CN212498627U

CN212498627U - Composite forming polyurethane buffer block

Info

Publication number: CN212498627U
Application number: CN202020499057.1U
Authority: CN
Inventors: 庞建军; 武应涛
Original assignee: Luoyang Kaizhong Shock Absorption Technology Co ltd
Current assignee: Luoyang Kaizhong Shock Absorption Technology Co ltd
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2021-02-09
Anticipated expiration: 2030-04-08

Abstract

The utility model relates to a composite forming's polyurethane buffer block, the buffer block body comprises first density portion and the second density portion that density is different at least, and the buffer block body is revolution solid structure, and the outer peripheral face of first density portion and second density portion all is the corrugate along the axis direction. In the preparation process, polyurethane materials made of different materials are foamed to form the buffer block body and then are compositely connected to form the buffer block body. The utility model discloses simple structure has the buffer block of the different density portion of a plurality of densities, has improved the holistic anti-seismic performance of buffer block, has strengthened elasticity and the rigidity of buffer block in the use, and the range of application is wider.

Description

Composite forming polyurethane buffer block

Technical Field

The utility model relates to a composite forming's polyurethane buffer block belongs to automobile parts technical field.

Background

The polyurethane buffer block has the advantages of good elasticity, large deformation and capability of absorbing larger impact and vibration energy, and is widely applied to the fields of automobile manufacturing and engineering machinery due to the excellent damping performance of the material. The polyurethane buffer block deforms under stress, when the bearing stress changes, the polyurethane buffer block deforms differently along with the change of the stress, and the shape of the polyurethane is restored by the elasticity of the polyurethane after the stress disappears, so that the effect of absorbing vibration can be achieved. In product design, density is an important reference index, for example, when the polyurethane buffer block is used for automobile shock absorption, the polyurethane buffer block can absorb vibration caused by automobile bump, and the driving comfort degree is improved; if the buffer block is low in density, deformation generated during stress is large, more vibration is absorbed, and the comfort level of the vehicle is high. The buffer block which is formed by adopting polyurethane materials with different densities in a composite mode can effectively solve the problem that when the low-density part reaches the deformation limit, the high-density part can continue to generate deformation to absorb the deformation generated by vibration. There are two polyurethane raw materials for the industrial production of the buffer block, one of which is MDI polyurethane, i.e., a high molecular material formed by reacting MDI (diphenylmethane diisocyanate) with a polymeric polyol and a chain extender. Another NDI (1, 5-naphthalene diisocyanate) polyurethane, is a polymeric material formed by reacting NDI with a polymeric polyol and a chain extender. The traditional polyurethane buffer block is of an integrated structure produced by a mold, the density of a buffer block product from the upper part of the structure to the bottom of the structure is consistent, the buffer block with single density cannot meet the strict damping requirement in product design, and the conventional solution in the market is to change the external shape of the product; however, the method for changing the shape has limitations, and cannot meet the performance requirements of large deformation and high bearing capacity, so that a solution for adding a plastic reinforcing ring outside the buffer block is derived, the rigidity of local materials is improved, and other problems are brought while the problem is solved by adding the reinforcing ring, such as increase of process difficulty, difficulty in assembling the reinforcing ring, easiness in causing fracture of the buffer stop block, fracture of the plastic ring and the like.

Disclosure of Invention

The utility model aims at solving the problem that the polyurethane buffer block of traditional integral type structure can not satisfy harsh shock attenuation demand because density is single, has proposed simple structure, designs the compact polyurethane buffer block who has the composite forming of a plurality of different density portions.

The utility model discloses a technical scheme, a compound molding's polyurethane buffer block, including the buffer block body, the buffer block body comprises first density portion and the second density portion that density is different at least.

Furthermore, the buffer block body is of a revolving body structure.

Further, the outer peripheral surfaces of the first and second density portions are each corrugated in the axial direction.

Further, the centers of the first and second density portions are on the same axis.

Furthermore, the first joint surface at one end of the first density part is firmly bonded with the second joint surface at one end of the second density part into a whole through the bonding property of the material.

Furthermore, the first joint surface and the second joint surface are mutually matched flat joint surfaces.

Further, the first density portion and the second density portion are made of MDI type polyurethane or NDI type polyurethane.

Further, the first density portion is constituted by one or more portions having different densities.

Further, the second density portion is constituted by one or more portions having different densities.

The preparation method of the composite molded polyurethane buffer block comprises the following steps:

(1) providing a mold with a polyurethane buffer block forming mold cavity;

(2) placing a density part into a die cavity position corresponding to the density part in a die;

(3) injecting polyurethane material for forming the other density part into the mold cavity corresponding to the other density part, bonding the polyurethane material with the joint surface of the one density part through cohesiveness, and foaming and forming the other density part in the direction opposite to the joint surface of the one density part.

