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Forming Process Of Footwear

2008/8/11 10:03:00 41751

Molding process

Cutting material, cutting of the upper and bottom parts, and the whole machining of the bottom parts are the preparatory processes for the synthesis of the bottom, or the assembly process of the components.

The main body of the synthetic process is the assembly process of the upper and sole.

It consists of three segments, that is, forming, combining and decorating.

Forming sequence

For configuration processing.

The upper part of the shoe is molded by the means of processing, relying on pressure, bending, stretching and supporting force.

The forming sequence is to complete the leather shoes frame structure.

Determine the style linetype.

Two, combining sequence

The molded upper or semi-finished products are combined with the sole parts, and the final assembly forms a pair of finished shoes processing engineering.

Because the combination segment is a specific product shoe with different technological means, lines and assembly forms to be embedded into the frame, which has a predetermined ideal appearance and internal quality, its style, rhythm, style and style vary greatly because of its different combination process.

Three, decoration order

Fill in the technical omission and decoration works.

Finish the project.

It will directly affect the appearance quality of finished shoes.

The implementation of the order is related to the level of the product.

Forming principle of tension rib

The forming of leather shoes is an important process of leather shoes.

The shape and beauty of leather shoes make the shoe last plastic positioner.

A planar cavity can form a space chamber with a certain capacity, and it depends on the shaping of shoes.

Leaving the last body can remain or remain unchanged for a long time, depending on the forming factors of the material itself and its surroundings.

When the shape of shoe last is different and the dividing method is different at the same time, the stress of the surface material is different in the process of stretching, so the shaping, shaping effect and appearance effect of the shoe will also change.

Therefore, for the products with different surface materials and different shoe last shape, the tensile force and the applied force should be different in the process of stretching.

1. Forming principle

(1) shaping of shoes

First of all, it depends on the curved stilt treatment and three-dimensional combination of the components to facilitate the pformation of the plane to the hemispherical type and the saddle type.

In the process of helping sample design, the technology of angle change is processed to make it close to and tend to the surface of the last.

In the upper part of the upper part, the upper part of the upper part is changed from a two-dimensional space to a three-dimensional space.

For example, the design of pick up handles is to pform the three-dimensional shoe into two dimensional plane.

The compatibilization curve appears at the joints between the middle and the back.

The shrunk of the upper lip of the steamed bun shoe is turned back into a semicircle of the last one.

(two) mechanical properties of upper (elasticity and plasticity)

Although the parts are treated by a twist, though they are close to the shoe last type, they must be subjected to a certain external force to make different parts of the body stretch and crumble, so that the surface can be closely attached to the last surface.

Therefore, if we want to shape, we must depend on the mechanical properties (elasticity and plasticity) of the material.

Elasticity: when objects are deformed by external forces, the object tries to restore the original state.

Plasticity: the shape of a shape after being deformed.

The material of leather shoes is generally made up of countless fibers. The net structure has a characteristic -- the principle of network connection. Therefore, under the action of external force, it has the properties of stretching and shrinking, that is, elasticity and plasticity.

The principle of mesh connection: 1) the force at one point will affect the force of the whole material.

2) in a certain direction, a certain tensile force will be subjected to a certain contraction force in the direction perpendicular to it.

Because of the obvious extension direction of natural leather, the down cutting of material is not only the requirement of wear life and appearance, but also the need of molding.

(three) with external conditions.

Depending on the elastic treatment of the upper and the elastic stretching and changing of the material, it can only be temporarily formed and difficult to be fixed for a long time. Only by means of external force and skeleton can the forming body under the action of external force be able to stabilize the solid after removing the external force.

The external factors of solid type are as follows:

1. with the help of main heel, inner Baotou, hook core and semi inner bottom, the cavity is fitted to the last body and the support body is finalized.

There is a certain rigidity between the main and inner Baotou.

The inner bottom, the semi insole and the center of the hook form a cavity.

2. binding the body and skeleton with adhesive, making the body and skeleton together and shaping according to the shape of the last body.

Such as adhesion between materials.

3. with some linings, the performance of the body is changed, the elasticity of the body is reduced, the plasticity is enhanced, and the rigidity is solid.

4. suture methods, such as slit ridge, bun shoes, longitudinal reinforcement.

5. tension and damp heat.

Under the action of tension force, the leather changes along the direction of the force side, which is formed by the reaction force of the last body on the leather.

Under the action of moisture and heat, the elasticity of the material decreases and plasticity increases, which promotes the forming.

The three factors of forming principle are not isolated existence, but combined with each other or the three exist at the same time.

Two. Factors affecting the force and direction of the tension.

The base of the model is the curling process and the forming of the parts for the splicing and stitching of the parts.

Though the above process has been done, the support has been close to the shape of the last body, but many parts are not consistent with the last body, and the external force must be used to make the clam tightly attached to the last surface.

The upper part must be considered as the upper material, the style and the last shape.

(1) upper material

Materials differ in magnitude and direction.

The rule of stretching force is: for the low tensile strength and small extension of the surface material, the tensile force is too large, which will make the face crack.

For the low tensile strength and large stretches, the excessive deformation force will cause deformation.

For high tensile strength and large stretches, the tensile force is too small to be stretched.

General rule: 1) the same type of leather, the higher the oil content, the greater the tensile force.

2) strong leather is more powerful than leather.

Such as: pig, cow leather and sheep face leather.

3) sheep leather and synthetic leather are of high elasticity and low strength.

The rule of tension is to disperse the wrinkles of the feet as far as possible, so that they do not pile up in one place.

(two) footwear style

The force and direction should be different for different structure.

The resistance and reaction force of long faced upper and short upper are different.

The difference between the whole structure and the inserted structure is very large in all directions.

Vertical segmentation and horizontal segmentation.

Strip weaving, hole punching and so on are all different.

Common styles are prone to defects:

1. short face shoes

Too much tension will cause shoe deformation and shrinkage.

2. long face shoes

If the longitudinal force is too large, the raised surface does not conform to the last curve.

Horizontal force is too big, the side surface appears horizontal wrinkles.

The solution is: first, two of the predetermined type is to use a certain angle of diagonal force.

3. shoes with or without covers.

Too much or too little force will affect the shape of the head, and the side line of the groove will not be enough.

4. woven and engraved upper structure

Under the action of external force, mesh and holes are easy to deform.

(three) last type

The last type is smooth and sloping.

The last shape is saddle shaped last.

The longitudinal tension should not be too large.

A pointed last shape.

The square head type of the last type, the sleek last shape of the last shoe has a larger rib force, and the last one is sharp; the last type with a sharp edge is less suitable for exertion.