Nut hot melting press fitting method

Abstract

The invention discloses a nut hot melting press fitting method. The method comprises the following steps that 1, a plastic press fitting seat is placed on a working plane; 2, the nut is heated through a heating device, and then the heated nut is pressed into the press-fitting base; and 3, after the nut is pressed into the press-fitting base, the nut with the press-fitting base is sleeved with the fixing tool to be fixed, and press-fitting is completed after the whole is cooled. The press-fitting method is suitable for parts with a small number and irregular shapes, the input cost is low, the period is short, and the press-fitting method takes effect quickly.

Description

Technical Field

[0001] The invention relates to the field of nut hot melting, and in particular to a nut hot melting press-fitting method. Background Art

[0002] Ultrasonic crimping is commonly used in the market to press metal nuts into plastics by hot-melting semiconductor plastic parts. However, this method is suitable for large quantities and requires customized crimping molds. It requires long-term testing and verification of parameters, and has a long cost and cycle. Especially for high-melting-point plastics, many ultrasonic crimping devices on the market cannot crimp, and there are too many restrictions on crimping nuts on uneven parts with steps. Therefore, a new technical solution is urgently needed to solve at least one of the above technical problems. Summary of the invention

[0003] The invention aims to provide a nut hot-melt press-fitting method, which is suitable for parts with a small number and irregular shapes, has low investment cost, short cycle and quick effect.

[0004] In order to achieve the above technical objectives and meet the above technical requirements, the technical solution adopted by the present invention is: a nut hot melt press method, characterized in that it includes the following steps: Step 1: Place the plastic press-fit seat on the work plane; Step 2: Use a heating device to heat the nut, and then press the heated nut into the press-fit seat; Step 3: After the nut is pressed into the press-fit seat, insert the nut with the press-fit seat into the fixing tooling for fixation, and complete the press-fitting after the entire body cools down.

[0005] As a preferred technical solution, the nut includes a main body, a head end portion arranged at the upper end of the main body, and a tail end portion arranged at the lower end of the main body, the outer diameter of the head end portion is D, and the outer diameter of the tail end portion is d.

[0006] As a preferred technical solution, the press-fit seat includes a press-fit base plate and a press-fit sleeve fixedly arranged on the upper side of the press-fit base plate, and the press-fit sleeve is provided with a first inner hole and a second inner hole in sequence from top to bottom, the diameter of the first inner hole is C, the diameter of the second inner hole is C1, the depth of the first inner hole is H1, the depth of the second inner hole is H2, C>C1, d=C1.

[0007] As a preferred technical solution, the fixing tool includes a fixing base and a fixing column arranged at the upper end of the fixing base for sleeve-mounting a nut.

[0008] As a preferred technical solution, a glue overflow groove is provided at the upper end of the fixed base.

[0009] As a preferred technical solution, a limiting step is provided at the upper end of the fixed base, the limiting step is coaxially arranged with the fixed column, and the outer diameter of the limiting step is D3, D1<D3<D.

[0010] As a preferred technical solution, the outer diameter of the fixing column is D4, D4<D1<D3.

[0011] As a preferred technical solution, the distance between the upper end of the head end and the tail end is L1, the distance between the head end and the lower side of the main body is L2, and H1=L2.

[0012] As a preferred technical solution, 0.8mm≥DC≥0.6mm, 3mm≥H2-L1≥2.0mm.

[0013] As a preferred technical solution, a first convex ring and a second convex ring are arranged at intervals on the outer circumference of the main body, and a first guide ring and a second guide ring are arranged on the outer circumference of the tail end portion.

[0014] The beneficial effects of the present invention are: 1) The nut will heat-melt the press-fit seat, and then put it on the fixed tooling for cooling. It is suitable for parts with small quantity and irregular shape, with low investment cost, short cycle and quick effect; 2) 3mm ≥ H2-L1 ≥ 2.0mm. After hot melting, residual material will be formed. Prevent the residual material from overflowing into the nut hole and causing thread interference; 3) d=C1, strengthen the tensile strength of the nut after hot melt pressing; 4) The first guide ring and the second guide ring play a guiding role when the nut is pressed in, and the first convex ring and the second convex ring play a reinforcing role after being pressed in to prevent the nut from falling off the press-fit sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional diagram of a press-fit seat and a nut provided by one embodiment of the present invention; Figure 2 It is a three-dimensional diagram of a press-fit seat, a nut and a fixing tool provided in one embodiment of the present invention; Figure 3 is a cross-sectional view of a nut provided by one embodiment of the present invention; Figure 4 is a cross-sectional view of a press-fit seat provided by one embodiment of the present invention; Figure 5 It is a cross-sectional view of a fixing tool provided in one embodiment of the present invention.

