阅读说明：本技术 一种非均匀刚度握把握柄结构及制造方法 (Non-uniform rigidity handle structure and manufacturing method ) 是由 李宏伟 韩奇 桂蓁蓉 张创亮 于 2021-06-25 设计创作，主要内容包括：一种非均匀刚度握把握柄结构及制造方法,包括外壳、内筒和填充结构；内筒同轴设置在外壳内部,填充结构固定设置在外壳和内筒之间；内筒内部用于固定设置螺丝刀。步骤1,确定握把握柄的造型及尺寸,包括直径D、形状、厚度h；步骤2,构筑握把握柄的外壳结构；步骤3,构筑握把握柄中与手部接触部分的泡沫结构或胞元填充结构；步骤4,选取材料,通过3D打印设备制备非均匀刚度握把握柄。本发明根据手掌大小涉及握把握柄形状大小,在与手接触的地方利用TPU材料和3D打印技术制备非均匀刚度握把握柄,利用泡沫结构或者胞元填充结构提高握把握柄握持舒适度。(A non-uniform rigidity handle structure and a manufacturing method thereof comprise a shell, an inner cylinder and a filling structure; the inner cylinder is coaxially arranged inside the shell, and the filling structure is fixedly arranged between the shell and the inner cylinder; the inner cylinder is used for fixedly arranging a screwdriver. Step 1, determining the shape and size of a grip handle, including the diameter D, the shape and the thickness h; step 2, constructing a shell structure of the grip handle; step 3, constructing a foam structure or a cell filling structure of a part, which is in contact with the hand, in the grip handle; and 4, selecting materials, and preparing the non-uniform-rigidity grip handle through 3D printing equipment. The invention relates to the shape and the size of a grip handle according to the size of a palm, the grip handle with non-uniform rigidity is prepared by utilizing TPU (thermoplastic polyurethane) materials and a 3D (three-dimensional) printing technology at a position contacted with a hand, and the gripping comfort of the grip handle is improved by utilizing a foam structure or a cellular element filling structure.)

1. A grip structure with non-uniform rigidity is characterized by comprising a shell (1), an inner cylinder (2) and a filling structure (3); the inner cylinder (2) is coaxially arranged in the shell (1), and the filling structure (3) is fixedly arranged between the shell (1) and the inner cylinder (2); the inner cylinder (2) is internally used for fixedly arranging a screwdriver.

2. The non-uniform stiffness grip handle structure of claim 1, wherein the filler structure (3) is a foam structure or a cellular filler structure.

3. A method of manufacturing a non-uniform stiffness grip handle structure, based on any one of claims 1 to 2, comprising the steps of:

step 1, determining the shape and size of a grip handle, including the diameter D, the shape and the thickness h;

step 2, constructing a shell structure of the grip handle;

step 3, constructing a foam structure or a cell filling structure of a part, which is in contact with the hand, in the grip handle;

and 4, selecting materials, and preparing the non-uniform-rigidity grip handle through 3D printing equipment.

4. The method of claim 3, wherein step 1 comprises:

1) determining the diameter D of a grip handle of the grip according to the size of a hand of a person, wherein the grip handle is circular and has a thickness h;

2) modeling the grip handle in Solidworks or Rhinoceros CAD modeling software, and setting the diameter D, the shape and the thickness h.

5. The method of claim 3, wherein step 2 comprises:

1) selecting the part of the grip handle in contact with the hand from Solidworks or Rhinoceros CAD modeling software;

2) dividing the part of the grip handle contacting with the hand from other parts;

3) inwards offsetting the part of the grip handle, which is in contact with the hand, by 1mm to obtain a shell structure of the grip handle;

4) and outputting the model in STP format.

