CN102554587A - Internal thread machining improved process - Google Patents

Abstract

The invention discloses an internal thread machining improved process, which specifically comprises the following steps of: performing drawing pretreatment: drawing for a set depth at a place, where internal thread is required to be machined, on a plate to be machined; pre-punching a hole: punching a coaxial pre-punched hole at the drawing position; sprouting: sprouting on the pre-punched hole to form a columnar through hole without internal thread by using a punch; and finally tapping: tapping thread in the sprouted columnar through hole to form a threaded hole by using a thread tap. According to the internal thread machining improved process, by increasing a one-step drawing process, a material deforms through two drawing processes to reach the required flanging height, so that stress concentration of the material can be greatly reduced, the situation of serious crack at the thread can be effectively improved, the product quality is improved, the reject rate is reduced, the cost is saved, and a product is safer and more reliable in use.

Description

The internal thread machining improved process

Technical field

The present invention relates to a kind of Thread Machining Process, particularly a kind of internal thread machining improved process of sheet material.

Background technology

At present, in the internal thread processing technique that sheet material is used always, its step is generally: pre-punched hole, flange, tapping, its shortcoming are screw thread place severe crack, influence crudy, make product rejection rate big.

Summary of the invention

In order to overcome above-mentioned defective, the invention provides a kind of internal thread machining improved process, use this internal thread machining improved process can effectively improve the situation of screw thread place severe crack, improve the quality of products, reduce cost.

The present invention for the technical scheme that solves its technical problem and adopt is: a kind of internal thread machining improved process, and concrete steps are following:

Step 1: stretching preliminary treatment: on the sheet material of generation processing, need the degree of depth of the place stretching setting of machining internal thread, sheet material stretcher strain just forms a pit in the place that is needing machining internal thread like this;

Step 2: pre-punched hole: form a coaxial pre-punched hole in the stretch position punching press;

Step 3: sprout: with drift on pre-punched hole, sprout (being flange, the further stretcher strain of material) form the column through hole of a no internal thread;

Step 4: tapping: form screwed hole with carrying out tapping in the column through hole of screw tap after sprouting.

Through above step, material is through twice stretcher strain, and the stress of material internal is concentrated smaller, and wall thickness is thicker, is not easy to occur situation such as crack fracture, uses safety and stability.

The invention has the beneficial effects as follows: the present invention is through increasing once step stretching technology; Material is met the requirements of the flange height through twice stretcher strain, can reduce the stress of material greatly and concentrate, can effectively improve the situation of screw thread place severe crack; Improve the quality of products; Reduce scrappage, save cost, product is also safety and reliability in use.

Description of drawings

The diel structural representation of Fig. 1 for using among the present invention.

Accompanying drawing is made following supplementary notes

A-stretching pretreatment process, B-pre-punched hole operation, the C-operation of sprouting

The specific embodiment

Embodiment: a kind of internal thread machining improved process, concrete steps are following:

Step 1: stretching preliminary treatment A: on the sheet material of generation processing, need the degree of depth of the place stretching setting of machining internal thread, sheet material stretcher strain just forms a pit in the place that is needing machining internal thread like this;

Step 2: pre-punched hole B: form a coaxial pre-punched hole in the stretch position punching press;

Step 3: C sprouts: with drift on pre-punched hole, sprout (being flange, the further stretcher strain of material) form the column through hole of a no internal thread;

Step 4: tapping: form screwed hole with carrying out tapping in the column through hole of screw tap after sprouting.

Through above step, material is through twice stretcher strain, and the stress of material internal is concentrated smaller, and wall thickness is thicker, is not easy to occur situation such as crack fracture, uses safety and stability.

Claims (1)

1. internal thread machining improved process, it is characterized in that: concrete steps are following:

Step 1: stretching preliminary treatment: the degree of depth that on the sheet material of generation processing, needs the place stretching setting of machining internal thread;

Step 2: pre-punched hole: form a coaxial pre-punched hole in the stretch position punching press;

Step 3: sprout: sprouting on pre-punched hole with drift forms the column through hole of a no internal thread;

Step 4: tapping: form screwed hole with carrying out tapping in the column through hole of screw tap after sprouting.