement frequency of fixtures.

Adjustable: the fixture should have certain adjustable parameters, such as clamping force, jaw spacing, angle, etc. In this way, in the face of different injection molding products or production process changes, the fixture can be easily adjusted to meet the new production needs.

5. Compatibility with injection molding machines and manipulators

Mechanical interface matching: the fixture needs to match the end effector interface of the injection manipulator. Ensure that the installation size and connection mode of the fixture (such as the size of flange connection and the position of screw holes) are suitable for the end of the manipulator, so that it can be firmly installed on the manipulator.

Control system integration: the control signals of the fixture (such as the gas path control signal of the pneumatic fixture and the circuit control signal of the electric fixture) should be integrated with the control system of the injection manipulator. In this way, the control system of the manipulator can uniformly control the action of the fixture and realize the coordinated operation of the whole automatic production process.

6. Cost factor

Procurement cost: on the premise of meeting the production demand, compare the prices of different brands and types of fixtures. Considering the cost performance of fixture, avoid excessive pursuit of high-end complex fixture and lead to high cost.

Usage cost: including fixture maintenance cost, wearing parts replacement cost, energy consumption (such as compressed air consumption of pneumatic fixture), etc. Choosing a fixture with low cost can reduce the long-term production cost. For example, some simple mechanical fixtures are relatively easy to maintain and repair, and the cost is low; The complex electric servo fixture is powerful, but the maintenance cost may be high.