The most detailed design method for automatic release of internal threads！

Confirm the design scheme:

1.Automatic mold release method for products with internal threads, usually with screw, hydraulic motor, cylinder with rack and pinion. Front and rear mold parting. Drive method. The above methods have their own advantages and disadvantages.

A. Screw mechanism includes: multi-head screw, matching brass nut, gear... . But the screw, nut processing is extremely difficult, the pitch is usually taken 55 - -80mm, 5, 6 head teeth, DME, HASCO have standard parts for sale. Expensive, but there are imitations for sale in the market.

B. Hydraulic motor: there are standard parts for sale outside. Commonly used in products with more threads. When the product is stopped at the outer circumference. (Because the motor rotation can not be accurately positioned. Therefore, it is not suitable for the downward movement of the threaded core to exit the product) motor usually with the chain, sprocket drive.

C. Cylinder with rack: only suitable for the case of a small number of thread teeth (such as 2 to 4 teeth. ...) If the number of teeth is large, the transmission ratio must be larger, resulting in larger die blanks. If the transmission ratio is small, the cylinder stroke will be too long.

2. When designing, according to the product stopping mode and the number of threads, consider the drive mode.

3. Take the same modulus of transmission gear, usually 1.5, 2, 2.5 standard straight teeth with pressure angle of 20 degrees. Available 738, NAK80, and other steel heat treatment, wire cutting to make. The transmission ratio is usually 2 to 3.5.

4. Direction of rotation of the threaded core. If the product thread is right-handed. Then the threaded core is rotated clockwise. This determines the direction of rotation of the transmission mechanism.

Design of tooth shaft part structure：

Cylinder with rack and pinion with internal thread

1. The modulus m of rack and pinion is often taken as 1.5, 2, 3... The center distance between each two teeth of the rack is 3.14 xm

2. The stroke of the cylinder is:

“z1”is the number of teeth of the gear on the threaded shaft.

“n”is the number of turns of the thread on the product.

“i”is the ratio of the two intermediate gears.

3. The threaded shaft can be moved up and down during the working process.

4. The threaded sleeve can be made of copper alloy.

Motor drive:

1. The hydraulic motor drives the sprocket through the chain, so as to exit the product.

2. Motor drive can not be accurately positioned, so the tooth shaft can not move up and down.

3. Motor, chain, sprocket, bearing... There are standard parts for sale.

4. The motor is best arranged in the sky side.

1. This structure is driven by the motor through the chain.

2. Motor, chain, sprocket and bearing are standard parts.

3. The middle of the back teeth (thread) backwater mouth.

Screw out internal thread structure.

Action principle:

The screw is fixed in the front die and cannot be rotated. The nut is fixed on the rear side of the die. When the front and rear die are opened, the nut rotates around the screw under the action of external force, which drives the gear and tooth shaft to rotate, as shown in the figure above. Therefore, the gear shaft moves up and down while rotating, thus separating the product.

Two internal threads with two sloping tops

1. This structure is suitable for products with internal thread and through-hole structure. (If the product is blind hole type, you can add a pad under the B plate, let the B plate float first, so that the inner line bit will move)

2. When the A and B plates are opened, the inner travel position slides inward. Disengage the buckling position. Then the ejector plate will push the two inclined tops out of the rest of the buckle, and eject the product.

3. This structure is also suitable for products with a full circle of inverted buckle on the inside.

Shrinkable Cores

DME Retractable Cores

Suitable for products with threads or full turns with inverted buckles

DME, HASCO have this type of standard parts for sale, but the price is expensive

This product (digital camera housing) with internal threads, more teeth, the use of this up and down type core structure is more reasonable.

Description:

1. This is another kind of shrink core, each slider connected to the body of the slider

2. Made by wire cutting (slow walking wire). Because there is no reference, processing is more difficult.

3. This structure can form the whole circle of products with inverted buckle.