CN111136158A

CN111136158A - Processing method of blind hole high-turning nut plate

Info

Publication number: CN111136158A
Application number: CN201911332750.8A
Authority: CN
Inventors: 沈士超
Original assignee: Ningbo Iyu Auto Parts Co ltd
Current assignee: Ningbo Iyu Auto Parts Co ltd
Priority date: 2019-12-22
Filing date: 2019-12-22
Publication date: 2020-05-12

Abstract

The invention discloses a method for processing a blind hole high-turning nut plate, which comprises the following steps: firstly, punching a first blind hole with the diameter larger than that of a target blind hole on a plate, wherein the depth of the first blind hole is smaller than that of the first blind hole; secondly, gradually reducing the diameter of the first blind hole and gradually deepening the depth of the first blind hole by repeatedly punching; thirdly, punching the diameter of the first blind hole to be the same as that of the target blind hole, and punching the depth of the first blind hole to be the same as that of the target blind hole; the fourth step; and extruding teeth in the blind hole punched in the third step to form the target blind hole. By adopting the mode, materials required by the blind holes can be taken in the area with the size of the blind holes, but the thickness of the materials can be shared in a larger range according to the principle that the materials are unchanged in stamping processing in the range with any size.

Description

Processing method of blind hole high-turning nut plate

Technical Field

The invention relates to a stamping method, in particular to a method for processing a blind hole high-turnover nut plate.

Background

The press forming is a processing and forming method for obtaining a workpiece (stamping part) with a required shape and size by applying an external force to a plate, a strip, a pipe, a section bar and the like by a press machine and a die to cause plastic deformation or separation. The stamped blanks are mainly hot and cold rolled steel sheets and strips. In the world, 60-70% of steel materials are plates, and most of the plates are punched to form finished products. The body, chassis, oil tank, radiator sheet, boiler steam drum, shell of container, iron core silicon steel sheet of motor and electric appliance are all made by punching. There are also a large number of stamped parts in products such as instruments, household appliances, bicycles, office machines, and household utensils.

One common technique in stamping is to stamp a blind hole, and when the blind hole is stamped, the thickness of the side wall of the blind hole is smaller than the thickness of other positions of the plate. If the blind hole needing to be punched is a nut hole, the blind hole needs to have a certain thickness, so that a high-turned threaded hole cannot be machined for some thin-wall plates.

Disclosure of Invention

The invention provides a processing method of a blind hole high-turning nut plate aiming at the defects in the prior art, and the blind hole high-turning nut plate can be used for punching high-turning threaded holes in a thin-wall plate.

In order to solve the technical problems, the invention is solved by the following technical scheme: a processing method of a blind hole high-turning nut plate comprises the following steps: firstly, punching a first blind hole with the diameter larger than that of a target blind hole on a plate, wherein the depth of the first blind hole is smaller than that of the first blind hole; secondly, gradually reducing the diameter of the first blind hole and gradually deepening the depth of the first blind hole by repeatedly punching; thirdly, punching the diameter of the first blind hole to be the same as that of the target blind hole, and punching the depth of the first blind hole to be the same as that of the target blind hole; the fourth step; and extruding teeth in the blind hole punched in the third step to form the target blind hole. By adopting the mode, materials required by the blind hole can be limited in the area with the size of the blind hole to be taken, but in the range with any size, according to the principle that the materials are unchanged during stamping, the thickness of the materials can be shared in a larger range, and the thickness of the materials can reach the thickness capable of processing threads.

In the above technical solution, preferably, in the fourth step, the outer wall of the target blind hole is a tapered surface with a large top and a small bottom. Such a shape can facilitate die drawing

In the above technical scheme, specifically, in the first step, both the inner hole and the outer wall of the punched first blind hole are tapered, the diameter of the maximum position of the first blind hole is 3 to 5 times of the diameter of the maximum position of the target blind hole, and the depth of the first blind hole is 0.2 to 0.3 of the depth of the target blind hole.

In the former technical solution, preferably, in the second step, after each punching, the diameter of the blind hole does not change by more than 10% and the depth of the blind hole does not change by more than 15% compared with before punching. The small-range transformation can avoid the plate from being cracked during punching. Compared with the prior processing in which the blind hole is only gradually deepened in one direction, the processing mode needs to deepen and punch the diameter of the blind hole to be small, and cracks are easy to appear.

The invention has the beneficial effects that: by adopting the mode, materials required by the blind hole can be limited in the area with the size of the blind hole to be taken, but in the range with any size, according to the principle that the materials are unchanged during stamping, the thickness of the materials can be shared in a larger range, and the thickness of the materials can reach the thickness capable of processing threads.

Detailed Description

The present invention will be described in further detail with reference to specific embodiments below:

a processing method of a blind hole high-turning nut plate comprises the following steps:

firstly, punching a first blind hole with the diameter larger than that of a target blind hole on a plate, wherein the depth of the first blind hole is smaller than that of the first blind hole; the inner hole and the outer wall of the punched first blind hole are conical, the diameter of the maximum position of the first blind hole is 4 times of the diameter of the maximum position of the target blind hole, and the depth of the first blind hole is 0.25 of the depth of the target blind hole.

Secondly, gradually reducing the diameter of the first blind hole and gradually deepening the depth of the first blind hole by repeatedly punching; after each punching, the diameter of the blind hole does not change more than 10% and the depth of the blind hole does not change more than 15% compared with the blind hole before punching. The small-range transformation can avoid the plate from being cracked during punching. Compared with the prior processing in which the blind hole is only gradually deepened in one direction, the processing mode needs to deepen and punch the diameter of the blind hole to be small, and cracks are easy to appear.

Thirdly, punching the diameter of the first blind hole to be the same as that of the target blind hole, and punching the depth of the first blind hole to be the same as that of the target blind hole;

the fourth step; and extruding teeth in the blind hole punched in the third step to form the target blind hole. The outer wall of the target blind hole is a conical surface with a large upper part and a small lower part. The die can be conveniently drawn due to the shape. By adopting the mode, materials required by the blind hole can be limited in the area with the size of the blind hole to be taken, but in the range with any size, according to the principle that the materials are unchanged during stamping, the thickness of the materials can be shared in a larger range, and the thickness of the materials can reach the thickness capable of processing threads.

Claims

1. A processing method of a blind hole high-turning nut plate is characterized by comprising the following steps:

firstly, punching a first blind hole with the diameter larger than that of a target blind hole on a plate, wherein the depth of the first blind hole is smaller than that of the first blind hole;

secondly, gradually reducing the diameter of the first blind hole and gradually deepening the depth of the first blind hole by repeatedly punching;

the fourth step; and extruding teeth in the blind hole punched in the third step to form the target blind hole.

2. The method for processing the blind hole high-turned nut plate as claimed in claim 1, wherein: in the fourth step, the outer wall of the target blind hole is a conical surface with a large upper part and a small lower part.

3. The method for processing the blind hole high-turned nut plate as claimed in claim 1, wherein: in the first step, the inner hole and the outer wall of the punched first blind hole are both conical, the diameter of the maximum position of the first blind hole is 3 to 5 times of the diameter of the maximum position of the target blind hole, and the depth of the first blind hole is 0.2 to 0.3 of the depth of the target blind hole.

4. The method for processing the blind hole high-turned nut plate as claimed in claim 3, wherein: in the second step, after each punching, the diameter of the blind hole does not change more than 10% and the depth of the blind hole does not change more than 15% compared with the blind hole before punching.