6. The method of claim 3, wherein the step of constructing the handle with the foam structure in step 3 comprises:

1) importing the STP model obtained in the step 2 into Rhinoceros CAD modeling software;

2) writing a foam structure in a Grasshopper which is an insert of a Rhinoceros CAD modeling software;

3) selecting a point P at the top of a grab handle of the grip as the circle center of the foam structure, and setting the diameter of the ball structure in the foam to be 2 mm;

3) arraying the balls along the x direction until the diameter of a grip handle, setting the distance between the centers of the balls in the x direction to be 3.0-4.0mm, and setting the number of the balls in the x direction to be 8-12;

5) changing the diameter of the ball in the x direction from the circle center to the periphery from large to small, setting the diameter of the smallest sphere center to be 0.2mm, and setting the diameter of the largest sphere center to be 0.5 mm;

6) circumferentially arraying a row of balls in the x direction obtained in the step 5) around a point P in an xy plane, and setting the number of arrays to be 30-35;

7) setting the number of the xy plane balls obtained in the step 6) to be 5-7 in a z-direction array, wherein the distance in the z direction is 3.00 mm;

8) performing Boolean difference set operation on the ball obtained in the step 7) and the interior of the grip handle to obtain a foam structure of a part of the grip handle, which is in contact with the hand;

9) and outputting the model in the format of STL.

7. The method of claim 3, wherein the step of constructing the grip handle with the cell filled structure in step 3 comprises:

1) importing the STP model obtained in the step 2 into Rhinoceros CAD modeling software;

2) writing a unit cell structure in a Grasshopper which is an insert of a Rhinoceros CAD modeling software;

3) selecting the surface of an inner diameter structure and an outer diameter structure of the grip handle model as a cell structure filling area F;

4) designing a unit cell structure, and setting the diameter of a supporting structure in the unit cell structure to be 1 mm;

5) filling the cell structures into the area F, and arraying the cell structures along the x direction to the diameter of the grip handle by taking the cross sectional view of the grip handle as a standard, wherein the number of the arrays in the x direction is set to be 3-5;

6) the three-dimensional size of the unit cell can be automatically changed and adapted according to the thickness h and the array quantity set in the x-axis direction;

7) selecting a central point P of the cross section of the grab handle of the grip;

8) circumferentially arraying a row of unit cell structures in the x direction obtained in the step 5) around a point P in an xy plane, and setting the number of arrays to be 12-16;

9) arraying the xy plane unit cell structures obtained in the step 8) in the z direction, wherein the number is set to be 30, and the distance in the z direction is 3.00 mm;

10) performing Boolean union operation on the cell structure obtained in the step 9) and the interior of the grip handle to obtain the integral structure of the grip handle;

and outputting the model in the format of STL.

8. The method of claim 3, wherein the selected material is TPU, and the non-uniform stiffness grip handle model obtained in step 3 is printed and formed by a laser sintering (SLS) process or a Fused Deposition Modeling (FDM) process to obtain a non-uniform stiffness grip handle.

Technical Field

The invention belongs to the technical field of design of a man-machine grip handle, and particularly relates to a grip handle structure with non-uniform rigidity and a manufacturing method thereof.

Background

The tool is an extension of human limbs, the use of the tool increases the action range and strength of human beings, and the working efficiency is improved. In our lives, there are large and small tools, thousands of tools, in the use process of the tools, in order to make the tools well utilized by people, not only can the tools exert their functions to the maximum extent, but also the users feel comfortable when using the tools, the design of the grip handle on the tools is very important, the tools and the users are connected through the grip handle, the well designed grip handle not only can make the tools exert their functions to the maximum extent, but also can make the users less hurt the tools to the people, in order to make the users safely use the products, in the product design process, human factors have been added to the product design as a technology.

The hands of human beings can do complex and skillful actions of pinching, holding, grabbing, clamping, lifting and the like, have extremely fine feelings, and the complex functions are closely related to the anatomical structures of the human beings. When the hand is contacted with the grip handle, the grip handle can give certain stimulation to the hand, and the receptors of the hand can generate nerve impulse after sensing the stimulation, and the nerve impulse is conducted to the central system of the brain by sensory nerves, and certain physiological and psychological reactions are generated after analysis. The size, shape, texture, material and the like of the holding handle directly influence the working habit and the working efficiency of people.

The material is same even rigidity almost in present handle design, can add in some handle designs and have elasticity TPU material as surface texture, increases the hand comfort level. In order to maintain the function and shape of the handle, the grip handle made of the same material is generally hard in texture, certain pressure is applied to fingers, muscles and neurons of the fingers are complex and sensitive, and discomfort of the fingers can be caused when the grip handle is used under long-term pressure, so that the working efficiency is reduced.

