CN105291317A - Cylindrical die with variable external diameter - Google Patents

Abstract

The invention provides a cylindrical mold with a variable outer diameter, which includes a support cylinder, the support cylinder is provided with an inclined hole, the outer wall is coaxially arranged on the outside of the support cylinder, and the inner side of the outer wall is provided with an inclined block matched with the inclined hole; when driving When the device gives the outer wall a driving force along the axial direction of the support cylinder, the inclined block on the outer wall moves along the inclined hole on the support cylinder, driving the entire outer wall to move axially and radially along the support cylinder at the same time, realizing the change of the outer diameter of the outer wall. The driving device includes a sleeve-shaped active part, the right end of which is turned outward and is in contact with the left end surface of the outer wall; the left and right connecting parts are both cylindrical in shape with one end turned inward, and the cylindrical surfaces of the two are connected; the left connection The left end of the part is turned inward and is arranged on the left side of the part where the active part is turned outward, and the right end of the right connecting part is turned inward and is arranged on the right side of the outer wall retaining ring. The invention uses a mechanical method to realize the increase or decrease of the diameter of the mold, and the mold is equal in diameter along the length direction without taper, and has the advantages of strong adaptability, convenient portability, easy demoulding and low manufacturing cost.

Description

A cylindrical mold with variable outer diameter

technical field

The invention relates to a mold, in particular to a cylindrical mold with variable outer diameter, which can be used as a core mold for producing tubular textile composite materials.

Background technique

The process of producing fiber-reinforced tubular textile composites such as carbon fiber, glass fiber, and aramid fiber is: firstly, a cylindrical fiber braid is produced by weaving or weaving, and it is placed on the outside of a cylindrical mold with the same diameter; The mold is immersed in the resin together, so that the resin can fully penetrate into the gaps in the fabric, and then, wrap it tightly with plastic cloth or tape fabric to squeeze out the excess resin, and finally heat it in the oven or in the natural environment Dry and solidify. After the material is solidified, the mandrel is pulled out from the middle. Due to the characteristics of the weaving process and the flexibility of the fiber, the diameter of the fiber braid is often not accurate enough to match the diameter of the mandrel, but changes within a certain range, which will cause the following two situations in the compounding process: Situation First, the diameter of the fiber braid is smaller than the diameter of the mandrel, which makes it difficult to fit the fabric on the mold, and the yarn direction of the fabric is shifted or twisted, which affects the final mechanical properties of the composite material; in the second case, the diameter of the braid is larger than the diameter of the mandrel, The fabric can be easily fitted onto the mandrel, but during curing, due to the extrusion of the outer wrapping film, the fibers are not fully stretched, which will seriously affect the mechanical properties of the final composite. On the other hand, it is difficult to demould the cylindrical mandrel.

The patent "Variable Diameter Die for Producing FRP Pipes" (Application No. 2006100663240) can solve the above problems. However, the driving method it adopts is hydraulic or pneumatic driving, so the whole mold is relatively large, complicated and inconvenient to carry. In addition, after the diameter of the mold becomes larger, if you want to make the diameter smaller, it depends on the elastic potential energy of the mold. In some cases, if the elastic potential energy of the mold is not very good or the mold and the base material are bonded together, the demoulding is still difficult. raletively hard.

Contents of the invention

The technical problem to be solved by the present invention is to provide a variable-diameter cylindrical mold with strong adaptability, easy portability, easy demoulding and low cost.

In order to solve the above technical problems, the technical solution of the present invention is to provide a cylindrical mold with variable outer diameter, which is characterized in that: it includes a support cylinder, the support cylinder is provided with inclined holes, the outer wall is coaxially arranged on the outside of the support cylinder, and the outer wall The inner side is provided with a slanting block that cooperates with the slanting hole on the support cylinder; the outer wall is connected with the driving device;

When the driving device gives the outer wall a driving force along the axial direction of the support cylinder, the inclined block on the outer wall moves along the inclined hole on the support cylinder, driving the entire outer wall to move axially and radially along the support cylinder at the same time, realizing the change of the outer diameter of the outer wall.

Preferably, the inclined holes are evenly distributed along the circumference of the support cylinder and distributed along the axial direction.

Preferably, the main part of the outer wall is uniformly cut along the circumference of a cylindrical tube whose inner diameter is the same as the outer diameter of the supporting tube.

Preferably, a retaining ring is provided outside one end of the outer wall.

Preferably, the retaining ring is divided by circular retaining rings along its circumference.

Preferably, the outer walls are evenly distributed along the circumference of the support cylinder, and the number of outer walls distributed along the circumference of the support cylinder is greater than or equal to three.