[0016] exist Figure 1-Figure 51. Press-fit seat; 101. Press-fit base plate; 102. Press-fit sleeve; 1021. First inner hole; 1022. Second inner hole; 2. Nut; 201. Main body; 202. Head end; 203. Tail end; 204. First convex ring; 205. Second convex ring; 206. First guide ring; 207. Second guide ring; 3. Fixing tool; 301. Fixed base; 3011. Glue overflow groove; 302. Fixed column; 303. Limiting step. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings.

[0018] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "head", "tail", "top", "bottom", "left", "right", "front", "back", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0019] See also Figure 1-Figure 5 One embodiment of the present invention provides a method for hot-melt press-fitting a nut, comprising the following steps: Step 1, placing a press-fit seat 1 made of plastic on a working plane. Specifically, the material of the press-fit seat 1 is PETP, PEEK, or PTFE; Step 2: Use a heating device to heat the nut 2, and then press the heated nut 2 into the press-fit seat 1. The heating temperature is 80-380°C, and the nut 2 is made of metal; Step 3: After the nut 2 is pressed into the press-fit seat 1, the nut 2 with the press-fit seat 1 is inserted into the fixing tool 3 for fixing, and the press-fitting is completed after the whole is cooled.

[0020] The nut 2 heat-melts the press-fit seat 1, and then is put on the fixed tooling 3 for cooling. It is suitable for parts with small quantity and irregular shape, with low investment cost, short cycle and quick effect.

[0021] like Figure 1-Figure 5 As shown, the nut 2 includes a main body 201, a head end 202 arranged at the upper end of the main body 201, and a tail end 203 arranged at the lower end of the main body 201. The outer diameter of the head end 202 is D, and the outer diameter of the tail end 203 is d.

[0022] like Figure 1-Figure 5As shown, the press-fitting seat 1 includes a press-fitting base plate 101, a press-fitting sleeve 102 fixedly arranged on the upper side of the press-fitting base plate 101, and the press-fitting sleeve 102 is provided with a first inner hole 1021 and a second inner hole 1022 in sequence from top to bottom, the diameter of the first inner hole 1021 is C, the diameter of the second inner hole 1022 is C1, the depth of the first inner hole 1021 is H1, the depth of the second inner hole 1022 is H2, the wall thickness of the first inner hole is W, C>C1, d=C1, this size can enhance the tensile strength of the nut 2 after hot-melt pressing, W≥2.0mm, if W is too small, the press-fitting sleeve 102 will be damaged during the press-fitting process and cannot be press-fitted.

[0023] like Figure 1-Figure 5 As shown, the fixing tool 3 includes a fixing base 301, a fixing column 302 arranged at the upper end of the fixing base 301 for sleeve-mounting the nut 2, and a glue overflow groove 3011 is arranged at the upper end of the fixing base 301. After hot melting, the press-fitting seat 1 will produce glue overflow, and the overflow glue enters the glue overflow groove 3011 to prevent the overflow glue from affecting the size of the press-fitting sleeve 102 after cooling.

[0024] like Figure 1-Figure 5 As shown, a limiting step 303 is provided on the upper end of the fixed base 301, and the limiting step 303 is coaxially arranged with the fixed column 302. The outer diameter of the limiting step 303 is D3, D1<D3<D, and the nut 2 after hot melting is put on the fixed column 302. Since D3<D, the limiting step 303 and the nut 2 are abutted, and the upper end surface of the nut 2 after hot melting is 0.1mm-0.2mm lower than the upper end surface of the press-fitting sleeve 102. After the plastic is melted, it is similar to an elastomer, which causes the nut 2 to rebound after being pressed in, resulting in inaccurate press-fitting. The function of the limiting step 303 is to keep the nut 2 in a fixed position after being pressed in until solidification, so as to avoid inaccurate press-fitting position of the nut 2 due to rebound. The height of the limiting step is H, 0.1mm<H<0.2mm.

[0025] like Figure 1-Figure 5 As shown, the outer diameter of the fixing column 302 is D4, D4<D1<D3, and D4 is smaller than D1 to facilitate the nut 2 to be put on the fixing column 302.