Disclosure of Invention

The present invention is directed to a grip structure with non-uniform stiffness and a method for manufacturing the same to solve the above-mentioned problems.

In order to achieve the purpose, the invention adopts the following technical scheme:

a non-uniform rigidity handle structure comprises a shell, an inner cylinder and a filling structure; the inner cylinder is coaxially arranged inside the shell, and the filling structure is fixedly arranged between the shell and the inner cylinder; the inner cylinder is used for fixedly arranging a screwdriver.

Further, the filling structure is a foam structure or a cellular filling structure.

Further, a manufacturing method of the grip handle structure with non-uniform rigidity comprises the following steps:

step 1, determining the shape and size of a grip handle, including the diameter D, the shape and the thickness h;

step 2, constructing a shell structure of the grip handle;

step 3, constructing a foam structure or a cell filling structure of a part, which is in contact with the hand, in the grip handle;

and 4, selecting materials, and preparing the non-uniform-rigidity grip handle through 3D printing equipment.

Further, the step 1 specifically includes:

1) determining the diameter D of a grip handle of the grip according to the size of a hand of a person, wherein the grip handle is circular and has a thickness h;

2) modeling the grip handle in Solidworks or Rhinoceros CAD modeling software, and setting the diameter D, the shape and the thickness h.

Further, the step 2 specifically includes:

1) selecting the part of the grip handle in contact with the hand from Solidworks or Rhinoceros CAD modeling software;

2) dividing the part of the grip handle contacting with the hand from other parts;

3) inwards offsetting the part of the grip handle, which is in contact with the hand, by 1mm to obtain a shell structure of the grip handle;

4) and outputting the model in STP format.

Further, the step of constructing the handle of the foam structure handle in the step 3 specifically comprises the following steps:

1) importing the STP model obtained in the step 2 into Rhinoceros CAD modeling software;

2) writing a foam structure in a Grasshopper which is an insert of a Rhinoceros CAD modeling software;

3) selecting a point P at the top of a grab handle of the grip as the circle center of the foam structure, and setting the diameter of the ball structure in the foam to be 2 mm;

3) arraying the balls along the x direction until the diameter of a grip handle, setting the distance between the centers of the balls in the x direction to be 3.0-4.0mm, and setting the number of the balls in the x direction to be 8-12;

5) changing the diameter of the ball in the x direction from the circle center to the periphery from large to small, setting the diameter of the smallest sphere center to be 0.2mm, and setting the diameter of the largest sphere center to be 0.5 mm;

6) circumferentially arraying a row of balls in the x direction obtained in the step 5) around a point P in an xy plane, and setting the number of arrays to be 30-35;

7) setting the number of the xy plane balls obtained in the step 6) to be 5-7 in a z-direction array, wherein the distance in the z direction is 3.00 mm;

8) performing Boolean difference set operation on the ball obtained in the step 7) and the interior of the grip handle to obtain a foam structure of a part of the grip handle, which is in contact with the hand;

9) and outputting the model in the format of STL.

Further, the step 3 of constructing the grip of the cell filling structure comprises the following steps:

1) importing the STP model obtained in the step 2 into Rhinoceros CAD modeling software;

2) writing a unit cell structure in a Grasshopper which is an insert of a Rhinoceros CAD modeling software;

3) selecting the surface of an inner diameter structure and an outer diameter structure of the grip handle model as a cell structure filling area F;

4) designing a unit cell structure, and setting the diameter of a supporting structure in the unit cell structure to be 1 mm;

5) filling the cell structures into the area F, and arraying the cell structures along the x direction to the diameter of the grip handle by taking the cross sectional view of the grip handle as a standard, wherein the number of the arrays in the x direction is set to be 3-5;

6) the three-dimensional size of the unit cell can be automatically changed and adapted according to the thickness h and the array quantity set in the x-axis direction;

7) selecting a central point P of the cross section of the grab handle of the grip;

8) circumferentially arraying a row of unit cell structures in the x direction obtained in the step 5) around a point P in an xy plane, and setting the number of arrays to be 12-16;

9) arraying the xy plane unit cell structures obtained in the step 8) in the z direction, wherein the number is set to be 30, and the distance in the z direction is 3.00 mm;

10) performing Boolean union operation on the cell structure obtained in the step 9) and the interior of the grip handle to obtain the integral structure of the grip handle;

and outputting the model in the format of STL.

