CN105424503A - Plastic material quality prediction method - Google Patents

Abstract

The invention relates to the technical field of plastic materials, in particular to a method for prejudging the quality of a plastic material for a keyboard; before formal production of each batch of plastic, firstly, a test board is made of plastic, the test board comprises a sheet-shaped substrate, a plurality of screw columns are vertically formed on the substrate, and the hole diameter and the height of each screw column on the test board are consistent with those of each screw column on a keyboard; then, testing the screw columns by a digital torsion tester, locking screws by using the maximum value of the reference force, and judging that the batch of plastics does not meet the requirements if at least one screw column cracks, and judging that the batch of plastics does not crack and meets the requirements if the batch of plastics does not crack; the invention can test the stress of the screw columns formed by injection molding of the raw materials of the batch before the keyboard is produced in large batch, and can be produced if the stress meets the requirements, and if the stress does not meet the requirements, the production is not put into production, thereby realizing quality prejudgment, greatly reducing the rework rate of products, reducing defective products, and reducing the waste of production, human resources, transportation and storage costs, and being worthy of popularization.

Description

Plastic material quality prediction method

technical field

The invention relates to the technical field of computer keyboards, in particular to a method for predicting the quality of plastic materials used in keyboards.

Background technique

With the continuous development of electronic technology, computers are becoming more and more popular. Basically, a computer is equipped with a keyboard. Gradually, independent products with various shortcut functions are sold separately on the market. No matter what kind of keyboard, basically They are all made of plastic, and the widely used keyboard includes a keyboard panel and a base, and the keyboard panel and the base are locked by screws. There are screw posts and holes formed on the keyboard panel and the base, and the hole diameters of the screw posts at different positions may be different, and the force range of each screw post may be different. In addition, the injection molding raw materials used in each batch of keyboards may be different, and the amount of modifier added to the material is different, resulting in different batches of keyboards with different properties. The force range of the screw post at the same position It may be different.

The production process of the keyboard is generally as follows: first, the plastic parts of the keyboard, such as the keyboard panel and the base, are produced by the injection molding factory, and then the injection molding factory ships them to the keyboard manufacturer, who assembles and produces them.

Before the keyboard is delivered to the keyboard manufacturer, the injection molding factory often only conducts conventional tests such as impact and tension on the keyboard. When the keyboard manufacturer assembles the keyboard, the operator uses an electric screwdriver to screw the screw into the screw column to assemble the keyboard. If the downward force of the electric screwdriver is too large, which exceeds the force range of the screw column, the screw column will be squeezed and burst, causing the keyboard to not be locked tightly, and the keyboard will be scrapped. The injection molding, assembly, storage, transportation and other links of the keyboard need to Doing it all over again, the cost of this waste is very high.

In actual production, keyboard manufacturers may use different forces to lock the screws due to different batches of materials, different screws, and different screw column designs. In this way, there will be discrepancies between the keyboard manufacturer and the injection molding factory. Data is not equal. The reason why the force of the screw column exceeds the range is that the raw material used for injection molding, that is, the plastic material is unstable, and the performance of each batch of plastic material may be different. However, the injection molding factory of the keyboard did not conduct any tests on the plastic material, and directly produced it. The injected keyboard shell was directly sent to the keyboard manufacturer for assembly, so that the force of the aforementioned screw column exceeded the range.

Especially for the current recycling and reuse of waste plastic materials, the properties of the substances that may be mixed in the raw materials are different. Whether the properties of the produced plastic particles meet the requirements of keyboard manufacturers, there is currently no exact data testing and testing methods. test tools.

Therefore, based on the defects of the above-mentioned existing keyboard production, it is necessary to improve the existing keyboard production method and tools.

Contents of the invention

The purpose of the present invention is to provide a method for predicting the quality of plastic materials in view of the deficiencies in the prior art, which solves the defects existing in the existing keyboard production: the screw column may be squeezed and burst when the keyboard is assembled, and all processes are reworked. .

In order to achieve the above purpose, the present invention provides a method for predicting the quality of plastic materials. Before the formal production of each batch of plastics, a test board is first made of plastic. The test board includes a sheet-shaped substrate, and a plurality of screw columns are vertically formed on the substrate. The hole diameter and height of the screw posts on the test board are consistent with those of the keyboard; then, test the screw posts with a digital torque tester, and use the maximum value of the reference force to lock the screws. If at least one screw post bursts, it is judged This batch of plastic does not meet the requirements, and if there is no burst, it meets the requirements.

The hole spacing between each screw column is 1-2cm.

Further, the test board is fixed in the plastic lock screw strength tester. The plastic lock screw strength tester includes a base and a cover plate. The base has a test slot for placing the test board. The test hole corresponds to the screw post of the test board.

A concave surface is formed between the test hole and the surface of the cover plate.

The base plate is square, and its sides are inclined sides.

One end of the test slot extends to the side of the base.

The side of the test groove is an inner inclined surface.

Test holes include through holes and counterbore.