[0026] like Figure 1-Figure 5 As shown, the distance between the upper end of the head end 202 and the tail end 203 is L1, and the distance between the head end 202 and the lower side of the main body 201 is L2, H1=L2, so that the first inner hole 1021 accommodates the head end 202 and the main body 201.

[0027] like Figure 1-Figure 5As shown, 0.8mm≥DC≥0.6mm, 3mm≥H2-L1≥2.0mm, D should be larger than C so that it can better bond with the press-fitting sleeve 102 during hot-melt press-fitting, but it should not be larger than 0.8mm, otherwise the nut 2 cannot be completely pressed into the press-fitting sleeve 102, and residual material will be formed after hot-melt. It is prevented that the residual material overflows into the hole of the fixed nut 2 and causes thread interference.

[0028] like Figure 1-Figure 5 As shown, the first convex ring 204 and the second convex ring 205 are arranged at intervals on the outer peripheral side of the main body 201, and the first guide ring 206 and the second guide ring 207 are arranged on the outer peripheral side of the tail end portion 203. The first guide ring 206 and the second guide ring 207 play a guiding role when the nut 2 is pressed in, and the first convex ring 204 and the second convex ring 205 play a reinforcing role after being pressed in to prevent the nut 2 from falling off from the press-fitting sleeve 102.

[0029] The outer circumference of the first convex ring 204 and the second convex ring 205 is provided with anti-skid patterns, so that the bonding effect is better after press-fitting, and the nut 2 is not easy to fall off.

[0030] The above embodiments are merely descriptions for the purpose of clearly illustrating the present invention, and are not limitations on the implementation methods. For those skilled in the art, other different forms of changes or modifications may be made based on the above descriptions. It is not necessary and impossible to enumerate all the implementation methods here, and the obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A method for hot-melt press-fitting of nuts, characterized in that , including the following steps: Step 1: Place the plastic press-fit seat on the work plane; Step 2: Use a heating device to heat the nut, and then press the heated nut into the press-fit seat; Step 3: After the nut is pressed into the press-fit seat, insert the nut with the press-fit seat into the fixing tooling for fixation, and complete the press-fitting after the entire body cools down.

2. The nut hot melt press-fitting method according to claim 1, characterized in that: The nut includes a main body, a head end portion arranged at the head end of the main body, and a tail end portion arranged at the tail end of the main body. The outer diameter of the head end portion is D, and the outer diameter of the tail end portion is d.

3. The nut hot melt press-fitting method according to claim 2, characterized in that: The press-fit seat includes a press-fit base plate and a press-fit sleeve fixedly arranged on the upper side of the press-fit base plate. The press-fit sleeve is provided with a first inner hole and a second inner hole in sequence from top to bottom. The diameter of the first inner hole is C, the diameter of the second inner hole is C1, the depth of the first inner hole is H1, the depth of the second inner hole is H2, and the hole wall thickness of the first inner hole is W.

4. The nut hot melt press-fitting method according to claim 3, characterized in that: The fixing tool comprises a fixing base, a fixing column arranged at the upper end of the fixing base and used for sleeve-mounting a nut, and a glue overflow groove is arranged at the upper end of the fixing base.

5. The nut hot melt press-fitting method according to claim 4, characterized in that: W≥2.0mm, C>C1, d=C1.

6. The nut hot-melt press-fitting method according to claim 5, characterized in that: A limiting step is arranged at the upper end of the fixed base, and the limiting step is arranged coaxially with the fixed column. The outer diameter of the limiting step is D3, and D1<D3<D.

7. The nut hot-melt press-fitting method according to claim 6, characterized in that: The outer diameter of the fixing column is D4, and D4<D1<D3.

8. The nut hot-melt press-fitting method according to claim 7, characterized in that: The distance between the upper end of the head end portion and the tail end portion is L1, and the distance between the head end portion and the lower side of the main body portion is L2, H1=L2.

9. The nut hot-melt press-fitting method according to claim 8, characterized in that: 0.8mm≥DC≥0.6mm, 3.0mm≥H2-L1≥2.0mm.

10. The nut hot-melt press-fitting method according to claim 1, characterized in that: A first convex ring and a second convex ring are arranged at intervals on the outer circumference of the main body, and a first guide ring and a second guide ring are arranged on the outer circumference of the tail end portion.

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