Preferably, when the slanting block on the outer wall cooperates with the slanting hole on the support cylinder, the shape formed by the outer surfaces of the plurality of outer walls is a cylindrical surface.

Preferably, the driving device is composed of a driving part, a left connecting part and a right connecting part;

The active part is in the shape of a sleeve, coaxially arranged on the outside of the support cylinder through threaded connection, and the right end of the active part is folded outward and contacts the left end surface of the outer wall;

Both the left connecting piece and the right connecting piece are in the shape of a cylinder with one end turned inward, and the cylindrical surfaces of the two are connected by threads; On the left side of the part turned outwards, the right end of the right connecting piece is turned inwards and the turned end surface is arranged on the right side of the retaining ring of the outer wall.

Preferably, when the diameter is increased, the active member is rotated, and the active member moves to the right to contact the left end surface of the outer wall, so that the outer wall moves obliquely upward along the right inclined surface of the inclined hole of the support cylinder, thereby expanding the outer wall; when reducing the diameter, The left connecting piece and the right connecting piece are relatively stationary, and the right connecting piece is in contact with the outer wall. When the active piece is rotated counterclockwise, the active piece moves to the left, driving the outer wall to move obliquely downward along the left slope of the inclined hole, thereby causing the outer wall to shrink.

The invention uses a mechanical method to realize the increase or decrease of the diameter of the mold, and the mold is equal in diameter along the length direction without taper, and has the advantages of strong adaptability, convenient portability, easy demoulding and low manufacturing cost.

Description of drawings

Fig. 1 is the structural representation when the diameter of the variable cylindrical mold provided by the present invention increases;

Fig. 2 is the structural representation when the diameter of the variable cylindrical mold provided by the present invention is reduced;

Fig. 3 is A-A sectional view among Fig. 2;

Fig. 4 is the structural representation of support tube;

Fig. 5 is a schematic diagram of the structure of the outer wall.

detailed description

In order to make the present invention more comprehensible, a preferred embodiment is described in detail below with accompanying drawings.

Referring to FIGS. 1 to 3 , the present invention provides a cylindrical mold with variable outer diameter, which is composed of a support cylinder 1 , an active part 2 , a left connecting part 3 , a right connecting part 4 and an outer wall 5 .

Referring to FIG. 4 , the support cylinder 1 has a certain thickness, and the support cylinder 1 is provided with oblique holes 11 , and the oblique holes 11 are evenly distributed along the circumference of the support cylinder 1 and distributed along the axial direction.

5, the outer wall 5 is divided into a main part 53, a slanting block 52, and a retaining ring 51; the main part is uniformly cut along the circumference of a cylinder whose inner diameter is the same as that of the support tube 1; there are multiple slanting blocks 52 located at In the middle of the inner surface of the main body part 53 , the inclined block 52 can cooperate with the inclined hole 11 on the support cylinder 1 ;

The outer wall 5 is coaxially sleeved on the outside of the support cylinder 1 and is evenly distributed along the circumference of the support cylinder. The number of outer walls distributed along the circumference of the support cylinder is greater than or equal to three. The inclined block 52 is located in the inclined hole 11 , so that the outer wall 5 can cooperate with the support cylinder 1 and move along the support cylinder slope 11 . The number of 5 outer walls is the same as the number of 11 inclined holes uniformly distributed along its circumferential direction on the support tube 1, so that when the inclined blocks on the outer wall cooperate with the inclined holes on the support tube, the figure formed by the outer surfaces of the multiple outer walls is a cylinder surface or a nearly cylindrical surface.

When the outer wall 5 is subjected to the axial force in the direction of the supporting cylinder of the driving device, the inclined block 52 on the outer wall can move along the inclined hole 11 on the supporting cylinder, thereby driving the entire outer wall 5 to move axially and radially along the supporting cylinder at the same time, realizing the outer surface of the outer wall The change in diameter of the composed cylindrical or cylindrical-like surface.

The driving device is composed of the active part 2 and the connecting part.

Wherein the active part 2 is in the shape of a sleeve, which is sleeved on the outside of the support cylinder 1 through threaded connection, and its right end is turned outwards and contacts with the left end surface of the outer wall main part 53, and when the active part 2 is rotated, the active part 2 can pass through the outer wall main part 53 The contact surface gives axial force to the outer wall. The active part 2 is also connected to the stop ring 51 part on the outer wall through the connecting part, when the active part 2 is rotated in the opposite direction, it can give the outer wall a reverse axial force.

The connecting parts include a left connecting part 3 and a right connecting part 4, both of which are cylindrical with one end turned inward. The left end of the left connecting part 3 is turned inward and the end surface after turning is located on the left side of the outward turning part of the active part 2, and the right end of the right connecting part 4 is turned inward and the end surface after turning is located at the side of the outer wall 5. The right side of the retaining ring 51.