Further, the selected material is a TPU material, and the non-uniform rigidity grip handle model obtained in the step 3 is printed and formed by a laser sintering SLS process or an FDM process to obtain the non-uniform rigidity grip handle.

Compared with the prior art, the invention has the following technical effects:

the invention relates to the shape and the size of a grip handle according to the size of a palm, the grip handle with non-uniform rigidity is prepared by utilizing TPU (thermoplastic polyurethane) materials and a 3D (three-dimensional) printing technology at a position contacted with a hand, and the gripping comfort of the grip handle is improved by utilizing a foam structure or a cellular element filling structure. Handgrip grips filled with foam structures or cells have a higher modulus of elasticity than handgrip grips with evenly distributed material. For the grip product, the structure is a cylinder, when the cell array is converted into the coaxial annular surface from the array between two parallel planes, the filling rate of the structure can be spontaneously changed, the originally uniform filling rate is changed into the radial outward decreasing rate, the filling form is automatically converted into the cell array with the gradient size from the regular cell array, and compared with the prior art, the gradient rigidity with the size from inside to outside can be formed. In the foam structure, the hollow foam close to the center of the handle is small in volume, and the hollow foam close to the edge of the handle at the outer side is large in volume, so that the gradient rigidity from inside to outside can be formed.

Drawings

Fig. 1 is a schematic view of the shape of the handle of the present invention.

FIG. 2 is a schematic view of the grip size of the present invention.

FIG. 3 is a schematic view of the structure of the handle housing of the present invention.

Fig. 4 is a schematic drawing of the handle foam structure of the present invention, written in Grasshopper.

Fig. 5 is a schematic view of the grip foam structure of the present invention (from above).

Fig. 6 is a schematic view of the grip structure (front view) of the present invention.

FIG. 7 is a schematic view of the shape of the grip of the present invention.

FIG. 8 is a schematic view of the grip of the present invention.

FIG. 9 is a schematic view of the grip shell structure of the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

example 1:

a design and preparation method of a grip (rotary handle) with non-uniform rigidity comprises the following steps:

step 1, determining the shape and size of a grip handle (a rotary handle), including the diameter D, the shape and the thickness h;

step 2, constructing a shell structure of a grip handle (a rotary handle);

step 3, constructing a foam structure of a part of the grip handle (a rotary handle) which is in contact with the hand;

and 4, selecting materials, and preparing a non-uniform-rigidity grip handle (a rotary handle) through the materials and 3D printing equipment.

Further, the step 1 specifically includes:

according to the size of the human hand being about 62-82mm, the diameter D of a handle (a rotary handle) of the grip is determined to be 75mm, the shape is circular, the thickness h is 17mm, and the attached figure 2 is shown in the specification;

modeling of a grip handle (a rotary handle) is carried out in Solidworks modeling software, and the diameter D and the thickness h are set, and are shown in the attached drawing 1.

Further, the step 2 specifically includes:

selecting a part of a grip handle in contact with a hand in Solidworks modeling software;

dividing the part of the grip handle contacting with the hand from other parts;

the part of the grip handle contacting with the hand is shifted inwards by 1mm to obtain the shell structure of the grip handle (rotary handle);

the output model, formatted as STP, fig. 3.

