WO2017123081A1

WO2017123081A1 - Device for forming internal grooves in a body

Info

Publication number: WO2017123081A1
Application number: PCT/MX2016/000001
Authority: WO
Inventors: José Eduardo FARFÁN FAUDON
Original assignee: Thyssenkrupp Presta De Mexico S.A. De C.V.
Priority date: 2016-01-15
Filing date: 2016-01-15
Publication date: 2017-07-20
Also published as: MX2016000607A

Abstract

The invention relates to a device for forming internal grooves in a body, which permits the grooves or toothing of the parts or bodies to be made both in bodies that are closed at the bottom and in bodies that are open at the bottom. The device comprises, inter alia: an upper spacer (1); an intermediate spacer (2); a sleeve (3) configured for accommodating and controlling the sliding of a punch (6); a centring means (10) having an ejection path (17) and positioned below the punch (6); a block (9) joined to the centring means (10) having spacers (11, 14) inside; a lower punch (16); and a lower spacer (12) configured such that an ejector (13) passes through same, which is joined below the block (9).

Description

APPARATUS FOR FORMING INTERNAL SLOTS IN A BODY

FIELD OF THE INVENTION

The present invention relates to the technical field of mechanics and more specifically to metalworking, because it describes an apparatus for forming internal grooves in a body.

BACKGROUND OF THE INVENTION

It is called a narrow and long channel groove that opens in a body or piece of wood, stone or other material, to make an assembly, guide a movable piece, to allow the passage for air, coins, papers, small objects, Among other applications.

One of the processes used to make grooves in different parts, is known by the name of "broaching", which is a process of machining by chip removal whose tool is called brush, which is shaped like a bar and its surface It is provided with multiple teeth. The broaching operation consists in passing the brush, forcedly, through a cylindrical hole or through the outer surface of the piece, in order to gradually obtain the profile of the brush used. It is the operation that consists of linearly and progressively tearing off the chip from the surface of a body through an orderly succession of cutting edges.

The main features of broaching are:

· Each tooth removes material progressively, to create the final shape.

• All operations (roughing, semi-finishing, finishing) are performed in a single pass. Especially recommended for long series, it is an alternative technology to milling, drilling, turning, grinding.

The surface to be brushed must be parallel to the direction of the tooth movement.

The process is extremely precise, this performance demonstrated in large productions is not matched by any other process.

Broaching is especially suitable for automotive companies where a high level of precision and performance are required.

The main advantages of broaching are:

• Reduced cycle times: the pieces are produced in a single pass (generally require less than a minute), with other machining processes multiple operations are required to create complex and / or irregular shapes.

• Excellent precision and repetitive process.

• Linear displacement means a small number of process variables.

• Better finishing surfaces, a fine quality is achieved only in one pass.

• The last tooth ends and polishes the piece.

• Long tool life: each tooth of the brush is in contact with the surface of the material only once per cycle.

• A brush can produce a large number of parts before it needs to be sharpened again.

• Simplified training and maintenance: a brushing machine is not complex. In addition, the loading and unloading of parts is easily automatable.

• Extremely competitive process in costs: for high productivity, large batches of parts can be brushed in a single pass. Performing a state-of-the-art search, some patents related to slitting devices were found, such as patent application US5906127 (A), with the title 'Method and apparatus for forming a toothed ring', published on May 25, 1999 , of the MAZDA MOTOR applicant, in said document an apparatus for forming a toothed ring is described which comprises forming: a frame; mounting means, supported for rotation by said frame, for mounting a half-finished annular element so that have a smaller and more rotating internal diameter; an externally ribbed mandrel, supported by axial movement of the frame, which has an external diameter at the tip, which additionally engages with the toothed ring; drive means, fixed to said frame , to axially drive the externally grooved mandrel in said half-finished annular element; and forming the grooves by a plurality of press rollers a, with the support of the frame, to radially press the half-finished annular element against the mandrel externally. It also comprises a cylindrical core rod that has an external diameter smaller than the diameter of the internal tip that is axially inserted into an annular element mounted on the mounting means.

The patent application of US3915059 (A), published on October 28, 1975, also describes a cutter with a conical shape having a cutting edge and an exit edge; a plurality of teeth are defined on the periphery of the cutter at the cutting edge, each having a free space at the cutting edge and behind the cutting edge. The cutter is supported by a blade shaft that is freely supported for rotation in a blade housing by a plurality of bearings. The blade housing is adapted for mounting on a conventional composite slide of a lathe in such a way that to arrange the blade axis in relation angular with the work that is rotatably supported by a lathe plate. The cutter can rotate freely, it is advanced in the work of rotation by the screw of advance of the lathe to cut longitudinal grooves or external or internal in the work.