The beneficial effect of the present invention is that: before mass production of the keyboard, the force of the batch of raw materials injection molded into screw columns can be tested, if it meets the requirements, it can be produced, if it does not meet the requirements, it will not be put into production, and the quality assurance Pre-judgment can greatly reduce the rework rate of products and reduce defective products, and will not cause production waste, waste of human resources, waste of transportation costs, and waste of storage costs. It is worth promoting.

Description of drawings

Fig. 1 is a schematic flow chart of the present invention.

Fig. 2 is a schematic diagram of the tester of the present invention.

Fig. 3 is a schematic diagram of the base of the tester of the present invention.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings.

See Fig. 1-Fig. 3, the plastic lock screw strength tester of the present invention, comprises: base 2, cover plate 1, has the test groove 5 that is used to place test plate on the base 2, and there can be a plurality of test grooves 5, A plurality of test holes 4 are opened on the cover plate 1 , and the test holes 4 correspond to the screw columns 8 of the test plate 7 .

Specifically, a concave surface 3 is formed between the test hole 4 and the surface of the cover plate 1. The design of this concave surface 3 can increase the strength of the test hole 4, so that the test hole 4 can function as a keyboard when it is assembled with the keyboard. The strength effect of the shell.

More specifically, one end of the test slot 5 extends to the side of the base 2 .

Further, the side surface of the test groove 5 is an inner inclined surface.

Furthermore, the test hole 4 includes a through hole and a counterbore, and this design makes the test hole 4 very close to the actual screw post of the keyboard.

The test board 7 used in conjunction with the tester includes a square plate-shaped substrate, and the screw posts 8 are vertically formed on the substrate. There are a plurality of screw posts 8 formed on the test board 7. The aperture and height of the screw posts 8 on the test board 7 Consistent with the screw posts of the keyboard. The hole spacing between the screw columns 8 on the test board 7 is 1-2 cm, so as to increase the strength of the screw columns and reduce interference. The side of the substrate is an inclined edge 9, and this inclined edge 9 just matches the inner inclined surface of the test slot 5. The test board 7 is inserted from one side of the test slot 5, and the test board 7 can be stably positioned in the test slot 5 for testing. .

The keyboard manufacturer gives a certain style of keyboard, and the force of locking the screw is 0.3 to 0.6 N. m, then, this strength range is provided to the injection molding factory. Before the injection molding production of this batch of keyboards, the test board 7 is first produced, the test board 7 is produced by the same batch of plastic material, and a plurality of screw columns 8 are formed on the test board 7, and then the test board 7 is put into the test In the instrument, the screw column 8 is tested by a digital torque tester, wherein the force given by the aforementioned keyboard manufacturer is used for testing, that is, the upper limit of the range is 0.6 N. Each screw column 8 is screw-locked with a strength of 1 meter, only when the force of all the screw columns 8 can be greater than the upper limit of 0.6 N. m, the tested plastic material meets the requirements. If the screw column 8 bursts, the plastic material of this batch needs to be modified, and then tested after modification.

In this way, before the mass production of the keyboard, the force of the batch of raw materials injection molded into screw columns can be tested. If the requirements are met, it can be produced. If the requirements are not met, it will not be put into production. Some keyboard production can greatly reduce the rework rate of products, reduce defective products, and will not cause production waste, waste of human resources, waste of transportation costs, and waste of storage costs. It is worth promoting.

Of course, the above-described embodiments are only preferred examples of the present invention, and do not limit the implementation scope of the present invention, so all equivalent changes or modifications made according to the structure, features and principles described in the scope of the patent application of the present invention, All should be included in the patent scope of the present invention.

Claims (8)

1. plastic rubber material quality pre-judging method, it is characterized in that: every a collection of plastics are before formal production, and first use plastic production test board, test board comprises plate shape substrates, on substrate, vertical forming has multiple screw column, and aperture, the height of the screw column on test board are consistent with the screw column of keyboard; Then, tested screw column by digital torque test meter, with carrying out the operation of lock screw with reference to the maximal value of dynamics, there is explosion at least one screw column, then judges that this batch of plastics are undesirable, do not occur meeting the requirements explosion.

2. plastic rubber material quality pre-judging method according to claim 1, is characterized in that: between each screw column, pitch of holes is 1-2cm.

3. plastic rubber material quality pre-judging method according to claim 1, it is characterized in that: test board is fixed in plastic latch screw dynamics tester, plastic latch screw dynamics tester comprises pedestal, cover plate, pedestal has the test trough for placing test board, cover plate offers multiple instrument connection, instrument connection is corresponding with the screw column of test board.

4. plastic rubber material quality pre-judging method according to claim 3, is characterized in that: be formed with concave panel between instrument connection and the surface of cover plate.

5. plastic rubber material quality pre-judging method according to claim 3, is characterized in that: substrate is square, its limit is inclined side.

6. plastic rubber material quality pre-judging method according to claim 3, is characterized in that: one end of test trough extends to the side of pedestal.

7. plastic rubber material quality pre-judging method according to claim 5, is characterized in that: the side of test trough is introversion inclined-plane.

8. plastic rubber material quality pre-judging method according to claim 3, is characterized in that: instrument connection includes through hole and counterbore.