Further, step 3 specifically includes:

importing the STP model obtained in the step 2 into Rhinoceros CAD modeling software;

the foam structure is written in the insert Grasshopper of the rhinoceros cad modeling software, gh, fig. 4;

selecting a point P at the top of a grab handle of the grip as the circle center of the foam structure, and setting the diameter of the ball structure in the foam to be 2 mm;

arraying the balls along the x direction until the diameter of a grip handle, setting the distance between the centers of the balls in the x direction to be 3.5mm, and setting the number of the balls in the x direction to be 11;

changing the diameter of the ball in the x direction from the circle center to the periphery from large to small, setting the diameter of the smallest sphere center to be 0.2mm, and setting the diameter of the largest sphere center to be 0.5 mm;

circumferentially arraying a row of balls in the x direction obtained in the step 5) around a point P in an xy plane, and setting the number of the arrays to be 32;

arranging the xy plane balls obtained in the step 6) in an array in the z direction, wherein the set number is 6, and the distance in the z direction is 3.00 mm;

performing Boolean difference set operation on the ball obtained in step 7) and the interior of the grip handle to obtain a foam structure of a part of the grip handle (a rotary handle) which is in contact with the hand;

the output model is in STL format, and is shown in figures 5 and 6.

Further, in the step 4, the selected material can be a TPU material, and the uneven-rigidity rotating handle model obtained in the step 3 is printed and formed by an FDM process to obtain an uneven-rigidity rotating handle.

Detailed description of the embodiments of the grip handle

The invention is further described below with reference to the accompanying drawings:

example 2:

a design and preparation method of a grip with non-uniform rigidity comprises the following steps:

step 1, determining the shape and size of a grip handle, including an outer diameter D, an inner diameter D, a shape and a thickness h;

step 2, constructing a shell structure of the grip handle;

step 3, constructing a cell structure of a contact part of the grip handle and the hand;

and 4, selecting materials, and preparing the non-uniform-rigidity grip handle through 3D printing equipment.

Further, the step 1 specifically includes:

according to the size of the human hand being about 62-82mm, the outer diameter D of the grip handle of the grip is determined to be about 35-40mm, the inner diameter D is 10-20mm, the shape is circular, and the thickness h is determined to be about 10-15mm, as shown in figure 2;

modeling the grip handle in Solidworks or Rhinoceros CAD modeling software, and setting the outer diameter D, the inner diameter D, the shape and the thickness h as shown in figure 1.

Further, the step 2 specifically includes:

selecting a part of a grip handle in contact with a hand in Solidworks modeling software;

dividing the part of the grip handle contacting with the hand from other parts;

inwards offsetting the part of the grip handle, which is in contact with the hand, by 1mm to form a solid body, so as to obtain a shell structure of the outer diameter of the grip handle;

the output model, formatted as STP, fig. 3.

Further, step 3 specifically includes:

importing the STP model obtained in the step 2 into Rhinoceros CAD modeling software;

writing a unit cell structure in a Grasshopper plug-in of the Rhinoceros CAD modeling software, gh, attached figure 4;

selecting the surface of an inner diameter structure and an outer diameter structure of the grip handle model as a cell structure filling area F;

designing a unit cell structure, and setting the diameter of a supporting structure in the unit cell structure to be 1 mm;

filling the cell structures into the area F, and arraying the cell structures along the x direction to the diameter of the grip handle by taking the cross sectional view of the grip handle as a standard, wherein the number of the arrays in the x direction is set to be 3-5;

the three-dimensional size of the unit cell can be automatically changed and adapted according to the thickness h and the array quantity set in the x-axis direction;

selecting a central point P of the cross section of the grab handle of the grip;

circumferentially arraying a row of unit cell structures in the x direction obtained in the step 5) around a point P in an xy plane, and setting the number of arrays to be 12-16;

arraying the xy plane unit cell structures obtained in the step 8) in the z direction, wherein the number is set to be 30, and the distance in the z direction is 3.00 mm;

performing Boolean union operation on the cell structure obtained in the step 9) and the interior of the grip handle to obtain the integral structure of the grip handle;

and outputting the model in the format of STL.

Further, in the step 4, the selected material may be a TPU material, the non-uniform rigidity grip handle model obtained in the step 3 is printed and molded by using a laser sintering SLS process to obtain a non-uniform rigidity grip handle, and the attached drawings 5 and 6 show that the handle model is made of the TPU.

Further, in the step 4, the selected material can be a TPU material, and the non-uniform rigidity grip handle model obtained in the step 3 is printed and formed by an FDM process to obtain the non-uniform rigidity grip handle.