The utility model has the advantages that: (1) the buffer block body comprises a plurality of density parts with different densities, so that the overall anti-seismic performance of the buffer block is improved, the elasticity and the rigidity of the buffer block in the use process are enhanced, and the application range is wider;

(2) the buffer blocks with different densities are made of different polyurethane raw materials, so that the cost of the raw materials is reduced, and different application requirements can be met.

Drawings

Fig. 1 is a schematic structural diagram of the buffer block body of the present invention.

Fig. 2 is a schematic structural view of the first density portion of the present invention.

Fig. 3 is a schematic structural view of the second density portion of the present invention.

Fig. 4 is a schematic diagram of a buffer block obtained by the preparation method of example 1 in the present invention.

Fig. 5 is a schematic diagram of a buffer block obtained by the preparation method of example 2 in the present invention.

Reference numerals: a first density part 1, a second density part 2, a first joint surface 3, a second joint surface 4, an injection mold 5, a runner 6, and a casting mold 7.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1-3, a composite molded polyurethane buffer block comprises a buffer block body, wherein the buffer block body is of a revolving body structure, the buffer block body is at least composed of a first density part 1 and a second density part 2 with different densities, the outer peripheral surfaces of the first density part 1 and the second density part 2 are corrugated along the axis direction, the centers of the first density part 1 and the second density part 2 are on the same axis, a first joint surface 3 is arranged at the bottom of the first density part 1, a second joint surface 4 is arranged at the top end of the second density part 2, and the first joint surface 3 and the second joint surface 4 bond the two density parts into a whole through the bonding property of a polyurethane material.

As can be seen from fig. 4 to 5, the buffer block body according to the present invention may include three or more density portions.

The first embodiment is as follows: the preparation method of the composite molded polyurethane buffer block comprises the following steps:

(1) designing an injection mold 5 having a polyurethane buffer block forming cavity;

(2) and (3) injection molding: placing the first density portion 1 in a cavity of an injection mold 5 with the first engaging surface facing downward;

(3) the polyurethane material is injected to be foamed and molded at the bottom of an injection mold 5 through a pouring gate 6, the foamed polyurethane material is foamed and molded upwards in a cavity of a second density part 2, the foamed polyurethane material is firmly integrated with a first joint surface 3 by the cohesiveness of the material of the foamed polyurethane material to form a second joint surface 4, and the foamed polyurethane material and the first density part 1 form a complete buffer block body, wherein the polyurethane materials adopted by the first density part 1 and the second density part 2 are different, and therefore the obtained split density of the buffer block is different.

Example two: the preparation method of the composite molded polyurethane buffer block comprises the following steps:

(1) designing a casting mold 7 with a polyurethane buffer block forming mold cavity;

(2) molding by a casting method: placing the second density portion 2 in a corresponding position in the cavity of the casting mold 7 with the second joint surface 4 facing upwards;

(3) pouring a polyurethane material into a pouring mold 7 from the upper part of the mold, directly pouring the polyurethane material on a second joint surface 4, upwards foaming the polyurethane material to fill a mold cavity to form a first density part 1, forming a complete buffer block body by the first density part 1 and the second density part 2, wherein the polyurethane material adopted by the first density part 1 and the second density part 2 is different, and the density of the partial body part of the obtained buffer block is different.

The MDI polyurethane buffer block has relatively low raw material cost, the NDI polyurethane is expensive, and the NDI polyurethane is superior to the MDI polyurethane in the aspect of dynamic performance.

Claims

1. The utility model provides a compound molding's polyurethane buffer block, includes the buffer block body, its characterized in that: the buffer block body at least comprises a first density part (1) and a second density part (2) with different densities; the buffer block body is of a revolving body structure; the outer peripheral surfaces of the first density part (1) and the second density part (2) are corrugated along the axial direction; the centers of the first density part (1) and the second density part (2) are on the same axis.

2. The composite molded polyurethane bumper of claim 1, wherein: the first joint surface (3) at one end of the first density part (1) is firmly bonded with the second joint surface (4) at one end of the second density part (2) into a whole through the bonding property of materials.

3. The composite molded polyurethane bumper of claim 2, wherein: the first joint surface (3) and the second joint surface (4) are mutually matched flat joint surfaces.

4. The composite molded polyurethane bumper of claim 1, wherein: the first density part (1) and the second density part (2) are made of MDI polyurethane or NDI polyurethane.

5. The composite molded polyurethane bumper of claim 1, wherein: the first density section (1) is composed of one or more sections having different densities.

6. The composite molded polyurethane bumper of claim 1, wherein: the second density section (2) is composed of one or more sections having different densities.