However, in none of the aforementioned documents or those that are the most relevant or in others, it is evident that the teeth of the pieces or bodies can be done both with closed and open bottoms, without the need to make major changes in the structure of The devices do not solve the problem that the pieces that pass through this process have longitudinal marks. Given the need to have an apparatus for forming grooves, which solves the inconveniences of existing equipment, it was that the present invention was developed.

OBJECT OF THE INVENTION

The present invention aims to make available an apparatus for forming internal grooves in a body, regardless of whether it is closed or open bottom and without leaving longitudinal marks on the parts.

BRIEF DESCRIPTION OF THE FIGURES

The characteristic details of this novel apparatus for forming internal grooves in a body, are clearly shown in the following description and in the accompanying figures, as well as an illustration thereof, and following the same reference signs to indicate the parts shown. However, said figures are shown by way of example and should not be considered as limiting for the present invention. Figure 1 shows a longitudinal section of the apparatus for forming internal grooves in a body, where all its components are appreciated.

Figure 2 shows a perspective view of the apparatus for forming internal grooves in a body.

For a better understanding of the invention, a detailed description of some of the modalities thereof will be shown, shown in the drawings which, for illustrative but non-limiting purposes, are attached to this description; as well as a list of the parts that make up the device to form internal grooves in a body: 1. Upper spacer

2. Intermediate spacer

3. Manga

4. Punch Bra

5. First universal spacer

6. Punch

7. External bra

8. Internal bra

9. Given

10. Centering

11. Second universal spacer

12. Lower spacer

13. Ejector

14. Third universal spacer

15. Punch ring

16. Bottom punch

17. Ejection stroke DETAILED DESCRIPTION OF THE INVENTION

Referring to Figures 1 and 2, the apparatus for forming internal grooves in a body is composed of:

An upper spacer (1) is located in the upper part of the apparatus to form internal grooves in a body, said upper spacer (1) is located on an intermediate spacer (2) so that together it is allowed to control the preload adjustment.

A sleeve (3) is placed under the intermediate fastener (2) and is configured to accommodate and control the sliding of a punch (6) that is responsible for forming the grooves when inserted into a centering (10) that has a stroke of ejection (17), placed under the punch (6), allowing it to pass through the body to which the groove will be formed. The ejection channel (17) has the minimum distance necessary to achieve ejection of the body to which the grooves will be made. The punch (6) is inside a punch holder (5) and under a first universal spacer (5) which makes it easier to adjust in relation to the centering (10).

The centering device (10) is connected to a die (9) that provides support to the part in the calibration process by means of at least two fasteners, an external fastener (7) and an internal fastener (8) which is of larger diameter than the external one, which allows the centering (10) to be held together with the die (9) providing support to the part in the calibration process; in the lower part within the die (9), the apparatus for forming internal grooves in a body has a second universal spacer (11) and a third universal spacer (14), on which a lower punch (16) is placed which is inside a punch ring (15), which serves as a guide for the lower punch (16), during the ejection phase. A lower spacer (12) configured to pass through it an ejector (13), is attached under the die (9); which when activated determines the distance of expulsion of the body to which grooves will be formed.

Claims

CLAIMS Having sufficiently described the invention, the content of the following claims clauses is claimed as property.

1. An apparatus for forming internal grooves in a body, characterized in that it comprises:

i. an upper spacer (1) is located in the upper part of the apparatus to form internal grooves in a body;

ii. an intermediate spacer (2), is located under the upper spacer (1);

iii. a sleeve (3) is placed under the intermediate fastener (2) and is configured to accommodate and control the sliding of a punch (6) is inside a punch fastener (5) and under a first universal spacer (5);

iv. which makes it easier to adjust in relation to the centering device (10).

v. a centering device (10) having an ejection stroke (17), is placed under the punch (6);

saw. a die (9) is attached to the centering device (10) by means of at least two fasteners, an external fastener (7) and an internal fastener (8);

vii. a second universal spacer (11) and a third universal spacer (14) are at the bottom inside the die (9);

viii a lower punch (16) that is inside a punch ring (15) is placed on the second universal spacer (11); Y,

ix. a lower spacer (12) configured to pass through it an ejector (13), is attached below the die (9).

2. The apparatus of the preceding claim, wherein the ejection channel (17) has the minimum distance necessary to achieve ejection of the body to which the grooves will be made.

3. The apparatus of claim 1, wherein the inner fastener (8) is larger in diameter than the outer fastener (7).