When increasing the diameter: as shown in Figure 1, the retaining ring 51 of the left connector 3, the right connector 4, and the outer wall does not work. Rotate the active part 2, the active part 2 moves to the right, and through the plane contact with the left end surface of the outer wall 5, it gives the outer wall 5 a rightward axial force, so that the inclined block 52 on the outer wall moves along the right slope of the inclined hole of the support cylinder 1 Move obliquely upwards, so that the outer wall 5 expands.

When reducing the diameter: as shown in Figure 2, at this time, the active part 2 contacts the left connecting part 3, the left connecting part 3 and the right connecting part 4 are relatively stationary, and the right connecting part 4 contacts the retaining ring 51 of the outer wall. Rotate the active part 2 counterclockwise, the active part 2 moves to the left, and gives the outer wall 5 a leftward axial force, which can drive the inclined block 52 of the outer wall to move obliquely downward along the left inclined surface of the inclined hole 11, so that the outer wall 5 shrinks.

Claims (9)

1. A cylindrical mold with variable outer diameter, characterized in that: comprise a support tube (1), the support tube (1) is provided with an oblique hole (11), and the outer wall (5) is coaxially located on the support tube (1) ) outside, the inner side of the outer wall (5) is provided with an inclined block (52) that cooperates with the inclined hole (11) on the support tube (1); the outer wall (5) is connected to the driving device; When the driving device gives the outer wall (5) a driving force along the axial direction of the support cylinder (1), the inclined block (52) on the outer wall (5) moves along the inclined hole (11) on the support cylinder (1), driving the entire outer wall (5) Simultaneously move along the axial and radial directions of the support cylinder (1) to realize the change of the outer diameter of the outer wall (5). 2. A cylindrical mold with variable outer diameter according to claim 1, characterized in that: said inclined holes (11) are evenly distributed along the circumference of the support cylinder (1) and distributed along the axial direction. 3. A cylindrical mold with variable outer diameter as claimed in claim 1, characterized in that: the main part (53) of the outer wall (5) is made of a mold with the same inner diameter as the outer diameter of the support cylinder (1). The cylindrical barrel is evenly cut along the circumference. 4. A cylindrical mold with variable outer diameter according to claim 1, characterized in that: a retaining ring (51) is provided outside one end of the outer wall (5). 5. A cylindrical mold with variable outer diameter according to claim 4, characterized in that: the retaining ring (51) is formed by dividing circular retaining rings along its circumference. 6. A cylindrical mold with variable outer diameter as claimed in claim 1 or 3, characterized in that: said outer wall (5) is evenly distributed along the circumference of the support cylinder (1), and distributed along the circumference of the support cylinder (1) The number of outer walls (5) is odd and greater than or equal to three. 7. A cylindrical mold with variable outer diameter as claimed in claim 6, characterized in that: the inclined block (52) on the outer wall (5) and the inclined hole (11) on the support cylinder (1) When cooperating with each other, the shape formed by the outer surfaces of the plurality of outer walls (5) is a cylindrical surface. 8. A cylindrical mold with variable outer diameter as claimed in claim 4, characterized in that: the driving device is composed of a driving part (2), a left connecting part (3) and a right connecting part (4); The active part (2) is in the shape of a sleeve, coaxially arranged on the outside of the support cylinder (1) through threaded connection, and the right end of the active part (2) is turned outwards and contacts the left end surface of the outer wall (5); Both the left connecting piece (3) and the right connecting piece (4) are cylindrical with one end turned inward, and the cylindrical surfaces of the two are screwed together; the left end of the left connecting piece (3) is turned inward and turned over. The folded end surface is arranged on the left side of the outwardly turned part of the active part (2), and the right end of the right connecting piece (4) is turned inwardly and the folded end surface is arranged on the retaining ring (51) of the outer wall (5). ) to the right. 9. A cylindrical mold with variable outer diameter as claimed in claim 8, characterized in that: when the diameter is increased, the active part (2) is rotated, and the active part (2) moves to the right, and the outer wall (5) The left end surface is in contact, so that the outer wall (5) moves obliquely upward along the right inclined surface of the inclined hole (11) of the support tube (1), so that the outer wall (5) expands; when the diameter is reduced, the left connecting piece (3) and the right The connecting piece (4) is relatively stationary, the right connecting piece (4) is in contact with the outer wall (5), and the active piece (2) is rotated counterclockwise, and the active piece (2) moves to the left, driving the outer wall (5) along the inclined hole (11) The left slope of the left side moves obliquely downward, thereby making the outer wall (5) shrink.